GB/T 19753-2021Test methods for energy consumption of light-duty hybrid electric vehicles (English PDF)

3.1 All-electric Range

All-electric range refers to the distance traveled by the vehicle from the start of the charge-depleting mode test to the start of the engine; the upper limit of the distance is the charge-depleting actual range.

3.2 Charge-depleting Actual Range RCDA

Charge-depleting actual range refers to the distance traveled by the vehicle from the start of the charge-depleting mode test, and through the continuous operation of multiple test cycles, until the rechargeable energy storage system (REESS) reaches a power balance.

3.3 Charge-depleting Cycle Range RCDC

Charge-depleting cycle range refers to the distance traveled by the vehicle at the end of the transition cycle, from the start of the charge-depleting mode test, and through the continuous operation of multiple test cycles, until the determination conditions of termination specified in 6.2.2.5 are reached.

4.1 Environmental Requirements and Parameters

The environmental requirements and parameters of the tests shall comply with the stipulations of C.1.2.2 in GB 18352.6-2016.

4.2 Test Equipment

4.2.1 The test equipment used for the tests shall satisfy the requirements of Appendix CD of GB 18352.6-2016.

4.2.2 The requirements for other related parameters are shown in Table 1.

4.3 Test Fuels

The type test shall be based on the minimum code recommended by the vehicle manufacturer and adopt the benchmark fuel that complies with the requirements of Appendix K of GB 18352.6-2016; additional oxygen-containing substances are prohibited in the fuel. When fuel types that are not specified in Appendix K of GB 18352.6-2016 are used, commercial vehicle fuels that comply with relevant national standards shall be used.

4.4 Test Vehicles

4.4.1 All parts and components of the test vehicle shall satisfy the requirements of mass production. If the test vehicle is different from those in mass production, a detailed explanation is required.

4.4.3 The test vehicle may by running in based on the vehicle manufacturer or its authorized agent's demands. In addition, it shall be ensured that the machinery is in good condition and the running-in mileage does not exceed 15,000 km.

4.4.4 Lubricants specified by the vehicle manufacturer shall be used and indicated in the report of test results.

4.4.5 Conduct the other settings of the test vehicle in accordance with the requirements of C.1.2.4.2 ~ C.1.2.4.5 and C.1.2.4.7 in GB 18352.6-2016.

4.5 Test Cycle

The test cycle is the Worldwide-harmonized Light vehicles Test Cycle (WLTC) Parameter

6.1 Test Requirements

6.1.2 Special requirements

for charge-sustaining mode test of off-vehicle charging hybrid electric vehicle (OVC-HEV) and test of non-off-vehicle charging hybrid electric vehicle (NOVC-HEV)

6.1.2.1 It is applicable to the forced cooling specified in C.1.2.7.2 of GB 18352.6-2016.

6.1.2.2 Test validity determination. If DeltaEREESS,CS calculated in accordance with A.1.3 of Appendix A is negative (namely, REESS is in discharge), and the cycle correction criterion c is greater than 0.01, then, the test result is invalid.

6.1.3 Test requirements under special environmental conditions

The vehicle manufacturer and its authorized agent may take the environmental settings of Appendix A,

6.2 Test Procedures

6.2.2 Separately conducted charge-depleting mode test (Option 1, test process and corresponding REESS charging state curve are shown in B.2.1 of Appendix B)

6.2.3 Separately conducted charge-sustaining mode test (Option 2, test process and corresponding REESS charging state curve are shown in B.2.2)

6.2.1 Test options

The test includes the following four options, as it is shown in Figure 1.

6.2.2.1 Pre-treatment

The vehicle shall receive pre-treatment in accordance with the stipulations of C.2.1 of Appendix C.

6.2.2.6 REESS charging and electricity measurement

6.2.2.6.2 In accordance with the relevant requirements of C.2.3.1, the electricity measurement equipment shall be installed to measure the externally charged electricity EAC and the charging time. When the requirements of C.2.3.3 are satisfied, stop the electricity measurement.

6.2.2.7 Other requirements for test results

Each cycle emission result after degradation correction and Ki (or Ki,CO2) correction shall comply with the requirements for emission limits in C.1.1.2 of GB 18352.6-2016.

The degradation coefficient or degradation correction value is determined in accordance with the requirements of 5.3.5 of GB 18352.6-2016; Ki (or Ki,CO2) is determined in accordance with Appendix Q of GB 18352.6-2016.

