Detail of GB 17691-2018

Introduction of GB 17691-2018

Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative. This standard is formulated with a view to implementing the Environmental protection law of the People's Republic of China and the Law of the People's Republic of China on the prevention and control of atmospheric pollution, preventing and controlling the environmental pollution caused by the exhaust of vehicles equipped with compression-ignition and gas fuelled positive ignition engines, and improving the air quality. This standard specifies the emission limits and measurement methods for gaseous and particulate pollutants from vehicles (CHINA VI) equipped with compression-ignition engines and their engines as well as those for gaseous pollutants from vehicles equipped with natural gas or liquefied petroleum gas fuelled positive ignition engines and their engines. This standard is applicable to the type test, checking of conformity of production, newly produced vehicle emission supervision inspection and in-service conformity inspection on vehicles of categories M2, M3, N1, N2 and N3 equipped with compression-ignition engines and gas fuelled positive ignition engines and vehicles of category M1 with a total mass exceeding 3,500kg as well as their engines. The following main technical changes have been made with respect to GB 17691-2005 Limits and measurement methods for exhaust pollutants from compression ignition and gas fueled positive ignition engines of vehicles (III, IV, V): ——the stricter limits for exhaust pollutants are specified, the emission limits for particle numbers are added, and the pollutant emission test cycle is changed; ——the non-standard cycle emission test requirements and limits (WNTE) are added; ——the emission test requirements and limits for complete vehicle on actual road (PEMS) are added; ——the durability requirements are improved; ——the provisions on emission warranty period are added; ——the technical requirements for monitoring items, thresholds and monitoring conditions of on-board diagnostic system are revised; ——the requirements for the position and orientation of exhaust pipe orifice are added; ——the NOx emission concentration requirements for valid data of actual driving conditions are added; ——the requirement to reduce the emission of NOx from the original engine is added; ——the inspection and determination methods of production conformity and in-service conformity are revised; ——the regulatory requirements for newly produced vehicles are added; ——the type test requirements for dual-fuel engines are added; ——the type test requirements for replacement pollution control device are added. The technical content of this standard mainly refers to the relevant provisions of Regulation No.49 of the United Nations Economic Commission for Europe (UNECE) - Uniform provisions concerning the measures to be taken against the emission of gaseous and particulate pollutants from compression-ignition engines and positive ignition engines for use in vehicles. Annexes A, C, D, E, F, G, H, I, J, K, L, M, N, O, P and Q are normative, and Annex B is informative herein. The specific requirements for emission of carbon dioxide (CO2) will be released in due course. This standard replaces GB 17691-2005 Limits and measurement methods for exhaust pollutants from compression ignition and gas fueled positive ignition engines of vehicles (III, IV, V) and the contents of gas fuelled positive ignition engines in GB 11340-2005 Limits and measurement methods for crankcase pollutants from heavy-duty vehicles equipped with P.I engines from the implementation date hereof. This standard is formulated by the Department of Air Environment and the Department of Science, Technology and Standards of the Ministry of Ecology and Environment. This standard was approved by the Ministry of Ecology and Environment on May 22, 2018. From the issue date of this standard, type test may be carried out according to this standard. All gas-fuelled vehicles, urban vehicles and diesel fuelled heavy-duty vehicles produced, imported, sold and registered shall meet the requirements of this standard from July 1, 2019, July 1, 2020 and July 1, 2021, respectively. From the issue date of this standard, all relevant local standards shall be null and void. The Ministry of Ecology and Environment is responsible for the explanation of this standard. Limits and measurement methods for emissions from diesel fuelled heavy-duty vehicles (CHINA VI) 1 Application scope This standard specifies the emission limits and measurement methods for gaseous and particulate pollutants from vehicles equipped with compression-ignition engines and their engines as well as those for gaseous pollutants from vehicles equipped with natural gas (NG) or liquefied petroleum gas (LPG) fuelled positive ignition engines and their engines. This standard is applicable to the type test, checking of conformity of production, newly produced vehicle emission supervision inspection and in-service conformity inspection of vehicles of categories M2, M3, N1, N2 and N3 equipped with compression-ignition engines and gas fuelled positive ignition engines and vehicles of category M1 with a total mass exceeding 3,500kg as well as their engines. The type test of a complete vehicle given under this standard may be extended to its variants and versions with a reference mass above 2,380kg. The vehicles of categories M1, M2, N1 and N2 equipped with compression-ignition engines and gas fuelled positive ignition engines which have been subjected to type test in accordance with GB 18352.6-2016 may not be subjected to type test in accordance with this standard. