| 摘要 |
PURPOSE:To control the rotating speed with a small constant deviation and a short settling time by controlling the feed air quantity to an engine based on the deviation signal between the engine rotating speed and target rotating speed and on the discrimination signal of the increase or decrease of the engine rotating speed by time. CONSTITUTION:The rotating speed is detected from the output of a rotating speed sensor 2 detecting the rotating speed of an internal-combustion engine by means of a rotating speed detection circuit 3, and the detected rotating speed is averaged by an averaging circuit 4. The average rotating speed is compared with the target rotating speed from a setting circuit 5 by a differential amplifier circuit 6 to generate a difference signal. In addition, the average rotating speed is fed to a rotating speed increase/decrease discriminating circuit 7 so as to discriminate whether the rotating speed is in an increasing tendency or decreasing tendency. The outputs of both circuit 6, 7 are fed to a calculating circuit 8 to generate a control action signal, by which an actuator 10 is operated through a driving circuit 9, thus controlling an air quantity adjusting device such as a throttle valve to adjust the feed air quantity. |
