CNG发动机双线圈点火系统放电特性仿真研究

Discharge Characteristics Simulation of Dual-coil Ignition System for CNG Engine

设计了双线圈点火系统次级电压仿真电路和点火能量仿真电路。在两个初级线圈充电时间不变的条件下,利用仿真方法,通过改变两线圈放电开始时间间隔,研究了双线圈放电点火系统次级电压和点火能量变化规律。结果表明,与单线圈点火系统相比,在不同放电开始时间间隔的条件下,双线圈点火系统能够有效提升点火能量,提高次级电压及次级电压升高率,增加火花持续时间,并能够实现多次放电,为CNG发动机可调放电点火系统的设计与控制提供理论依据。

The simulation circuits of secondary voltage and ignition energy were designed for a dual-coil ignition system. Un- der the same charging of two primary coils, the secondary voltage and ignition energy of the dual-coil ignition system were stud- ied by changing the discharge interval of two coils. The results show that, compared with the single-coil ignition system, the dual-coil ignition system can enhance the ignition energy effectively, boost the secondary voltage and its rise rate, increase the spark duration and achieve the multiple discharges under different discharge intervals, which provides the theoretical basis for the design and control of CNG engine variable discharge ignition system.