GCC STANDARDIZATION ORGANIZATION (GSO)  
 
 
 
 
 
 
 
 
 
GSO 2/ 1/ FDS /  ECE -13H – 2: 2009  
ECE -13H – 2: 2008 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
السياراث-  طرق الاختبار لىظامِ  المكابح - الجزء الثاوي : تعييه سعت أجهزة خزنِ  الطاقت  
Motor Vehicles: Methods of Test for Braking System – Part 2: 
Determination of Capacity of Energy Storage Devices    
  
 
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ECE -13H - 2: 2006
ECE -13H - 2: 2006
 
 
Foreword  
 
GCC Standardization Organization (GSO) is a regional Organization which 
consists of the National Standards Bodies of GCC member States. One of GSO 
main functions is to issue Gulf Standards /Technical regulation s through 
specialized technical committees (TCs).  
 
GSO through the technical program of committee TC No 2 /1 "The Gulf technical 
Subcommittee for vehicles and tyres standards  "has updated the GSO Standard No.  
: ECE -13H - 2: 2006 " Motor Vehicles: Methods of Test for Braking System – Part 
2: Determination of Capacity of Energy Storage Devices "in its original language. 
The Draft Standard has been prepared by (State of Qatar)  
  
This standard has been approved in its original language without any technical 
modifications as a Gulf Standard by GSO Board of Directors  in its meeting No. (       
), held on      /    /            H,     /     /              G. The approved standard will replace 
and supersede the GSO standard No. :  ECE -13H - 2: 2006  
 
  
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MOTOR VEHICLES   
METHODS OF TEST FOR BRAKING SYSTEM  
– PART 2: DETERMINATION OF CAPACITY OF  
ENERGY STORAGE DEVICES  
 
 
1-                     SCOPE AND FIELD OF APPLICATION  
 
This Gulf standard is concerned with the methods of test for the determination  
of the capacity of energy storage devices of passenger cars and multi -purpose  
vehicles.  
 
2-                     COMPLEMENTARY REFERENCES  
 
2.1                   GSO ECE 13H:200 9“Motor Vehicles – Braking System of Passenger Cars and  
                        Multi -Purpose Vehicles”.  
2.2                   GSO ECE 13H -1:200 9 “Motor Vehicles – Methods of Test for Braking Sy stem – 
                        Part 1: Determination of Braking Performance”.  
2.3                   GSO ECE 13H -3:200 9 “Motor Vehicles – Methods of Test for Braking System – 
                        Part 3:Determination of Distribution of Braking Among the Axles of Vehicles”.  
2.4                   GSO ECE 13H -4: 2009  “Motor Vehicles – Methods of Test for Braking System –                          
                         Determination of Function of Antilock Systems”.  
2.5                  GSO ECE 13H -5: 2009 “Motor Vehicles – Methods of Test for Braking System –               
Part 5:  Determination of Performance of Brake Lining Using Inertia 
Dynamometer”.  
2.6                 GSO ECE 13H -6: 2009  “Motor Vehicles – Methods of Test for Braking System -     
Part 6: Determination of Coefficient of Adhesion.  
 
3.   CAPACITY OF ENERGY STORAGE DEVICES (ENERGY 
ACCUMULATORS)  
 
3.1.  General  
 
3.1.1.  Vehicles on which the braking equipment requires the use of stored energy 
provided by hydraulic fluid under pressure shall be e quipped with energy storage 
devices (energy accumulators) of a capacity meeting the requirements of 
paragraphs 1.2. or 1.3. of this annex;  
 
3.1.2.  However, the energy storage devices shall not be required to be of a prescribed 
capacity if the braking syst em is such that in the absence of any energy reserve it 
is possible with the service brake control to achieve a braking performance at 
least equal to that prescribed for the secondary braking system;    
  
 
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3.1.3.  In verifying compliance with the requirements o f paragraphs 1.2., 1.3. and 2.1. of 
this annex, the brakes shall be adjusted as closely as possible and, for 
paragraph  1.2. of this annex, the rate of full -stroke actuations must be such as to 
provide an interval of at least 60 seconds between each actuati on. 
 
3.2.  Vehicles equipped with a hydraulic braking system with stored energy shall meet 
the following requirements:  
 
3.2.1.  After eight full -stroke actuations of the service brake control, it shall still be 
possible to achieve, on the ninth application , the performance prescribed for the 
secondary braking system.  
 
