DE102021214000A1 - Brake control device for an electric or hybrid vehicle and a method for operating a brake control device for an electric or hybrid vehicle - Google Patents

Abstract

The present invention creates a brake control device (10) for an electric or hybrid vehicle (F), comprising a control device (SE) which is connected to a friction brake (RB) in the electric or hybrid vehicle (F) and to a guideway device (FE) of the Electric or hybrid vehicle (F) can be connected, wherein the control device (SE) is set up to operate the friction brake (RB) according to a predetermined operating scenario for the friction brake and the predetermined operating scenario relates to a rust or corrosion reduction or corrosion prevention of the friction brake, wherein the friction brake can be operated for a specified period of time and with a specified braking power and as a result corrosion and/or rust can be reduced or prevented on at least one brake element of the friction brake, the specified operating scenario being able to be determined based on a signal or on data from the guideway device (FE). or can be set up and can be carried out in addition to or instead of a recuperative braking process on the electric or hybrid vehicle (F).

Description

The present invention relates to a brake control device for an electric or hybrid vehicle and a method for operating a brake control device for an electric or hybrid vehicle.

State of the art

In vehicle braking units, rust or some form of corrosion can form on the friction elements. Brake discs on motor vehicles can corrode due to external influences, for example humidity, moisture, salt, snow or other influencing factors. For example, the formation of rust or corrosion can be favored with longer service lives and inactive phases of the friction element. If rust or corrosion is present, braking forces or a braking torque to be generated can be reduced compared to a rust-free or corrosion-free state of the friction element, for example if an equal pressure is generated between the brake lining and brake discs.

In addition to the stabilizing properties, for example in the form of classic ESP/ABS, current brake control systems contain increasingly expanded functional scopes such as support for the driver or the application of force to the brake pedal when the brake is actuated by an electromechanical brake booster or also assisting or partially assisting functions through a unit for active modulation of the brake hydraulic brake pressure (e.g. ESP, boost unit, etc.), without the active involvement of the driver. Another area of application for new brake control systems is what is known as blending during regenerative braking in electric or hybrid vehicles. The hydraulic volume, shifted by a brake modulation by the driver, is adjusted in such a way that the total deceleration value from the electrically regenerative brake and the friction brake can correspond to the driver's specification. In electric and hybrid vehicles, the friction brake is rarely activated by regenerative braking using an e-machine.

In the DE 10 2012 222 349 A1 discloses a method of preventing unwanted rust growth on vehicle brake discs.

Disclosure of Invention

The present invention provides a brake control device for an electric or hybrid vehicle according to claim 1 and a method for operating a brake control device for an electric or hybrid vehicle according to claim 6.

Preferred developments are the subject of the dependent claims.

Advantages of the Invention

The idea on which the present invention is based is to specify a brake control device for an electric or hybrid vehicle and a method for operating a brake control device for an electric or hybrid vehicle, a braking action being able to be carried out on a friction brake, by means of which rust and/or corrosion can be specifically prevented is removable on a braking element of the friction brake.

The underlying idea is that the susceptibility to rust and/or corrosion can be reduced by means of targeted brake actuations, for example due to moisture on the brake disc, if the vehicle is parked for longer than a predetermined period of time. Targeted friction brake actuation can remove or reduce the moisture.

According to the invention, the brake control device for an electric or hybrid vehicle comprises a control device which can be connected to a friction brake in the electric or hybrid vehicle and to a roadway device of the electric or hybrid vehicle, the control device being set up to activate the friction brake according to a predefined operating scenario for the to operate the friction brake and the specified operating scenario relates to a rust or corrosion reduction or corrosion prevention of the friction brake, wherein the friction brake can be operated for a specified period of time and with a specified braking power and corrosion and/or rust can thereby be reduced or prevented on at least one brake element of the friction brake is, wherein the predetermined operating scenario can be determined or set up based on a signal or on data from the guideway device and can be carried out in addition to or instead of a recuperative braking process on the electric or hybrid vehicle.

A boundary condition-dependent function is described that triggers a friction brake deceleration based on an a priori probability.

Targeted triggering of the friction brake before parking an electric or hybrid vehicle leads to a lower susceptibility to corrosion when stationary. Electric vehicles and hybrid vehicles rarely use the friction brake, so moisture can collect on it and this can lead to surface corrosion of the brake disc during a longer standstill phase .

