The AMT Measurement, Calibration And Diagnosis System

With the development of AMT (Automated Mechanical Transmission) technology and its usage widely, there are more and more requirements about the AMT ECU(Electronic Control Unit)'s system, the time of its development, the precision of controlling. There are three phrases in the development of ECU, the hardware, the software and the calibration of the ECU and AMT. The calibration is the procedure of adjusting and optimizing the parameters of the ECU. The calibration system is the communication tool between the calibratior and ECU. The calibratior can read the data from the ECU by the calibrate tool, and display them on the interface. Doing so, the calibrator can analysis and edit the data and then send them back to the ECU by the communication interface. The AMT adopts the microcomputer technology based on the manual AMT and controls it highly active and low cost. During the procedure of running, the micro computer measures the parameters of the vehicle, acquires the best shift according to the switching rule, completes the switching by controlling the engine, clutch, transmission. It retains the excellence of manual drive transmission and has the merit of manipulating simply. At the same time, with its high electronic and complex configuration, if there is an error in the components or the lead and pin gets lose and poor contact, the whole system will has an error. Because the system is complex, it is very hard to for the maintainer to repair it. So it is very necessarily to work out a diagnosis system. The calibration system can change the calibration parameters on line. The diagnosis system can find the code of mistake during the vehicle running and clear it. The two systems are both useful to the development of AMT. The calibration system can edit and change the parameters online in order to get the best rule of switching. The diagnosis system can find the faults in the running of the AMT and clear them. The two systems guarantee the development of AMT from the beginning to the end. So they are the necessary tools for the development of AMT. To meet the requirement of the project, we design the AMT measurement calibration and diagnosis system. With the calibration system, we can edit and change the parameters in the AMT ECU online and inspect them real-timely. With the diagnosis system, we can read the codes of the faults which come out during the development of the AMT. The main functions of the system are as follow: 1. Edit and modify the parameters in the AMT ECU; 2. Measuring the parameters of the AMT ECU and the vehicle real time; 3. Read the code of faults from the AMT ECU and clear them; 4. Read the data from the AMT ECU and send them to the maintainer; Above 1 and 2 belong to the calibration system, the other two belong to the diagnosis system. The thesis completes the general design of the calibration system, including the function requirement of calibration interface, the communication and the flue of the communication of the AMT ECU; designs the hardware and software of the diagnosis system in detail, including the diagnostic instrument ECU's main controller, CAN(Controller Area Network) communication, the keyboard and screen design. The thesis makes use of assembly language of 80C196KC to complete the functions of the system. The thesis is divided into totally 6 chapters, which can be summarized into three parts: Part 1: Chapter 1.Totally introduces the concept, theory and their development of AMT and its calibration and diagnosis. Because the technique of the system is a typical application system of SCM,therefore, in this chapter we introduce the control system of SCM in detail. Part 2: Chapter 2.Intrduce the general design of the calibration system. This chapter makes use for reference of the technology of calibration now to design calibration system aimed at AMT. The system can be divided into two parts: the top part and the bottom part. The thesis design the generalconfiguration of the top part, abort the USB-to-CAN to complete the CAN communication between the PC computer and the AMT ECU. In the top part, design the general function of the calibration interface. The system abort the CAN Calibration Protocol which is designed for measure and calibrate. In the bottom part, the main work is to drive the CAN Calibration Protocol and the CAN controller and complete the flow of the communication. Part 3: Chapter 3 and chapter 4.The two chapters design the hardware and software of the top part of the diagnosis system in detail. The circuit of the system is divided into 3 parts: the main plank electric circuit, the CAN communication circuit and the keyboard and LCD circuit. The SCM P80C196KC is the central of the main plank electric circuit. Because of the complexity of the system, the SCM internal function unit, such as the capacity of ROM, RAM, I/O etc, can't satisfy the request of the system, thus it needs to expand outside slice and select the appropriate slice and design the homologous electric circuit. We select 28C256 and 6264 as the expand ROM and RAM. The part of the CAN communication selects the SJA1000 as the independent CAN controller, the 82C250 as the bus drive, and the 6N137 for electrical protection. According to the item requirements, we select C10264-3 as the display device. The software of the system includes the main control program, the initialization program, the protocol execution program, the CAN breaking program, the LCD drive program and the words displayed program. The initialization program includes the initialization for the timer and the CAN controller. The system adopts the software timer0 as the timer which breaks every 10ms during which the main control program will check the conditions of the protocol's execution. The initialization of the independent CAN controller is to set some registers. In this system, the SJA1000 work as the mode of PeliCAN. The CAN break program includes receiving data, sending data and solving the error. The style of solving the error adopts the breaking. The execution of the protocol is to complete four functions: read the ID of the...