Sensor device for vehicle and multi-system brake system

Abstract

The present invention relates to a sensor device (1) for a vehicle, the sensor device (1) having at least two control units (ECU1, ECU2) each including at least one evaluation and control unit (10, 10A, 10B, 10C, 10D) and a plurality of sensor elements (DF1, DF2, DF3, DF4), each of which is associated with one brakeable wheel (R1, R2, R3, R4) and a control unit (ECU1, ECU2). Each wheel (R1, R2, R3, R4) is associated with one of the evaluation and control units (10A, 10B, 10C, 10D) of the control device (ECU1, ECU2), and is configured to detect at least one physical quantity of the corresponding wheel (R1, R2, R3, R4) and directly output it as an output signal (AS1, AS2, AS3, AS4) to the corresponding evaluation and control unit (10A, 10B, 10C, 10D). and a multi-system brake system having such a sensor device (1), the sensor device (1) being configured to perform at least one braking function of the vehicle (1) based on detected physical quantities of the sensor elements (DF1, DF2, DF3, DF4), and the individual evaluation and control units (10A, 10B, 10C, 10D) being configured to output received output signals (AS1, AS2, AS3, AS4) to at least one evaluation and control unit (10A, 10B, 10C, 10D) of the other control units (ECU1, ECU2), respectively, so that the individual evaluation and control units (10A, 10B, 10C, 10D) receive and process for evaluation output signals (AS1, AS2, AS3, AS4) of at least two sensor elements (DF1, DF2, DF3, DF4) associated with the evaluation and control units (10A, 10B, 10C, 10D) of the different control units (ECU1, ECU2).

Description

[Technical field]

[0001] The present invention relates to a sensor arrangement for a vehicle, the sensor arrangement comprising at least two control devices each including at least one evaluation and control unit and a number of sensor elements, each associated with one brakeable wheel, configured to detect at least one physical quantity of the corresponding wheel and to output it as an output signal. The control devices are each configured to perform at least one braking function of the vehicle based on the detected physical quantity of the wheel. A corresponding multi-path brake system comprising such a sensor arrangement is also the subject of the present invention. [Background technology]

[0002] For highly automated or autonomous driving, and for partially automated or autonomous driving functions, redundancy is typically required to ensure availability of sensors and functions even in many error cases. Thus, typically brake systems with primary and secondary stabilization of the vehicle are used. In particular, for braking, typically two independent brake devices or brake control systems are used. Both ideally require high availability of rotational speed information from a rotational speed sensor each associated with one wheel. In today's solutions, the rotational speed sensor is directly connected point-to-point to the primary control device. When using a two-box system approach, for example with an ESP system as the primary system and an electromechanical or other electric brake booster as the secondary system or with an integrated brake system (IPB) as the primary system and a redundant brake system (RBU) as the secondary system, additional effort and costs are required and do not cover all error cases, but the sensor signal of the speed sensor is looped through via the primary control device to the secondary control device or the speed sensor is switched between the primary and secondary control devices via a switching device in the event of a failure. Other known solutions provide for eight speed sensors, of which four speed sensors are connected directly to the primary control device and four speed sensors are connected directly to the secondary control device. With such a division, two speed sensors are installed on each wheel so that the system can redundantly stabilize the vehicle. This means that a total of eight speed sensors are used per vehicle, with the associated double costs for sensors and wiring.

[0003] From DE 10 2015209 565 A1, a method and a device for operating a motor vehicle are known. The device comprises an input for each external rotational speed sensor, a first control device, a second control device with a rotational speed detection device for the respective rotational speed sensor, and a calculation device with which the wheel rotational speed can be detected. In this case, the rotational speed signals of the rotational speed detection devices can be supplied to the first control device and to an output of the device, the respective rotational speed detection devices being functionally separated from one another and the second control device being functionally separated from the first control device and from the calculation device. In this way, each individual transmission path of the rotational speed detection system is configured to be redundant and activatable. In the event of a device defect, the wheel rotational speed can still be supplied to another control device which can be connected to the output of the device, for example to drive a secondary brake system. This is achieved in that the rotational speed detection device acts as a kind of splitter which distributes the rotational speed signal to several users.

