Research Of Fault Dlagnosis And Net Communication Of Continuously Variable Transmission Control Unit

The electric control of car has brought about the new problems. On the one hand, it brings more and more difficulties to the maintenance man. On the other hand, the manufacture fault of the electric control system causes the control losing problems. Aiming at the above problems, it's essential to equip the electric control system with the device which can test and monitor faults. Thus, the driving becomes safe and the maintaining becomes simple.It's easy to realize the comfortable driving performance, economic oil wasting and power performance when acceleration. While the performance of the CVT car is determined by TCU (transmission control unit), which is the control unit of CVT. Therefore, the performance of comfort, economy and power is greatly related to the performance of TCU. The faults of signals that entered TCU and of its own will bring hidden trouble to driving. It's obviously important to develop fault diagnosis system of TCU.The fault diagnosis system consists several parts: the real-time diagnosis system of TCU that based on CVT. The diagnosis test-bed system that aiming TCU itself, The interface that communicate with other computers .the applying software based on PC of CVT fault diagnosis system.Faults diagnostic parts on the circuit board of TCU can judge all kinds of faults, different processing modes according to different type faults, finally save different faults code into memorize of diagnostic system of CVT use corresponding apparatus to read and then provide garage men with gist for later performance.The test-bed of TCU hardware circuit simulates all kinds of input signals of its control unit and states of all signals when the car is running. Test the performance of the TCU hardware circuit. The self-fault diagnosis net system consists of CAN and LIN bus systems which complies with the ISO9141 (the requirement of the road diagnosis towards the digital exchange) the two kinds of buses cooperate with each other and either is necessary.All kinds of main controlling computer software cooperate with the whole fault diagnosis system, which may control, record and dispose the faults of electronic parts and mechanic parts systematically, protect the driver and provide gist with the later maintenance.