Method for operating a brake component, brake component, brake system and vehicle

Abstract

Method for operating a brake component, in particular a brake booster device and / or a brake pressure generator, wherein in a first method step it is detected that the brake component has fallen below a first temperature value, wherein in a second method step a warm-up phase of the brake component is started, wherein in a third method step it is detected that the brake component has exceeded a second temperature value and the warm-up phase is ended.

Description

The present invention relates to a method for operating a brake component, a brake component, a brake system and a vehicle.Prior ArtDE 10 2018 206 079 A1 relates to a multi-circuit, hydraulically open brake system, in particular for a highly automated or autonomous vehicle.WO 2020 165 296 A1 relates to a brake system for a vehicle, which has at least one pressure supply device which is connected to a brake circuit via a hydraulic line.WO 2021 160 298 A1 relates to a fail-safe brake system.DE 10 2021 104 249 A1 relates to a brake system and a method for braking a vehicle.Disclosure of the InventionThe core of the invention in the method for operating a brake component, in particular a brake booster device and / or a brake pressure generator, is that it is detected in a first method step that the brake component has fallen below a first temperature value, wherein a warm-up phase of the brake component is started in a second method step, wherein it is detected in a third method step that the brake component has exceeded a second temperature value, and the warm-up phase is ended.The background of the invention is that the availability and reliability of the brake component is improved at low ambient temperatures.Advantageously, the brake component is a hydraulic brake component.Further advantageous embodiments of the present invention are the subject matter of the dependent claims.According to an advantageous embodiment, a piston of the brake component is moved during the warm-up phase, in particular wherein no driver braking request is present. As a result, a hydraulic fluid in the brake component is compressed and / or the temperature of the brake component is increased by mechanical movement.It is advantageous here if a defined actuator position and / or a defined motor torque and / or a defined motor force and / or a defined brake pressure is set. In this case, the actuator position and / or the motor torque and / or the motor force and / or the brake pressure is selected such that the normal operation of the brake component and / or of a brake system remains unaffected.It is furthermore advantageous if it is detected whether a vehicle having the brake component is in motion or at a standstill. As a result, movement parameters of the piston, in particular an actuator position and / or an engine torque and / or an engine force and / or a brake pressure, can be selected such that the vehicle remains unaffected by the warming-up phase and at the same time efficient warming of the brake component is achieved.It is advantageous if, if the warming phase has been started at standstill, the warming phase is ended as soon as a movement of the vehicle is detected. The vehicle thus remains unaffected by the warm-up phase and at the same time efficient heating of the brake component is achieved.It is furthermore advantageous if, when the warming-up phase is carried out with a moving vehicle, the piston is moved in such a way that no brake pressure is built up. As a result, the warming phase can also be carried out with a moving vehicle without the movement of the vehicle being impaired.It is advantageous if the piston is moved into a position in which ventilation bores of a piston cylinder are open for the piston. Thus, fluid may flow past the piston out of the piston cylinder.Alternatively or additionally, valves connected to the brake component can be controlled in such a way that no brake pressure is built up.The temperature of the brake component is advantageously determined by means of a temperature sensor on the brake component and / or by means of a temperature model as a function of an ambient temperature and / or a geographical position and / or by means of a temperature of another brake component. In this case, a time delay, for example due to a signal transmission or heating of the brake component, is advantageously taken into account when activating the warming phase.The core of the invention in the case of the brake component is that the brake component can be operated by means of a method as described above or according to one of the claims relating to the method.The background of the invention is that the availability of the brake component at low ambient temperatures is improved.The essence of the invention in the brake system is that the brake system has a brake component as described above or according to the claim related to the brake component.The background of the invention is that the availability of the brake system is improved at low ambient temperatures.The essence of the invention in the vehicle is that the vehicle has a brake component as described above or according to the claim related to the brake component and / or a brake system as described above or according to the claim related to the brake system.The background of the invention is that the safety of the vehicle at low ambient temperatures is improved.The above embodiments and developments can be combined with one another as desired, if appropriate. Further possible embodiments, developments and implementations of the invention also include combinations of features of the invention described above or below with respect to the exemplary embodiments, which combinations are not explicitly mentioned. In particular, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the present invention.BRIEF DESCRIPTION OF THE DRAWINGIn the following section, the invention is explained on the basis of exemplary embodiments from which further inventive features can arise, to which the invention is, however, not limited in its scope. The exemplary embodiments are illustrated in the drawings.The following are shown: FIG. 1 shows a position d of an actuator of a hydraulic brake component as a function of time t during the method according to the invention for activating a hydraulic brake component, and FIG. 2 shows a schematic flow diagram of the method 100 according to the invention.FIG. 1 shows a time profile of a position of an actuator of a hydraulic brake component during the method 100 according to the invention for operating a brake component.The hydraulic brake component is, for example, a brake booster device and / or a brake pressure generator.At a first time t 1, it is determined that the brake component and / or a hydraulic fluid has fallen below a critical first temperature value.For this purpose, the temperature of the brake component is detected by means of a temperature sensor on the brake component. Alternatively, the temperature of the brake component can be determined by means of a temperature model as a function of an ambient temperature and / or a geographical position and / or by means of a temperature of another brake component. This determination can be carried out by an internal or external control device, for example by means of a cloud which can access temperature databases. In this case, it is taken into account that the temperature of the brake component follows or leads in time the temperature determined by means of the temperature model or the temperature of the other brake component. Furthermore, a transmission duration of the data is taken into account.At a second time t 2, a warm-up phase of the brake component is started. In this case, the brake component itself can have detected the temperature drop below and activate the warm-up phase. Alternatively, a start command for the warm-up phase is sent via a bus system connected to the brake component and received by the brake component. Further components of a brake system are informed that a warm-up phase is being carried out, in particular wherein no driver braking request is present.During the warm-up phase, a piston of the brake component is moved, in particular back and forth, between a first position d 1 and a second position d 2 without the need for a driver's braking request. In this case, a defined actuator position and / or a defined engine torque and / or a defined engine force and / or a defined brake pressure can be set.It is taken into account whether a vehicle having the brake component is in motion or at a standstill.In movement, the first position d 1 and the second position d 2 are selected such that no brake pressure is built up in a brake circuit. For example, the piston is moved into a position in which ventilation bores of a piston cylinder are open for the piston. Additionally or alternatively, valves of the brake system can be controlled in such a way that no brake pressure is built up in a brake circuit.If the warming phase is started at standstill, the warming phase can be terminated as soon as a movement of the vehicle is detected.At a third point in time t 3, when the brake component has exceeded a second temperature value, the warm-up phase is ended. A piston of the brake component is moved back to a neutral position or original position. The second temperature value is greater than or equal to the first temperature value.At a fourth time t 4, the piston has reached the neutral position or original position again. The method 100 is ended.FIG. 2 shows the method 100 according to the invention as a flow diagram.In a first method step 101, the brake component detects a first temperature value from being undershot.In a second method step 102, a warm-up phase of the brake component is started.In a third method step 103, an exceeding of a second temperature value by the brake component is detected and the warm-up phase is ended.A vehicle is understood here to mean a land vehicle, for example a passenger car or a truck, or an aircraft or a watercraft, in particular an at least partially electrically driven vehicle.References included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedDE 10 2018 206 079 A1

