Abstract: When an accelerator drum of a throttle valve control apparatus is turned in a valve opening direction to open a throttle valve, an electric motor is energized to turn a rotatable shaft thereof through a predetermined angle, causing a valve shaft to turn the throttle valve in the valve opening direction. The angular movement of the throttle valve is transmitted from a valve shaft lever through a link to an intermediate lever, whose first engaging finger is angularly moved in the valve opening direction relatively to a second engaging finger of the accelerator drum. The throttle valve control apparatus allows the throttle valve to be controlled with an accelerator pedal and the electric motor. The throttle valve control apparatus is relatively simple in structure, can be designed with increased layout freedom, and can perform both a fail-safe function and a limping-home function.

Abstract: A pedal side drive mechanism which is rotatable relative to a throttle shaft in both opening and closing directions is provided at one end of the throttle shaft. The throttle shaft opens and closes a throttle valve. A motor side drive mechanism, which is rotatable relative to the throttle shaft in both opening and closing directions, is provided at the other end of the throttle shaft. The pedal side drive mechanism and the motor side drive mechanism are able to be driven independently without interfering with each other, in both of the opening and closing directions of the throttle shaft. Accordingly, driving of the throttle can be performed using either the accelerator pedal or the motor, and functions including fail-safe measures or a limp home mode can be accomplished using a simple structure.

Abstract: A throttle drum with a first return spring disposed therearound is rotatably mounted on a throttle shaft, and a cruise control drum with a second return spring disposed therearound is rotatably disposed around the throttle drum. The throttle drum and the cruise control drum are arranged in a radially double-walled structure around the throttle shaft, which may be of a relatively short axial length.

Abstract: When an armature is displaced by application of a voltage to an electromagnetic coil, a second elastic member contracts in opposition to the restorative force of the second elastic member, wherein a washer, the second elastic member, and the armature are displaced integrally. The armature abuts against the washer, and thereafter a first elastic member is compressed in a direction to close the valve, the first elastic member being compressed in opposition to its restorative force, whereby a main valve body is separated from a valve seat. As a result, exhaust gas is introduced through an inlet port and communicates with an outlet port.