| 摘要 |
PURPOSE:To reduce fatigue in accelerator operation by weakening a return spring by connecting a drive unit to a throttle valve and by closing the throttle valve forcedly from the vicinity to full closing at the time of releasing of depressing of an accelerator pedal. CONSTITUTION:A follower cam 2 is connected to a rotary shaft 11 of a throttle valve 1 of intake passages 20A, 20B and a diaphragm device 4 of intake nega tive pressure is connected to the follower cam 2 via a lever 3. An accelerator pedal switch 10 is provided on a accelerator pedal 9 and when depressing of the accelerator pedal 9 is released, a solenoid valve 6 is electrified to close an atmospheric pressure introduction path 7, and intake negative pressure is introduced from a negative pressure introduction path 8 into a negative pressure chamber 18 and the diaphragm device 4 rotates the follower cam 2 to the count er clockwise direction via the lever 3 to close a throttle valve 1 forcedly. Then, energizing force of a return spring of the throttle valve 1 becomes unnecessary almost near the full closing position, and accelerator operating force can be reduced. |
