A Developing Process of Newly Developed Electromagnetic Valve Actuator - Effect of Design and Operating Parameters

Electromagnetic valve (EMV) actuation system is a new technology for the improvement of fuel efficiency and the reduction of emissions in SI engines. It can provide more flexibility in valve event control compared to conventional variable valve actuation devices. However, a more powerful and efficient actuator design is needed for this technology to be applied in mass production engines.

This paper presents the effects of design and operating parameters on the thermal, static and dynamic performances of the actuator. The finite element method (FEM) and computer simulation models are used in predicting the solenoid forces, dynamic characteristics and thermal characteristics of the actuator. Effect of design parameters and operating environment on the actuator performance were verified before making prototypes using the analytical models.

To verify the accuracy of the simulation model, experimental study is also carried out on a prototype actuator. It is found that there is a relatively good agreement between the experimental data and the results from the simulation model. The newly designed actuator is successfully operated on the test bench and firing condition of single cylinder engine. Through the whole speed range, the actuator keeps up the proper performance in the valve timing and event control.