Dynamic rear proportioning brake system

US5632535A · kind A · utility

Assignee

• KELSEY-HAYES-COMPANY · US

Inventors

• Mark S. Luckevich · Ann Arbor, US
• Mark R. Bielek · Wiesbaden, DE
• Dan Negrin · Wiesbaden, DE

Key dates

• Filing date: Aug 28, 1995
• Grant date: May 27, 1997
• Expiry date: Aug 28, 2015

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T8/1766
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A dynamic rear proportioning system is integrated with an existing vehicle anti-lock braking system (ABS) and performs the function of the rear brake pressure proportioning where ABS is not required. The rear brake hydraulic channel(s) are isolated from the master cylinder by activating the rear isolation valves, provided in the ABS, to provide the optimum brake force balance, regardless of vehicle loading, without the use of a load sensing mechanism. The system estimates vehicle and wheel deceleration, vehicle speed, and lateral acceleration as well as the rear wheel slip to dynamically control the rear brake force. By continually updating these control parameters, the system can further increase or decrease the rear brake pressure to maintain the optimum brake force balance throughout the braking maneuver.