Steering assist apparatus and method for vehicle
First Claim
1. A steering assist apparatus for a vehicle, comprising a controller that:
- receives input from a sensor; and
controls a motor based on input from the sensor;
wherein the motor applies an assist torque;
wherein the assist torque at any given target lateral acceleration, the any given target lateral acceleration being less than or greater than 0, is so set that the assist torque in an increasing state of the target lateral acceleration is larger than the assist torque in a decreasing state of the target lateral acceleration, andwherein in a region near a target lateral acceleration of 0, a difference at any given target lateral acceleration between the assist torque applied in the increasing state of the target lateral acceleration and the assist torque applied in the decreasing state of the target lateral acceleration becomes smaller as the any given target lateral acceleration approaches 0.
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Accused Products
Abstract
Characteristic lines A to D of lateral acceleration G-required torque T in determination of required torque T are used as switched according to increase/decrease of the absolute value of the lateral acceleration, and the direction thereof. The lines A, C used in increase of the absolute value of the lateral acceleration G are so set that the absolute value of required torque T becomes larger at the same lateral acceleration G (G≠0) than that with the lines B, D used in decrease of the absolute value of the lateral acceleration G. The difference between line A and line B (the difference between line C and line D as well) at the same lateral acceleration G is so set that the difference near the lateral acceleration of 0 is smaller than that in the other regions. Particularly, it is preferable to set the required torque T to 0 at the lateral acceleration G of 0.
17 Citations
9 Claims
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1. A steering assist apparatus for a vehicle, comprising a controller that:
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receives input from a sensor; and controls a motor based on input from the sensor; wherein the motor applies an assist torque; wherein the assist torque at any given target lateral acceleration, the any given target lateral acceleration being less than or greater than 0, is so set that the assist torque in an increasing state of the target lateral acceleration is larger than the assist torque in a decreasing state of the target lateral acceleration, and wherein in a region near a target lateral acceleration of 0, a difference at any given target lateral acceleration between the assist torque applied in the increasing state of the target lateral acceleration and the assist torque applied in the decreasing state of the target lateral acceleration becomes smaller as the any given target lateral acceleration approaches 0. - View Dependent Claims (2, 3, 4, 5)
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6. A steering assist method for a vehicle comprising:
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determining a target lateral acceleration for a steering assist operation, and applying an assist steering force for assisting a driver'"'"'s steering force in response to the target lateral acceleration, wherein the assist torque at any given target lateral acceleration, the any given target lateral acceleration being less than or greater than 0, is so set that the assist torque in an increasing state of the target lateral acceleration is larger than the assist torque in a decreasing state of the target lateral acceleration, and wherein in a region near a target lateral acceleration of 0, a difference at any given target lateral acceleration between the assist torque applied in the increasing state of the target lateral acceleration and the assist torque applied in the decreasing state of the target lateral acceleration becomes smaller as the any given target lateral acceleration approaches 0. - View Dependent Claims (7, 8, 9)
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Specification