A low-temperature bench test device and test method for a steering control device

Abstract

This invention provides a low-temperature bench test apparatus and test method for a steering control device, belonging to the field of steering control testing. The test apparatus comprises a test fixture, a torque measuring device, and a low-temperature-resistant bearing. The torque measuring device is connected to the steering control device. The test fixture includes a steering column mounting bracket, a front dust cover mounting bracket, a bearing mounting bracket, and a steering intermediate shaft mounting fixture. The outer ring of the low-temperature-resistant bearing is connected to the mounting hole of the bearing mounting bracket. The steering intermediate shaft mounting fixture is provided with a connecting rod and a spline. The connecting rod is connected to the inner ring of the low-temperature-resistant bearing. The inner spline at the end of the steering intermediate shaft of the steering control device is connected to the spline. The steering column of the steering control device is connected to the steering column mounting bracket, and the front dust cover of the steering control device is connected to the front dust cover mounting bracket. The test apparatus is primarily used for testing steering control devices in low-temperature environments.

Description

Technical Field

[0001] The invention belongs to the field of steering control tests, and in particular relates to a low-temperature bench test device and a test method for a steering control device. Background Art

[0002] The lubricating capacity of grease in steering systems generally decreases with decreasing temperature, a phenomenon more pronounced in winter in northern my country and European countries like Russia. With the continuous upgrading of my country's automotive industry, exports of domestically produced vehicles to European countries like Russia and Norway are also increasing. As automotive components with rotating friction pairs, steering systems typically use grease and other materials to reduce friction, thereby reducing the torque required to operate the steering wheel and making steering easier. However, there is currently no test equipment or method to verify during the development phase whether the low-temperature operating torque of the steering system meets user requirements in cold environments. Summary of the Invention

[0003] In view of this, the present invention aims to provide a low-temperature bench test device and a test method for a steering control device to meet the needs of low-temperature testing of the steering control device.

[0004] To achieve the above-mentioned objectives, the present invention adopts the following technical solutions: a low-temperature bench test device for a steering control device, the test device comprising a test fixture, a torque measuring device and a low-temperature resistant bearing, the torque measuring device being connected to the steering control device, the test fixture comprising a steering column fixing bracket, a front dust cover fixing bracket, a bearing fixing bracket and a steering intermediate shaft fixing fixture, the outer ring of the low-temperature resistant bearing being connected to the mounting hole of the bearing fixing bracket, the steering intermediate shaft fixing fixture being provided with a connecting rod and a spline, the connecting rod being connected to the inner ring of the low-temperature resistant bearing, the inner spline at the end of the steering intermediate shaft of the steering control device being connected to the spline, the steering column of the steering control device being connected to the steering column fixing bracket, and the front dust cover of the steering control device being connected to the front dust cover fixing bracket.

[0005] Furthermore, the test device is arranged in an environmental chamber.

[0006] Furthermore, the steering intermediate shaft fixing fixture is provided with a thread, a first boss is provided at the root of the thread, and the steering intermediate shaft fixing fixture is connected to the nut via the thread.

[0007] Furthermore, the outer diameter of the nut is smaller than the inner ring of the low-temperature resistant bearing.

[0008] Furthermore, a second boss is provided in the mounting hole of the bearing fixing bracket.

[0009] Furthermore, the bearing fixing bracket is provided with clamping screw holes along the radial direction of the mounting hole.

[0010] Furthermore, a steering wheel and a hand force measuring device are installed on the steering control device.

[0011] The present invention also provides a test method of a low-temperature bench test device for a steering control device, which comprises the following steps:

[0012] Step 1: Calibrate the torque and angle of the torque measuring device, adjusting the parameters until the accuracy reaches 0.01 Nm and 0.1° or better. The tightening torque between the connecting rod of the steering intermediate shaft fixing fixture and the bearing fixing bracket is no more than 10 Nm, and the tightening torque of the clamping screw hole at the upper end of the bearing fixing bracket is no more than 20 Nm.