[0004] From DE 10 2015 110 965 A1 an autonomous vehicle control subsystem is known, which comprises a first brake control module and a second brake control module communicatively and electrically connected to one another and a number of wheel rotation speed sensors, whereby a first subset of the wheel rotation speed sensors, which includes at least one first wheel rotation speed sensor of the number of wheel rotation speed sensors, is communicatively connected to the first brake control module but not to the second brake control module, and a second subset of the wheel rotation speed sensors, which includes at least one second wheel rotation speed sensor of the number of wheel rotation speed sensors, is communicatively connected to the second brake control module but not to the first brake control module. During typical operation of the vehicle and the autonomous vehicle control subsystem, the brake control modules communicate with each other to provide wheel rotation speed data of a number of different sensors, which enables each of the brake control modules to carry out operations for controlling braking of the vehicle. However, in case of an error in one of the brake control modules, e.g. an energy loss, the other brake control module uses at least some of the wheel speed data, i.e. the wheel speed data of at least one wheel speed sensor. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] DE 102015209565 A1 [Patent Document 2] DE 102015110965 A1 Summary of the Invention [Means for solving the problem]

[0006] Disclosure of the Invention The sensor arrangement for a vehicle and the corresponding multi-path brake system having the features of the independent claim 1 each have the advantage that a redundant sensor element concept can be realized using standard sensor elements, preferably configured as rotational speed detectors, and without switching devices, thereby saving costs for the duplicate rotational speed detectors and wiring. Furthermore, circuit components can be saved in the two control devices. In a preferred embodiment of the sensor arrangement with four rotational speed detectors and four evaluation and control units distributed to the two control devices, a handover or takeover of the sensor elements between the two control devices in the case of an error can advantageously be realized without additional switching devices and without delay times, since the two control devices can simultaneously receive and evaluate the output signals of the four rotational speed detectors.

[0007] According to an embodiment of the invention, a sensor device for a vehicle is provided, the sensor device having at least two control devices each including at least one evaluation and control unit, and a plurality of sensor elements, each associated with one brakeable wheel and with one of the evaluation and control units of the control devices, configured to detect at least one physical quantity of the corresponding wheel and output it directly as an output signal to the corresponding evaluation and control unit. The control devices are each configured to perform at least one braking function of the vehicle based on the detected physical quantity of the wheel. The individual evaluation and control units are configured to output the received output signal to at least one evaluation and control unit of the respective other control devices, whereby the individual evaluation and control units receive and process for evaluation the output signals of at least two sensor elements associated with the evaluation and control units of the different control devices, respectively.

[0008] Furthermore, a multi-system braking system, in particular for highly automated or autonomous vehicles, is proposed, which has a number of wheel brakes, each arranged on a wheel, such a sensor device detecting at least one physical quantity of the wheel, a primary control device performing at least one braking function of the vehicle based on the detected at least one physical quantity of the wheel, and a secondary control device performing at least one braking function of the vehicle based on the detected at least one physical quantity of the wheel.