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this standard. For dated references, only the edition cited applies. For undated references, the latest edition of the normative document applies. GB/T 2624 Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full (IDT ISO 5176) GB/T 3730.2 Road vehicle - Masses - Vocabulary and codes GB/T 8190.1 Reciprocating internal combustion engines - Exhaust emission measurement - Part 1: Test-bed measurement of gaseous and particulate exhaust emissions GB/T 15089 Classification of power-driven vehicles and trailers GB/T 17692 Measurement methods of net power for automotive engines GB 18047 Compressed natural gas as vehicle fuel GB 18352.6-2016 Limits and measurement methods for emissions from light-duty vehicles (CHINA 6) GB/T 19001 Quality management systems GB/T 27840 Fuel consumption test methods for heavy-duty commercial vehicles GB 30510 Fuel consumption limits for heavy-duty commercial vehicles ISO 5725 Accuracy (trueness and precision) of measurement methods and results ISO 7000 Graphical symbols for use on equipment - Index and synopsis ISO 13400 Road vehicles - Diagnostic communication over Internet Protocol (DoIP) ISO 15031 Road vehicles - Communication between vehicle and external equipment for emissions-related diagnostics 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 15031-7 Road vehicles - Communication between vehicle and external equipment for emissions-related diagnostics - Part 7: Data link security ISO 15765-4 Road vehicles - Diagnostic communication over Controller Area Network (DoCAN) - Part 4: Requirements for emissions-related systems ISO 27145 Road vehicles - Implementation of World-Wide Harmonized On-Board Diagnostics (WWH-OBD) communication requirements SAE J1708 Serial data communication between microcomputer systems in heavy-duty vehicle applications SAE J1939 Commercial Vehicle Control System Area Network (CAN) communication protocol SAE J1939-13 Off-board diagnostic connector SAE J1939-73 Application layer - Diagnostics SAE J2186 EE data link security ASTM E 29-06B Practice for using significant digits in test data to determine conformance with specifications ASTM F 1471-93 Test method for air cleaning performance of a high-efficiency particulate air-filter system EN 1822-1 High efficiency air filters (EPA, HEPA and ULPA) - Part 1: Classification, performance testing, marking 3 Terms and definitions For the purposes of this standard, the following terms and definitions apply. 3.1 aging cycle the vehicle or engine operation (speed, load, power) to be executed during the durability operation test 3.2 engine (engine family) type test the type approval test of new product that is expected to be put on the market after completion of the design of an engine type (engine family) to verify whether the product meets the technical requirements of this standard 3.3 vehicle type test the type approval test of new trial-manufactured product after completion of a vehicle type design to verify whether the product meets the technical requirements of this standard 3.4 auxiliary emission strategy, AES an emission strategy that becomes active and replaces or modifies a base emission strategy for a specific purpose and in response to a specific set of ambient and/or operating conditions and only remains operational as long as those conditions exist 3.5 base emission strategy, BES an emission strategy that is active throughout the speed and load operating range of the engine unless an AES is activated 3.6 continuous regeneration the regeneration process of an exhaust after-treatment system that occurs either permanently or at least once per World Harmonised Transient Cycle (WHTC) hot test 3.7 crankcase the spaces in, or external to, an engine which are connected to the oil sump by internal or external ducts through which gases and vapours can be emitted 3.8 critical emission-related components the following components which are designed primarily for emission control: fuel supply system, intake system, exhaust after-treatment system, the engine electronic control unit (ECU) and its associated sensors and actuators, and the exhaust gas recirculation system (EGR) including all related filters, coolers, control valves and tubing 3.9 critical emission-related maintenance the maintenance to be performed on critical emission-related components 3.10 defeat strategy an emission strategy that does not meet the performance requirements for a base or auxiliary