GB/T 38750.2-2020 English PDF (GB/T38750.2-2020)

GB/T 38750.2-2020: Reciprocating internal combustion engine energy efficiency evaluating specifications - Part 2: Gasoline engines
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GB/T 38750.2-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.020
J 91
Reciprocating internal combustion engine energy
efficiency evaluating specifications - Part 2: Gasoline
engines
ISSUED ON: APRIL 28, 2020
IMPLEMENTED ON: NOVEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Technical requirements ... 5 
5 Measurement method ... 7 
Appendix A (Normative) Auxiliary devices and accessories for general gasoline
engine net power measurement ... 12 
Reciprocating internal combustion engine energy
efficiency evaluating specifications - Part 2: Gasoline
engines
1 Scope
This Part of GB/T 38750 specifies the energy efficiency evaluating
specifications and measurement methods for light-duty vehicle gasoline
engines and general gasoline engines below 30 kW.
This Part applies to light-duty vehicle (including light passenger vehicle and light
commercial vehicle) gasoline engines and general gasoline engines below 30
kW.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 8190.4-2010, Reciprocating internal combustion engines - Exhaust
emission measurement - Part 4: Steady-state test cycles for different engine
applications
GB 17930, Gasoline for motor vehicles
GB/T 18297-2001, Performance test code for road vehicle engines
GB 18351-2017, Ethanol gasoline for motor vehicles (E10)
GB 26133-2010, Limits and measurement methods for exhaust pollutants
from small spark ignition engines of non-road mobile machinery (I, II)
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1 Light-duty vehicle
M1, M2 and N1 vehicles (including light passenger vehicles and light
commercial vehicles) whose maximum total mass does not exceed 3 500 kg.
5 Measurement method
5.1 Test conditions
The accuracy and measurement position of the measuring instrument of the
light-duty vehicle gasoline engine are in accordance with the provisions of
Chapter 4 in GB/T 18297-2001; the general test conditions are in accordance
with the provisions of Chapter 6 in GB/T 18297-2001; the accessories that are
attached to the engine during the measurement shall be in accordance with the
regulations in Chapter 7 of GB/T 18297-2001; the calibration value of the
gasoline engine parameters is consistent with the calibration value during
emission measurement. The accuracy of general gasoline engine measuring
instruments and equipment is in accordance with the requirements of Appendix
BA in GB 26133-2010; the resistance of the intake and exhaust system shall be
within 110% of the upper limit that is specified by the manufacturer; the
accessories for the general gasoline engine net power measurement are in
accordance with Appendix A.
5.2 Test fuel
The fuel for the testing of light-duty vehicle gasoline engines is in accordance
with the provisions of the test fuel in the current national valid light-duty vehicle
pollutant emission standards. The fuel for the testing of general gasoline
engines shall be in accordance with the gasoline that is specified in GB 17930,
or in accordance with the reference gasoline that is specified in current valid
light-duty vehicle pollutant emission limit and measurement method national
standards, or uses ethanol gasoline that complies with GB 18351-2017.
The two-stroke general gasoline engine fuel/lubricant mixing ratio shall meet
the manufacturer's recommended value and be recorded.
5.3 Test cycle
5.3.1 Light-duty vehicle gasoline engines measure the fuel consumption per
hour under the five working conditions that are specified in Table 4.
Table 4 -- Test cycle for the average fuel consumption rate test of the
light-duty vehicle gasoline engines under 5 working conditions
Gasoline engine working
condition number
Gasoline engine speed
r/min
Average effective pressure of
gasoline engine
MPa
Idle speed
-- Hedge trimmer;
-- Sprayer;
-- Trimmer;
-- Vacuum equipment.
5.4 Test measurement
After the light-duty vehicle gasoline engine reaches the steady state that is
specified by the manufacturer under each test working condition, at least
measure power, torque, speed, fuel consumption per hour, ambient
temperature and pressure twice, and take the average value as the measured
value under this working condition. The difference between the two measured
values of torque and fuel consumption per hour does not exceed 2%. When
measuring the data, the difference between the engine operating speed and
the selected speed does not exceed 1% or ±10 r/min.
The general gasoline engine G1, G2 or G3 test cycle shall be implemented in
order of increasing working condition number. The sampling time of each
working condition shall be at least 180 s; the fuel consumption shall be
measured and recorded in the last 120 s of the respective sampling period.
Before the measurement of each working condition, it shall last long enough,
so as to allow the engine to reach a thermally stable state. The thermal stability
criterion is proposed by the manufacturer. If it is not proposed, it shall meet the
level that the spark plug gasket temperature change value is less than 10 °C
within 3 min. The duration of the working condition shall be recorded and
reported.
5.5 Calculation of average fuel consumption rate of light-duty vehicle
gasoline engine under 5 working conditions
When the gasoline engine is measured in a non-standard environment, its fuel
consumption rate is not corrected.
