Patent ID: 6239567
Filing Date: 2001-05-29
Classification: H02P

Abstract:
A control device for controlling rotation speed of brushless motor employed in a motor vehicle, comprising:first means for deriving a voltage correction factor based on a source voltage and a reference voltage, said source voltage being a voltage of electric power supplied from a battery mounted on the vehicle;second means for picking up an identification data from a table with reference to an input duty issued from an air conditioning control unit;third means for selecting primary and secondary conversation factors with reference to the picked up identification data;fourth means for calculating a duty correction factor from said voltage correction factor said selected primary and secondary conversion factor;fifth means for calculating a medium duty from said input duty and said duty correction factor;sixth means for looking up a linearity correcting factor from a linearity correction table, with reference to said medium duty; andseventh means for calculating an output duty from said medium duty and said voltage correction factor, said output duty being used for producing a pulse signal to drive the brushless motor.