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QC/T 972-2014 English PDF

QC/T 972-2014_English: PDF (QC/T972-2014)
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QC/T 972-2014English200 Add to Cart 0--9 seconds. Auto-delivery Technical requirements and test method for motor vehicle. electronically controlled hydraulic power steering gear Valid QC/T 972-2014


BASIC DATA
Standard ID QC/T 972-2014 (QC/T972-2014)
Description (Translated English) Technical requirements and test method for motor vehicle. electronically controlled hydraulic power steering gear
Sector / Industry Automobile & Vehicle Industry Standard (Recommended)
Classification of Chinese Standard T23
Classification of International Standard 43.040.60
Word Count Estimation 19,164
Date of Issue 2014/5/6
Date of Implementation 2014/10/1
Quoted Standard GB/T 2423.17; GB/T 2423.22; GB/T 2423.34; GB/T 5179; GB/T 18655-2010; GB/T 21437.2-2008; QC/T 306
Drafting Organization Jiangmen Xingjiang Steering Gear Co., Ltd.
Administrative Organization National Automotive Standardization Technical Committee
Regulation (derived from) Ministry of Industry and Information Technology - Announcement 2014 No 32.
Issuing agency(ies) Ministry of Industry and Information Technology of the People's Republic of China
Summary This Standard specifies the technical requirements and test methods for assembly electrically controlled hydraulic power steering car. This Standard applies to cars electronically controlled hydraulic power steering assembly, including recirculating ball


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 reverse voltage value, reverse the power polarity for 1 min. Reverse connection voltage value: The 12 V electrical system is (14 ± 0.1) V; the 24 V electrical system is (28 ± 0.2) V. Under the condition that the controller receives the 0 km/h vehicle speed signal, the assembly is tested according to the following methods: a) Install the assembly on the test bench. Keep the input end in the middle position, with a clearance of about 0.5°. Use a stopper to limit the position; b) Load bidirectionally at the output end, to ensure that the working pressure is the maximum working pressure; c) The frequency is (0.6 ~ 1.2) Hz; d) After the completion of 1 million alternative loads, continue the test according to 5.2.1.4 after the test. 5.3.1.4 Reverse overload. Under the condition that the controller receives the Vmax vehicle speed signal, the assembly is tested according to the following methods: a) Install the assembly on the test bench; b) In the presence of power, rigidly fix the input end at the middle position. At the connection between the steering rocker and the straight tie rod, quickly apply the load, at 90° to the center line of the steering rocker, until the load is equivalent to 3 times of the maximum output force; stop the test; c) Complete it in two directions, respectively. After the test, continue to carry out the test according to 5.2.1.4. 5.3.1.5 Wear resistance. Input the vehicle speed signal to the controller, at a frequency of 0.5 Hz, according to the speed change mode of 0 km/h ~ Vmax ~ 0 km/h. Under the condition of normal operation of the electronically controlled valve, carry out the test according to the following methods: a) Install the assembly on the test bench; b) The test oil pressure is the maximum working pressure. Make the steering rocker reach the maximum output torque, during the test; c) The input end runs at a speed of (20 ~ 30) r/min. The input end's angle is greater than or equal to 90% of the total angle; d) After completing 25000 cycles, continue to test according to 5.2.1.3, 5.2.1.4, 5.2.1.6, 5.2.1.7 after the test, to check whether the assembly is working properly. completed, conduct a steering force characteristic test, to check whether the device is working properly. 5.3.3.2 Electromagnetic compatibility. a) Transient immunity. When the electric control device is energized, carry out the transient immunity test, of test pulse 1, 2a, 2b, 3a, 3b, 4, in accordance with the relevant requirements of 4.4 for transient immunity test, in GB/T 21437.2-2008. The grade of test impulse is grade III (in Appendix A). b) Electromagnetic harassment. When the electric control device is energized, respectively carry out the following two tests, according to the relevant requirements of the measurement of parts and modules, in Chapter 6 of GB/T 18655-2010: 1) Measurement of conducted emission of parts; 2) Measurement of radiation emission of parts. 5.3.3.3 Temperature resistance. a) Resistance to low temperature. Place the electrically controlled device, at a temperature of (-40 ± 3) °C, for 96 h. After the test, place it at room temperature for 12 h. Continue to test according to the test method of steering force characteristics, to check whether the assembly is working properly. b) Resistance to high temperature. Place the electrically controlled device, at a temperature of (125 ± 3) °C, for 96 h. After the test, place it at room temperature for 12 h. Continue to test according to the test method of steering force characteristics, to check whether the assembly is working properly. c) Resistance to temperature changes. Carry out the test, according to the test Na: test method of temperature change, in GB/T 2423.22. Cool the temperature control box, to a low temperature of (-40 ± 2) °C. Put it in the electrically controlled device for 2 h. THEN, put it in a high temperature environment of (65 ± 2) °C for 2 h, reciprocating 5 cycles. After the test, continue to test, according to the test method of steering force characteristics, to check whether the assembly is working properly. 5.3.3.4 Resistance to combined temperature/humidity cycle. Carry out test, according to the relevant requirements of test Z/AD: test method of combined temperature/humidity cycle, in GB/T 2423.34. After the test, continue to test, according to the test method of steering force characteristics, ......

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