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GB/T 37692-2019 English PDF (GBT37692-2019)

GB/T 37692-2019 English PDF (GBT37692-2019)

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GB/T 37692-2019: Running mode specific fuel consumption limits and measurement methods for small spark ignition engines of non-road mobile machinery

This Standard specifies the running mode specific fuel consumption limits and measurement methods for small spark ignition engines of non-road mobile machinery, which use gasoline, etc. as fuel.
GB/T 37692-2019
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.020
J 91
Running mode specific fuel consumption limits and
measurement methods for small spark ignition
engines of non-road mobile machinery
ISSUED ON: JUNE 04, 2019
IMPLEMENTED ON: JANUARY 01, 2020
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 5
3 Terms and definitions ... 5
4 Technical requirements ... 6
5 Running mode specific fuel consumption measurement ... 7
Appendix A (Normative) Devices and accessories installed to determine engine power ... 8
Appendix B (Normative) Standard reference condition power correction and test procedure ... 12
Appendix C (Normative) Calculation of running mode specific fuel consumption ... 18
Appendix D (Normative) Measurement results ... 19
Table 1 -- Engine category in cm3 ... 7
Table 2 -- Running mode specific fuel consumption limits for engines ... 7 Table A.1 -- Devices and accessories installed to determine engine power ... 8
Table B.1 -- Test conditions and weight coefficients ... 15
Table D.1 -- Power absorbed by the accessories at the indicated engine
speed ... 20
Table D.2 -- Engine power in kW ... 20
Table D.3 -- Dynamometer setting value in kW ... 21
Running mode specific fuel consumption limits and
measurement methods for small spark ignition
engines of non-road mobile machinery
1 Scope
This Standard specifies the running mode specific fuel consumption limits and measurement methods for small spark ignition engines of non-road mobile machinery (hereinafter referred to as "engines"), which use gasoline, etc. as fuel.
This Standard applies to (but not limited to) the following non-road mobile machinery engines with a net power of not more than 19 kW:
- Lawn mower ;
- Chain saw;
- Generator;
- Water pump;
- Brush cutter;
- Mini-tiller;
- Rice transplanter;
- Hedgerow machine;
- Hair dryer;
- Snowplow;
- High-pressure washer;
- Vibratory plate compactor;
- Troweling machine.
This Standard does not apply to engines for the following purposes:
- Engines used to drive ships;
3.1
Fuel consumption
The amount of fuel consumed by an engine per unit time under specified
environmental conditions and specified power.
[GB/T 21404-2008, definition 3.4.1]
3.2
Specific fuel consumption
The amount of fuel consumed by an engine per unit power and unit time.
[GB/T 21404-2008, definition 3.4.1.1]
3.3
Running mode specific fuel consumption
The weighted mean of the specific fuel consumption of an engine under multiple working conditions.
3.4
Net power
The power measured from the crankshaft end or its equivalent parts, at the corresponding engine speed, when the engine is installed with engine
installation and accessories in accordance with the requirements of Table A.1 in Appendix A on the test bench.
3.5
Intermediate speed
85% of the rated speed when the engine is tested in the G1 cycle.
4 Technical requirements
4.1 Engine classification
The engine category code and corresponding working volume are shown in
Table 1. Hand-held engines are represented by "SH". Non-hand-held engines are represented by "FSH".
Appendix B
(Normative)
Standard reference condition power correction and test procedure
B.1 Reference condition power correction
B.1.1 Standard reference condition
In order to determine the power and fuel consumption of the engine, the following standard reference condition shall be used:
Total air pressure: Pr=100 kPa;
Air temperature: Tr=298 K (tr=25 ??C);
Relative humidity: ??r=30%.
B.1.2 Power correction calculation method
The power correction method shall be in accordance with the requirements in Clause 7 of GB/T 21404-2008.
B.2 Test procedure
B.2.1 Test conditions
B.2.1.1 Engine's intake system
The test engine shall be equipped with an intake system that is representative of the actual use. When the engine uses a clean air filter and operates according to the maximum intake air flow condition of the corresponding purpose, its intake resistance shall be within 110% of the upper limit specified by the manufacturing enterprise.
B.2.1.2 Engine's exhaust system
The test engine shall be equipped with an exhaust system that is representative of the actual use. When the engine is running at the maximum rated power condition for the corresponding purpose, its exhaust back pressure shall be within 110% of the upper limit specified by the manufacturing enterprise. B.2.1.3 Cooling system
The engine cooling system used shall have sufficient capacity to maintain the engine at the normal operating temperature specified by the manufacturing enterprise.
B.2.1.4 Lubricating oil
The lubricating oil, specified by the engine manufacturing enterprise for the engine and its intended use, shall be selected. The specification of lubricating oil used for engine test shall be recorded in D.1.2. And it shall be shown together with the test result.
B.2.1.5 Test fuel
It shall use gasoline that meets GB 17930 or benchmark gasoline that meets the technical requirements of GB 18352.5; or use ethanol gasoline that meets the technical requirements of GB 18351.
The fuel/lubricating oil mixture ratio of the two-stroke engine shall meet the recommended value of the manufacturing enterprise and be recorded in D.1.1. B.2.1.6 Dynamometer setting
It shall remove the accessories only needed to operate non-road mobile
machinery. Where the accessories cannot be removed, the absorbed power of these accessories shall be determined, to calculate the dynamometer setting; unless the accessories are an integral part of the engine (such as the cooling fan of an air-cooled engine).
Engine intake resistance and exhaust back pressure shall be adjusted
according to B.2.1.1 and B.2.1.2. In order to calculate the torque value of the specified test conditions, through the test, the maximum torque value at the specified test speed shall be determined. For engines that are not designed to work within the speed range of the full-load torque curve, the manufacturing enterprise shall specify the maximum torque value at the test speed. The setting value of the dynamometer under each test condition shall be calculated
according to formula (B.1):
Where:
S - The setting value of dynamometer, in kilowatts (kW);
PM - The maximum power measured under the test conditions and test speed in Appendix A or declared by the manufacturing enterprise, in kilowatts (kW); PAE - The power absorbed by the accessories declared in addition to Appendix

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