A capability of active brake pressure modulation can therefore be provided by the brake control device.

The control device can be present separately in the vehicle and provided specifically for the brake control device, or a control device of a system present in the vehicle or used by the vehicle can also be used to operate the friction brake. The friction brake can include any type of friction brake, such as one or more brake discs with one or more brake pads.

The predefined operating scenario can be designed to generate a specific brake pressure on one (or more) specific wheel after or before a predefined time of inactivity of the friction brake.

The function can prevent rust and/or corrosion during inactivity, or at least reduce the risk of them developing. Moisture on the brake discs can lead to rust if the vehicle is parked for a long time. This can be avoided or reduced by targeted friction brake actuation before parking if it takes place before the vehicle is parked for a longer period of time.

Thus, in the case of prolonged inactivity and/or at the same time damp ambient conditions are known (and knowledge of them), a brake pressure can be increased compared to a short and/or dry inactive phase.

The guideway device can be designed to determine or estimate an environmental condition of the friction brake in the past, present and/or future and thus to estimate a degree of rust and/or corrosion formation in the present and/or future. The inactivity can be estimated and moisture can be avoided or reduced if the device is parked for a long time.

The route device can be a moisture sensor, a GPS system, another type of position determination sensor, a temperature sensor or other sensors. Weather conditions can be obtained through connectivity, such as high humidity, which can promote moisture accumulation on the brake disc, rainy weather, which can promote moisture accumulation on the brake disc, snowy weather, moisture or snow-covered roads, which can promote moisture accumulation on the brake disc .

By operating the friction brake to reduce or prevent rust and/or corrosion before shutting down (parking) the vehicle, the friction brake can advantageously operate the function of reducing rust and/or corrosion for the vehicle, for example outside of a main braking phase.

The brake control device can be used, for example, in 2-axle or multi-axle motor vehicles with a brake control system (e.g. ESP, IPB, etc.).

According to a preferred embodiment of the brake control device, the travel path device includes a brake pedal and the control device is set up to determine a driving and/or braking behavior of the driver and to take it into account in the specified operating scenario in order to guarantee a predetermined minimum degree of actuation of the friction brake.

The minimum degree of actuation of the friction brake can correspond to a minimum degree of actuation and moisture reduction before a longer shutdown.

The roadway device or the control device can be part of or even a driving stability system, such as an ESP system that can be suitable for braking individual wheels.

According to a preferred embodiment of the brake control device, the route device includes a position system and the control device is set up to estimate an environmental condition or a past or imminent standstill time of the electric or hybrid vehicle using data from the position system and for a developing and/or existing degree of rust and/or To close corrosion and to consider for the specified operating scenario.

According to a preferred embodiment of the brake control device, the route device comprises or is connected to a weather data server and the control device is set up to estimate humidity conditions at the location of the electric or hybrid vehicle using data from the weather data server and to indicate a developing and/or existing degree of rust and/or or corrosion and to take them into account in the specified operating scenario.

With the course of the roadway, the driving conditions and, for example, the associated weather conditions, it is advantageously possible to estimate the degree of risk of rust or corrosion formation on the friction brakes, particularly if this is for a period of time a previous inactivity of the friction brake is known.

According to a preferred embodiment of the brake control device, it can be connected to an electric machine of the electric or hybrid vehicle and is set up to combine regenerative braking with activating the friction brake in order to carry out the specified operating scenario and to cause a blend with the regenerative braking effect.

A probability of rust or corrosion formation on a respective friction brake can be determined by the guideway device and an associated brake pressure can be generated for a predetermined abrasion on the friction brake.

The triggering of the friction brake does not always have to happen, but for example depending on the moisture in combination with geodata and a priori information about parking the vehicle and / or other data, such as expected weather and moisture conditions, so that unnecessary friction brake activations
can be avoided.

In an electric or hybrid vehicle, the friction brake is to be controlled in a targeted manner so that any possible accumulation of moisture on the brake disc is removed.

In principle, the friction brake should be actuated as little as possible so that as much energy as possible can be recovered via regenerative braking. The corrosion (or rust) can affect a braking process with blinding as well as the performance of the friction brake and can also be objected to by technical testing organizations such as the TÜV if the contact pattern of the brake disc is less than 80% or the friction surface is more than 20% rusted . The friction brake should be controlled as situationally as possible; an a priori probability can be used for this, which takes environmental, usage and geo boundary conditions into account. The boundary conditions can be included in an a priori probability, which then determines whether rust or corrosion is to be reduced or avoided by braking with the friction brake before the vehicle is parked.

