Kelsey-hayes Company

Zf Active Safety US Inc.

Lucas Automotive Gmbh

Joseph F Zeoli

Blaise J Ganzel

Joseph A Starr

Thomas Wald

William P Caldwell

David Lopez-Larequi

Richard A Swarich

Georg Kedak

Robert I Girkin

Nick Stone

A braking system for a vehicle including front and rear wheels having wheel brakes includes a fluid displacement mechanism for supplying brake fluid to at least one of the wheel brakes. The fluid displacement mechanism includes a piston having a first position prior to braking and a second position for applying braking. A fluid accumulator is in fluid communication with the fluid displacement mechanism and stores brake fluid. A valve is in fluid communication with the fluid displacement mechanism and the accumulator and is configured to be closed while the piston moves from the second position towards the first position to prevent depletion of the accumulator.

Vehicle braking system

A pump attenuator bypass valve () is located at an outlet of a pump () in a vehicle braking system () between the pump () and an attenuator (). The attenuator bypass valve () includes a bypass valve housing (), a first fluid flow path (), and a second fluid flow path (). The first fluid flow path () is defined in the housing () and is configured to allow continuous flow of fluid when the pump () operates at a first pump flow rate. The second fluid flow path () is defined in the housing () and is configured to bypass the first fluid flow path () and to allow continuous flow of fluid when the pump () operates at a second pump flow rate higher than the first pump flow rate.

Pump attenuator bypass valve

A damping element for attenuating hydraulic pressure pulses is integrated into a hydraulic chamber of a motor vehicle hydraulic system. The damping element includes a end cap support body and a membrane that fits over a portion of the support body. The membrane has a first side facing towards a source of hydraulic fluid and a second side facing away from the hydraulic fluid source. At least one space is provided between the second side of the membrane and the end cap support body to allow for deformation of the membrane under hydraulic pressure. The membrane has a collar with a lip seal provided for fitting into place on the wall of the hydraulic chamber. At least one second space for receiving hydraulic fluid is defined between the lip seal and a region of the membrane opposite the lip seal.

Damping element for a motor vehicle hydraulic system

A vehicle braking system includes a slip control system operable in an electronic stability control (ESC) mode to automatically and selectively apply the brakes in an attempt to stabilize the vehicle when an instability condition has been sensed. The slip control system is further operable in an adaptive cruise control (ACC) mode to automatically apply the brakes to slow the vehicle in response to a control signal. The slip control system includes a variable speed motor drive piston pump for supplying pressurized fluid pressure to the brakes through a valve arrangement. In the ESC mode, the pump motor operates in an ESC speed range, and in the ACC mode, the pump motor operates in an ACC speed range lower than the ESC speed range. The slip control system further includes an attenuator connected to a pump outlet for dampening pump output pressure pulses prior to application to the brakes. The attenuator includes an elastomeric member located in an attenuator chamber of a housing. The attenuator chamber defines a shoulder and the elastomeric member includes a flange which rests on the shoulder and locates the elastomeric member in a predetermined axial position within the attenuator chamber. An outside wall of the elastomeric member includes circumferentially extending grooves defining ribs between adjacent grooves.

Attenuator for a vehicle braking system

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Livonia, MI, United States of America

Joseph F Zeoli