Electromagnetic valve train for gasoline engine exhaust system

  • X. Y. Fan
  • L. Liu
  • S. Q. Chang
  • J. T. Xu
  • J. G. Dai


Electromagnetic valve train (EMVT) in camless engine offers large potential for both part load fuel economy and high load engine torque. However, it is more difficult to be applied on exhaust system than intake system. Because the gas pressure brings high demands for driving force, especially at high engine speed and full load. Based on the working characters of actuator, a method by increasing the transient currents in windings during valve’s opening motion is suggested to overcome the gas pressure. But this will cause more energy losses and heat. In order to make the EMVT used on exhaust system better, quantitative analysis is carried out against the additional power consumption caused by gas pressure under different conditions. Furthermore, an approach is introduced to define the optimal exhaust valve opening motion at full load conditions. It aims at making a better compromise between the engine power output and exhaust valves’ power consumption, thus both the efficiency of EMVT and engine performance are enhanced.

Key words

Camless engine Electromagnetic valve train Exhaust system Gas pressure Power consumption 



electromagnetic valve train


exhaust valve opening


exhaust valve closing


crank angle


after top dead center


bottom dead center


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Copyright information

© The Korean Society of Automotive Engineers and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • X. Y. Fan
    • 1
  • L. Liu
    • 1
  • S. Q. Chang
    • 1
  • J. T. Xu
    • 1
    • 2
  • J. G. Dai
    • 1
  1. 1.School of Mechanical EngineeringNanjing University of Science and TechnologyNanjingChina
  2. 2.School of Mechanical EngineeringNanjing Institute of Industry TechnologyNanjingChina

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