GB/T 14762-1993Limits and measurement method for exhaust pollutants from gasoline engines of heavy-duty vehicles (��, ��) (English PDF)

3.1 Gaseous pollutants

Carbon monoxide (CO), hydrocarbons (HC) (hydrocarbons than gasoline assumed to C1H1.85) and nitrogen oxides (NOx, NO2 when using the Scale Shown).

3.2 Test cycle

Engine in transient conditions the test in accordance with the rotational speed and torque testing procedures.

3.3 Engine (or engine family) type-approval

Exhaust emissions on the level of approval of an engine (or engine family) type.

3.4 Gasoline

Gasoline-fueled spark ignition engines.

3.5 Engine Model (model)

The basic characteristics of the engine listed in Appendix A of the same type of engine no difference.

3.6 Engine family

Manufacturing Enterprises by the provisions of Appendix AB designed a set of engines, these engines have similar exhaust emission characteristics; the same family all engines shall meet the appropriate emission limits.

GB 14762 2008

3.7 Source machine

Selected from the engine family, the engine family to represent the emission characteristics of the engine.

3.8 The net power

In the test bench, the power measurement method according to GB/T 17692-1999 provisions, in the end of the engine crankshaft or equivalent member the measured power.

3.9 Maximum net power (Pmax) manufacturing enterprises in the application for type-approval declared maximum net power.

3.10 Percent load

The percentage of the engine at a speed up to the maximum torque.

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;

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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/m3 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

C3H8 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)

4.2 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. 2.2 should also provide a description of the vehicle and engine-related auto parts, the content included in Appendix A should be the standard Provisions.

4.2. 2.3 shall be accompanied by a model of the engine (or engine family) type approval certificate.

Requirements 4.3 pairs of on-board diagnostic (OBD) system If the application involves the OBD system shall comply with the regulations Section G.3 Appendix G, and attach the following.

Additional Information 4.3. 1 AA.2.3 requirements.

4.3. 2 detailed written information, a comprehensive account of the work of the functional characteristics of the OBD system, including all the vehicle emission control system Off the parts list that OBD system monitoring sensors, actuators and components.

4.3. 3 OBD system malfunction indicator (MI) is described.

4.3. 4 manufacturer shall state in order to prevent damage and changes to the provisions of emissions control ECU.

4.3. 5 applies, a copy of other type-approval, and comes with the type-approval extension relevant information.

4.3. 6 applies, the OBD system accessory GB system family details.

4.3. 7 to be tested according to Section G.3 chapter, shall be responsible for the type approval test inspection agencies to submit a tape OBD system Engine or a car, the engine or car type approval on behalf of the preparation of engine models with OBD systems or engine system Family, car or car-based family. If the agency determines that the engine or car inspection submitted is not entirely representative of the OBD system accessory GB Family-based system, it should submit an alternative or an alternative engine car. If necessary, the need to increase an engine or a car, in the first test described in chapter G.3.

5.1 Petrol engine (cars) type approval

For gasoline engines (cars), the source machine Appendix C of the reference fuel tested in accordance with this standard, the gaseous emissions and OBD system shall meet the requirements of this standard.

Emissions 5.2-based member of the family approved 5.2. 1 Except in the case referred to in Article 5.2.3, the source machine type approval can be extended to all members of the family system without further trial Experience.

5.2. 2 and the on-board diagnostic (OBD) system-related extensions.

5.2. 2.1 in OBD systems for type approval has been given engine model or models can be extended to different engine models or models, as long as the engine model or models belonging to the same engine accessory GB or car OBD system family. But the engine emissions GB 14762 2008 Control system should have been approved by the type approval of the engine type or the same models, and in accordance with Annex GB described OBD...