GB 20891-2014[Including 2020XG1] Limits and measurement methods for exhaust pollutants from diesel engines of non-road mobile machinery (CHINA III, IV) (English PDF)

3.1 Non-road mobile machinery

Various machinery used for non-road and mentioned in "scope", i.e..

3.2 Secondary engine

Diesel engine which is mounted for road vehicle, does not provide driving force for vehicle but provides power for vehicle-mounted special facilities.

3.3 Test cycle

The procedures that diesel engine is tested at stated speed and torque under steady-state condition or instantaneous condition (NRTC test).

3.4 Non-road transient cycle

Test cycle including 1238 conditions changing second by second as specified in Attachment BE of this Standard.

3.5 Reference speed

Actual speed value corresponding to 100% point relative speed in NRTC test as described in

Attachment BB of Standard GB 17691-2005.

3.6 Diesel engine type-approval

Approve a diesel engine type with respect to emission level of exhaust pollutants from diesel engine.

4.1 Application of type approval

The application of type approval for diesel engines of non-road mobile machinery is proposed by manufacturing enterprise or its authorized agent to the type approval institution, and the inspection content required by this Standard shall be completed.

4.1.1 The technical data related to type approval and the relevant durability test method and test result data shall be submitted according to the requirements of Appendix A and Attachment

BD of this Standard.

4.2 Authorization of type approval

4.2.1 The type approval institution authorizes the type approval for diesel engine type (or family) meeting the requirements of Article 5 and Appendix G of this Standard, and issues type approval certificate specified in Appendix F.

4.3 Exemption of type approval

For diesel engines used for special purposes such as export, exhibition, rescue, emergency, matching test and replacement, application for type approval exemption can be filed to type approval competent authority. Documents need to be submitted to competent authorities include.

model, power, manufacturing plant, purpose, emission standard phase, quantity, production date, etc.

5.1 General

The technical measures taken by the manufacturing enterprises must ensure the emission of diesel engine under normal operating conditions and within the useful life period specified in

Article 5.2.2 of this Standard meets the requirements of this Standard.

5.2 Provisions for exhaust pollutants

5.2.1 Test regulations and sampling system

The measurement and sampling regulations for exhaust pollutants from diesel engine shall be in accordance with those specified in Attachment BA of Appendix B, and the test cycle shall be in accordance with stable-state test cycle specified in Table B.1 or Table B.2 or Table B.3 of

Appendix B. In Phase IV, non-constant speed diesel engine not exceeding 560 kW also need to be tested in accordance with NRTC transient test cycle specified in Attachment BE. The exhaust pollutants from diesel engine shall be determined by the system described in Appendix C.

5.2.2 Useful life

Exhaust and control device of diesel engine shall be ensured to work well, and the pollutant emission shall comply with the limit value requirements specified in 5.2.3.

For the diesel engine durability running test, the durability test specified in Table 1 shall be completed in accordance with the requirements of Attachment BD; the shortest operation duration or equivalent operation duration of diesel engine exhaust durability shall not be less than

25% of the useful life specified in Table 2;

5.2.3 Limits

The brake specific emission of carbon monoxide (CO), hydrocarbon (HC), oxynitride (NOx) and particulate matter (PM) in exhaust pollutants from diesel engines of non-road mobile machinery, multiplied by the deterioration coefficient determined according to Article BD.2.9 in Attachment BD of this Standard (for diesel engines installed with exhaust aftertreatment system), or plus the deterioration correction value determined according to Article BD.2.10 in

Attachment BD of this Standard (for diesel engines not installed with exhaust aftertreatment system) shall not exceed the limit specified in Table 2.

5.2.5 The diesel engine for replacement shall meet the emission requirements of the original diesel engine when it was manufactured.

5.3 Requirements for installing diesel engine on non-road mobile machinery

The diesel engine installed on non-road mobile machinery shall meet the following characteristics of this diesel engine type-approval.

5.3.1 The intake pressure drop shall not exceed the pressure drop of the engine subjected to type approval specified in Attachment AA.1.18.

5.3.2 The exhaust back pressure shall not exceed the back pressure of the engine subjected to type approval specified in Attachment AA.1.19.

6.1 General requirements

6.1.1 For diesel engine type (or family) of non-road mobile machinery subjected to type approval and produced in batch, the manufacturing enterprise must take measures to ensure diesel engine type (or family) is in conformity with emission declaration materials of this diesel engine type (or family).

6.1.2 The type approval institution shall conduct production conformity inspection based on the content of emission declaration materials of this diesel engine type (or family) of non-road mobile machinery.

6.2 Production conformity inspection of diesel engine emission

6.2.1 One prototype shall be randomly taken from the diesel engines produced in batch. The manufacturing enterprise shall not make any adjustment for the diesel engines sampled for inspection, but may conduct grinding-in according to the manufacturing enterprise's technical specification.

6.2.2 If the brake specific emission of gaseous pollutants and particulate matters of the taken diesel engines, after being corrected according to the deterioration coefficient or deterioration correction value determined in type approval does not exceed the limit requirements specified in

Article 5 of this Standard, then the production conformity of this batch of products is qualified.

6.2.3 If one diesel engine randomly taken from the products in batch fails to meet the limit requirements specified in Article 5 of this Standard, the manufacturer may require taking several diesel engines from the products in batch for production conformity check.The manufacturing enterprise shall determine the quantity n of the sample engines (including the original sample engine).Except for the original sample engine, other diesel engines also need to be tested.

6.2.4 Although there are requirements in 6.2.1 to 6.2.3, The type approval institution can select methods and judgment criteria as follows.

6.3 Production conformity inspection of catalytic converter

6.3.1 Randomly take three sets of catalytic converters from the assembly line or products in batch for carrying out measurement for their carrier volume and the content of each precious metal according to the requirements of HJ 509-2009.

6.3.2 Determination criteria for the production conformity of catalytic converter.

8.3 Single cylinder displacement

8.4 Intake mode

8.5 Combustion chamber type/structure

8.6 Air valve and port- structure, dimension and quantity

8.7 Fuel injection system

8.8 Other characteristics

8.9 Exhaust aftertreatment