| 摘要 |
<p>PURPOSE:To improve the accuracy of controlling of a supercharging pressure by selecting an operation region in which proportional control and integral one are executed according to a discriminated result obtained by a discriminating means for the operation region in which feed back control is executed and executing the integral control only in a prescribed operation region having a pressure near to a target supercharging pressure. CONSTITUTION:An intake air quantity is inputted by means of an air flow meter 31, and a solenoid valve is controlled according to the intake air quantity to control a supercharging pressure through an actuator 50 and a movable tongue. A deviation between the supercharging pressure detected by a supercharging pressure sensor 33 and the set point of the target supercharging pressure is obtained by the use of the computing means of deviation 82. A proportional part proportionate to the deviation and an integral part proportionate at an integrated value are computed by the computing means of proportional part 83 and of integral part 84 respectively. A discriminating means 87 closes switches 88, 89 in the case of a supercharging pressure higher than the target one, and closes only the switch 88 in the case of a supercharging pressure lower than the target one. Thus the proportional and integral parts are added by means of adders 85, 86.</p> |
