Motiv Power Systems, Inc.

Krishnakumar Ramamoorthy

James Michael Castelaz

Tai-sik Hwang

Methods and apparatus for hill hold in an electric vehicle are disclosed. In one embodiment, a system includes a motor and a controller operable in a hill hold control mode. The motor is coupled to one or more wheels of a vehicle. In the hill hold control mode, the controller controls the motor to generate a holding torque to maintain a vehicle speed at zero. The holding torque prevents a change in vehicle position. The holding torque opposes changes in the road grade, the shaft stiffness, or the vehicle weight to prevent oscillations in the vehicle position. The controller uses at least one of road grade, shaft stiffness, and vehicle weight to control the motor to generate the holding torque. The hill hold control mode operates across a range of vehicle weights, a range of shaft stiffnesses, and a range of road grades, without additional tuning of the controller.

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Foster City, CA, United States of America

Krishnakumar Ramamoorthy