Method and apparatus for controlling an electric assist steering

Details Method and apparatus for controlling an electric assist steering Method and apparatus for controlling an electric assist steering

1996-05-29

1998-04-28

Pedder, Dennis H.

Motor vehicles

Steering gear

With electric power assist

364424051, B62D 504

Patent

active

057433518

ABSTRACT:
A control arrangement for an electric assist steering system having a variable reluctance motor (26) includes a motor position sensor (54) and an applied steering torque sensor (110). A controller determines a desired motor torque assist value in response to the applied steering torque. The controller modifies the desired torque assist value to linearize the gain relationship between the desired torque assist value and motor torque output. A plurality of look-up tables have a plurality of motor current values versus motor position values stored therein. The controller selects a first (T1) look-up table corresponding to a torque value less than the modified motor torque assist value and a second (T2) look-up table corresponding to a torque value greater than the modified motor torque assist value. A first motor current value (I1) and second motor current value (I2) are determined by interpolation. A final motor current value (ICMD) is determined by interpolating between the first and second determined motor current values. A motor control signal is provided in response to the determined final motor current value.

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