Engine Solenoid Driven Valve Train Control Technology Research

In the field of automobile Variable Valve Timing and Lift is identified as the most advanced technology to developing the next-generation engine, it must has an important impact on the development of internal combustion engines. Engine's electromagnetic valve actuation is one kind of variable valve actuations, which is of great potential benefits. Electromagnetic valve actuation belongs to cam-less variable valve actuations. By comparison with variable valve technique based to camshaft, EVA has such specific advantages as full control of valve timing, simplifying engine structure, and disabling some cylinders at low load, which can improve power performance, fuel economy and reduce exhaust emission significantly. Quite a lot of research work on "dual spring and dual coil" variable valve actuation has been conducted by Aura System corporation, Ford corporation, FEV corporation and GM corporation abroad and some famous universities. One of the main obstacles for its commercialization is the valve-seat impact, which is called "soft lading" problem. So far no control scheme has completely and wonderfully solved the problem yet. This thesis focus on the control technology of engine's electromagnetic actuated valve train (EAVT) coupled with multi-force.In this thesis, the configuration of EAVT system was introduced and the related parameters of coil were got by counting and measuring. Through the analysis of EAVT system, a coupling system model was developed from three points of view:dynamics, electric and magnetic field. The related parameters in the model were measured by experiments. Based on the model of EAVT system, the system functions was linearized exactly in the whole process and linearized approximately at the work point as the research basic of control strategy. Then a PID controller was designed by the method of root locus. The optimal controller was designed on optimal control theory. The simulation result of feedback control show that PID control and optimal control maybe are suitable for the control of EAVT system. At last the dynamic experiments were conducted based on the hardware platform developed by myself. The results of the tests prove that the control strategy is available.