Electromagnetic valve train (EMVT) can realize independent, real-time and continuous valve motion regulation through the precise motion servo control, which has great potential to improve the efficiency of internal combustion engines. As an electromechanical integration device, EMVT is driven by electric energy, and the loss distribution is complex and changeable under different service conditions. Especially when the EMVT is used in exhaust system, the high gas pressure after combustion will increase the energy loss and operating temperature significantly. In order to improve the device performance, this study analyses the loss distribution and variation law of EMVT under different service conditions. First, the flux density is obtained by the 3D finite element simulation. In combination with the valve train dynamic Matlab/Simulink model, the copper loss and iron loss of EMVT under typical conditions are explored in detail. Then, the influence of the motion parameters (transition time) and condition parameters (gas pressure) on EMVT’s loss are calculated and analyzed significantly. In the end, the accuracy of the loss models and analysis results is verified by the experiment based on linear load simulator.

中文翻译：

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不同工况下电磁气门机构的损耗分析

电磁气门机构（EMVT）通过精确的运动伺服控制可以实现独立，实时和连续的气门运动调节，这在提高内燃机效率方面具有巨大的潜力。作为机电集成设备，EMVT由电能驱动，并且损耗分布复杂且在不同使用条件下会发生变化。尤其是在排气系统中使用EMVT时，燃烧后的高气压会显着增加能量损失和工作温度。为了提高设备性能，本研究分析了不同使用条件下EMVT的损耗分布和变化规律。首先，通过3D有限元模拟获得磁通密度。结合气门机构动态Matlab / Simulink模型，详细探讨了典型条件下EMVT的铜损和铁损。然后，计算并分析了运动参数（过渡时间）和条件参数（气压）对EMVT损失的影响。最后，通过基于线性负载模拟器的实验验证了损失模型和分析结果的准确性。