EPS torsion bar fatigue constant value loading control system and method

Abstract

The invention provides an EPS torsion bar fatigue constant value loading control system and method, and belongs to the technical field of EPS torsion bar fatigue testing. During testing, a tester mechanically connects the motor shaft of the servo motor with the torsion bar to be tested, and electrically connects the constant value loading controller, the driver and the servo motor. After the constant value loading controller and the driver are powered on, the constant value loading controller outputs an excitation signal to the driver to control the driver to be started. A tester sets fatigue test parameters to the constant value loading controller through the input module, and the constant value loading controller loads the set fatigue test parameters to the driver. And the driver controls the servo motor to work according to the fatigue test parameters, and the servo motor performs fatigue test on the tested torsion bar. The torsion bar fatigue testing device provides constant and accurate loading force for the fatigue test of the torsion bar, and improves the accuracy and credibility of the test.

Description

Technical Field

[0001] This invention belongs to the field of EPS torsion bar fatigue testing technology. Specifically, this invention relates to an EPS torsion bar fatigue constant value loading control system and method. Background Technology

[0002] As a key component in EPS systems, the fatigue performance of torsion bars directly affects the reliability and safety of the entire system. To evaluate the fatigue life of torsion bars, constant loading tests are required. This involves applying a constant torsional force or a constant rotational speed under a certain load condition and observing fatigue phenomena such as deformation and crack propagation.

[0003] Chinese Patent 105352743A discloses a method for testing the fatigue performance of a swing arm, comprising the following steps: Step a: Install the connecting shaft and ball pin onto the swing arm mounting base and ball pin mounting base respectively; Step b: Install the swing arm mounting base and ball pin mounting base onto the test bench; Step c: Connect the front end of the test torsion bar to the connecting bracket and the rear end to the spline sleeve, and install the spline sleeve onto the torsion bar fatigue testing machine; Step d: Install the swing arm under test onto the test bench, connect the connecting bracket to the swing arm under test, and press the swing arm under test onto the ball pin; Step e: Apply a cyclic load to the test torsion bar through the fatigue testing machine, and then the test torsion bar transfers the cyclic load to the swing arm under test; Step f: After a certain number of cycles, if no cracks appear in the swing arm, the fatigue performance is qualified; if cracks appear, it is unqualified.

[0004] Existing technologies cannot provide a constant and precise loading force for fatigue testing of torsion bars, which affects the accuracy and reliability of the tests. Summary of the Invention

[0005] The present invention aims to provide a fatigue constant loading control system and method for EPS torsion bars, so as to achieve the technical objective of accurately controlling the loading force when performing fatigue testing on EPS torsion bars.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] This invention provides an EPS torsion bar fatigue constant value loading control system, including an input module, a control module, a drive module, an execution module, and a test mode switching module. The output terminal of the input module is connected to the input terminal of the control module, the output terminal of the control module is connected to the input terminal of the drive module, the output terminal of the drive module is connected to the input terminal of the execution module, the execution module is connected to the torsion bar under test, and the output terminal of the test mode switching module is connected to the input terminal of the control module.

[0008] The input module inputs the modified values ​​of the fatigue test parameters to the control module, the control module inputs the loading signal of the fatigue test parameters to the drive module, the drive module outputs the drive signal to the execution module, and the test mode switching module outputs the test mode switching signal to the control module.

[0009] The input module includes a knob and a keyboard.

[0010] The control module employs a constant value loading controller, and the output of the constant value loading controller is connected to a display screen.

[0011] The drive module uses a driver; the execution module uses a servo motor; and the test mode switching module uses a toggle switch.

[0012] This invention provides a method for controlling the fatigue constant value loading of an EPS torsion bar system:

[0013] Step 1: The tester mechanically connects the motor shaft of the servo motor to the torsion bar under test, and electrically connects the constant value load controller, driver and servo motor.

[0014] Step 2: After the constant value load controller and driver are powered on, the constant value load controller outputs an excitation signal to the driver to control the driver to start.

