US-12617385-B2 - Prediction apparatus and prediction method for at least one brake system component of a brake system of a vehicle

US12617385B2US 12617385 B2US12617385 B2US 12617385B2US-12617385-B2

Abstract

A prediction device for at least one brake system component of a brake system of a vehicle. The prediction device is configured for provided value groups which each have values and/or information ascertained during a plurality of driving dynamics regulating processes executed during driver-induced and/or autonomous braking processes of the vehicle and each include an ascertained input variable, a simultaneously ascertained output variable, and an item of friction value or position indication information relating to a roadway simultaneously traveled on by the vehicle, to enter the value groups into a coordinate system having a plurality of target sectors which each correspond to a specified target relation between the input variable and the output variable at a specific friction value, and to estimate whether an occurrence of a functional impairment of a brake system component of the brake system is probable at least during a specified prediction time interval.

Inventors

Michael Zeutzius

Assignees

ROBERT BOSCH GMBH

Dates

Publication Date: 20260505
Application Date: 20220512
Priority Date: 20210519

Claims (10)

1 . A prediction device for at least one brake system component of a brake system of a vehicle, comprising: an electronic device configured to: for value groups provided to the electronic device, which each include values and/or information ascertained during a plurality of driving dynamics regulating processes actively executed during driver-induced and/or autonomous braking processes of the vehicle, and each include an ascertained input variable, a simultaneously ascertained output variable, and an item of friction value or location indication information relating to a roadway simultaneously traveled on by the vehicle, read or ascertain a respective friction value of the roadway simultaneously traveled on by the vehicle based on the respective friction value or location indication information, the input variable representing an actuation strength of an actuation of a brake pedal by a driver of the vehicle or an operating mode of a motorized brake pressure buildup device of the brake system, and the output variable representing a reaction of the brake system to the input variable; enter the value groups into a coordinate system having at least a first axis indicating the input variables and a second axis indicating the output variables, the friction values being indicated by a third axis of the coordinate system or sectors in a plane spanned by the first axis and the second axis, the plane of the coordinate system spanned by the first axis and the second axis being subdivided into a plurality of target sectors, each of which corresponds to a specified target relation between the input variable and the output variable at a particular friction value; and estimate, based on the friction values of the value groups distributed to the various target sectors, whether an occurrence of at least one functional impairment of at least one brake system component of the brake system is probable at least during a specified prediction time interval.
2 . The prediction device as recited in claim 1 , wherein the electronic device is configured to, for value groups provided to the electronic device, which each include, in addition to the ascertained input variable and the simultaneously ascertained output variable, a location indication of the roadway simultaneously traveled on by the vehicle as a friction value or location indication information, query the respective friction value from a specified friction value map based on the respective location indication and add the queried friction value to the value group.
3 . The prediction device as recited in claim 1 , wherein the electronic device is configured to filter out, from the value groups provided to the electronic device, which each include values and/or information ascertained during driver-induced and/or autonomous braking processes of the vehicle and which each include an item of controller state information in addition to the ascertained input variable, the simultaneously ascertained output variable, and the friction value or location indication information relating to the roadway simultaneously traveled by the vehicle, value groups having an item of controller state information that deviates from an actively executed vehicle dynamics regulating process.
4 . The prediction device as recited in claim 1 , wherein the electronic device is configured to assign brake operating points to each of the value groups entered into the coordinate system and to estimate, additionally taking into account a distribution of the brake operating points ascertained for the vehicle dynamics regulating processes, whether an occurrence of at least one functional impairment of at least the one brake system component of the brake system is probable at least during the specified prediction time interval.
5 . The prediction device as recited in claim 1 , wherein the prediction device is mountable on the vehicle.
6 . The prediction device as recited in claim 1 , wherein the prediction device has a communication device configured to receive the value groups transmitted by a data transmitting device of the vehicle.
7 . A prediction method for at least one brake system component of a brake system of a vehicle, comprising the following steps: ascertaining value groups during a plurality of driving dynamics regulating processes actively executed during driver-induced and/or autonomous braking processes of the vehicle, each of the ascertained value groups including an ascertained input variable, a simultaneously ascertained output variable, and an ascertained or queried friction value of a roadway simultaneously traveled on by the vehicle, the input variable representing an actuation strength of an actuation of a brake pedal by a driver of the vehicle or an operating mode of a motorized brake pressure buildup device of the brake system, and the output variable representing a reaction of the brake system to the input variable; entering the ascertained value groups into a coordinate system having at least a first axis indicating the input variables and a second axis indicating the output variables, the friction values being indicated by a third axis of the coordinate system or sectors in a plane spanned by the first axis and the second axis, an area of the coordinate system spanned by the first axis and the second axis being subdivided into a plurality of target sectors, each of which corresponds to a specified target relation between the input variable and the output variable at a particular friction value; and estimating, based on the friction values of the value groups distributed to the target sectors, whether an occurrence of at least one functional impairment of at least one brake system component of the brake system is probable at least during a specified prediction time interval.
8 . The prediction method as recited in claim 7 , where brake operating points are assigned to each of the value groups entered in the coordinate system and, additionally taking into account the distribution of the brake operating points ascertained for the vehicle dynamics regulating processes, it is estimated whether an occurrence of at least one functional impairment of at least the one brake system component of the brake system is probable at least during the specified prediction time interval.
9 . The prediction method as recited in claim 7 , wherein, before the ascertained value groups are entered into the coordinate system, the value groups are filtered out that are ascertained at a temperature outside a specified normal temperature range, and/or at an adjustment speed of the brake pedal adjusted by the driver outside a specified normal speed range, and/or at an on-board electrical system voltage outside a specified normal voltage range, and/or during a failure of a data provision device, and/or during a fading.
10 . The prediction method as recited in claim 7 , wherein: the input variable is: a rod travel of an input rod connected to the brake pedal, or a master cylinder pressure in a master cylinder of the brake system, or a motor current strength of a motor of the motorized brake pressure buildup device, or an operating voltage of the motor of the motorized brake pressure buildup device, or an adjusting travel of at least one adjustable piston of the motorized brake pressure buildup device, or a pumping rate of at least one pump used as the motorized brake pressure buildup device of the brake system, and/or the output quantity is: the master cylinder pressure in the master cylinder, or a motor torque of the motor of the motorized brake pressure buildup device, or a gear mechanism efficiency of a gear mechanism of the brake system connected to the motorized brake pressure buildup device, or at least one brake pressure in at least one wheel brake cylinder of the brake system, or a braking force applied to the vehicle by the brake system, or a braking torque applied to the vehicle by the brake system, or a vehicle deceleration applied to the vehicle by the brake system.

