摘要：Gas fuel injection device (GFID) has a great influence on the performance of compressed natural gas engine. A novel large-flow-rate GFID with simplified sensorless control strategy was proposed in this paper, which adopts a moving-coil electromagnetic linear actuator as driver, and utilizes a plastic gasket to improve the sealing performance. The actuator’s actuating force was maximized and linearized utilizing Halbach magnet array and two sets of coils with opposite current. Meanwhile, a landing control strategy based on energy distribution was presented to eliminate bounce and excessive compression while maintaining fast response. The sensorless landing control strategy was simplified according to the features of the actuator. Position detection was carried out to monitor landing process. PD mode iterative learning control was used to adjust distribution point. The results showed that the landing velocity was decreased by 58.5% under rated condition with the proposed control strategy. The bounce and excessive compression of plastic gasket were eliminated with the transition time of 1.8 ms. Consequently, the fuel injection quantity can be controlled precisely and timely.
关键词：Electromagnetic linear actuator; gas fuel injection device; dynamic performance; sensorless control
