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GB/T 32692-2016 English PDF (GBT32692-2016)

GB/T 32692-2016 English PDF (GBT32692-2016)

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GB/T 32692-2016: Performance test methods for endurance braking systems of commercial vehicles

This standard specifies the performance test method for the endurance braking system of commercial vehicles. This standard applies to commercial vehicles equipped with endurance braking systems.
GB/T 32692-2016
GB
NATIONAL STANDARD
OF THE PEOPLE REPUBLIC OF CHINA
ICS 43.040.40
T 24
Performance test method for endurance
braking systems of commercial vehicles
(ISO 12161.2006, Road vehicles - Endurance braking systems
of motor vehicles and towed vehicles - Test procedures, NEQ)
ISSUED ON. JUNE 14, 2016
IMPLEMENTED ON. JANUARY 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China;
Standardization Administration of the People's Republic of
China.
Table of contents
Foreword ... 4
Introduction ... 5
1 Scope ... 6
2 Normative references ... 6
3 Terms and definitions ... 6
4 Test method ... 11
4.1 General requirements ... 11
4.2 Downhill test ... 11
4.3 Traction test ... 11
4.4 Drum test ... 11
5 Test conditions ... 12
5.1 Environment ... 12
5.2 Test site ... 12
5.3 Test vehicle preparation ... 12
6 Downhill test ... 14
6.1 General requirements ... 14
6.2 Test ramp ... 14
6.3 Standard test parameters ... 14
6.4 Adjustment of specific test parameters ... 15
6.5 Test specifications ... 19
6.6 Determination of results ... 20
7 Traction test ... 20
7.1 General requirements ... 20
7.2 Test roads ... 20
7.3 Standard test parameters ... 21
7.4 Adjustment of specific test parameters ... 21
7.5 Test requirements ... 21
7.6 Data processing and result determination ... 22
8 Drum test ... 24
8.1 General requirements ... 24
8.2 Test bench ... 24
8.3 Standard test parameters ... 25
8.4 Adjustment of specific test parameters ... 26
8.5 Test requirements ... 26
8.6 Data processing and determination of results ... 27
Appendix A (Normative) Symbols and definitions ... 30
Appendix B (Informative) Test method for deceleration and thermal decay of retarder ... 32
B.1 Overview ... 32
B.2 Road test ... 32
B.3 Drum test ... 34
Foreword
This standard was drafted in accordance with the rules given in GB/T
1.1-2009.
This standard is compiled through redrafting method with reference to ISO 12161.2006 ?€?Road vehicles - Endurance braking systems of motor vehicles and towed vehicles - Test procedures?€?. AND its consistency with ISO
12161.2006 is non-equivalent.
This standard was proposed by the Ministry of Industry and Information
Technology.
This standard shall be under the jurisdiction of the National Automotive Standardization Technical Committee (SAC/TC 114).
The drafting organizations of this standard. China Automotive Technology Research Center, China Heavy Vehicle Group Co., Ltd., Beiqi Foton
Automobile Co., Ltd., Shaanxi Fast Gear Co., Ltd., Jacobs (Suzhou) Vehicle Control System Co., Ltd., Shenzhen TERCA technology Co., Ltd.
The main drafters of this standard. Liu Di, Jin Yefu, Wang Zhao, Deng
Xianghong, Li Tengteng, Xie Jinzhong, Xu Zhiguang, Shi Hongyun, Liu Zhahan, Liu Yi, Kuang Zhitao, Peng Xi, Ling Zhaowei.
Performance test method for endurance
braking systems of commercial vehicles
1 Scope
This standard specifies the performance test method for the endurance
braking system of commercial vehicles.
This standard applies to commercial vehicles equipped with endurance
braking systems.
2 Normative references
The following documents are essential to the application of this document. For the dated documents, only the versions with the dates indicated are applicable to this document; for the undated documents, only the latest version (including all the amendments) are applicable to this Standard.
GB/T 5620 Road vehicles - Braking of automotive vehicles and their trailers - Vocabulary
GB 12676-2014 Technical requirements and test methods for commercial
vehicle and trailer braking systems
3 Terms and definitions
The terms and definitions as defined in GB/T 5620 and GB12676-2014 as well as the following terms and definitions apply to this document.
3.1
Endurance braking system
It refers to a supporting braking system which can provide and maintain long-term braking performance without significant reduction of performance. Note 1. ?€?Endurance braking system?€? means the entire system including the control unit. This definition does not include a power regenerative braking system.
It refers to an energy conversion device that is independent of the service brake or is supplemented to the service brake to provide an endurance
braking action for vehicle speed control.
3.1.2.1 Retarder classification
3.1.2.1.1
Primary retarder
It refers to the retarder installed in front of the powertrain transmission input shaft (including the input shaft), the endurance braking power of which is directly related to engine speed.
3.1.2.1.2
Secondary retarder
It refers to the retarder installed between the powertrain transmission input shaft (including the input shaft) and the transmission shaft, the endurance braking power of which is directly related to engine speed.
Note. The retarder associated with the non-drive shaft is also classified as a rear retarder.
3.1.2.1.3
Other retarders
It refers to the retarder which does not comply with the classification in 3.1.2.1.1 or 3.1.2.1.2.
3.1.2.2 Retarder type
3.1.2.2.1
Combustion engine retarder
3.1.2.2.1.1
Engine braking
When the engine is connected to the drive wheel, the vehicle is slowed
down by making the engine dragging through reducing or stopping fuel
supply and air supply.
3.1.2.2.1.2
Note 1. The equivalent energy is calculated using the following equation, wherein the horizontal distance is regarded as the ramp length/travel
distance (6 km).
Type II test. Wequ, II = Wdiss, II = m ?? g ?? 6000 ?? (0.06 - 0.01)
Type IIA test. Wequ, IIA = Wdiss, IIA = m ?? g ?? 6000 ?? (0.07 - 0.01)
4 Test method
4.1 General requirements
Based on the specific test conditions and measuring equipment, it may choose any methods as listed in 4.2 ~ 4.4 to assess the vehicle endurance braking performance.
4.2 Downhill test
...

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