[0013] Step 2: Rotate the low-temperature bearing to the left at 90 degrees per second to the left limit position, then rotate it to the right limit position at the same speed, and then return to the initial position. Repeat this process multiple times. The number of repetitions is the same as the test requirements. Measure the rotational torque of the low-temperature bearing under low-temperature working conditions.

[0014] Step 3: Install the steering control device in the environmental chamber according to the actual vehicle design angle and adjust it to the designed position. At the same time, fix the front dust cover according to the actual vehicle state.

[0015] Step 4: Adjust the ambient temperature to the set temperature and maintain it for 20 hours until the temperature reaches the set temperature ± 2°C;

[0016] Step 5: Rotate the torque measuring device from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed.

[0017] Step 6: Continuously monitor the ambient temperature during the rotation process. If the ambient temperature meets the set temperature ±2°C, the test result is acceptable. If it does not meet the temperature requirement, adjust the cooling efficiency of the environmental chamber and repeat step 5.

[0018] Step 7: Subtract the low-temperature bearing torque measured in step 2 from the experimental result.

[0019] Furthermore, step 3 further includes adjusting the steering control device angle and the steering control device height, and the steering control device angle and the steering control device height are adjusted in one of the following four ways:

[0020] A: The angle of the steering device is at the upper limit position, and the height of the steering device is at the upper limit position;

[0021] B: The angle of the steering device is at the upper limit position, and the height of the steering device is at the lower limit position;

[0022] C: The steering device angle is at the lower limit position, and the steering device height is at the lower limit position;

[0023] D: The steering control device angle is at the lower limit position, and the steering control device height is at the upper limit position.

[0024] Furthermore, the set temperature is -30°C, -40°C or -45°C.

[0025] Compared with the prior art, the present invention has the following beneficial effects: the present invention provides a low-temperature bench test device for a steering control device, which can verify during the development phase whether the low-temperature operating torque of the steering control device meets the user's usage requirements in cold environments. The test device in the present invention, through the design of the boss and the requirements for the tightening torque of the bearing, minimizes the impact of the bearing rolling resistance on the test results while ensuring functionality. During the test, a steering wheel and a hand force measurement device can be installed, and subjective judgments can be made while measuring objective values. During the test, the entire test device is kept in a low-temperature environment to maintain the ambient temperature, thereby improving the accuracy of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings, which constitute part of the present invention, are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an undue limitation of the present invention. In the accompanying drawings:

[0027] Figure 1 This is a schematic structural diagram of a low-temperature bench test device for a steering control device according to the present invention;

[0028] Figure 2 This is a schematic structural diagram of the steering intermediate shaft fixing fixture of the present invention;

[0029] Figure 3 This is a structural schematic diagram of the bearing fixing bracket according to the present invention;

[0030] Figure 4 This is a flow chart of a test method for a low-temperature bench test device for a steering control device according to the present invention;

[0031] Figure 5 The present invention Figure 4 Enlarged view of point A in the middle;

[0032] Figure 6 The present invention Figure 4 Enlarged view of point B in the middle;

[0033] Figure 7 The present invention Figure 4 Enlarged view of point C in the middle;

[0034] Figure 8 The present invention Figure 4 Enlarged view of point D in the middle;

[0035] Figure 9 The present invention Figure 4 Enlarged view of point E in the middle.

[0036] 1- torque measuring device, 2- steering column fixing bracket, 3- front dust cover fixing bracket, 4- bearing fixing bracket, 5- steering intermediate shaft fixing fixture, 6- low temperature resistant bearing, 7- connecting rod, 8- first boss, 9- spline, 10- clamping screw hole, 11- second boss. DETAILED DESCRIPTION

[0037] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely explain the technical solutions in the embodiments of the present invention. It should be noted that the embodiments of the present invention and the features therein can be combined with each other in the absence of conflict, and the embodiments described are only part of the embodiments of the present invention, not all of the embodiments.

