COUNCIL DIRECTIVE of 26 June 1991 amending Directive 70/220/EEC on the approximation of the laws of the Member States relating to measures to be taken against air pollution by emissions from motor vehicles (91/441/EEC)

THE COUNCIL OF THE EUROPEAN COMMUNITIES,

Having regard to the Treaty establishing the European Economic Community, and in particular Article 100a thereof,

Having regard to the proposal from the Commission (1),

In cooperation with the European Parliament (2),

Having regard to the opinion of the Economic and Social Committee (3),

Whereas it is important to adopt measures with the aim of progressively establishing the internal market over a period expiring on 31 December 1992 ; whereas the internal market shall comprise an area without internal frontiers in which the free movement of goods, persons, services and capital is ensured;

Whereas the first programme of action of the European Communities on the protection of the environment, approved by the Council on 22 November 1973, called for account to be taken of the latest scientific advances in combating atmospheric pollution caused by gases emitted from motor vehicles and for Directives adopted previously to be amended accordingly;

Whereas the third programme of action provides for additional efforts to be made to reduce considerably the present level of emissions of pollutants from motor vehicles;

Whereas Directive 70/220/EEC (4), as last amended by Directive 89/491/EEC (5), lays down the limit values for carbon monoxide and unburnt hydrocarbon emissions from the engines of such vehicles ; whereas these limit values were first reduced by Directive 74/290/EEC (6) and supplemented, in accordance with Directive 77/102/EEC (7), by limit values for permissible emissions of nitrogen oxides ; whereas the limit values for these three pollutions were successively reduced by Directives 78/665/EEC (8), 83/351/EEC (9) and 88/76/EEC (10), limit values for particulate pollutant emissions from diesel engines were introduced by Directive 88/436/EEC (11) and more stringent European standards for cars below 1 400 cm3 by Directive 89/458/EEC (12);

Whereas the work undertaken by the Commission in that sphere has shown that the Community has available, or is currently perfecting, technologies which allow a drastic reduction of the limit values in question for all engine sizes;

Whereas, since more stringent emission standards have been laid down by Directive 89/458/EEC for cars below 1 400 cm3, it is now necessary, in accordance with Article 5 of this Directive, to align the limit values for the emissions of cars with an engine capacity equal to or more than 1 400 cm3 to these standards at the same application dates and on the basis of an improved European test procedure including an extra-urban driving sequence;

Whereas it appears appropriate at the same time to lay down requirements relating to the evaporative (1) OJ No C 81, 30.3.1990, p. 1 and OJ No C 281, 9.11.1990, p. 9. (2) OJ No C 260, 15.10.1990, p. 93 and OJ No C 183, 15.7.1991. (3) OJ No C 225, 19.9.1990, p. 7. (4) OJ No L 76, 6.4.1970, p. 1. (5) OJ No L 238, 15.8.1989, p. 43. (6) OJ No L 159, 15.6.1974, p. 61. (7) OJ No L 32, 3.2.1977, p. 32. (8) OJ No L 223, 14.8.1978, p. 48. (9) OJ No L 197, 20.7.1983, p. 1. (10) OJ No L 36, 9.2.1988, p. 1. (11) OJ No L 214, 6.8.1988, p. 1. (12) OJ No L 226, 3.8.1989, p. 1. emissions and to the durability of emission-related vehicle components and to introduce, in accordance with Article 4 of Directive 88/436/EEC, the second stage of the standards for particulate pollutant emissions for cars equipped with diesel engines, thus consolidating the requirements of the European Community relating to the emissions of air pollutants from passenger cars ; whereas the durability test should be based on 80 000 kilometres driven and should be carried out using a procedure involving vehicles which are actually driven on a test track or chassis dynamometer;

Whereas in order to allow the European environment to benefit to the maximum from these provisions and at the same time ensure the unity of the market, it appears necessary to implement the more stringent European standards based on total harmonization;

Whereas the new standards and the test procedure should be laid down in the light of future developments in traffic in the European Community ; whereas completion of the internal market is likely to lead to an increase in vehicle registrations, which will result in an increase in pollutant emissions;

Whereas in view of the major role played by pollutant emissions from motor vehicles and their contribution to the gases responsible for the greenhouse effect, their emissions of CO2 in particular must be stabilized and subsequently reduced in line with the decision of the Governing Council of the United Nations Environment Programme (UNEP) of 24 May 1989, and in particular point 11 (d) thereof;

Whereas the Commission shall submit a proposal for a Directive on the measures to reduce evaporation losses at every stage in the process of storage and distribution of motor fuels;

Whereas there is also an urgent need to improve significantly the quality of fuel at filling stations;

Whereas the introduction of tougher standards would also be speeded up if the Member States introduced a system to encourage purchasers of new vehicles to have their old vehicles scrapped or, as fas as possible, recycled;

Whereas it is desirable that the Member States take measures to ensure that, as far as possible, older vehicles are fitted with exhaust gas cleaning devices;

Whereas the environmental impact of the more stringent standards would be greatly increased and speeded up if the Member States were to grant, after 31 December 1992, tax incentives for the purchase and installation on vehicles already in service of equipment which will ensure that the standards set out in this Directive are complied with;

Whereas the constant increase in environmental pollution caused by the rapid increase in traffic in the Community necessitates not only the adoption of limit values and tougher standards but also the development of alternative propulsion systems and transport concepts ; whereas the Community should take steps to provide financial support for research and development for alternative transport concepts, propulsion systems and fuels taking into account the requirements of environmental compatibility;

Whereas, therefore, in order to maximize the impact of the standards set out in this Directive, the Council, acting by a qualified majority on a proposal from the Commission, shall decide before 31 December 1992 on measures designed to: - limit CO2 emissions,

- adapt the emission standards (and the related tests) for vehicles not covered by this Directive, including all commercial vehicles,

- lay down regular inspections and procedures for replacing, repairing or maintaining the equipment fitted in order to meet the values laid down,

- implement a research and development programme to encourage the marketing of clean vehicles and fuels.

HAS ADOPTED THIS DIRECTIVE:

Article 1

The Annexes to Directive 70/220/EEC are replaced by the Annexes to this Directive.

Article 2

1. From 1 January 1992 no Member State may, on grounds relating to air pollution by their emissions: - refuse to grant EEC type-approval, to issue the document referred to in the last indent of Article 10 (1) of Directive 70/156/EEC (1), as last amended by Directive 87/403/EEC (2), or to grant national type-approval for a type of motor vehicle,

or

- prohibit the initial entry into service of motor vehicles, (1) OJ No L 42, 23.2.1970, p. 1. (2) OJ No L 220, 8.8.1987, p. 44. if emissions from that type of motor vehicle or from such vehicles meet the provisions of Directive 70/220/EEC, as amended by this Directive.

2. From 1 July 1992, Member States: - may no longer grant EEC type-approval or issue the document provided for in the last indent of Article 10 (1) of Directive 70/156/EEC for a type of motor vehicle;

- shall refuse national type-approval for a type of motor vehicle,

the emissions from which do not meet the requirements of the Annexes to Directive 70/220/EEC, as amended by this Directive.

3. From 31 December 1992, Member States shall prohibit the initial entry into service of vehicles the emissions from which do not meet the requirements of the Annexes to Directive 70/220/EEC, as amended by this Directive.

Article 3

Member States may make provision for tax incentives for the vehicles covered by this Directive. Such incentives shall meet the provisions of the Treaty as well as the following conditions: - they shall apply to all domestic car production and to vehicles imported for marketing in a Member State and fitted with equipment allowing the European standards to be met in 1992 to be satisfied ahead of time,

- they shall cease upon the dates set in Article 2 (3) for the compulsory entry into force of the emission values for new vehicles,

- they shall be of a value, for each type of vehicle, substantially lower than the actual cost of the equipment fitted to meet the values set and of its fitting on the vehicle.

The Commission shall be informed of any plans to introduce or amend the tax incentives referred to in the first subparagraph in sufficient time to allow it to submit comments.

Article 4

The Council, acting under the conditions laid down in the Treaty, shall decide before 31 December 1993 on a proposal which the Commission, taking into account technical progress, will sumit before 31 December 1992 on a further reduction in limit values.

The reduced limit values shall not apply before 1 January 1996 for new type-approvals ; they may serve as a basis for tax incentives as from the adoption of the new Directive.

Article 5

Acting by a qualified majority on a proposal from the Commission, which will take account of the results of the work in progress on the greenhouse effect, the Council shall decide on measures designed to limit CO2 emissions from motor vehicles.

Article 6

The Commission shall confirm in an additional technical report at the beginning of 1991 the validity of the alternative European durability test (1), which shall be at least as stringent as the durability test defined in Annex VII and shall be more representative of driving conditions in Europe. Where necessary, the accelerated ageing test (1) may be amended on a proposal from the Commission, in accordance with the procedure of the Committee on Adaptation to Technical Progress, by the end of 1991.

Article 7

1. Member States shall bring into force the laws, regulations and administrative provisions necessary in order to comply with this Directive by 1 January 1992. They shall forthwith inform the Commission thereof.

2. When Member States adopt the measures referred to in paragraph 1, they shall contain a reference to this Directive or be accompanied by such reference on the occasion of their official publication. The methods of making such a reference shall be laid down by the Member States.

Article 8

This Directive is addressed to the Member States.

Done at Luxembourg, 26 June 1991.

For the Council

The President

R. STEICHEN (1) OJ No C 81, 30.3.1990 (Annex VII on pp. 98-101).

ANNEX I

SCOPE, DEFINITIONS, APPLICATION FOR EEC TYPE-APPROVAL, EEC TYPE-APPROVAL, REQUIREMENTS AND TESTS, EXTENSION OF EEC TYPE-APPROVAL, CONFORMITY OF PRODUCTION, TRANSITIONAL PROVISIONS

1. SCOPE

This Directive applies to the tailpipe emissions, evaporative emissions, emissions of crankcase gases and the durability of anti-pollution devices for all motor vehicles equipped with positive-ignition engines and to the tailpipe emissions and durability of anti-pollution devices from vehicles of categories M1 and N1 (1), equipped with compression-ignition engines covered by Article 1 of Directive 70/220/EEC in the version of Directive 83/351/EEC (2), with the exception of those vehicles of category N1 for which type-approval has been granted pursuant to Directive 88/77/EEC (3).

At the request of the manufacturers, type-approval pursuant to this Directive may be extended from M1 or N1 vehicles equipped with compression ignition engines which have already been type-approved, to M2 and N2 vehicles having a reference mass not exceeding 2 840 kg and meeting the conditions of section 6 of this Annex (extension of EEC type-approval).

2. DEFINITIONS

For the purposes of this Directive: 2.1. "Vehicle type" with regard to the tailpipe emissions from the engine, means a category of power-driven vehicles which do not differ in such essential respects as: 2.1.1. the equivalent inertia determined in relation to the reference mass as prescribed in section 5.1 of Annex III ; and

2.1.2. the engine and vehicle characteristics as defined in Annex II.

2.2. "Reference mass" means the mass of the vehicle in running order less the uniform mass of the driver of 75 kg and increased by a uniform mass of 100 kg. 2.2.1. "Mass of the vehicle in running order" means the mass defined in section 2.6 of Annex I to Directive 70/156/EEC.

