| 摘要 |
PURPOSE:To eliminate the hysteresis of a proportional solenoid, by oscillating the ON-time of DUTY signals applied to the proportional solenoid at all times. CONSTITUTION:A proportional solenoid 3 is provided in a by-pass passage 2 connecting the upstream side and the downstream side of a throttle valve 1. Motion of the proportional solenoid 3 is controlled by DUTY signals 5 supplied from a control unit 4. Here, if ON, DUTY signals are always oscillated, the hysteresis of the proportional solenoid is eliminated. By thus eliminating the hysteresis of the proportional solenoid, it is enabled to obtain an excellent controllability. |
