Patent ID: 7411368

Claim:
An electric motor speed controller for a vehicle, comprising: a motor operable to provide a propulsion force to move the vehicle; a position sensor provided on the motor to produce position information of the motor; a motor speed counter operable to produce an actual motor speed signal; a motor power driver operable to deliver electric power to the motor and to produce a drive current signal; a pulse width modulation logic controller operable to control the motor power driver based on the position information and a pulse width modulation command signal; an analog comparator operable to compare the drive current signal with a drive control signal and to produce the pulse width modulation command signal; an input voltage setting device operable to produce a target motor speed signal; an analog comparator operable to compare the actual motor speed signal with the target motor speed signal and to produce a comparison result; and an up/down counter operable to increase or decrease a number of counts based on the comparison result, and to produce the drive control signal.