Electrically actuatable vehicle brake and method for controlling an electrically actuatable vehicle brake
First Claim
1. An electrically actuatable vehicle brake, said vehicle brake comprising:
- a brake piston acting on at least one friction lining, said brake piston displaceable out of an initial position into an actuation position, wherein in said actuation position, said brake piston urges said friction lining against a rotating member of said vehicle brake which can be connected, fixed against relative rotation, to a wheel of a motor vehicle, and wherein said brake piston is actuatable by an element of a transmission unit driven by an electric motor and acting on the brake piston; and
a device for releasably holding said brake piston in said initial position, such that a predetermined brake release play is kept constant, wherein said brake release play is defined by at least a distance between said at least one friction lining and said rotating member when said brake piston is in said initial position;
wherein said electric motor can be triggered by an electronic control unit, said electronic control unit being set up to detect performance parameters of at least one of said vehicle, said electric motor, and said vehicle brake, and further being set up and programmed to trigger said electric motor by means of a control and evaluation program running in said electronic control unit in such a way that to calibrate said brake, said element is displaced in response to the detection of at least one predetermined operating condition in a first direction into said actuation position, and then, said element is displaced in a second direction opposite said first direction, along a path the length of which corresponds to a sum of the predetermined brake release play and a predetermined distance between said element and said brake piston when said brake is not actuated; and
wherein the electronic control unit is set up to trigger the electric motor in such a way that the element of the transmission unit acting on the brake piston is displaced into a predetermined zero position before being displaced into its actuation position and the electronic control unit is further set up to detect a dimension value which is correlated to the length of a path covered by the element between its zero position and its actuation position and to compare the detected dimension value with a stored reference dimension value, the reference dimension value being correlated to the length of a path covered by the element in a vehicle brake fitted with new friction linings.
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Accused Products
Abstract
An electrically driven vehicle brake comprises a brake piston, which acts on at least one friction lining and can be displaced out of an initial position into an actuation position, in which the brake piston abuts the friction lining against a rotating member of the vehicle brake which is to be connected, fixed against rotation, to a wheel of the motor vehicle, and a transmission unit, driven by an electric motor and acting on the brake piston to actuate the brake piston, wherein the electric motor is to be triggered by an electronic control unit, which is also set up to detect performance parameters of the vehicle, the electric motor and/or the vehicle brake. The electronic control unit is set up and programmed to trigger the electric motor by means of a control and evaluation program running in it in such a way that the brake piston is displaced in response to the detecting of at least one predetermined operating condition in a first direction into its actuation position, in which the at least one friction lining abuts against the rotating member, and the brake piston is then displaced by a path corresponding to a predetermined, desired brake release play in a second direction opposite the first direction, into its initial position. If the vehicle brake additionally comprises a device for fixing the initial position of the brake piston, which fixes the initial position of the brake piston in such a way that a predetermined, desired brake release play is kept constant during the operating life of the brake, the electronic control unit is set up and programmed to trigger the electric motor by means of a control and evaluation program running in it in such a way that an element of the transmission unit acting on the brake piston on electrical actuation of the brake is displaced in response to the detecting of at least one predetermined operating condition in a first direction into its actuation position, in which the brake piston actuated by the element abuts the at least one friction lining against the rotating member. The element is then displaced by a path corresponding to a sum made up of the predetermined, desired brake release play and a predetermined, desired distance between the element and the brake piston when the brake is not actuated in a second direction opposite the first direction into its initial position.
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Citations
18 Claims
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1. An electrically actuatable vehicle brake, said vehicle brake comprising:
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a brake piston acting on at least one friction lining, said brake piston displaceable out of an initial position into an actuation position, wherein in said actuation position, said brake piston urges said friction lining against a rotating member of said vehicle brake which can be connected, fixed against relative rotation, to a wheel of a motor vehicle, and wherein said brake piston is actuatable by an element of a transmission unit driven by an electric motor and acting on the brake piston; and a device for releasably holding said brake piston in said initial position, such that a predetermined brake release play is kept constant, wherein said brake release play is defined by at least a distance between said at least one friction lining and said rotating member when said brake piston is in said initial position; wherein said electric motor can be triggered by an electronic control unit, said electronic control unit being set up to detect performance parameters of at least one of said vehicle, said electric motor, and said vehicle brake, and further being set up and programmed to trigger said electric motor by means of a control and evaluation program running in said electronic control unit in such a way that to calibrate said brake, said element is displaced in response to the detection of at least one predetermined operating condition in a first direction into said actuation position, and then, said element is displaced in a second direction opposite said first direction, along a path the length of which corresponds to a sum of the predetermined brake release play and a predetermined distance between said element and said brake piston when said brake is not actuated; and wherein the electronic control unit is set up to trigger the electric motor in such a way that the element of the transmission unit acting on the brake piston is displaced into a predetermined zero position before being displaced into its actuation position and the electronic control unit is further set up to detect a dimension value which is correlated to the length of a path covered by the element between its zero position and its actuation position and to compare the detected dimension value with a stored reference dimension value, the reference dimension value being correlated to the length of a path covered by the element in a vehicle brake fitted with new friction linings. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for controlling an electrically actuatable vehicle brake, the method comprising:
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providing a brake piston acting on at least one friction lining, said brake piston displaceable out of an initial position into an actuation position, wherein in said actuation position, said brake piston urges said friction lining against a rotating member of said vehicle brake which can be connected, fixed against relative rotation, to a wheel of a motor vehicle, and wherein said brake piston is actuatable by an element of a transmission unit driven by an electric motor and acting on the brake piston; providing a device for releasably holding said brake piston in said initial position, such that a predetermined brake release play is kept constant, wherein said brake release play is defined by at least a distance between said at least one friction lining and said rotating member when said brake piston is in said initial position, wherein said electric motor can be triggered by an electronic control unit, said electronic control unit being set up to detect performance parameters of at least one of said vehicle, said electric motor, and said vehicle brake; determining a desired distance between said element of said transmission unit acting on said brake piston, and said brake piston when said brake is not actuated; detecting at least one predetermined operating condition; calibrating said brake, said calibrating step including displacing said element in a first direction into said actuation position in response to the detection of said at least one predetermined operating condition; displacing said element in a second direction opposite said first direction, along a path the length of which corresponds to a sum of the predetermined brake release play and said predetermined distance between said element and said brake piston when the brake is not actuated; displacing the element of the transmission unit acting on the brake piston into a predetermined zero position before the element is displaced into its actuation position; detecting a dimension value which is correlated to the length of a path covered by the element between its zero position and its actuation position; and comparing the detected dimension value with a stored reference dimension value which is correlated to the length of a path covered by the element in a vehicle brake fitted with new friction linings. - View Dependent Claims (18)
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Specification