GB 17675-2021 English PDF (GB17675-2021)

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GB 17675-2021: Steering system of motor vehicles -- Basic requirements
GB 17675-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.50
T 23
Replacing GB 17675-1999
Steering system of motor vehicles -
Basic requirements
ISSUED ON: FEBRUARY 20, 2021
IMPLEMENTED ON: JANUARY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 7 
2 Normative references ... 7 
3 Terms and definitions ... 8 
3.1 Basic terms ... 8 
3.2 Terms of functional safety ... 15 
4 Technical requirements ... 17 
4.1 Requirements for motor vehicles ... 17 
4.2 Requirements for trailers ... 18 
4.3 Failure provisions ... 20 
4.4 Alarm signals ... 22 
5 Test methods ... 24 
5.1 Test conditions ... 24 
5.2 Tests for motor vehicles ... 24 
5.3 Tests for trailers ... 25 
6 Implementation date ... 26 
Appendix A (Normative) Supplementary regulations for vehicles equipped with
auxiliary steering equipment (ASE) ... 27 
Appendix B (Normative) Functional safety requirements ... 30 
Appendix C (Normative) Requirements for trailers equipped with purely
hydraulic steering transmission equipment ... 37 
Appendix D (Normative) Special requirements for power supply of steering
system of tractor-trailer combination ... 38 
Steering system of motor vehicles -
Basic requirements
1 Scope
This Standard specifies the terms and definitions, technical requirements, and
test methods of the steering system of motor vehicles.
This Standard applies to categories M, N vehicles and category O trailers
specified in GB/T 15089.
This Standard does not apply to:
- Pneumatic transmission steering system;
- Vehicles with autonomous steering system as defined in 3.1.1.5.
2 Normative references
The following documents are indispensable for the application of this document.
For the dated references, only the editions with the dates indicated are
applicable to this document. For the undated references, the latest edition
(including all the amendments) are applicable to this document.
GB/T 3730.1 Motor vehicles and trailers - Types - Terms and definitions
GB/T 3730.2 Road vehicle - Masses - Vocabulary and codes
GB/T 3730.3 Motor vehicles and towed vehicles - Dimensions of vehicles -
Terms and definitions
GB/T 5053.3 Road vehicles - Connectors for the electrical connection of
towing and towed vehicles - Definitions tests and requirements
GB/T 5563 Rubber and plastics hoses and hose assemblies - Hydrostatic
testing
GB/T 7939 Hydraulic fluid power - Hose assemblies - Test methods
GB/T 9574 Rubber and plastics hoses and hose assemblies - Ratios of proof
and burst pressure to maximum working pressure
GB/T 12540 Minimum turning circle diameter, minimum turning clearance
Another additional equipment for adjusting the steering quality of the vehicle,
which can make the steered wheels and/or the wheels (front and/or rear) on
other axles adjust the same or opposite steering angles, in addition to the
steering angle provided by the main steering equipment, on categories M and
N vehicles.
3.1.3.2 Trailers
3.1.3.2.1
Trailers self-tracking steering equipment
The equipment which changes the steering angle of one or more wheels only
when the trailer wheels are subjected to force and/or moment from the ground.
3.1.3.2.2
Articulated steering
The equipment in which the steering movement uses the articulated
mechanism between tractors and trailers, to form a relative angle between the
longitudinal axis of tractors and trailers, and to change the driving direction of
the tractor to generate steering forces, when the vehicle is running.
3.1.3.2.3
Self-steering
The equipment in which the steering movement uses the angle formed by the
longitudinal axis of trailer frame or alternative load and the longitudinal axis of
draw-bar and turntable frame, to change the driving direction of the tractor to
generate steering forces, when the vehicle is running.
3.1.3.2.4
Additional steering equipment
The equipment, independent of the main steering equipment of the tractor,
which selectively adjusts the steering angle of one or more axles of the trailer
according to different control purposes.
3.1.3.2.5
Full-power steering equipment
The equipment in which the steering forces are completely provided by one or
more energy supply components.
3.1.5.4
Hybrid steering transmission
Part of the steering forces are transmitted in one of the above-mentioned ways;
while the other part is transmitted in another way.
Note: However, if the mechanical part used for transmission is only for providing the
driver's sense of road, and the steering forces transmitted by it can be ignored for
the whole system, it shall be regarded as hydraulic or electric steering transmission.
3.1.6
Trailers steering electric control line
The electrical connection part for the steering control function of the trailer.
Note: It includes data communication cables for trailer control, wires and connectors for
power supply.
3.2 Terms of functional safety
3.2.1
Functional safety concept
Functional safety requirements and related information needed to achieve
safety goals.
Note: For example, safety measures implemented to ensure system integrity and safe
operation in fault and non-fault modes.
3.2.2
Unit
The smallest part of a system component which can be identified, analyzed, or
replaced as a single entity.
3.2.3
Electronic control system
The combination of a series of units which coordinate the realization of vehicle
control functions through electronic data processing.
Note: The system is usually controlled by software; composed of independent functional
components such as sensors, controllers and actuators; and connected by
without disassembly. Unless specially designed, any part of the steering
transmission equipment shall not limit the maximum steering angle.
4.1.5 The vehicle electrical control system related to the steering of the motor
vehicle must not affect the steering function due to electromagnetic interference.
And it shall meet the technical requirements in GB 34660.
4.1.6 The adjustable components in the steering transmission system shall be
lockable.
4.1.7 The steered wheels of motor vehicles shall not only be the rear wheels.
4.1.8 The steering system can share the same energy supply with other
systems. However, if any system that shares the same energy with the steering
system fails, the steering system shall still meet the relevant steering functions
in the case of fault in 4.3.
4.1.9 The functional safety requirements of the steering electronic control
system shall be formulated in accordance with GB/T 34590 (all parts); shall
meet the requirements of Appendix B.
4.2 Requirements for trailers
4.2.1 When the tractor-trailer combination goes straight ahead, the trailer shall
be in the same driving direction as the tractor. If the trailer cannot automatically
maintain a straight-line driving, it shall be equipped with corresponding
adjustment devices.
4.2.2 The rear wheels of the semi-trailer may be steered wheels.
4.2.3 The tractor is driving straight on a level road. Within the maximum design
speed range, when the driver has no steering correction behavior, and the
steering system has no abnormal vibration, the trailer shall not affect the
straight-line driving performance of the vehicle due to its steerin...