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GB 21670-2008: Technical requirements and testing methods for passenger car braking systems---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB21670-2008
ICS 43.040.40
T 24
NATIONAL STANDARD
P GB 21670-2008
Technical Requirements and Testing Methods
for Passenger Car Braking Systems
Issued on. APRIL 25, 2008
Implemented on. NOVEMBER 1, 2008
Issued by. General Administration of Quality Supervision, Inspection
and Quarantine (AQSIQ);
Standardization Administration of China (SAC).
GB
Table of Contents
1 Scope... 6
2 Normative References... 6
3 Terms and Definitions... 6
3.1 Basic Terms and Definitions... 6
3.2 Terms and Definitions for Complex Electronic Vehicle Control System... 11
4 Structure and Function Requirements... 12
4.1 Braking Equipment... 12
4.2 Characteristics of Braking Systems... 13
5 Test conditions and performance requirements... 22
5.1 Testing Conditions... 22
5.2 Performance Requirements... 26
5.3 Response Time... 28
5.4 Provisions Relating to Energy Sources and Energy Storage Devices (Energy
Accumulators) -- Hydraulic Braking Systems with Stored Energy... 28
5.5 Distribution of Braking among the Axles of Vehicles... 29
5.6 Test Requirements for Vehicles Fitted with Anti-Lock Systems (ABS)... 33
6 Vehicle Type Approval and Expansion... 39
6.1 Vehicle Type Approval... 39
6.2 Expansion of approved vehicle type... 40
7 Test Methods... 40
7.1 Test Site and Equipment... 41
7.2 Test Vehicles... 41
7.3 Static Inspection... 41
7.4 Dynamic Test... 51
Appendix A (Normative) Symbols and Definitions... 64
Appendix B (Normative) Monitoring Regulation for SOC of Traction Battery... 67
Appendix C (Normative) Inertia Dynamometer Test Method for Brake Linings... 68
Appendix D (Normative) Special Requirements to be Applied to the Safety Aspects of
Complex Electronic Vehicle Control Systems... 70
Appendix E (Informative) Test Reports and Relevant Diagrams Requirements... 74
1 Scope
This standard specifies the structure, performance and test methods for braking system of
passenger cars (vehicle).
This standard is applicable to vehicles of category M1 as specified by GB/T 15089.
2 Normative References
The following standards contain the provisions which, through reference in this text,
constitute the provisions of this standard. For dated reference, the subsequent amendments
(excluding corrigendum) or revisions of these publications do not apply. However, the parties
who enter agreement according to these specifications are encouraged to study whether the
latest editions of these references are applicable. For undated references, the latest edition of
the normative document is applicable to these specifications.
GB 4094 Motor Vehicles-Symbols for Controls, Indicators and Tell-tales [GB 4094-1999,
eqv 93/91/EEC (78/316/EEC)]
GB/T 5620 Road vehicles -- Braking of automotive vehicles and their trailers --
Vocabulary (GB/T 5620-2002, idt ISO 611.1994)
GB 12981 Motor vehicle brake fluids (GB 12981-2003, ISO 4925.1978, MOD)
GB/T 14168 Motor vehicles -- Graphical symbols to designate brake fluid types (GB/T
14168-1993, eqv ISO 9128.1987)
GB/T 15089 Classification of Power-driven Vehicles and Trailers
GB/T 17619 Limits and methods of testing for immunity of electrical / electronic
sub-assemblies in vehicles to electromagnetic radiation
GB 18655 Vehicles boats and internal combustion engines -- Radio disturbance
characteristics -- Limits and methods of measurement for the protection of on-board receivers
(GB 18655-2002, idt IEC/CISPR 25.1995)
3 Terms and Definitions
For the purposes of this document, the terms and definitions in GB/T 5620 together with
the follows apply.
3.1 Basic Terms and Definitions
3.1.4
Transmission device
The combination of components comprised between the control and the brake and
linking them functionally. The transmission may be mechanical, hydraulic, pneumatic,
electric or mixed. Where the braking power is derived from or assisted by a source of energy
independent of the driver, the storage of energy (energy accumulator) in the system is
likewise part of the transmission.
3.1.5
Brake
The part in which the forces opposing the movement of the vehicle develop. It may be a
friction brake (when the forces are generated by friction between two parts of the vehicle
moving relatively to one another);
3.1.6
Different types of braking equipment
Equipment which differ in such essential respects as.
3.1.7
Component of the braking equipment
One of the individual parts which, when assembled, constitutes the braking equipment.
4 Structure and Function Requirements
4.1 Braking Equipment
4.1.1 General requirements
4.1.1.1 The braking equipment shall be so designed, constructed and fitted as to enable the
vehicle in normal use, despite the vibration to which it may be subjected, to comply with the
provisions of this Standard.
4.1.2 Functions of braking equipment
4.1.2.1 Service braking system
The service braking system shall make it possible to control the movement of the vehicle
and to halt it safely, speedily and effectively, whatever its speed and load, on any up or down
gradient. It shall be possible to graduate this braking action. The driver shall be able to
achieve this braking action from his driving seat without removing his hands from the
steering control.
