A method for detecting breaking torque of a rear wiper arm of an automobile

Abstract

The invention discloses a method for detecting the breaking torque of a rear wiper arm of an automobile, characterized in that the device involves a mechanical part and a control part, wherein the mechanical part comprises a servo motor (1), a reducer (2), a torque sensor (3) and a rotation blocking device (4), the control part controls the servo motor (1) to rotate in the forward direction, and then drives the rear wiper arm (5) of the wiper to rotate at a speed of 5 revolutions per minute after being decelerated by the reducer (2), and at the same time, the rotation blocking device (4) blocks the rotation of the rear wiper arm of the wiper, the torque sensor (3) detects the torque applied to the rear wiper arm (5), and LABVIEW programming is used to establish an array to compare the torque values, collect the maximum torque, until the rear wiper arm (5) breaks, the servo motor (1) rotates in the reverse direction, and the parts are removed. In the whole loading and unloading process of the invention, the human interface is interchanged, and the torque value is displayed in real time.

Description

Technical Field

[0001] The invention relates to a torque detection, in particular to a method for detecting the breaking torque of a wiper arm of a rear windshield wiper of an automobile. Background Art

[0002] The wiper arm of the rear windshield wiper is an important part of the rear windshield wiper. This part is a plastic part that needs to transmit torque and withstand certain torque requirements. If the torque of the wiper arm cannot meet the requirements, it will break during use and the product will fail. Therefore, the torque inspection of the wiper arm of the rear windshield wiper must be carried out. The test requirements are as follows:

[0003] 1. Drive the rear wiper arm of the car to rotate at a speed of 5 revolutions per minute;

[0004] 2. Detect the torque curve over time until the rear wiper arm of the car breaks.

[0005] After investigating the global automotive wiper industry, it was found that there is no complete rear wiper arm torque detection equipment, most of which are relatively simple and incomplete in functions. Summary of the invention

[0006] The purpose of the present invention is to provide a method for detecting the breaking torque of a rear wiper arm of an automobile. The method is in accordance with the test standard requirements: driving the rear wiper arm to rotate at a speed of 5 revolutions per minute, and blocking the rear wiper arm until the rear wiper arm breaks, and collecting the torque when the rear wiper arm breaks. During the entire loading and unloading process, the human interface is interchanged and the torque value is displayed in real time.

[0007] The technical solution of the present invention:

[0008] A method for detecting the breaking torque of a rear wiper arm of an automobile, the equipment involves a mechanical part and a control part, wherein the mechanical part includes a servo motor, a reducer, a torque sensor and a blocking rotation device, the servo motor is connected to the reducer, the reducer is connected to the torque sensor, the servo motor drives the rear wiper arm to rotate after being decelerated by the reducer, the torque sensor collects the torque generated by the rear wiper arm being blocked by the blocking rotation device, the blocking rotation device includes a vertical plate, a blocking plate and a lower fixed block; the control part uses LABVIEW as a host computer and PLC as a slave computer, and realizes the following functions through program compilation: when the servo motor rotates forward, it drives the rear wiper arm to rotate to the blocking rotation device, at which time the rear wiper arm stops rotating, the servo motor continues to apply a rotational torque to the wiper arm, the torque sensor detects the loading torque of the rear wiper arm and displays a real-time curve until the rear wiper arm breaks, and collects the breaking torque, the servo motor is unloaded when it rotates reversely, and the rear wiper arm is removed, and the whole process realizes human-machine exchange.

[0009] The present invention has the following characteristics:

[0010] 1. The servo controller is used to control the servo motor. After programming, the motor speed can be accurately controlled. This device uses a servo motor as the driving source, a reducer to reduce speed, and a PLC to output the control quantity, accurately achieving 5 rpm control.

[0011] 2. Solved the problem of software interconnection between different companies. LABVIEW is from NI of the United States, and PLC is from Siemens of Germany. By programming, the problem of control protocol was solved and the forward and reverse control of the servo motor was realized.

[0012] 3. The detection torque is collected in real time and a curve of torque over time is generated, which facilitates the observation of the detection personnel and the preservation of data.

[0013] 4. How to select the maximum torque value from the collected torque values? This device uses LABVIEW to compile a program to establish an array, and compares the collected torque values ​​in real time to obtain the maximum torque value, which is the maximum breaking torque of the rear scraper arm, and displays it. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the mechanical part of the present invention.