[0015] Step 3: The tester sets the fatigue test parameters to the constant value loading controller through the input module, and the constant value loading controller loads the set fatigue test parameters to the driver.

[0016] Step 4: The driver controls the servo motor to work according to the fatigue test parameters, and the servo motor performs fatigue test on the torsion bar under test.

[0017] In step three, the tester sets the fatigue test parameters to the constant value loading controller via the keyboard, or switches the input device to a knob via the keyboard to set the fatigue test parameters to the constant value loading controller.

[0018] In step three, the constant value loading controller detects the actual drive signal output by the current driver and compares it with the set fatigue test parameters, and adjusts the drive signal output by the driver through feedback control.

[0019] The tester inputs a mode switching signal to the constant value loading controller by switching the input mode via a toggle switch. The constant value loading controller then drives a servo motor to perform constant torque or constant speed tests on the torsion bar under test via a driver.

[0020] The display screen shows the current fatigue test parameters, and the current input device is displayed after switching between keyboard and knob input in the input module.

[0021] The technical effects of this invention are as follows:

[0022] (1) This invention employs advanced control technology to achieve precise constant loading in torsion bar fatigue tests. Through a closed-loop control system, the loading force can be monitored and adjusted in real time, ensuring stability and accuracy during the test process.

[0023] (2) The design of this invention is miniaturized, rationalized, and easy to maintain and care for. The modular design allows for easy disassembly and replacement of each component, reducing maintenance costs and time.

[0024] (3) The present invention has low design cost and simple operation. The present invention is developed using low-cost process chips. The control method is also familiar to personnel, which can be selected by buttons and knobs. At the same time, the real-time status is displayed on the screen, making it easy for test personnel to get started.

[0025] (4) This invention significantly improves the ease of setting fatigue test parameters by providing an input module that supports both keyboard and knob input methods and can be freely switched via the B key on the keyboard. The two input methods are adapted to the operating habits of different testers, greatly improving the efficiency of parameter setting and shortening the test preparation time.

[0026] (5) This invention achieves real-time visual monitoring of the testing process through an OLED display screen. The display screen can show the test mode, servo motor rotation direction, current input device, excitation start status, speed and torque parameters in real time, enabling testers to intuitively grasp the test status, facilitate timely detection and adjustment of parameter abnormalities, and improve the controllability of the testing process.

[0027] (6) By setting up a linkage mechanism between the buzzer and the driver fault feedback, the present invention significantly improves the safety and testing reliability of the system. Attached Figure Description

[0028] This manual includes the following figures, which illustrate the following:

[0029] Figure 1 This is a logical structure block diagram of an EPS torsion bar fatigue constant value loading control system and method according to the present invention;

[0030] Figure 2 This is a schematic diagram of an EPS torsion bar fatigue constant value loading control system and method according to the present invention;

[0031] Figure 3 This is a circuit diagram of an EPS torsion bar fatigue constant value loading control system and method according to the present invention;

[0032] Figure 4 This is a display screen state diagram of an EPS torsion bar fatigue constant value loading control system and method according to the present invention.

[0033] Figure 1 The modules are labeled as follows: 1. Input module; 2. Control module; 3. Driver module; 4. Execution module; 5. Test mode switching module. Detailed Implementation

[0034] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0035] This invention provides an EPS torsion bar fatigue constant value loading control system, including an input module, a control module, a drive module, an execution module, and a test mode switching module. The output terminal of the input module is connected to the input terminal of the control module, the output terminal of the control module is connected to the input terminal of the drive module, the output terminal of the drive module is connected to the input terminal of the execution module, the execution module is connected to the torsion bar under test, and the output terminal of the test mode switching module is connected to the input terminal of the control module.

[0036] The input module inputs the modified values ​​of the fatigue test parameters to the control module, the control module inputs the load signal of the fatigue test parameters to the drive module, the drive module outputs the drive signal to the execution module, and the test mode switching module outputs the test mode switching signal to the control module.

