Document ID: chunk:federal_register_of_legislation:F2023L00129:reg:10:p60
Version: federal_register_of_legislation:F2023L00129
Segment Type: reg
Provision Reference: reg 10 (pt 60/150)
Character Range: 880767–883834

case of a gas engine.
6.1. Emission-OBD family
 The manufacturer is responsible for determining the composition of an emission-OBD family. Grouping engine systems within an emission-OBD family shall be based on good engineering judgement and be subject to approval by the Type Approval Authority.
 Engines that do not belong to the same engine family may still belong to the same emission-OBD family.
6.1.1. Parameters defining an emission-OBD family
 An emission-OBD family is characterised by basic design parameters that shall be common to engine systems within the family.
 In order that engine systems are considered to belong to the same OBD-engine family, the following list of basic parameters shall be similar:
(a) Emission control systems;
(b) Methods of OBD monitoring;
(c) Criteria for performance and component monitoring;
(d) Monitoring parameters (e.g. frequency).
 These similarities shall be demonstrated by the manufacturer by means of relevant engineering demonstration or other appropriate procedures and subject to the approval of the Type Approval Authority.
 The manufacturer may request approval by the Type Approval Authority of minor differences in the methods of monitoring/diagnosing the engine emission control system due to engine system configuration variation, when these methods are considered similar by the manufacturer and:
(a) They differ only to match specificities of the considered components (e.g. size, exhaust flow, etc.); or
(b) Their similarities are based on good engineering judgement.
6.1.2. OBD-parent engine system
 Compliance of an emission-OBD family with the requirements of this annex is achieved by demonstrating the compliance of the OBD-parent engine system of this family.
 The selection of the OBD-parent engine system is made by the manufacturer and subject to the approval of the Type Approval Authority.
 Prior to testing the Type Approval Authority may decide to request the manufacturer to select an additional engine for demonstration.
 The manufacturer may also propose to the Type Approval Authority to test additional engines to cover the complete emission-OBD family.
6.2. Procedures for demonstrating the malfunction classification
 The manufacturer shall provide the documentation justifying the proper classification of each malfunction to the Type Approval Authority. This documentation shall include a failure analysis (for example elements of a "failure mode and effect analysis") and may also include:
(a) Simulation results;
(b) Test results;
(c) Reference to previously approved classification.
 In the following paragraphs the requirements for demonstrating the correct classification are listed, including requirements for testing. The minimum number of tests is four and the maximum number of tests is four times the number of engine families considered within the emission OBD family. The Type Approval Authority may decide to curtail the test at any time before this maximum number of failure tests has been reached.
 In specific cases where the classification testing is not possible