| 摘要 |
PROBLEM TO BE SOLVED: To reduce the burden of driving a throttle actuator and stabilize a control action of a throttle, by improving characteristics (improvement in spring characteristic of a return spring or the like) of a throttle device having an initial opening setting mechanism. SOLUTION: The throttle device has the initial opening setting mechanism for keeping initial opening of a throttle valve 24 to be larger than a full close position when the current is not applied to a motor 12 of the throttle device. The throttle device has an energizing means 4 energizing the throttle valve to a closing direction in an opening region larger than the position of an initial opening setting stopper, and an energizing means 5 energizing the throttle valve 24 to an opening direction to maintain the initial opening in a vicinity of the full close position. A shaft torque T1 applied to a throttle valve closing direction at the position of the initial opening setting stopper by the energizing means 4, and a shaft torque T2 applied to a throttle valve opening direction by the energizing means 5, satisfy the following expressions: T1≥Mf×Ge+Vf, and T2≤Mf×Ge+Vf (where, Mf is motor static friction torque, Ge is a deceleration rate, and Vf is torque required on the throttle shaft to open the throttle valve). COPYRIGHT: (C)2005,JPO&NCIPI |
