GB/T 34597-2017 English PDF (GBT34597-2017)

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GB/T 34597-2017: Passenger cars -- Stopping distance at straight-line braking with ABS -- Open loop test method
GB/T 34597-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.40
T 24
Passenger cars - Stopping distance at straight-line
braking with ABS - Open loop test method
(ISO 21994:2007, Passenger cars - Stopping distance at straight-line braking
with ABS - Open-loop test method, NEQ)
ISSUED ON: OCTOBER 14, 2017
IMPLEMENTED ON: MAY 01, 2018
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 ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Test conditions ... 5
5 Test requirements ... 7
6 Data processing and results analysis ... 11
Annex A (informative) Test report - Vehicle information ... 16
Annex B (informative) Test report - Test conditions and test results ... 18
Annex C (informative) Test sequence, specific terms and background
information ... 20
Annex D (normative) Calculation method for F_ABS ... 25
Foreword
This Standard is drafted in accordance with the rules given in GB/T 1.1-2009.
This Standard is developed using the redrafting method and referring to ISO
21994:2007 “Passenger cars - Stopping distance at straight-line braking with
ABS - Open-loop test method”. The degree of consistency with ISO 21994:2007
is non-equivalent.
This Standard was proposed by Ministry of Industry and Information
Technology of the People's Republic of China.
This Standard shall be under the jurisdiction of National Technical Committee
of Auto Standardization (SAC/TC 114).
Drafting organizations of this Standard: Technology Center of Dongfeng Motor
Group Corporation, Dongfeng Motor Group Corporation, Technology Center of
China FAW Group Co., Ltd., Pan Asia Automotive Technology Center Co., Ltd.,
China Automotive Technology Research Center, Bosch Automotive Parts
(Suzhou) Co., Ltd., Wuhan Yuanfeng Automotive Electronic Control System Co.,
Ltd., National Automobile Quality Supervision and Test Center (Guangdong).
Main drafters of this Standard: Zhang Shemin, Zhang Yaoju, Chen Huarong, Ye
Xiaoming, Yang Guoan, Chen Ji, Wen Tao, Wang Xuanfeng, Yuan Xuliang, Liu
Di, Tian Feng, Lin Wentao, Wang Weiwei, Xiao Wenjian.
Passenger cars - Stopping distance at straight-line
braking with ABS - Open loop test method
1 Scope
This Standard specifies a test method for measuring the brake distance of
vehicles equipped with the anti-lock braking system (ABS) when braking during
straight travelling.
This Standard is applicable to M1 vehicles specified in GB/T 15089. N1 vehicles
may refer to this Standard.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
GB/T 5620 Road vehicles - Braking of automotive vehicles and their trailers
- Vocabulary
GB/T 15089 Classification of power-driven vehicles and trailers
GB 21670 Technical requirements and testing methods for passenger car
braking systems
QC/T 556 Automotive brakes - Temperature measurement and
thermocouple installation
ISO 8855 Road vehicles - Vehicle dynamics and road-holding ability -
Vocabulary
ISO 15037-1:2006 Road vehicles - Vehicle dynamics test methods - Part 1:
General conditions for passenger cars
3 Terms and definitions
For the purpose of this document, the terms and definitions defined in GB/T
5620, GB/T 15089, GB 21670, ISO 8855, ISO 15037-1:2006 and the following
C.2.3.
4.4 Environmental conditions
4.4.1 Ambient wind speed
Ambient wind speed (regardless of wind direction) shall not exceed 3 m/s.
When the wind speed is in the range of 3 m/s to 5 m/s, the same number of
measurements shall be made in both directions of the track, and the total
number of measurements remains the same.
4.4.2 Ambient temperature
The ambient temperature shall be between 5 °C and 35 °C. The variation in
temperature during the test shall not exceed 10 °C.
4.4.3 Road surface temperature
During the test, the variation in road surface temperature shall not exceed 10 °C.
4.5 Test vehicle
4.5.1 Vehicle condition
The condition of the test vehicle shall be in accordance with the vehicle
manufacturer's specifications, particularly with respect to the brake system, the
suspension geometries, power train (e.g. differentials and locks) configuration
and tyres used.
4.5.2 Tyres
4.5.2.1 Winter tyres shall not be used for test.
4.5.2.2 Generally, new tyres shall be used for test. If no new tyres are used, it
is required that the tyre shall show a steady wear condition with a tread depth
of at least 90 % of the original value across the whole breadth of the tread and
around the whole circumference of that of the new tyre.
4.5.2.3 Tyres shall be fitted on the test vehicle according to the manufacturer’s
specifications. If not specified otherwise by the tyre manufacturer, tyres shall be
fitted on the test vehicle or on an equivalent vehicle and run in for at least 150
km on a road surface with high adhesion coefficient. During running-in, there
shall be no violent operation such as acceleration or braking with a longitudinal
acceleration or deceleration exceeding 3 m/s2 and cornering and hitting the
kerb with a lateral acceleration exceeding 3 m/s2. Thereafter, tyres shall be
fitted at the same position on the vehicle for tests.
4.5.2.4 Tyres shall be manufactured not more than one year before the test.
5.4 Test preparation
5.4.1 Test road surface requirements
5.4.1.1 To ensure that the test results are comparable, the test shall be carried
out in the same area on the test road.
5.4.1.2 To avoid road contamination or damage during long-term operation, the
initial braking position shall vary on the trajectory when starting a new test.
5.4.2 Tyres and brake system
Before the test begins, the tyres and brake discs shall be subjected to the
following operations on the test road surface:
a) The test vehicle carries out 5 ABS brakings with an initial speed of 100
km/h and a stop speed of 0 km/h. The initial temperature of the brake discs
shall be less than 120 °C of each braking;
b) Cooling down the tyres (normal ride for about 10 km recommended).
5.5 Measurement requirements
5.5.1 Brake temperature
Before the start of each measurement, the initial temperature of the front brake
discs shall be between 80 °C and 120 °C, the initial temperature of the rear
brake discs shall be lower than 120 °C, and the initial temperature of the brake
drums shall be lower than 100 °C. The temperature measurement of brakes is
carried out according to the requirements of QC/T 556.
5.5.2 Initial driving condition
During the steady-state straight ahead run of the vehicle (see 6.2.2 of ISO
15037-1:2006), the longitudinal acceleration shall not exceed 0.3 m/s2 and the
yaw rate shall not exceed 0.5°/s.
The vehicle speed during braking operation is (100 ± 2) km/h. To minimize
dynamic effects, the vehicle shall maintain a speed of 100 km/h for at least 1.5
s before braking.
Depending on the vehicle transmission type, one of the following operation
modes shall be selected:
a) automatic transmission: standard drive mode “D”;
b) manual transmission: disengaging before the braking begins.
The vehicle t...