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HJ 437-2008 PDF English


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HJ 437-2008: PDF in English

HJ 437-2008 National Standard for Environmental Protection of the People‘s Republic of China Technical specification for on-board diagnostic (OBD) system of compression ignition and gas fuelled positive ignition engines of vehicles ISSUED ON. JUNE, 24, 2008 IMPLEMENTED ON. JULY 01, 2008 Issued by. the Ministry of Environmental Protection [PRC] HJ Table of Contents Foreword ... 3 1 Scope ... 5 2 Normative references ... 5 3 Terms and definitions ... 6 4 Type approval and application ... 10 5 Technical requirements and test ... 12 6 Access to OBD system information ... 25 7 Production consistency ... 26 8 Extension of type approval ... 27 Annex A (Normative) Materials submitted for type approval ... 28 Annex B (Normative) Type approval test of on-board diagnosis (OBD) system ... 31 Annex D (Normative) Diagnosis signal ... 43 References and Original Chinese Documents ... 46 Foreword This Standard is formulated to implement the Environment Protection Law of the People's Republic of China and the Law of the Prevention and Control of Atmospheric Pollution of the People's Republic of China, to prevent and control the pollution of motor vehicles' emission to the environment, and to improve the environmental air quality. This Standard specifies the technical specification and test method for on-board diagnostic (OBD) system - compression ignition engines and vehicles with such engines; and positive ignition engines and vehicles with such engines which are fuelled by natural gas (NG) or liquid petroleum gas (LPG). This Standard supplements GB 17691, Limits and measurement methods for exhaust pollutants from compression ignition and gas fuelled positive ignition engines of vehicles (Ⅲ, Ⅳ, Ⅴ) with respect to the on-board diagnosis (OBD) system. For the purpose of this Standard, the modifications of technical contents ADOPT 2005/55/EEC, Directive of the European Union (EU) On the laws of the Member States relating to the measures to be taken against the emission of gaseous and particulate pollutants from compression-ignition engines for use in vehicles, and the emission of gaseous pollutants from positive-ignition engines fuelled with natural gas or liquefied petroleum gas for use in vehicles, and its revised directives 2005/78/EC and 2006/51/EC with respect to on-board diagnosis (OBD) system. For the purpose of this Standard, the Annexes A, B, C and D are normative. This Standard is issued for the first time. This Standard was organized for formulation by the Department of Scientific and Technical Standard of the Ministry of Environmental Protection of the People‘s Republic of China. The chief drafting organizations include China Automotive Technology & Research Center, Chinese Research Academy of Environmental Sciences, and Jinan Vehicle Testing Center This Standard was approved on June 24, 2008 by the Ministry of Environmental Protection of the People‘s Republic of China. This Standard shall be effective from July 1 2008. This Standard shall be interpreted by the Ministry of Environmental Protection of the People‘s Republic of China. Technical specification for on-board diagnostic (OBD) system of compression ignition and gas fuelled positive ignition engines of vehicles 1 Scope This Standard specifies the technical specification and test method for on-board diagnostic (OBD) system - compression ignition engines and vehicles with such engines; and positive ignition engines and vehicles with such engines which are fuelled by natural gas (NG) or liquid petroleum gas (LPG). This Standard applies to the type approval and production consistency inspection for the OBD system of the compression ignition (including gas fuelled positive ignition) engines; and the relevant vehicles of classes M2, M3, N1, N2 and N3 which are designed for speed greater than 25 km/h; and vehicles of class M1 which have total mass greater than 3500 kg. For N1 and N2 vehicles fitted with compression ignition (including gas fuelled positive ignition) engines, if the OBD system type approval has been made in accordance with GB 18352.3-2005, Limits and measurement methods for emissions from light-duty vehicles (Ⅲ, Ⅳ). the type approval specified in this Standard may be omitted for their engines. 