车辆起步过程发动机恒转速自适应模糊控制研究

Research on Self-adaptive Fuzzy Control for Keeping Engine Speed Constant During Vehicle Starting

车辆起步发动机恒转速控制是一种有效的起步控制策略,如何实现发动机转速跟随目标转速曲线变化以提高起步性能是一个难点。针对这一问题,制定了离合器接合控制原则,设计了以发动机转速及其目标转速、离合器行程为控制参数的自适应模糊控制及相应协调规则构成的控制系统。仿真试验表明在不同工况下该控制策略均能保证发动机基本无超调地达到目标转速,实现了发动机恒转速起步,离合器滑摩功小,能够反映驾驶员起步意图,提高了车辆起步性能。

Keeping engine speed constant during vehicle starting is an effective control method, but how to make engine speed vary with the target speed curve so as to improve starting quality is a difficult issue. To solve the problem, a new clutch control principle was proposed, and a control system comprised of a self-adaptive fuzzy controller constructed by engine speed and its target speed and clutch displacement and rule harmonizing controller was devised. The simulation experiment show that engine can reach its target speed with little overshot under diversiform situation and vehicle starts successfully with constant engine speed and small friction loss as well. The start quality is proved to be improved through applying the strategy.