GB 19756-2005Limits and measurement methods for exhaust pollutants from diesel engines of tr-wheel low-speed goods vehicles (English PDF)

3.1 Tri-wheel & low-speed goods vehicles

According to the provisions of GB 7258-2004.

Tri-wheel vehicles refer to freight vehicles, which have three wheels whose maximum

design speed is less than or equal to 50 km/h.

Low-speed goods vehicles refer to freight vehicles, which have four wheels whose

maximum design speed is less than 70 km/h.

3.2 Type approval of vehicle

It refers to the approval of a vehicle type for the emission level of exhaust pollutants.

3.5 Diesel engine family

Refers to a group of diesel engines, which are designed by the manufacturer in

accordance with the provisions of Annex AB. These diesel engines have similar exhaust

emission characteristics; all diesel engines in the same family must meet the

corresponding emission limits.

3.6 Source engine

It refers to a diesel engine, which is selected from a diesel engine family, that can

represent the emission characteristics of the diesel engine family.

4.1 Application for type approval

Manufacturers of tri-wheel & low-speed goods vehicles OR diesel engines for tri-wheel

& low-speed goods vehicles shall make application for the type approval, from the

emission type approval department, which is responsible for the emission of vehicle,

(hereinafter referred to as the "type approval authority"), on the exhaust pollutant

emission levels of the tri-wheel & low-speed goods vehicles and the diesel engines, that

meet the applicable scope of this standard.

4.1.1 Application for type approval of diesel engines for tri-wheel & low-speed goods

vehicles

4.1.2 Application for type approval of tri-wheel & low-speed goods vehicles

4.1.2.1 Application for type approval of models equipped with non-type approved

diesel engines

4.1.2.2.1 Manufacturers of tri-wheel & low-speed goods vehicles shall apply for type

approval of the tri-wheel & low-speed goods vehicles, which are equipped with diesel

engines, that have been type-approved in terms of their exhaust pollutant emission

levels.

4.2 Approval of type approval

Diesel engines, that meet the requirements of Article 4.2.1 and Article 4.2.2 of this

standard, OR tri-wheel & low-speed goods vehicles, that meet Article 4.2.3 and Article

4.2.4 of this standard, shall be granted type approval and issued with the type approval

certificate, in accordance with Appendix C.

4.2.1 The diesel engine (source engine) shall be tested according to the provisions of

Appendix B of this standard. The exhaust pollutant emission shall meet the

requirements in Table 1 of Article 6.1 of this standard.

4.2.2 Discharge approval for family members

4.2.2.1 Except for the cases mentioned in Article 4.2.2.2, the type approval of the source

engine can be extended to all members of the family, without further testing.

4.2.3 The type-approved models of tri-wheel & low-speed goods vehicles shall comply

with the restrictions and installation conditions of the diesel engine type approval (see

Article 7 of this standard), after installing the vehicle parts related to the diesel engine

(see Appendix AC for the details).

4.2.4 The free acceleration smoke of tri-wheel & low-speed goods vehicles, with type

approval, shall meet the requirements of GB 18322.

5.1 Test classification

The test is divided into type approval test and production consistency inspection test.

5.1.1 Type approval test

The manufacturer shall submit a diesel engine, that matches the characteristics of the

"diesel engine type" or "source engine", which is described in Appendix A, for the test

specified in Article 5.2 of this standard.

5.1.2 Production consistency check test

Randomly select one diesel engine from mass-produced qualified diesel engines, that

have been type-approved, to carry out the test specified in Article 5.2 of this standard.

The engine used for the test shall be run-in or partially run-in, according to the

manufacturer's technical specifications.

5.2 Test method

The test method shall be carried out in accordance with the provisions in Appendix B.

Annex BD describes the recommended gaseous pollutant analysis system and

particulate matter sampling and analysis system.

6.1 Type approval test

6.1.1 See Table 1, for the emission limits of exhaust pollutants in the type approval test.

6.1.2 Judgment of type approval test results

If the specific emissions of carbon monoxide, hydrocarbons, nitrogen oxides,

particulate matter, which is measured in one test of the diesel engine, are less than or

equal to the limit values specified in Table 1, the type approval test is qualified.

6.2 Production consistency inspection test

6.2.1 See Table 2, for the emission limits of exhaust pollutants, in the production

consistency inspection test.

6.2.2 Judgment of production consistency inspection test results

6.2.2.1 If the specific emissions of carbon monoxide, hydrocarbons, nitrogen oxides,

particulate matter, which are measured by a diesel engine, as selected from mass-

produced qualified products, are all less than or equal to the limit values specified in

Table 2, THEN, the production consistency of batches of products is qualified.

6.2.3 If the sampled diesel engine does not meet the requirements of Article 6.2.2.1 and

fails to pass the test specified in Article 6.2.2.2, the manufacturer of tri-wheel & low-

speed goods vehicles (or diesel engines) shall take all necessary measures, as soon as

possible to re-establish the production consistency. Otherwise, the type approval of the

vehicle model (model) shall be revoked.

7.1 The air intake resistance must not exceed the value, which is specified in Annex

AA.1.18 for the diesel engine, that has passed the type approval test.

7.3 The maximum power, which is absorbed by the accessories driven by the diesel

engine, shall not exceed the allowable maximum power, which is absorbed by the diesel

engine, that has passed the type approval test in Annex AA.

8.1 Determination of parameters of diesel engine family

Diesel engines of the same family must share the following basic parameters.

8.1.1 Combustion cycle. Two-stroke/four-stroke

8.1.2 Cooling medium. Air/water/oil

8.1.3 Single cylinder displacement.

- The difference between the diesel engines in a family is not more than 15%

8.1.4 Intake mode. Natural air intaking/supercharging/supercharged intercooling

8.1.5 Combustion chamber form/structure. Pre-combustion combustion

chamber/vortex combustion chamber/separated combustion chamber

8.1.8 Other characteristics.

8.2 Selection of source engine

8.2.1 The selection of the source engine of the diesel engine family shall be based on

the principle of the highest fuel supply per stroke, at the maximum rated torque speed.

8.2.2 If the diesel engine in the family has other variable characteristics, that can affect

the exhaust pollutants, THEN, these characteristics shall also be taken into account,

when selecting the source engine.