2.3. "Maximum mass" means the mass defined in section 2.7 of Annex I to Directive 70/156/EEC.

2.4. "Gaseous pollutants" means the exhaust gas emissions of carbon monoxide, hydrocarbons (assuming a ratio of C1H1,85), and oxides of nitrogen, expressed in nitrogen dioxide (NO2) equivalent.

2.5. "Particulate pollutants" means components of the exhaust gas which are removed from the diluted exhaust gas at a maximum temperature of 325 K (52 °C) by means of the filters described in Annex III.

2.6. "Tailpipe emissions" means: - for positive-ignition engines, the emission of gaseous pollutants,

- for compression-ignition engines, the emission of gaseous and particulate pollutants.

2.7. "Evaporative emissions" means the hydrocarbon vapours lost from the fuel system of a motor vehicle other than those from tailpipe emissions. 2.7.1. "Tank breathing losses" are hydrocarbon emissions caused by temperature changes in the fuel tank (assuming a ratio of C1H2,33).

2.7.2. "Hot soak losses" are hydrocarbon emissions arising from the fuel system of a stationary vehicle after a period of driving (assuming a ratio of C1H2,20). (1) As defined in point 0.4 of Annex I to Directive 70/156/EEC (OJ No L 42, 23.2.1970, p. 1). (2) OJ No L 197, 20.7.1983, p. 1. (3) OJ No L 36, 9.2.1988, p. 33.

2.8. "Engine crankcase" means the spaces in, or external to, an engine which are connected to the oil sump by internal or external ducts through which gases and vapours can escape.

2.9. "Cold start device" means a device which temporarily enriches the air/fuel mixture of the engine thus assisting the engine to start.

2.10. "Starting aid" means a device which assists the engine to start without enrichment of the air/fuel mixture of the engine, e.g. glow plugs, modifications to the injection timing.

2.11. "Engine capacity" means: 2.11.1. for reciprocating piston engines, the nominal engine swept volume,

2.11.2. for rotary piston (Wankel) engines, double the nominal engine swept volume.

2.12. "Anti-pollution device" means those components of a vehicle that control and/or limit tailpipe and evaporative emissions.

3. APPLICATION FOR EEC TYPE-APPROVAL

3.1. The application for approval of a vehicle type with regard to tailpipe emissions, evaporative emissions and durability of antipollution devices is submitted by the vehicle manufacturer or by his authorized representative.

3.2. It is accompanied by the information required by Annex II, together with: 3.2.1. a description of the evaporative control system installed on the vehicle;

3.2.2. in the case of vehicles equipped with positive ignition engines, a statement of whether either 5.1.2.1 (restricted orifice) or 5.1.2.2 (marking) applies, and in the latter case, a description of the marking;

3.2.3. when appropriate, copies of other type approvals with the relevant data to enable extensions of approvals and establishment of deterioration factors.

3.3. For the tests described in Section 5 of this Annex a vehicle representative of the vehicle type to be approved must be submitted to the technical service responsible for the type-approval tests.

4. EEC TYPE-APPROVAL

4.1. A certificate conforming to the model given in Annex IX must be issued as the EEC type-approval certificate.

5. REQUIREMENTS AND TESTS

Note:

As an alternative to the requirements of this section, vehicle manufacturers whose world-wide annual production is less than 10 000 units may obtain type-approval on the basis of the corresponding technical requirements in: - the code of Federal Regulations, Title 40, Part 86, subparts A and B, applicable to 1987 model year light-duty vehicles, revised as of 1 July 1989 and published by the US Government Printing Office, or

- the "Master Document", in its final version dated 25 September 1987, prepared by the International meeting in Stockholm on Air Pollution by Motor Vehicles, entitled "Control of Air Pollution from Motor Vehicles - General Provisions for Emission Regulations for Light Motor Vehicles."

The type-approval authority must notify the Commission of the circumstances of each approval granted under this provision. 5.1. General 5.1.1. The components liable to effect tailpipe and evaporative emissions must be so designed, constructed and assembled as to enable the vehicle, in normal use, to comply with the requirements of this Directive, despite the vibration to which they may be subjected.

The technical measures taken by the manufacturer must be such as to ensure that the tailpipe and evaporative emissions are effectively limited, pursuant to this Directive, throughout the normal life of the vehicle and under normal conditions of use. For tailpipe emissions, these provisions are deemed to be met if the provisions of sections 5.3.1.4 and 7.1.1.1 are respectively complied with.

If an oxygen sensor is used in the catalytic converter system, steps must be taken to ensure that the stoichiometric air-fuel ratio (lambda) is maintained when a certain speed is reached or when accelerating.

However, temporary variations in this ratio are permissible if they also occur during the test defined in sections 5.3.1 and 7.1.1 respectively, or if these variations are necessary for safe driving and for the correct operation of the engine and of components which affect pollutant emissions or if these variations are necessary for cold starting.

5.1.2. A vehicle equipped with a positive-ignition engine must be designed to be capable of running on unleaded petrol as specified by Directive 85/210/EEC (1). 5.1.2.1. Subject to 5.1.2.2, the inlet orifice of the fuel tank must be so designed that it prevents the tank from being filled from a petrol pump delivery nozzle which has an external diameter of 23,6 mm or greater.

5.1.2.2. Section 5.1.2.1 does not apply to a vehicle in respect of which both of the following conditions are satisfied, that is to say: 5.1.2.2.1. that the vehicle is so designed and constructed that no device designed to control the emission of gaseous pollutants is adversely affected by leaded petrol, and

5.1.2.2.2. that the vehicle is conspicuously, legibly and indelibly marked with the symbol for unleaded petrol specified in ISO 2575-1982 in a position immediately visible to a person filling the fuel tank. Additional markings are permitted.

5.2. Application of tests

Figure 1.5.2 illustrates the routes for type-approval of a vehicle. 5.2.1. With the exception of vehicles referred to in 8.1, positive-ignition engined vehicles must be subject to the following tests: - type I (simulating the average tailpipe emissions after a cold start),

- type III (emissions of crankcase gases),

- type IV (evaporative emissions),

- type V (durability of anti-pollution devices).

5.2.2. Positive-ignition engined vehicles referred to in 8.1 must be subject to the following tests: - type I (simulating the average tailpipe emissions after a cold start),

- type II (carbon monoxide emission at idling speed),

- type III (emissions of crankcase gases).

5.2.3. With the exception of vehicles referred to in 8.1, compression-ignition engined vehicles must be subject to the following tests: - type I (simulating the average tailpipe emissions after a cold start),

- type V (durability of anti-pollution devices). (1) OJ No L 96, 3.4.1985, p. 25.

5.2.4. Compression-ignition engined vehicles referred to in 8.1 must be subject to the following test: - type I (simulating the average tailpipe emissions after a cold start - gaseous polluants only.)

5.3. Description of tests 5.3.1. Type I test (simulating the average tailpipe emissions after a cold start). 5.3.1.1. Figure I.5.3 illustrates the routes for type I test. This test must be carried out on all vehicles referred to in section 1, of a maximum mass not exceeding 3,5 tonnes.

5.3.1.2. The vehicle is placed on a chassis dynamometer equipped with a means of load and inertia simulation. 5.3.1.2.1. With the exception of vehicles referred to in 8.1, a test lasting a total of 19 minutes and 40 seconds, made up of two parts, One and Two, is performed without interruption. An unsampled period of not more than 20 seconds may, with the agreement of the manufacturer, be introduced between the end of Part One and the beginning of Part Two in order to facilitate adjustment of the test equipment.

5.3.1.2.2. Part One of the test is made up of four elementary urban cycles. Each elementary urban cycle comprises fifteen phases (idling, acceleration, steady speed, deceleration, etc.).

5.3.1.2.3. Part Two of the test is made up of one extra urban cycle. The extra urban cycle comprises 13 phases (idling, acceleration, steady speed, deceleration, etc.).

>PIC FILE= "T0048778"> 5.3.1.2.4. For the vehicles referred to in 8.1, a test comprising only four elementary urban cycles (Part One) is performed without interruption, lasting a total of 13 minutes.

5.3.1.2.5. During the test the exhaust gases are diluted and a proportional sample collected in one or more bags. The exhaust gases of the vehicle tested are diluted, sampled and analyzed, following the procedure described below, and the total volume of the diluted exhaust is measured. Not only the carbon monoxide, hydrocarbon and nitrogen oxide emissions, but also the particulate pollutant emissions from vehicles equipped with compression-ignition engines are recorded.

5.3.1.3. The test is carried out using the procedure described in Annex III. The methods used to collect and analyse the gases and to remove and weigh the particulates must be as prescribed.

5.3.1.4. Subject to the requirements of 5.3.1.4.2 and 5.3.1.5 the test must be repeated three times. Except for vehicles referred to in 8.1 for each test, the results are multiplied by the appropriate deterioration factors obtained from 5.3.5. The resulting masses of gaseous emissions and, in the case of vehicles equipped with compression-ignition engines, the mass of particulates obtained in each test must be less than the limits shown in the table below: >PIC FILE= "T0048779"> 5.3.1.4.1. Notwithstanding the requirements of 5.3.1.4, for each pollutant or combination of pollutants, one of the three resulting masses obtained may exceed, by not more than 10 %, the limit prescribed, provided the arithmetical mean of the three results is below the prescribed limit. Where the prescribed limits are exceeded for more than one pollutant it is immaterial whether this occurs in the same test or in different tests (1).

5.3.1.4.2. >PIC FILE= "T0048780">

5.3.1.5. The number of tests prescribed in 5.3.1.4 is reduced in the conditions hereinafter defined, where V1 is the result of the first test and V2 the result of the second test for each pollutant or for the combined emission of two pollutants subject to limitation. 5.3.1.5.1. Only one test is performed if the result obtained for each pollutant or for the combined emission of two >PIC FILE= "T0048781">

5.3.1.5.2. If the requirement of 5.3.1.5.1 is not satisfied, only two tests are performed if, for each pollutant or for the combined emission of two pollutants subject to limitation, the following requirements are met: >PIC FILE= "T0048782">

5.3.2. Type II test (carbon monoxide emission test at idling speed) 5.3.2.1. This test is carried out on all vehicles referred to in 8.1 powered by a positive-ignition engine.

5.3.2.2. When tested in accordance with Annex IV, the carbon monoxide content by volume of the exhaust gases emitted with the engine idling must not exceed 3,5 % at the setting used for the type I test and must not exceed 4,5 % within the range of adjustments specified in that Annex.

5.3.3. Type III test (verifying emissions of crankcase gases) 5.3.3.1. This test must be carried out on all vehicles referred to in section 1 except those having compression-ignition engines. (1) When one of the three results corresponding to each pollutant or combination exceeds the limit value prescribed in 5.3.1.4 by more than 10 %, the test may, for the vehicle concerned, be continued as specified in 5.3.1.4.2.

>PIC FILE= "T0048783"> 5.3.3.2. When tested in accordance with Annex V, the engine's crankcase ventilation system must not permit the emission of any of the crankcase gases into the atmosphere.

5.3.4. Type IV test (determination of evaporative emissions) 5.3.4.1. This test must be carried out on all vehicles referred to in section 1 except those vehicles having compression-ignition engines and those vehicles referred to in 8.1.

