| 摘要 |
A system and method for controlling pressure within a common rail fluid distribution system use variable gains for a PID and feed forward controller that controls a pump that pressurizes the common rail. The pressure controller implements a combined feedback/feed forward control strategy with variable gains based on engine speed and a fluid quantity. In one embodiment, the feedback control loop includes proportional, integral, and derivative terms with variable gains determined based on pumped fuel quantity and engine speed. Alternatively, the proportional, integral, and derivative gains are determined based on injected fuel quantity per engine cycle and engine speed, or based on pump output, i.e. the product of pumped fluid quantity and engine speed. A variable gain feed forward control has its gain based on pumped fuel per cycle and engine speed, or alternatively based on pump output per unit time.
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