GB/T 38750.2-2020 PDF EnglishUS$195.00 · In stock · Download in 9 seconds
GB/T 38750.2-2020: Reciprocating internal combustion engine energy efficiency evaluating specifications - Part 2: Gasoline engines Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedure Status: Valid
Similar standardsGB/T 38750.2-2020: Reciprocating internal combustion engine energy efficiency evaluating specifications - Part 2: Gasoline engines---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT38750.2-2020 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 ContentsForeword ... 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 engines1 ScopeThis 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 referencesThe 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 definitionsThe 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 method5.1 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)]; ......Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al. 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