Fluid-pressure and analogous brake systems – Multiple fluid-receiving devices – Multiple motors
Patent
1985-07-30
1987-04-21
Butler, Douglas C.
Fluid-pressure and analogous brake systems
Multiple fluid-receiving devices
Multiple motors
188195, 188349, 303 15, 303 22R, B60T 818
Patent
active
046591508
ABSTRACT:
An electronic brake control system, according to the present invention, has a controller. The controller employs a memory which stores a table or map representing split point values relative to vertical displacement between the sprung mass and the unsprung mass of the vehicle. The split point data stored in the memory are determined in accordance with the unique spring characteristics of the specific vehicle to which the brake control system is applied. The controller derives a reference pressure corresponding to the split point and compares the reference pressure with an actual hydraulic braking pressure. When the actual braking pressure is lower than the reference pressure, the controller holds a proportioning valve device inactive so as to distribute hydraulic braking pressure built up in a master cylinder among individual wheel cylinders so that the braking pressure in the wheel cylinders increases at a rate matching the rate of increase of the fluid pressure in the master cylinder. On the other hand, when the actual braking pressure is equal to or greater than the reference pressure, the controller activates the proportioning valve so as to distribute the braking pressure to the wheel cylinders such that the braking pressure in the wheel cylinder increases at a controlled rate related to the rate of pressure increase in the master cylinder.
REFERENCES:
patent: 4289358 (1981-09-01), Dufft et al.
patent: 4312543 (1982-01-01), Kubota
patent: 4358163 (1982-11-01), Young
patent: 4453778 (1984-06-01), Smith et al.
patent: 4502735 (1985-03-01), Kubota
patent: 4560208 (1985-12-01), Kubota
Kubota Hitoshi
Oda Hideaki
Butler Douglas C.
Nissan Motor Company Limited
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