Electricity: motive power systems – Constant motor current – load and/or torque control
Reexamination Certificate
2006-08-01
2006-08-01
Fletcher, Marlon T. (Department: 2837)
Electricity: motive power systems
Constant motor current, load and/or torque control
C318S434000, C318S471000, C318S472000, C318S473000, C318S433000, C701S041000, C180S443000, C180S446000
Reexamination Certificate
active
07084593
ABSTRACT:
An electric power assist steering control system having an electric motor actuator and a motor driver circuit for generating and applying a motor current to the electric motor actuator. A current sensor is included for measuring the motor current from the motor driver circuit and generating a feedback signal. A torque sensor is included for sensing an applied steering torque and providing a torque command signal having a value indicative of the applied steering torque. A controller calculates a temperature of the electric temperature of the electric motor actuator by evaluating the motor current applied to the electric motor actuator. In the case that the calculated temperature of the electric motor actuator surpasses a predetermined temperature, the electric power assist steering control system reduces the amount of motor current applied to the electric motor actuator thereby reducing the temperature of the electric motor actuator.
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Brinks Hofer Gilson & Lione
Fletcher Marlon T.
Miller Patrick
Visteon Global Technologies Inc.
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