Authors: X Y Fan L Liu S Q Chang J T Xu J G Dai
Publish Date: 2016/04/30
Volume: 17, Issue: 3, Pages: 361-367
Abstract
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
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