[0038] See also Figure 1-9 The present embodiment describes a low-temperature bench test device for a steering control device, the test device comprising a test fixture, a torque measuring device 1 and a low-temperature resistant bearing 6, the torque measuring device 1 being connected to the steering control device, the test fixture comprising a steering column fixing bracket 2, a front dust cover fixing bracket 3, a bearing fixing bracket 4 and a steering intermediate shaft fixing fixture 5, the outer ring of the low-temperature resistant bearing 6 being connected to the mounting hole of the bearing fixing bracket 4, the steering intermediate shaft fixing fixture 5 being provided with a connecting rod 7 and a spline 9, the connecting rod 7 being connected to the inner ring of the low-temperature resistant bearing 6, the inner spline at the end of the steering intermediate shaft of the steering control device being connected to the spline 9, the steering column of the steering control device being connected to the steering column fixing bracket 2, and the front dust cover of the steering control device being connected to the front dust cover fixing bracket 3.

[0039] The test device is placed in an environmental chamber, which is set to the low-temperature environment required for the test. The steering intermediate shaft fixing fixture 5 is provided with a thread, and a first boss 8 is provided at the root of the thread. The steering intermediate shaft fixing fixture 5 is connected to the nut via a thread. The outer diameter of the nut is smaller than the inner ring of the low-temperature resistant bearing 6 to avoid pre-tightening force generated by the sliding part of the low-temperature resistant bearing 6 during the tightening of the nut, which increases the rolling resistance of the low-temperature resistant bearing 6 and affects the test results. A second boss 11 is provided in the mounting hole of the bearing fixing bracket 4 to limit the axial freedom of the low-temperature resistant bearing 6, ensuring that the low-temperature resistant bearing 6 can rotate axially while not displacing radially. Clamping screw holes 10 are provided along the radial direction of the mounting hole on the bearing fixing bracket 4. The low-temperature resistant bearing 6 is clamped and fixed in the mounting hole of the bearing fixing bracket 4 by a clamping bolt. The steering control device is equipped with a steering wheel and a hand force measurement device, which can measure objective values ​​while also making subjective judgments.

[0040] This embodiment is a test method for a low-temperature bench test device for a steering control device, which includes the following steps:

[0041] Step 1: Calibrate the torque and angle of the torque measuring device 1 and adjust the parameters until the accuracy reaches 0.01 Nm and 0.1° or above. The tightening torque of the thread between the connecting rod 7 of the steering intermediate shaft fixing fixture 5 and the bearing fixing bracket 4 is not greater than 10 Nm, and the tightening torque of the clamping screw hole at the upper end of the bearing fixing bracket 4 is not greater than 20 Nm.

[0042] Step 2: Rotate the low-temperature bearing 6 to the left at 90 degrees per second to the left limit position, then rotate it to the right limit position at the same speed, and then return to the initial position. Repeat this process multiple times. The number of repetitions is the same as the test requirements. Measure the rotational torque of the low-temperature bearing 6 under low-temperature working conditions.

[0043] Step 3: Install the steering control device in the environmental chamber according to the actual vehicle design angle and adjust it to the designed position. At the same time, fix the front dust cover according to the actual vehicle state.

[0044] Step 4: Adjust the ambient temperature to the set temperature and maintain it for 20 hours until the temperature reaches the set temperature ± 2°C;

[0045] Step 5: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0046] Step 6: Continuously monitor the ambient temperature during the rotation process. If the ambient temperature meets the set temperature ±2°C, the test result is acceptable. If it does not meet the temperature requirement, adjust the cooling efficiency of the environmental chamber and repeat step 5.

[0047] Step 7: Subtract the rotational torque of the low-temperature-resistant bearing 6 measured in step 2 from the experimental result.

[0048] The step 3 also includes adjusting the steering device angle and the steering device height, and the steering device angle and the steering device height are adjusted in one of the following four ways:

[0049] A: The angle of the steering device is at the upper limit position, and the height of the steering device is at the upper limit position;

[0050] B: The angle of the steering device is at the upper limit position, and the height of the steering device is at the lower limit position;

[0051] C: The steering device angle is at the lower limit position, and the steering device height is at the lower limit position;

[0052] D: The steering control device angle is at the lower limit position, and the steering control device height is at the upper limit position.

