Fluid-pressure and analogous brake systems – Speed-controlled – Having a valve system responsive to a wheel lock signal
Patent
1997-03-07
1999-08-24
Schwartz, Chris
Fluid-pressure and analogous brake systems
Speed-controlled
Having a valve system responsive to a wheel lock signal
3031154, 303 842, 303DIG3, B60T 834
Patent
active
059416084
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 vehicle brakes. The fluid separator unit is preferably embodied as a piston having two working faces, each of the same diameter.
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"Electrohydraulic Brake System--The First Approach to Brake-By-Wire Technology" by Jonner et al., SAE Technical Paper Series #960991, copyright 1996 Society of Automotive Engineers, Inc.
"Intelligent Braking for Current and Future Vehicles" by Schenk et al., SAE Technical Paper Series #950762, copyright 1995 Society of Automotive Engineers, Inc.
Campau Gregory P.
Ferger Robert L.
Ganzel Blaise J.
Kingston Andrew W.
Luckevich Mark S.
Kelsey-Hayes Company
Schwartz Chris
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