Universal windscreen wiper test system, device and method

Abstract

The invention discloses a universal windscreen wiper test system. The universal windscreen wiper test system comprises a communication unit based on USB-6343 and an upper computer based on a dynamic link library, the upper computer is a PC (Personal Computer) for sending a windscreen wiper test sequence by utilizing a dynamic link library; the communication unit comprises a USB-LIN (Universal Serial Bus-Local Interconnect Network) module for sending a control signal to the windscreen wiper and a USB-6343 acquisition card module for acquiring the operation information of the windscreen wiper; different windscreen wiper signals and water valve signals are sent through the PC upper computer, meanwhile, the encoder is used for collecting the position of a motor and collecting temperature information of a thermocouple, the LIN current transformer is used for collecting bus current, and LIN communication is used for obtaining information such as wiping frequency returned by the motor, so that comprehensive testing of the windscreen wiper system is achieved. And the comprehensiveness and accuracy of data acquisition are ensured, so that the universality of windscreen wiper detection is improved. Wiper state control and data acquisition are automatically carried out in the whole process through a control power supply and a communication signal of the upper computer, the movement of the wiper is not interfered, and efficient and stable results are achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of wiper testing, and specifically provides a general wiper testing system, device and method. Background Art

[0002] Automobile windshield wipers are crucial safety devices on vehicles, used to clear rainwater, snow and other debris on the windshield, ensuring clear vision for the driver and improving driving safety. During the R & D stage, it is necessary to test the functions and performance of the wipers to improve the reliability and stability of the entire vehicle.

[0003] When testing the functions and performance of the wipers, it is not only necessary to simulate the working conditions of the wipers in rainy days, but also to collect the real-time status of the wipers. Modern automobile windshield wiper testing devices tend to be automated, multi-functional and intelligent to ensure that the wipers can work stably and reliably in various complex environments.

[0004] The current wiper detection platform needs to be controlled based on the vehicle control circuit, resulting in a large and costly testing platform, limited information collection and restricted generality. In addition, some testing devices may have problems such as unstable test results and poor repeatability, which affect the accurate evaluation of the performance of the wipers.

[0005] The existing technology mostly conducts non-integrated manual tests on the functions of the wipers and cannot achieve process-based testing. It may require a large amount of time and labor costs, with a cumbersome testing process and low efficiency.

[0006] Therefore, a general wiper testing system, device and method are proposed. Summary of the Invention

[0007] The purpose of the present invention is to provide a general wiper testing system, device and method to solve the problems raised in the above background art.

[0008] To achieve the above purpose, the present invention provides the following technical solution: A general wiper testing system includes a communication unit based on USB-6343 and a host computer based on dynamic link libraries.

[0009] The host computer is a PC computer that sends wiper test sequences using dynamic link libraries.

[0010] The communication unit includes a USB-LIN module that sends control signals to the wiper and a USB-6343 acquisition card module that collects the operating information of the wiper.

[0011] A proximity switch module for detecting the time required for the wiper to move to the edge, an optoelectronic encoder module for collecting the wiper angle, a K-type thermocouple module for collecting the temperature of the wiper motor, and a LEM current transformer module for measuring the power supply current signal are connected to the USB-6343 acquisition card module.

[0012] Preferably: A relay module for controlling water spraying is further connected to the USB-6343 acquisition card module, and an electromagnetic water valve is connected to the relay module.

[0013] Preferably: A programmable power supply for setting the voltage and current of the wiper motor is further connected to the communication unit and the upper computer.

[0014] Preferably: The optoelectronic encoder module is connected to the USB-6343 acquisition card module through a difference counter.

[0015] A general wiper test device includes an integrated device box and a wiper bench;

[0016] The integrated device box includes a USB-6343 acquisition card, a USB-LIN, a relay, and a LEM current transformer;

[0017] A proximity switch and a crank-link mechanism for driving the wiper to operate are installed on the wiper bench;

[0018] The rotating shaft of the crank-link mechanism is connected to the optoelectronic encoder through a coupling.

[0019] Preferably: An electromagnetic water valve, a water spray pipeline, a water return pipeline, a water tank, and a water pump for simulating rainfall are further installed on the wiper bench.

[0020] Preferably: The LEM current transformer connects the programmable power supply to the USB-6343 acquisition card through a power cord.

[0021] A general wiper test method includes the following steps:

[0022] S1. Design a test sequence through the PC software NI-TestStand in the PC computer. Using dynamic link library technology, different dynamic link libraries are written for different devices connected to the USB-6343 acquisition card;

[0023] S2. Call the dynamic link library in NI-TestStand, input the required parameters, and establish a communication channel between the PC and the USB-6343 acquisition card;

[0024] S3. Design a test sequence file according to the existing conditions. In TestStand, different tests and operations are organized through the tree structure of the sequence file, main sequence, sub-sequence, step group, and step;

[0025] S4. Compare the variables collected in the test sequence with the expected results, and automatically output a test report which contains the results of the test comparison.

