VEHICLE STEERING SYSTEM
First Claim
1. A vehicle steering system comprising:
- a steering actuator that imparts a steering force to a steering mechanism of a vehicle;
an automatic steering controller that performs an automatic steering control by controlling the steering actuator based on a target steering angle;
a steering-without-driving determination unit that determines whether or not a steering-without-driving in which the steering mechanism performs a steering operation in such a state that the vehicle is being stopped occurs during the automatic steering control by the automatic steering controller;
a threshold value setting unit that sets a threshold value for canceling the automatic steering control by the automatic steering controller, the threshold value being set so that the automatic steering control is made more difficult to be cancelled at the time the steering-without-driving determination unit determines that the steering-without-driving occurs as compared with at the time the steering-without-driving determination unit determines that the steering-without-driving does not occur; and
an automatic steering cancellation unit that cancels the automatic steering control by the automatic steering control unit based on the threshold value set by the threshold value setting unit.
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Accused Products
Abstract
In a steering-without-driving state, a larger current limit value, drive limit time and steering angle deviation threshold value are set than when a low-speed driving state occurs. An automatic parking mode is held until a time period over which a state where a motor current value of an electric motor which drives a steering mechanism is equal to the current limit value reaches the drive limit time. Even though the state where the motor current value is equal to the current limit value has continued over the drive limit time, the automatic parking mode is held during the steering angle deviation not exceeding the steering angle deviation threshold value. When the state where the motor current value is equal to the current limit value has continued over the drive limit time Ta and that the steering angle deviation exceeds the threshold value, the automatic parking control is cancelled.
28 Citations
4 Claims
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1. A vehicle steering system comprising:
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a steering actuator that imparts a steering force to a steering mechanism of a vehicle; an automatic steering controller that performs an automatic steering control by controlling the steering actuator based on a target steering angle; a steering-without-driving determination unit that determines whether or not a steering-without-driving in which the steering mechanism performs a steering operation in such a state that the vehicle is being stopped occurs during the automatic steering control by the automatic steering controller; a threshold value setting unit that sets a threshold value for canceling the automatic steering control by the automatic steering controller, the threshold value being set so that the automatic steering control is made more difficult to be cancelled at the time the steering-without-driving determination unit determines that the steering-without-driving occurs as compared with at the time the steering-without-driving determination unit determines that the steering-without-driving does not occur; and an automatic steering cancellation unit that cancels the automatic steering control by the automatic steering control unit based on the threshold value set by the threshold value setting unit. - View Dependent Claims (2, 3, 4)
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Specification