| 摘要 |
PURPOSE:To realize a control method where control convergence is quick and hunting is less by switching the control state with the time lag of a prescribed time when a controlled variable is shifted from a high gain control region to a low gain control region. CONSTITUTION:When the controlled variable is shifted from the high gain control region to the low gain control region, the control state is switched with the time lag of a prescribed time; and when the controlled variable is shifted from the low gain control region to the high gain control region, the control state is switched immediately. For example, the detection signal of height to ground from an ultrasonic sensor 1 is inputted to an operating part 7 of a controller 3 of a combine through an input interface 5, and the difference between this signal and a preliminarily set target value is operated as the controlled variable. The control mode is set to the low gain control region if this controlled variable is within a prescribed range of height to ground; and the control mode is set to the high gain control region if the controlled variable is outside said range, and a control signal is sent to a solenoid valve 6 through an output interface 4. |