[0037] The input module includes a knob and a keyboard. The control module uses a constant-value load controller, the output of which is connected to a display screen. The drive module uses a driver; the execution module uses a servo motor; and the test mode switching module uses a toggle switch.

[0038] This invention provides a method for controlling the fatigue constant value loading of an EPS torsion bar system:

[0039] Step 1: The tester mechanically connects the motor shaft of the servo motor to the torsion bar under test, and electrically connects the constant value load controller, driver and servo motor.

[0040] Step 2: After the constant value load controller and driver are powered on, the constant value load controller outputs an excitation signal to the driver to control the driver to start.

[0041] Step 3: The tester sets the fatigue test parameters to the constant value loading controller through the input module, and the constant value loading controller loads the set fatigue test parameters to the driver.

[0042] Step 4: The driver controls the servo motor to work according to the fatigue test parameters, and the servo motor performs fatigue test on the torsion bar under test.

[0043] In step three, the tester sets the fatigue test parameters to the constant value loading controller via the keyboard, or switches the input device to a knob via the keyboard to set the fatigue test parameters to the constant value loading controller.

[0044] In step three, the constant value loading controller detects the actual drive signal output by the current driver and compares it with the set fatigue test parameters, and adjusts the drive signal output by the driver through feedback control.

[0045] The tester inputs a mode switching signal to the constant value loading controller by switching the input mode via a toggle switch. The constant value loading controller then drives a servo motor to perform constant torque or constant speed tests on the torsion bar under test via a driver.

[0046] The display screen shows the current fatigue test parameters, and the current input device is displayed after switching between keyboard and knob input in the input module.

[0047] The following describes in detail an EPS torsion bar fatigue constant value loading control system of the present invention.

[0048] The present invention discloses an EPS torsion bar fatigue constant value loading control system, comprising an input module, a control module, a drive module, and an execution module. The input module includes a knob and a keyboard, wherein the keyboard is used to set fatigue test parameters and can also switch input devices in the input module. The fatigue parameters include the rotation direction of the servo motor, the speed of the servo motor, and the torque of the servo motor.

[0049] The control module uses a constant value loading controller, which outputs the loading value of the fatigue test parameters to the drive module according to the fatigue test parameter settings of the input module. At the same time, it outputs an excitation start signal to control the drive module to start working. The specific model of the constant value loading controller in this embodiment of the invention is STM32F103C8T6.

[0050] The drive module uses a driver to output a drive signal to control the operation of the servo motor based on the load value of the fatigue test parameters input by the control module. The driver in this embodiment is a HIWIN driver.

[0051] The execution module uses a servo motor to provide constant torque or constant torque speed to test the torsion bar under test.

[0052] The test mode switching module uses a toggle switch to control the loading value of the fatigue test parameters input to the driver by the constant value loading controller. In an embodiment of the present invention, when the toggle switch is toggled upward, the constant value loading controller outputs the loading value of the servo motor torque to the driver, and the driver controls the servo motor to perform fatigue testing on the torsion bar under test with a constant torque; when the toggle switch is toggled downward, the constant value loading controller outputs the loading value of the servo motor speed to the driver, and the driver controls the servo motor to perform fatigue testing on the torsion bar under test with a constant speed.

[0053] The connection relationship of an EPS torsion bar fatigue constant value loading control system according to the present invention is described in detail below.

[0054] like Figure 3 As shown, the power input is processed through an AC / DC converter (AC220V-DC24V), a step-down chip (LM2576S-5.0), and an adjustable regulator (LM1117-3.3) to output 3.3V power to the power input terminals of the constant value load controller (STM32F103C8T6) and the display screen (OLED). The input terminal of the display screen (OLED) is connected to the output terminal of the constant value load controller via an SPI bus. The two ends of the fixed terminal of the variable resistor are connected to the power input terminal of the constant value load controller and the input terminal of the ADC module in the constant value load controller, respectively. The knob is connected to the sliding terminal of the variable resistor. The output terminal of the keyboard is connected to the input terminal of the constant value load controller. The output terminal of the constant value load controller is connected to the buzzer (BZ). The output terminal of the constant value load controller is connected to the PWM input terminal of the driver. The output terminal of the constant value load controller is connected to the direction pin (DIR) of the driver. The fault feedback pin of the driver is connected to the input terminal of the ADC module of the constant value load controller. The output terminal of the driver is connected to the servo motor via an encoder harness.

