GB/T 12547-2009 English PDF (GBT12547-2009)

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GB/T 12547-2009: Minimum stable speed test method for motor vehicles
GB/T 12547-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.020
T 04
Replacing GB/T 12547-1990
Minimum Stable Speed Test Method for Motor Vehicles
ISSUED ON. MARCH 23, 2009
IMPLEMENTED ON. JANUARY 1, 2010
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine (AQSIQ);
Standardization Administration (SAC) of the People's
Republic of China.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Terms and Definitions ... 4 
4. Test conditions ... 4 
5 Test Procedures ... 5 
6 Test Results ... 6 
Annex A ... 7 
Foreword 
This standard replaces GB/T 12547-1990 "Motor vehicles - Minimum stable speed -
Test method".
Main differences between this standard and GB/T 12547-1990 are as follows.
-- Definition of minimum stable speed is added;
-- Existing velocity measurement instruments are adopted;
-- Contents of test conditions are added;
-- Contents of testing procedures are modified.
Appendix A of this standard is informative.
This standard was proposed by the National Development and Reform Commission.
This standard shall be under the jurisdiction of the National Technical Committee 114
on Road Vehicles of Standardization Administration of China.
Drafting organizations of this standard. National Automobile Quality Supervision
Testing Center (Xiangfan) and China Automotive Technology and Research Center.
Chief drafting staffs of this standard. Zhu Xin, Zhan Yongmao, Wang Zuguo, Chen
Jiaxin and Wang Xueping.
The previous edition replaced by this standard is as follows.
-- GB/T 12547-1990.
Minimum Stable Speed Test Method for Motor Vehicles
1    Scope 
This standard specifies the minimum stable speed test method for motor vehicles.
This standard is applicable to all kinds of motor vehicles. Automobile train may be
implemented by reference to this standard.
2      Normative References   
The following referenced documents are indispensable for the application of this
document. For dated reference, subsequent amendments (excluding corrigendum) or
revisions of these publications do not apply. However, all parties who enter into an
agreement according to this standard are encouraged to study whether the latest
edition of this document is applicable. For undated references, the latest editions of
the normative documents are applicable to this standard.
GB/T 12534 Motor Vehicles - General Rules of Road Test Method
GB/T 12543 Motor Vehicles - Acceleration Performance - Test Method
GB/T 12677 Motor vehicles - Technical condition - Inspection methods
3      Terms and Definitions 
For the purposes of this standard, the following terms and definitions apply.
3.1
Minimum stable speed
It refers to the minimum speed at which motor vehicles can travel steadily; this speed
can ensure the motor not stalled, transmitting mechanism not vibrated, motor vehicle
in steady and continuous acceleration, and the corresponding engine speed not
declined.
4.    Test conditions 
4.1 Measuring instruments
not be declined.
5.3 If the motor vehicle fails to meet those specified in Article 5.2, the stable speed
of the motor vehicle in 5.1 shall be increased properly, and repeat the test until the
minimum stable speed that meets those specified in Article 5.2 is found.
5.4 The testing shall be carried out back and force at least each 1 time.
5.5 The clutch shall not be cut off, so as to maintain the motor vehicle in stable
travelling; or the clutch shall not be made slipping in testing; and gear-shift is not
allowed.
6    Test Results 
6.1 Arithmetic average of the actual measurement speed shall be taken as the
minimum stable speed in this gear position of this motor vehicle.
6.2 The test record shall be filled in the Table of Appendix A.
Annex A 
(Informative)
Table A.1 Testing Record Table of Motor Vehicle Minimum Stable Speed
Model.
VIN.
Motor number.
Testing record table of motor vehicle minimum stable
speed
Motor idling speed.
Vehicle number.
Test date.
Test
instrument Specification/model
Instrument
number Manufacturer
Instrument
precision
Effective time
of verification
Verification
unit
Weather condition. Ambient temperature. Road surface conditions.
Air pressure. Relative humidity. Wind velocity. Wind direction.
Pneumatic pressure of front wheel. Pneumatic pressure of rear wheel.
Ready state of the sample
Description of inspection method deviation
Testing records.
Sequence
number Traveling Direction
Traveling
distance / m
Traveling
time/s
Average speed
/ (km/h)
Transmission
gear
Transfer case
gear
Motor speed
/ (r/min)
Minimum stable speed /(km /h)
Tester. Driver.