设计了一种基于BOOST电路的驱动电路，该电路在喷油器驱动过程中，利用喷油器电磁阀电感上调制的振荡电流对驱动高压源充电，快速补充驱动高压源驱动过程中损失的能量；该电路采用了一种阈值灵活设定的电流调理电路以及高端电流采样电路，很容易实现振荡电流峰值和谷值的调制；理论分析了振荡电流峰值和谷值对驱动电路充电效率的影响，并通过试验验证了该新型电路的有效性以及振荡电流峰值和谷值的优化试验方法。应用该电路可以确保每次喷射时驱动高压的一致性，有效支持多次喷射，满足发动机复杂控制策略的需求；也可以简化大型柴油机电控单元中BOOST模块的设计，降低电感技术参数的要求；还可以缩小PCB板的面积，降低电控单元的设计成本。
A driving circuit based on boost circuit was designed. In the driving process of injector, the oscillating current modulated by the solenoid valve inductance of injector was used to charge the driving high-voltage source and the consumed energy in the driving process was quickly supplemented. The circuit adopted a current adapting circuit with flexible threshold setting and a highend current sampling circuit, which was easy to realize the modulation of peak and valley values for the oscillating current. Then the influences of peak and valley values on the charging efficiency of driving circuit were theoretically analyzed. The effectiveness of newdesigned circuit and the experimental method of optimizing the two values were finally verified. Accordingly, the circuit could ensure the consistency of driving high pressure, especially for multiple injections, which met the requirements of engine complex control strategy. Besides, it could not only simplify the design of boost module in the electronic control unit of complicated diesel engine and hence reduce the requirements of inductance technical parameters but also reduce the area of PCB and hence the design cost of ECU.
