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\nLimits and measurement methods for exhaust pollutants from gasoline engines of heavy-duty vehicles (III IV)<\/p>\n
<\/p>\n
1 Scope<\/p>\n
This standard specifies emission limit and measurement method and technical requirements and testing method for on-board diagnostics (OBD) system of gasoline engines for heavy-duty vehicles and automotive vehicles.<\/p>\n
This standard is applicable to type approval, manufacture conformity inspection and vehicle-engine compliance inspection of gasoline engine for motor vehicle of category M2, M3, N2 and N3 and M1 having a gross mass larger than 3500 kg, whose design vehicle speed is larger than 25 km\/h, as well as vehicles equipped with them.<\/p>\n
If category M2 vehicles equipped with gasoline engine have been applied with type approval according to the requirements of GB 18352.3-2005, the engines for the vehicles of such category may not be typed approved according to this Standard.<\/p>\n
2 Normative References<\/p>\n
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. For undated references, the latest edition of the normative document referred to applies.<\/p>\n
GB\/T 15089-2001 Classification of power-driven vehicles and trailers<\/p>\n
GB\/T 17692-1999 Measurement methods of net power for automotive engines<\/p>\n
GB 17930 Unleaded petrol (gasoline) for motor vehicles<\/p>\n
GB 18285-2005 Limits and measurement methods for exhaust pollutants from vehicles equipped ignition engine under two-speed idle conditions and simple driving mode conditions<\/p>\n
GB 18352.3-2005 Limits and measurement methods for emissions from light-duty vehicles (\u2162, IV China)<\/p>\n
GB 20890-2007 Test Procedures and Requirement of Durability of Emission Control Systems for Heavy-duty Vehicles<\/p>\n
ISO 16183 Heavy duty engines — Measurement of gaseous emissions from raw exhaust gas and of particulate emissions using partial flow dilution systems under transient test conditions<\/p>\n
ISO 16185 Road vehicles — Engine families for certification of heavy-duty vehicles by Exhaust emission<\/p>\n
3 Terms and Definitions<\/p>\n
For the purposes of this standard, the following terms and definitions apply.<\/p>\n
3.1 gaseous pollutant<\/p>\n
Carbon monoxide (CO), hydrocarbon (HC), (assuming C-H ratio for gasoline engine as C1H1.85 ) and nitric oxides (NOx, expressed in NO2 equivalent)<\/p>\n
3.2 test cycle<\/p>\n
Program of test that the engine is tested at the required rotation rate and torsion moment runs in transient state working condition<\/p>\n
3.3 type approval of engine (or engine series)<\/p>\n
Approval of engine (or engine series) type by exhaust pollutant emission level<\/p>\n
3.4 gasoline engine<\/p>\n
Gasoline-fueled positive ignition (P.I.) engine<\/p>\n
3.5 engine type<\/p>\n
Engine of same category without difference in basic characteristics, listed in Appendix A<\/p>\n
3.6 engine series<\/p>\n
A group of engines designed by the manufacturer according to Appendix AB, which has similar exhaust emission characteristic; all engines in same series shall satisfy corresponding emission limits<\/p>\n
3.7 source engine<\/p>\n
The engine, selected from a engine series, which can reflect emission characteristics of this engine series in behalf<\/p>\n
3.8 net power<\/p>\n
The power measured at engine crankshaft end point or equivalent component by the power measurement method specified in GB\/T 17692-1999 on the bedstand<\/p>\n
3.9 maximum net power (Pmax)<\/p>\n
The maximum net power applied in the type approval application by the manufacturer<\/p>\n
3.10 load percentage<\/p>\n
The maximum torsion percentage accomplished by an engine at a certain rotation rate<\/p>\n
3.11 transient state cycle of heavy-duty gasoline engine<\/p>\n
1830 test cycles stated in Article 7.2 of this Standard, which change working condition by second. This test cycle is to adopt the hormalized rotation rate – time and torsion moment – time date of the engines listed in Appendix BB, and convert them to the actual rotation rate – time and torsion moment – time series of the test engine by the method specified in Appendix BA<\/p>\n
3.12 working speed range of engine<\/p>\n
Most common engine speed range of the engine in actual work specified in Appendix B of this Standard, which ranges between maximum net-power rotation rate and idling rotation rate<\/p>\n
3.13 maximum net-power rotation rate (nPmax)<\/p>\n
Rotation rate of the engine when it gives the maximum net power<\/p>\n
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ChinaAutoRegs|GB 14762-2008\u82f1\u6587\u7248 \u91cd\u578b\u8f66\u7528\u6c7d\u6cb9\u53d1\u52a8\u673a … \u7ee7\u7eed\u9605\u8bfb