CN203204400U - Automobile windshield wiper assembly stand monitoring system - Google Patents

Abstract

The utility model relates to an automobile windshield wiper assembly stand monitoring system. Currently, windshield wiper experiment stands of factories are mainly simple stands which simulate automobile windshield wiper running environments, the windshield wiper running operation and data recording are completed by testers, and thus workload is increased, and data recording error is easily made. The automobile windshield wiper assembly stand monitoring system is composed of an ARM9 processor and an experiment table. The ARM9 processor is connected with a switching circuit, a host computer, a network card interface circuit, a USB interface circuit, an LCD display module and a Nand flash memory. The automobile windshield wiper assembly stand monitoring system is used for monitoring indoor environment temperature and humidity, temperatures outside and inside a motor, voltage and current during the running of the motor, the rotating speed of the motor, and the like in real time. Field operation shows that the system is convenient for operation, excellent in performance, and can help to improve test precision and work efficiency.

Description

Automobile wiper assembly bench monitoring system

Technical field:

The utility model relates to a monitoring technology and an embedded technology, in particular to a monitor system for an automobile wiper assembly stand.

Background technique:

The car wiper system assembly includes the wiper motor and controller. There are three working modes: clearance, low speed and high speed. The motor speed in low speed mode is generally 35-40 rpm, and the motor speed in high speed mode is generally 50-55 rpm. /min, under the gap mode, the motor stays for a certain period of time per revolution, generally 3 seconds, 6 seconds or 5 seconds, 10 seconds. For wiper assembly manufacturers, newly developed and improved products need to conduct various experiments according to industry standards, and new wiper assemblies also need to undergo routine sampling tests. Therefore, wiper test benches are a must for manufacturers. At present, the wiper test benches of various manufacturers are mainly simple benches for simulating the operating environment of car wipers. The wiper operation and data recording are all completed by the experimenters, which increases the workload and easily causes data recording errors. Combining the automatic test technology with the wiper test bench, a set of automatic monitoring system for the wiper bench is designed to improve the automation of the wiper test bench, realize the automatic test and record of the operating parameters of the wiper assembly by the manufacturer, and help the manufacturer to master the product The operating status provides technical support for the development direction of the wiper system.

Invention content:

The purpose of this utility model is to provide a car wiper stand monitoring system, adopt embedded Linux technology and ARM processor to develop a set of wiper stand monitoring system, transplant LINUX operating system on the ARM processor, run on the operating system The monitoring software avoids the trouble of tedious manual recording of experimental data by the staff. The software is operated through the touch screen, which avoids the staff to press the cumbersome switch button to control the equipment, and realizes the automation process of the overall equipment. The main functions completed include real-time monitoring of the indoor ambient temperature and humidity, the external and internal temperature of the motor, the voltage and current of the motor when it is running, and the speed of the motor. The on-site operation shows that the system is easy to operate and has superior performance, which can improve the test accuracy and work efficiency.

The purpose of this utility model is achieved in that:

A kind of automobile wiper assembly bench monitoring system, its composition comprises: ARM9 processor, test bench, described ARM9 processor connects switch circuit, upper computer, network card interface circuit, USB interface circuit, LCD display module, Nand flash memory , Temperature and humidity sensor, voltage and current sensor, motor temperature sensor, speed acquisition signal device, angle sensor.

In the monitor system of the automobile wiper assembly bench, the switch circuit is connected to the test bench, and the temperature and humidity sensor, voltage and current sensor, motor temperature sensor, speed acquisition signal device, and angle sensor are installed on the test bench.

Described automobile windshield wiper assembly bench monitoring system, in described host computer, LINUX operating system and monitoring software are installed, in described LINUX operating system, embedded graphical user interface GUI is installed, and described monitoring software is based on The ARM9 processor is displayed on the screen through the LCD display module, and the LCD display module is installed on the surface of the monitoring system shell and on the wiper stand.

Beneficial effect:

1. This utility model combines the automatic test technology with the wiper test bench, and designs a set of wiper bench automatic monitoring system to improve the automation of the wiper test bench, and realize the automatic testing and monitoring of the operating parameters of the wiper assembly by the manufacturer. Records provide technical support for manufacturers to grasp the operating status of products. The system is easy to operate and has superior performance, which can improve test accuracy and work efficiency.

The utility model adopts an embedded operating system, which is easy to operate and stable in running state when faced with multi-task, multi-protocol and complex applications. It has the effects of low power consumption, low cost and high performance.

The monitoring software of the utility model is based on the ARM9 processor and displays on the screen through the LCD display module. The LCD display module is installed on the surface of the monitoring system shell and on the wiper stand, and the staff can monitor the equipment beside the test stand. Monitoring and control saves the tediousness of traditional computer monitoring, and has good portability. Data can be backed up and managed through the internal SD card interface and USB interface, and can also be monitored and managed in real time through a remote computer.