[0026] Preferably, in the step S2, information collected by the USB-6343 acquisition card can also be received through a dynamic link library and saved in the variables of the NI-TestStand software.

[0027] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0028] 1. By sending different wiper signals and water valve signals through the PC host computer, at the same time collecting the motor position by using an encoder, collecting the temperature information of the thermocouple, collecting the bus current by using a LEM current transformer, and obtaining information such as the wiping frequency returned by the motor by using LIN communication, a comprehensive test of the wiper system is realized, ensuring the comprehensiveness and accuracy of data collection, thereby improving the universality of wiper detection.

[0029] 2. Through the control power supply and communication signal of the host computer, the wiper state control and data collection are fully automated without interfering with the wiper movement, realizing the high efficiency and stability of the results.

[0030] 3. By setting the wiper sequence of the host computer, setting the control signal and the information to be collected, comparing the collected information with the expected value of the test content, and outputting a test pass / fail report, the process of manual comparison is reduced, saving manpower and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the test system of the present invention;

[0032] Figure 2 It is a schematic diagram of the front structure of the device box of the present invention;

[0033] Figure 3 It is a schematic diagram of the back structure of the device box of the present invention;

[0034] Figure 4 It is a schematic diagram of the structure of the wiper test bench of the present invention;

[0035] Figure 5 It is a schematic diagram of the test method of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0036] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention.

[0037] Please refer to Figures 1-5, the present invention provides a technical solution: a general windshield wiper test system, including a communication unit based on USB-6343 and a host computer based on dynamic link library;

[0038] The host computer is a PC computer that uses a dynamic link library to send a windshield wiper test sequence;

[0039] The communication unit includes a USB-LIN module that sends control signals to the windshield wiper and a USB-6343 acquisition card module that acquires the operating information of the windshield wiper.

[0040] A proximity switch module for detecting the time required for the windshield wiper to move to the edge is connected to the USB-6343 acquisition card module. When the windshield wiper moves to the edge position, the proximity switch emits a jump signal, and the USB-6343 acquisition card receives the signal.

[0041] An optoelectronic encoder module for acquiring the angle of the windshield wiper is connected to the crankshaft of the windshield wiper through a coupling. Initialize the optoelectronic encoder to determine the zero value of the optoelectronic encoder. During the movement of the windshield wiper, the angle of the windshield wiper is recorded in real time, and the signal is connected to the USB-6343 acquisition card through a difference counter.

[0042] A K-type thermocouple module for acquiring the temperature of the windshield wiper motor is installed on the motor to detect the temperature signal for monitoring whether the motor is overheated.

[0043] A LEM current transformer module for measuring the power supply current signal passes the power line through the LEM current transformer and sends the current signal of the power supply to the USB-6343 acquisition card. Connect the programmable power supply to the USB-6343 acquisition card to measure the power supply voltage.

[0044] The specific implementation manner based on the above modules is as follows:

[0045] Set the windshield wiper test sequence through the PC computer, and use the written dynamic link library to send to the programmable power supply, USB-LIN (VN1640) and NI USB-6343 acquisition card to enable the test signal. After receiving the signal, the programmable power supply sets the voltage and current of the windshield wiper motor.

[0046] After receiving the signal, USB-LIN (VN1640) sends signals such as cycle, intermittent, and docking to the windshield wiper motor. After receiving the signal, the windshield wiper returns the windshield wiper status information. The LIN instruction includes the windshield wiper total enable signal, brush frequency signal, windshield wiper working mode, jog mode enable, wash mode, emergency stop command, alternate docking, engine ignition signal, intermittent gear, ambient temperature, and vehicle speed.

[0047] The received instructions include the motor crank angle, motor crank speed, main wiper angle, main wiper speed, wiper frequency, parking position, stall detection, over-temperature detection, under-voltage detection, over-voltage detection, over-load detection, and wiper operation status.

[0048] A relay module for controlling water spraying is also connected to the USB-6343 acquisition card module. An electromagnetic water valve is connected to the relay module. The USB-6343 acquisition card has the ability to output a 5V voltage. After receiving a signal, NI USB-6343 controls the relay with the signal to achieve water spraying.

[0049] After receiving the signal, the wiper starts to move. The position of the wiper crank is recorded in real time through an optical encoder, and the time when the wiper reaches the edge each time is recorded through a proximity switch to calculate the wiper frequency.

