GB/T 40711.2-2021Off-cycle technology/device energy saving effects evaluation methods for passenger cars—Part 2:Idle start-stop system (English PDF)

1 Scope

This document specifies the evaluation methods for the energy saving effects of the idle start-stop system for passenger cars.

This document applies to M1 vehicles with an idle start-stop system, of which the maximum design gross mass does not exceed 3 500 kg.

This document applies to vehicles capable of burning gasoline or diesel, not to externally rechargeable hybrid electric vehicles.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the version corresponding to that date is applicable to this document; for undated references, the latest version (including all amendments) is applicable to this document.

GB 18352.6-2016, Limits and measurement methods for emissions from light-duty vehicles (CHINA 6)

GB/T 19233-2020, Measurement methods of fuel consumption for light-duty vehicles

GB 19578, Fuel consumption limits for passenger cars

GB/T 19753-2021, Test methods for energy consumption of light-duty hybrid electric vehicles

GB 27999, Fuel consumption evaluation methods and targets for passenger cars

3 Terms and definitions

Terms and definitions defined in GB 27999, and the following ones apply to this document.

4 General requirements

4.1 The idle start-stop system, during the on-period, shall not affect the safe operation of the vehicle.

4.2 The automobile manufacturer or its authorized agent shall submit a vehicle representing the tested model to the inspection agency, and provide the following relevant information:

a) description of suppliers and models of key components of the idle start-stop system;

b) description of the function and method of use of the idle start-stop system, including the conditions for turning off and restarting the engine;

c) engine idle speed;

d) list of energy-saving devices that can be manually switched on and off, including device name and function descriptions.

4.3 The tested vehicle shall comply with the requirements of fuel consumption limits specified in GB 19578 and requirements on pollutant emission in GB 18352.6-2016 (or other applicable versions).

4.4 The test conditions shall meet the requirements in Chapter 5 of GB/T 19233-2020; for non-off-vehicle chargeable hybrid electric vehicles (NOVC-HEV), the test conditions shall meet the requirements in Chapter 4 of GB/T 19753-2021.

4.5 Test the idle start-stop system in accordance with the requirements of Chapter 5; record the test vehicle parameters and test data in accordance with the provisions of Appendix A. Calculate the energy saving effects according to the requirements of Chapter 6; express the calculation result in liters per 100 kilometers (L/100 km); round (round up) to two decimal places.

5 Test procedures