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In recent years, with the improvement of engine technology, the adjustable structure among engine systems has become more and more complex, especially in the transient state, the change of adjustable system state will have a certain impact on the normal operation of the engine. In order to optimize the comprehensive performance of the engine, it is necessary to study the control coupling between multiple adjustable systems, Therefore, it is important to study the characteristics of actuator and its hysteresis coupling law under transient conditions of adjustable system, as well as the influence of transient process on engine performance. This paper mainly studies the coupling relationship between variable supercharging system and variable valve system of marine medium speed diesel engine, and its transient influence on diesel engine performance parameters. To complete this research, the medium speed diesel engine model is established by using GT power software, and the models of speed, air braking proportional distribution valve (ABP) and intake phase controller are established by Matlab / Simulink software. Through the matching of the signal relationship between the two softwares, the joint simulation of GT power and Matlab / Simulink is realized. After the model is established, the performance parameter curves of the diesel engine are obtained by switching the opening and closing state of the actuator ABP in the variable supercharging system and adjusting the intake phase in the variable valve distribution system. The simulation results show that in the process of opening and closing state switching of ABP, the fuel steam matching is uncoordinated due to the influence of hysteresis, which leads to sudden change of speed and change of fuel consumption. In addition, the change of intake phase will appropriately improve the sudden change of speed caused by ABP hysteresis, and it will also have a certain impact on the economy.
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