[0050] As Figure 2 、 Figure 3 and Figure 4 shown: A general wiper test device includes an integrated device box and a wiper bench; the integrated device box includes a USB-6343 acquisition card, a USB-LIN, a relay, and a LEM current transformer;

[0051] The front interfaces of the integrated device box mainly include: a main power switch, a power indicator light, an encoder interface, a proximity switch interface, a thermocouple interface, and an electromagnetic water valve interface.

[0052] The back interfaces of the integrated device box mainly include: a board card power interface, a programmable power interface, a wiper motor interface, and a USB interface.

[0053] A proximity switch and a crank-link mechanism for driving the wiper to operate are installed on the wiper bench. The main function of the wiper bench is to connect the wiper motor to the four-bar mechanism for wiper test. For different vehicle models, the working conditions faced by the wiper are also different. Therefore, the test can be carried out by replacing the windshield. The rotating shaft of the crank-link mechanism is connected to the optical encoder through a coupling.

[0054] As Figure 2 shown: An electromagnetic water valve, a water spray pipeline, a water return pipeline, a water tank, and a water pump for simulating rainfall are also installed on the wiper bench, which can spray water on the wiper test platform to simulate rainfall.

[0055] As Figure 5 shown: A general wiper test method includes the following steps:

[0056] S1. Design a test sequence through the PC software NI-TestStand in the PC computer. Using dynamic link library technology, different dynamic link libraries are written for the USB-6343 acquisition card to connect different devices;

[0057] S2. Call the dynamic link library in NI-TestStand, input the required parameters, establish a communication channel between the PC and the USB-6343 acquisition card, and receive the information collected by the USB-6343 acquisition card through the dynamic link library and save it in the variables of the NI-TestStand software;

[0058] S3. Design a test sequence file according to the existing conditions. In TestStand, organize different tests and operations through the tree-like structure of sequence files, main sequences, sub-sequences, step groups, and steps;

[0059] S4. Compare the variables collected in the test sequence with the expected results, and automatically output a test report, which includes the results of the test comparison.

[0060] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A general windshield wiper test system, including a communication unit based on USB-6343 and a host computer based on dynamic link library, characterized in that: The host computer is a PC computer that uses a dynamic link library to send a windshield wiper test sequence; The communication unit includes a USB-LIN module for sending control signals to the windshield wiper and a USB-6343 acquisition card module for collecting the operating information of the windshield wiper; Connected to the USB-6343 acquisition card module are a proximity switch module for detecting the time required for the windshield wiper to move to the edge, an optoelectronic encoder module for collecting the angle of the windshield wiper, a K-type thermocouple module for collecting the temperature of the windshield wiper motor, and a LEM current transformer module for measuring the power supply current signal.

2. The general wiper test system according to claim 1, wherein: Also connected to the USB-6343 acquisition card module is a relay module for controlling water spraying, and an electromagnetic water valve is connected to the relay module.

3. The general wiper test system according to claim 1, wherein: Connected to the communication unit and the host computer is also a programmable power supply for setting the voltage and current of the windshield wiper motor.

4. A general windshield wiper test system according to claim 1, characterized in that: The optoelectronic encoder module is connected to the USB-6343 acquisition card module through a difference counter.

5. A general windshield wiper test device, characterized in that, Including an integrated device box and a windshield wiper bench; The integrated device box includes a USB-6343 acquisition card, USB-LIN, a relay, and a LEM current transformer; Installed on the windshield wiper bench are a proximity switch and a crank-link mechanism for driving the windshield wiper to operate; The rotating shaft of the crank-link mechanism is connected to the optoelectronic encoder through a coupling.

6. The general wiper test device according to claim 5, characterized in that: Also installed on the windshield wiper bench are an electromagnetic water valve for simulating rainfall, a water spraying pipeline, a water return pipeline, a water tank, and a water pump.

7. The general wiper test device according to claim 5, characterized in that: The LEM current transformer connects the programmable power supply to the USB-6343 acquisition card through a power line.

8. A general windshield wiper test method, characterized in that, Including the following steps: S1. Design a test sequence through the PC software NI-TestStand in the PC computer. Using dynamic link library technology, write different dynamic link libraries for different devices connected to the USB-6343 acquisition card; S2. Call the dynamic link library in NI-TestStand, input the required parameters, and establish a communication channel between the PC and the USB-6343 acquisition card; S3. Design a test sequence file according to the existing conditions. In TestStand, organize different tests and operations through the tree structure of sequence file, main sequence, sub-sequence, step group, and step; S4. Compare the variables collected in the test sequence with the expected results, and automatically output a test report, which contains the results of the test comparison.

9. A general wiper test method according to claim 8, characterized in that: In step S2, it is also possible to receive the information collected by the USB-6343 acquisition card through the dynamic link library and save it in the variables of the NI-TestStand software.

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