[0009] A control device or primary or secondary control device in this context can be understood as an electrical device which processes or evaluates the detected sensor signals. For this purpose, the control device may have at least one evaluation and control unit for receiving and processing or processing the electrical output signals, at least one calculation unit for evaluating the processed output signals, at least one memory unit for storing signals or data, at least one interface with the sensor element for reading out the output signals or at least one interface with the actuator for outputting control signals to the actuator, and / or at least one communication interface for reading out or outputting data embedded in a communication protocol. An actuator in this context is configured, for example, as a solenoid valve or a pressure generator which can be driven accordingly by the control device. The at least one interface can be configured in the form of hardware and / or software. If configured in the form of hardware, the interface may for example be part of a so-called system circuit which includes several different functions of the control device. Such a system circuit can preferably be configured as an application specific integrated circuit (ASIC). Thus, for example, the at least one evaluation and control unit can be configured as an ASIC. However, the interface may also be an own integrated circuit or may at least partly consist of discrete components. If configured in the form of software, the interface may be a software module that is implemented, for example, on a microcontroller together with other software modules. The computing unit may be, for example, a signal processor, a microcontroller, etc., and the memory unit may be a flash memory, an EEPROM or a magnetic memory unit. Also advantageous is a computer program product with a program code that can be stored on a machine-readable carrier, such as a semiconductor memory, a hard disk or an optical memory, which is used to perform the evaluation, especially when implemented on a computing unit.The two control devices are connected to a primary or secondary actuator and can implement various braking functions, such as, for example, an ABS (Anti-lock Brake System) function, an ESP (Electronic Stability Program) function, an ASR (Anti-Slip Regulation) function and / or a hill start aid function. In this case, the two control devices can implement various braking functions during normal operation. In case of failure of one of the two control devices, the other control device can at least partially take over the braking function of the failed control device, thereby constituting a corresponding fallback level.

[0010] A primary or secondary actuator in this context can be understood as a hydraulic and / or electromechanical assembly capable of implementing corresponding control and / or regulating processes in a braking system for pressure build-up or pressure reduction in wheel brakes, for ABS (Anti-lock Brake System) or ASR (Anti-Slip Regulation) functions or Electronic Stability Program (ESP) or for an automatic parking function. To implement the control and / or regulating processes, the primary or secondary actuator comprises at least one braking pressure generator and a hydraulic valve unit with a solenoid valve, which can often be held in a unique position on the basis of the mutually opposing forces "magnetic force", "spring force" and "hydraulic force". Correspondingly, there are "normally open" and "normally closed" solenoid valve types. Furthermore, bistable solenoid valves are also used which can be switched between the "normally open" and "normally closed" states, such bistable solenoid valves remaining permanently in the respective operating state until the next switching signal. The braking pressure generator can in particular be operated by muscle force, assisting force and / or external force. "Assisted force" means muscle force actuation assisted by a brake booster. To implement the parking brake function, at least one wheel of the axle, preferably the rear axle, can be provided with an electromechanical actuator, which can be activated or deactivated via a corresponding drive signal.

[0011] A sensor element in this context can be understood as an electrical component which directly or indirectly detects a physical quantity or a change in a physical quantity in the region of the corresponding wheel and converts it into a preferably electrical output signal. Preferably, such a sensor element can be configured as a rotation speed detector, and the corresponding rotation speed information can be determined preferably by scanning a magnetic encoder or a ferromagnetic gear. The magnetic encoder is configured, for example, as a measurement value generator ring with a number of magnet elements, in particular permanent magnets, evenly distributed over the periphery, which magnets each have an alternating magnetic orientation and form a magnetic pole pair. The rotation speed sensor detects the magnetic field of these magnet elements during rotation of the measurement value generator ring, and as a function of the magnetic flux of the respective detected magnetic field in the evaluation and control unit, an output current is provided by a current interface for further use as rotation speed information. The rotation speed detectors can comprise, for example, Hall sensors, GMR (Giant Magnetoresistance) sensor elements, AMR (Anisotrope Magnetoresistance) sensor elements or TMR (Tunnel Magnetoresistance) sensor elements. In this case, the respective rotation speed detector can transmit its output signal as a data protocol, for example the AK protocol or the I protocol, via a current interface to a corresponding evaluation and control unit. To determine the rotation speed information, the rotation speed detectors detect, for example, zero crossings of a pole pair, and at the zero crossing of the respective pole pair, so-called "speed pulses" are formed which represent the actual rotation speed information, i.e. at the sign change of the detected magnetic field strength. The AK protocol comprises the "speed pulses" as rotation speed information and at least one additional rotation speed information as a data word with a number of protocol bits. The protocol bits define the data content of the at least one additional rotation speed information. The at least one additional rotation speed information relates, for example, to rotation direction information, air gap information, temperature information, pressure information, etc.