The average fuel consumption rate ge of the gasoline engine under 5 working
conditions is calculated according to Formula (1):
Where:
ge – average fuel consumption rate under 5 working conditions, in grams per
kilowatt hour [g/(kW·h)];
GB/T 38750.2-2020
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.020
J 91
Reciprocating internal combustion engine energy
efficiency evaluating specifications - Part 2: Gasoline
engines
ISSUED ON: APRIL 28, 2020
IMPLEMENTED ON: NOVEMBER 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Terms and definitions ... 4 
4 Technical requirements ... 5 
5 Measurement method ... 7 
Appendix A (Normative) Auxiliary devices and accessories for general gasoline
engine net power measurement ... 12 
Reciprocating internal combustion engine energy
efficiency evaluating specifications - Part 2: Gasoline
engines
1 Scope
This Part of GB/T 38750 specifies the energy efficiency evaluating
specifications and measurement methods for light-duty vehicle gasoline
engines and general gasoline engines below 30 kW.
This Part applies to light-duty vehicle (including light passenger vehicle and light
commercial vehicle) gasoline engines and general gasoline engines below 30
kW.
2 Normative references
The following documents are indispensable for the application of this document.
For dated references, only the dated version applies to this document. For
undated references, the latest edition (including all amendments) applies to this
document.
GB/T 8190.4-2010, Reciprocating internal combustion engines - Exhaust
emission measurement - Part 4: Steady-state test cycles for different engine
applications
GB 17930, Gasoline for motor vehicles
GB/T 18297-2001, Performance test code for road vehicle engines
GB 18351-2017, Ethanol gasoline for motor vehicles (E10)
GB 26133-2010, Limits and measurement methods for exhaust pollutants
from small spark ignition engines of non-road mobile machinery (I, II)
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1 Light-duty vehicle
M1, M2 and N1 vehicles (including light passenger vehicles and light
commercial vehicles) whose maximum total mass does not exceed 3 500 kg.
5 Measurement method
5.1 Test conditions
The accuracy and measurement position of the measuring instrument of the
light-duty vehicle gasoline engine are in accordance with the provisions of
Chapter 4 in GB/T 18297-2001; the general test conditions are in accordance
with the provisions of Chapter 6 in GB/T 18297-2001; the accessories that are
attached to the engine during the measurement shall be in accordance with the
regulations in Chapter 7 of GB/T 18297-2001; the calibration value of the
gasoline engine parameters is consistent with the calibration value during
emission measurement. The accuracy of general gasoline engine measuring
instruments and equipment is in accordance with the requirements of Appendix
BA in GB 26133-2010; the resistance of the intake and exhaust system shall be
within 110% of the upper limit that is specified by the manufacturer; the
accessories for the general gasoline engine net power measurement are in
accordance with Appendix A.
5.2 Test fuel
The fuel for the testing of light-duty vehicle gasoline engines is in accordance
with the provisions of the test fuel in the current national valid light-duty vehicle
pollutant emission standards. The fuel for the testing of general gasoline
engines shall be in accordance with the gasoline that is specified in GB 17930,
or in accordance with the reference gasoline that is specified in current valid
light-duty vehicle pollutant emission limit and measurement method national
standards, or uses ethanol gasoline that complies with GB 18351-2017.
The two-stroke general gasoline engine fuel/lubricant mixing ratio shall meet
the manufacturer's recommended value and be recorded.
5.3 Test cycle
5.3.1 Light-duty vehicle gasoline engines measure the fuel consumption per
hour under the five working conditions that are specified in Table 4.
Table 4 -- Test cycle for the average fuel consumption rate test of the
light-duty vehicle gasoline engines under 5 working conditions
Gasoline engine working
condition number
Gasoline engine speed
r/min
Average effective pressure of
gasoline engine
MPa
Idle speed
-- Hedge trimmer;
-- Sprayer;
-- Trimmer;
-- Vacuum equipment.
5.4 Test measurement
After the light-duty vehicle gasoline engine reaches the steady state that is
specified by the manufacturer under each test working condition, at least
measure power, torque, speed, fuel consumption per hour, ambient
temperature and pressure twice, and take the average value as the measured
value under this working condition. The difference between the two measured
values of torque and fuel consumption per hour does not exceed 2%. When
measuring the data, the difference between the engine operating speed and
the selected speed does not exceed 1% or ±10 r/min.
The general gasoline engine G1, G2 or G3 test cycle shall be implemented in
order of increasing working condition number. The sampling time of each
working condition shall be at least 180 s; the fuel consumption shall be
measured and recorded in the last 120 s of the respective sampling period.
Before the measurement of each working condition, it shall last long enough,
so as to allow the engine to reach a thermally stable state. The thermal stability
criterion is proposed by the manufacturer. If it is not proposed, it shall meet the
level that the spark plug gasket temperature change value is less than 10 °C
within 3 min. The duration of the working condition shall be recorded and
reported.
5.5 Calculation of average fuel consumption rate of light-duty vehicle
gasoline engine under 5 working conditions
When the gasoline engine is measured in a non-standard environment, its fuel
consumption rate is not corrected.
The average fuel consumption rate ge of the gasoline engine under 5 working
conditions is calculated according to Formula (1):
Where:
ge – average fuel consumption rate under 5 working conditions, in grams per
kilowatt hour [g/(kW·h)];