초록 ▼

A pneumatic brake booster (10) has a booster housing (12), the interior of which is subdivided by at least one movable wall (22) into a vacuum chamber (24) and a working chamber (26). Projecting into the booster housing (12) is a control valve (28) which, after a response force acting counter to its

A pneumatic brake booster (10) has a booster housing (12), the interior of which is subdivided by at least one movable wall (22) into a vacuum chamber (24) and a working chamber (26). Projecting into the booster housing (12) is a control valve (28) which, after a response force acting counter to its operating direction has been overcome, controls a pneumatic pressure difference acting upon the movable wall (22). The control valve (28) is operable both by means of a mechanical input element (36) and, independently thereof, by means of an electromagnetic arrangement (48) comprising a coil (58) and an armature (50), which are displaceable relative to one another along the operating direction. To reduce the response force which has to be overcome by a user, a device for detecting an operation of the control valve (28) effected by means of the mechanical input element (36) is provided which, once such an operation has been detected, during said operation prompts an energizing of the electromagnetic arrangement (48) of an intensity sufficient to reduce the response force of the control valve (28) yet not increase the braking force provided by the brake booster in accordance with the operation.

대표청구항 ▼

[ What is claimed is:] [1.]1. Pneumatic brake booster in particular for motor vehicles, havinga booster housing having an interior which is subdivided by at least one movable wall into a vacuum chamber and a working chamber,a control valve, which projects into the booster housing and, after a respon

[ What is claimed is:] [1.]1. Pneumatic brake booster in particular for motor vehicles, havinga booster housing having an interior which is subdivided by at least one movable wall into a vacuum chamber and a working chamber,a control valve, which projects into the booster housing and, after a response force acting counter to its operating direction has been overcome, controls a pneumatic pressure difference acting upon the movable wall and which is operable both by means of a mechanical input element and also, independently thereof, by means of an electromagnetic arrangement comprising a coil and an armature, which are displaceable relative to one another along the operating direction, anda device for detecting an operation of the control valve effected by means of the mechanical input element, characterized in that the device for detecting an operation of the control valve effected by means of the mechanical input element, once such an operation has been detected, during said operation prompts an energizing of the electromagnetic arrangement of an intensity sufficient to reduce the response force of the control valve yet not increase the braking force provided by the brake booster in accordance with the operation.