According to the invention, in the method for operating a brake control device for an electric or hybrid vehicle, a brake control device according to the invention is provided; detecting a need to activate the friction brake according to a predetermined operating scenario for the friction brake to reduce and/or prevent rust and/or corrosion on the friction brake; and actuating the friction brake according to a predefined operating scenario for the friction brake.

The brake control device can also be distinguished by the features mentioned in connection with the method and its advantages, and vice versa.

According to a preferred embodiment of the method, the route device and/or the control device determines a probability that a specific degree of rust and/or corrosion is present on the friction brake before the vehicle is parked, and the predefined operating scenario suggests a targeted activation of the friction brake after the vehicle is parked if the likelihood of a certain level of rust and/or corrosion being present is determined to be greater than a predetermined minimum.

According to a preferred embodiment of the method, the predefined operating scenario takes into account weather data and/or operating times and/or an operating location of the electric or hybrid vehicle and/or typical driving behavior of a driver of the electric or hybrid vehicle, and the friction brake is actuated before the vehicle is parked.

For the operating scenario, a start condition can be set for triggering the braking effect of the friction brake, for example by environmental boundary conditions based on the determined weather. One reason for triggering the brakes can be high humidity (determined by sensors such as temperature, pressure, weather server or others, or the track system), since this can promote moisture accumulation on the brake disc. A trigger value can be given when a predetermined humidity value prevails over a certain period of time. The presence of rainy weather can also be a reason for brake activation, which can promote moisture accumulation on the brake disc. The reason for the brake triggering can also be the presence of snowy weather, which can promote moisture accumulation on the brake disc. Another reason for brake activation can be the presence of damp or snow-covered roads, which can encourage moisture accumulation on the brake disc.

This information can be determined via weather and road information in networked vehicles or information via a smartphone vehicle or via vehicle sensor data (rain sensor, temperature sensor, ...). It the usage boundary condition can be met or achieved, such as frequent or exclusively regenerative braking, at least if this exceeds a predetermined limit value (frequency), which can promote moisture accumulation that can lead to surface corrosion when the vehicle is parked.

According to a preferred embodiment of the method, humidity at the location of the electric or hybrid vehicle is taken into account and the friction brake is activated when the humidity exceeds a predetermined value.

According to a preferred embodiment of the method, the friction brake is activated as a function of a local position of the electric vehicle or hybrid vehicle, with the friction brake being activated when the electric vehicle or hybrid vehicle is within a predetermined distance of a predetermined location.

The presence of other environmental or environmental factors can be decisive for triggering the braking process on the friction brake, for example if these exceed a predetermined value or duration. This can relate, for example, to geo-boundary conditions, so that the brake disks of an electric or hybrid vehicle do not begin to corrode when the vehicle is parked for a longer period (longer than a predetermined time value) or the probability of this is reduced. The Geo boundary conditions are used for this, such as a short-term stop (i.e. shorter than a predetermined time value), e.g. for shopping, which does not require friction brake actuation before parking, or parking the vehicle at a place other than where you work or not close to home, which does not trigger friction braking because of a short-term stop is to be expected, or parking the vehicle close to home and then actuating the friction brake, i.e. within a predetermined distance from the home; since it can then be assumed that the period of parking is greater than 12 hours.

Furthermore, parking the vehicle at the workplace or at a predetermined distance from it can mean that it can be assumed that the period of parking is greater than 8 hours. With the fulfilled environmental and usage boundary conditions, this can lead to the friction brake being triggered before it is switched off. Ideally, the Geo boundary conditions can be determined using GPS and can correspond to the predetermined operating scenario. Furthermore, data on parking and the duration of parking can be derived from habits, such as electronic calendar entries or storage of past geographic information.

If the ambient boundary conditions are met, the friction braking is ideally triggered depending on the local position of the electric or hybrid vehicle.

So that it can take place as close as possible to the parking location, i.e. when a predetermined distance from the parking location is reached. This can be stronger braking, which can occur repeatedly at the same point or during the parking process, i.e. in addition to the actual braking process to stop the vehicle, provided this is sufficient for the estimated degree of moisture (degree of rust or corrosion).