The monitoring system of the utility model can automatically control three operation modes of the wiper assembly, the gap, the low speed and the high speed; The power supply voltage and current of the wiper assembly, the speed of the motor, the temperature of the outer surface and inside of the motor, the temperature and humidity of the indoor environment, and the opening of the wiper; can record the working times and working hours of the wiper assembly.

Description of drawings:

Accompanying drawing 1 is this product overall structure schematic diagram.

Accompanying drawing 2 is a schematic diagram of the current signal acquisition and conditioning circuit of accompanying drawing 1.

Accompanying drawing 3 is a schematic diagram of the voltage signal acquisition and conditioning circuit of accompanying drawing 1.

Accompanying drawing 4 is a schematic diagram of the temperature and humidity sensor in accompanying drawing 1.

Accompanying drawing 5 is the schematic diagram of the motor temperature acquisition circuit of accompanying drawing 1.

Accompanying drawing 6 is the schematic diagram of LCD interface circuit in accompanying drawing 1.

Accompanying drawing 7 is a schematic diagram of program structure in accompanying drawing 6.

Accompanying drawing 8 is the circuit diagram of central processing unit in accompanying drawing 3.

Accompanying drawing 9 is a schematic diagram of application development process.

Accompanying drawing 10 is a schematic diagram of the embedded GUI login window interface in accompanying drawing 9.

Accompanying drawing 11 is the schematic diagram of embedded GUI monitoring interface in accompanying drawing 10.

Detailed ways:

Example 1:

A kind of automobile wiper assembly bench monitoring system, its composition comprises: ARM9 processor 1, test bench 2, described ARM9 processor connects switch circuit 3, upper computer 4, network card interface circuit 5, USB interface circuit 6, LCD Display module 7, Nand flash memory 8, temperature and humidity sensor 9, voltage and current sensor 10, motor temperature sensor 11, speed acquisition signal device 12, angle sensor 13.

Example 2:

The automobile wiper assembly bench monitoring system described in embodiment 1, the described switch circuit 3 is connected to the test bench 2, the described temperature and humidity sensor 9, the voltage and current sensor 10, the motor temperature sensor 11, the rotational speed acquisition signal device 12, The angle sensor 13 is installed on the test bench 2 .

Example 3:

The automobile wiper assembly stand monitoring system described in embodiment 1 or 2, described host computer, is equipped with LINUX operating system and supervisory software, in described LINUX operating system, embedded graphical user interface GUI is installed, described The monitoring software is based on the ARM9 processor 1 and displayed on the screen through the LCD display module 7, and the LCD display module 7 is installed on the surface of the monitoring system shell and on the wiper stand.

Example 4:

The automobile wiper assembly stand monitoring system described in the above-mentioned embodiment, described wiper stand monitoring system, realizes the collection and processing of rotating speed based on ARM9 processor 1, described wiper stand monitoring system, based on ARM9 processor 1 realizes the control of motor clearance, low speed, and high speed. The wiper bench monitoring system uses NAND flash memory with large-capacity memory, which can store the LINUX system and provide users with more There is space for storing data, and the erasing and writing operation efficiency is high. The wiper stand monitoring system adopts SD card interface circuit and USB interface circuit, which can provide users with the expansion of stored data and can also exchange data with the PC terminal. Synchronize.

Example 5:

In the automobile wiper assembly bench monitoring system described in the above-mentioned embodiment, the described current sensor adopts Honeywell CSNP-661 high-precision Hall sensor with an accuracy of 0.5%, and the voltage sensor selects CLSM-10MA as the Hall sensor. In the sensor, the ratio of the current passing through the high-voltage end resistor R10 to the current passing through the low-voltage end R11 is 5:2, and the values of R10 and R11 are respectively selected as 3K ohms and 400 ohms. The conditioning circuit is shown in the figure, and the sampling value of the computer is 0-10V Corresponding to 0-10000, the conversion formula of voltage V and sampling set voltage Vc is:

               。           =

.

Embodiment 6:

The vehicle wiper assembly bench monitoring system described in the above-mentioned embodiment, the acquisition and processing of the rotational speed: a reset disk is installed on the reducer of the wiper motor, and a pulse signal will be generated on the reset line every time the motor rotates, and the pulse signal is used to It can detect the motor speed and record the working times of the motor. The rated operating voltage of the wiper motor is 12V and 24V. The pulse amplitude generated on the reset disk also corresponds to 12V and 24V. The maximum operating voltage of the ARM processor is 5V. Resistor voltage division can be used to meet level matching. For the pulse waveform, two NAND gates are used for waveform shaping, and the NAND gate uses a 74LS14 integrator. The circuit is shown in Figure 3, including filtering and limiting circuits. Use the timer in ARM to test the motor speed. The motor generates a pulse every revolution. Use the timer to measure the time Td between two pulses to calculate the motor speed:

.

