Apparatus and method for controlling rear wheel braking force of vehicle
First Claim
1. In a rear wheel braking force control apparatus of a vehicle comprising proportioning valves (571, 572) disposed in passages (56, 59) for supplying a hydraulic pressure generated by a master cylinder (53) to wheel cylinders (553, 554) of right and left 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 (62,
63) disposed in the passage to effect or invalidate the action of said proportioning valves;
said electromagnetic valves being ON/OFF valves disposed in passages (60,
61) for bypassing said proportioning valves and transmitting the master cylinder pressure to said wheel cylinders; and
control means (71) for controlling operation of said electromagnetic valves;
said apparatus further comprises;
braking degree detection means for detecting degree of braking during braking of the vehicle; and
turning condition detection means for detecting turning condition of the vehicle;
said proportioning valves and said electromagnetic valves being provided for the individual right and left rear wheels;
said control means 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 degree, and effect the action of said proportioning valves when the braking degree is stronger than the setting degree; and
during turning of the vehicle, the setting degree being corrected so that the setting degree of said electromagnetic valve at the outer wheel side of turning is relatively higher than the setting degree of said electromagnetic valve at the inner wheel side of turning.
2 Assignments
0 Petitions
Accused Products
Abstract
A rear wheel braking force control apparatus of a vehicle includes a pressure sensor 74 for detecting master cylinder pressure, right and left proportioning valves 571 and 572 individually disposed in passages for transmitting master cylinder pressure to right and left wheel cylinders of the rear wheels for controlling to decrease changes in wheel cylinder pressure relative to changes in master cylinder pressure, right and left PCV bypass valves 62 and 63 for individually bypassing the proportioning valves, and a controller 71 which, when the vehicle is determined by a steering angle sensor 77 or the like to be turning, closes the PCV bypass valve at the outer wheel side when the master cylinder pressure is higher than the pressure of the PCV bypass valve at the inner wheel side.
12 Citations
20 Claims
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1. In a rear wheel braking force control apparatus of a vehicle comprising proportioning valves (571, 572) disposed in passages (56, 59) for supplying a hydraulic pressure generated by a master cylinder (53) to wheel cylinders (553, 554) of right and left 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;
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electromagnetic valves (62,
63) disposed in the passage to effect or invalidate the action of said proportioning valves;said electromagnetic valves being ON/OFF valves disposed in passages (60,
61) for bypassing said proportioning valves and transmitting the master cylinder pressure to said wheel cylinders; andcontrol means (71) for controlling operation of said electromagnetic valves; said apparatus further comprises; braking degree detection means for detecting degree of braking during braking of the vehicle; and turning condition detection means for detecting turning condition of the vehicle; said proportioning valves and said electromagnetic valves being provided for the individual right and left rear wheels; said control means 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 degree, and effect the action of said proportioning valves when the braking degree is stronger than the setting degree; and during turning of the vehicle, the setting degree being corrected so that the setting degree of said electromagnetic valve at the outer wheel side of turning is relatively higher than the setting degree of said electromagnetic valve at the inner wheel side of turning. - 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. In a rear wheel braking force control method for a vehicle comprising controlling operation of electromagnetic valves disposed in passages (56, 59) for supplying a hydraulic pressure generated by a master cylinder (53) to wheel cylinders (553, 554) of right and left rear wheels to effect or invalidate operation of proportioning valves (571, 572) for controlling wheel cylinder pressure so that increasing rate of wheel cylinder pressure is smaller than increasing rate of master cylinder pressure, said electromagnetic valves being ON/OFF valves disposed in passages (60, 62) for bypassing said proportioning valves and transmitting the master cylinder pressure to said wheel cylinders;
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said method further comprises; a braking degree detection step (S14) for detecting a braking degree during braking of the vehicle; a turning condition detection means (S20, S24) for detecting turning condition of the vehicle; an invalidation step (S22, S26, S11) for operating said electromagnetic valves to invalidate operation of said proportioning valves when the braking degree detected in said braking degree detection step is weaker than a setting degree; an effecting step (S22, S26, S23, S27) for operating said electromagnetic valves to effect operation of said proportioning valves when the braking degree is stronger than the setting degree; and a turning correction step (S25) for correcting the setting degree of said electromagnetic valve at the outer wheel side of turning to a relatively higher value than the setting value of said electromagnetic valve at the inner wheel side of turning according to detection result of said turning condition detection step during turning of the vehicle. - View Dependent Claims (20)
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Specification