emission strategy as specified in this standard 3.11 deNOx system an exhaust after-treatment system designed to reduce emissions of oxides of nitrogen (NOx) (e.g. passive and active lean NOx catalysts, NOx absorbers and selective catalytic reduction (SCR) systems) 3.12 diagnostic trouble code, DTC a numeric or alphanumeric identifier which identifies or labels a malfunction 3.13 element of design any element of the engine system; any control system, including: ECU software; electronic control systems; and computer logic; any control system calibration; the results of any interaction of systems 3.14 emission control monitoring system the system that ensures correct operation of the NOx control measures implemented in the engine system according to the requirements of Annex G; the emission control system means the elements of design and emission strategies developed or calibrated for the purpose of controlling emissions 3.15 emission related maintenance the maintenance which substantially affects emissions or which is likely to affect emissions deterioration of the vehicle or the engine during normal in-use operation 3.16 emission strategy an element or set of elements of design that is incorporated into the overall design of an engine system or vehicle and used in controlling emissions 3.17 engine after-treatment system family a manufacturer’s grouping of engines that comply with the definition of engine family, but which are further grouped into engines utilising a similar exhaust after-treatment system 3.18 engine family a manufacturer’s grouping of engines which through their design, as defined in Clause 8 of this standard, have similar exhaust emission characteristics 3.19 engine system the engine, the emission control system and the communication interface (hardware and messages) between the engine system electronic control unit or units (ECU) and any other powertrain or vehicle control unit 3.20 engine start consists of the ignition-On, cranking and start of combustion, and is completed when the engine speed reaches 150r/min below the normal, warmed-up idle speed 3.21 engine type a category of engines which do not differ in essential engine characteristics as set out in Annex A 3.22 exhaust after-treatment system a catalyst (oxidation, 3-way or any other), particulate filter, deNOx system, combined deNOx particulate filter, or any other emission reducing device, that is installed downstream of the engine 3.23 gaseous pollutants the exhaust gas emissions of carbon monoxide (CO), nitrogen oxides [NOx, expressed in nitrogen dioxide (NO2) equivalent], hydrocarbons [HC, i.e. total hydrocarbons (THC), non-methane hydrocarbons (NMHC) and methane (CH4)] 3.24 general denominator a counter indicating the number of times a vehicle has been operated, taking into account general conditions in FG.4.4 3.25 group of monitors for the purpose of assessing the in-use performance of an OBD engine family, a set of OBD monitors used for determining the correct operation of the emission control system 3.26 ignition cycle counter a counter indicating the number of engine starts a vehicle has experienced 3.27 in-use performance ratio, IUPR the ratio of the number of times that the conditions have existed under which a monitor, or group of monitors, should have detected a malfunction relative to the number of driving cycles relevant for the operation of that monitor or group of monitors 3.28 low speed (nlo) the lowest engine speed where 55% of the maximum net power occurs 3.29 malfunction a failure or deterioration of an engine system, including the OBD system, that might reasonably be expected to lead either to an increase in any of the regulated pollutants emitted by the engine system or to a reduction in the effectiveness of the OBD system 3.30 malfunction indicator, MI an indicator which is part of the alert system and which clearly informs the driver of the vehicle in the event of a malfunction 3.31 maximum net power the maximum value of the net power measured at full engine load 3.32 net power the power obtained on a test bench at the end of the engine crankshaft or its equivalent according to the requirements of annexes to GB/T 17692 and determined under reference atmospheric conditions 3.33 non-emission-related maintenance the maintenance which does not substantially affect emissions and which does not have a lasting effect on the emissions deterioration of the vehicle or the engine during normal in-use operation once the maintenance is performed 3.34 on-board diagnostic system, OBD computer information system on-board of a vehicle or engine, which belongs to the pollution control device and has the capability of: a) diagnosing malfunctions, affecting the emission performance of the engine; b) indicating their occurrence by means of an alert system; c) identifying the likely area of the malfunction by means of information stored in computer memory and communicating that information off-board 3.35 OBD engine family a manufacturer’s grouping of engine systems having common methods of monitoring and diagnosing