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GB 20891-2014: Limits and measurement methods for exhaust pollutants from diesel engines of non-road mobile machinery (CHINA III, IV)
GB 20891-2014
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 13.040.50
Z 64
Replacing GB 20891-2007
Limits and Measurement Methods for Exhaust Pollutants
from Diesel Engines of Non-road Mobile Machinery
(CHINA III, IV)
[Including Amendment 2020XG1]
ISSUED ON: MAY 16, 2014
IMPLEMENTED ON: OCTOBER 1, 2014
Issued by: Ministry of Environmental Protection (MEP);
General Administration of Quality Supervision, Inspection and
Quarantine (AQSIQ) of the People's Republic of China.
Table of Contents
Foreword ... 4 
1 Scope ... 6 
2 Normative References ... 7 
3 Terms and Definitions ... 7 
4 Application and Authorization of Type Approval ... 13 
5 Technical Requirements and Test ... 14 
6 Production Conformity Inspection ... 17 
7 Diesel Engine Label ... 19 
8 Parameters for Determining Diesel Engine Family ... 20 
9 Selection of Parent Engine ... 22 
10 Standard Implementation ... 22 
Appendix A (Normative) Type Approval Declaration Materials ... 24 
Attachment AA (Normative) Basic Characteristics and Relevant Test Data of Diesel
Engine (Parent Engine)1) ... 26 
Attachment AB (Normative) Basic Characteristics of Diesel Engine Family ... 34 
Attachment AC (Normative) Basic Characteristics of Diesel Engine Type in Family1)
36 
Appendix B (Normative) Test Regulations ... 42 
Attachment BA (Normative) Measurement and Sampling Specification ... 50 
Attachment BB (Normative) Calibration Specification ... 57 
Attachment BC (Normative) Data Determination and Calculation ... 67 
Attachment BD (Normative) Technical requirements for durability ... 76 
Attachment BE (Normative) Set specification for setting of engine dynamometer in
NRTC test cycle ... 79 
Appendix C (Normative) Sample system for Gas and Particulate Matter ... 88 
Appendix D (Normative) Technical Requirements of Reference Diesel1) ... 116 
Appendix E (Normative) Devices and Accessories Installed for Diesel Engine Power
Test ... 119 
Appendix F (Normative) Type Approval Certificate ... 122 
Attachment FA (Normative) Test Results ... 124 
Appendix G (Normative) Production Conformity ... 127 
Appendix H (Informative) Bibliography ... 129 
AMD 1-2020 [2020XG1] ... 131 
Limits and Measurement Methods for Exhaust Pollutants
from Diesel Engines of Non-road Mobile Machinery
(CHINA III, IV)
1 Scope
The standard specifies the limits and measurement methods for the exhaust pollutant from
diesel engines of non-road mobile machinery (including marine diesel engines with a rated net
power not exceeding 37kW) and the secondary diesel engines installed on road vehicles for
carrying people (cargo).
This Standard is applicable to type approval and production conformity inspection of the diesel
engines installed for the following (including but not limited to) non-road mobile machinery,
with rated net power not exceeding 560kW and operating at non-permanent speed, e.g.:
-- Industrial drilling equipment;
-- Engineering machinery (including loader, bulldozer, road roller, asphalt paver, truck for
non-highway, excavator, etc.);
-- Agricultural machinery (including large tractor, combine-harvester, etc.);
-- Forestry machinery;
-- Material handling machinery;
-- Snow-plough equipment;
-- Airport ground servicing equipment.
This Standard is applicable to type approval and production conformity inspection of the diesel
engines installed for the following (including but not limited to) non-road mobile machinery,
with rated net power not exceeding 560kW and operating at non-permanent speed, e.g.:
-- Air compressor;
-- Generator unit;
-- Fishery machinery (automatic aerator, pond excavator, etc.);
-- Water pump.
stand and under the test condition specified in this Standard.
Note: In net power test, the devices and accessories installed in diesel engine are detailed in Appendix E and the used equivalent
fuel technical parameters are detailed in Appendix D.
3.14 Rated net power
Net power indicated by the manufacturing enterprise for diesel engine type-approval.
3.15 Rated speed
Full-load maximum speed specified in the manufacturing enterprise's operating instructions and
allowed by speed governor; if the diesel engine is not equipped with speed governor, it refers
to the speed at the maximum power of diesel engine specified in the manufacturing enterprise's
operating instructions.
3.16 Percent load
Percentage of maximum torque obtained at a certain speed of diesel engine.
3.17 Intermediate speed
Speed of diesel engine designed to operate at non-permanent speed and meeting one of the
following conditions when operating according to full load torque curve:
-- If the nominal maximum torque speed is 60%~75% of the rated speed, the intermediate
speed shall take the nominal maximum torque speed;
-- If the nominal maximum torque speed is less than 60% of the rated speed, the intermediate
speed shall take 60% of the rated speed;
-- If the nominal maximum torque speed is greater than 75% of the rated speed, the
intermediate speed shall take 75% of the rated speed.
3.18 Useful life
Service time which is specified in Article 5.2.2 of this Standard, ensures normal operation of
diesel engines of non-road mobile machinery and their emission control systems (if any) and
meets the relevant gaseous pollutants and particulate matter emission limits, and has been
confirmed in type approval.
3.19 Replacement diesel engine
New diesel engine of non-road mobile machinery only used for components renewal.
3.20 Abbreviations, symbols and units
3.20.1 Test parameter symbols
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.
4.2.2 When the diesel engine is capable of completing its function only operating in
combination with other parts of non-road mobile machinery or provides an operating
characteristic, the type approval must verify whether one or more requirements when the diesel
engine operates in combination with other parts of non-road mobile machinery (no matter real
or analogic) are met. The range of diesel engine type-approval shall be restricted according to
these conditions; the type approval certificate of diesel engine type or family shall cover service
restriction conditions and installation instructions.
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 Technical Requirements and Test
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.
The durability test shall be completed through mature-technology engineering method in
accordance with the technical requirements in Attachment BD of this Standard. In the durability
test process, the parts such as diesel oil filter element and engine oil filter element or system
may be periodically replaced, and such work mu...