Robert Boschgmbh

Mark Lacosse

Walter Last

William G Grace

Charles Horner

Amy Backhus

Steve E Villaire

William Grace

A vehicle brake booster includes a brake input member configured to receive a braking input force and a booster housing divided into a first chamber adjacent the brake input member and a second chamber remote from the brake input member. A poppet valve includes a poppet valve body and a poppet seal, the poppet valve operable to maintain separation between pressure and vacuum during assisted braking and further being operable to enable evacuation of the air from the first chamber through one or more side ports of the poppet valve body upon release of the braking input force and completion of the assisted braking A restrictor element provides a predetermined release speed for the booster. The one or more side ports define a total flow resistance of the poppet valve body which is less than an effective total flow resistance of the poppet valve body set by the restrictor element.

Brake booster with tunable release

Plunger connector

A brake booster having a housing is separated into a first chamber and a second chamber by a wall connected to a hub. The hub has a cylindrical body with an axial bore that retains a control valve for sequentially connecting the first chamber with the second chamber to provide for the equalization of fluid pressure therein to define a first mode of operation and interrupting communication between the first and second chambers while connecting the second chamber to a surrounding environment to allow air to enter into the second chamber and create a pressure differential across the wall to defining a second mode of operation. The pressure differential acts on the wall to develop an output force that pressurize fluid to effect a brake application. The brake booster is characterized by a first input member responsive to a manual input and a second input member responsive to an ECU for moving the control valve from the first mode to the second mode to respectively develop first and second brake applications. A switch carried by the hub is activated during the second brake application to provide the ECU with a first signal confirming the development of the second brake application while an input force applied to the first input member deactivates the switch and provides the ECU with a second signal to terminate the second brake application and place the development of first brake application under the control of an operator.

Brake booster

Growing community of inventors

Granger, IN, United States of America

Mark Lacosse