Methods and systems are provided for providing vacuum to a brake booster via an aspirator system. In one example, a system may include an aspirator system fluidly coupled with a brake booster with no intervening components located therebetween.

The invention relates to a brake booster (10) for a motor vehicle brake system, comprising a force input member (12) that is or can be coupled to a brake pedal and can be moved along a movement axis (V), a control valve (14) that can be actuated according to a movement of the force input member (12), a chamber arrangement (20) that is disposed in a booster housing (18), can be controlled by the control valve (14), and is provided with at least one negative-pressure chamber (28, 30) and at least one working chamber (24, 26) which are separated from each other by at least one movable wall (32, 34) coupled to the control valve (14), and a force output member (42) for applying a braking force to a downstream master brake cylinder arrangement. The control valve (14) is biased in a starting position along with the force output member (42) by means of a restoring spring (48), a first end of which rests on the control valve (14). According to the invention, the booster housing (18) includes a receiving opening (50) for the downstream master brake cylinder arrangement (58), said opening (50) being provided with at least one axial guiding section (56) and at least one radial stop section (54) which are designed to support a second end of the restoring spring (48).

The invention relates to a brake booster (10) for a motor vehicle brake system, comprising a force input member (12) that is or can be coupled to a brake pedal and can be moved along a movement axis (V), a control valve (14) that can be actuated according to a movement of the force input member (12), a chamber arrangement (20) that is disposed in a booster housing (18), can be controlled by the control valve (14), and is provided with at least one negative-pressure chamber (28, 30) and at least one working chamber (24, 26) which are separated from each other by at least one movable wall (32, 34) coupled to the control valve (14), and a force output member (42) for applying a braking force to a downstream master brake cylinder arrangement. The control valve (14) is biased in a starting position along with the force output member (42) by means of a restoring spring (48), a first end of which rests on the control valve (14). According to the invention, the booster housing (18) includes a receiving opening (50) for the downstream master brake cylinder arrangement (58), said opening (50) being provided with at least one axial guiding section (56) and at least one radial stop section (54) which are designed to support a second end of the restoring spring (48).

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.

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.

A vehicle having a valve stop mode control unit configured such that an intake valve and an exhaust valve are stopped in a closed state during rotation of an output shaft, supply of fuel to an engine is stopped, a clutch is made to be in an engaged state, and pistons are driven by rotational forces from driving wheels through the output shaft. When there is a request for valve stop inertial running, a negative pressure is supplied to an intake passage by a vacuum pump.