[0002] WO 2020 165 296 A1

[0003] WO 2021 160 298 A1

[0004] DE 10 2021 104 249 A1

[0005]

Claims

Method (100) for operating a brake component, in particular a brake booster device and / or a brake pressure generator, characterized in that it is detected in a first method step (101) that the brake component has fallen below a first temperature value, wherein a warm-up phase of the brake component is started in a second method step (102), wherein it is detected in a third method step (103) that the brake component has exceeded a second temperature value, and the warm-up phase is ended.Method (100) according to Claim 1, characterized in that during the warm-up phase a piston of the brake component is moved, in particular wherein no driver braking request is present.Method (100) according to Claim 2, characterized in that a defined actuator position and / or a defined engine torque and / or a defined engine force and / or a defined brake pressure is set.Method (100) according to one of the preceding claims, characterized in that it is detected whether a vehicle having the brake component is in motion or at a standstill.Method (100) according to Claim 4, characterized in that, if the warm-up phase has been started at standstill, the warm-up phase is ended as soon as a movement of the vehicle is detected.Method (100) according to Claim 4, characterized in that, if the warming-up phase is carried out with a moving vehicle, the piston is moved in such a way that no brake pressure is built up.Method (100) according to claim 6, characterized in that the piston is moved into a position in which aeration bores of a piston cylinder are open for the piston.Method (100) according to Claim 6 or 7, characterized in that valves connected to the brake component are actuated in such a way that no brake pressure is built up.Method (100) according to one of the preceding claims, characterized in that the temperature of the brake component is determined by means of a temperature sensor on the brake component and / or by means of a temperature model as a function of an ambient temperature and / or a geographical position and / or by means of a temperature of another brake component.Brake component, characterized in that the brake component can be operated by means of a method according to one of the preceding claims.A braking system comprising a brake component according to claim 10.Vehicle having a brake component according to Claim 10 and / or a brake system according to Claim 11.

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