Synthetical Ramp Shift Strategy on Electric Vehicle with AMT

The performance of the drive motor system was better with AMT system. A synthetical ramp shift strategy that identified the riding condition based on rotational speed of the drive motor before and after the shifting process has been provided. The ramp shift test on one the electric truck with AMT was done, and the test results showed that by dropping gear continuously or discontinuously, the proper gear could be found eventually when the vehicle was running on ramp, though the original gear might be improper.