QC/T 972-2014 English PDF (QCT972-2014)

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QC/T 972-2014: Technical requirements and test method for motor vehicle. electronically controlled hydraulic power steering gear
QC/T 972-2014
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
T 23
Technical requirements and test method for motor
vehicle-electronically controlled hydraulic power
steering gear
ISSUED ON: MAY 06, 2014
IMPLEMENTED ON: OCTOBER 01, 2014
Issued by: Ministry of Industry and Information Technology of PRC
Appendix:
Number, name, and date of implementation of 32 automotive industry
standards
No.
Standard
number
Standard name
Number of
standards replaced
Date of
implementation
1 QC/T 231-2014
Specification of kick-starter for
motorcycles and mopeds
QC/T 231-1997
October 01,
2014
2 QC/T 233-2014
Performance and measurement
method for static intensity of
motorcycles and mopeds
QC/T 233-1997
October 01,
2014
3 QC/T 66-2014
Wet clutch for moped and
motorcycles
QC/T 66-1993
October 01,
2014
4 QC/T 962-2014
Technical specifications for coating of
motorcycles and moped
October 01,
2014
5 QC/T 680-2014
General technical specifications for
voltage regulators for motorcycles and
moped
QC/T 680-2002
October 01,
2014
6 QC/T 963-2014
Drum brakes of motorcycles and
mopeds wheels
October 01,
2014
7 QC/T 234-2014
General technical specifications for
steering shaft for motorcycles and
moped
QC/T 234-1997
October 01,
2014
8 QC/T 964-2014
The strength of plastic seats and their
anchorages for city buses
October 01,
2014
9 QC/T 644-2014
Technical specifications for
automotive metallic fuel tank
QC/T 644-2000
QC/T 488-2000
October 01,
2014
10 QC/T 965-2014
Driver of electric rear-view mirrors for
motor vehicles
October 01,
2014
11 QC/T 966-2014
Technical specifications for
automotive plastic parts coatings
October 01,
2014
12 QC/T 459-2014 Truck with loading crane QC/T 459-2004
October 01,
2014
13
QC/T 29106-
2014
Technical specification of automobile
wire harness
QC/T 29106-2004
October 01,
2014
14 QC/T 198-2014
General technical specification for
automotive switch
QC/T 198-1995
October 01,
2014
15 QC/T 220-2014
Technical specifications for
automotive fusible links
QC/T 220-1996
October 01,
2014
16 QC/T 967-2014 Port fuel injector for gasoline engine
October 01,
2014
17 QC/T 968-2014
Determination methods of platinum,
palladium, and rhodium contents in
metallic catalytic converters
October 01,
2014
18 QC/T 969-2014
Interior truck release for compartment
of a passenger car
October 01,
2014
19 QC/T 636-2014
Electric window regulator specification
for vehicles
QC/T 636-2000
October 01,
2014
20 QC/T 970 2014
Passenger car air filter technical
specification
October 01,
2014
21 QC/T 971-2014 Specification of air filter element for October 01,
Table of Contents
Foreword ... 7 
1 Scope ... 8 
2 Normative references ... 8 
3 Terms and definitions ... 9 
4 Technical requirements ... 10 
5 Test method ... 13 
Technical requirements and test method for motor
vehicle-electronically controlled hydraulic power
steering gear
1 Scope
This standard specifies the technical requirements and test method, for motor
vehicle-electronically controlled hydraulic power steering gear.
This standard applies to motor vehicle-electronically controlled hydraulic power
steering gear, including recirculating ball type electronically controlled hydraulic
power steering gear AND rack and pinion type electronically controlled
hydraulic power steering gear.
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) is applicable to this standard.
GB/T 2423.17 Environmental testing for electric and electronic products -
Part 2: Test method - Test Ka: Salt mist (idt IEC 60068-2-11:1981)
GB/T 2423.22 Environmental testing for electric and electronic products -
Part 2: Test methods Test N: Change of temperature (idt IEC 60068-2-
14:1984)
GB/T 2423.34 Environmental testing for electric and electronic products -
Part 2: Test methods - Test Z/AD: Composite temperature/humidity cyclic
test (idt IEC 60068-2-38:1974)
GB/T 5179 Terms and definitions of automotive steering system
GB/T 18655-2010 Vehicles boats and internal combustion engines - Radio
disturbance characteristics - Limits and methods of measurement for the
protection of on-board receivers (CISPR25:2008, IDT)
GB/T 21437.2-2008 Road vehicles - Electrical disturbances from conduction
and coupling - Part 2: Electrical transient conduction along supply lines only
gear
The electronically controlled hydraulic power steering gear, whose
transmission pair is recirculating ball type.
3.7
Rack and pinion electronically controlled hydraulic power steering
gear
The electronically controlled hydraulic power steering gear, whose
transmission pair is rack and pinion type.
3.8
Maximum speed Vmax
The maximum speed of the vehicle equipped with the assembly. The unit is
km/h.
4 Technical requirements
4.1 Performance
4.1.1 Recirculating ball electronically controlled hydraulic power steering gear.
4.1.1.1 The total number of turns of the steering gear AND the angle of the
rocker shaft shall meet the design requirements.
4.1.1.2 No-load steering torque. For the variation range of the mean value of
the left and right steering torques, it shall meet the design requirements. For
the variation range from the maximum value to the minimum value, it shall meet
the design requirements. For the variation range of adjacent crests and troughs
in the curve, it shall meet the design requirements.
4.1.1.3 Free clearance ≤ 5°.
4.1.1.4 Function. In the process of rotating the input end, it feels smooth, without
jamming; meanwhile the steering control valve can automatically return.
4.1.1.5 Return ability. The return time is ≤ 5 s.
4.1.1.6 Steering force characteristics. The steering torque and characteristic
curve, at the maximum working pressure, shall meet the design requirements.
The symmetry of the curve shall be ≥ 85%.
4.1.1.7 The internal leakage shall meet the design requirements. After the
changes within the range of (10.8 ~ 16.0) V (for 12V power system) OR (21.6
~ 32.0) V (for 24 V power system), the controller shall be able to work normally.
4.1.3.3 Resistance to reverse polarity of power supply. The controller shall be
able to withstand the reverse polarity test of the power supply, for 1 min, without
damage. The controller shall be able to work normally after the test.
4.1.3.4 Withstand power supply overvoltage. The controller shall be able to
withstand the power supply overvoltage test, for 1 min, without damage. The
controller shall be able to work normally after the test.
4.1.3.5 Drop. The controller shall be able to work normally, after the drop test.
According to the test method of steering force characteristic, it meets the
requirements for steering force characteristic performance. It allows partial
damage of the control box AND deformation of the bracket.
4.2 Reliability <...