GB 14762-2008Limits and measurement methods for exhaust pollutants from gasoline engines of heavy-duty vehicles (China III, IV) (English PDF)

3.11 Heavy Gasoline Engine Transient Cycle Performed in this standard

7.2 contains one 830-by-second conversion conditions of the test cycle. The test cycle is launched using Annex BB Machine normalized speed and torque time time data conversion in accordance with the method prescribed in Annex BA from the actual test engine rotational speed And torque between the time series.

3.12 engine operating speed range The standard set forth in Appendix B, the most common practice when the engine speed range of the engine, which is below the maximum net power speed And between the idle speed.

3.13 maximum net power speed (nPmax) maximum net power engine speed issue when.

3.14 Failure means An apparatus, by measuring it, in response to induction or car operating parameters (such as vehicle speed, engine speed, transmission gear, temperature, Intake pressure or other parameters) to activate, adjust, delay or stop work or a part of the function of the emission control system so that steam Car under normal conditions of use, the effectiveness of the emission control system is reduced, and the apparatus of the above functions without the use of type approval. When no other measures do not reduce the efficiency of the emission control system may be, the following devices are not as disabling means.

--- In order to avoid interruption of work due to engine damage or failure, the engine used temporary protection;

--- Only at engine start-up or during warm-functioning devices.

3.15 auxiliary control unit (AECS) A system installed on the engine or car, function or control strategy to protect the engine and its ancillary equipment, in order to avoid Free engine damage and failure, or in favor of starting the engine. An auxiliary control device may also be a countermeasure or measures, It should prove that it is not a failure of the device.

3.16 irrational emission control strategy Some countermeasures or measures to enable the vehicle under normal operating conditions reduce the effectiveness of emission control systems, lower than the corresponding type approval Level. 3.17-board diagnostic (OBD) system Emission control OBD system. It should identify the possible fault zone function, fault code and the way the letter Information stored in the electronic control unit memory.

3.18 OBD engine family When a common standard in accordance with this Appendix G of the type approval requirements of OBD systems, manufacturing enterprises by Chapter 9 of Annex OBD system design parameters produced a set of engine systems.

3.19 In the car/engine compliance check Testing and conformity assessment in accordance with section 7 of this Standard and Appendix H conducted.

3.20 M1, M2, M3, N2, N3 type of vehicle according to GB/T 15089-2001 provisions. M1 vehicles meant to include the driver's seat, including the seat number of not more than nine passenger vehicle; GB 14762 2008 M2 class car meant to include the driver's seat, including the seat number more than 9, and the maximum design total mass not exceeding 5 000 kg of passenger vehicles; M3 category vehicles meant to include the driver's seat, including the seat number more than 9, and the maximum designed total mass exceeding 5 000 kg of passenger vehicles; N2 category vehicles means the maximum designed total mass exceeding 3 500 kg, but not exceeding 12 000 kg of cargo vehicles; N3 class vehicles means the maximum designed total mass exceeding 12 000 kg of cargo vehicles.

3.21 Heavy-Duty Truck Maximum total mass greater than 3 500 kg of category M and N vehicles. The definition of class M and N categories of vehicles according to GB/T 15089-2001 regulation set.

