自由活塞式内燃发电机启动过程分析

Analysis of Starting Process in Free-piston Engine-generator

摘要:

针对自由活塞式内燃发电机启动过程中的匹配问题，建立了内燃发电机系统启动过程的数学模型。通过对活塞运动位移及速度的简化，推导出直线电机驱动力简化表达式。研究结果表明：增加内燃发电机的活塞运动组件质量，可以减小直线电机的驱动力，但是活塞组件达到的最大速度减小，不利于高速启动；减小内燃机摩擦阻力系数以及有效压缩比也可以降低直线电机的驱动力。利用该简化公式分析了一台样机的启动过程，获得了该样机所需要的最小驱动力。

Abstract:

In order to solve the matching problem, the mathematic model of starting process of free-piston engine-generator was analyzed. By simplifying the displacement and velocity of the piston, simplified expressions of driving force of linear motor was deduced. The result showed that the larger piston mass could advisably increase inertial force and decrease the minimum starting force, but reduce the maximum speed and slower the starting process. Less frictional coefficient and effective compression ratio could also reduce the starting force. With the simplified formula, the starting process of a prototype free-piston engine-generator was analyzed and the minimum starting force was achieved.