[0015] Figure 2 This is the system architecture diagram of the present invention.

[0016] Figure 3 This is the wiring diagram of PLC and intermediate relay.

[0017] Figure 4 This is the LABVIEW interface diagram.

[0018] Figure 5 It is a schematic diagram of the structure of the device for blocking rotation.

[0019] In the figure: 1. servo motor, 2. reducer, 3. torque sensor, 4. blocking device for rotation, 5. rear wiper arm, 6. vertical plate, 7. blocking plate, 8. lower fixing block. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0021] See also Figure 1A method for detecting the breaking torque of a rear wiper arm of an automobile, the device involves a mechanical part and a control part, wherein the mechanical part includes a servo motor 1, a reducer 2, a torque sensor 3 and a blocking rotation device 4, the servo motor 1 is connected to the reducer 2, the reducer 2 is connected to the torque sensor 3, the servo motor 1 drives the rear wiper arm 5 to rotate after being decelerated by the reducer 2, the torque sensor 3 collects the torque generated by the rear wiper arm 5 being blocked by the blocking rotation device 4, the blocking rotation device 4 includes a vertical plate 6, a blocking plate 7 and a lower fixed block 8 The control part uses LABVIEW as the upper computer and PLC as the lower computer. After programming, the following functions are realized: when the servo motor rotates forward, it drives the rear wiper arm 5 to rotate to the blocking rotation device 4. At this time, the wiper arm 5 stops rotating, and the servo motor continues to apply a rotation torque to the wiper arm. The torque sensor 3 detects the loading torque of the rear wiper arm and displays the real-time curve until the rear wiper arm 5 breaks and collects the breaking torque. When the servo motor 1 rotates reversely, it is unloaded and the rear wiper arm 5 is removed. The whole process realizes human-machine exchange.

[0022] Specifically: the control part controls the servo motor 1 to rotate forward, and then drives the rear wiper arm 5 to rotate at a speed of 5 rpm after being decelerated by the reducer 2. At the same time, the blocking rotation device 4 blocks the rotation of the rear wiper arm. The torque sensor 3 detects the torque applied to the rear wiper arm, and LABVIEW programming is used to establish an array to compare the torque values, and the maximum torque is collected until the rear wiper arm breaks. The servo motor 1 then rotates in the opposite direction to remove the parts.

[0023] The control part utilizes the combination of PLC and two intermediate relays to control the forward and reverse rotation of the servo motor through the output of PLC.

[0024] Lower computer PLC program: According to the PLC output voltage of 0-10V and the forward and reverse requirements of the servo motor, the intermediate relay is used to realize the forward and reverse rotation of the voltage, that is, the conversion from -10V to +10V, and the motor speed is controlled from 3000 / min in the reverse direction to 3000 / min in the forward direction. The D / A conversion data is shown in Table 1. The PLC outputs the digital quantity 5333, and the speed of the servo motor is controlled to 500rpm, which is 5 rpm after being decelerated by the reducer.

[0025] Table 1 PLC parameter setting table

[0026] Parameter name Parameter range Settings Servo motor speed 0~3000rpm 500 rpm (the speed that this device needs to be set to) PLC digital quantity 0~32000 5333 PLC analog 0~10V 1.5625V

[0027] Host computer LABVIEW program: Design of switching quantity loading and unloading using Boolean array. The corresponding table 2 about the conversion of Boolean array to binary value is as follows:

[0028] Table 2 LabVIEW loading and unloading parameter settings

[0029] load uninstall Convert the output binary number 0 0 0 1 0 1 0 1 2 1 1 3

[0030] Compile LABVIEW program to control PLC output switch quantity:

[0031] 1) Send the instruction "68 20 20 68 02 00 7C 32 01 00 00 00 00 00 0E 00 05 0501 12 0A 10 02 00 01 00 00 82 00 00 00 00 04 00 08 00 87 16" to the PLC. The function is to set the Q0.0-Q0.7 ports of the PLC to 0, so that the servo motor is in a stopped state.

[0032] 2) Send the instruction "68 20 20 68 02 00 7C 32 01 00 00 00 00 00 0E 00 05 0501 12 0A 10 02 00 01 00 00 82 00 00 00 00 04 00 08 03 8A 16" to the PLC. The function is to set the Q0.0 and Q0.1 ports of the PLC to 1 to realize the forward rotation of the servo motor.

