Electric power steering apparatus
AssigneeToyota Jidosha Kabushiki Kaisha
InventorKenichiro Aoki
Life of this patent
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Abstract
When a steering torque sensor fails, a time delay setting section calculates delayed lateral acceleration by delaying lateral acceleration. A lateral acceleration upper limit restricting section calculates restricted lateral acceleration by restricting the upper limit of the lateral acceleration by the delayed lateral acceleration. An assist torque calculation section calculates a target assist torque on the basis of the restricted lateral acceleration such that the target assist torque increases with the restricted lateral acceleration. Thus, it is possible to properly delay steering assist in relation to detection of the lateral acceleration, whereby slippage of a vehicle due to excessive turning of a steering wheel is suppressed.
Claims7
An electric power steering apparatus comprising:
- a motor which is provided in a steering mechanism and generates steering assist torque;
- lateral acceleration obtaining means for obtaining lateral acceleration of a vehicle;
- delayed lateral acceleration setting means for setting delayed lateral acceleration by delaying the lateral acceleration obtained by the lateral acceleration obtaining means;
- restricted lateral acceleration setting means for setting restricted lateral acceleration by restricting the lateral acceleration, which is obtained by the lateral acceleration obtaining means, by using as an upper limit the delayed lateral acceleration set by the delayed lateral acceleration setting means;
- assist control quantity setting means for setting a target steering assist control quantity on the basis of the restricted lateral acceleration set by the restricted lateral acceleration setting means;
- and
- motor control means for driving and controlling the motor in accordance with the target steering assist control quantity.
Dependencies are inferred from the claim text.