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真空执行器大量应用于EGR与VNT系统,为改善空气系统控制效果,开发了一种VNT与EGR的综合控制算法。该文在分析空气系统排放特性后,提出了空气系统的控制目标。对空气系统特性的实验表明,受空行程与摩擦阻力的影响,该类执行器具有明显的滞回特性与延迟特性,因此,空气系统采用了反馈与前馈控制。实验结果表明,空气系统响应时间显著缩短,并具有良好的稳态控制效果。该控制算法能很好地实现对控制目标的精确控制,为该类系统的商业化应用奠定了基础。
A large number of vacuum actuators are used in EGR and VNT systems. In order to improve the air system control effect, a comprehensive control algorithm of VNT and EGR has been developed. After analyzing the characteristics of air system emissions, this paper proposes the control objectives of air system. Experiments on the characteristics of air system show that this type of actuator has obvious hysteresis characteristics and delay characteristics under the influence of space travel and frictional resistance. Therefore, the air system uses feedback and feedforward control. The experimental results show that the air system response time is significantly shortened, and has good steady-state control effect. The control algorithm can well control the target accurately and lay the foundation for the commercial application of this kind of system.