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US 5,669,673 AGranted
Direct power booster response system
AssigneeGeneral Motors Corporation
InventorDavid Fredrick Reuter
Life of this patent
Estimating the term…
Abstract
An integral power booster and master cylinder assembly interactively operates with a braking system to effect conventional braking operation, anti-lock brake operation, traction control operation and stability enhancement system functions in a cost effective manner. The incorporation of a low pressure hydraulic booster provides a manner of enhancing first cycle response times of the traction control and stability enhancement system functions. Fluid separation is maintained between the stability enhancement system and the braking channels through the use of a pump priming accumulator to provide a pre-charge to the wheel brake pressure effecting pump assembly, in direct response to the power booster.
Claims15
A direct power booster response system comprising:
- a power booster including an accumulator having a fluid chamber and including a longitudinal bore containing a charged chamber, the charged chamber of the longitudinal bore continuously communicating with the fluid chamber of the accumulator;
- a wheel brake actuable at a rate dependent upon fluid pressure;
- a master cylinder operatively engaging the power booster and selectively operable to generate fluid pressure to actuate the wheel brake;
- a first conduit extending from the master cylinder to the wheel brake wherein the wheel brake is actuatable by the master cylinder through the first conduit;
- a first pump interconnected with the charged chamber of the longitudinal bore operable to maintain a fluid charge in the fluid chamber of the accumulator;
- a second conduit extending between the first pump and the wheel brake wherein the rate at which the wheel brake is actuated is increased in direct response to a transfer of the fluid charge through the second conduit.
3 more elements
A direct power booster response system comprising:
- a fluid reservoir;
- a power booster including an accumulator having a fluid chamber and including a longitudinal bore containing a charged chamber, the charged chamber of the longitudinal bore continuously communicating with the fluid chamber of the accumulator, and the power booster including a power chamber selectively communicating with the fluid chamber of the accumulator wherein a power piston is disposed in the longitudinal bore separating the power chamber from a chamber that is in continuously open fluid communication with the reservoir;
- a master cylinder operatively engaging the power booster and selectively manually operable to actuate the wheel brake with power assist from the booster by opening communication between the charged chamber of the accumulator and the power chamber;
- a wheel brake actuable at a rate dependent upon fluid pressure;
- a first conduit extending from the master cylinder to the wheel brake wherein the wheel brake is actuatable by the master cylinder through the first conduit;
- a first pump interconnected with the charged chamber of the longitudinal bore operable to maintain a fluid charge in the fluid chamber of the accumulator;
- a second conduit extending between the first pump and the wheel brake wherein the rate at which the wheel brake is actuated is increased in direct response to a transfer of the fluid charge through the second conduit.
4 more elements
A direct power booster response system comprising:
- a fluid reservoir;
- a power booster including an accumulator having a fluid chamber and including a longitudinal bore containing a charged chamber, the charged chamber of the longitudinal bore continuously communicating with the fluid chamber of the accumulator, and the power booster including a power chamber selectively communicating with the fluid chamber of the accumulator wherein a power piston is disposed in the longitudinal bore separating the power chamber from a chamber that is in continuously open fluid communication with the reservoir, and the power booster having an accumulator port opening into the charged chamber;
- a master cylinder operatively engaging the power booster and selectively manually operable to actuate the wheel brake with power assist from the booster by opening communication between the charged chamber of the accumulator and the power chamber;
- a wheel brake actuable at a rate dependent upon fluid pressure;
- a first conduit extending from the master cylinder to the wheel brake wherein the wheel brake is actuatable by the master cylinder through the first conduit;
- a first pump interconnected with the charged chamber of the longitudinal bore by connection to the accumulator port the first pump being operable to maintain a fluid charge in the fluid chamber of the accumulator by communicating with the fluid chamber of the accumulator through the accumulator port and the charged chamber so that the fluid chamber and the charged chamber are maintained at a substantially identical fluid pressure level;
- a second conduit extending between the first pump and the wheel brake wherein the rate at which the wheel brake is actuated is increased in direct response to a transfer of the fluid charge through the second conduit.
4 more elements
Dependencies are inferred from the claim text.