GB/T 37154-2018Fuel cell electric vehicles—Test methods of hydrogen emission (English PDF)

6.1.3 Measurement of relative volume concentration of hydrogen emission

Relative volume concentration of hydrogen emission shall be measured as follows.

a) carry out hydrogen emission relative volume concentration measurement from starting fuel cell engine until fuel cell engine is fully stopped;

b) location of measurement points. 100 mm outside exhaust ports, located on the extension line of geometrical center line of exhaust ports.

6.1.4 Test requirements

Test process shall meet the following requirements.

a) test is carried out for one time;

b) record continuously the time history curve of hydrogen emission relative volume concentration with the sampling frequency not lower than 5 Hz.

6.2 Hydrogen emission in the working state under cyclic operation conditions

6.2.1 Preparation of test vehicles

Before test is officially started, place test vehicle on a chassis dynamometer with load and inertia simulation; carry out test at a certain speed to make the working temperature of fuel cell electric engine to achieve the working state temperature as specified by manufacturers; then stop vehicle and shut down fuel cell electric engine.

6.2.2 Test process

Test process shall meet the following requirements.

a) fuel cell electric vehicles of categories M1 and N1, and M2 (total mass not exceeding 3.5 t for category M2). load of test vehicle is applied as specified in GB 18352.5-2013. Start vehicles in accordance with the procedures as specified by manufacturers; carry out test under the cyclic operation conditions (including urban operation cycles and urban operation cycles) as specified in GB 18352.5-2013, Appendix CA. During test, the deviations of vehicle speed shall be as specified in GB 18352.5-2013. For fuel cell electric vehicles of categories M2, M3, N2 and N3 with a total mass exceeding 3.5 t. load of test vehicle is applied as specified in GB/T 19754-2015. Start vehicle in accordance with the procedure as specified by manufacturers; carry out test under the Chinese typical urban public transportation cyclic working conditions as specified in GB/T 19754-2015, Annex […]

A.1 Actual hydrogen consumption of fuel cell stack

If the results of hydrogen mass flowmeter are recorded in flow unit, then the actually measured hydrogen consumption of fuel cell stack within a time is calculated in accordance with Equation (A.1). where.

MH2 - the actually measured hydrogen consumption of fuel cell stack, in g; mH2 - the actually measured hydrogen flow of fuel cell stack, in g/s; T1 - the starting time, in s; T2 - the ending time, in s.

A.2 Theoretical hydrogen consumption of fuel cell stack

The theoretical hydrogen consumption of fuel cell stack within a time is calculated in accordance with Equation (A.2). where.

MH2_theo - the theoretical hydrogen consumption of fuel cell stack, in g; mH2_theo - the theoretical hydrogen flow rate of fuel cell stack, in g/s; T1 - the starting time, in s; T2 - the ending time, in s.

The theoretical hydrogen flow rate is calculated in accordance with Faraday Formula [see Equation (A.3)]. […]