[0053] The set temperature in the above embodiments is -30°C, -40°C or -45°C.

[0054] The complete test method steps are as follows:

[0055] Step 1: Calibrate the torque and angle of the torque measuring device 1 and adjust the parameters until the accuracy reaches 0.01 Nm and 0.1° or above;

[0056] Step 2: The tightening torque of the threads between the connecting rod 7 of the steering intermediate shaft fixing fixture 5 and the bearing fixing bracket 4 should not exceed 10 Nm, and the tightening torque of the clamping screw hole at the upper end of the bearing fixing bracket 4 should not exceed 20 Nm;

[0057] Step 3: Rotate the low-temperature bearing 6 to the left at 90 degrees per second to the left limit position, then rotate the low-temperature bearing 6 to the right limit position at the same speed, and then return to the initial position. Repeat this process multiple times. The number of repetitions is the same as the number of test requirements. Measure the rotational torque of the low-temperature bearing 6 under low-temperature working conditions.

[0058] Step 4: Install the steering control device in the environmental chamber according to the actual vehicle design angle and adjust it to the designed position. If the steering control device angle and steering control device height are adjusted, adjust them to the designed position as well. At the same time, fix the front dust cover according to the actual vehicle state.

[0059] Step 5: Adjust the ambient temperature to -30°C and maintain it for 20 hours to determine whether the temperature has reached -30±2°C. If not, proceed to step 5. If so, proceed to step 6.

[0060] Step 6: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0061] Step 7: During step 6, the ambient temperature is continuously monitored. If it meets the temperature requirement of -30±2℃, the test result is acceptable. If it does not meet the temperature requirement, adjust the cooling efficiency of the environmental chamber and repeat step 6 until the requirements of step 7 are met.

[0062] Step 8: Adjust the steering control device angle to the upper limit position and adjust the steering control device height to the upper limit position;

[0063] Step 9: Adjust the ambient temperature to -30°C and maintain it for 20 hours to determine whether the temperature has reached -30±2°C. If not, proceed to step 9. If so, proceed to step 10.

[0064] Step 10: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0065] Step 11: During step 10, the ambient temperature is continuously monitored. If it meets the temperature requirement of -30±2℃, the test result is acceptable. If it does not meet the temperature requirement, adjust the cooling efficiency of the environmental chamber and repeat step 10 until the requirement of step 11 is met.

[0066] Step 12: Adjust the steering control device angle to the upper limit position and adjust the steering control device height to the lower limit position;

[0067] Step 13: Adjust the ambient temperature to -30°C and maintain it for 20 hours to determine whether the temperature has reached -30±2°C. If not, proceed to step 13. If so, proceed to step 14.

[0068] Step 14: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 deg / s, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0069] Step 15: During step 14, the ambient temperature is continuously monitored. If it meets the temperature requirement of -30±2°C, the test result is acceptable. If it does not meet the temperature requirement, adjust the cooling efficiency of the environmental chamber and repeat step 14 until the requirement of step 15 is met.

[0070] Step 16: Adjust the steering control device angle to the lower limit position and adjust the steering control device height to the lower limit position;

[0071] Step 17: Adjust the ambient temperature to -30°C and maintain it for 20 hours to determine whether the temperature has reached -30±2°C. If not, proceed to step 17. If so, proceed to step 18.

[0072] Step 18: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0073] Step 19: During step 18, the ambient temperature is continuously monitored. If it meets the temperature requirement of -30±2°C, the test result is acceptable. If it does not meet the temperature requirement, adjust the cooling efficiency of the environmental chamber and repeat step 18 until the requirement of step 19 is met.

[0074] Step 20: Adjust the steering control device angle to the lower limit position and adjust the steering control device height to the upper limit position;

[0075] Step 21: Adjust the ambient temperature to -30°C, maintain it for 20 hours, and then determine whether the temperature has reached -30±2°C. If not, proceed to step 21. If so, proceed to step 22.