[0033] 3) Send the instruction "68 20 20 68 02 00 7C 32 01 00 00 00 00 00 0E 00 05 0501 12 0A 10 02 00 01 00 00 82 00 00 00 00 04 00 08 05 8C 16" to the PLC. Its function is to set the Q0.0 and Q0.2 ports of the PLC to 1 to realize the reverse rotation of the servo motor.

[0034] Compile LABVIEW program to collect PLC analog quantity:

[0035] 1) LABVIEW sends a read data command string to PLC: "68 1B 1B 68 02 00 6C 32 01 00 00 00 0000 0E 00 00 04 01 12 0A 10 04 00 01 00 01 84 00 03 20 8D 16", where "03 20" refers to VW100. The function of this instruction is to read the data in VW100 and perform programmable calculation on the data, which is the torque value.

[0036] 2) Display the changes of the collected torque over time as a curve, and establish a numerical value for the collected torque value, select the maximum value of the array until the scraper arm breaks, which is the maximum torque, such as Figure 4 shown.

[0037] The present invention has the following characteristics:

[0038] 1. Use a servo controller to control the servo motor, and after programming, realize accurate control of the motor speed. The present invention uses a servo motor as the driving source, a reducer to reduce speed, and a PLC to output the control amount, accurately realizing the control of 5 revolutions per minute.

[0039] 2. Solved the problem of software interconnection between different companies. LABVIEW is from NI of the United States, and PLC is from Siemens of Germany. By programming, the problem of control protocol was solved and the forward and reverse control of the servo motor was realized.

[0040] 3. The detection torque is collected in real time and a curve of torque over time is generated, which facilitates the observation of the detection personnel and the preservation of data.

[0041] 4. How to select the maximum torque value from the collected torque values. The present invention uses LABVIEW to compile a program to establish an array, compares the collected torque values ​​in real time, obtains the maximum torque value, which is the maximum breaking torque of the rear scraper arm, and displays it.

[0042] The undescribed parts involved in the present invention are the same as the prior art or are implemented by using the prior art.

Claims

1. A method for detecting the breaking torque of a rear wiper arm of an automobile, characterized in that: The device involves a mechanical part and a control part, wherein the mechanical part comprises a servo motor (1), a reducer (2), a torque sensor (3) and a blocking rotation device (4); the servo motor (1) is connected to the reducer (2), the reducer (2) is connected to the torque sensor (3), the servo motor (1) drives the rear wiper arm (5) to rotate after being decelerated by the reducer (2), the torque sensor (3) collects the torque generated when the rear wiper arm (5) is blocked by the blocking rotation device (4), and the blocking rotation device (4) comprises a vertical plate (6), a blocking plate (7) and a lower fixed block (8); the control part comprises a servo motor (1) and a control part; The control part uses LABVIEW as the upper computer and PLC as the lower computer. After programming, the following functions are realized: when the servo motor rotates in the forward direction, it drives the rear wiper arm (5) to rotate to the position of the blocking rotation device (4). At this time, the rear wiper arm (5) stops rotating, and the servo motor continues to apply a rotation torque to the wiper arm. The torque sensor (3) detects the loading torque of the rear wiper arm and displays a real-time curve until the rear wiper arm (5) breaks and collects the breaking torque. When the servo motor (1) rotates in the reverse direction, it unloads and removes the rear wiper arm (5). The whole process realizes human-machine exchange. Specifically, the control part controls the servo motor (1) to rotate in the forward direction, and then drives the rear wiper arm (5) to rotate at a speed of 5 revolutions per minute after being decelerated by the reducer (2). At the same time, the rotation blocking device (4) blocks the rotation of the rear wiper arm. The torque sensor (3) detects the torque applied to the rear wiper arm. An array is established by LABVIEW programming to compare the torque values ​​and collect the maximum torque until the rear wiper arm breaks. The servo motor (1) then rotates in the reverse direction to remove the parts.

2. A method for detecting the breaking torque of a rear wiper arm of an automobile as claimed in claim 1, characterized in that: The control part utilizes the combination of PLC and two intermediate relays to control the forward and reverse rotation of the servo motor through the output of PLC.

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