Electronic brake management system with manual fail safe

USRE44677E1 · kind E1 · reissue

Assignee

• KELSEY-HAYES-COMPANY · US

Inventors

• Gregory P. Campau · Livonia, US
• Andrew W. Kingston · Rhens, DE
• Robert L. Ferger · Homburg, DE
• Thomas Weigert · Pocking, DE
• Salvatore Oliveri · Filsen, DE
• Blaise J. Ganzel · Ann Arbor, US
• Mark S. Luckevich · Ann Arbor, US

Key dates

• Filing date: Aug 24, 2001
• Grant date: Dec 31, 2013
• Expiry date: Aug 24, 2021

Classification

• Technology area (CPC —): General

Abstract

An improved electro-hydraulic brake system having features for improving the pedal feel of the system, while further having design features which contribute to the economy of manufacture of certain components of the system. The system provides for an electrically powered normal source of pressurized hydraulic brake fluid, and a manually powered backup source of pressurized hydraulic brake fluid to the vehicle brakes in the event of failure of the normal source. During normal braking, fluid from the backup source is redirected from the vehicle brakes to a pedal simulator. The pedal simulator preferably includes arrangements of spring loaded pistons, expansion volumes, and damping orifices, together with valves selectively controlling the flow of fluid to and from the pedal simulator which provides for an improved pedal feel during vehicle braking. The brake system of the invention further includes a relatively low cost fluid separator unit which is provided which prevents intermixing of pressurized fluid between the backup source and the normal source. The fluid separator unit acts to permit the normal source to act upon the hydraulic brake fluid of the backup source to operate the …