Method of preventing over stroke in rear-wheel steering system and linear sensor applied thereto
The present invention relates to a method of preventing over stroke in a rear-wheel steering system for a vehicle, and more particularly, to a method of preventing the over stroke of a lead screw using a linear sensor moving together with the lead screw in a rear-wheel steering system. In detail, there is provided a method of preventing over stroke in a rear-wheel steering system, including determining whether a linear sensor which moves in conjunction with a lead screw enters preliminary sections A of a stroke section a and restricting the movement of the lead screw when the linear sensor enters the preliminary sections A.
1. A method of preventing over stroke in a rear-wheel steering system, comprising:
determining whether a linear sensor which moves in conjunction with a lead screw enters preliminary sections A of a stroke section a; and
restricting the movement of the lead screw when the linear sensor enters the preliminary sections A.
2. A method of preventing over stroke in a rear-wheel steering system, comprising:
determining whether a linear sensor which moves in conjunction with a lead screw enters preliminary sections A of a stroke section a;
restricting the movement of the lead screw when the linear sensor enters the preliminary sections A
determining whether the linear sensor moves beyond the preliminary sections A and enters over stroke sections b and c; and
switching a moving direction of the lead screw when the linear sensor enters the over stroke sections b and c.
3. The method of claim 2 , wherein the linear sensor has a first sensor output and a second sensor output, and
wherein a controller uses a difference between the first sensor output and the second sensor output in the determining of entry.
4. The method of claim 1 , wherein a controller, in the restricting of the movement, reduces a speed of a motor connected to the lead screw.
5. The method of claim 1 , wherein a controller, in the restricting of the movement, reduces current supplied to a motor connected to the lead screw.
6. The method of claim 2 , wherein a controller, in the switching of the moving direction, changes a polarity of current supplied to a motor connected to the lead screw.
7. A linear sensor comprising:
a housing comprising an accommodation space therein;
a mobile member which is provided in the accommodation space, at least a part thereof extending outside the housing and connected to a mounting unit, interworks with a lead screw, and moves left and right in a stroke section a;
a magnet member provided in the mobile member and configured to generate a magnetic force; and
an output unit configured to sense a position of the magnet member and to generate a first sensor output and a second sensor output.
8. The linear sensor of claim 7 , wherein when the mobile member enters preliminary sections A in the stroke section a, the movement of the lead screw is restricted.
9. The linear sensor of claim 8 , wherein when the mobile member moves beyond the preliminary sections A and enters over stroke sections b and c, a moving direction of the lead screw is switched.
10. The linear sensor of claim 7 , wherein a position of the mobile member 120 is sensed based on a difference between the first sensor output and the second sensor output.