Method for monitoring and controlling hydraulic brake slip control devices supplied with energy from an external source, and an apparatus for implementing this method

US4523791A · kind A · utility

Assignee

• ITT Industries · US

Inventors

• Juan Belart · Walldorf, DE
• Jochen Burgdorf · Mühlheim am Main, DE
• Dieter Kircher · Frankfurt am Main, DE
• Hans-Wilhelm Bleckmann · Prüm, DE
• Lutz Weise · Mainz, DE

Key dates

• Filing date: Jul 15, 1983
• Grant date: Jun 18, 1985
• Expiry date: Jul 15, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S303/04
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

To monitor and control hydraulic brake slip control devices supplied with energy from an external source and intended for use on motor vehicles equipped with several brake circuits, a check is kept on the fluid level in the reservoir holding the hydraulic fluid and on the pressure in the chambers supplied with the external energy. When the fluid level drops, which is detected by a reservoir level warning device, or when the pressure drops causing pressure warning switches to respond, the brake slip control will be only partially deactivated initially by halting the reduction in pressure in the static brake circuits and inhibiting the dynamic fluid flow into the static brake circuits. The dynamic brake circuit will continue to allow a controlled deceleration of the connected wheels. The partial deactivation will be initiated immediately or with a time delay or only if the error signals continue to be present beyond a predetermined period of time. Depending on the duration of the error signals or following the lapse of a predetermined period of time, the brake slip control will be deactivated fully or, if the error signals cease, the partial deactivation will be cancelled.