2 Normative references The articles contained in the following documents have become part of this Standard through reference in this Standard. For the undated documents so quoted, the effective edition shall be applicable to this Standard. GB 17691 Limits and measurement methods for exhaust pollutants from compression ignition and gas fuelled positive ignition engines of vehicles (China III IV V Stages) GB 18352.3-2005 Limits and measurement methods for emissions from light-duty vehicles (China III IV Stages) HJ 438-2008, Durability of emission control systems of compression ignition and gas fuelled positive ignition engines of vehicles ISO 2575 Road vehicles -- symbols for controls, indicators and tell-tales ISO 15031-3 Road vehicles -- Communication between vehicle and external equipment for emissions-related diagnostics -- Part 3. Diagnostic connector and related electrical circuits, specification and use ISO 15031-4 Road vehicles -- Communication between vehicle and external equipment for emissions-related diagnostics -- Part 4. External test equipment ISO 15031-5 Road vehicles -- Communication between vehicle and external equipment for emissions-related diagnostics -- Part 5. Emissions-related diagnostic services ISO DIS 15031-6.2004 Road vehicles -- Communication between vehicle and external test equipment for emissions-related diagnostics -- Part 6. Diagnostic trouble code definitions ISO 15765-4 Road vehicles -- Diagnostics on Controller Area Networks (CAN) -- Part 4. Requirements for emissions-related systems SAE J1939 Recommended Practice for a Serial Control and Communications Vehicle Network SAE J1939-13 Off-Board Diagnostic Connector SAE J1939-73 Application Layer -- Diagnostics SAE J2012 Diagnostic Trouble Code Definitions 3 Terms and definitions For the purposes of this Standard, the terms and definitions given in GB 17691 and HJ 438-2008, Durability of emission control systems of compression ignition and gas fuelled positive ignition engines of vehicles and the following terms and definitions apply. 3.1 Defeat strategy Any of the below mentioned strategies is considered as the defeat strategy. A kind of auxiliary emission control strategy (AECS) which enables that, under reasonable and normal operating conditions, a vehicle has an emission control efficacy lower than that under the basic emission control strategy (BECS); or b) The reagent flow or the position where the reagent is injected into the exhaust after-treatment system, which shall technically ensure to be injected to the required point as practical as possible. 5.5.4.9 Within the time specified in sub-clause 5.5.4.7, if the difference between the actual average reagent consumption and theoretical one exceeds 50%, the engine system shall enable the measure specified in sub-clause 5.5.4.11. 5.5.4.10 In case of interruption of the activated metering reagent feed mechanism, the measure specified in sub-clause 5.5.4.11 shall be adopted. This measure is not required for the following circumstances. If such interruption is as needed for the engine operating conditions and as required by the engine electronic control unit (e.g. the operating condition that the engine emission performance may not need the metering reagent feed), and such engine interruption shall be the operating condition clearly specified in the document which has been submitted to the type approval body by the manufacturer. 5.5.4.11 If any malfunction of the sub-clauses 5.5.4.5, 5.5.4.9 , and 5.5.4.10 in sub-clause 5.5.4 is monitored, the same results shall be initiated in accordance with sub-clauses 5.5.3.2, 5.5.3.3, and 5.5.3.4. 5.5.5 Measures preventing the exhaust after-treatment system from being damaged 5.5.5.1 The engine system shall be provided with such a torque limiter to alert the driver of the abnormal operation of the engine system or of the vehicle driving in an incorrect way, to promote the driver to take immediate corrective actions for the malfunction, 5.5.5.2 In such instances mentioned in sub-clauses 5.5.3.4, 5.5.4.2, 5.5.4.5, 5.5.4.9, or 5.5.4.10, the torque limiter shall be activated when the speed is equal to zero. The torque limiter shall be automatically activated without any tool or push-button. 5.5.5.3 When the torque limiter is activated, the engine torque will never exceed. 60% of maximum engine torque for vehicles with N3 >16,000 kg, M1 >7,500 kg; M3/III and M3/B >7,500 kg; 75% of ma... ......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.