车用电控发动机点火能量测试系统的开发

摘要

The spark energy measurement system was successfully developed for accelerating the development process of the electronic-controlled unit and optimizing the combustion process of the engine. The control and monitor interface communicated with the MCU of ignition module through serial communication port, the operation parameters could be monitored in real time. The speed signal was input to the MCU, and it was adopted as baseline for calculating the ignition advance angle and ignition timing. The transistor was driven by ignition control signal which was output by MCU to control the power on-off of the primary circuit. Reference to SAE J973-1999 standard, a Zener string was introduced as simulation load. The output voltage of secondary coil and current of secondary circuit were acquired, and the output energy of secondary coil could be calculated by the integral of the product of spark voltage and spark current that are varying with time. The output energy of secondary coil was adopted as a standard to evaluate the spark energy. Test results show that, for the ignition module developed for Jl465 Q5, the spark energy can be evaluated effectively and quantitatively.%为了加快车用发动机电控单元的开发,优化发动机的燃烧过程,开发了点火能量测试系统.系统中的试验监控界面通过串口与点火模块中的MCU保持通讯,实时监控系统的运行参数;MCU以输入的转速信号为基准,计算点火提前角和点火正时,输出点火控制信号,并通过晶体管控制初级回路的通断;参照SAE J973-1999标准,采用稳压管串模拟负载,分别采集点火线圈次级输出的电压信号和流经次级回路的电流信号,并对电流和电压信号的乘积进行积分运算,即可得到点火线圈次级输出的能量,以此作为评价点火能量的一个指标.试验结果表明,针对自主开发的JL465Q5发动机电控点火模块,点火能量能被有效的量化评价.