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GB/T 17692-2024: Measurement methods of net power for automotive engines and drive motor
GB/T 17692-2024
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.060.01
CCS T 11
Replacing GB/T 17692-1999
Measurement methods of net power for automotive engines
and drive motor
ISSUED ON. JUNE 29, 2024
IMPLEMENTED ON. JANUARY 01, 2025
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 General principles... 7
5 Requirements... 7
6 Result evaluation... 8
Appendix A (Normative) Main characteristics of the engine and information related to
the test... 10
Appendix B (Normative) Main characteristics of the drive motor and information
related to the test... 17
Appendix C (Normative) Test method for net power of engine... 19
Appendix D (Normative) Test method for net power and maximum 30 min power of
drive motor system... 31
Appendix E (Normative) Technical requirements for benchmark fuels... 35
Bibliography... 40
Measurement methods of net power for automotive engines
and drive motor
1 Scope
This document describes the method for conducting net power test and maximum 30
min power test of drive motor systems for engines and drive motor systems for M and
N category vehicles, based on the net power versus speed curve proposed by the
manufacturer.
This document applies to reciprocating piston engines (spark ignition or compression
ignition) or rotary engines (spark ignition or compression ignition), but not to free
piston engines.
This document applies to drive motor systems.
2 Normative references
The following documents are referred to in the text in such a way that some or all of
their content constitutes requirements of this document. For dated references, only the
version corresponding to that date is applicable to this document; for undated references,
the latest version (including all amendments) is applicable to this document.
GB 17691-2018, Limits and measurement methods for emissions from diesel
fueled heavy-duty vehicles (CHINA VI)
GB 18352.6-2016, Limits and measurement methods for emissions from light-duty
vehicles (CHINA 6)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB 17691-2018
and GB 18352.6-2016 as well as the following apply.
3.1
net power
The power measured at the corresponding speed at the engine crankshaft end (or the
shaft end of the drive motor system) or its equivalent end on the test bench according
to the prescribed test method. The engine product needs to be corrected according to
standard atmospheric conditions.
4 General principles
4.1 Product certification
4.1.1 Engines or drive motor systems submitted for certification in accordance with the
requirements of Chapter 5 (the main characteristics and test-related information shall
be in accordance with the provisions of Appendix A or Appendix B) shall undergo
product certification tests in accordance with the provisions of Appendix C or Appendix
D.
4.1.2 The product certification test results shall comply with the provisions of 6.1.
4.2 Production consistency
4.2.1 In order to verify that the engine or drive motor system produced after product
certification meets the quality requirements, a sample shall be selected for testing in
accordance with the provisions of Appendix C or Appendix D, and the test results shall
comply with the provisions of 6.2.
4.2.2 If the above sample cannot meet the requirements of 6.2, two more samples shall
be selected for testing in accordance with the requirements of Appendix C or Appendix
D. The test results shall meet the requirements of 6.2.
5 Requirements
5.1 Basic requirements
5.1.1 Parts that affect the power of the engine or drive motor system shall meet the
technical standards of the manufacturer during the design, manufacturing and assembly
process to ensure that the engine or drive motor system can operate normally and stably.
5.1.2 For hybrid electric vehicles, the engine and drive motor system shall be tested
separately.
5.1.3 For dual-fuel engines with diesel mode, the test shall consist of the dual-fuel mode
and diesel mode on the same engine.
5.2 Test requirements for net power for engine
5.2.1 Carry out the net power test of the engine in accordance with the requirements of
Appendix C. The accessories installed during the test shall meet the requirements of
Table C.1.
5.2.2 Except for the following cases, the fuel used in the engine test shall be
commercially available fuel. In case of dispute, the benchmark fuels in Appendix E
shall be used.
a) For engines not equipped with adaptive fuel supply, when the fuel is liquefied
petroleum gas, the benchmark fuel A specified in Table E.3 shall be used; when
the fuel is natural gas, commercially available fuel can be used, while its Wobbe
index shall be at least 52.6 MJ/m3 (4 ℃, 101.3 kPa). In case of dispute, the
benchmark fuel G20 specified in Appendix E shall be used.
b) For natural gas engines marked with a specific fuel calorific value range, if it is
marked as a high calorific value fuel (H range), commercially available fuel may
be used, but its Wobbe index must be at least 52.6 MJ/m3 (4℃, 101.3 kPa). In
case of dispute, standard fuel G20 specified in Appendix E shall be used. If it is
marked as a low calorific value fuel (L range), commercially available fuel may
be used, but its Wobbe index must be at least 47.2 MJ/m3 (4 ℃, 101.3 kPa). In
case of dispute, the benchmark fuel G23 specified in Appendix E shall be used.
c) For engines marked with specific fuel components, the fuel indicated shall be
used and this shall be stated in the test report.
5.3 Test requirements for net power and maximum 30 min power for drive motor
system
5.3.1 Carry out the net power and maximum 30 min power test of the drive motor
system according to the requirements of Appendix D; the accessories installed during
the test shall meet the requirements of Table D.1.
5.3.2 Control the drive motor system to perform the maximum 30 min power test at
rated speed.
Note. The rated speed of the drive motor system refers to the maximum speed
corresponding to the maximum mechanical torque that the drive motor system
can output for a long time.
6 Result evaluation
6.1 Product certification test results
6.1.1 The engine product is based on the manufacturer's declared curve. If the net power
value on the declared curve corresponds to a single speed, the test is conducted within
the deviation of the speed corresponding to each declared value within ±1.5%; if the
declared value corresponds to the speed range (X1 ~ X2), the test is conducted within
the speed range corresponding to each declared value from (X1 + 1.5% X1) r/min to
(X2-1.5% X2) r/min (X1< X2). The deviation between the net power value measured in
the test and the corresponding declared value shall meet the following requirements.
the maximum net power measured point on the declared curve shall not exceed ±2%,
and the other measured points shall not exceed ±4% and shall not exceed 2% of the
declared maximum net power value.
C.4.6 Torque, fuel consumption and intake air temperature shall be measured
simultaneously as far as possible. The measurement time shall be no less than 10