Description

FIELD The present invention relates to a prediction device for at least one brake system component of a brake system of a vehicle. Similarly, the present invention relates to a prediction method for at least one brake system component of a brake system of a vehicle. BACKGROUND INFORMATION Methods for monitoring a motor vehicle are described in the related art. For example, German Patent Application No. DE 10 2017 218 446 A1 describes a method for monitoring a motor vehicle with an automated driving function, in which in particular an energy storage device, which supplies at least one consumer designed to bring the motor vehicle to a standstill, is monitored. SUMMARY The present invention provides a prediction device for at least one brake system component of a brake system of a vehicle, and a prediction method for at least one brake system component of a brake system of a vehicle. The present invention provides advantageous means not only for monitoring, but also for early diagnosis of at least one brake system component of a brake system of a vehicle. Thus, the present invention not only enables a recognition of a failure that has already occurred of at least the one brake system component of the respective brake system, but also enables a prediction regarding future functional capacity and future operating behavior of at least the one brake system component of the brake system. As will be explained in more detail below, for a large number of different brake system components, such as for example for an electromechanical brake booster upstream of a master brake cylinder of the respective brake system and/or for a motorized plunger device integrated into the respective brake system (such as, specifically, an IPB, Integrated Power Brake), their future functional capacity can be reliably predicted using the present invention. Since by using the present invention a future functional impairment or a future failure of at least the one brake system component of the respective brake system can be predicted earlier, it is also advantageously suitable for safeguarding an autonomous driving operation of the vehicle equipped with the respective brake system. In an advantageous example embodiment of the prediction device of the present invention, for value groups provided to the electronic device which in each case include, in addition to the ascertained input variable and the simultaneously ascertained output variable, a location indication of the roadway simultaneously traveled on by the vehicle as friction value or location indication information, the electronic device is designed and/or programmed to query the respective friction value from a specified friction value map on the basis of the respective location indication and to add the queried friction value to the value group. Since the prediction device can also be understood as a prediction device that can be used separately from the vehicle, the prediction device can easily be equipped with an extensive friction value map from which the respective friction values can be queried. According to an example embodiment of the present invention, alternatively and additionally, the electronic device can be designed and/or programmed to filter out, from the value groups provided to the electronic device, which in each case have values and/or information ascertained during driver-induced and/or autonomous braking processes of the vehicle and in each case include an item of controller state information in addition to the ascertained input variable, the simultaneously ascertained output variable, and the friction value or location indication information relating to the roadway simultaneously traveled by the vehicle, the value groups having an item of controller state information that deviates from an actively executed vehicle dynamics regulating process. In this way, it can be reliably ensured that only value groups for actively executed vehicle dynamics regulating processes are entered into the coordinate system. Likewise, the technique described here can be used to ensure that value groups for actively executed vehicle dynamics regulating processes are matched with the brake characteristic map of the coordinate system as correct operating states of the brake system and are not interpreted as a malfunction. As an advantageous further development of the prediction device of the present invention, the electronic device can be designed and/or programmed to assign brake operating points to each of the value groups entered in the coordinate system and to estimate, additionally taking into account the distribution of the brake operating points ascertained for the vehicle dynamics regulating processes, whether an occurrence of at least one functional impairment of at least the one brake system component of the brake system is probable at least during the specified prediction time interval. This can improve the prediction carried out by the embodiment of the prediction device des