Development Of DCT Control Software

Dual clutch transmission which is based on the existent lay shaft MT manufacture technique, inherits many advantages of the manual transmission such as high transmission efficiency, compact package space, and low cost . DCT also overcomes the shortcoming of power interruption in traditional AMT shifting. Current transmission production facilities can be available for saving cost, so many transmission manufacturers focus on DCT, and has good development future. DCT transmission stalls divided into odd and even gear, with two clutches connected, in the process of shifting, through two clutch engaging and disengaging control, dynamic shift can be achieved to enhance the momentum of the vehicles, economy and comfort. Automatic transmission system control software is the core of electronic control system. The vehicle dynamic, economic performance and comfort are effected by its performance. The dual-clutch automatic transmission software system is developed by this paper. Key elements include:â‘ The engine performances are researched according to the measurement of engine test data. According to two-parameter shift law, the dynamic and economic shift laws of CV11 are developed. According to target-constant-speed control principle, start-up strategy is developed.â‘¡The DCT control system structure is researched. Based on the hydraulic acuator principle, the relevent acuator control subsystems are established.â‘¢According to P, R, N and D gears, control models are established and control flows are also made. The realizations of the rules are founded in Simulink.The software test system is developed.â‘£The interface of control system is developed. Acuator, start-up and shift test scheme of DCT is developed.By using CCS, the programs are written into TCU. Startup and shift experiment are done by CCS. By using host computer and low computer serial port communication of measurement and control system, it is showed that the data which transmit from low computer to host computer, and send out instructions to control actuators through host computer.