Electric power steering system and steering wheel rotating angle optimizing and debugging equipment and method

Abstract

The invention relates to the field of electric power steering detection, and discloses an electric power steering system and steering wheel rotation angle optimization debugging equipment and method.The debugging device comprises a simulation driving part, a simulation output part and a fixing base, and the simulation driving part is used for being connected with the input end of the electric power steering system; the analog output part is used for being connected with the output end of the electric power steering system; the fixing seat is used for fixing the electric power steering system, and a power-assisted motor of the electric power steering system is connected with the controller; the controller controls the output torque by controlling the current of the simulation drive part and the power-assisted motor, and the simulation output part tests the electric power-assisted steering system according to the preset resistance. The debugging equipment can be matched with different function requirements for debugging, and is wide in adaptation and accurate in scene simulation.

Description

Technical Field

[0001] The present invention relates to the field of electric power steering detection, and in particular to an electric power steering system and steering wheel angle optimization and debugging equipment and method. Background Art

[0002] In the rack and pinion electric power steering (P / DP-EPS for short), there is a worm gear reduction structure. In order to make it mesh better, the worm gear reduction mechanism needs to be run-in during the P / DP-EPS assembly. At present, the commonly used P / DP-EPS worm gear reduction mechanism running-in method is through manual running-in. First, the worm gear reduction mechanism is fixed, and the steering wheel is installed at the input end. The steering wheel is turned to run-in the worm gear. However, in this process, because there is no load, the running-in effect is limited. If the parts are loaded by the power-assisted lifting motor, the worker's operation will be very laborious, and the processing efficiency will be seriously reduced.

[0003] Chinese patent CN117620324A provides a worm gear running-in device, which drives the steering wheel to run-in through a motor drive; however, the structure is very limited and does not involve debugging, technical calibration and other aspects; this solution provides a debugging device and method, which can realize calibration debugging, running-in and durability testing of the same product in different usage scenarios. Summary of the invention

[0004] The present invention aims at the shortcomings of the prior art and provides an electric power steering system and steering wheel angle optimization and debugging equipment and method.

[0005] In order to solve the above technical problems, the present invention is solved by the following technical solutions.

[0006] An electric power steering system comprises a housing, a power-assisting motor and a power-assisting mechanism arranged in the housing, an input end for connecting to a steering wheel end, and an output end for transmitting to a wheel system.

[0007] Steering wheel angle optimization and debugging equipment, used for debugging the above-mentioned electric power steering system, including a machine, a debugging device and a controller;

[0008] The debugging device and controller are installed on the machine platform, which provides a basis for equipment installation and fixture installation;

[0009] The debugging device includes an analog drive part, an analog output part and a fixing seat, wherein the analog drive part is used to be connected to the input end of the electric power steering system, and the analog output part is used to be connected to the output end of the electric power steering system; the fixing seat is used to fix the electric power steering system, and the power motor of the electric power steering system is connected to the controller;

[0010] The controller controls the output torque by controlling the analog drive part and the current of the power-assisted motor. The analog output part tests the electric power-assisted steering system according to a preset resistance.

[0011] Preferably, the simulation driving part includes a simulation motor and a connecting transmission mechanism, the output end of the simulation motor is connected to the transmission mechanism through a coupling, and the output end of the transmission mechanism is connected to the input end of the electric power steering system; the transmission mechanism is a telescopic universal joint mechanism; the rotation of the simulation motor drives the driving part of the electric power steering system to rotate forward or reverse through the transmission mechanism.

[0012] Preferably, the telescopic universal joint mechanism includes an upper universal joint part one and a lower universal joint part two, the upper universal joint part one includes a joint head one and a lower sleeve part, the lower universal joint part two includes a joint head two and a lower pin part, the sleeve part and the pin part are clearance-matched and matched through a spline structure.

[0013] Preferably, the simulation output part includes a resistance simulation device, which is connected to a connecting arm, which is connected to an output end of an electric power steering system. The electric power steering system drives the connecting arm to swing, and the connecting arm overcomes the resistance of the resistance simulation device while swinging.

[0014] Preferably, the resistance simulation device includes an unpowered oil cylinder, an oil storage tank connected to the unpowered oil cylinder, and a regulating valve for adjusting the diameter of the pipeline between the oil cylinder and the oil storage tank. Both sides of the unpowered oil cylinder piston are connected to the oil storage tank, and the resistance of the resistance simulation device is adjusted by adjusting the diameter.

[0015] Preferably, it also includes an adjusting screw, and the resistance simulation device includes a connecting head, one end of the connecting head is connected to the piston rod end of the unpowered oil cylinder, and the other end is fixedly connected to the adjusting screw; the adjusting screw is fixed on the frame on the machine platform, and the position of the adjusting screw can be adjusted by adjusting the position of the nut; the connecting head is connected to the connecting arm through a pin shaft, and the connecting arm can rotate around the pin shaft.

