| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve a problem that a specified responsiveness cannot be obtained due to inter-machine difference of a VNT main body, a negative pressure actuator and an EVRV or the like, and a measured PIM may greatly overshoot in a VNT control system. <P>SOLUTION: When an overshoot value of the measured PIM in regard to a target PIM exceeds a specified value (for example, -20kPa), feedback gain (P, I, D gains kp, ki, kd) calculated by each gain table 3, 3, 5 is multiplied by a correction coefficient (for example, 0.95) smaller than 1 from next calculation, and changed to a small value. Consequently, when a case that cannot obtain the specified responsiveness is occurred due to the inter-machine difference of the VNT main body, the negative pressure actuator, and the EVRV or the like, and the measured PIM overshoots the specified value at one time, overshooting of the measured PIM is suppressed from the next time, thereby the reliability of the VNT control system is improved. <P>COPYRIGHT: (C)2004,JPO</p> |
