Wheel ground-contact state judging device and method
First Claim
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1. A wheel ground-contact state judging device comprising:
- a detector for directly detecting, as a lateral force, a force acting on a wheel in a direction perpendicular to a wheel center plane of the wheel;
an acceleration sensor for detecting an acceleration in the lateral direction of a vehicle;
a calculator for calculating a cornering force acting on the wheel on the basis of the acceleration in the lateral direction detected by the acceleration sensor; and
a judging unit for judging the ground-contact state of the wheel on the basis of comparison between the detected lateral force and the calculated cornering force, wherein said judging unit determines an existence of a bad ground-contact state of the wheel upon a criteria being established that the calculated cornering force is smaller than the detected lateral force by a predetermined amount.
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Abstract
In wheel ground-contact state judging device and method, a detector directly detects a lateral force acting in a direction perpendicular to the wheel center plane of a wheel. An acceleration sensor detects an acceleration in the lateral direction of a vehicle. A calculator calculates a cornering force acting on each wheel on the basis of the acceleration in the lateral direction thus detected. A judging unit compares the detected lateral force with the calculated cornering force to judge whether the ground-contact state of the wheel is good or not.
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Citations
10 Claims
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1. A wheel ground-contact state judging device comprising:
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a detector for directly detecting, as a lateral force, a force acting on a wheel in a direction perpendicular to a wheel center plane of the wheel; an acceleration sensor for detecting an acceleration in the lateral direction of a vehicle; a calculator for calculating a cornering force acting on the wheel on the basis of the acceleration in the lateral direction detected by the acceleration sensor; and a judging unit for judging the ground-contact state of the wheel on the basis of comparison between the detected lateral force and the calculated cornering force, wherein said judging unit determines an existence of a bad ground-contact state of the wheel upon a criteria being established that the calculated cornering force is smaller than the detected lateral force by a predetermined amount. - View Dependent Claims (2, 3, 4, 10)
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5. A wheel ground-contact state judging method comprising:
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a first step of directly detecting, as a lateral force, a force acting on a wheel in a direction perpendicular to a wheel center plane of the wheel; a second step of detecting an acceleration in the lateral direction of a vehicle; a third step of calculating a cornering force acting on the wheel on the basis of the acceleration in the lateral direction thus detected; and a fourth step of judging the ground-contact state of the wheel on the basis of a comparison between the detected lateral force and the calculated cornering force, wherein a judging unit determines an existence of a bad ground-contact state of the wheel upon a criteria being established that the calculated cornering force is smaller than the detected lateral force by a predetermined amount. - View Dependent Claims (6, 7, 8, 9)
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Specification