5.3.4.2. When tested in accordance with Annex VI, evaporative emissions shall be less than 2 g/test.

5.3.5. Type V test (durability of anti-pollution devices) 5.3.5.1. This test must be carried out on all vehicles referred to in section 1, with the exception of those vehicles referred to in 8.1. The test represents an ageing test of 80 000 kilometres driven in accordance with the programme described in Annex VII on a test track, on the road or on a chassis dynamometer.

5.3.5.2. Notwithstanding the requirement of 5.3.5.1 a manufacturer may choose to have the deterioration factors from the following table used as an alternative to testing to 5.3.5.1.1. >PIC FILE= "T0048784">

At the request of the manufacturer, the technical service may carry out the type I test before the type V test has been completed using the deterioration factors in the table above. On completion of the type V test, the technical service may then amend the type-approval results recorded in Annex IX by replacing the deterioration factors in the above table with those measured in the type V test.

5.3.5.3. Deterioration factors are determined using either procedure in 5.3.5.1 or using the values in the table in 5.3.5.2. The factors are used to establish compliance with the requirements of 5.3.1.4 and 7.1.1.1.

6. EXTENSION OF EEC TYPE-APPROVAL

6.1. Tailpipe emission related extensions (type I and type II tests). 6.1.1. Vehicle types of different reference masses

Approval granted to a vehicle type may under the following conditions be extended to vehicle types which differ from the type approved only in respect of their reference mass: 6.1.1.1. Vehicles other than those referred to in 8.1. 6.1.1.1.1. Approval may be extended only to vehicle types of a reference mass requiring the use of the next higher equivalent inertia or any lower equivalent inertia.

6.1.1.2. Vehicles referred to in 8.1. 6.1.1.2.1. Approval may be extended only to vehicle types of a reference mass requiring merely the use of the next higher or next lower equivalent inertia.

6.1.1.2.2. If the reference mass of the vehicle type for which extension of the approval is requested requires the use of a flywheel of equivalent inertia higher than that used for the vehicle type already approved, extension of the approval is granted.

6.1.1.2.3. If the reference mass of the vehicle type for which extension of the approval is requested requires the use of a flywheel of equivalent inertia lower than that used for the vehicle type already approved, extension of the approval is granted if the masses of the pollutants obtained from the vehicle already approved are within the limits prescribed for the vehicle for which extension of the approval is requested.

6.1.2. Vehicle types with different overall gear ratios

Approval granted to a vehicle type may under the following conditions be extended to vehicle types which differ from the type approved only in respect of their transmission ratios: 6.1.2.1. For each of the transmission ratios used in the type I test, it is necessary to determine the proportion, >PIC FILE= "T0048785">

where, at an engine speed of 1 000 rpm, V1 is the speed of the vehicle-type approved and V2 is the speed of the vehicle type for which extension of the approval is requested.

6.1.2.2. >PIC FILE= "T0048786">

6.1.2.3. >PIC FILE= "T0048787">

6.1.3. Vehicle types of different reference masses and different overall transmission ratios

Approval granted to a vehicle type may be extended to vehicle types differing from the approved type only in respect of their reference mass and their overall transmission ratios, provided that all the conditions prescribed in 6.1.1 and 6.1.2 are fulfilled.

6.1.4. Note:

When a vehicle type has been approved in accordance with 6.1.1 to 6.1.3, such approval may not be extended to other vehicle types.

6.2. Evaporative emissions (type IV test) 6.2.1. Approval granted to a vehicle type equipped with a control system for evaporative emissions may be extended under the following conditions: 6.2.1.1. The basic principle of fuel/air metering (e.g. single point injection, carburettor) must be the same.

6.2.1.2. The shape of the fuel tank and the material of the fuel tank and liquid fuel hoses must be identical. The worst-case family with regard to the cross-section and approximate hose length must be tested. Whether non-identical vapour/liquid separators are acceptable is decided by the technical service responsible for the type-approval tests. The fuel tank volume must be within a range of ± 10 %. The setting of the tank relief valve must be identical.

6.2.1.3. The method of storage of the fuel vapour must be identical, i.e. trap form and volume, storage medium, air cleaner (if used for evaporative emission control), etc.

6.2.1.4. The carburettor bowl fuel volume must be within a 10 millilitre range.

6.2.1.5. The method of purging of the stored vapour must be identical (e.g. air flow, start point or purge volume over driving cycle).

6.2.1.6. The method of sealing and venting of the fuel metering system must be identical.

6.2.2. Further notes: (i) different engine sizes are allowed;

(ii) different engine powers are allowed;

(iii) automatic and manual gearboxes, two and four wheel transmissions are allowed;

(iv) different body styles are allowed;

(v) different wheel and tyre sizes are allowed.

6.3. Durability of anti-pollution devices (type V test) 6.3.1. Approval granted to a vehicle type may be extended to different vehicle types, provided that the engine/pollution control system combination is identical to that of the vehicle already approved. To this end, those vehicle types whose parameters described below are identical or remain within the limit values prescribed are considered to belong to the same engine/pollution control system combination. 6.3.1.1. Engine: - number of cylinders,

- engine capacity (± 15 %),

- configuration of the cylinder block,

- number of valves,

- fuel system,

- type of cooling system,

- combustion process.

6.3.1.2. Pollution control system: - Catalytic converters:

- number of catalytic converters and elements,

- size and shape of catalytic convertors (volume ± 10 %),

- type of catalytic activity (oxidizing, three-way, ...),

- precious metal load (identical or higher),

- precious metal ratio (± 15 %),

- substrate (structure and material),

- cell density,

- type of casing for the catalytic converter(s),

- location of catalytic converters (position and dimension in the exhaust system, that does not produce a temperature variation of more than 50 K at the inlet of the catalytic converter).

- Air injection:

- with or without

- type (pulsair, air pumps, ...).

- EGR:

- with or without.

6.3.1.3. Inertia category : the inertia category immediately above and any equivalent inertia category below.

6.3.1.4. The durability test may be achieved by using a vehicle, the body style, gear box (automatic or manual) and size of the wheels or tyres of which are different from those of the vehicle type for which the type approval is sought.

7. CONFORMITY OF PRODUCTION

7.1. As a general rule, conformity of production with regard to limitation of tailpipe and evaporative emissions from the vehicle, is checked on the basis of the description in the type-approval certificate set out in Annex IX and, where necessary, of all or some of the tests of types I, II, III, and IV described in 5.2. 7.1.1. Conformity of the vehicle for a type I test shall be checked as follows: 7.1.1.1. A vehicle is taken from the series and subjected to the test described in 5.3.1. The deterioration factors are applied in the same way. However, the limits shown in 5.3.1.4 are replaced by the following: >PIC FILE= "T0048788">

7.1.1.2. If the vehicle taken from the series does not satisfy the requirements of 7.1.1.1, the manufacturer may ask for measurements to be performed on a sample of vehicles taken from the series and including the vehicle originally taken. The manufacturer determines the size, n, of the sample. Vehicles other than the vehicle originally taken are subjected to a single type I test. The result to be taken into consideration for the vehicle tested originally is the arithmetical mean of the results obtained from the three type I tests >PIC FILE= "T0048789">

and the standard deviation S (1) are then plotted for the carbon monoxide emissions, the combined hydrocarbon and nitrogen oxide emissions and the particulate emissions. Production models are then deemed to conform if the following condition is met: >PIC FILE= "T0048790">

7.1.2. In a type II or type III test carried out on a vehicle taken from the series, the conditions laid down in 5.3.2.2 and 5.3.3.2 must be complied with.

7.1.3. Notwithstanding the requirements of section 3.1.1 of Annex III, the technical service responsible for verifying the conformity of production may, with the consent of the manufacturer, carry out tests of types I, II, III and IV on vehicles which have been driven less than 3 000 kilometres.

7.1.4. When tested in accordance with Annex VI, the average evaporative emissions for all production vehicles of the type approved must be less than the limit value in 5.3.4.2.

7.1.5. For routine end-of-production-line testing, the holder of the approval may demonstrate compliance by sampling vehicles which meet the requirements in section 7 of Annex VI. (1) Standard deviation is >PIC FILE= "T0048791">

8. TRANSITIONAL PROVISIONS

8.1. For the type-approval and verification of conformity of: - vehicles other than those of category M1;

- passenger vehicles of category M1 designed to carry more than six occupants including the driver or whose maximum mass exceeds 2 500 kilograms;

- off-road vehicles as defined in Annex I to Directive 70/156/EEC as last amended by Directive 87/403/EEC (1),

the test must be the Part One test. The limit values shown in the tables in 5.3.1.4 (type-approval) and 7.1.1.1 (conformity check) are replaced by the following:

For vehicle type-approval: >PIC FILE= "T0048792">

For conformity of production checks: >PIC FILE= "T0048793">

8.2. The following provisions remain applicable until 31 December 1994 for vehicles newly put into service and type-approved before 1 July 1993: - the transitional provisions laid down in section 8.3 (with the exception of 8.3.1.3) of Annex I to Directive 70/220/EEC, as amended by Directive 88/436/EEC,

- the provisions laid down for category M1 vehicles other than those referred to in section 8.1 of this Annex, fitted with positive-ignition engines of a capacity of more than 2 litres, in Annex I to Directive 70/220/EEC as amended by Directive 88/76/EEC,

- the provisions laid down for vehicles with an engine capacity of less than 1,4 litres in Directive 70/220/EEC, as amended by Directive 89/458/EEC.

At the manufacturer's request, the tests carried out in accordance with these requirements may be type-approved instead of undergoing the test referred to in sections 5.3.1, 5.3.5 and 7.1.1 of Annex I to Directive 70/220/EEC, as amended by Directive 91/441/EEC.

8.3. Up to 1 July 1994 for type-approval and up to 31 December 1994 for the initial entry into service, the limit values for the combined mass of hydrocarbons and nitrogen oxides and for the mass of particulates of vehicles fitted with compression-ignition engines of the direct-injection type, with the exception of vehicles referred to in 8.1, are those obtained by multiplying the values L2 and L3 in the tables in 5.3.1.4 (type-approval) and 7.1.1.1 (conformity check) by a factor of 1.4. (1) OJ No L 220, 8.8.1987, p. 44.

ANNEX II

INFORMATION DOCUMENT No ... in accordance with Annex I of Council Directive 70/156/EEC relating to EEC type-approval and referring to measures to be taken against air pollution by emissions from motor vehicles (Directive 70/220/EEC as last amended by Directive 91/441/EEC) >PIC FILE= "T0048794">

>PIC FILE= "T0048795">

>PIC FILE= "T0048796">

>PIC FILE= "T0048797">

>PIC FILE= "T0048798">

>PIC FILE= "T0048799">

>PIC FILE= "T0048800">

ANNEX III

TYPE I TEST (Verifying the average emission of tailpipe emissions after a cold start)

1. INTRODUCTION

This Annex describes the procedure for the Type I test defined in 5.3.1 of Annex I.

2. OPERATING CYCLE ON THE CHASSIS DYNAMOMETER

2.1. Description of the cycle

The operating cycle on the chassis dynanometer is described in Appendix 1 to this Annex.

2.2. General conditions under which the cycle is carried out

Preliminary testing cycles must be carried out if necessary to determine how best to actuate the accelerator and brake controls so as to achieve a cycle approximating to the theoretical cycle within the prescribed limits.