Embodiment 7:

The automobile wiper assembly bench monitoring system described in the above-mentioned embodiment, Nand Flash interface circuit: the link between Nand Flash and S3c2440 is relatively few: 8 I/O pins IO0～IO7, 5 enabling signals nWE, ALE, CLE, nCE, nRE, 1 status pin RDY/B, 1 write protection pin nWP. Addresses, data and commands are all transmitted through 8 I/O pins with the cooperation of these enable signals. When writing addresses, data, and commands. The nCE and new signals must be low, and they are latched when the new signal rises. The command latch enable signal CLE and the address latch signal ALE are used to distinguish whether the command or the address is transmitted on the I/O pin. Specific operations such as: The write operation of Nand Flash is generally in units of pages, but only a part of a page can be written. After issuing the command word 80, followed by 4 address sequences, and then sending data to the Flash, the maximum can reach 528 bytes, and then issuing the command 10h to start the write operation. At this time, the Flash will automatically complete the write and verify operations. Once the command word 10h is issued, you can know whether the current write operation is completed and successful by reading the status command 70h. The writing operation of Nand Flash is similar to reading. The specific operation is 1. Set NFCONF=0x300, NFCONT=(1<<4)|(1<<1)|(1<<0), enable NAND Flash controller, initialize ECC, NAND Flash chip select signal nFCE= 1. Set TACLS=0, TWRPH0=3, TWRPH1=0. The meaning of these timing parameters is: TACLS=1 HCLK clock, TWRPH0=4 HCLK clocks, TWRPH1=1 HCLK clock. 2. Before operating the NAND Flash for the first time, usually reset the NAND Flash, send the chip select signal NFCONF&=~(1<<1), send the reset command NFCMD=0xff, and then query the NFSTAT bit 0 in a loop until it is equal to 1 ;Finally disable the chip select signal, and then enable it when NAND Flash is actually used, and then circularly query the NFSTAT bit 0 until it is equal to 1. Finally, disable the chip select signal, and enable it again when NAND Flash is actually used; 3. Issue a read command , First enable NAND Flash, NFCONT&=~(1<<1), send the read command NFCMD=0; 4. Send the address signal NFADDR=addr&0xff 5. Circularly query the NFSTAT bit 0 until it is equal to 1, then you can read data 6. Read the NFDATA register 512 times continuously, and get a page of 512 bytes of data. 7. Finally, disable the chip select signal of NAND Flash NFCONT|=(1<<1).

Embodiment 8:

The automobile wiper assembly bench monitoring system described in the above-mentioned embodiment adopts digital relative humidity and temperature sensor SHT11 produced by Swiss Sensirion Company for temperature and humidity. The chip integrates temperature and humidity sensor, signal amplification and conditioning, A/D conversion, I ² The C bus interface is all integrated in one chip, and the peripheral circuit is very simple. The interface circuit is shown in the figure. SHT11 passes I ² The C bus transmits the digital quantity of humidity and temperature to ARM, and the output characteristic of humidity is nonlinear, which can be corrected according to the following formula:

RHLiner=C1+C2SORH+C3SORH2

In formula 3, SORH is the relative humidity measurement value of the sensor, and the coefficient values are as follows: C1=-4, C2=0.0405, C3=-2.8*10-6

The linearity of the SHT11 temperature sensor is very good. The following formula can be used to convert the temperature digital quantity into an actual temperature value: T=d1+d2SOT d1=-40, d2=0.01.

Embodiment 9:

For the monitoring system of the automobile wiper assembly bench described in the above-mentioned embodiment, the LCD interface circuit is shown in the figure, wherein VD0~VD22 are address signals and GPC9~GPD1 of the S3C2440, VD23 corresponds to GPE14, and IICSDA and SCL correspond to GPE14~GPE15 , LCD_PWR corresponds to GPG14; VFRAME corresponds to GPC13, TSXP and TSYP are horizontal and vertical coordinates, which are converted into digital signals by AD and displayed on the screen; there are 3 files related to LCD display, lcddrv.c, which encapsulates the LCD controller and palette access function, set the display mode of the LCD, turn on/off the LCD, set the palette, etc.; framebuffer.c directly operates the frame buffer (frame buffer) to realize functions such as drawing points, drawing lines, drawing concentric circles, and clearing the screen. lcdlib.c calls the first two numbers to perform various operations on the LCD. The program structure is shown in the figure.

