Fluid-pressure and analogous brake systems – Load control – Responsive to fluid pressure spring
Patent
1985-07-30
1987-05-12
Reger, Duane A.
Fluid-pressure and analogous brake systems
Load control
Responsive to fluid pressure spring
303DIG3, 303 6C, B60T 818, B60T 830
Patent
active
046644520
ABSTRACT:
A brake control system has a proportioning valve for controlling distribution of fluid pressure to at least rear wheel cylinders with respect to the fluid pressure built-up in a master cylinder. The split point of the proportioning valve is variable depending upon load distribution between front and rear wheels and overall load applied on the vehicle. In order to perform braking pressure distribution control, a controller is provided for setting set pressure for the proportioning valve, which set pressure defining the split point of the proportioning valve. The controller is connected to load sensors monitoring load condition at front part and rear part of the vehicle. The controller received front part load indicative signal and a rear part load indicative signal from the load sensors to derive load distribution and overall load on the vehicle, and whereby derives the set pressure of the proportioning valve. When the actual braking pressure is maintained lower than the set pressure, the controller maintains a proportioning valve device inactive to distribute hydraulic braking pressure built-up by a master cylinder to respective wheel cylinders so that the braking pressure in the wheel cylinders increases at a rate substantially corresponding to increasing rate of the fluid pressure in the master cylinder. On the other hand, when the actual braking pressure becomes equal to or higher than the set pressure, the controller makes the proportioning valve active to distribute the braking pressure to the wheel cylinders so that the braking pressure in the wheel cylinder increases at a controlled rate relative to the pressure increasing in the master cylinder.
REFERENCES:
patent: 4093316 (1978-06-01), Reinecke
patent: 4358163 (1982-11-01), Young
Kubota Hitoshi
Oda Hideaki
Nissan Motor Company Limited
Oberley Alvin
Reger Duane A.
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