2.3. Use of gearbox 2.3.1. If the maximum speed which can be attained in first gear is below 15 km/h, the second, third and fourth gears are used for the elementary urban cycles (Part One) and the second, third, fourth and fifth gears for the extra-urban cycle (Part Two). The second, third and fourth gears may also be used for the urban cycle (Part One) and the second, third, four and fifth gears for the extra-urban cycle (Part Two) when the driving instructions recommend starting in second gear on level ground, or when first gear is therein defined as a gear reserved for cross-country driving, crawling or towing.

For vehicles with a maximum engine power of no more than 30 kw and a maximum speed not exceeding 130 km/h, the maximum speed of the extra-urban cycle (Part Two) is limited to 90 km/h until 1 July 1994. After that date, vehicles which do not attain the acceleration and maximum speed values required in the operating cycle must be operated with the accelerator control fully depressed until they once again reach the required operating curve. Deviations from the operating cycle must be recorded in the test report.

2.3.2. Vehicles equipped with semi-automatic-gearboxes are tested by using the gears normally employed for driving, and the gear is used in accordance with the manufacturer's instructions.

2.3.3. Vehicles equipped with automatic gearboxes are tested with the highest gear (drive) engaged. The accelerator must be used in such a way as to obtain the steadiest acceleration possible, enabling the various gears to be engaged in the normal order. Furthermore, the gear-change points shown in Appendix 1 to this Annex do not apply ; acceleration must continue throughout the period represented by the straight line connecting the end of each period of idling with the beginning of the next following period of steady speed. The tolerances given in 2.4 apply.

2.3.4. Vehicles equipped with an overdrive which the driver can activate are tested with the overdrive out of action for the urban cycle (Part One) and with the overdrive in action for the extra-urban cycle (Part Two).

2.4. Tolerances 2.4.1. A tolerance of ± 2 km/h is allowed between the indicated speed and the theoretical speed during acceleration, during steady speed, and during deceleration when the vehicle's brakes are used. If the vehicle decelerates more rapidly without the use of the brakes, only the requirements of 6.5.3 apply. Speed tolerances greater than those prescribed are accepted during phase changes provided that the tolerances are never exceeded for more than 0,5 on any one occasion.

2.4.2. The time tolerances are ± 1,0 s. The above tolerances apply equally at the beginning and at the end of each gear changing period (1) for the urban cycle (Part One) and for the operations Nos 3, 5 and 7 of the extra-urban cycle (Part Two).

2.4.3. The speed and time tolerances are combined as indicated in Appendix 1.

3. VEHICLE AND FUEL

3.1. Test vehicle 3.1.1. The vehicle must be presented in good mechanical condition. It must have been run-in and driven at least 3 000 kilometres before the test.

3.1.2. The exhaust device must not exhibit any leak likely to reduce the quantity of gas collected, which quantity must be that emerging from the engine.

3.1.3. The tightness of the intake system may be checked to ensure that carburation is not affected by an accidental intake of air.

3.1.4. The settings of the engine and of the vehicle's controls must be those prescribed by the manufacturer. This requirement also applies, in particular, to the settings for idling (rotation speed and carbon monoxide content of the exhaust gases), for the cold start device and for the exhaust gas pollutant emission control system.

3.1.5. The vehicle to be tested, or an equivalent vehicle, must be fitted, if necessary, with a device to permit the measurement of the characteristic parameters necessary for chassis dynamometer setting, in conformity with 4.1.1.

3.1.6. The technical service may verify that the vehicle's performance conforms to that stated by the manufacturer, that it can be used for normal driving and, more particularly, that it is capable of starting when cold and when hot.

3.2. Fuel

The appropriate reference fuel as defined in Annex VIII must be used for testing.

4. TEST EQUIPMENT

4.1. Chassis dynamometer 4.1.1. The dynamometer must be capable of simulating road load within one of the following classifications: - dynamometer with fixed load curve, i.e. a dynamometer whose physical characteristics provide a fixed load curve shape,

- dynamometer with ajustable load curve, i.e. a dynamometer with at least two road load parameters that can be adjusted to shape the load curve.

4.1.2. The setting of the dynamometer must not be affected by the lapse of time. It must not produce any vibrations perceptible to the vehicle and likely to impair the vehicle's normal operations.

4.1.3. It must be equipped with means to simulate inertia and load. These simulators are connected to the front roller in the case of a two-roller dynamometer.

4.1.4. Accuracy 4.1.4.1. It must be possible to measure and read the indicated load to an accuracy of ± 5 %. (1) It should be noted that the time of two seconds allowed includes the time for changing gear and, if necessary, a certain amount of latitude to catch up with the cycle.

4.1.4.2. In the case of a dynamometer with a fixed load curve the accuracy of the load setting at 80 km/h must be ± 5 %. In the case of a dynamometer with an adjustable load curve, the accuracy of matching dynamometer load to road load must be 5 % at 100, 80, 60 and 40, and 10 % at 20 km/h. Below this, dynamometer absorption must be positive.

4.1.4.3. The total inertia of the rotating parts (including the simulated inertia where applicable) must be known and must be within ± 20 kilograms of the inertia class for the test.

4.1.4.4. The speed of the vehicle must be measured by the speed of rotation of the roller (the front roller in the case of a two roller dynamometer). It must be measured with an accuracy of ± 1 km/h at speeds above 10 km/h.

4.1.5. Load and inertia setting 4.1.5.1. Dynamometer with fixed load curve : the load simulator must be adjusted to absorb the power exerted on the driving wheels at a steady speed of 80 km/h and the absorbed power at 50 km/h shall be noted. The means by which this load is determined and set are described in Appendix 3.

4.1.5.2. Dynamometer with adjustable load curve : the load simulator must be adjusted in order to absorb the power exerted on the driving wheels at steady speeds of 100, 80, 60, 40 and 20 km/h. The means by which these loads are determined and set are described in Appendix 3.

4.1.5.3. Inertia

Dynamometers with electrical inertia simulation must be demonstrated to be equivalent to mechanical inertia systems. The means by which equivalence is established is described in Appendix 4.

4.2. Exhaust-gas sampling system 4.2.1. The exhaust gas sampling system must be able to measure the actual quantities of pollutants emitted in the exhaust gases to be measured. The system to be used is the constant volume sampler (CVS) system. This requires that the vehicle exhaust be continuously diluted with ambient air under controlled conditions. In the constant volume sampler concept of measuring two conditions must be satisfied : the total volume of the mixture of exhaust gases and dilution air must be measured and a continuously proportional sample of the volume must be collected for analysis.

The quantities of pollutants emitted are determined from the sample concentrations, corrected for the pollutant content of the ambient air and the totalized flow over the test period.

The particulate pollutant emission level is determined by using suitable filters to collect the particulates from a proportional part flow throughout the test and determining the quantity thereof gravimetrically in accordance with 4.3.2.

4.2.2. The flow through the system must be sufficient to eliminate water condensation at all conditions which may occur during a test, as defined in Appendix 5.

4.2.3. Figure III.4.2.3 gives a schematic diagram of the general concept. Appendix 5 gives examples of three types of constant volume sampler system which satisfy the requirements set out in this Annex.

4.2.4. The gas and air mixture must be homogeneous at point S2 of the sampling probe.

4.2.5. The probe must extract a true sample of the diluted exhaust gases.

4.2.6. The system must be free of gas leaks. The design and materials must be such that the system does not influence the pollutant concentration in the diluted exhaust gas. Should any component (heat exchanger, blower, etc.) change the concentration of any pollutant gas in the diluted gas, the sampling for that pollutant must be carried out before that component if the problem cannot be corrected.

>PIC FILE= "T0048801">

4.2.7. If the vehicle being tested is equipped with an exhaust pipe comprising several branches, the connecting tubes must be connected as near as possible to the vehicle.

4.2.8. Static pressure variations at the tailpipe(s) of the vehicle must remain within ± 1,25 kPa of the static pressure variations measured during the dynamometer driving cycle with no connection to the tailpipe(s). Sampling systems capable of maintaining the static pressure to within ± 0,25 kPa are used if a written request from a manufacturer to the competent authority issuing the approval substantiates the need for the narrower tolerance. The back-pressure must be measured in the exhaust pipe, as near as possible to its end or in an extension having the same diameter.

4.2.9. The various valves used to direct the exhaust gases must be of a quick-adjustment, quick-acting type.

4.2.10. The gas samples are collected in sample bags of adequate capacity. These bags must be made of such materials as will not change the pollutant gas by more than ± 2 % after 20 minutes of storage.

4.3. Analytical equipment 4.3.1. Requirements 4.3.1.1. Pollutant gases must be analyzed with the following instruments:

Carbon monoxide (CO) and carbon dioxide (CO2) analysis:

The carbon monoxide and carbon dioxide analysers must be of the non-dispersive infra-red (NDIR) absorption type.

Hydrocarbons (HC) analysis - spark-ignition engines:

The hydrocarbons analyser must be of the flame ionization (FID) type calibrated with propane gas expressed equivalent to carbon atoms (C1).

Hydrocarbons (HC) analysis - compression-ignition engines:

The hydrocarbons analyser must be of the flame ionization type with detector, valves, pipework, etc, heated to 463 K (190 °C) ± 10 K (HFID). It must be calibrated with propane gas expressed equivalent to carbon atoms (C1).

Nitrogen oxide (NOx) analysis:

The nitrogen oxide analyser must be either of the chemiluminescent (CLA) or of the non-dispensive ultraviolet resonance absorption (NDUVR) type, both with an NOx - NO converter.

Particulates:

Gravimetric determination of the particulates collected. These particulates are in each case collected by two series-mounted filters in the sample gas flow. The quantity of particulates collected by each pair of filters must be as follows: >PIC FILE= "T0048802">

The filter surface consist of a material that is hydrophobic and inert towards the components of the exhaust gas (fluorocarbon-coated glass-fibre filters or equivalent).

4.3.1.2. Accuracy

The analysers must have a measuring range compatible with the accuracy required to measure the concentrations of the exhaust-gas sample pollutants.

Measurement error must not exceed ± 3 %, disregarding the true value for the calibration gases.

For concentrations of less than 100 ppm the measurement error must not exceed ± 3 ppm. The ambient air sample must be measured on the same analyser and range as the corresponding diluted exhaust sample. Measurement of the particulates collected shall be to a guaranteed accuracy of 1 ¶g.

The microgram balance used to determine the weight of all filters must have a precision (standard deviation) and readability of 1 ¶g.

4.3.1.3. Ice-trap

No gas drying device must be used before the analysers unless shown to have no effect on the pollutant content of the gas stream.

4.3.2. Particular requirements for compression-ignition engines

A heated sample line for a continuous HC-analysis with the flame ionization detector (HFID), including recorder (R) must be used. The average concentration of the measured hydrocarbons must be determined by integration. Throughout the test, the temperature of the heated sample line must be controlled at 463 K >PIC FILE= "T0048803">

The HFID must be used with a constant flow (heat exchanger) system to ensure a representative sample, unless compensation for varying CFV or CFO flows is made.

