Daimlerchrysler Corporation

Erik J Hansen

John Theofanopoulos

Frank Vettraino, Jr

John J C Kopera

A low power supervisor controller for an electric vehicle substantially reduces ignition-off draw current in the main control module. The supervisor controller has a sleep controller for powering down the main control module when an interrupt event has not occurred. The sleep controller powers up the main control module when the interrupt event has occurred. The supervisor controller also has an interrupt monitor for determining when the interrupt event occurs, as well as a supervisor wait module. The supervisor wait module establishes and controls an interrupt cycle, wherein the interrupt cycle is defined by an amount of time between determinations of the interrupt monitor.

Low power supervisor controller

The present invention provides a system for monitoring usage of a electric vehicle's battery which offsets the display when the vehicle is in an on condition. A battery energy measuring device is provided which measures the conditions indicative of the maximum available current of the battery and generates a charge signal indicative of the conditions indicative of the maximum available current of the battery. A display is provided which is responsive to the charge signal for displaying the maximum available current of the battery. An offset device is provided which is responsive to the keyswitch to provide a keyswitch signal to the battery energy measuring device representative of the on and off condition of the keyswitch. The battery energy measuring device offsets the charge signal when the keyswitch is in an on condition such that the display displays the on and off condition of the keyswitch.

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Oxford, MI, United States of America

Erik J Hansen