Electrohydraulic motor vehicle brake system and method for operating the same
First Claim
1. A method for operating an electrohydraulic motor vehicle brake system having a cylinder-piston arrangement supplied with hydraulic fluid from a reservoir, an electromechanical actuator for actuating a piston accommodated in the cylinder-piston arrangement, a wheel brake coupled to the cylinder-piston arrangement, and a shut-off valve provided between the cylinder-piston arrangement and the wheel brake, comprising the ordered sequence of steps of:
- activating the electromechanical actuator to actuate a piston of the cylinder-piston arrangement that generates a hydraulic pressure at the wheel brake;
activating the shut-off valve to lock the hydraulic pressure already generated at the wheel brake;
activating the electromechanical actuator to actuate the piston to intake hydraulic fluid from the reservoir while monitoring a temporal behaviour of a pressure drop in the cylinder-piston arrangement that accompanies the intake; and
terminating the intake dependent on a result of the monitoring.
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Accused Products
Abstract
The invention relates to a technique for operating an electrohydraulic motor vehicle brake system comprising a master cylinder (or any other cylinder-piston arrangement) that can be supplied with a hydraulic fluid from a reservoir, an electromechanical actuator for actuating a piston accommodated in the master cylinder, a wheel brake that can be coupled to the master cylinder, and a stop valve provided between the master cylinder and the wheel brake. According to an aspect of this technique, the method comprises the steps of: controlling the electromechanical actuator to build up hydraulic pressure on the wheel brake; controlling the stop valve to hold the hydraulic pressure already built up on the wheel brake; controlling the electromechanical actuator to take in hydraulic fluid from the reservoir while monitoring a time response of a pressure drop in the master cylinder associated with the take-in; and interrupting the take-in depending on a result of the monitoring.
41 Citations
17 Claims
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1. A method for operating an electrohydraulic motor vehicle brake system having a cylinder-piston arrangement supplied with hydraulic fluid from a reservoir, an electromechanical actuator for actuating a piston accommodated in the cylinder-piston arrangement, a wheel brake coupled to the cylinder-piston arrangement, and a shut-off valve provided between the cylinder-piston arrangement and the wheel brake, comprising the ordered sequence of steps of:
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activating the electromechanical actuator to actuate a piston of the cylinder-piston arrangement that generates a hydraulic pressure at the wheel brake; activating the shut-off valve to lock the hydraulic pressure already generated at the wheel brake; activating the electromechanical actuator to actuate the piston to intake hydraulic fluid from the reservoir while monitoring a temporal behaviour of a pressure drop in the cylinder-piston arrangement that accompanies the intake; and terminating the intake dependent on a result of the monitoring. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An electrohydraulic motor vehicle brake system, comprising:
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a cylinder-piston arrangement that can be supplied with hydraulic fluid from a reservoir; an electromechanical actuator for actuating a piston accommodated in the cylinder-piston arrangement; a wheel brake that can be coupled to the cylinder-piston arrangement; a shut-off valve provided between the cylinder-piston arrangement and the wheel brake; and an electronic control unit or electronic control unit system which is configured to perform the ordered sequence of steps to; activate the electromechanical actuator for generating a hydraulic pressure at the wheel brake; activate the shut-off valve for locking the hydraulic pressure already generated at the wheel brake; activate the electromechanical actuator for an intake of hydraulic fluid from the reservoir while monitoring a temporal behaviour of a pressure drop in the cylinder-piston arrangement that accompanies the intake; and terminate the intake dependent on a result of the monitoring step. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification