Research on Electronic Control System of a New-type CVT

In order to abstain from expensive and complicated hydraulic or electric-hydraulic transmission devices, moreover to reduce the oil consumption and improve power performance further, a new type of dry hybrid belt continuously variable transmission (A-CVT)'s structure and work principle are introduced in this paper. The electronic control unit (TCU) has been developed, and the theoretical foundation of optimal speed ratio control of CVT is discussed profoundly. The speed ratio actuator motor is controlled through the method of PID fuzzy controller and non-linear voltage compensation. Through testing with the sample car, which is equipped with the developed TCU, when running at speed of 62.35 Km/h, the oil consumption is 5.64 L per 100 Km and the accelerating time is 22 s while up to 100 Km/h; by comparison, the oil consumption and accelerating time are 5.68 L and 23 s with original TCU in the same situation. The long-term tryout results indicate that the performance of our experimental car comes up to that of archetypal car on the whole. It has fine oil economy and power performance.