6.2.4 Continuously conducted

charge-depleting mode test and charge- sustaining mode test (Option 3, test process and corresponding REESS charging state curve are shown in B.2.3)

6.2.5 Continuously conducted

charge-sustaining mode test and charge- depleting mode test (Option 4, test process and corresponding REESS charging state curve are shown in B.2.4)

6.2.5.1 The charge-sustaining mode test shall be conducted in accordance with the stipulations of 6.2.3.1 ~ 6.2.3.3.

6.2.5.2 The charge-depleting mode test shall be conducted in accordance with the stipulations of 6.2.2.2 ~ 6.2.2.7.

6.3 OVC-HEV Test Procedures

The vehicle may be tested in accordance with one of the four options below.

6.4 NOVC-HEV Test Procedures

6.4.1 The test process and corresponding REESS charging state curve may take B.2.2 as a reference.

6.4.2 Pre-treatment and vehicle immersion shall be conducted in accordance with the stipulations of C.3.2 and C.3.3.

6.4.3 The test rules shall comply with the stipulations of 6.2.3.2.

6.4.4 The test procedures shall comply with the stipulations of 6.2.3.3.

7.1 OVC-HEV Test Results

7.1.1 Fuel consumption

7.1.1.1 Fuel consumption of charge-depleting mode test

7.1.1.1.2 In accordance with Formula (4), calculate the fuel consumption of the charge- depleting mode test.

7.1.1.1.1 Calculation process

In accordance with the sequence of Table 3, perform calculations. Record all results in the "Output" column. The annotations of symbols used in the formulas of this Table are as follows.

7.1.1.2 Fuel consumption of charge-sustaining mode test

7.1.1.2.2 If the test result satisfies the conditions of A.1.2.3, then, no correction is needed; the fuel consumption shall be determined in accordance with Formula (5) and Formula (6).

7.1.1.2.3 If the test result satisfies the conditions of A.1.2.2, then, the fuel consumption needs to be corrected. On the premise of compliance with the conditions of A.2.2, in accordance with A.2.3, determine the fuel consumption correction factor; then, determine in accordance with Formula (7) and Formula (8).

7.1.1.2.1 Calculation process

In accordance with the sequence of Table 4, perform calculations. Record all results in the "Output" column. The annotations of symbols used in the formulas of this Table are as follows.

7.1.1.3 OVC-HEV fuel consumption

Combine the calculation results of 7.1.1.1 and 7.1.1.2; in accordance with Formula (9), calculate OVC-HEV fuel consumption.

7.1.1.4 Converted fuel consumption

The vehicle manufacturer may calculate the vehicle's converted fuel consumption as needed in accordance with G.

7.1.2 Electricity consumption

7.1.2.1 Electricity consumption of charge-depleting mode test

In accordance with the stipulations of 6.2.2.6 and Formula (10), calculate electricity consumption of charge-depleting mode test.

7.1.2.2 OVC-HEV electricity consumption

OVC-HEV electricity consumption shall be calculated in accordance with Formula (13).

7.3 Determination of Type Approval Value

7.3.1 Test description

7.3.1.1 The number of tests shall be determined in accordance with Figure 2.

7.3.1.2 The procedures specified in Figure 2 are applicable to a complete test cycle but not applicable to a single speed section of the test cycle.

7.3.1.3 The test results are corrected by REESS electrical energy changes and Ki.

Figure 2 -- Flow Chart of Determination of Type Approval Value

7.3.2 Determination of test results

7.3.2.1 The vehicle manufacturer shall declare the results of the test vehicle throughout the test cycle in accordance with Table 5.

7.3.3 Fuel consumption of each speed section of charge-sustaining mode test

7.3.3.1 In the charge-sustaining mode test, if the type approval value FCCS uses the comprehensive value declared by the vehicle manufacturer, then, the type approval value of fuel consumption of each speed section shall be the result of the arithmetic mean value FCCS,p,avg of fuel consumption of each speed section determined through Formula (6) or Formula (8) multiplied by the adjustment factor FC_AF determined by Formula (18) and Formula (19).

7.3.5 OVC-HEV electricity consumption

In accordance with Formula (21), calculate the type approval value of OVC-HEV electricity consumption.