The operating scenario can correspond to a function in an electric or hybrid vehicle, characterized in that pure friction braking can be deliberately triggered by an ordinary basic brake (brake caliper, brake shoes, brake discs).

It can be taken into account, for example, whether the vehicle is in damp or dry places, in tunnels, houses, garages or outdoor parking lots and whether rust or corrosion can be promoted and to what extent.

In general, the braking performance (ratio of vehicle deceleration to the braking force applied) and the vehicle stability when braking after the motor vehicle has been parked for a long time can be improved and the friction brake function can thus be improved.

The route device, such as an ESP system, can use information about the idle time and the environmental conditions, such as a rain sensor, temperature, GPS coordinates, or other data about a motor vehicle, and determine the likelihood of rust forming on the brake discs or other components of the friction brake.

Further features and advantages of embodiments of the invention result from the following description with reference to the attached drawings.

character list

The present invention is explained in more detail below with reference to the exemplary embodiments given in the schematic figures of the drawing.

• 1 eine schematische Darstellung einer Bremsteuerungseinrichtung für ein Fahrzeug gemäß einem Ausführungsbeispiel der vorliegenden Erfindung;
• 2 eine schematische Darstellung einer Regellogik für einen Betrieb einer Bremsteuerungseinrichtung für ein Fahrzeug gemäß einem Ausführungsbeispiel der vorliegenden Erfindung;
• 3 eine Blockdarstellung von Verfahrensschritten des Verfahrens zum Betreiben einer Bremsteuerungseinrichtung für ein Fahrzeug gemäß einem Ausführungsbeispiel der vorliegenden Erfindung.

Show it:

• 1 a schematic representation of a brake control device for a vehicle according to an embodiment of the present invention;
• 2 a schematic representation of a control logic for an operation of a brake control device for a vehicle according to an embodiment of the present invention;
• 3 a block diagram of method steps of the method for operating a brake control device for a vehicle according to an embodiment of the present invention.

In the figures, the same reference symbols denote the same elements or elements with the same function.

1 FIG. 12 shows a schematic illustration of a brake control device for a vehicle according to an exemplary embodiment of the present invention.

The brake control device 10 for an electric or hybrid vehicle F comprises a control device SE, which can be connected to a friction brake RB in the electric or hybrid vehicle F and to a guideway device FE of the electric or hybrid vehicle F, the control device SE being set up to to operate the friction brake RB according to a specified operating scenario for the friction brake and the specified operating scenario relates to a reduction in rust or corrosion of the friction brake, the friction brake being operable for a specified period of time and with a specified braking power and thereby preventing corrosion and /or rust can be reduced or prevented, wherein the specified operating scenario can be determined or set up based on a signal or on data from the guideway device FE and can be carried out in addition to or instead of a recuperative braking process on the electric or hybrid vehicle F.

Furthermore, the route device FE can include a GPS position system and the control device SE can be set up to receive position data of the vehicle from the GPS position system and to apply the specified operating scenario taking the position data into account, with the position data determining a course of the roadway, a driving condition and/or humidity can be estimated at the friction brake. The formation of rust or corrosion on a respective friction brake can be determined by the guideway device FE or by its data and a braking pressure can be generated for a predetermined abrasion on the friction brake. The control device and/or route device can be connected to an external data server, for example to determine weather data and/or have stored preset values that determine when the vehicle is close to home or work. The usual travel and residence history can also be known or stored or can be called up, so that it can be estimated when the vehicle will be/has been at a specific location over a longer period of time.

2 shows a schematic representation of a control logic for operation of a brake control device for a vehicle according to an embodiment of the present invention.

The 2 shows that the control device SE can be connected to a sensor system S for receiving the relevant data for the operation of the friction brake, for example with a temperature sensor, a pressure sensor, a moisture sensor or another type of sensor to determine the presence of moisture on the friction brake and thus assessing the necessity of actuating the friction brake before or after the next shutdown. To determine the environmental data and to influence or select a specific operating scenario, the control device SE can also be connected to a GPS system and/or to the route device FE, for example to determine weather data. According to the specific operating scenario, for example generated by the control device, manually by the driver, specified by the manufacturer, obtained from a data server, and also in connection with known movement and parking patterns (duration), the friction brake RB can then be operated by the control device SE become. It is also possible for several operating scenarios to be created and stored, and then selected manually or depending on the prevailing conditions, by the driver or by the control device.

