Test method for technical conditions of automobile electronically controlled hydraulic power steering assembly

Scope This standard specifies the technical conditions and test methods of automobile electronically controlled hydraulic power steering assembly. This standard applies to automotive electronically controlled hydraulic power steering assembly, including recirculating ball type electronically controlled hydraulic power steering assembly and rack and pinion type electronically controlled hydraulic power steering assembly. Normative references The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document. For undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 2423.17 Environmental testing of electrical and electronic products Part 2: Test method Test Ka: Salt spray (idt IEC60068-2-11:1981) GB/T 2423.22 Environmental testing of electrical and electronic products Part 2: Test method Test N: Temperature change (Idt IEC 60068-2-14: 1984) GB/T 2423.34 Environmental testing of electrical and electronic products Part 2: Test method Test Z/AD: Temperature/humidity combined cycle test method (idt IEC 60068-2-38: 1974) GB /T 5179 Automotive steering system terms and definitions GB 18655 Limits and measurement methods for radio disturbance characteristics used to protect on-board receivers (idt CISPR25) GB/T 21437.2 Road vehicle electrical disturbances caused by conduction and coupling Part 2: Alongside Electrical transient conduction of the power cord QC/T 306 Bench test method for automobile power steering control valve assembly QC/T XXXX Technical conditions and test methods for automobile hydraulic power steering gear Test method Performance test method Hydraulic power steering gear total number of turns, external Leakage shall be implemented in accordance with the relevant clauses of QC/T XXXX. The internal leakage, the ability to return to the right, the reverse drive load, and the no-load rotational torque are tested in accordance with the methods described in the relevant clauses of QC/T XXXX under the condition that the controller receives the 0km/h vehicle speed signal. Function test and vacuum test are carried out in accordance with the methods described in the relevant clauses of QC/T XXXX under the condition that the controller receives the Vmax vehicle speed signal. Steering gear stiffness, free clearance, and noise are tested in accordance with the methods described in QC/T XXXX relevant clauses under the condition that the controller receives 0km/h and Vmax vehicle speed signals. Steering force characteristics: Install the assembly on the test bench, and rigidly fix the output end in the straight driving position; in the case of assisted, within the range of 0～Vmax vehicle speed, input the speed signal to the controller at certain intervals; take 0.5 r/min rotate the input end in two directions separately, until the oil pressure reaches the maximum working pressure of the assembly; draw the relationship curve between the input torque and the working oil pressure under different vehicle speed signals, see Figure 1; a) draw separately Draw out the steering force characteristic curve under different vehicle speed signals; b) Measure the maximum left and right steering torque under different vehicle speed signals respectively; c) According to the calculation method of QC/T XXX (XXX stands for 306, the standard is being prepared), calculate them separately The symmetry of the steering force characteristic curve under different vehicle speed signals; the electronic control device failure alarm test installs the tested electronic control device on the test bench, the electronic control device works normally, simulates various failure conditions set, and checks the failure indicator or Whether the fault code alarm signal is normal. The voltage fluctuation test controller is connected to a power supply with adjustable output power. In the case of 12 V power system, the power supply voltage changes in the range of 10.8V to 16.0V; in the case of 24V power system, the power supply voltage changes in the range of 21.6V to 32.0V. Power supply polarity reversal resistance performance and power supply overvoltage resistance performance test The controller is connected normally as a load. In the non-working state, when the input power supply voltage is the reverse voltage value, the power supply polarity is reversed for 1 min. Reverse voltage value: 14V±0.1V for 12V power system; 28V±0.2V for 24V power system. Connect the controller power input terminal to +24V power supply (for 12V power system), the time is 1min; connect the controller power input terminal to +32V power supply (for 24V power system), the time is 1min. In the drop test, the controller is placed in a height of 1m (the lowest point of the electric control unit) according to the six directions of up, down, left, right, front and back, and falls freely (the ground is cement ground), twice in each direction. Reliability test method: compulsory steering test and temperature alternating sealing test shall be implemented in accordance with relevant clauses of QC/T XXXX. Overpressure test and reverse fatigue test. Under the condition that the controller receives the 0km/h vehicle speed signal, the assembly shall be tested in accordance with the methods described in the relevant clauses of QC/T XXXX. In the reverse overload test, under the condition that the controller receives the Vmax vehicle speed signal, the assembly shall be tested in accordance with the method described in the relevant clauses of QC/T XXXX. The wear test is to input the vehicle speed signal to the controller at a frequency of 0.05 Hz according to the speed change mode of 0km/h～Vmax～0km/h. Under the condition of normal operation of the electronic control valve, the assembly shall be carried out according to the method described in the relevant clauses of QC/T XXXX test. After the test, continue to test according to the free clearance of 6.1.1, the internal leakage of 6.1.2, the function test of 6.1.3 and the steering force characteristic of 6.1.5 to check whether the assembly is working properly. In the forward muddy water durability test, the speed signal is input to the controller at the speed of 0km/h～Vmax～0km/h at a frequency of 0.05Hz. Under the condition of normal operation of the electronic control valve, the assembly is in accordance with the relevant provisions of QC/T XXXX. The method is tested. After the test, continue to test according to: 1 free clearance, no-load rotating torque and external leakage, 2 internal leakage, 3 functional test, 4 steering gear stiffness and steering force characteristics to check whether the assembly is working properly.

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