emission-related malfunctions 3.36 operating sequence a sequence consisting of an engine start, an operating period (of the engine), an engine shut-off, and the time until the next start, where a specific OBD monitor runs to completion and a malfunction would be detected if present 3.37 original pollution control device a pollution control device or an assembly of such devices covered by the type-test granted for the engine or vehicle concerned, with the content filled in corresponding subclauses in Annex B 3.38 parent engine an engine selected from an engine family in such a way that its emissions characteristics will be representative for that engine family 3.39 parent vehicle a vehicle type, which has passed the type test, selected from an vehicle type family in such as way that its emissions characteristics will be representative for that vehicle type family 3.40 particulate after-treatment device an exhaust after-treatment system designed to reduce emissions of particulate pollutants (PM) through a mechanical, aerodynamic, diffusional or inertial separation 3.41 particulate matter, PM any material collected on filter after diluting exhaust to a temperature between 315K (42℃) and 325K (52℃); this is primarily carbon, condensed hydrocarbons, and sulphates with associated water 3.42 particle number, PN the total number of particles of a diameter greater than 23nm present in the diluted exhaust gas after it has been conditioned to remove volatile material, as described in Appendix CC 3.43 percent load the fraction of the maximum available torque at an engine speed 3.44 performance monitoring malfunction monitoring, that consists of functionality checks and the monitoring of parameters that are not directly correlated to emission thresholds, and that is done on components or systems to verify that they are operating within the proper range (e.g differential pressure monitoring of DPF) 3.45 periodic regeneration the regeneration process of an emission control device that occurs periodically in less than 100h of normal engine operation 3.46 portable emissions measurement system, PEMS a portable emissions measurement system meeting the requirements specified in Annex K of this standard 3.47 power take-off unit an engine driven output device for the purposes of powering auxiliary, vehicle mounted, equipment 3.48 qualified deteriorated component or system, QDC a component or system that has been intentionally deteriorated such as by accelerated ageing or by having been manipulated in a controlled manner and which has been accepted by the competent department of ecology and environment under the State Council according to the provisions set out in Annex F, F.6.4.2 of this standard for use when demonstrating the OBD performance of the engine system 3.49 reagent any medium that is stored on-board the vehicle in a tank and provided to the exhaust after-treatment system (if required) upon request of the emission control system 3.50 recalibration a fine tuning of NG engine in order to provide the same performance (power, fuel consumption) in a different range of natural gas 3.51 reference mass the kerb mass of the vehicle increased by a uniform mass of 100kg 3.52 replacement pollution control device a pollution control device or an assembly of such devices intended to replace an original pollution control device and which can be approved as a separate technical unit for type test 3.53 scan-tool external test equipment used for standardised off-board communication with the OBD system in accordance with the requirements of this standard 3.54 service accumulation schedule the ageing cycle and the service accumulation period for determining the deterioration factors for the engine-after-treatment system family 3.55 tailpipe emissions the emission of gaseous and particulate pollutants 3.56 tampering inactivation, adjustment or modification of the vehicle emissions or propulsion system, including any software or other logical control elements of those systems, which has the effect, whether intended or not, of worsening the emissions performance of the vehicle 3.57 useful life the relevant period of durability mileage and/or time, whichever is earlier, over which compliance with the relevant gaseous pollutant, particulate matter and smoke emission limits has to be assured for vehicles specified in this standard under normal service conditions 3.58 full life the full lifecycle of a vehicle from production, use to scrapping 3.59 vehicle type with regard to emissions a group of vehicles which do not differ in essential engine and vehicle characteristics as set out in Annex A, hereinafter referred to as "vehicle type". 3.60 wall flow Diesel Particulate Filter a Diesel Particulate Filter ("DPF") in which all the exhaust gas is forced to flow through a wall which filters the gas 3.61 wobbe index the ratio of the corresponding calorific value of a gas per unit volume and the square root of its relative density under the same reference conditions 3.62 λ-shift factor, Sλ an expression that describes the required flexibility of the engine management system regarding a change of the excess air ratio λ if the engine is fuelled with a gas composition different from pure methane (see Appendix CA for the calculation of Sλ) 3.63 dual-fuel engine an engine that can burn diesel oil and a gaseous fuel simultaneously 3.64 world harmonised transient cycle, WHTC 1,800 transient test cycles under operating condition transforming second by second given in Annex C of this standard 3.65 world harmonised steady state cycle, WHSC 13 test cycles under steady state condition given in Annex C of this standard 3.66 urban vehicles the buses, mail trucks and sanitation trucks mainly operating in cities 3.67 vehicles of categories M1, M2, M3, N1, N2 and N3 in accordance with those specified in GB/T 15089: Vehicle of category M1 refers to the passenger vehicle accommodating a maximum of 9 seats including the driver's seat; Vehicle of category M2 refers to the passenger vehicle accommodating more than 9 seats including the driver's seat and having a maximum mass not exceeding 5,000kg; Vehicle of category M3 refers to the passenger vehicle accommodating more than 9 seats including the driver's seat and having a maximum mass exceeding 5,000kg, including: ——Class I: vehicle of category M3 carrying more than 22 passengers (excluding the driver), in which passengers are allowed to stand and walk about; ——Class II: vehicle of category M3 carrying more than 22 passengers (excluding the driver), in which passengers are allowed to stand in the passage and/or a standing area not greater than the area of 2 double-seats shall be provided; ——Class III: vehicle of category M3 carrying more than 22 passengers (excluding the driver), in which passengers are not allowed to stand; ——Class A: vehicle of category M3 carrying not more than 22 passengers (excluding the driver), in which passengers are allowed to stand; ——Class B: vehicle of category M3 carrying not more than 22 passengers (excluding the driver), in which passengers are not allowed to stand. Vehicle of category N1 refers to the goods vehicle having a maximum mass not exceeding 3,500kg; Vehicle of category N2 refers to the goods vehicle having a maximum mass exceeding 3,500kg but not exceeding 12,000kg; Vehicle of category N3 having a maximum mass exceeding 12,000kg 3.68 valid data all test data points from the time when the coolant temperature of the engine is above 70℃ or when it varies less than 2℃ within 5min after the beginning of PEMS test (whichever is earlier, but not later than 20min after the engine starts) to the end of the test 4 Pollution control requirements 4.1 Type test 4.1.1 General requirements 4.1.1.1 The engines or vehicles within the application scope of this standard shall be subjected to type test according to the test items specified in 6.2 herein to prove that the engines or vehicles meet the requirements of Clause 6. 4.1.1.2 The engine type or family may be used as a separate technical unit for type test. 4.1.1.3 The vehicle equipped with an engine that has not yet undergone type test shall have its engine being type-tested, and the one with an engine that has undergone type test is not required to have its engine being additionally type-tested. In addition to the engine test, all vehicles undergoing type test shall be subjected to the on-complete vehicle (PEMS) test specified in 6.2.2. 4.1.1.4 Fuel requirements of type test 4.1.1.4.1 When the parent engine is subjected to type test, the reference fuel conforming to Annex D hereof shall be used. 4.1.1.4.2 The natural gas and liquefied petroleum gas fuelled engines (vehicles) shall be subjected to type test according to the fuel types specified in Annex M. 4.1.1.4.3 The type test of natural gas fuelled engines and liquefied petroleum gas fuelled engines shall meet the requirements of Annex M, Tables M.1 and M.2. 4.1.1.4.4 The type test of dual-fuel engines shall meet the requirements of Annex N, Table N.2. 4.1.1.4.5 If the fuel to be used in the design of the engine family is not included in the reference fuel range specified in Annex D, the manufacturer shall: a) clearly state the types of commercial fuels that the engine family can burn. b) prove that the parent engine can meet the requirements of this standard when burning commercial fuel. c) prove that the engine can meet the in-service conformity requirements when burning a mixture of the specified fuel with any component fuel of the relevant commercial fuel. 4.1.2 Family (parent engine) type test 4.1.2.1 In the type test of an engine, a parent engine that can represent the engine type or family shall be selected. If the selected engine cannot fully represent the type or family mentioned in Annex A, an additional representative engine shall be selected for testing. 4.1.2.2 During the type test of a complete vehicle, a vehicle that can represent the vehicle type (family) undergoing type test shall be selected. If the selected vehicle cannot fully represent the vehicle type or family mentioned in 8.4, an additional representative engine shall be selected for testing. 