GB 19755-2016Technical requirements and measurement methods for emissions from light-duty hybrid electric vehicles (English PDF)

3.1 Hybrid electric vehicle

Vehicles at least capable of obtaining power form the following two types of on-board stored energy.

3.2 Light-duty hybrid electric vehicle

Hybrid electric vehicles within the scope of GB 18352.

3.3 Type test

Refers to the stereotypes test, after the design of a hybrid electric vehicle model is completed, to the trial new product to verify whether the product can meet the technical requirements of this Standard.

3.4 Energy storage device

Devices, mounted on hybrid electric vehicles, capable of storing electrical energy, including all power batteries, supercapacitors and flywheel batteries or other combinations.

3.5 Deterioration factors

Deterioration factors determined according to GB 18352.

3.6 Electricity balance

In a test cycle, the integrated value with time of the current measured value of the energy storage device of hybrid electric vehicles, expressed in Q, the unit is Ah. When the electricity balance is greater than zero, the energy storage device discharges;

5.1 General requirements

5.1.1 Type test, production consistency inspection and in-use compliance inspection of hybrid electric vehicles shall meet the requirements of the corresponding stage in GB18352.

5.1.2 Pollutant emissions of hybrid electric vehicles shall meet the limit requirements of the corresponding stage in GB 18352.

5.2 Type test items

Test items shall be carried out in the type test of different types of vehicles are as shown in Table 2.

6.1.1 Off-board vehicle charging (OVC) hybrid electric vehicles without function of manual selection of driving mode

The test shall be carried out under the following conditions. […]

6.1.1.1 Condition A test

6.1.1.1.2 Vehicle pretreatment

6.1.1.1.2.1 For hybrid electric vehicles with compression-ignition engines, continuously operate 3 two-type (suburban) cycles of type I test specified in GB 18352 according to the requirements of 6.1.1.1.5.3 as pretreatment.

6.1.1.1.4 Charging of energy storage device

During vehicle exposure, the energy storage device shall be charged as follows to achieve the maximum state of charge.

6.1.1.1.4.1 Charging requirements

6.1.1.1.5 Test procedure

The vehicle is normally started and the first cycle begins when the vehicle enters the start-up state. The manufacturer shall carry out the test as specified in 6.1.1.1.5.1 (Option 1) or as specified in 6.1.1.1.5.2 (Option 2).

6.1.1.1.5.1 Option 1 (single cycle). Sampling shall be carried out according to the specifications of GB 18352. Sampling shall be started before or during the start of the vehicle. Sampling shall be stopped at the end of the last idle speed condition of the two-type suburb cycle.

6.1.1.1.5.2 Option 2 (multiple cycles). Sampling shall be started before or during the start of the vehicle. A number of (N times) test cycles shall be repeated continuously.

Stop sampling at the end of the last idle speed period of the first suburb (2-type) cycle when the energy storage device reaches the minimum state of charge (see 3.7).

Between two cycles, a hot exposure process of no more than 10 minutes is allowed, and the power system during the hot exposure shall be in the off state.

6.1.1.1.5.3 Use of transmission. The vehicle operates according to the specifications of GB 18352. If the manufacturer has special requirements for gear shift, type I test's operation cycle is not applicable for the requirements of the vehicle's gear shift point, it may operate according to the requirements for the use of transmission in GB 18352, combined with the manufacturer's product instructions and operating instructions of gearbox.

6.1.1.2 Condition B test

6.1.1.2.1 Vehicle pretreatment

The vehicle is pretreated as specified in 6.1.1.1.2.

6.1.1.2.3 Vehicle preset

Before the test, the vehicle is preset (vehicle exposure) in the room with the temperature maintained at 293 K ~ 303 K (20 ~ 30 °C) before the test. The preset time is at least 6 h until the temperature of engine's lubricating oil and coolant reaches within ± 2 K of room temperature.

If the manufacturer makes a request, the test shall be carried out within 6 hours to 30 hours after the vehicle is running at the normal temperature.

6.1.1.2.4 Test procedure

6.1.1.2.4.1 The vehicle is normally started and the test shall be carried out according to the specifications of Annex C of GB 18352.

6.1.1.2.4.2 Sampling is carried out according to the specifications of GB 18352.

6.1.1.2.4.3 Carry out according to the specifications of 6.1.1.1.5.3

6.1.1.3 Test results

6.1.1.3.1 When tested according to 6.1.1.1.5.1, the weighted-mass emission of the pollutant is calculated according to equation (2).

6.1.1.3.2 When tested according to 6.1.1.1.5.2, the weighted-mass emission of the pollutant is calculated according to equation (3)

6.1.2 Off-board vehicle charging (OVC) hybrid electric vehicles with function of manual selection of driving mode

The test shall be carried out under the following conditions. […]

6.1.2.1 Condition A test

6.1.2.1.1 If the vehicle's electric range (measured according to GB/T 19753) is longer than a complete test cycle, the type I test may be carried out in electric mode at the manufacturer's request. In this case, the vehicle pretreatment in accordance with 6.1.2.1.3 may be omitted.

6.1.2.2 Condition B test

6.1.2.2.1 Vehicle pretreatment

The vehicle is pretreated according to the specifications of 6.1.1.2.1.

6.1.2.2.2 Energy storage device

The energy storage device of the vehicle shall discharge according to the specifications of 6.1.2.1.2.

6.1.2.3 Test results

According to the specifications of 6.1.1.3, calculate the weighted-mass emission Mi each pollutant of vehicles.

The emission measurement results (MAi, MBi, Mi) shall be recorded separately in the test report. The emission measurement results shall meet the corresponding emission limit requirements specified in GB18352.

6.1.3 Not off-board vehicle charging (NOVC) hybrid electric vehicles without manual selection of driving mode

6.1.3.1 According to the manufacturer's recommendations, the electrical energy state of the vehicle's energy storage device is set to ensure that the vehicle meet the specifications of 6.1.3.3 during the emission test.

6.1.3.2 Test according to GB 18352. […]

6.2.2 Free acceleration smoke test

The vehicle in the VI stage shall be carried out with the free acceleration smoke test according to the specifications of Annex D of GB 3847-2005; the vehicle after the V stage shall be carried out with the free acceleration smoke test according to the relevant specifications of GB 18352.

If there are special requirements for hybrid electric vehicles when carrying out this test, then these requirements shall be described in detail in product instructions. In addition to the device provided by the vehicle itself, this special measurement requires no other device.

6.6 Type VI test (CO and HC emission test at low temperature after cold start)

It shall test according to the specifications of type VI test in Annex H of GB 18352 and shall meet the following requirements.

6.6.1 For off-board vehicle charging hybrid electric vehicles (OVC), the measurement of emission pollutants shall be carried out under the same conditions as those specified in condition B of type I test in 6.1.1.1 and 6.1.2.2, except for 6.1.1.2.5.

6.6.2 For not off-board vehicle charging hybrid electric vehicles (NOVC), the measurement of emission pollutants shall be carried out under the same conditions as those specified in type I test, except for 6.1.3.3.

6.7 On-board diagnostics (OBD) system test

It shall test according to the relevant specifications of OBD in Annex I of GB 18352 and shall meet the following requirements. […]