Throttle valve controller which controls a throttle valve of an engine by an electronically controlled actuator.

A throttle valve (2) is opened and closed by the linear motion transmitted by the drive force converter mechanism (70).

Disclosed is an inductance-type contactless rotation angle detection device for use in motor-driven throttle valve devices.

A butterfly valve disposed in an air passage is moved between a first open position and second closed position in a controlled fashion to prevent the build up un-burnt fuel in the event of the activation of the valve.

A butterfly valve or other means of increasing the sampling pressure may be placed in the exhaust pipe at least three 3 D downstream from the sampling probe.

The butterfly valve then controls the amount of air that enters the carburetor, thus, signaling how much fuel will be needed by the engine.

A throttle valve (4) or a fuel injection control governor is subjected to feedback control by referring to this environmental influence quantity in order to improve the response.

Depending on the characteristics of the opacimeter, control of sample pressure can be achieved by a fixed restriction or butterfly valve in the exhaust pipe or extension pipe.