Importance

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Abstract

An electronic throttle control apparatus can detect a motor open-circuit failure without detecting a motor current. A throttle opening sensor detects an actual throttle opening position (ATOP) of a throttle valve, and a throttle actuator serves to drive the throttle valve and hold the throttle valve at an intermediate opening stopper position (IOSP) during non-energization of the motor. The throttle actuator is feedback controlled such that the ATOP coincides with a target throttle opening position (TTOP). When the throttle valve continues, for a predetermined time, a state in which the absolute value of an opening position deviation between the ATOP and the IOSP is less than or equal to a first predetermined value, and in which the absolute value of a control deviation between the TTOP and the ATOP is larger than or equal to a second predetermined value, it is determined that the motor is in an open-circuit failure.

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First Claim