| 摘要 |
PROBLEM TO BE SOLVED: To allow a vehicle to travel safely by operating a throttle valve to open/close mechanically between total closure and set maximum opening at the occurrence of abnormality or failure in an electronic control system. SOLUTION: An electronic control system electronically opens/closes the throttle valve 4 by transmitting free rotation to a throttle valve stem 3 of an actuator lever 16 driven by an actuator 9, through a throttle valve stem lever 17 rotated integrally with the throttle valve stem 3 and movable in an axial direction. At the occurrence of abnormality or failure in the electronic control system, an auxiliary actuator 25 is operated to move a linear moving output shaft 29. The throttle valve stem lever 17 is thereby moved in the axial direction and separated from the actuator lever 16. The throttle valve 4 is closed by a throttle valve return spring 6 and then rotated from the closed position by the engagement of a cam face 30A of a lever guide 30 with an operating lever 8 stuck to the throttle valve stem 3. The throttle valve 4 is thereby operated to open/close mechanically according to the stroke of the linear moving output shaft 29. COPYRIGHT: (C)2005,JPO&NCIPI |
