| 摘要 |
PURPOSE:To reduce operating force for an accelerator pedal, by supplying both first and second throttle valves with hydraulic pressure which produces assist force in the same direction as that of energizing force referring to suction throttle opening. CONSTITUTION:Cut back pressure Pcb out of a cutoff valve 128 is fed to a port 456 of a first throttle valve 112, while second throttle pressure Pth2 is fed to a port 156 of a second throttle valve 140. With this constitution, since such force as assisting operating force for an accelerator pedal will act on each of these first and second throttle valves 112 and 140, the pedal operating force is thus reducible. |
