| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method and device for controlling pressure, wherein the performance for controlling the pressure in a pressure accumulator chamber is never degraded even in the event of occurrence of disturbance by estimating the disturbance pressure affecting the pressure accumulator chamber (common rail) that composes a pressure accumulation type fuel injector in use for a diesel engine and the like by means of the observer control and by correcting a pump discharge instruction using a compensation value for compensating the estimated disturbance pressure. <P>SOLUTION: This method for controlling pressure in a pressure accumulator chamber is provided with a feedback control section 42 calculating the pump discharge instruction value of a fuel pump based on pressure difference between target pressure of the pressure accumulator chamber and actual pressure accumulator chamber pressure detected by a fuel pressure sensor 46, and a disturbance observer control section 44 numerically modeling a pump delivery command value to the fuel pump, disturbance pressure acting on the pressure accumulator chamber, and pressure accumulator chamber pressure with using a transfer function of the fuel pump, estimating the disturbance pressure from the numerical model, and leading out the compensation value for compensating the disturbance. The output from the feedback control section 42 is corrected by the disturbance compensation value from the disturbance observer control section 44. <P>COPYRIGHT: (C)2009,JPO&INPIT |