[0055] The following describes in detail a method for an EPS torsion bar fatigue constant value loading control system according to the present invention.

[0056] The testers mechanically connected the servo motor shaft to the torsion bar under test, and electrically connected the constant-load controller, driver, and servo motor. It should be noted that when performing a constant torque test on the torsion bar, the motor shaft and the torsion bar are connected via a rigid coupling to ensure no hysteresis or attenuation in torque transmission; when performing a constant speed test, the motor shaft and the torsion bar are connected via a corrugated coupling to absorb vibration and impact through the elastic body, avoiding interference from torque fluctuations on the rotational speed. The constant-load controller is connected to the driver via a control signal harness, and the driver is connected to the servo motor via the motor's three-phase wiring harness and the encoder wiring harness.

[0057] After the constant value load controller and driver are powered on, the constant value load controller outputs an excitation signal to the driver to control the driver to start.

[0058] The tester sets fatigue test parameters to the constant value loading controller via the input module, and the constant value loading controller loads the set fatigue test parameters to the driver. Specifically, the tester controls the servo motor's speed and torque output using both a keyboard and a knob. These two methods can be freely switched, with the keyboard key (B) used for switching. Keyboard control is the default. Referring to the example, to control the servo motor speed to 1234 rpm / min, press the number keys 1, 2, 3, and 4 sequentially. To output 45 N·m, press the keys 4 and 5 sequentially. The display will show the input number and the cursor, which will begin flashing. After inputting, press the "#" key to confirm the input, and the cursor will disappear and stop flashing. The "D" key can be used to cancel the current input, and the cursor will disappear. If an input error occurs, the "*" key can be used to return to the previous position and re-enter. Pressing the B key switches to knob input mode; the display will then show "Knob Input," indicating a successful switch. Rotating the knob clockwise increases the current servo motor speed or torque, while rotating it counterclockwise decreases it. It should be noted that when switching the servo motor's speed and torque settings via the keyboard or knob, a toggle switch is required. When the toggle switch is to the up position, the servo motor's torque can be set via the keyboard or knob; when the toggle switch is to the down position, the servo motor's speed can be set via the keyboard or knob. The tester can switch the servo motor's rotation direction using the "A" key on the keyboard, or use the "C" key for a one-click brake before switching the servo motor's rotation direction. In this invention, the constant-value loading controller detects the actual drive signal output by the current driver and compares it with the set fatigue test parameters, adjusting the driver's output drive signal through feedback control. Simultaneously, when the constant-value loading controller detects a driver malfunction, it triggers an alarm via a buzzer.

[0059] The driver controls the servo motor to work based on the load value of the fatigue test parameters input by the constant value load controller, and the servo motor performs fatigue testing on the torsion bar under test.

[0060] The display screen shows the current fatigue test parameters in real time, and displays the current input device after switching between keyboard and rotary input in the input module. For example... Figure 4 As shown, the display shows the current test mode "constant torque mode", the servo motor rotation direction "forward", the input device in the input module "keyboard input", the constant value loading controller's excitation start status for the driver "excited", the servo motor torque parameter setting "0.001N", and the servo motor speed parameter setting "001rpm".

[0061] This invention employs advanced control technology to achieve precise constant loading in torsion bar fatigue tests. Through a closed-loop control system, the loading force can be monitored and adjusted in real time, ensuring stability and accuracy during the test process.

[0062] The invention features a miniaturized and streamlined design that is easy to maintain and care for. The modular design allows for easy disassembly and replacement of components, reducing maintenance costs and time.

