Antilock brake control method for motor vehicle
First Claim
1. In an antilock brake control method for motor vehicles, comprising the steps of:
- detecting an actual wheel speed of each wheel of a vehicle by means of a wheel speed sensor;
setting a reference vehicle speed by computation of the wheel speed;
determining a reference wheel speed which is lower than the reference vehicle speed;
determining that the wheel is to lock when the actual wheel speed becomes a predetermined value below said reference wheel speed as a result of braking operation;
decreasing braking hydraulic pressure acting on the wheel, when the actual wheel speed becomes a predetermined value below the reference wheel speed, to allow the actual wheel speed to increase due to the reaction force from the road surface;
reincreasing braking hydraulic pressure when the actual wheel speed exceeds said reference wheel speed to indicate that the actual wheel speed recovers to a sufficient speed; and
carrying out control of the braking hydraulic pressure by decreasing and increasing the pressure in dependency on the reference wheel speed;
the improvement comprising the steps of;
detecting at least a phenomenon occurring in the vehicle in a J-turn state thereof;
determining whether or not the phenomenon is exceeds a predetermined value; and
carrying out the control of the braking hydraulic pressure under another antilock brake control condition for the J-turn state when the phenomenon exceeds the predetermined value.
2 Assignments
0 Petitions
Accused Products
Abstract
In an antilock brake control for motor vehicles wherein a condition of locking of the wheels during braking is detected from the wheel speeds, and a control pattern of decreasing and reincreasing of the braking hydraulic pressure is repeated for carrying out effective braking operation, at least a phenomenon occurring in the vehicle in J-turn state is detected, and when the phenomenon exceeds a predetermined value, the antilock brake control is shifted from the normal mode to a J-turn mode in which different conditions are used. To detect the J-turn state, the difference in wheel speed between the right and left wheels is detected. Alternatively, lateral acceleration of the vehicle is also detected. Another alternative is a combination of the steering angle, the coefficient of friction between the wheels and the road surface, and the vehicle speed.
50 Citations
6 Claims
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1. In an antilock brake control method for motor vehicles, comprising the steps of:
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detecting an actual wheel speed of each wheel of a vehicle by means of a wheel speed sensor; setting a reference vehicle speed by computation of the wheel speed; determining a reference wheel speed which is lower than the reference vehicle speed; determining that the wheel is to lock when the actual wheel speed becomes a predetermined value below said reference wheel speed as a result of braking operation; decreasing braking hydraulic pressure acting on the wheel, when the actual wheel speed becomes a predetermined value below the reference wheel speed, to allow the actual wheel speed to increase due to the reaction force from the road surface; reincreasing braking hydraulic pressure when the actual wheel speed exceeds said reference wheel speed to indicate that the actual wheel speed recovers to a sufficient speed; and carrying out control of the braking hydraulic pressure by decreasing and increasing the pressure in dependency on the reference wheel speed; the improvement comprising the steps of; detecting at least a phenomenon occurring in the vehicle in a J-turn state thereof; determining whether or not the phenomenon is exceeds a predetermined value; and carrying out the control of the braking hydraulic pressure under another antilock brake control condition for the J-turn state when the phenomenon exceeds the predetermined value. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification