Patent ID: 6701892
Filing Date: 2004-03-09
Classification: F02D,F16K,G01D

Abstract:
A throttle valve control apparatus of an internal combustion engine comprising:a throttle body provided with a throttle valve controlling an amount of intake air; a throttle sensor detecting a rotational angle of a shaft to which said throttle valve is mounted; and a motor-driven actuator in which a command value is adjusted in accordance with an electric signal output from said throttle sensor, wherein said throttle sensor comprises: an element mounted to one end of said throttle valve shaft; another element attached to a cover member fixed to said throttle body so as to cover the axial end portion, a gear fixed to the same side as said shaft together with the magnet corresponding to said element and used for transmitting rotation torque of said motor to said shaft, said gear being provided with a non-magnetic tooth portion formed in an angle of approach smaller than 360 degrees, wherein said cover covers said gear and holds the Hall element corresponding to said another element, and a positional relation between the tooth portion of said gear and said Hall element is changed asymmetrically with the rotational direction based on the rotational position of said shaft, a magnetic physical amount between said pair of elements is varied in accordance with a change of the rotational angle of said throttle valve shaft, and the element mounted to said cover member outputs an electric signal relating to the rotational angle of said shaft in response to the change of said magnetic physical amount.