4.1.3 The requirements of Appendix D are applied to the safety aspects of all complex
electronic vehicle control systems which provide or form part of the control transmission of
the braking function including those which utilize the braking system(s) for automatically
commanded braking or selective braking.
4.2 Characteristics of Braking Systems
4.2.1 The set of braking systems with which a vehicle is equipped shall satisfy the
requirements laid down for service, emergency and parking braking systems.
4.2.2 The systems providing service, emergency and parking braking may have common
components so long as they fulfill the following conditions.
4.2.3 The failure of a part of a hydraulic transmission system shall be signalled to the driver
by a device comprising a red tell-tale signal lighting up before or upon application of a
differential pressure of not more than 15.5 MPa between the active and failed brake
equipment, measured at the master cylinder outlet and remaining lit as long as the failure
persists and the ignition (start) switch is in the ‘on’ (run) position.
4.2.4 Where use is made of energy other than the muscular energy of the driver, there need
not be more than one source of such energy (hydraulic pump, air compressor, etc.), but the
means by which the device constituting that source is driven must be as safe as practicable.
4.2.6 The service braking system shall act on all wheels of the vehicle and shall distribute
its action appropriately among the axles.
4.2.7 In the case of vehicles equipped with electric regenerative braking systems of category
B, the braking input from other sources of braking, may be suitably phased to allow the
electric regenerative braking system alone to be applied, provided that both the following
conditions are met.
4.2.8 The action of the service braking system shall be distributed between the wheels of
one and the same axle symmetrically in relation to the longitudinal median plane of the
vehicle.
Compensation and functions, such as anti-lock, which may cause deviations from this
symmetrical distribution shall be declared.
5 Test conditions and performance requirements
5.1 Testing Conditions
5.1.1 General requirements
5.1.2 Road test conditions to determine vehicle braking performance
5.1.2.1 The vehicle’s condition as regards mass must be as prescribed for each type of test
and be specified in the test report.
5.1.4 Type-0 test (ordinary performance test with cold brakes)
5.1.4.1 General requirements
5.1.4.1.1 The average temperature of the service brakes on the hottest axle of the vehicle,
measured inside the brake wear linings or on the braking path of the disc or drum, is between
65 and 100 °C prior to any brake application.
4 The manufacturer shall provide the testing organization with the family of braking curves permitted by the
automatic control strategy. These curves (family) may be verified by the testing organization.
5.2.2 Emergency braking
5.2.2.1 The performance of the emergency braking system shall be tested by the Type-0 test
5.2.3 Parking braking system
5.2.3.1 The parking braking system shall be capable of holding the laden vehicle stationary
on a 20% up or down gradient.
6 Vehicle Type Approval and Expansion
6.1 Vehicle Type Approval
From vehicle types of a group applied for approval, one or more vehicles with the
following characteristics shall be selected as representative to conduct all tests specified in
this standard.
6.1.1 Mass parameters
6.1.2 Axle load under unladen condition
Select the vehicle(s) with the maximal ratio of front axle load to rear axle load.
6.1.3 Suspension type
13 Until such test surfaces become generally available, a ratio R up to 2.5 is acceptable, subject to discussion with
the testing organization.
Select vehicles with different suspensions (suspensions of same type and different parts
shall be regarded ones of same type).
6.1.4 Axle spacing and wheel spacing
Select vehicles with the minimum axle spacing and the minimum wheel spacing.
6.2 Expansion of approved vehicle type
6.2.1 Where the change relevant to braking system is made on approved vehicle type, the
expansion approval application shall be carried out.
7 Test Methods
This standard specifies that static check shall be carried out firstly and then dynamic test.
In dynamic test, it is recommended that unladen test is carried out firstly and then laden test.
Type-I test shall be carried out after completing all dynamic tests.
Prior to starting static test and dynamic test, automatic wear compensation device may be
7.2 Test Vehicles
It shall be verified that test vehicles meet requirements of Section 6.1.
7.3 Static Inspection
7.3.5 Bench test
7.3.5.1 Under the laden condition of the vehicle, the energy storage at the normal operation
condition will not participate in the wheel fixation of braking action. Gradually increase the
control force, pipeline pressure or manipulation amplitude, simulate the necessary "failure"
state, test each axle, and inspect each wheel that can obtain the maximum braking force under
the conditions permitted by the test bench. Therein, the hydraulic power braking shall be
tested under the condition that parking braking is released.
7.3.5.2 It shall be inspected that the service braking and parking braking can be effectively
7.3.8 Electric regenerative braking inspection
7.3.8.1 As for the vehicle equipped with electric regenerative braking, the category of
electric regenerative braking shall be verified. The electric regenerative braking, a part of
service braking system, belongs to category B; the electric regenerative braking, not a part of
service braking system, belongs to category A.
7.4 Dynamic Test
7.4.1 General
7.4.1.1 Dynamic test shall be performed where the wind force will not affect the test results.
7.4.3 Unladen condition - basic performance test
7.4.3.1 Type-0 test for engine disconnected
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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