Motor vehicle hydraulic braking system
AssigneeITT Manufacturing Enterprises, Inc.
InventorKarlheinz Bill
Life of this patent
Estimating the term…
Abstract
The present invention discloses a brake system for automotive vehicles including a vacuum brake power booster which is operable preferably by a solenoid irrespective of the actuation by the driver. In order to sense the actuating speed during actuation introduced at a brake pedal by the driver, the present invention provides a travel sensor of proportional operation which is operable by the axial movement of the movable wall of the vacuum brake power booster, and the output signal of the travel sensor is directly proportional to the actuating travel of the movable wall and is subjected to a time differentiation processing operation in an electronic control unit.
Claims17
A vacuum power booster with an actuating rod adapted to be connected to an actuating pedal, comprising:
- a housing, a sensor device for sensing the speed of a booster actuation, and
- an electronic control unit providing output signals which permit activating a pneumatic valve, in order to control the build-up of a pneumatic differential pressure in the housing of the vacuum brake power booster, irrespective of the operation of the rod, wherein the sensor device is configured as a travel sensor of proportional operation which is operable by a movement of a movable wall of the vacuum brake power booster, the output signal of the travel sensor being directly proportional to the actuating travel of the movable wall and being subjected to a time differentiation processing operation in the electronic control unit,
- wherein an electric switching device is arranged in a control housing accommodating the control valve to detect whether the control valve is operated by the rod.
A hydraulic brake system for automotive vehicles including an actuating unit comprising a master brake cylinder with pressure chambers and a preceding vacuum brake power booster operable by a brake pedal,
- wheel brakes which are connected to the pressure chambers of the master brake cylinder by the intermediary of an ABS-hydraulic unit,
- an electric switching device which permits identification of a pedal-actuated braking operation,
- a sensor device for sensing the brake pedal actuating speed, and
- an electronic control unit which is furnished with output signals of a brake light switch, the electric switching device and the sensor device, and providing output signals which permit activating a pneumatic valve controlling the build-up of a pneumatic differential pressure in the housing of the vacuum brake power booster, irrespective of the operation of the brake pedal, to the effect of full braking, wherein the sensor device is configured as a travel sensor of proportional operation which is operable by the axial movement of a movable wall of the vacuum brake power booster, the output signal of the travel sensor being directly proportional to the actuating travel of the movable wall and being subjected to a time differentiation processing operation in the electronic control unit,
- wherein the electric switching device is arranged in a control housing accommodating the control valve.
A vacuum power booster with an actuating rod adapted to be connected to an actuating pedal,
- including a housing and a sensor device for sensing the speed of a booster actuation, and
- an electronic control unit providing output signals which permit activating a pneumatic valve, in order to control the build-up of a pneumatic differential pressure in the housing of the vacuum brake power booster, irrespective of the operation of the rod, wherein the sensor device is configured as a travel sensor of proportional operation which is operable by a movement of a movable wall of the vacuum brake power booster, the output signal of the travel sensor being directly proportional to the actuating travel of the movable wall and being subjected to a time differentiation processing operation in the electronic control unit,
- wherein the electronic control unit has a means which permits a continuous calibration of the travel sensor,
- wherein the electronic control unit has a means which permits identifying the calibration performed.
Dependencies are inferred from the claim text.