The particulate sampling unit consists of a dilution tunnel, a sampling probe, a filter unit, a partial-flow pump, and a flow rate regulator and measuring unit. The particulate-sampling part flow is drawn through two series-mounted filters. The sampling probe for the test gas flow for particulates must be so arranged within the dilution tract that a representative sample gas flow can be taken from the homogeneous air/exhaust mixture and an air/exhaust gas mixture temperature of 325 K (52 °C) is not exceeded at the sampling point. The temperature of the gas flow in the flow meter may not fluctuate more than ± 3 K, nor may the mass flow-rate fluctuate by more than ± 5 %. Should the volume of flow change unacceptably as a result of excessive filter loading, the test must be stopped. When it is repeated, the rate of flow must be decreased and/or a larger filter used. The filters must be removed from the chamber no earlier than an hour before the test begins.

The necessary particle filters must be conditioned (as regards temperature and humidity) in an open dish which has been protected against dust ingress for at least eight and for not more than 56 hours before the test in an air-conditioned chamber. After this conditioning the uncontaminated filters are weighed and stored until they are used.

If the filters are not used within one hour of their removal from the weighing chamber they must be reweighed.

The one-hour limit may be replaced by an eight-hour limit if one or both of the following conditions are met: - a stabilized filter is placed and kept in a sealed filter holder assembly with the ends plugged, or

- a stabilized filter is placed in a sealed filter holder assembly which is then immediatly placed in a sample line through which there is no flow.

4.3.3. Calibration

Each analyser must be calibrated as often as necessary and in any case in the month before type-approval testing and at least once every six months for verifying conformity of production. The calibration method to be used is described in Appendix 6 for the analysers referred to in 4.3.1.

4.4. Volume measurement 4.4.1. The method of measuring total dilute exhaust volume incorporated in the constant volume sampler must be such that measurement is accurate to ± 2 %.

4.4.2. Constant volume sampler calibration

The constant volume sampler system volume measurement device must be calibrated by a method sufficient to ensure the prescribed accuracy and at a frequency sufficient to maintain such accuracy.

An example of a calibration procedure which gives the required accuracy is given in Appendix 6. The method utilizes a flow metering device which is dynamic and suitable for the high flow-rate encountered in constant volume sampler testing. The device must be of certified accuracy in conformity with an approved national or international standard.

4.5. Gases 4.5.1. Pure gases

The following pure gases must be available, if necessary, for calibration and operation: >PIC FILE= "T0048804">

4.5.2. Calibration gases

Gases having the following chemical compositions must be available : mixtures of: - C3H8 and purified synthetic air (4.5.1),

- CO and purified nitrogen,

- CO2 and purified nitrogen,

- NO and purified nitrogen.

(The amount of NO2 contained in this calibration gas must not exceed 5 % of the NO content).

The true concentration of a calibration gas must be within ± 2 % of the stated figure.

The concentrations specified in Appendix 6 may also be obtained by means of a gas divider, diluting with purified N2 or with purified synthetic air. The accuracy of the mixing device must be such that the concentrations of the diluted calibration gases may be determined to within ± 2 %.

4.6. Additional equipment 4.6.1. Temperatures

The temperatures indicated in Appendix 8 are measured with an accuracy of ± 1,5 K.

4.6.2. Pressure

The atmospheric pressure must be measurable to within ± 0,1 kPa.

4.6.3. Absolute humidity

The absolute humidity (H) must be measurable to within ± 5 %.

4.7. The exhaust gas-sampling system must be verified by the method described in section 3 of Appendix 7. The maximum permissible deviation between the quantity of gas introduced and the quantity of gas measured is 5 %.

5. PREPARING THE TEST

5.1. Adjustment of inertia simulators to the vehicle's translatory inertia

An inertia simulator is used enabling a total inertia of the rotating masses to be obtained proportional to the reference mass within the following limits: >PIC FILE= "T0048805">

5.2. Setting of dynamometer

The load is adjusted according to methods described in 4.1.4.

The method used and the values obtained (equivalent inertia - characteristic adjustment parameter) must be recorded in the test report.

5.3. Preconditioning of the vehicle 5.3.1. For compression-ignition engine vehicles for the purpose of measuring particulates at most 36 hours and at least six hours before testing, the Part Two cycle described in Appendix 1 must be used. Three consecutive cycles must be driven. The dynamometer setting is as indicated in 5.1 and 5.2.

After this preconditioning specific for compression ignition engines and before testing, compression-ignition arid positive ignition engine vehicles must be kept in a room in which the temperature remains relatively constant between 293 and 303 K (20 and 30 °C). This conditioning must be carried out for at least six hours and continue until the engine oil temperature and coolant, if any, are within ± 2 K of the temperature of the room.

If the manufacturer so requests, the test must be carried out not later than 30 hours after the vehicle has been run at its normal temperature.

5.3.2. The tyre pressures must be the same as that specified by the manufacturer and used for the preliminary road test for brake adjustment. The tyre pressures may be increased by up to 50 % from the manufacturer's recommended setting in the case of a two-roller dynamometer. The actual pressure used must be recorded in the test report.

6. PROCEDURE FOR BENCH TESTS

6.1. Special conditions for carrying out the cycle 6.1.1. During the test, the test cell temperature must be between 293 and 303 K (20 and 30 °C). The absolute humidity (H) of either the air in the test cell or the intake air of the engine must be such that: >PIC FILE= "T0048806">

6.1.2. The vehicle must be approximately horizontal during the test so as to avoid any abnormal distribution of the fuel.

6.1.3. The test must be carried out with the bonnet raised unless this is technically impossible. An auxiliary ventilating device acting on the radiator (water-cooling) or on the air intake (air-cooling) may be used if necessary to keep the engine temperature normal.

6.1.4. During the test the speed is recorded against time so that the correctness of the cycles performed can be assessed.

6.2. Starting-up the engine 6.2.1. The engine must be started up by means of the devices provided for this purpose according to the manufacturer's instructions, as incorporated in the driver's handbook of production vehicles.

6.2.2. The engine must be kept idling for a period of 40 seconds. The first cycle must begin at the end of the aforesald period of 40 seconds at idle.

6.3. Idling 6.3.1. Manual-shift or semi-automatic gearbox 6.3.1.1. During periods of idling the clutch must be engaged and the gears in neutral.

6.3.1.2. To enable the accelerations to be performed according to the normal cycle the vehicle must be placed in first gear, with the clutch disengaged, five seconds before the acceleration following the idling period considered of the elementary urban cycle (Part One).

6.3.1.3. The first idling period at the beginning of the urban cycle (Part One) consists of six seconds of idling in neutral with the clutch engaged and five seconds in first gear with the clutch disengaged.

The two idling periods referred to above must be consecutive

The idling period at the beginning of the extra-urban cycle (Part Two) consists of twenty seconds of idling in first gear with the clutch disengaged.

6.3.1.4. For the idling periods during each urban cycle (Part One) the corresponding times are 16 seconds in neutral and five seconds in first gear with the clutch disengaged.

6.3.1.5. The idling period between two successive elementary urban cycles (Part One) comprises 13 seconds in neutral with the clutch engaged.

6.3.1.6. At the end of the deceleration period (halt of the vehicle on the rollers) of the extra-urban cycle (Part Two), the idling period consists of twenty seconds in neutral with the clutch engaged.

6.3.2. Automatic-shift gearbox

After initial engagement the selector must not be operated at any time during the test except as in the case specified in 6.4.3 or if the selector can actuate the overdrive, if any.

6.4. Accelerations 6.4.1. Accelerations must be so performed that the rate of acceleration is as constant as possible throughout the phase.

6.4.2. If an acceleration cannot be carried out in the prescribed time, the extra time required is, if possible, deducted from the time allowed for changing gear, but otherwise from the subsequent steady-speed period.

6.4.3. Automatic-shift gearboxes

If an acceleration cannot be carried out in the prescribed time, the gear selector is operated in accordance with requirements for manual-shift gearboxes,

6.5. Deceleration 6.5.1. All decelerations of the elementary urban cycle (Part One) are effected by removing the foot completely from the accelerator, the clutch remaining engaged. The clutch is disengaged, without use of the gear lever, at a speed of 10 km/h.

All the decelerations of the extra-urban cycle (Part Two) are effected by removing the foot completely from the accelerator, the clutch remaining engaged. The clutch is disengaged, without use of the gear lever, at a speed of 50 km/h for the last deceleration.

6.5.2. If the period of deceleration is longer than that prescribed for the corresponding phase, the vehicle's brakes are used to enable the timing of the cycle to be complied with.

6.5.3. If the period of deceleration is shorter than that prescribed for the corresponding phase, the timing of the theoretical cycle is restored by constant speed or idling period merging into the following operation.

6.5.4. At the end of the deceleration period (halt of the vehicle on the rollers) of the elementary urban cycle (Part One) the gears are placed in neutral and the clutch engaged.

6.6. Steady speeds 6.6.1. Pumping or the closing of the throttle must be avoided when passing from acceleration to the following steady speed.

6.6.2. Periods of constant speed are achieved by keeping the accelerator position fixed.

7. GAS AND PARTICULATE SAMPLING AND ANALYSIS

7.1. Sampling

Sampling begins at the beginning of the first elementary urban cycle as defined in 6.2.2 and ends on conclusion of the final idling period in the extra-urban cycle (Part Two) or of the final idling period of the last elementary urban cycle (Part One) depending on the type of test carried out.

7.2. Analysis 7.2.1. The exhaust gases contained in the bag must be analysed as soon as possible and in any event not later than 20 minutes after the end of the test cycle. The spent particulate filters must be taken to the chamber no later than one hour after conclusion of the test on the exhaust gases and must there be conditioned for between two and 36 hours and then be weighed.

7.2.2. Prior to each sample analysis the analyser range to be used for each pollutant must be set to zero with the appropriate zero gas.

7.2.3. The analysers are then set to the calibration curves by means of span gases of nominal concentrations of 70 to 100 % of the range.

7.2.4. The analysers' zeros are then rechecked. If the reading differs by more than 2 % of range from that set in 7.2.2. the procedure is repeated.

7.2.5. The samples are then analyzed.

7.2.6. After the analysis, zero and span points are rechecked using the same gases. If these rechecks are within 2 % of those in 7.2.3, the analysis is considered acceptable.

7.2.7. At all points in this section the flow-rates and pressures of the various gases must be the same as those used during calibration of the analysers.

7.2.8. The figure adopted for the concentration of each polluant measured in the gases is that read off after stabilization on the measuring device. Hydrocarbon mass emissions of compression-ignition engines are calculated from the integrated HFID reading, corrected for varying flow if necessary as shown in Appendix 5.

8. DETERMINATION OF THE QUANTITY OF GASEOUS AND PARTICULATE POLLUTANTS EMITTED

8.1. The volume considered

The volume to be considered must be corrected to conform to the conditions of 101,33 kPa and 273,2 K.

8.2. Total mass of gaseous and particulate pollutants emitted

The mass m of each gaseous pollutant emitted by the vehicle during the test is determined by obtaining the product of the volumetric concentration and the volume of the gas in question, with due regard to the following densities under the abovementioned reference conditions: - in the case of carbon monoxide (CO) : d = 1,25 g/l,

- in the case of hydrocarbons (CH1,85) : d = 0,619 g/l,

- in the case of nitrogen oxides (NO2) : d = 2,05 g/l.