Example 10:

The automobile wiper assembly bench monitoring system described in the above-mentioned embodiment, the realization of embedded operating system, why the embedded operating system of this system adopts Linux, is because it has following characteristics with respect to other embedded operating systems: kernel Small, high efficiency; open source code, competitive price; support multiple CPUs, easy system transplantation; perfect network functions, etc., the main operations include Linux kernel transplantation and compilation, Linux kernel transplantation on the ARM platform, configuration of the kernel The general steps are: 1. Decompress the kernel file, use the command tar xvjf linux-2.6.25.8.tar.bz2 -C ./ to decompress the kernel to the current directory; 2. Configure the cross compiler This design uses the latest 4.3 .3 version, it supports EABI technology, and then configure the environment variables to be effective for the cross compiler, that is, enter the configuration table after the command gedit /etc/profile, add the directory pathmunge /4.3.3/bin under the path, and finally use source 、 etc/ The profile command makes the cross-compiler take effect 3. To apply a patch, enter the configured kernel patch and use the command path –p1 <patch file, 4. Configure the kernel, use the configuration file provided by the manufacturer here, that is, use the command cp config_manufacturer.config , here the manufacturer refers to the configuration file provided by the manufacturer, and then make menuconfig4, compile the kernel, and make UImage, which completes the kernel transplantation and configuration process.

Example 11:

The automobile wiper assembly bench monitoring system described in the above-mentioned embodiment, the realization of embedded operating system, the embedded graphical user interface GUI has adopted QT/Embedded, and version is 4.2.2 editions, and the installation of GUI and transplantation are divided into 4 Step: The first step is to establish the embedded file system Busybox; the second step is to compile and install QtopiaCore; install the cross compiler: this design uses the 4.3.3 version of the compiler, enter tar xvfj EABI_4.3.3 in the current directory _2009.tar.bz2 –C ./ Decompress the compiler, make the compiler effective gedit /etc/profile, and finally add the following content pathmunge/4.3.3/bin in the path directory, the third step is to transplant to the target platform: in the PC LINUX interrupt execution./x86-qtopia-2.2.0-kongqueror_build starts to compile the GUI, the fourth step is application development, the specific development process is shown in the figure. Enter gedit ui2cpp in the directory to enter the document window, enter QTDIR/bin/uic –o first.h first.ui QTDIR/bin/uic –o first.cpp –impl first.h first.ui QTDIR/bin/uic – o first.h –o moc_first.cpp ; Finally, enter ./ui2cpp in the current directory. At this time, the script conversion file has been created, and the final graphical interface is shown in the figure.

Example 12:

The automobile wiper assembly bench monitoring system described in the above-mentioned embodiment, accompanying drawing 7 illustrates

Lcddrv.c 14 encapsulates the access function of the LCD controller and the palette, which can set the display mode of the LCD, turn on/off the LCD, set the palette, etc.;

Framebuffer.c 15 directly operates the frame buffer (frame buffer), and realizes functions such as drawing points, drawing lines, drawing concentric circles, and clearing the screen;

Lcdlib.c 16 calls the functions provided by the first two files to perform various operations on the LCD;

Mian.c 17 provides a menu to select different display modes to operate the LCD, here we choose 240*320, 16bpp display mode.

Example 13

The automobile wiper assembly bench monitoring system described in the above-mentioned embodiment, accompanying drawing 9 illustrates

1. Build the host development environment

1. Install g++. When compiling QT, some tool libraries that come with QT are required. When compiling QT, some tools that run on the host will be generated, and some header files and libraries of X11 will be used. Such as /user/X11R6/include/X11/X1ib.h.

Install the integrated development environment

When developing GUI programs in QT, use Kdevelop, and install konsole together with the following instructions:

sudo apt-get install kdevelop3

sudo apt-get install console

After installation, it appears in the desktop menu applications->programming.

two. Install cross-compilation, install QT

1. First compile and install the QT library, mainly the libraries involved in the system, system commands, equipment used when executing QT, compiler version, etc.;

2. Install and run QT on the wiper assembly monitoring system

The root file system of the monitoring system is stored in /works/nfs_root/fs_qt on the host, and jpeg library, uuid library, font library, time zone file, etc. are added to this directory. When the application program is compiled, use the Kdevelop tool installed above to compile the program.

Claims (3)

1. a kind of automobile wiper assembly bench monitoring system, its composition comprises: ARM9 processor, test bench, it is characterized in that: described ARM9 processor connects switch circuit, upper computer, network card interface circuit, USB interface circuit, LCD Display module, Nand flash memory, temperature and humidity sensor, voltage and current sensor, motor temperature sensor, speed acquisition signal device, angle sensor. 2. automobile wiper assembly stand monitoring system according to right 1, it is characterized in that: described switch circuit connects test stand, described temperature and humidity sensor, voltage and current sensor, motor temperature sensor, speed acquisition signal device, The angle sensor is installed on the experimental bench. 3. The vehicle wiper assembly stand monitoring system according to claim 1, characterized in that: said LCD display module is installed on the surface of the monitoring system shell and on the wiper stand.

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