[0012] An evaluation and control unit in this context can be understood as an electrical circuit, preferably an application specific integrated circuit (ASIC), which receives and outputs or processes or processes the output signals of the sensor elements and outputs them as processed output signals. The sensor current flowing through the respective sensor element can thus be modulated by information about the detected measurand and transmitted to the corresponding evaluation and control unit, where it can be converted into a voltage signal representative of the corresponding measurement information. Furthermore, the individual evaluation and control units can supply, for example, "speed pulses" representative of the actual measurement information as voltage signals in real time to other control devices via point-to-point connections of at least one evaluation and control unit in each case. The evaluation and control unit can have several interfaces configured as part of the evaluation and control unit. The interfaces can, however, also be own integrated circuits or at least partly consist of discrete components.

[0013] The sensor arrangement for vehicles according to the independent claim 1 can be advantageously improved by the measures and developments specified in the dependent claims.

[0014] Particularly advantageously, the control devices may each comprise at least one calculation unit. In this case, the individual evaluation and control units can transmit processed output signals to at least one calculation unit of the corresponding control device. Furthermore, the processed output signals may contain additional measurement information, such as, for example, rotation direction information, air gap information, temperature information, pressure information, etc., and can be transmitted from the individual evaluation and control units to the corresponding calculation unit. The individual calculation units can evaluate the processed output signals in order to perform at least one corresponding braking function of the vehicle.

[0015] In an advantageous embodiment of the sensor device, the at least one physical quantity can represent a movement-dependent measured quantity and / or another measured quantity of the corresponding wheel. The movement-dependent measured quantity can represent the number of rotations and / or the rotation speed and / or the rotation direction. The at least one other measured quantity of the corresponding wheel can represent, for example, the temperature and / or the tire pressure.

[0016] In a further advantageous embodiment of the sensor arrangement, the computing unit can generate measurement data for each individual wheel on the basis of the processed output signals and supply them to a data bus for distribution in the vehicle. The data bus can be, for example, a CAN bus system or Ethernet or Flexray. Of course, other suitable networks or combinations of the above-mentioned in-vehicle networks can also be used to distribute the measurement data.

[0017] In a further advantageous embodiment of the sensor arrangement, the individual sensor elements can each be configured as a standard rotation speed detector, which allows a particularly cost-effective implementation of the sensor arrangement according to the invention.

[0018] In a further advantageous embodiment of the sensor device, a first controller of the at least two controllers and a second controller of the at least two controllers may each comprise two evaluation and control units. In this case, a first evaluation and control unit of each of the two controllers may be associated with a wheel of a first axle. Furthermore, a second evaluation and control unit of each of the two controllers may be associated with a wheel of a second axle. Furthermore, the first evaluation and control units of the two controllers associated with the wheels of the first axle and the second evaluation and control units of the two controllers associated with the wheels of the second axle may mutually exchange received output signals of the respective corresponding sensor elements.

[0019] In a further advantageous embodiment of the sensor arrangement, the evaluation and control units of the two control devices are able to transmit the received output signals of the corresponding sensor elements to at least one further control device respectively.

[0020] In a further advantageous embodiment of the sensor arrangement, the control device can each have a redundant energy supply, so that the evaluation and transmission of the output signals and the corresponding vehicle functions can still be carried out in the event of a failure of one of the energy supplies.

[0021] In a further preferred embodiment of the sensor device, the first control device can be configured as a primary control device and can drive an ESP system or an ESP system with a vacuum-independent electrohydraulic brake booster. The second control device can be configured as a secondary control device and can drive a vacuum-independent electrohydraulic brake booster or a redundant brake unit. The at least one further control device can be a drive control device configured to drive an inverter of an electric drive of the vehicle or can be a central control device configured to calculate a movement trajectory.