The mass m of particulate pollutant emissions from the vehicle during the test is defined by weighing the mass of particulates collected by the two filters, m1 by the first filter, m2 by the second filter:

- >PIC FILE= "T0048807">

- if 0,95 (m1 + m2) > m1, m = m1 + m2,

- if m2 > m1, the test is cancelled.

Appendix 8 gives the calculations, followed by examples, used in determining the mass emissions of gaseous and particulate pollutants.

Appendix 1 BREAKDOWN OF THE OPERATING CYCLE USED FOR THE TYPE I TEST

1. OPERATING CYCLE

1.1. The operating cycle, made up of a Part One (urban cycle) and Part Two (extra-urban cycle), is illustrated at Figure III.1.1.

2. ELEMENTARY URBAN CYCLE (PART ONE) See Figure III.1.2 and Table III.1.2.

2.1. Breakdown by phases >PIC FILE= "T0048808">

2.2. Breakdown by use of gears >PIC FILE= "T0048809">

2.3. General information

Average speed during test : 19 km/h. Effective running time : 195 seconds. Theoretical distance covered per cycle : 1,013 km. Equivalent distance for the four cycles : 4,052 km.

>PIC FILE= "T0048810">

>PIC FILE= "T0048811">

>PIC FILE= "T0048812">

3. EXTRA - URBAN CYCLE (Part Two) See Figure III.1.3 and Table III.1.3

3.1. Breakdown by phases >PIC FILE= "T0048813">

3.2. Breakdown by use of gears >PIC FILE= "T0048814">

3.3. General information

Average speed during test : 62,6 km/h. Effective running time : 400 seconds. Theoretical distance covered per cycle : 6,955 km. Maximal speed : 120 km/h. Maximal acceleration : 0,833 m/s2. Maximal deceleration : - 1,389 m/s2.

>PIC FILE= "T0048815">

>PIC FILE= "T0048816">

4. EXTRA - URBAN CYCLE (LOW-POWERED VEHICLES) See Figure III.1.4 and Table III.1.4

4.1. Breakdown by phases >PIC FILE= "T0048817">

4.2. Breakdown by use of gears >PIC FILE= "T0048818">

4.3. General information

Average speed during test : 59,3 km/h. Effective running time : 400 seconds. Theoretical distance covered per cycle : 6,594 km. Maximal speed : 90 km/h. Maximal acceleration : 0,833 m/s2. Maximal deceleration : -1,389 m/s2.

>PIC FILE= "T0048819">

>PIC FILE= "T0048820">

Appendix 2 CHASSIS DYNAMOMETER

1. DEFINITION OF A CHASSIS DYNAMOMETER WITH FIXED LOAD CURVE

1.1. Introduction

In the event that the total resistance to progress on the road is not reproduced on the chassis dynamometer between speeds of 10 and 100 km/h, it is recommended to use a chassis dynamometer having the characteristics defined below.

1.2. Definition 1.2.1. The chassis dynamometer may have one or two rollers.

The front roller drives, directly or indirectly, the inertia masses and the power absorption device.

1.2.2. Once the load at 80 km/h has been set by one of the methods described in section, K can be determined from P = KV3.

The power absorbed (Pa) by the brake and the chassis internal frictional effects from the reference setting to a vehicle speed of 80 km/h, are as follows:

If V > 12 km/h:

Pa = KV3 ± 5 % KV3 ± 5 % PV80

(without being negative). >PIC FILE= "T0048821">

Pa will be between O and Pa = KV312 ± 5 % PV312 ± 5 % PV80 where K is a characteristic of the chassis dynamometer and PV80 is the power absorbed at 80 km/h.

2. METHOD OF CALIBRATING THE DYNAMOMETER

2.1. Introduction

This Appendix describes the method to be used to determine the power absorbed by a dynamometric brake.

The power absorbed comprises the power absorbed by frictional effects and the power absorbed by the power-absorption device. The dynamometer is brought into operation beyond the range of test speeds. The device used for starting up the dynamometer is then disconnected : the rotational speed of the driven roller decreases.

The kinetic energy of rollers is dissipated by the power-absorption unit and by the frictional effects. This method disregards variations in the roller's internal frictional effects caused by rollers with or without the vehicle. The frictional effects of the rear roller shall be disregarded when this is free.

2.2. Calibrating the power indicator to 80 km/h as a function of the power absorbed

The following procedure is used (see also Figure III.2.2.2). 2.2.1. Measure the rotational speed of the roller if this has not already been done. A fifth wheel, a revolution counter or some other method may be used.

2.2.2. Place the vehicle on the dynamometer or devise some other method of starting up the dynamometer.

2.2.3. Use the fly-wheel or any other system of inertia simulation for the particular inertia class to be used. >PIC FILE= "T0048822">

2.2.4. Bring the dynamometer to a speed of 80 km/h.

2.2.5. Note the power indicated (P1).

2.2.6. Bring the dynamometer to a speed of 90 km/h.

2.2.7. Disconnect the device used to start up the dynamometer.

2.2.8. Note the time taken by the dynamometer to pass from a speed of 85 km/h to a speed of 75 km/h.

2.2.9. Set the power-absorption device at a different level.

2.2.10. The requirements of 2.2.4 to 2.2.9 must be repeated sufficiently often to cover the range of road powers used.

2.2.11. Calculate the power absorbed, using the formula: >PIC FILE= "T0048823">

>PIC FILE= "T0048824">

2.2.12. Figure III.2.2.2.12 shows the power indicated at 80 km/h in terms of the power absorbed at 80 km/h.

>PIC FILE= "T0048825"> 2.2.13. The operation described in 2.2.3 to 2.2.12 must be repeated for all inertia classes to be used.

2.3. Calibration of the power indicator as a function of the absorbed power for other speeds

The procedures described in 2.2 must be repeated as often as necessary for the chosen speeds.

2.4. Verification of the power-absorption curve of the dynamometer from a reference setting at a speed of 80 km/h 2.4.1. Place the vehicle on the dynamometer or devise some other method of starting up the dynamometer.

2.4.2. Adjust the dynamometer to the absorbed power (Pa) at 80 km/h.

2.4.3. Note the power absorbed at 100, 80, 60, 40 and 20 km/h.

2.4.4. Draw the curve Pa(V) and verify that it corresponds to the requirements of 1.2.2.

2.4.5. Repeat the procedure set out in 2.4.1 to 2.4.4 for other values of power Pa at 80 km/h and for other values of inertia.

2.5. The same procedure must be used for force or torque calibration.

3. SETTING OF THE DYNAMOMETER

3.1. Vacuum method 3.1.1. Introduction

This method is not a preferred method and must be used only with fixed load curve shape dynamometers for determination of load setting at 80 km/h and cannot be used for vehicles with compression-ignition engines.

3.1.2. Test instrumentation

The vacuum (or absolute pressure) in the intake manifold vehicle is measured to an accuracy of ± 0,25 kPa. It must be possible to record this reading continuously or at intervals of no more than one second. The speed must be recorded continuously with a precision of ± 0,4 km/h.

3.1.3. Road test 3.1.3.1. Ensure that the requirements of section 4 of Appendix 3 are met.

3.1.3.2. Drive the vehicle at a steady speed of 80 km/h recording speed and vacuum (or absolute pressure) in accordance with the requirements of 3.1.2.

3.1.3.3. Repeat procedure set out in 3.1.3.2 three times in each direction. All six runs must be completed within four hours.

3.1.4. Data reduction and acceptance criteria 3.1.4.1. Review results obtained in accordance with 3.1.3.2 and 3.1.3.3 (speed must not be lower than 79,5 km/h or greater than 80,5 km/h for more than one second). For each run, read vacuum level at one-second intervals, >PIC FILE= "T0048826">

3.1.4.2. >PIC FILE= "T0048827">

3.1.4.3. >PIC FILE= "T0048828">

3.1.5. Dynamometer setting 3.1.5.1. Preparation

Perform the operations specified in 5.1.2.2.1 to 5.1.2.2.4 of Appendix 3.

3.1.5.2. Setting

After warm-up, drive the vehicle at a steady speed of 80 km/h and adjust dynamometer load to reproduce the vacuum reading (v) obtained in accordance with 3.1.4.3. Deviation from this reading must be no greater than 0,25 kPa. The same instruments are used for this exercise as were used during the road test.

3.2. Other setting methods

The dynamometer setting may be carried out at a constant speed of 80 km/h in accordance with the requirements of Appendix 3.

3.3. Alternative method

With the manufacturer's agreement the following method may be used: 3.3.1. The brake is adjusted so as to absorb the power exerted at the driving wheels at a constant speed of 80 km/h in accordance with the following table: >PIC FILE= "T0048829">

3.3.2. In the case of vehicles, other than passenger cars, with a reference mass of more than 1 700 kg, or vehicles with permanent all-wheel drive, the power values given in the table set out in 3.3.1 are multiplied by the factor 1,3.

Appendix 3 RESISTANCE TO PROGRESS OF A VEHICLE - MEASUREMENT METHOD ON THE ROAD - SIMULATION ON A CHASSIS DYNAMOMETER

1. OBJECT OF THE METHODS

The object of the methods defined below is to measure the resistance to progress of a vehicle at stabilized speeds on the road and to simulate this resistance on a dynamometer, in accordance with section 4.1.5 of Annex III.

2. DEFINITION OF THE ROAD

The road must be level and sufficiently long to enable the measurements specified below to be made. The slope must be constant to within ± 0,1 % and must not exceed 1,5 %.

3. ATMOSPHERIC CONDITIONS

3.1. Wind

Testing must be limited to wind speeds averaging less than 3 m/s with peak speeds less than 5 m/s. In addition, the vector component of the wind speed across the test road must be less than 2 m/s. Wind velocity must be measured 0,7 m above the road surface.

3.2. Humidity

The road must be dry.

3.3. Pressure - Temperature

Air density at the time of the test must not deviate by more than ± 7,5 % from the reference conditions, p = 100 kPa and T = 293,2 K.

4. VEHICLE PREPARATION

4.1. Running in

The vehicle must be in normal running order and adjustment after having been run-in for at least 3 000 km. The tyres must be run in at the same time as the vehicle or have a tread depth within 90 and 50 % of the initial tread depth.

4.2. Verifications

The following checks must be made in accordance with the manufacturer's specifications for the use considered: - wheels, wheel trims, tyres (make, type, pressure),

- front axle geometry,

- brake adjustment (elimination of parasitic drag),

- lubrication of front and rear axles,

- adjustment of the suspension and vehicle level, etc.

4.3. Preparation for the test 4.3.1. The vehicle is loaded to its reference mass. The level of the vehicle must be that obtained when the centre of gravity of the load is situated midway between the "R" points of the front outer seats and on a straight line passing through those points.

4.3.2. In the case of road tests, the windows of the vehicle must be closed. Any covers of air climatization systems, headlamps, etc, must be in the non-operating position.

4.3.3. The vehicle must be clean.

4.3.4. Immediately prior to the test the vehicle is brought to normal running temperature in an appropriate manner.

5. METHODS

5.1. Method of energy variation during coast-down 5.1.1. On the road 5.1.1.1. Test equipment and error: - time must be measured to an error lower than 0,1 second,

- speed must be measured to an error lower than 2 %.

