Power-assisted brake system
AssigneeRobert Bosch GmbH
InventorAlain Gaillard
Life of this patent
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Abstract
A power-assisted brake system which can be activated by a pedal including a travel simulator and a desired value transmitter which is coupled thereto and a second sensor which can be used alternatively as a desired value transmitter. The second desired value transmitter is a pressure transmitter. The signals of both desired value transmitters are monitored in an electronic control unit for essentially corresponding signal values. If there is an unacceptable difference in signal value, power-assisted braking operation is suppressed. Braking is then possible by an emergency brake cylinder. The power-assisted brake system can be used for motor vehicles for passenger transport and goods transport, in motor vehicles which are equipped with an anti-lock brake system (ABS) or with a traction control system (TCS).
Claims20
A power-assisted brake system having a valve arrangement which is controlled electrically by means of a pedal, for adjusting wheel brake pressures which are derived from a power-assistance pressure source, a travel simulator which is assigned to the pedal and an emergency brake cylinder which is activated by means of the pedal and at least one piston remains in a region of an initial position during braking with power assistance, from which initial position, an emergency brake pressure is produced during a working stroke of the piston and is fed to wheel brakes through at least one emergency brake line, a cylinder (38) includes a locking, piston (35) which is displaced therein and arranged between the pedal (1) and a piston (36) which is constructed as a pressure rod piston, an emergency piston-side locking chamber (41) is connected to a reservoir (10) via a first 2/2-way solenoid valve (43) which is closed during a power-assistance mode, and wherein the 2/2-way solenoid valve (43) is open in an emergency operation and connects the locking chamber (41) to the reservoir (10).
Dependencies are inferred from the claim text.