[0076] Step 22: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0077] Step 23: During step 22, the ambient temperature is continuously monitored. If it meets the temperature requirement of -30±2°C, the test result is acceptable. If it does not meet the temperature requirement, adjust the cooling efficiency of the environmental chamber and repeat step 22 until the requirement of step 23 is met.

[0078] Step 24: Subtract the rotational torque of the low-temperature-resistant bearing 6 measured in step 2 from the experimental result;

[0079] Step 25: Adjust the ambient temperature to -40°C and maintain it for 20 hours to determine whether the temperature reaches -40±2°C. If not, repeat step 25. If so, proceed to step 26 to simulate the operating environment in some areas of Heilongjiang Province.

[0080] Step 26: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0081] Step 27: During step 26, the ambient temperature is continuously monitored. If it meets the temperature requirement of -40±2°C, the test result is acceptable. If it does not meet the temperature requirement, the cooling efficiency of the environmental chamber is adjusted and step 26 is repeated until the requirement of step 27 is met.

[0082] Step 28: Adjust the steering control device angle to the upper limit position and adjust the steering control device height to the upper limit position;

[0083] Step 29: Adjust the ambient temperature to -40°C, maintain it for 20 hours, and then determine whether the temperature has reached -40±2°C. If not, proceed to step 29. If so, proceed to step 30.

[0084] Step 30: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 deg / s, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0085] Step 31: During step 30, the ambient temperature is continuously monitored. If it meets the temperature requirement of -40±2°C, the test result is acceptable. If it does not meet the temperature requirement, the cooling efficiency of the environmental chamber is adjusted and step 30 is repeated until the requirement of step 31 is met.

[0086] Step 32: Adjust the steering control device angle to the upper limit position and adjust the steering control device height to the lower limit position;

[0087] Step 33: Adjust the ambient temperature to -40℃, maintain it for 20 hours and determine whether the temperature has reached -40±2℃. If not, continue with step 33. If so, proceed to step 34.

[0088] Step 34: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0089] Step 35: During step 34, the ambient temperature is continuously monitored. If it meets the temperature requirement of -40±2°C, the test result is acceptable. If it does not meet the temperature requirement, the cooling efficiency of the environmental chamber is adjusted and step 34 is repeated until the requirement of step 35 is met.

[0090] Step 36: Adjust the steering control device angle to the lower limit position, and adjust the steering control device height to the lower limit position;

[0091] Step 37: Adjust the ambient temperature to -40°C and maintain it for 20 hours to determine whether the temperature has reached -40±2°C. If not, proceed to step 37. If so, proceed to step 38.

[0092] Step 38: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0093] Step 39: During step 38, the ambient temperature is continuously monitored. If it meets the temperature requirement of -40±2°C, the test result is acceptable. If it does not meet the temperature requirement, the cooling efficiency of the environmental chamber is adjusted and step 38 is repeated until the requirement of step 39 is met.

[0094] Step 40: Adjust the angle of the steering control device to the lower limit position and adjust the height of the steering control device to the upper limit position;

[0095] Step 41: Adjust the ambient temperature to -40°C, maintain it for 20 hours, and then determine whether the temperature has reached -40±2°C. If not, proceed to step 41; if so, proceed to step 42.

[0096] Step 42: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0097] Step 43: During step 42, the ambient temperature is continuously monitored. If the ambient temperature meets -40±2°C, the test result is acceptable. If the ambient temperature does not meet the temperature requirement, the cooling efficiency of the environmental chamber is adjusted and step 42 is repeated until the requirement of step 43 is met.

[0098] Step 44: Subtract the rotational torque of the low-temperature resistant bearing 6 measured in step 2 from the experimental result;

[0099] Step 45: Adjust the ambient temperature to -45°C and maintain it for 20 hours. After that, determine whether the temperature has reached -45±2°C. If not, repeat step 45. If it has, proceed to step 46. This is used to simulate overseas vehicle usage scenarios in Russia, Norway, and other countries.

[0100] Step 46: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0101] Step 47: During step 46, the ambient temperature is continuously monitored. If the ambient temperature meets -45±2°C, the test result is acceptable. If the ambient temperature does not meet the temperature requirement, the cooling efficiency of the environmental chamber is adjusted and step 46 is repeated until the requirement of step 47 is met.

