Patent ID: 6465974
Filing Date: 2002-10-15
Classification: F02D

Abstract:
An air intake amount control apparatus for an engine, comprising:a throttle valve mounted on a rotation shaft in an intake passage of said engine; a throttle sensor for sensing an opening degree of said throttle valve; a motor having a rotor coupled to said rotation shaft for driving said throttle valve based upon engine operating information; a rotor magnetic pole position learning unit for driving said motor in a stepwise manner so as to learn a magnetic pole position of said rotor that is detected by said throttle sensor; a rotor magnetic pole position learned value storing unit for storing therein said magnetic pole position of said rotor learned by said rotor magnetic pole position learning unit as a magnetic pole position learned value; a magnetic pole position identifying unit for driving said motor to a predetermined stepwise position so as to identify said magnetic pole position learned value stored in said rotor magnetic pole position learned value storing unit with the magnetic pole position of said motor at said predetermined stepwise position detected by said throttle sensor, and a key switch on/off judging unit for judging whether a key switch is turned on or off, wherein when said rotor magnetic pole position identifying unit judges that the rotor magnetic pole position learned value is not coincident with the magnetic pole position of said motor detected by said throttle sensor, said rotor magnetic pole position identifying unit prohibits execution of a throttle opening degree control operation until the key switch is turned off.