Second-order sliding mode control of the engine speed for an automated manual transmission during gear shifting process

An effective engine speed control brings an obvious improvement to the automated manual transmission (AMT) shift quality during gear shifting process. In this paper a second-order sliding mode control with the super twisting algorithm is applied. This control method has a better tracking performance and a stronger robustness to a nonlinear uncertainty system. The comparison results show that this advanced closed loop control has huge advantages in comparison to conventional controls such as PI control and open control. The overshoot and steady-state error are separately reduced and prevented under all engine conditions, AMT shift quality is improved.