[0102] Step 48: Adjust the steering control device angle to the upper limit position, and adjust the steering control device height to the upper limit position;

[0103] Step 49: Adjust the ambient temperature to -45°C, maintain it for 20 hours, and then determine whether the temperature has reached -45±2°C. If not, proceed to step 49. If so, proceed to step 50.

[0104] Step 50: rotating the torque measuring device 1 from the middle position to one extreme position at a speed of 90 deg / s, then rotating from one extreme position to the other extreme position at the same speed, and then returning to the middle position at the same speed;

[0105] Step 51: During step 50, the ambient temperature is continuously monitored. If the ambient temperature meets -45±2°C, the test result is acceptable. If the ambient temperature does not meet the temperature requirement, the cooling efficiency of the environmental chamber is adjusted and step 50 is repeated until the requirement of step 51 is met.

[0106] Step 52: Adjust the angle of the steering control device to the upper limit position and adjust the height of the steering control device to the lower limit position;

[0107] Step 53: Adjust the ambient temperature to -45°C, maintain it for 20 hours, and then determine whether the temperature has reached -45±2°C. If not, proceed to step 53; if so, proceed to step 54.

[0108] Step 54: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed.

[0109] Step 55: During step 54, the ambient temperature is continuously monitored. If the ambient temperature meets -45±2°C, the test result is acceptable. If the ambient temperature does not meet the temperature requirement, the cooling efficiency of the environmental chamber is adjusted and step 54 is repeated until the requirement of step 55 is met.

[0110] Step 56: Adjust the steering control device angle to the lower limit position, and adjust the steering control device height to the lower limit position;

[0111] Step 57: Adjust the ambient temperature to -45°C, maintain it for 20 hours, and then determine whether the temperature has reached -45±2°C. If not, proceed to step 57; if so, proceed to step 58.

[0112] Step 58: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed;

[0113] Step 59: During step 58, the ambient temperature is continuously monitored. If the ambient temperature meets -45±2°C, the test result is acceptable. If the ambient temperature does not meet the temperature requirement, the cooling efficiency of the environmental chamber is adjusted and step 58 is repeated until the requirement of step 59 is met.

[0114] Step 60: Adjust the angle of the steering control device to the lower limit position and adjust the height of the steering control device to the upper limit position;

[0115] Step 61: Adjust the ambient temperature to -45°C, maintain it for 20 hours, and then determine whether the temperature has reached -45±2°C. If not, proceed to step 61; if so, proceed to step 62.

[0116] Step 62: Rotate the torque measuring device 1 from the middle position to one extreme position at a speed of 90 degrees per second, then rotate from one extreme position to the other extreme position at the same speed, and then return to the middle position at the same speed.

[0117] Step 63: During step 62, the ambient temperature is continuously monitored. If it meets the temperature requirement of -45±2℃, the test result is acceptable. If it does not meet the temperature requirement, adjust the cooling efficiency of the environmental chamber and repeat step 62 until the requirements of step 63 are met.

[0118] Step 64: Subtract the rotational torque of the low-temperature-resistant bearing 6 measured in step 2 from the experimental result.

[0119] The embodiments of the present invention disclosed above are intended only to illustrate the present invention. The embodiments do not describe all details in detail, nor do they limit the present invention to the specific embodiments described. Numerous modifications and variations are possible based on the contents of this specification. These embodiments are selected and described in detail in this specification to better explain the principles and practical applications of the present invention, thereby enabling those skilled in the art to better understand and utilize the present invention.

