燃料喷射控制压电阀的驱动控制策略研究. (Chinese)

Study on the Drive Control Strategy of Piezoelectric Valve for Fuel Injection Control. (English)

The response speed of piezoelectric valve in piezoelectric injector determines the performance and accuracy of fuel injection control in internal combustion engines. In order to improve the response speed of piezoelectric valve, a joint simulation model of piezoelectric valve and its drive circuit based on pulse width modulation (PWM) control method was established by MATLAB/Simulink, and a test bench was built to test the performance of piezoelectric valve, and the effect of PWM pulse width and pulse number of injection control signal on the response time of piezoelectric valve was investigated by combining simulation and test. The results show that for the self-researched drive circuit, the PWM pulse width of the injection control signal has an optimal value, and the optimal pulse width is from 0. 3 ms to 0. 42 ms. Under the multi-pulse control strategy, the response times of piezoelectric valve opening and closing are 0. 525 ms and 0. 725 ms respectively; under the single-pulse control strategy, the response times of piezoelectric valve opening and closing are 0. 5 ms and 0. 6 ms respectively, which meet the control requirements for achieving multiple injections in one cycle of an internal combustion engine. Compared with the multi-pulse control strategy, the opening response time of the single-pulse control strategy is shortened by 4. 762%, and the closing response time is shortened by 17. 2%. [ABSTRACT FROM AUTHOR]

压电式喷射器中压电阀的响应速度决定了内燃机燃料喷射控制的性能和精度。为提高压电阀响应速度，针对自主研制的压电阀及其基于脉宽调制（PWM）控制方式的驱动电路，利用MATLAB/Simulink建立两者的联合仿真模型，并搭建压电阀性能测试试验台，通过仿真与试验结合的方式探究喷射控制信号PWM脉宽、脉冲数对压电阀响应时间的影响。结果表明：对自研驱动电路，喷射控制信号PWM脉宽存在最优值，且最优脉宽在0.3~0.42 ms内；多脉冲控制策略下，压电阀开启和关闭响应时间分别为0.525、0.725 ms；单脉冲控制策略下，压电阀开启和关闭响应时间分别为0.5、0.6 ms，均满足内燃机一个循环内实现多次喷射的控制要求；相较于多脉冲控制策略，单脉冲控制策略开启响应时间缩短4.762%，关闭响应时间缩短17.2%。 [ABSTRACT FROM AUTHOR]

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