Research On Speed Control Of Diesel Engine With The Sliding Mode Variable Structure Theory

The traditional PID algorithm is a linear control algorithm.The PID algorithm is not the most suitable control strategy for the diesel engine which has typical nonlinear and time-varying characteristics.The more advanced control algorithm is applied to the speed control of diesel engine.In this paper,the slippage variable structure control theory with strong robustness is studied,and the second-order sliding mode super-helix control algorithm is used to design the speed controller of the diesel engine,and the experiment is verified..First of all,this paper focuses on the second order sliding mode control theory and several commonly used algorithms.And the controller model is established by Matlab / Simulink.The simulation results show that the super-helix algorithm can meet the requirements of diesel engine speed regulation in different conditions.In this paper,the control strategy of Cummins high pressure common rail diesel engine is also based on the super-helix algorithm.The control experiment is carried out through the ControlBase platform to verify the designed control strategy and the super-spiral algorithm.The results show that:(1)The designed control strategy can realize the control process of each diesel engine and the control effect is good;(2)The sliding mode control algorithm can realize the control of the speed,and the algorithm has better performance than the PID control algorithm,can better balance the transient steady-state speed control process,proved that the nonlinear control algorithm is more suitable for diesel engine control process.