8.1 Interpolation Conditions

8.1.1 The interpolation method can only be used when the stipulations of C.1.2.3.1.1 in GB 18352.6-2016 are satisfied.

8.1.5 Requirements for vehicle M. Vehicle M belongs to the interpolation lineage composed of vehicle H and vehicle L. The fuel consumption of vehicle M under the charge-sustaining mode shall be calculated in accordance with Step 6 in Table 4.The difference of fuel consumption between vehicle H and vehicle M, and vehicle M and vehicle L under the charge-sustaining mode shall be not greater than the calculation result of Formula (22), see Figure 5.The road load factor and test mass of vehicle M shall be recorded.

8.1.6 In accordance with the vehicle manufacturer's recommendations, vehicle H may be selected to represent all vehicle models in the interpolation lineage for the tests.

8.1.7 Special requirements of adopting the interpolation method to calculate OVC-HEV test results. In accordance with the stipulations of 8.4.1.1, 8.4.1.3, 8.4.2 and 8.4.3,

8.2 Energy Demand for Vehicles in a Certain Speed Section

In the interpolation lineage, the energy demand of a vehicle in the speed section p shall be calculated in accordance with the stipulations of CE.5 in GB 18352.6-2016.The road load factor and mass involved in the calculation process shall be determined in accordance with CE.3.2.3.2.3 in GB 18352.6-2016.

8.3 Interpolation Coefficient of a Certain Speed Section

The interpolation coefficient of a vehicle in the speed section p shall be calculated in accordance with Formula (25).

8.4 OVC-HEV Test Results Calculated through Interpolation Method

8.4.2 Electricity consumption

8.4.2.1 Electricity consumption of charge-depleting mode test

The electricity consumption of the charge-depleting mode test of a certain vehicle shall be calculated in accordance with Formula (29).

8.4.2.2 Electricity consumption of a certain vehicle

The electricity consumption of a certain vehicle shall be calculated in accordance with Formula (30).

8.4.3 Actual range

8.4.3.1 All-electric range

The all-electric range of a certain vehicle shall be calculated in accordance with Formula (31).

8.5 NOVC-HEV Test Results Calculated through Interpolation Method

In accordance with the stipulations of 8.4.1.2, determine the fuel consumption of a certain NOVC-HEV.

8.6 Road Load Lineage and Road Load Matrix Lineage

If vehicles satisfy the requirements of C.1.2.3.1.2 in GB 18352.6-2016, they may constitute the same road load lineage; if vehicles satisfies the requirements of C.1.2.3.1.3 in GB 18352.6-2016, they may constitute the same road load matrix lineage. In accordance with the vehicle manufacturer's requirements, adopt one of the following two methods to determine the road load of vehicles in the test lineage.

9.1 General Rules

9.1.1 The vehicle manufacturer shall establish and implement a production conformity assurance scheme in accordance with 9.2.

9.1.2 In accordance with 9.3 and 9.4, determine whether the conformity of production satisfies the requirements. If a certain vehicle model cannot satisfy any requirement of the production conformity inspection, then, it shall be determined that this vehicle model does not satisfy the requirements of production conformity stipulated in this document.

9.1.3 Foe vehicles undergoing the production conformity inspection, the test settings shall be consistent with the type approval inspection specified in Chapter 7: The vehicle preparation before the test shall be performed in accordance with the recommendations of the vehicle manufacturer.

9.3 OVC-HEV Production Conformity

9.3.1 In terms of the fuel consumption FCCD determined in accordance with 7.1.1.1 and the fuel consumption FCCS determined in accordance with 7.1.1.2, the production conformity inspection and the requirements shall comply with the relevant stipulations of 8.1.2 ~ 8.3.5 in GB/T 19233-2020.

9.3.2 In terms of the fuel consumption ECAC,CD determined in accordance with 7.1.2.1, the production conformity inspection and the requirements shall comply with the relevant stipulations of 8.1.2 ~ 8.3.5 in GB/T 19233-2020.In terms of the fixed gradient coefficient specified in 8.1.3.4 in this document, when determining the production conformity in electricity consumption, 0.96 shall be adopted.

9.4 NOVC-HEV Production Conformity

In terms of the fuel consumption FCCS determined in accordance with 7.1.1.2, the production conformity inspection and the requirements shall comply with the relevant stipulations of 8.1.2 ~ 8.3.5 in GB/T 19233-2020.