QC/T 1130-2021Fuel consumption test methods for methanol vehicles (English PDF)

3.1 Methanol fuel vehicle

M and N category vehicles equipped with methanol single-fuel engines or diesel/methanol dual-fuel engines (referred to as methanol vehicles).

3.2 Light-duty methanol fuel vehicle

M1, M2 and N1 category methanol vehicles with the maximum design total mass not exceeding 3 500kg (referred to as light-duty methanol vehicles).

3.3 Heavy-duty methanol fuel vehicle

M and N category methanol vehicles with maximum design total mass exceeding 3500kg (referred to as heavy-duty methanol vehicles).

4.1 General requirements

The test requirements for light-duty methanol vehicles shall comply with the relevant provisions of GB/T 19233. The automobile manufacturer or its authorized agent can refer to the relevant provisions of GB/T 19233 to measure the vehicle's fuel consumption in the low-temperature environment, air-conditioning and refrigeration status, and high-altitude environment.

The test requirements for heavy-duty methanol vehicles shall comply with the relevant provisions of GB/T 27840.

4.2 Other requirements

Before the test, the manufacturer or its authorized agent shall provide the inspection agency with a control strategy during the engine start-up process, so that it can measure gasoline or diesel fuel consumption and methanol fuel consumption according to the engine control strategy, respectively.

5.1 Test environment, test vehicles and running-in

The test conditions for light-duty methanol vehicles shall comply with the relevant provisions of GB/T 19233; the test conditions for heavy-duty methanol vehicles shall comply with the relevant provisions of GB/T 27840.

a) The installation of a fuel flow recording device shall not affect the normal operation of the engine;

b) The fuel supply pipeline needs to be equipped with two valve systems or two sets of test equipment with only a single valve to ensure that methanol fuel, gasoline fuel or diesel fuel flow from the normal fuel supply pipeline to the corresponding measurement pipeline. The operation time for changing the fuel direction shall not exceed 0.2s;

c) A mass flow meter that meets the requirements (or similar principles) of GB/T 31130 shall be used, with a measurement accuracy of ±1% or a volume flow meter with a measurement accuracy of no less than ±0.5%;

d) The flow meter shall not make, the change OF fuel pressure and temperature at the inlet OF the methanol fuel and gasoline or diesel fuel recording device on the vehicle, exceeding 10% and ±5°, respectively.

7.2.1 Using mass flow meters to determine fuel consumption

When using a mass flow meter, the fuel consumption is calculated according to the following Formula:

F1,equ. - consumption of the equivalent fuel , in L/100km; mi - the measured value of gasoline and diesel consumption (mass) during the test, in kg; mM - the measured value of methanol consumption (mass) during the test, in kg; d - driving mileage of the test, in km;

rho_i - density of benchmark gasoline and diesel fuel at the standard temperature of 20°C (293K), in kg/L; qi - low heating value of benchmark gasoline and diesel, taking the fixed value of

1) When calculating the equivalent gasoline or diesel consumption in GB 27999-2019, it shall be multiplied by 0.75. 43.070MJ/kg for the gasoline, and the fixed value of 42.652MJ/kg for the diesel; qM - low heating value of methanol, taking the fixed value of 19.569MJ/kg.

Vi - the measured value of the consumption (volume) of benchmark gasoline and benchmark diesel, in L;

VM - the measured value of the consumption (volume) of methanol, in L;

- volume expansion coefficient of the benchmark gasoline and diesel fuel, 1.0×10- 3/°C;

- volume expansion coefficient of methanol fuel, 1.2 x 10^-3/°C; T0 - benchmark temperature, 20°C;

rho_i - density of benchmark gasoline and diesel fuel at the standard temperature of 20°C (293K), in kg/L;

rho_M - density of methanol fuel at the standard temperature of 20°C (293K), in kg/L; qi - low heating value of benchmark gasoline and diesel, taking the fixed value of 43.070MJ/kg for the gasoline, and the fixed value of 42.652MJ/kg for the diesel; qM - low heating value of methanol, taking the fixed value of 19.569MJ/kg.

Ti - average temperature of gasoline and diesel fuel, in °C (When recording manually, it shall be the arithmetic mean of the fuel temperature taken on the volume measuring device at the beginning and end of each test. When recording with an automatic acquisition system, it shall be the arithmetic mean of the recorded results);

TM - average temperature of methanol, in °C (When recording manually, it shall be the arithmetic mean of the fuel temperature taken on the volume measuring device at the beginning and end of each test. When recording with an automatic acquisition system, it shall be the arithmetic mean of the recorded results); d - driving mileage of the test, in km.