5.1.1.2. Test procedure 5.1.1.2.1. Accelerate the vehicle to a speed 10 km/h greater than the chosen test speed V.

5.1.1.2.2. Place the gearbox in "neutral" position.

5.1.1.2.3. Measure the time (t1) taken for the vehicle to decelerate from >PIC FILE= "T0048830">

5.1.1.2.4. Perform the same test in the opposite direction : t2

5.1.1.2.5. >PIC FILE= "T0048831">

5.1.1.2.6. Repeat these tests several times such that the statistical accuracy (p) of the average >PIC FILE= "T0048832">

The statistical accuracy (p) is defined by: >PIC FILE= "T0048833">

5.1.1.2.7. Calculate the power by the formula: >PIC FILE= "T0049845"> >PIC FILE= "T0048834">

5.1.2. On the dynamometer 5.1.2.1. Measurement equipment and accuracy

The equipment must be identical to that used on the road.

5.1.2.2. Test procedure 5.1.2.2.1. Install the vehicle on the test dynamometer.

5.1.2.2.2. Adjust the tyre pressure (cold) of the driving wheels as required by the dynamometer.

5.1.2.2.3. Adjust the equivalent inertia of the dynamometer.

5.1.2.2.4. Bring the vehicle and dynamometer to operating temperature in a suitable manner.

5.1.2.2.5. Carry out the operations specified in 5.1.1.2 with the exception of 5.1.1.2.4 and 5.1.1.2.5 and with replacing M by I in the formula set out in 5.1.1.2.7.

5.1.2.2.6. Adjust the brake to meet the requirements of 4.1.4.1 of Annex III.

5.2. Torque measurement method at constant speed 5.2.1. On the road 5.2.1.1. Measurement equipment and error

Torque measurement must be carried out with an appropriate measuring device accurate to within 2 %.

Speed measurement must be accurate to within 2 %.

5.2.1.2. Test procedure 5.2.1.2.1. Bring the vehicle to the chosen stabilized speed V.

5.2.1.2.2. Record the torque, C(t) and speed over a period of a least 10 seconds by means of class 1 000 instrumentation meeting ISO Standard No 970.

5.2.1.2.3. Differences in torque C(t) and speed relative to time must not exceed 5 % for each second of the measurement period.

5.2.1.2.4. The torque C is the average torque derived from the following formula: >PIC FILE= "T0048835">

5.2.1.2.5. Carry out the test in the opposite direction, i.e. Ct2

5.2.1.2.6. Determine the average of these two torques Ct1 and Ct2 i.e. Ct.

5.2.2. On the dynamometer 5.2.2.1. Measurement equipment and error

The equipment must be identical to that used on the road.

5.2.2.2. Test procedure 5.2.2.2.1. Perform the operations specified in 5.1.2.2.1 to 5.1.2.2.4.

5.2.2.2.2. Perform the operations specified in 5.2.1.2.1 to 5.2.1.2.4.

5.2.2.2.3. Adjust the brake setting to meet the requirements of 4.1.4.1 of Annex III.

5.3. Integrated torque over variable driving pattern 5.3.1. This method is a non-obligatory complement to the constant speed method described in 5.2.

5.3.2. >PIC FILE= "T0048836">

the actual torque values with respect to time during operation of the test vehicle with a defined driving cycle. The integrated torque is then divided by the time difference.

The result is: >PIC FILE= "T0048837">

5.3.3. Dynamometer setting >PIC FILE= "T0048838">

the brake setting is adjusted until the values are equal to within ± 5 %.

Note:

This method can be used only for dynamometers with electrical inertia simulation or fine adjustment.

5.3.4. Acceptance criteria

Standard deviation of six measurements must be no more than 2 % of the mean value.

5.4. Method of deceleration measurement by gyroscopic platform 5.4.1. On the road 5.4.1.1. Measurement equipment and error - speed must be measured with an error lower than 2 %,

- deceleration must be measured with an error lower than 1 %,

- the slope of the road must be measured with an error lower than 1 %,

- time must be measured with an error lower than 0,1 second.

The level of the vehicle is measured on a reference horizontal ground ; as an alternative, it is possible to >PIC FILE= "T0048839">

5.4.1.2. Test procedure 5.4.1.2.1. Accelerate the vehicle to a speed 5 km/h greater than the chosen test speed : V.

5.4.1.2.2. Record the deceleration between V ± 0,5 km/h and V - 0,5 km/h.

5.4.1.2.3. Calculate the average deceleration attributed to the speed V by the formula: >PIC FILE= "T0048840">

5.4.1.2.4. >PIC FILE= "T0048841">

5.4.1.2.5. Calculate the average of >PIC FILE= "T0048842">

5.4.1.2.6. >PIC FILE= "T0048843">

5.4.1.2.7. >PIC FILE= "T0048844">

5.4.2. Dynamometer method 5.4.2.1. Measurement equipment and error

The measurement instrumentation of the dynamometer itself must be used as defined in section 2 of Appendix 2 to this Annex.

5.4.2.2. Test procedure 5.4.2.2.1. Adjustment of the force on the rim under steady speed. On chassis dynamometer, the total resistance is of the type:

(Ftotal) = (Findicated) + (Fdriving axle rolling), with

(Ftotal) = (Froad),

(Findicated) = (Froad) - (Fdriving axle rolling),

where:

(Findicated) is the force indicated on the force indicating device of the chassis dynamometer,

(Froad) is known,

(Fdriving axle rolling) can be: - measured on chassis dynamometer able to work as a motor.

The test vehicle, gearbox in neutral position, is driven by the chassis dynamometer at the test speed ; the rolling resistance of the driving axle is then measured on the force indicating device of the chassis dynamometer.

- determined on chassis dynamometer unable to work as a motor.

For the two-roller-chassis dynamometer, the Rr value is the one which is determined before on the road.

For the single-roller chassis dynamometer, the Rr value is the one which is determined on the road multiplied by a coefficient (R) which is equal to the ratio between the driving axle mass and the vehicle total mass.

Note:

Rr is obtained from the curve : F = f(V).

Appendix 4 VERIFICATION OF INERTIAS OTHER THAN MECHANICAL

1. OBJECT

The method described in this Appendix makes it possible to check that the simulated total inertia of the dynamometer is carried out satisfactorily in the running phases of the operating cycle.

2. PRINCIPLE

2.1. Drawing up working equations

Since the dynamometer is subjected to variations in the rotating speed of the roller(s), the force at the surface of the roller(s) can be expressed by the formula: >PIC FILE= "T0049836">

Note:

An explanation of this formula with reference to dynamometers with mechanically simulated inertias is appended.

Thus, the total inertia is expressed as follows: >PIC FILE= "T0048845">

The total inertia (I) is determined during an acceleration or deceleration test with values higher than or equal to those obtained on an operating cycle.

2.2. Specification for the calculation of total inertia

The test and calculation methods must make it possible to determine the total inertia I with a relative error >PIC FILE= "T0048846">

3. SPECIFICATION

3.1. The mass of the simulated total inertia I must remain the same as the theoretical value of the equivalent inertia (see 5.1 of Annex III) within the following limits: 3.1.1. ± 5 % of the theoretical value for each instantaneous value;

3.1.2. ± 2 % of the theoretical value for the average value calculated for each sequence of the cycle.

3.2. The limit given in 3.1.1 is brought to ± 50 % for one second when starting and, for vehicles with manual transmission, for two seconds during gear changes.

4. VERIFICATION PROCEDURE

4.1. Verification is carried out during each test throughout the cycle defined in 2.1 of Annex III.

4.2. However, if the requirements of section 3 are met, with instantaneous accelerations which are at least three times greater or smaller than the values obtained in the sequences of the theoretical cycle, the verification described above is not necessary.

5. TECHNICAL NOTE

Explanation of drawing-up working equations. 5.1. Equilibrium of the forces on the road: >PIC FILE= "T0048847">

5.2. Equilibrium of the forces on dynamometer with mechanically simulated inertias: >PIC FILE= "T0048848">

5.3. Equilibrium of the forces of dynamometer with non-mechanically simulated inertias: >PIC FILE= "T0048849">

>PIC FILE= "T0048850">

Appendix 5 DESCRIPTION OF TAILPIPE EMISSION-SAMPLING SYSTEMS

1. INTRODUCTION

1.1. There are several types of sampling devices capable of meeting the requirements set out in section 4.2 of Annex III.

The devices described in 3.1, 3.2 and 3.3 will be deemed acceptable if they satisfy the main criteria relating to the variable dilution principle.

1.2. In its communications, the laboratory must mention the system of sampling used when performing the test.

2. CRITERIA RELATING TO THE VARIABLE-DILUTION SYSTEM FOR MEASURING EXHAUST-GAS EMISSIONS

2.1. Scope

This section specifies the operating characteristics of an exhaust-gas sampling system intended to be used for measuring the true mass emissions of a vehicle exhaust in accordance with the provisions of this Directive. The principle of variable-dilution sampling for measuring mass emissions requires three conditions to be satisfied: 2.1.1. the vehicle exhaust gases must be continuously diluted with ambient air under specified conditions;

2.1.2. the total volume of the mixture of exhaust gases and dilution air must be measured accurately;

2.1.3. a continuously proportional sample of the diluted exhaust gases and the dilution air must be collected for analysis.

The quantity of gaseous pollutants emitted is determined from the proportional sample concentrations and the total volume measured during the test. The sample concentrations are corrected to take account of the pollutant content of the ambient air. In addition, where vehicles are equipped with compressionignition engines, their particulate emissions are plotted.

2.2. Technical summary

Figure III.5.2.2 gives a schematic diagram of the sampling system. 2.2.1. The vehicle exhaust gases must be diluted with a sufficient amount of ambient air to prevent any water condensation in the sampling and measuring system.

2.2.2. The exhaust-gas sampling system must be so designed as to make it possible to measure the average volume concentrations of the CO2, CO, HC and NOx, and, in addition, in the case of vehicles equipped with compression-ignition engines, of the particulate emissions, contained in the exhaust gases emitted during the vehicle testing cycle.

2.2.3. The mixture of air and exhaust gases must be homogeneous at the point where the sampling probe is located (see 2.3.1.2).

2.2.4. The probe must extract a representative sample of the diluted gases.

2.2.5. The system must make it possible to measure the total volume of the diluted exhaust gases from the vehicle being tested.

>PIC FILE= "T0048851">

2.2.6. The sampling system must be gas-tight. The design of the variable-dilution sampling system and the materials that go to make it up must be such that they do not affect the pollutant concentration in the diluted exhaust gases. Should any component in the system (heat exchanger, cyclone separator, blower, etc.) change the concentration of any of the pollutants in the diluted exhaust gases and the fault cannot be corrected, then sampling for that pollutant must be carried out before that component.

2.2.7. If the vehicle tested is equipped with an exhaust system comprising more than one tailpipe, the connecting tubes must be connected together by a manifold installed as near as possible to the vehicle.

2.2.8. The gas samples must be collected in sampling bags of adequate capacity so as not to hinder the gas flow during the sampling period. These bags must be made of such materials as will not affect the concentration of pollutant gases (see 2.3.4.4).

2.2.9. The variable-dilution system must be so designed as to enable the exhaust gases to be sampled without appreciably changing the back-pressure at the exhaust pipe outlet (see 2.3.1.1).

