GB/T 5363-2025 Method of bench test of engine for motorcycles and mopeds English
1 Scope
This document describes the test conditions, performance test method, reliability test method, durability test method, effective power correction and method of bench test of engine of hybrid drive system for motorcycles and mopeds, and provides the contents of the test report.
This document is applicable to spark ignition and compression ignition engines for motorcycles and mopeds (hereinafter referred to as "engines").
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB 4569 Limit and measurement method of noise emitted by stationary motorcycles and mopeds
GB 14622 Limits and measurement methods for emissions from motorcycles (China IV)
GB 18176 Limits and measurement methods for emissions of pollutants from mopeds (China IV)
GB/T 21404-2022 Internal combustion engine - Determination and method for the measurement of engine power - General requirements
3 Terms and definitions
No terms and definitions are listed in this document.
4 Test conditions
4.1 Standard environment conditions
Standard environment conditions shall meet the relevant requirements of Clause 5 of GB 21404-2022.
4.2 Accessories
Before the test, the engine shall be equipped with all accessories under actual use conditions. If there are charging and lighting coils in the generator or magneto, they can be in a no-load state. The installed accessories shall be detailed in the corresponding test record and test report.
4.3 Determination of output power
Measure the output power from the engine crankshaft. If it is not allowed by the engine structure， the measurement shall be conducted from the corresponding output shaft of the engine, and its transmission efficiency coefficient shall comply with Table 1.
4.4 Engine adjustments
4.4.1 In type test and ex-factory test, the technical state of engine shall be adjusted at one time according to the manufacturer's regulations before the test. The adjustment conditions required for the test are shown in Table 2, and no adjustment shall be made during the performance test.
4.4.2 Regular quality inspection test and acceptance test shall be carried out according to the technical condition of the engine adjusted at the factory, and no adjustment shall be made before the test.
4.5 Installation of motor
The engine shall be installed on the test bench at the installation angle when it is used, so as to discharge the exhaust gas into the atmosphere. If the exhaust muffler of the engine is connected to the exhaust outlet system of the laboratory through the exhaust outlet pipe, the difference between the pressure generated by the exhaust outlet system of the laboratory and the atmospheric pressure shall not exceed ±740Pa.
4.6 Running-in
Running-in shall be carried out before test according to the running-in specifications specified by the manufacturer. If not specified by the manufacturer, the running-in specification shall be prepared according to the actual situation as specified in Table 3.
4.7 Cooling of motor
4.7.1 The natural air-cooled engine shall be cooled by external air source during test. The direction of cooling air shall generally be consistent with the direction of the oncoming wind borne by the engine when the vehicle is running, and the outlet area of the cooling fan shall not be less than the area of the orthogonal projection of the windward surface of the engine.
In principle, the forced air-cooled engine shall use its own cooling system during test, and the exhaust pipe, muffler and other accessories are allowed to be cooled by external air sources.
4.7.2 The water-cooled engine shall be cooled by its own cooling circulation system during test. When the radiator fails to meet the heat dissipation needs, it is allowed to increase external wind source to blow the radiator or adopt external circulation for cooling, but the circulation of coolant shall only be carried out by the engine's own water pump.
If the fan of an engine with a cooling fan cannot be installed on the tested engine, the power absorbed by the fan shall be measured at the same speed as the engine power, and the power shall be subtracted from the measured engine power.
GB/T 5363-2025 Method of bench test of engine for motorcycles and mopeds English
1 Scope
This document describes the test conditions, performance test method, reliability test method, durability test method, effective power correction and method of bench test of engine of hybrid drive system for motorcycles and mopeds, and provides the contents of the test report.
This document is applicable to spark ignition and compression ignition engines for motorcycles and mopeds (hereinafter referred to as "engines").
2 Normative references
The following documents contain provisions which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB 4569 Limit and measurement method of noise emitted by stationary motorcycles and mopeds
GB 14622 Limits and measurement methods for emissions from motorcycles (China IV)
GB 18176 Limits and measurement methods for emissions of pollutants from mopeds (China IV)
GB/T 21404-2022 Internal combustion engine - Determination and method for the measurement of engine power - General requirements
3 Terms and definitions
No terms and definitions are listed in this document.
4 Test conditions
4.1 Standard environment conditions
Standard environment conditions shall meet the relevant requirements of Clause 5 of GB 21404-2022.
4.2 Accessories
Before the test, the engine shall be equipped with all accessories under actual use conditions. If there are charging and lighting coils in the generator or magneto, they can be in a no-load state. The installed accessories shall be detailed in the corresponding test record and test report.
4.3 Determination of output power
Measure the output power from the engine crankshaft. If it is not allowed by the engine structure， the measurement shall be conducted from the corresponding output shaft of the engine, and its transmission efficiency coefficient shall comply with Table 1.
4.4 Engine adjustments
4.4.1 In type test and ex-factory test, the technical state of engine shall be adjusted at one time according to the manufacturer's regulations before the test. The adjustment conditions required for the test are shown in Table 2, and no adjustment shall be made during the performance test.
4.4.2 Regular quality inspection test and acceptance test shall be carried out according to the technical condition of the engine adjusted at the factory, and no adjustment shall be made before the test.
4.5 Installation of motor
The engine shall be installed on the test bench at the installation angle when it is used, so as to discharge the exhaust gas into the atmosphere. If the exhaust muffler of the engine is connected to the exhaust outlet system of the laboratory through the exhaust outlet pipe, the difference between the pressure generated by the exhaust outlet system of the laboratory and the atmospheric pressure shall not exceed ±740Pa.
4.6 Running-in
Running-in shall be carried out before test according to the running-in specifications specified by the manufacturer. If not specified by the manufacturer, the running-in specification shall be prepared according to the actual situation as specified in Table 3.
4.7 Cooling of motor
4.7.1 The natural air-cooled engine shall be cooled by external air source during test. The direction of cooling air shall generally be consistent with the direction of the oncoming wind borne by the engine when the vehicle is running, and the outlet area of the cooling fan shall not be less than the area of the orthogonal projection of the windward surface of the engine.
In principle, the forced air-cooled engine shall use its own cooling system during test, and the exhaust pipe, muffler and other accessories are allowed to be cooled by external air sources.
4.7.2 The water-cooled engine shall be cooled by its own cooling circulation system during test. When the radiator fails to meet the heat dissipation needs, it is allowed to increase external wind source to blow the radiator or adopt external circulation for cooling, but the circulation of coolant shall only be carried out by the engine's own water pump.
If the fan of an engine with a cooling fan cannot be installed on the tested engine, the power absorbed by the fan shall be measured at the same speed as the engine power, and the power shall be subtracted from the measured engine power.