3.2.2.  Testing shall be performed in conformity with the following requirements:  
 
3.2.2.1.  Testing shall commence at a pressure that may be specified by the manufacturer 
but is not higher than the cut -in pressure; 1/ 
 
3.2.2.2.  The energy storage device(s) shall not be fed; in addition, any energy storage 
device(s) for auxiliary equipment shall b e isolated.  
 
3.3.  Vehicles equipped with a hydraulic braking system with stored energy which 
cannot meet the requirements of paragraph 5.2.4.1. of this Regulation shall be 
deemed to satisfy that paragraph if the following requirements are met:  
 
3.3.1.  After any single transmission failure it shall still be possible after eight full -stroke 
actuations of the service brake control, to achieve, at the ninth application, at least 
the performance prescribed for the secondary braking system.  
 
3.3.2.  Testing sha ll be performed in conformity with the following requirements:  
 
3.3.2.1.  With the energy source stationary or operating at a speed corresponding to the 
engine idling speed, any transmission failure may be induced.  Before inducing 
such a failure, the energ y storage device(s) shall be at a pressure that may be 
specified by the manufacturer but not exceeding the cut -in pressure;  
 
3.3.2.2.  The auxiliary equipment and its energy storage devices, if any, shall be isolated.  
 
4.   CAPACITY OF HYDRAULIC FLUID ENERGY SOURCES  
 
4.1.  The energy sources shall meet the requirements set out in the following 
paragraphs.  
 
                                                
1/ The initial energy level shall be stated in the approval document.   
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 4.1.1.    Definitions  
 
4.1.1.1.  "p1" represents the maximum system operational pressure (cut -out pressure) in the 
energy storage device(s) specified by the manufacturer.  
 
4.1.1.2.  "p2" represents the pressure after four full -stroke actuations with the service brake 
control, starting at p 1, without having fed the energy storage device(s).  
 
4.1.1.3.  "t" represents the time required for the pressure to ri se from p 2 to p 1 in the energy 
storage device(s) without application of the brake control.  
 
4.1.2.  Conditions of measurement  
 
4.1.2.1.  During the tests to determine the time t, the feed rate of the energy source shall be 
that obtained when the engine is r unning at the speed corresponding to its 
maximum power or at the speed allowed by the over -speed governor.  
 
4.1.2.2.  During the test to determine the time t, energy storage device(s) for auxiliary 
equipment shall not be isolated other than automatically.  
 
4.1.3.  Interpretation of results  
 
4.1.3.1.  In the case of all vehicles, the time t shall not exceed 20 seconds.  
 
5.  CHARACTERISTICS OF WARNING DEVICES  
 
  With the engine stationary and commencing at a pressure that may be specified by 
the manufacturer but does not exceed the cut -in pressure, the warning device shall 
not operate following two full -stroke actuations of the service brake control.  
   
  
 
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 Annex 3 - Appendix  
 
PROCEDURE FOR MONITORING THE STATE OF BATTERY CHARGE  
 
This procedure is applicable to vehicle batteries used for traction and regenerative 
braking.  
 
The procedure requires the use of a bi -directional DC Watt -hour meter.  
 
1. Procedure  
 
1.1. If the batteries are new or have been subject to extended storage, they shall 
be cycled as recommended by the manufacturer. A minimum 8 -hour soak 
period at ambient temperature shall be allowed after completion of 
cycling.  
 
1.2. A full charge shall be established using the manufacturer's recommended 
charging procedure.  
 
1.3. When the braking tests of paragraphs 1.2.11., 1.4.1.2.3., 1.5.1.6., 1.5.1.7. 
and 1.5.2.4. of Annex 3 are conducted the watt -hours consumed by the 
traction motors and supplied by the  regenerative braking system shall be 
recorded as a running total which shall then be used to determine the state 
of charge existing at the beginning or end of a particular test.  
 
1.4. To replicate a level of state of charge in the batteries for comparativ e tests, 
such as those of paragraph 1.5.2.4., the batteries shall be either recharged 
to that level or charged to above that level and discharged into a fixed load 
at approximately constant power until the required state of charge is 
reached.  Alternativel y, for vehicles with battery powered electric traction 
only, the state of charge may be adjusted by running the vehicle. Tests 
conducted with a battery partially charged at their start shall be 
commenced as soon as possible after the desired state of charg e has been 
reached.