2.3. Specific requirements 2.3.1. Exhaust-gas collection and dilution device 2.3.1.1. The connection tube between the vehicle exhaust tailpipe(s) and the mixing chamber must be as short as possible ; it must in no case: - cause the static pressure at the exhaust tailpipe(s) on the vehicle being tested to differ by more than ± 0,75 kPa at 50 km/h or more than ± 1,25 kPa for the whole duration of the test from the static pressures recorded when nothing is connected to the vehicle tailpipes. The pressure must be measured in the exhaust tailpipe or in an extension having the same diameter, as near as possible to the end of the pipe,

- change the nature of the exhaust gas.

2.3.1.2. There must be a mixing chamber in which the vehicle exhaust gases and the dilution air are mixed so as to produce a homogeneous mixture at the chamber outlet.

The homogeneity of the mixture in any cross-section at the location of the sampling probe must not vary by more than ± 2 % from the average of the values obtained at least five points located at equal intervals on the diameter of the gas stream. In order to minimize the effects on the conditions at the exhaust tailpipe and to limit the drop in pressure inside the dilution air-conditioning device, if any, the pressure inside the mixing chamber must not differ by more than 0,25 kPa from atmospheric pressure.

2.3.2. Suction device/volume measuring device

This device may have a range of fixed speeds so as to ensure sufficient flow to prevent any water condensation. This result is generally obtained by keeping the concentration of CO2 in the dilute exhaust-gas sampling bag lower than 3 % by volume.

2.3.3. Volume measurement 2.3.3.1. The volume measuring device must retain its calibration accuracy to within ± 2 % under all operating conditions. If the device cannot compensate for variations in the temperature of the mixture of exhaust gases and dilution air at the measuring point, a heat exchanger must be used to maintain the temperature to within ± 6 K of the specified operating temperature.

If necessary, a cyclone separator can be used to protect the volume measuring device.

2.3.3.2. A temperature sensor must be installed immediately before the volume measuring device. This temperature sensor must have an accuracy and a precision of ± 1 K and a response time of 0,1 second at 62 % of a given temperature variation (value measured in silicone oil).

2.3.3.3. The pressure measurements must have a precision and an accuracy of ± 0,4 kPa during the test.

2.3.3.4. The measurement of the pressure difference from atmospheric pressure is taken before and, if necessary, after the volume measuring device.

2.3.4. Gas sampling 2.3.4.1. Dilute exhaust gases 2.3.4.1.1. The sample of dilute exhaust gases is taken before the suction device but after the conditioning devices (if any).

2.3.4.1.2. The flow-rate must not deviate by more than ± 2 % from the average.

2.3.4.1.3. The sampling rate must not fall below 5 litres per minute and must not exceed 0,2 % of the flow-rate of the dilute exhaust gases.

2.3.4.1.4. An equivalent limit applies to constant-mass sampling systems.

2.3.4.2. Dilution air 2.3.4.2.1. A sample of the dilution air is taken at a constant flow-rate near the ambient air inlet (after the filter if one is fitted).

2.3.4.2.2. The air must not be contaminated by exhaust gases from the mixing area.

2.3.4.2.3. The sampling rate for the dilution air must be comparable to that used in the case of the dilute exhaust gases.

2.3.4.3. Sampling operations 2.3.4.3.1. The materials used for the sampling operations must be such that they do not change the pollutant concentration.

2.3.4.3.2. Filters may be used in order to extract the solid particles from the sample.

2.3.4.3.3. Pumps are required in order to convey the sample to the sampling bag(s).

2.3.4.3.4. Flow control valves and flow-meters are needed in order to obtain the flow-rates required for sampling.

2.3.4.3.5. Quick-fastening gas-tight connections may be used between the three-way valves and the sampling bags, the connections sealing themselves automatically on the bag side. Other systems may be used for conveying the samples to the analyzer (three-way stop valves, for example).

2.3.4.3.6. The various valves used for directing the sampling gases must be of the quick-adjusting and quick-acting type.

2.3.4.4. Storage of the sample

The gas samples are collected in sampling bags of adequate capacity so as not to reduce the sampling rate. The bags must be made of such a material as will not change the concentration of synthetic pollutant gases by more than ± 2 % after 20 minutes.

2.4. Additional sampling unit for the testing of vehicles equipped with a compression-ignition engine 2.4.1. By way of a departure from the taking of gas samples from vehicles equipped with spark-ignition engines, the hydrocarbon and particulate sampling points are located in a dilution tunnel.

2.4.2. In order to reduce heat losses in the exhaust gases between the exhaust tail pipe and the dilution tunnel inlet, the pipe may not be more than 3,6 m long, or 6,1 m long if heat insulated. Its internal diameter may not exceed 105 mm.

>PIC FILE= "T0048852">

2.4.3. >PIC FILE= "T0048853">

which consists of a straight tube of electrically-conductive material, in order to guarantee that the diluted exhaust gas is homogeneous at the sampling points and that the samples consist of representative gases and particulates. The dilution tunnel must be at least 200 mm in diameter and the system must be earthed.

2.4.4. The particulate sampling system consists of a sampling probe in the dilution tunnel and two series-mounted filters. Quick-acting valves are located both up and downstream of the two filters in the direction of flow.

The configuration of the sample probe must be as indicated in Figure III.5.2.4.4.

2.4.5. The particulate sampling probe must be arranged as follows:

It must be installed in the vicinity of the tunnel centreline, roughly 10 tunnel diameters downstream of the gas inlet, and have an internal diameter of at least 12 mm.

The distance from the sampling tip to the filter mount must be at least five probe diameters, but must not exceed 1 020 mm.

2.4.6. The sample gas flow measuring unit consists of pumps, gas flow regulators and flow measuring units.

2.4.7. The hydrocarbon sampling system consists of a heated sampling probe, line, filter and pump. The sampling probe must be installed in such a way, at the same distance from the exhaust gas inlet as the particulate sampling probe, that neither interferes with samples taken by the other. It must have a minimum internal diameter of 4 mm.

2.4.8. All heated parts must be maintained at a temperature of 463 K (190 °C) ± 10 K by the heating system.

2.4.9. If it is not possible to compensate for variations in the flow rate there must be a heat exchanger and a temperature control device as specified in 2.3.3.1 so as to ensure that the flow rate in the system is constant and the sampling rate is accordingly proportional.

3. DESCRIPTION OF THE DEVICES

3.1. Variable dilution device with positive displacement pump (PDP-CVS) (Figure III.5.3.1.) 3.1.1. The positive displacement pump - constant volume sampler (PDP-CVS) satisfies the requirements of this Annex by metering at a constant temperature and pressure through the pump. The total volume is measured by counting the revolutions made by the calibrated positive displacement pump. The proportional sample is achieved by sampling with pump, flow-meter and flow control valve at a constant flow-rate.

3.1.2. Figure III.5.3.1 is a schematic drawing of such a sampling system. Since various configurations can produce accurate results exact conformity with the drawing is not essential. Additional components such as instruments, valves, solenoids and switches may be used to provide additional information and coordinate the functions of the component system.

3.1.3. The collecting equipment consists of: 3.1.3.1. a filter (D) for the dilution air, which can be preheated if necessary. This filter must consist of activated charcoal sandwiched between two layers of paper, and shall be used to reduce and stabilize the hydrocarbon concentrations of ambient emissions in the dilution air;

3.1.3.2. a mixing chamber (M) in which exhaust gas and air are mixed homogeneously;

>PIC FILE= "T0048854">

3.1.3.3. a heat exchanger (H) of a capacity sufficient to ensure that throughout the test the temperature of the air/exhaust-gas mixture measured at a point immediately upstream of the positive displacement pump is within ± 6 K of the designed operating temperature. This device must not affect the pollutant concentrations of diluted gases taken off after for analysis;

3.1.3.4. a temperature control system (TC), used to preheat the heat exchanger before the test and to control its temperature during the test, so that deviations from the designed operating temperature are limited to ± 6 K;

3.1.3.5. the positive displacement pump (PDP), used to transport a constant-volume flow of the air/exhaust-gas mixture ; the flow capacity of the pump must be large enough to eliminate water condensation in the system under all operating conditions which may occur during a test ; this can be generally ensured by using a positive displacement pump with a flow capacity: 3.1.3.5.1. - twice as high as the maximum flow of exhaust gas produced by accelerations of the driving cycle, or

3.1.3.5.2. - sufficient to ensure that the CO2 concentration in the dilute-exhaust sample bag is less than 3 % by volume;

3.1.3.6. a temperature sensor (T1) (accuracy and precision ± 1 K), fitted at a point immediately upstream of the positive displacement pump ; it must be designed to monitor continuously the temperature of diluted exhaust-gas mixture during the test;

3.1.3.7. a pressure gauge (G1) (accuracy and precision ± 0,4 kPa) fitted immediately upstream of the volume meter and used to register the pressure gradient between the gas mixture and the ambient air;

3.1.3.8. another pressure gauge (G2) (accuracy and precision ± 0,4 kPa) fitted so that the different pressure between pump inlet and pump outlet can be registered;

3.1.3.9. two sampling outlets (S1 and S2) for taking constant samples of the dilution air and of the diluted exhaust-gas/air mixture;

3.1.3.10. a filter (F), to extract solid particles from the flows of gas collected for analysis;

3.1.3.11. pumps (P), to collect a constant flow of the dilution air as well as the diluted exhaust-gas/air mixture during the test;

3.1.3.12. flow controllers (N), to ensure a constant uniform flow of the gas samples taken during the course of the test from sampling probes S1 and S2 ; and flow of the gas samples must be such that, at the end of each >PIC FILE= "T0049853">

3.1.3.13. flow-meters (FL), for adjusting and monitoring the constant flow of gas samples during the test;

3.1.3.14. quick-acting valves (V), to divert a constant flow of gas samples into the sampling bags or to the outside vent;

3.1.3.15. gas-tight, quick-lock coupling elements (Q) between the quick-acting valves and the sampling bags ; the coupling must close automatically on the sampling-bag side ; as an alternative, other ways of transporting the samples to the analyzer may be used (three-way stopcocks, for instance);

3.1.3.16. bags (B), for collecting samples of the diluted exhaust gas and of the dilution air during the test ; they must be of sufficient capacity not to impede the sample flow ; the bag material must be such as to affect neither the measurements themselves nor the chemical composition of the gas samples (for instance : laminated polyethylene/polyamide films, or fluorinated polyhydrocarbons);

3.1.3.17. a digital counter (C), to register the number of revolutions performed by the positive displacement pump during the test;

3.1.4. Additional equipment required when testing diesel-engined vehicles

To comply with the requirements of 4.3.1.1 and 4.3.2 of Annex III, the additional components within the dotted lines in Figure III.5.3.1 must be used when testing diesel-engined vehicles: >PIC FILE= "T0048855">

Particulate sampling system >PIC FILE= "T0048856">

3.2. Critical-flow venturi dilution device (CFV-CVS) (Figure III.5.3.2.) 3.2.1. Using a critical-flow venturi in connection with the CVS sampling procedure is based on the principles of flow mechanics for critical flow. The variable mixture flow rate of dilution and exhaust gas is maintained as sonic velocity which is directly proportional to the square root of the gas temperature. Flow is continually monitored, computed and integrated over the test.

If an additional