Brake control device in an antilock brake system
First Claim
1. A brake control device for use in an antilock brake system for automatically adjusting a valve responsive to an indication of brake locking to reduce a fluid pressure in a brake cylinder to stop brake locking, said brake control device comprising:
- means for outputting a pressure reduction signal K, in accordance with wheel deceleration;
pressure detecting means for providing an indication of a current brake cylinder fluid pressure;
means for outputting a compensation value α
in accordance with vehicle deceleration, said vehicle deceleration being proportional to said fluid pressure;
means for calculating a solenoid opening coefficient J in accordance with said compensation value α and
said pressure reduction signal K; and
means for determining a duty ratio in accordance with said solenoid opening coefficient J, said duty ratio being a time signal indicative of predetermined time periods during which said valve is to be opened and closed to adjust the brake cylinder fluid pressure, the time period during which said valve is opened being larger when said detected current brake cylinder fluid pressure is decreasing, thereby maintaining said predetermined amount of pressure reduction.
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Accused Products
Abstract
A brake control device in an antilock brake system is disclosed for automatically adjusting a valve according to a wheel brake locking symptom to reduce a fluid pressure in a brake cylinder and eliminating symptom of brake locking. The brake control device includes a microcomputer which has a step for outputting a pressure reduction signal K required to eliminate a locking symptom, and a detector for detecting a current brake cylinder pressure. The microcomputer further has a step for correcting the pressure reduction signal K based on the current brake cylinder pressure. Thus, a corrected pressure reduction signal K is used for reducing the brake cylinder pressure.
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Citations
15 Claims
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1. A brake control device for use in an antilock brake system for automatically adjusting a valve responsive to an indication of brake locking to reduce a fluid pressure in a brake cylinder to stop brake locking, said brake control device comprising:
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means for outputting a pressure reduction signal K, in accordance with wheel deceleration; pressure detecting means for providing an indication of a current brake cylinder fluid pressure; means for outputting a compensation value α
in accordance with vehicle deceleration, said vehicle deceleration being proportional to said fluid pressure;means for calculating a solenoid opening coefficient J in accordance with said compensation value α and
said pressure reduction signal K; andmeans for determining a duty ratio in accordance with said solenoid opening coefficient J, said duty ratio being a time signal indicative of predetermined time periods during which said valve is to be opened and closed to adjust the brake cylinder fluid pressure, the time period during which said valve is opened being larger when said detected current brake cylinder fluid pressure is decreasing, thereby maintaining said predetermined amount of pressure reduction. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A brake control device in an antilock brake system for detecting brake locking symptoms separately in right and left wheels and for automatically adjusting a valve to reduce a fluid pressure in a brake cylinder for eliminating a symptom of brake locking, said brake control device comprising:
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means for computing a split μ
coefficient CTR, which expresses a difference in coefficients of friction of the road surfaces under said right and left wheels;means for outputting a pressure reduction signal K; and means for correcting said pressure reduction signal K such that the pressure reduction signal K for a first wheel, which is on a road surface having a higher coefficient of friction, is decreased proportionally to said split μ
coefficient CTR, and that said pressure reduction signal K for a second wheel, which is on a road surface having a lower coefficient of friction, is increased proportionally to said split μ
coefficient CTR. - View Dependent Claims (9)
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10. A brake control device in an antilock brake system for detecting brake locking symptoms separately in right and left wheels and for automatically adjusting a valve to reduce a fluid pressure in a brake cylinder for eliminating a symptom of brake locking, said brake control device comprising:
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means for computing a split μ
coefficient CTR, which expresses a difference in coefficients of friction of the road surfaces under said right and left wheels;means for outputting a current brake pressure level; and means for correcting said current brake pressure level such that said current brake pressure level for a first wheel, which is on a road surface having a higher coefficient of friction, is increased proportionally to said split μ
coefficient CTR, and that said current brake pressure level for a second wheel, which is on a road surface having a lower coefficient of friction, is decreased proportionally to said split μ
coefficient CTR. - View Dependent Claims (11)
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12. A brake control device in an antilock brake system for a motorcycle for automatically adjusting a valve provided in brake fluid lines for front and rear wheels of the motorcycle to reduce a fluid pressure in a brake cylinder for eliminating symptoms of brake locking independently in said front and rear wheels, said brake control device comprising:
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means for detecting a vehicle deceleration (VCEL); means of determining whether or not an antilock brake control is being applied to either one of said front and rear wheels; vehicle deceleration amplification means for amplifying said detected vehicle deceleration by a predetermined amount to produce a corrected vehicle deceleration value when said determining means determines that said antilock brake control is being applied to one of said front and rear wheels; and antilock brake control means for increasing an amount of said antilock brake control to said one wheel by adjusting a time in which said valve is opened in accordance with said corrected vehicle deceleration value. - View Dependent Claims (13, 14, 15)
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Specification