[0016] The steering wheel angle optimization and debugging method includes the above-mentioned steering wheel angle optimization and debugging device, and is divided into the following steps:

[0017] Step 1: The electric power steering system is fixedly mounted on a fixed seat, the analog drive part is connected to the input end of the electric power steering system to simulate the steering wheel function, the analog output part is connected to the output end of the electric power steering system to simulate the external resistance during steering; the controller is connected to the power motor of the electric power steering system;

[0018] Step 2: according to the preset working scenario of the electric power steering system, the output parameters of the simulation motor, the output parameters of the power motor, and the parameters of the simulation output part are set; in accordance with the actual steering requirements, power requirements, and resistance requirements of the steering wheel;

[0019] Step 3: Start the equipment, the simulation motor drives the input end of the electric power steering system to move, the power motor performs power steering through the power mechanism, and the output end of the electric power steering system transmits the output torque to the simulation output part through the swing arm;

[0020] Step 4: Observe whether the movement of the swing arm meets the requirements during the debugging process. If not, adjust the parameters in step 2.

[0021] Step 5: After the adjustment is completed, control the equipment to stop according to the preset debugging times or time.

[0022] Compared with the prior art, this solution has the following advantages: by setting the input torque and the assist torque, the adaptability range of the electric power steering system during debugging can be wider and can adapt to the debugging needs of different vehicles. At the same time, the output end can simulate the load of the vehicle and can be adjusted as needed. The input and output ends can be set, so that the entire device is more in line with actual working conditions during product debugging and simulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the overall structure of the device.

[0024] Figure 2 It is the overall structural diagram of the debugging device.

[0025] Figure 3 It is a schematic diagram of the overall structure of the debugging device.

[0026] The technical names of the accompanying drawings are: 1-housing, 2-power-assisting motor, 3-input end, 5-output end, 6-machine, 7-debugging device, 9-electric power steering system, 10-simulation drive part, 11-simulation output part, 12-simulation motor, 13-coupling, 14-telescopic universal joint, 15-joint head 1, 16-sleeve part, 17-joint head 2, 18-pin part, 19-resistance simulation device, 20-unpowered cylinder, 21-connecting head, 22-adjusting screw, 23-nut, 24-swing arm. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0028] Example 1

[0029] An electric power steering system 9 includes a housing 1, a power steering motor 2 and a power steering mechanism arranged in the housing 1, an input terminal 3 for connecting to a steering wheel end, and an output terminal 5 for transmitting to a wheel system.

[0030] The steering assist is generally performed through an internally designed worm gear mechanism, and at the same time, there is a power assist motor 2 at the power assist end to output the power assist torque.

[0031] Example 2

[0032] The steering wheel angle optimization and debugging equipment is used to debug the above-mentioned electric power steering system 9, and the equipment includes a machine 6, a debugging device 7 and a controller; the control is used to send signals, signal interaction, and output electrical energy for the entire system; the controller pre-stores debugging data of different products, including input torque, power torque and load torque of different products.

[0033] The debugging device 7 and the controller are installed on the machine platform 6, and the machine platform 6 provides a basis for the installation of equipment and fixtures;

[0034] The debugging device 7 includes an analog drive part 10, an analog output part 11 and a fixing seat, wherein the analog drive part 10 is used to be connected to the input end 3 of the electric power steering system 9, and the analog output part 11 is used to be connected to the output end 5 of the electric power steering system 9; the fixing seat is used to fix the electric power steering system 9, and the power-assisting motor 2 of the electric power steering system 9 is connected to the controller; wherein the analog drive part 10 is used to simulate the output torque of the steering wheel, and the analog output part 11 is used to simulate the torque output and load torque of the electric power steering system 9; wherein the magnitude of the power-assisting torque is controlled according to the magnitude of the current controlling the power-assisting motor 2.

[0035] The controller controls the output torque by controlling the analog driving part 10 and the current of the power-assisted motor 2 , and the analog output part 11 tests the electric power-assisted steering system 9 according to a preset resistance.

[0036] The simulation driving part 10 includes a simulation motor 12 and a connecting transmission mechanism. The output end 5 of the simulation motor 12 is connected to the transmission mechanism through a coupling 13, and the output end 5 of the transmission mechanism is connected to the input end 3 of the electric power steering system 9; the transmission mechanism is a telescopic universal joint mechanism; the rotation of the simulation motor 12 drives the driving part of the electric power steering system 9 to rotate forward or reverse through the transmission mechanism. The telescopic universal joint mechanism includes an upper universal joint part 1 and a lower universal joint part 2, the upper universal joint part 1 includes a joint head 15 and a lower sleeve part 16, the lower universal joint part 2 includes a joint head 2 17 and a lower pin part 18, the sleeve part 16 and the pin part 18 are gap-matched and matched through a spline structure. The design of this transmission mechanism can not only imitate the actual working condition of the steering wheel, but also prevent jamming, and can adapt to electric power steering systems 9 of different sizes without the need to replace parts.

[0037] The simulated output part 11 includes a resistance simulation device 19, wherein the resistance simulation device 19 is equivalent to the load when the vehicle is turning. In this embodiment, the resistance simulation device 19 is a pressure-free cylinder. The resistance simulation device 19 is connected to a connecting arm, and the connecting arm is connected to the output end 5 of the electric power steering system 9. The electric power steering system 9 drives the connecting arm to swing, and the connecting arm overcomes the resistance of the resistance simulation device 19 while swinging.

[0038] The resistance simulation device 19 includes a non-powered oil cylinder 20, an oil storage tank connected to the non-powered oil cylinder 20, and a regulating valve for adjusting the diameter of the pipeline between the oil cylinder and the oil storage tank. Both sides of the piston of the non-powered oil cylinder 20 are connected to the oil storage tank, and the resistance of the resistance simulation device 19 is adjusted by adjusting the diameter. When the swing arm 24 pushes the piston of the oil cylinder, the hydraulic oil will overflow into the oil storage tank, and the chamber on the other side of the piston will absorb the hydraulic oil. There is resistance in this process, and the resistance of the piston movement can be adjusted by controlling the diameter of the oil circuit. Because under the same pressure, the smaller the aperture, the greater the resistance of the oil circuit.

[0039] In order to adapt to different products, it is sometimes necessary to adjust the initial position of the swing arm 24, so this solution also includes an adjusting screw 22. The resistance simulation device 19 includes a connector 21, one end of the connector 21 is connected to the piston rod end of the non-powered oil cylinder 20, and the other end is fixedly connected to the adjusting screw 22; the adjusting screw 22 is fixed to the frame on the machine table 6, and the position of the adjusting screw 22 can be adjusted by adjusting the position of the nut 23; the connector 21 is connected to the connecting arm through a pin, and the connecting arm can rotate around the pin. A fixing hole is provided on the frame, and the adjusting screw 22 is inserted into the fixing hole. Fixing nuts 23 are provided on both sides of the hole to fix the adjusting screw 22, so as to determine the position of the screw. When adjustment is required, loosen the fixing nut 23 and then pull the screw to adjust the initial position of the piston rod. After adjusting to the required position, retighten the nut 23 to lock the adjusting screw.

[0040] Example 3

[0041] The steering wheel angle optimization and debugging method includes the above-mentioned steering wheel angle optimization and debugging device, and is divided into the following steps:

[0042] Step 1: The electric power steering system 9 is fixedly mounted on a fixed seat, the analog driving part 10 is connected to the input terminal 3 of the electric power steering system 9 to simulate the steering wheel function, and the analog output part 11 is connected to the output terminal 5 of the electric power steering system 9 to simulate the external resistance during steering; the controller is connected to the power motor 2 of the electric power steering system 9;

[0043] Step 2: setting the output parameters of the simulation motor 12, the output parameters of the power-assisted motor 2, and the parameters of the simulation output part 11 according to the preset working scene of the electric power-assisted steering system 9; meeting the requirements of actual steering wheel steering, power assistance, and resistance;

[0044] Step 3, start the device, the simulation motor 12 drives the input end 3 of the electric power steering system 9 to move, the power motor 2 performs power steering through the power mechanism, and the output end 5 of the electric power steering system 9 transmits the output torque to the simulation output part 11 through the swing arm 24;

[0045] Step 4: Observe whether the movement of the swing arm 24 during the debugging process meets the requirements. If not, adjust the parameters in step 2;

[0046] Step 5: After the adjustment is completed, control the equipment to stop according to the preset debugging times or time.

[0047] For example, in the actual process, debugging and running-in are required. Because the hardware structure of a single product may be adapted to different models, it is difficult to ensure that the running-in product meets the actual needs by choosing the same standard running-in method. This solution can meet the actual working conditions of each product by setting the simulation motor 12, the power motor 2 and the resistance device, and the parameters can be adjusted during the running-in process, so that the calibration parameters of the product are more in line with the actual needs.

Claims

1. An electric power steering system, characterized in that: It comprises a housing (1), a power-assisting motor (2) and a power-assisting mechanism arranged in the housing (1), and also comprises an input end (3) for connecting to a steering wheel end and an output end (5) for transmitting to a wheel system.