3 shows a block diagram of method steps of the method for operating a brake control device for a vehicle according to an embodiment of the present invention.

In the method for operating a brake control device for an electric or hybrid vehicle, a brake control device according to the invention is provided S1; a detection S2 of a need to activate the friction brake according to a predetermined operating scenario for the friction brake to reduce and/or prevent rust and/or corrosion on the friction brake; and an actuation S3 of the friction brake according to a predefined operating scenario for the friction brake.

Although the present invention has been fully described above with reference to the preferred exemplary embodiment, it is not restricted thereto but can be modified in a variety of ways.

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent Literature Cited

• DE 102012222349 A1 [0004]

Claims (10)

Brake control device (10) for an electric or hybrid vehicle (F), comprising: - A control device (SE) which can be connected to a friction brake (RB) in the electric or hybrid vehicle (F) and to a guideway device (FE) of the electric or hybrid vehicle (F), the control device (SE) being set up for this purpose to operate the friction brake (RB) according to a specified operating scenario for the friction brake and the specified operating scenario relates to a reduction in rust or corrosion or the avoidance of corrosion of the friction brake, the friction brake being operable for a specified period of time and with a specified braking power and thereby on at least one braking element of the friction brake, corrosion and/or rust can be reduced or prevented, in which case the specified operating scenario can be determined or set up based on a signal or on data from the guideway device (FE) and in addition to or instead of a recuperative braking process on the electric or hybrid vehicle (F ) is feasible. Brake control device (10) after claim 1 , in which the guideway device (FE) includes a brake pedal and the control device (SE) is set up to determine a driving and/or braking behavior of the driver and to take it into account in the specified operating scenario in order to guarantee a predetermined minimum degree of actuation of the friction brake. Brake control device (10) after claim 1 or 2 , In which the route device (FE) includes a position system (GPS) and the control device (SE) is set up to estimate an environmental condition or a past or impending downtime of the electric or hybrid vehicle (F) using data from the position system (GPS) and on to infer a developing and/or existing degree of rust and/or corrosion and to take it into account for the specified operating scenario. Brake control device (10) according to one of Claims 1 until 3 , in which the route device (FE) includes a weather data server or is connected to one and the control device (SE) is set up to estimate humidity conditions at the location of the electric or hybrid vehicle (F) using data from the weather data server and to an emerging and/or to conclude the existing level of rust and/or corrosion and to take this into account in the given operating scenario. Brake control device (10) according to one of Claims 1 until 4 , which can be connected to an electrical machine (EM) of the electric or hybrid vehicle (F), and is set up to combine regenerative braking with activating the friction brake in order to carry out the specified operating scenario and to effect a blend with the regenerative braking effect. Method for operating a brake control device (10) for an electric or hybrid vehicle (F), comprising the steps: - Providing (S1) a brake control device (10) according to one of Claims 1 until 5 ; - Recognizing (S2) a need to activate the friction brake (RB) after a predetermined operating scenario for the friction brake to reduce and / or prevent rust and / or corrosion on the friction brake; - Actuate (S3) the friction brake (RB) according to a predetermined operating scenario for the friction brake. procedure after claim 6 , in which the guideway device (FE) and/or the control device (SE) determines a probability that a specific degree of rust and/or corrosion is present on the friction brake and before the vehicle is parked, and the specified operating scenario activates it in a targeted manner of the friction brake prior to shutting down the vehicle when the likelihood of a certain level of rust and/or corrosion being present is determined to be greater than a predetermined minimum. procedure after claim 6 or 7 In which the predetermined operating scenario weather data and / or operating times and / or an operating location of the electric or hybrid vehicle (F) and / or a typical driving behavior of a driver of the electric or hybrid vehicle (F) and the friction brake actuates before parking the vehicle becomes. Procedure according to one of Claims 6 until 8th , in which humidity at the location of the electric or hybrid vehicle (F) is taken into account and the friction brake is activated when the humidity exceeds a predetermined value. Procedure according to one of Claims 6 until 9 , In which the activation of the friction brake is dependent on a local position of the electric or hybrid vehicle, the friction brake is activated when the electric or hybrid vehicle is within a predetermined distance of a predetermined location.

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