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
4.2.1 Recirculating ball electronically controlled hydraulic power steering gear.
4.2.1.1 Forced steering. There must be no abnormal conditions during the test;
there must be no damage to the assembly.
4.2.1.2 Overpressure. No extravasation shall occur during the test. The shell
shall neither be cracked nor broken.
4.2.1.3 Reverse fatigue. There must be no extravasation and other abnormal
conditions during the test. There must be no damage to the assembly.
4.2.1.4 Reverse overload. Same as 4.2.1.3.
4.2.1.5 Wear resistance. There must be no extravasation and other abnormal
conditions during the test. After the test, the free clearance is ≤ 12°; the
assembly must not be damaged.
4.2.2 Rack and pinion electronically controlled hydraulic power steering gear.
4.2.2.1 Forced steering. The assembly must not be damaged.
4.2.2.2 Overpressure. During the test, the assembly shall be free from damage,
extravasation, or other abnormal conditions.
4.2.2.3 Reverse fatigue. The internal leakage meets the requirements; there
must be no leakage, damage, or falling off of seals.
4.2.2.4 Reverse overload. Same as 4.2.2.2.
4.2.2.5 Forward steering muddy water durability. Same as 4.2.2.3.
5.1.1 The bench installation type and test conditions of the assembly.
5.1.1.1 When testing the assembly, refer to the layout of the whole vehicle OR
install it straightly on the test bench. The fuel tank is allowed to use the test
bench fuel tank. The absolute filtration accuracy of the filter shall not be less
than 20 µm. Other devices are allowed to be replaced by the devices, which
are equipped on the test bench. For the vehicle speed signal, which is input to
the controller, it may be a pulse frequency signal or a network digital signal.
5.1.1.2 The oil used for the test shall meet the requirements of the assembly
manual. The oil temperature for performance test is (50 ± 5) °C. The oil
temperature for reliability test is (80 ± 5) °C. The test flow shall be based on the
rated flow Qn, which is specified in the assembly manual or design.
5.1.1.3 For the DC power supply for the test, use an automobile battery OR a
rectified stabilized power supply, which has a ripple coefficient of not greater
than 0.1%, OR the above two power supplies connected in parallel. When the
test voltage is not specified, the 12 V electrical system is (14 ± 0.1) V; the 24 V
electrical system is (28 ± 0.2) V.
5.1.2 Accuracy of the test instrument.
a) The error of the pressure test system is not more than 1%.
b) The error of the flow test system is not more than 1%.
c) The error of the angle test system is not more than 0.5°.
d) The error of the displacement test system is not more than 0.1 mm.
e) The error of the torque test system is not more than 1%.
f) The error of the force test system is not more than 1%.
g) The error of the current test system is not more than 1%.
h) The error of the voltage test system is not more than 1%.
i) The error of the noise test system is not more than ±2 dB.
j) The error of the temperature test system is not more than ±1 °C.
k) The error of the humidity test system is not more than 10% RH.
5.1.3 Test method.
For the recirculating ball AND rack and pinion electronically controlled hydraulic
power steering gears, take 3 sets from each to carry out all performance tests.
e) During the test, carry out measurement and data processing, respectively
taking the 90% range of the left and right maximum rotation angles;
f) Draw the relationship curve, BETWEEN the input torque M AND the
rotation angle θ (as shown in Figure 1).
5.2.1.3 Free clearance.
a) Install the assembly on the test bench. Rigidly fix the output end in the
middle position;
b) Rotation speed at the input end: ≤ 0.25 r/min;
c) Measure the angle that the input end turns, when the pressure at the fuel
inlet of the assembly increases by 0.1 MPa, in both directions.
5.2.1.4 Function.
a) Install the assembly on the test bench;
b) At the input end, apply a resistance torque, which is equivalent to one-
third of the maximum resistance torque of the assembly;
c) Rotate the input end within the full stroke, to feel smoothness and
continuity; meanwhile check the return of the steering control valve.
5.2.1.5 Return ability. Under the condition that the controller receives the 30
km/h vehicle speed signal, perform the test according to the following methods:
a) Install the assembly on the test bench, with the input end under no load;
b) In the case of presence of power, apply a return load of 6% of the
maximum output torque, at the output end;
c) Respectively measure the time for the output end to return, FROM the two
extreme positions TO the middle position; take the longer time, as the
return time.
the output terminal in the middle position. The flow rate is 0.5Qn. Rotate the
input shaft. Draw the relationship curve between input shaft torque and rotation
angle.
5.2.2.12 Noise.
Under the condition that the controller receives the 0 km/h and Vmax vehicle
speed signals, the tests are carried out according to the following methods:
a) Install the assembly on the test bench. The installation condition is
equivalent to the actual vehicle;
b) Drive the input end, so that the oil pressure at the oil inlet is 0.5 pz and pz,
respectively;
c) At the oil temperature of 50 °C, 80 °C, 100 °C, respectively, complete the
test; the test environment noise is less than or equal to 30dB(A);
d) Use the sound level meter, to measure the sound value, at the 100 mm
spherical surface, from the oil inlet of the control valve.
5.2.3 Electronically controlled device.
For the recirculating ball AND rack and pinion electronically controlled hydraulic
power steering gears, they shall meet the test method of the electronically
controlled device.
5.2.3.1 Self-check function.
Install the electronically controlled device, under test, on the test bench. The
electronically controlled device will work normally, to simulate various fault
conditions set. Check whether the fault display lamp or the fault code alarm
signal is normal.
5.2.3.2 Voltage fluctuations.
The controller is connected to a power supply, which has adjustable output
power. In the case of 12 V power system, the power supply voltage changes at
(10.8 ~ 16.0) V. In the case of 24 V power system, the power supply voltage
changes at (21.6 ~ 32.0) V.
5.2.3.3 Resistance to reverse polarity of power supply.
Connect the controller, as a load, normally. In the non-working state, when the
input power voltage is the re...