2. Steering wheel angle optimization and debugging equipment, characterized by: A device for debugging an electric power steering system (9) as claimed in claim 1, comprising a machine (6), a debugging device (7) and a controller; The debugging device (7) and the controller are installed on the machine platform (6), and the machine platform (6) provides a basis for the installation of the equipment and the fixture; The debugging device (7) comprises an analog driving part (10), an analog output part (11) and a fixing seat, wherein the analog driving part (10) is used to be connected to an input end (3) of an electric power steering system (9), and the analog output part (11) is used to be connected to an output end (5) of the electric power steering system (9); the fixing seat is used to fix the electric power steering system (9), and the power assist motor (2) of the electric power steering system (9) is connected to a controller; The controller controls the output torque by controlling the current magnitude of the analog driving part (10) and the power-assisted motor (2), and the analog output part (11) tests the electric power-assisted steering system (9) according to a preset resistance.

3. The steering wheel angle optimization and debugging equipment according to claim 2, characterized in that: The simulation driving part (10) comprises a simulation motor (12) and a connecting transmission mechanism, wherein an output end (5) of the simulation motor (12) is connected to the transmission mechanism via a coupling (13), and the output end (5) of the transmission mechanism is connected to an input end (3) of an electric power steering system (9); the transmission mechanism is a telescopic universal joint mechanism; the rotation of the simulation motor (12) drives the driving part of the electric power steering system (9) to rotate forward or reverse through the transmission mechanism.

4. The steering wheel angle optimization and debugging equipment according to claim 3 is characterized in that: The telescopic universal joint mechanism comprises an upper universal joint part 1 and a lower universal joint part 2, wherein the upper universal joint part 1 comprises a joint head 1 (15) and a lower sleeve part (16), and the lower universal joint part 2 comprises a joint head 2 (17) and a lower pin part (18), and the sleeve part (16) and the pin part (18) are clearance matched and matched through a spline structure.

5. The steering wheel angle optimization and debugging equipment according to claim 2, characterized in that: The simulation output part (11) comprises a resistance simulation device (19), the resistance simulation device (19) is connected to a connecting arm, the connecting arm is connected to an output end (5) of an electric power steering system (9), the electric power steering system (9) drives the connecting arm to swing, and the connecting arm swings while overcoming the resistance of the resistance simulation device (19).

6. The steering wheel angle optimization and debugging equipment according to claim 5, characterized in that: The resistance simulation device (19) comprises an unpowered oil cylinder (20), an oil storage tank connected to the unpowered oil cylinder (20), and a regulating valve for adjusting the diameter of the pipeline between the oil cylinder and the oil storage tank. Both sides of the piston of the unpowered oil cylinder (20) are connected to the oil storage tank, and the resistance of the resistance simulation device (19) is adjusted by adjusting the diameter.

7. The steering wheel angle optimization and debugging equipment according to claim 6, characterized in that: The device also includes an adjusting screw (22). The resistance simulation device (19) includes a connecting head (21), one end of which is connected to the piston rod end of the non-powered oil cylinder (20), and the other end of which is fixedly connected to the adjusting screw (22); the adjusting screw (22) is fixed to a frame on the machine platform (6), and the position of the adjusting screw (22) can be adjusted by adjusting the position of a nut (23); the connecting head (21) is connected to a connecting arm via a pin shaft, and the connecting arm can rotate around the pin shaft.

8. A steering wheel angle optimization debugging method, characterized in that: The device for optimizing and debugging a steering wheel angle according to any one of claims 2 to 7 is divided into the following steps: Step 1: The electric power steering system (9) is fixedly mounted on a fixed seat, the simulation driving part (10) is connected to the input end (3) of the electric power steering system (9) to simulate the steering wheel function, and the simulation output part (11) is connected to the output end (5) of the electric power steering system (9) to simulate the external resistance during steering; the controller is connected to the power motor (2) of the electric power steering system (9); Step 2: setting the output parameters of the simulation motor (12), the output parameters of the power-assisted motor (2), and the parameters of the simulation output part (11) according to the preset working scene of the electric power-assisted steering system (9); meeting the requirements of actual steering wheel steering, power assistance, and resistance; Step 3, starting the device, the simulation motor (12) drives the input end (3) of the electric power steering system (9) to move, the power-assisted motor (2) performs power steering through the power-assisted mechanism, and the output end (5) of the electric power steering system (9) transmits the output torque to the simulation output part (11) through the swing arm (24); Step 4: Observe whether the movement of the swing arm (24) during the debugging process meets the requirements. If not, adjust the parameters in step 2; Step 5: After the adjustment is completed, control the equipment to stop according to the preset debugging times or time.

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