[0063] The invention has low design cost and is easy to operate. It is developed using low-cost process chips. The control method is also familiar to personnel, with buttons and knobs that can be selected by the user. At the same time, the real-time status is displayed on the screen, making it easy for testers to get started.

[0064] This invention significantly improves the ease of setting fatigue test parameters by incorporating an input module that supports both keyboard and knob input methods, allowing users to switch freely between them via the B key on the keyboard. The two input methods cater to the different operating habits of different testers, greatly improving parameter setting efficiency and shortening test preparation time.

[0065] This invention enables real-time visual monitoring of the testing process using an OLED display screen. The screen can display the test mode, servo motor rotation direction, current input device, excitation start status, speed, and torque parameters in real time, allowing testers to intuitively grasp the test status, facilitate timely detection and adjustment of parameter anomalies, and improve the controllability of the testing process.

[0066] This invention significantly improves the safety and reliability of the system by setting up a linkage mechanism between the buzzer and the driver fault feedback.

[0067] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A fatigue constant-value loading control system for EPS torsion bars, characterized in that: It includes an input module, a control module, a drive module, an execution module, and a test mode switching module. The output of the input module is connected to the input of the control module, the output of the control module is connected to the input of the drive module, the output of the drive module is connected to the input of the execution module, the execution module is connected to the torsion bar under test, and the output of the test mode switching module is connected to the input of the control module.

2. The EPS torsion bar fatigue constant value loading control system as described in claim 1, characterized in that: The input module inputs the modified values ​​of the fatigue test parameters to the control module, the control module inputs the loading signal of the fatigue test parameters to the drive module, the drive module outputs the drive signal to the execution module, and the test mode switching module outputs the test mode switching signal to the control module.

3. The EPS torsion bar fatigue constant value loading control system as described in claim 1, characterized in that: The input module includes a knob and a keyboard.

4. The EPS torsion bar fatigue constant value loading control system as described in claim 1, characterized in that: The control module employs a constant value loading controller, and the output of the constant value loading controller is connected to a display screen.

5. The EPS torsion bar fatigue constant value loading control system as described in claim 1, characterized in that: The drive module uses a driver; the execution module uses a servo motor; and the test mode switching module uses a toggle switch.

6. A method for an EPS torsion bar fatigue constant value loading control system as described in any one of claims 1-5, characterized in that: Step 1: The tester mechanically connects the motor shaft of the servo motor to the torsion bar under test, and electrically connects the constant value load controller, driver and servo motor; Step 2: After the constant value load controller and driver are powered on, the constant value load controller outputs an excitation signal to the driver to control the driver to start; Step 3: The tester sets the fatigue test parameters to the constant value loading controller through the input module, and the constant value loading controller loads the set fatigue test parameters to the driver; Step 4: The driver controls the servo motor to work according to the fatigue test parameters, and the servo motor performs fatigue test on the torsion bar under test.

7. The method for an EPS torsion bar fatigue constant value loading control system as described in claim 6, characterized in that: In step three, the tester sets the fatigue test parameters to the constant value loading controller via the keyboard, or switches the input device to a knob via the keyboard to set the fatigue test parameters to the constant value loading controller.

8. The method for an EPS torsion bar fatigue constant value loading control system as described in claim 6, characterized in that: In step three, the constant value loading controller detects the actual drive signal output by the current driver and compares it with the set fatigue test parameters, and adjusts the drive signal output by the driver through feedback control.

9. The method for an EPS torsion bar fatigue constant value loading control system as described in claim 6, characterized in that: The tester inputs a mode switching signal to the constant value loading controller by switching the input mode via a toggle switch. The constant value loading controller then drives a servo motor to perform constant torque or constant speed tests on the torsion bar under test via a driver.

10. The method for an EPS torsion bar fatigue constant value loading control system as described in claim 6, characterized in that: The display screen shows the current fatigue test parameters, and the current input device is displayed after switching between keyboard and knob input in the input module.

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