[0022] In an error case in which one of the evaluation and control units fails in an embodiment of the sensor arrangement and in an embodiment of a multi-path brake system having such a sensor arrangement, the output signals of the three sensor elements and the processed output signals are still available for evaluation in the two control devices. In the event of a failure of one of the calculation units in one of the control devices, the output signals of the four sensor elements and the processed output signals are still available for evaluation in the other of the two control devices. In the event of a failure of one of the four sensor elements, the output signals of the remaining three sensor elements and the processed output signals are still available for evaluation in the two control devices.

[0023] Exemplary embodiments of the invention are illustrated in the drawings and explained in more detail in the following description, in which identical reference signs refer to components or elements performing the same or similar functions. [Brief description of the drawings]

[0024] [Figure 1] 1 is a schematic block diagram of one embodiment of a sensor device for a vehicle according to the present invention; DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] EMBODIMENTS OF THE PRESENTINVENTION As can be seen from FIG. 1, the illustrated embodiment of a sensor arrangement 1 for a vehicle according to the present invention comprises at least two control units ECU1, ECU2 each comprising at least one evaluation and control unit 10, 10A, 10B, 10C, 10D, and a plurality of sensor elements DF1, DF2, DF3, DF4, each of which is associated with one brakeable wheel R1, R2, R3, R4 and with one of the evaluation and control units 10A, 10B, 10C, 10D of the control units ECU1, ECU2 and is configured to detect at least one physical quantity of the corresponding wheel R1, R2, R3, R4 and output it directly to the corresponding evaluation and control unit 10A, 10B, 10C, 10D as an output signal AS1, AS2, AS3, AS4. The control units ECU1, ECU2 implement at least one braking function of the vehicle 1 based on the detected motion-dependent physical quantities of the wheels R1, R2, R3, R4. The individual evaluation and control units 10A, 10B, 10C, 10D output the received output signals AS1, AS2, AS3, AS4 to at least one evaluation and control unit 10A, 10B, 10C, 10D of the respective other control units ECU1, ECU2, so that the individual evaluation and control units 10A, 10B, 10C, 10D receive and process for evaluation the output signals AS1, AS2, AS3, AS4 of the at least two sensor elements DF1, DF2, DF3, DF4 respectively associated with the evaluation and control units 10A, 10B, 10C, 10D of the different control units ECU1, ECU2.

[0026] As can further be seen from Fig. 1, the sensor arrangement 1 comprises, in the illustrated embodiment, two control units ECU1, ECU2 and four sensor elements DF1, DF2, DF3, DF4 configured as standard rotation speed detectors. In this case, the first sensor element DF1 is associated with a first wheel R1 of a first axle VA, which in this embodiment is the front axle, and with a first evaluation and control unit 10A of the first control unit ECU1. The second sensor element DF2 is associated with a first wheel R2 of a second axle HA, which in this embodiment is the rear axle, and with a second evaluation and control unit 10B of the first control unit ECU1. The third sensor element DF3 is associated with a second wheel R3 of the second axle HA, and with a second evaluation and control unit 10C of the second control unit ECU2. The fourth sensor element DF4 is associated with a second wheel R4 of the first axle VA, and with a first evaluation and control unit 10D of the second control unit ECU2. Thus, in the illustrated embodiment, the first evaluation and control units 10A, 10D of the two control devices ECU1, ECU2 are associated with the wheels R1, R4 of the first axle VA, and the second evaluation and control units 10B, 10C of the two control devices ECU1, ECU2 are associated with the wheels R2, R3 of the second axle HA.

[0027] As can further be seen from Fig. 1, the two control units ECU1, ECU2 in the illustrated embodiment each comprise one computing unit 3, 3A, 3B, with the first control unit ECU1 comprising a first computing unit 3A and the second control unit ECU2 comprising a second computing unit 3B. Furthermore, the two control units ECU1, ECU2 each have one redundant energy supply, not shown.

