Rear wheel braking force control apparatus and control method therefor
First Claim
1. A rear wheel braking force control apparatus of a vehicle comprising:
- proportioning valves disposed in passages for supplying a hydraulic pressure generated by a master cylinder to wheel cylinders of rear wheels for controlling wheel cylinder pressure so that increasing rate of the wheel cylinder pressure is smaller than increasing rate of master cylinder pressure;
electromagnetic valves disposed in the passages to affect or invalidate the action of said proportioning valves;
a rear wheel antiskid brake system for preventing locking of the rear wheels;
braking degree detection means for detecting a braking degree during braking of the vehicle; and
control means for operating said electromagnetic valves to invalidate the action of said proportioning valves when the braking degree detected by said braking degree detection means is weaker than a setting value, operating said electromagnetic valves to effect the action of said proportioning valves when the braking degree is stronger than the setting degree, and correcting the setting value to a lower value when operation of said rear wheel antiskid brake system is detected.
1 Assignment
0 Petitions
Accused Products
Abstract
A first target value is set as an initial value of split point pressure, a master cylinder pressure is set as a second target value of split point pressure in a memory when ABS valves (17, 20, and 23) are operated, thereafter when a sign of locking of the rear wheels is detected, the target value is reduced even further and set in the memory, the target value is maintained for a predetermined time by timer control at every setting of a new target value, and when a braking deceleration generated while the target value is maintained in the memory, a controller (37) controls so that the target value is increased after the completion of braking. When the master cylinder pressure is higher than the target value stored in the memory, proportioning valves (26 and 27) are closed to decrease a ratio of the rear wheel braking force to the front wheel braking force, thereby always achieving appropriate control over the rear wheel braking force allocation.
12 Citations
36 Claims
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1. A rear wheel braking force control apparatus of a vehicle comprising:
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proportioning valves disposed in passages for supplying a hydraulic pressure generated by a master cylinder to wheel cylinders of rear wheels for controlling wheel cylinder pressure so that increasing rate of the wheel cylinder pressure is smaller than increasing rate of master cylinder pressure; electromagnetic valves disposed in the passages to affect or invalidate the action of said proportioning valves; a rear wheel antiskid brake system for preventing locking of the rear wheels; braking degree detection means for detecting a braking degree during braking of the vehicle; and control means for operating said electromagnetic valves to invalidate the action of said proportioning valves when the braking degree detected by said braking degree detection means is weaker than a setting value, operating said electromagnetic valves to effect the action of said proportioning valves when the braking degree is stronger than the setting degree, and correcting the setting value to a lower value when operation of said rear wheel antiskid brake system is detected. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A rear wheel braking force control method for a vehicle for controlling operation of electromagnetic valves disposed in passages for supplying a hydraulic pressure generated by a master cylinder to wheel cylinders of rear wheels to affect or invalidate operation of proportioning valves for controlling wheel cylinder pressures so that increasing rate of wheel cylinder pressure is smaller than increasing rate of master cylinder pressure, comprising:
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a step for detecting a braking degree during braking of the vehicle; a step for operating said electromagnetic valves to invalidate the action of said proportioning valves when the detected braking degree is weaker than a setting value, and operating said electromagnetic valves to effect the action of said proportioning valves when the braking degree is stronger than the setting degree; a step for detecting operation of a rear wheel antiskid brake system; and a step for correcting the setting value to a lower value when operation of said rear wheel antiskid brake system is detected. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36)
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Specification