4.1.2.3 The parent engine (or parent vehicle) represents the emission level of all engine types (vehicle types) in the family. The type test of parent engine (or parent vehicle) may be extended to all members of the family, and other members of the family do not need to be tested. 4.1.2.4 The technical service shall seal up the ECU installed on the engine and vehicle during the type test for future reference, which may not be retained after five years of the shutdown of the engine or vehicle. The competent department of ecology and environment under the State Council may perform confirmation check. 4.1.3 Product type change Any modification to the type-tested engine type or vehicle type shall not have adverse impact on pollutant emission and still meet the requirements of this standard. If the change item belongs to the disclosed information, the vehicle manufacturer shall disclose the information of the product change item; if the change item may affect the emission performance, corresponding tests shall be conducted, and the product change content and test results shall be disclosed. 4.2 Environmentally benign production and in-service conformity 4.2.1 Vehicle and engine manufacturers shall ensure the environmentally benign production conformity of mass-produced vehicles and engines according to the provisions of this standard, and provide relevant assurance materials for production conformity according to the requirements of Annex I in this standard. Vehicle manufacturers shall ensure that the emission of newly produced vehicles meets the standards in accordance with the provisions of this standard, and provide data relevant to self-inspection of emission from newly produced vehicles to the competent department of ecology and environment under the State Council in accordance with the provisions of Clause 9 in this standard. The competent department of ecology and environment may conduct surveillance sampling inspections on the emission from newly produced vehicles in accordance with the provisions of Clause 9. 4.2.2 Vehicle and engine manufacturers shall ensure the in-service conformity of vehicles and engines in accordance with the provisions of this standard, and provide plans relevant to self-inspection on in-service conformity according to the requirements of Annex J. Vehicle manufacturers shall ensure that vehicles meet the emission standards in actual normal use in accordance with the provisions of this standard, and provide reports of self-inspection on in-service conformity to the competent department of ecology and environment under the State Council in accordance with the provisions of Clause 10. The competent department of ecology and environment may conduct sampling inspections on in-service conformity in accordance with the provisions of Clause 10 of this standard. 4.3 Information disclosure Information about vehicles within the application scope of this standard shall be disclosed by vehicle manufacturers in accordance with the requirements of Annexes A and B of this standard. Contents involving enterprise secrets may be disclosed after technical processing. 5 Engine (Vehicle) nameplate 5.1 General requirements The engine nameplate can be marked with words and numbers, or a QR code. The content on the nameplate must be concise and clear, with the words, numbers or patterns to be clear, distinct, legible and indelible. The nameplate must be fixed in such a way that it is fast and must not be removed, during the full life of the engine. 5.2 Location of engine nameplate The installation position of the nameplate on an engine shall not hinder the engine from normal operation, and it is generally not necessary to change during the lifetime of the engine. In addition, after all accessories required for the operation of an engine are installed, the nameplate shall be located where it is visible to normal people. The nameplate of an engine shall be close to or incorporated on that of the manufacturer. 5.3 Content on an engine nameplate The nameplate of an engine shall at least be marked with the following contents: a) engine model; b) production date: ________(mm-dd-yyyy) (wherein, “day” is optional; it is allowed to omit the production date if it has already been marked at some other area); c) the words "CHINA VI"; d) the trademark or full name of the manufacturer; e) the critical emission-related components (e.g. EGR, DOC, SCR and DPF). 5.4 Special requirements for nameplates of natural gas and liquefied petroleum gas fuelled engines (vehicles) with a limited fuel range 5.4.1 The natural gas and liquefied petroleum gas fuelled engines with a limited fuel range during type tests, in addition to meeting the requirements of 5.3, shall also have the following information included: a) Limited to use high (low) calorific value natural gases; b) Limited to use natural gases (liquefied petroleum gases) with specification of ____. 5.4.2 Vehicles equipped with natural gas and liquefied petroleum gas fuelled engines with a limited fuel range shall also have a nameplate specified in 5.4.1, which shall be located close to the fuel filling port of a vehicle. 