3.22 Symbols and units

3.22.1 Test Parameters Symbol Symbol Unit Definition C1 - C 1 (C1) equivalents of hydrocarbons conc 10 - 6,% volume fraction represented by the subscript D0 m3/s PDP calibration intercept function curve DF - dilution factor f a - Laboratory atmospheric factor FS - stoichiometric coefficients GTOTW kg/h diluted exhaust gas mass flow rate (wet basis) H J/kg calorific value HREF g/kg of the reference value of the absolute humidity (10.71g/kg) Ha g/kg Absolute humidity of the intake air Hd g/kg Absolute humidity of the dilution air HTCRAT mol/mol hydrogen - carbon ratio Kw, a - intake from the dry to wet correction factor group Kw, d - dilution air from dry to wet basis correction coefficient Kw, e - diluted exhaust gas from the dry to wet correction factor group L% test engine torque with respect to the percentage of the maximum torque m - PDP calibration function curve slope CVS entire cycle MTOTW kg Total diluted exhaust mass (wet basis) MTOTW, kg CVS instantaneous mass of the diluted exhaust (wet basis) Np - total number of revolutions of the entire cycle PDP Np, i - a certain time interval the total number of revolutions PDP n r/min Engine speed nP s - 1 PDP speed nPmax r/min Engine maximum net power speed P a kPa Saturation vapor pressure of engine intake air pA kPa absolute pressure pB kPa Total atmospheric pressure P d kPa Saturation vapor pressure of the dilution air p s kPa Dry air intake pressure P l kPa pressure drop at the pump inlet Power P (a) when the accessory is installed kW of absorbed test GB 14762 2008 CONTINUED Symbol Unit Definition Power P (b) kW will be removed during the test accessories absorbed P (n) kW Net power uncorrected P (m) kW Power measured test stand Q s m3/s CVS volume flow R a% Relative humidity of the intake air Rd% Relative humidity of the dilution air R f - FID response factor rho kg/m

3 Density T K thermodynamic temperature Ta K intake air temperature V0 m3/r PDP effective volume flow rate The actual cycle work W act kW · h heavy gasoline Transient Cycle Reference cycle work W ref kW · h heavy gasoline Transient Cycle X0 m3/r PDP volume flow calibration function

3.22.2 chemical component symbol C2H6 ethane C3H

8 Propane CO carbon monoxide CO2 carbon dioxide HC Hydrocarbons NOx nitrogen oxides NO NO Nitrogen dioxide NO2

3.22.3 Acronym CFV critical flow venturi tube (Critical flow venturi) CLD chemiluminescence detector (Chemiluminesecnt detector) FID flame ionization detector (Flame ionzation detector) HCLD Heated chemiluminescent detector (Heated chemiluminesecnt detector) HFID Heated flame ionization detector (Heated Flame ionzation detector) NDIR non-dispersive Infrared Analyzer (Non-dispersive infrared analyser)

4 type approval application

This standard applies to the scope of a new car by car or engine or engine manufacturers or their authorized agents according to the requirements of this standard Environmental protection under the State Council administrative department to apply for type approval and complete the contents of this test required by the standard.

4.1 As an independent technology assembly engine model (or family) of the type approval application 4.1. 1 as a separate technical assembly of the engine type or family, the gasoline engine emission levels of gaseous pollutants and OBD system Type approval application, shall be the engine manufacturer or its authorized agent asked. 4.1. 2 should also provide a description of the engine type or engine family, which includes the contents of the provisions of Appendix A should be the standard. GB 14762 2008 Type approval test inspection agency 4.1. 3 shall be responsible for carrying out the provisions of Chapter 7, according to Annex A to submit a description of the "engine Type "or" parent engine "characteristics of the engine, the completion of the inspection the contents of this standard.

4.2 pairs of vehicles type-approval application 4.2. One pair mounted engine models without type approval application for type approval Car type 4.2.

1.1 on the installation without type approval or gasoline-based family of gaseous pollutant emission levels and OBD systems conducted Style application for approval, by automobile manufacturers or their authorized agents proposed. 4.2.

1.2 should also offer models with engine related automotive components, and engine type or engine family (if applicable) Description of the content included in the provisions of Appendix A should be the standard. Type approval test inspection agency 4.2.

1.3 shall be responsible for carrying out the provisions of Chapter 7, submit a description of compliance with Appendix A "launch Machine type "or" parent engine "characteristics of the engine, the completion of the inspection the contents of this standard.

4.2 is equipped with two pairs of the type approved engine models for type approval application 4.2.

2.1 for the car, its type approved types of gasoline or a family-based emission levels of gaseous pollutants and OBD system Application for approval, by automobile manufacturers or their authorized agents proposed. 4.2.