Anti-skid control system for use in motor vehicle
First Claim
1. An anti-skid control system for use in a vehicle, comprising:
- wheel sensor means for sensing wheel speeds of each wheel of said vehicle;
road-surface determining means for determining a condition of a road surface on which said vehicle is running based on the sensed wheel speeds;
reference speed selecting means for selecting a reference speed in accordance with a sensed rear-right wheel speed and rear-left wheel speed, said reference speed selecting means determining a mean value speed of said rear-right and rear-left wheel speeds and a maximum speed between said rear-right and rear-left wheel speeds, said reference speed being selected as one of said means value speed and said maximum speed based on said determined road surface condition; and
control means for performing slip control of said wheels based on said reference speed.
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Accused Products
Abstract
An anti-skid control system for use in a motor vehicle having wheels whose rotational speeds are sensed by wheel sensors. The anti-skid control system decides the condition of the road-surface, on which the motor vehicle is running, on the basis of signals from wheel sensors. A reference speed is further calculated on the basis of the sensed speeds of the wheels symmetrically provided at the rear-right and rear-left sides with respect to the advancing direction of the motor vehicle. That is a selected one of an average value of the speeds of the rear-right and rear-left wheels sensed by the wheel sensors and the maximum one of the sensed rear-right and rear-left wheel speeds is selected in accordance with the decided road-surface condition. The reference speed is calculated on the basis of the selected one. A control unit of the anti-skid control system performs slip control of the wheels in accordance with the calculated reference speed. With this arrangement, the anti-skid control system can improve the braking efficiency and controllability irrespective of turning of the motor vehicle.
22 Citations
7 Claims
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1. An anti-skid control system for use in a vehicle, comprising:
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wheel sensor means for sensing wheel speeds of each wheel of said vehicle; road-surface determining means for determining a condition of a road surface on which said vehicle is running based on the sensed wheel speeds; reference speed selecting means for selecting a reference speed in accordance with a sensed rear-right wheel speed and rear-left wheel speed, said reference speed selecting means determining a mean value speed of said rear-right and rear-left wheel speeds and a maximum speed between said rear-right and rear-left wheel speeds, said reference speed being selected as one of said means value speed and said maximum speed based on said determined road surface condition; and control means for performing slip control of said wheels based on said reference speed. - View Dependent Claims (2, 3, 4, 5)
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6. An anti-skid control system for use in a vehicle, comprising:
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wheel sensor means for sensing right wheel speeds and left wheel speeds of said vehicle; average-value calculation means for calculating an average value speed between said right and left wheel speeds; estimation vehicle speed calculation means for calculating an estimation speed of said vehicle based on said average value speed; control means for performing slip control in accordance with the sensed wheel speeds and said estimation speed; low-friction determination means for determining that a road surface on which said vehicle is running is in a low-frictions state based on the sensed wheel speeds; and switching means for switching said estimation vehicle speed calculation means from calculating the estimation vehicle speed based on said average value speed to a maximum one of said right wheel speeds and left wheel speeds when the road surface is determined to be in the low-friction state.
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7. An anti-skid control system for use in a vehicle, comprising:
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wheel sensor means for sensing wheel speeds of each wheel of said vehicle; wheel speed processing means for calculating wheel speed factors including; average value factor means for calculating an average value between a rear-right wheel speed and rear-left wheel speed, first factor selection means for selecting a first factor equal to a maximum of said rear-right wheel speed and rear-left wheel speed, and second factor selection means for selecting a second factor equal to a maximum of a front-right wheel speed and front-left wheel speed; road condition determining means for determining, based on said sensed wheel speeds, whether a road surface on which said vehicle is running is in a low friction state or a high friction state; estimation vehicle speed selecting means for selecting an estimation speed, said estimation speed being selected as the greater one of the average value, and the first factor when a high friction state road surface is determined, and selected as the greater one of said first factor and said second factor when a low friction state road surface is determined; and control means for performing slip control in accordance with the selected estimation speed.
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Specification