Claims

1. A test method for a steering control device low-temperature bench test device, characterized in that: The test device comprises a test fixture, a torque measuring device (1) and a low-temperature resistant bearing (6), wherein the torque measuring device (1) is connected to a steering control device, and the test fixture comprises a steering column fixing bracket (2), a front dust cover fixing bracket (3), a bearing fixing bracket (4) and a steering intermediate shaft fixing fixture (5), wherein the outer ring of the low-temperature resistant bearing (6) is connected to the mounting hole of the bearing fixing bracket (4), and the steering intermediate shaft fixing fixture (5) is provided with a connecting rod (7) and a spline (9), wherein the connecting rod (7) is connected to the inner ring of the low-temperature resistant bearing (6), the inner spline of the steering intermediate shaft end of the steering control device is connected to the spline (9), the steering column of the steering control device is connected to the steering column fixing bracket (2), and the front dust cover of the steering control device is connected to the front dust cover fixing bracket (3); The test method includes the following steps: Step 1: Calibrate the torque and angle of the torque measuring device (1), and adjust the parameters until the accuracy reaches 0.01 Nm and 0.1° or above, the thread tightening torque between the connecting rod (7) of the steering intermediate shaft fixing fixture (5) and the bearing fixing bracket (4) is not greater than 10 Nm, and the tightening torque of the clamping screw hole at the upper end of the bearing fixing bracket (4) is not greater than 20 Nm; Step 2: Rotate the low-temperature resistant bearing (6) to the left at 90 degrees per second to the left limit position, then rotate the low-temperature resistant bearing (6) to the right limit position at the same speed, and then return to the initial position. Repeat this process multiple times, the number of repetitions being the same as the number of test requirements, and measure the rotational torque of the low-temperature resistant bearing (6) under low-temperature working conditions. Step 3: Install the steering control device in the environmental chamber according to the actual vehicle design angle and adjust it to the designed position. At the same time, fix the front dust cover according to the actual vehicle state. Step 4: Adjust the ambient temperature to the set temperature and maintain it for 20 hours until the temperature reaches the set temperature ± 2°C; Step 5: rotating the torque measuring device (1) from the middle position to one extreme position at a speed of 90 deg / s, then rotating from one extreme position to the other extreme position at the same speed, and then returning to the middle position at the same speed; Step 6: Continuously monitor the ambient temperature during the rotation process. If the ambient temperature meets the set temperature ±2°C, the test result is acceptable. If it does not meet the temperature requirement, adjust the cooling efficiency of the environmental chamber and repeat step 5. Step 7: Subtract the rotational torque of the low-temperature resistant bearing (6) measured in step 2 from the experimental result.

2. The test method of a low-temperature bench test device for a steering control device according to claim 1, characterized in that: The test device is arranged in an environmental chamber.

3. The test method of a low-temperature bench test device for a steering control device according to claim 1, characterized in that: The steering intermediate shaft fixing fixture (5) is provided with a thread, a first boss (8) is provided at the root of the thread, and the steering intermediate shaft fixing fixture (5) is connected to a nut via the thread.

4. The test method of a low-temperature bench test device for a steering control device according to claim 3, characterized in that: The outer diameter of the nut is smaller than the inner ring of the low-temperature resistant bearing (6).

5. The test method of a low-temperature bench test device for a steering control device according to claim 1, characterized in that: A second boss (11) is provided in the mounting hole of the bearing fixing bracket (4).

6. The test method of a low-temperature bench test device for a steering control device according to claim 1, characterized in that: The bearing fixing bracket (4) is provided with a clamping screw hole (10) along the radial direction of the mounting hole.

7. The test method of a low-temperature bench test device for a steering control device according to claim 1, characterized in that: A steering wheel and a hand force measuring device are installed on the steering control device.

8. The test method of a low-temperature bench test device for a steering control device according to claim 1, characterized in that: The step 3 also includes adjusting the steering device angle and the steering device height, and the steering device angle and the steering device height are adjusted in one of the following four ways: A: The angle of the steering device is at the upper limit position, and the height of the steering device is at the upper limit position; B: The angle of the steering device is at the upper limit position, and the height of the steering device is at the lower limit position; C: The steering device angle is at the lower limit position, and the steering device height is at the lower limit position; D: The steering control device angle is at the lower limit position, and the steering control device height is at the upper limit position.

9. The test method of a low-temperature bench test device for a steering control device according to claim 1 or 8, characterized in that: The set temperature is -30°C, -40°C or -45°C.

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