基于加速度的柴油机多回路切换控制策略设计

Multi-Loop Switching Control Strategy Design of Diesel Engine Based on Acceleration

柴油机在不同工况和使用场景下采取的控制策略不同,柴油机的控制逻辑软件架构应具备拓展性——易于添加新工况控制逻辑和修改已有控制策略。在工况发生变化时应保证控制切换过程的平稳。为了达到这一目的,提出一种基于加速度控制的多回路切换策略。该方法以加速度闭环为内核,将不同工况的控制策略统一为外环的加速度请求。通过竞争策略得到目标加速度后进入内环控制柴油机。该方法组织耦合度低,易于增加或修改外环工况控制算法。最后通过发动机台架试验验证:切换过程完成平稳,该切换策略达到设计目的。

Diesel engines adopt different control strategies under different working conditions and scenarios.The design of control strategy architecture should not only be expandable which easy to add new control logic and to modify existing control strategy,but also ensure the smooth switching of control strategy.For this purpose,a multi-loop switching strategy based on acceleration control loop is proposed.The method takes the acceleration closed loop as the core and the control strategy under different conditions is unified as the acceleration request of the outer loop.The target acceleration is obtained by the competitive strategy,and then the fuel supply of the diesel engine is calculated by the inner loop.This control architecture has low coupling degree and it is easy to add or to change the outer loop control algorithm.The engine bench test shows that the switching strategy achieves the design purpose and the switching process is rapid and stable.