5.5 Vehicle body marking A vehicle covered by this standard shall be marked with the words "CHINA VI" on an obvious position on its body. 6 Technical requirements and tests 6.1 General requirements 6.1.1 The components that affect the pollutant emissions from an engine shall be so designed, constructed and assembled as to enable the engine in normal use to comply with the provisions of this standard and its implementation measures. 6.1.2 Manufacturers shall take technical measures to ensure that the vehicles can effectively control the exhaust emission during their full life under normal service conditions. 6.1.2.1 The measures described in 6.1.2 shall ensure that the safety of hoses, joints and connections used in the emission control system meets the requirements of the original design drawings. 6.1.2.2 When the engines (vehicles) are subjected to emission tests under the test conditions specified in this standard, the results shall conform to the corresponding limits specified in this standard. 6.1.2.3 Any engine systems and components that can affect emissions shall be so designed, constructed and assembled as to enable the engine in normal use to comply with the provisions of this standard. Manufacturers shall ensure compliance with the non-standard cycle emission requirements in 6.4 and Annex E, so that a vehicle can effectively control its pollutant emissions when it operates under possible environmental conditions and possible operating conditions. 6.1.2.4 Vehicles equipped with vanadium-based SCR catalysts shall not leak vanadium-containing compounds into the atmosphere during their full life. Relevant data (such as temperature control strategy and relevant test reports) shall be submitted during the type test to prove that the temperature of SCR inlet is lower than 550℃ under any operating condition during the service of the vehicle. 6.1.2.5 The defeat strategies reducing the effectiveness of the emission control device are prohibited. Any tampering with the pollution control device will result in non-conformity with emission standards. 6.1.2.6 The safety of the electric control system shall meet the requirements of F.4.8. 6.1.3 The manufacturers shall organize the information on the emission control strategy of this type into a documentation package, which shall meet the requirements of A.3.5. 6.1.4 The exhaust pipes of the vehicle shall not face to the right or directly below. Its design shall facilitate emission inspection, with the exhaust pipes to be visible from the outside and encouraged to be higher than the vehicle body. Such cases where the exhaust ports of dangerous goods carrier vehicles and special motor vehicles cannot meet the requirements due to structural limitations of vehicles shall be reported to the competent department of ecology and environment under the State Council. 6.1.5 Vehicle manufacturers shall minimize NOx emissions from the original engine (the front end of after-treatment device) and report the emissions (data) from the original engine and test methods to the competent department of ecology and environment under the State Council. 6.1.6 The manufacturers shall clearly inform the user to add and use the required reactants in time to ensure that the vehicle in actual use can meet the emission requirements of this standard.

Contents of GB 17691-2018

Foreword iii 1 Application scope 2 Normative references 3 Terms and definitions 4 Pollution control requirements 5 Engine (Vehicle) nameplate 6 Technical requirements and tests 7 Installation on the vehicle 8 Engine family and parent engine 9 Requirements and inspection for newly produced vehicles 10 In-service conformity requirements and inspection 11 Standard implementation Annex A (Normative) Type test materials Annex B (Informative) Format of type test reports Annex C (Normative) Standard cycle test procedure for engine Annex D (Normative) Specifications of reference fuels Annex E (Normative) Requirements to Off-Cycle Emissions (OCE) tests Annex F (Normative) On-board diagnostic systems (OBD) Annex G (Normative) Requirements to ensure the correct operation of NOx control measures Annex H (Normative) Durability of engine system Annex I (Normative) Assurance requirements and checking of conformity of production Annex J (Normative) Technical requirements for in-service conformity Annex K (Normative) Actual road driving measurement method (PEMS) Annex L (Normative) Measurement method of pollutant emissions by chassis dynamometer on complete vehicle Annex M (Normative) Specific requirements for type test of liquefied petroleum gas or natural gas fuelled engines and vehicles Annex N (Normative) Technical requirements for diesel-gas dual-fuel engines and vehicles Annex O (Normative) Type test of replacement exhaust after-treatment devices as separate technical units Annex P (Normative) Access to vehicle OBD and vehicle maintenance information Annex Q (Normative) Technical requirements and communication data formats of on-board remote emission management terminal