Curtis Instruments Inc.

Warren J Vinzant

Stephen F Post

Scott A Bowman

George L Ackerson

A motor controller comprises a plug detect circuit which detects 'continuous' plug diode conduction during plug braking. The plug detect circuit detects 'continuous' plug braking by detecting when a plug diode is or is not conducting current throughout substantially the entire time that a power MOSFET controlling the plug braking is conductive in one pulse width modulated MOSFET switching cycle. Continuous plug detection facilitates the motor controller's controlling a vehicle so that the vehicle has a more constant and smooth plug braking deceleration and subsequent powered acceleration in the opposite direction. According to another aspect of the invention, a motor controller comprises a POT HI and a POT LO driver circuit. The POT HI and POT LO driver circuits allow the detection of faults in throttle devices and the connections of the throttle devices to the POT HI and POT LO driver circuits. One of the POT HI and POT LO driver circuits has a greater current limit than does the other driver circuit so that numerous faults including open circuit breaks in the connection of a throttle device as well as shorts across or through the throttle device are detectable by the motor controller.

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Castro Valley, CA, United States of America

Warren J Vinzant