Vehicle brake control system and method therefor
First Claim
1. A brake control system for a vehicle, comprising:
- a first detector that detects a lateral acceleration of the vehicle;
a second detector that detects a speed of the vehicle; and
a controller that controls a braking force applied to each of front wheels and rear wheels, wherein the controller increases the braking force applied to at least the front wheels so that the ratio of the braking force applied to the front wheels versus the braking force applied to the rear wheels increases as a product of the detected lateral acceleration and the detected speed of the vehicle increases.
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Accused Products
Abstract
A method and brake control system that calculates a target brake pressure of each wheel based on a braking amount by a vehicle operator and a product of a lateral acceleration of the vehicle and a vehicle speed. The brake control system comprises a first detector that detects a lateral acceleration of the vehicle and a second detector that detects a speed of the vehicle. A controller is provided that controls a braking force applied to each of front wheels and rear wheels. The controller increases the braking force applied to the front wheels by a vehicle operator so that the ratio of the braking force applied to the front wheels versus the braking force applied to the rear wheels increases as a product of the detected lateral acceleration and the detected speed of the vehicle increases.
17 Citations
16 Claims
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1. A brake control system for a vehicle, comprising:
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a first detector that detects a lateral acceleration of the vehicle;
a second detector that detects a speed of the vehicle; and
a controller that controls a braking force applied to each of front wheels and rear wheels, wherein the controller increases the braking force applied to at least the front wheels so that the ratio of the braking force applied to the front wheels versus the braking force applied to the rear wheels increases as a product of the detected lateral acceleration and the detected speed of the vehicle increases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
determines whether the vehicle is turning while braking; and
controls the braking force applied to at least one of the front wheels and rear wheels on the basis of the absolute value of a product of the detected lateral acceleration and the detected speed of the vehicle when the controller determines that the vehicle is turning while braking.
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4. A brake control system according to claim 3, wherein the controller:
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determines whether a road on which the vehicle is travelling has an uneven friction coefficient that is different in a right area and a left area of the road which correspond to the right and left wheels respectively, and inhibits controlling of the braking force applied to the at least one of the front wheels and the rear wheels on the basis of the absolute value of the product of the detected lateral acceleration and the detected speed of the vehicle when the controller determines that the road has the uneven friction coefficient that is different in right and left areas of the road.
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5. A brake control system according to claim 1, wherein the controller:
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calculates a target braking force applied to each of the front wheels and the rear wheels on the basis of a braking amount applied to the vehicle by an operator; and
corrects the target braking force applied to the front wheels so as to be increased as an absolute value of the product of the detected lateral acceleration and the detected speed of the vehicle increases.
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6. A brake control system according to claim 1, wherein the controller:
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increases the braking force applied to the front wheels when an absolute value of a product of the detected lateral acceleration and the detected speed of the vehicle is equal to or greater than a first predetermined value and is less than a second predetermined value; and
increases the braking force applied to the front wheels and decreases the braking force applied to the rear wheels when the absolute value of the product of the detected lateral acceleration and the detected speed of the vehicle is equal to or greater than the second predetermined value.
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7. A brake control system according to claim 6, wherein the controller corrects an amount of increase in the braking force applied to the front wheels on the basis of the absolute value of the product of the detected lateral acceleration and the detected speed of the vehicle so as to prevent the braking force applied to the front wheels from exceeding a predetermined range when a braking amount applied to the vehicle by an operator becomes large.
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8. A brake control system according to claim 6, wherein a rate of increase in the braking force applied to the front wheels when the absolute value of the product of the detected lateral acceleration and the detected speed of the vehicle is equal to or greater than the second predetermined value is smaller than the amount of increase in the braking force applied to the front wheels when the absolute value of the product of the detected lateral acceleration and the detected speed of the vehicle is equal to or greater than the first predetermined value and less than the second predetermined value.
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9. A brake control system according to claim 6, wherein when the absolute value of the product of the detected lateral acceleration and the detected speed of the vehicle is equal to or greater than the second predetermined value, the controller sets the braking force applied to one of the rear wheels on an inside of a turning of the vehicle to 0.
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10. A brake control system according to claim 6, wherein when the absolute value of the product of the detected lateral acceleration and the detected speed of the vehicle is equal to or greater than the second predetermined value, the controller reduces the braking force applied to one of the rear wheels on an inside of a turning of the vehicle as the absolute value of the product increases.
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11. A brake control system according to claim 6, wherein when the absolute value of the product of the detected lateral acceleration and the detected speed of the vehicle is equal to or greater than the second predetermined value, the controller reduces the braking force applied to one of the rear wheels on an inside of a turning of the vehicle as the absolute value of the product becomes larger, and increases the braking force applied to the other of the rear wheels on an outside of a turning of the vehicle as the absolute value of the product becomes smaller.
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12. A method of controlling a brake control system in a vehicle, comprising:
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detecting a lateral acceleration of the vehicle;
detecting a speed of the vehicle;
controlling a braking force applied to at least one of a front wheel and a rear wheel; and
increasing the braking force applied to at least the front wheels so that the ratio of the braking force applied to the front wheels versus the braking force applied to the rear wheels increases as a product of the detected lateral acceleration and the detected speed of the vehicle increases. - View Dependent Claims (13, 14, 15, 16)
correcting an amount of increase in the braking force applied to the front wheels on the basis of the absolute value of a product of the detected lateral acceleration and the detected speed of the vehicle; and
preventing the braking force applied to the front wheels from exceeding a predetermined range when a braking amount applied to the vehicle by an operator becomes large.
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14. A method of controlling a brake control system according to claim 12, further comprising:
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determining whether the vehicle is turning while braking; and
controlling the braking force applied to at least one of the front wheels and rear wheels on the basis of the absolute value of a product of the detected lateral acceleration and the detected speed of the vehicle when the vehicle is determined to be turning while braking.
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15. A method of controlling a brake control system according to claim 12, further comprising:
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calculating a target braking force applied to each of the front wheels and the rear wheels on the basis of a braking amount applied to the vehicle by an operator; and
correcting, by increasing the target braking force applied to the front wheels when an absolute value of the product of the detected lateral acceleration and the detected speed of the vehicle increases.
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16. A method of controlling a brake control system according to claim 12, further comprising:
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increasing the braking force applied to the front wheels when an absolute value of a product of the detected lateral acceleration and the detected speed of the vehicle is equal to or greater than a first predetermined value and is less than a second predetermined value; and
increasing the braking force applied to the front wheels and decreases the braking force applied to the rear wheels when the absolute value of the product of the detected lateral acceleration and the detected speed of the vehicle is equal to or greater than the second predetermined value.
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Specification