基于LIN总线的汽车智能雨刷设计外文文献翻译中英文翻译外文翻译.docx

1、基于LIN总线的汽车智能雨刷设计外文文献翻译中英文翻译外文翻译外文文献及译文文献、资料题目：Design and Implementation Intelligent Car Wiper Based on LIN Bus文献、资料来源： Trans Tech期刊文献、资料发表（出版）日期： 2012年04月12日学生姓名： 学号： 系 别： 专 业： 指导教师： 职称： 2017年5月19日Design and Implementation intelligent car wiper based on LIN BusAbstract：Contrary to the problem that t

2、he process of rainy car manual manipulation causes much interference to the driver, a design method for intelligent car wiper based on the LIN bus is proposed. It adopts the chips MC9S08DZ60 and MC33661 as the controller from Freescale that dedicated to the automotive electronics field. During its w

3、orking, with the rain sensor sensing the magnitude of outside rainfall, it can automatically adjust the wiper speed, achieving the intelligent wiper control.Keywords: Rain wiper control, LIN bus, Intelligent, Freescale.IntroductionThe number of wiring harnesses is increasing at the double speed by t

4、he growing in the quantity of automotive electronic components. The increasing of wiring harness occupies the interior effective space and enlarges the cost of vehicle. On the other hand, it impedes the improvement of vehicle reliability. LIN bus, as a low-cost serial bus technology meeting the requ

5、irements of car body electronics, can provide a low-cost and short-distance network connection for electric machines, switches, sensors and light1.As an important part of the electronic automotive vehicle, car wiper plays a particularly important role in the rain and fog weather. At present, the aut

6、omobile wiper control system in the market mainly adjusts wiper speed through manually. The manual adjustment will not only cause some interference to the drivers energy but also can not promptly respond to the sudden incident such as rain splashing on the windshield, increasing the accident probabi

7、lity. Therefore, its especially important to install the intelligent car wiper on the car body.Based on the above introduction, the text designs and implements an intelligent car wiper based on the LIN bus. We select the Freescale chip MC9S08DZ60 and MC33661 as the controller to complete the hardwar

8、e design and communicate with the rainfall monitoring devices or central controller through the LIN bus. Its overall block diagram can be seen in Figure 1.Fig.1 The overall block diagram of intelligent car wiperLIN bus protocolProtocol Overview：LIN bus network consists of a master node and several s

9、lave nodes. Each node contains a secondary communication task decomposed to the task of sending and receiving. The master node also contains an additional major sending task. The LIN bus communication is usually composed of the responses generated by the master node, namely the main task and the sec

10、ondary task2.There are several main features in the LIN protocol. First, its in low cost and carried out based on the common SCI / UART interface. Secondly, it uses the mode of one master and several slaves. The data priority is determined by the master node and can be changed flexibly according to

11、the need. Lastly, the delay time of signal transmission can be ensured. The highest transfer rate can reach up to 20kb/s and its largest bus length is 40m.Message Frame Structure：The formation of message frame from LIN bus includes the header and the response. The header is made up of interrupt, syn

12、chronization and protected identifier. The response consists of data field and check sum, of which the data field includes one to eight data bytes. All the other fields in the message frame except interrupt follow the byte and can be generated by the serial communication interface of microcontroller

13、.Hardware design and achievementThis design uses the microchip MC9S08DZ60 as the main chip and is powered by the MC3388. The main chip connects with the wiper controller MC33486 through I/O ports to control the rotating direction and speed of the wiper electric machine. The sensor KM241 as the detec

14、ting device of wiper machine gets its speed and position and sends to the microcontroller by AD ports. Meanwhile, it communicates with rainfall monitoring device and MCU module through the LIN controller MC336613. The overall circuit is shown in Figure 2.Fig.2 The overall schematic of intelligent ca

15、r wiperMCU module：As shown in Figure 2, we select the Freescale chip MC9S08DZ60 as the microcontroller. It is 8-bit microchip in higher integration and powerful function specially designed for the automobile field, providing the Freescale embedded CAN, EEPROM and on-chip emulation/debug module in th

16、e lowest cost. The chip has an internal flash memory of 60K, RAM memory of 2K and E2PROM memory of 1K. MC9S08DZ60 can communicate with peripheral intelligent chip using SPI module of which the SCI module can achieve the LIN bus communication4.Power module：The power module is the device that provides

17、 voltage conversion to wiper controller. The voltage of power supply in the car battery is 12V DC while the MCU, LIN transceiver and Hall sensor are the power supply device in 5V, therefore, the power module needs to convert 12V to 5V and supply to them.The chip MC33889：is selected for the power man

18、agement. It can work in the car ultimate application range of -40 to 125 with CAN physical layer and voltage stabilization. It has internal watchdog timer and local wake-up circuit providing MCU a stable 5V operating voltage. In addition, its integrated design reduces packaging cost and increases th

19、e design flexibility.Wiper electric module：Wiper electric module works with the PWM output by microcontroller going with intelligent power components to adjust the speed of electric machine and drive the forward and reverse rotation of wiper machine. Moreover, it can make appropriate response to the

20、 condition whether the machine was blocked.Wiper control module adopts MC33486 to be the controller of which the stable output is up to 10A, especially meeting the control requirements in positive and inverse phase demanding high power and impact current such as the electric window machine, wiper ma

21、chine and so on. In the regulation for wiper machine, two different power output modules respectively control the coil of wiper electric machine in high and low speed.Detecting device for wiper machine：Intelligent car wiper need to make real-time monitor and control to wiper rotation so that its nec

22、essary to monitor the status of wiper machine such as position , speed, temperature and so on. The system selects the Hall sensor KMZ41 to work with the microchip so that the angle signal within the range of 180 can be measured. After detecting the position of wiper machine, the microcontroller will

23、 determine whether current position is correct. If not, it makes the electric machine rotate to the correct position. Then, after detecting its speed, the single-chip receives the number and compares it to given value to make wiper machine run in the most accurate speed.Software design and achieveme

24、ntIn this design, we use software simulation to achieve the intermittent operation of wiper machine. Timing 3s by the system timer, the MCU outputs chip selection signals of wiper machine to MC33486. Then, the gear judge is entered and the corresponding switch variables are read to carry out the wip

25、er operation.Software design of wiper machine：When the microcontroller detects the condition that wiper switch is pressed, it will judge the gear and enable MC33486 to complete the corresponding wiper control operations according to different gears. First, it determines the gear and carries out erro

26、r detection as well as marking the error counting variable. If everything is normal, the appropriate action will be taken. The total flow of software design is shown in Figure 3.Fig.3 The total flow chart of software design for wiper machineLIN drive and software design of the wiper system：According

27、 to the LIN 2.X specification, the master control node sends LIN messages and the slave nodes feedback them. Only when receiving the query frame from the master node could the slave node send feedback frame to the master node.LIN communication need to configure two files: .id and .cfg. The .id file

28、defines the ID settings, including the receiving and sending direction of ID and frame length. The .cfg document mainly defines the baud rate, clock, and bit time of SCI communication. Configured with these two files, the register definition in regs.h” file need to be modified to enable the register

29、 address to correctly map on DZ60 and set the interrupt vector.After configuring the above conditions, the data sending can be achieved by the steps shown in Figure 4. Figure 5 is the flow chart of data receiving in the master node. To the slave node, the LIN_MsgStatus (MsgId) should be called and d

30、etermine whether the data under ID is LIN_OK. If there is data, the ID data in the buffer can be transferred to *data which is defined by user by calling LIN_GetMsg (MsgId , *data).Fig.5 Data reception flowchart of master nodeFig.4 Data sendingConclusionContrary to the disadvantages of the existing

31、wiper control system, the text proposes an intelligent car wiper control system based on LIN bus. It can control the speed of wiper machine based on rainfall information and achieve the communication between wiper controller and ECU through the LIN bus, making the wiper intelligent. In addition, the

32、 extensive application of LIN bus in the automobile field encourages more devices supporting LIN protocol to be produced. After doing some modifications to MC9S08DZ60, the system can achieve the data transmission with other automobile devices, increasing the design flexibility.AcknowledgmentThis paper is supported by Tianjin Social Development key Foundation of China (NO. 09ZCGYSF00300) and Tianjin Key Laboratory for Control Theory and Application in Complicated Systems, Tianjin University of Technology, Tianjin 300384, China.References1