Electricity: motive power systems – Constant motor current – load and/or torque control
Patent
1994-11-04
1995-12-12
Martin, David S.
Electricity: motive power systems
Constant motor current, load and/or torque control
318251, 318701, 180791, 180142, 36442405, 3889075, 388930, H02P 700
Patent
active
054752892
ABSTRACT:
A control arrangement for an electric assist steering system having a variable reluctance motor (26) includes sensing (54) motor position and sensing (110) applied steering torque. A controller determines a desired motor torque assist value in response to the applied steering torque. A plurality of look-up tables are provided having a plurality of motor current values versus motor position values stored therein. The stored motor current values are functionally related to motor position values. The controller selects a first (T1) and second (T2) torque look-up table from the plurality of look-up tables. The first look-up table corresponds to a torque value less than the desired motor torque assist value. The second look-up table corresponds to a torque value greater than the desired motor torque assist value. A first motor current value (I1) is determined by interpolating between two current values corresponding to two motor positions stored in the first look-up table closest to the sensed motor position. A second motor current value (I2) is determined by interpolating between two current values corresponding to two motor positions stored in the second look-up table closest to the sensed motor position. 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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Gluch Mark W.
McLaughlin Kevin M.
Martin David S.
TRW Inc.
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