Hydraulic pressure control apparatus having device for estimatin

Details Hydraulic pressure control apparatus having device for estimatin Hydraulic pressure control apparatus having device for estimatin

1997-04-29

1999-11-30

Le, Mark T.

Fluid-pressure and analogous brake systems

Speed-controlled

Odd condition or device detection

303 10, B60T 800

Patent

active

059929529

ABSTRACT:
A hydraulic pressure control apparatus for a brake including a brake cylinder activated by a pressurized fluid for braking a wheel of a vehicle, a reservoir for storing the fluid discharged from the brake cylinder, and a pump for pumping up the fluid from the reservoir, the apparatus including a pressure control device which discharges the fluid from the brake cylinder, into the reservoir, to reduce a pressure of the fluid in the brake cylinder, and supplies the fluid pumped up from the reservoir, to the brake cylinder, to increase the pressure of the fluid in the brake cylinder, a reservoir fluid amount estimating device for estimating a cumulative amount of flow of the fluid from the brake cylinder into the reservoir and a cumulative amount of flow of the fluid out of the reservoir, and estimating an amount of the fluid stored in the reservoir on the basis of the estimated cumulative amount of flow of the fluid into the reservoir and the estimated cumulative amount of flow of the fluid out of the reservoir; and an estimated fluid amount changing device for changing the estimated reservoir fluid amount provided by the reservoir fluid amount estimating device, to a predetermined value, when an operating state of the hydraulic pressure control apparatus satisfies a predetermined condition during an operation of the pressure control device to control the pressure of the fluid in the brake cylinder.

REFERENCES:
patent: 5538334 (1996-07-01), Kushi et al.
patent: 5558414 (1996-09-01), Kubota
patent: 5641209 (1997-06-01), Kushi et al.
patent: 5683149 (1997-11-01), Arizawa et al.

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