[0028] As can further be seen from Fig. 1, the first evaluation and control unit 10A of the first control unit ECU1 transmits the received output signal AS1 of the first sensor element DF1 to the first evaluation and control unit 10D of the second control unit ECU2, which in turn transmits the received output signal AS4 of the fourth sensor element DF4 to the first evaluation and control unit 10A of the first control unit ECU1. Thus, the first evaluation and control units 10A, 10D of the two control units ECU1, ECU2 receive the output signals AS1, AS4, respectively, of the first sensor element DF1 and of the fourth sensor element DF4, which are associated with the wheels R1, R4 of the first axle VA. Furthermore, two evaluation and control units 10A, 10D process the output signals AS1, AS4 of the first and fourth sensor elements DF1, DF4, and the first evaluation and control unit 10A of the first control unit ECU1 transmits the processed output signals AAS1, AAS4 to a first calculation unit 3A of the first control unit ECU1 for evaluation. The first evaluation and control unit 10D of the second control unit ECU2 transmits the processed output signals AAS1, AAS4 to a second calculation unit 3B of the second control unit ECU2 for evaluation.

[0029] As can further be seen from Fig. 1, the second evaluation and control unit 10B of the first control unit ECU1 transmits the received output signal AS2 of the second sensor element DF2 to the second evaluation and control unit 10C of the second control unit ECU2, which in turn transmits the received output signal AS3 of the third sensor element DF3 to the second evaluation and control unit 10B of the first control unit ECU1. Thus, the second evaluation and control units 10B, 10C of the two control units ECU1, ECU2 receive the output signals AS2, AS3, respectively, of the second sensor element DF2 and the third sensor element DF3 associated with the wheels R2, R3 of the second axle HA. Furthermore, two evaluation and control units 10B, 10C process the output signals AS2, AS3 of the second and third sensor elements DF2, DF3, and the second evaluation and control unit 10B of the first control unit ECU1 transmits the processed output signals AAS2, AAS3 to a first calculation unit 3A of the first control unit ECU1 for evaluation. The second evaluation and control unit 10C of the second control unit ECU2 transmits the processed output signals AAS2, AAS3 to a second calculation unit 3B of the second control unit ECU2 for evaluation. The two calculation units 3A, 3B evaluate the processed output signals AAS1, AAS2, AAS3, AAS4 in order to implement at least one corresponding braking function of the vehicle.

[0030] Of course, a different exchange of the received output signals AS1, AS3; AS2, AS4 of the corresponding sensor elements DF1, DF2, DF3, DF4 from the one shown is also possible. Furthermore, in a non-illustrated alternative embodiment of the sensor arrangement 1, the received output signals AS1, AS3; AS2, AS4 of the corresponding sensor elements DF1, DF2, DF3, DF4 can also be additionally transmitted to at least one further control device, not shown. The at least one further control device is, for example, a drive control device arranged to drive an inverter of an electric drive of the vehicle 1 or a central control device arranged to calculate the movement trajectory.

[0031] The sensor elements DF1, DF2, DF3, DF4 detect at least one physical quantity which represents a motion-dependent measured quantity and / or other measured quantities of the corresponding wheels R1, R2, R3, R4, respectively. In the illustrated embodiment, the at least one motion-dependent measured quantity represents the number of rotations and the direction of rotation. Of course, the detected physical quantity can also represent other motion-dependent measured quantities, such as, for example, the rotational speed. The at least one other measured quantity of the corresponding wheels R1, R2, R3, R4, in the illustrated embodiment, represents the temperature around the sensor elements DF1, DF2, DF3, DF4. Of course, the detected physical quantity can also represent other measured quantities, such as, for example, the tire pressure or the air gap information.

[0032] In the illustrated embodiment of the sensor arrangement 1, the calculation units 3A, 3B generate measurement data for the respective individual wheels R1, R2, R3, R4 based on the processed output signals AAS1, AAS2, AAS3, AAS4 and supply them to a data bus 5 for distribution within the vehicle.

[0033] The above-described embodiment of the sensor device 1 for a vehicle according to the invention, detecting at least one physical quantity of the wheels R1, R2, R3, R4, is preferably used in a multi-path brake system, in particular for highly automated or autonomous vehicles. Such a multi-path brake system comprises a number of wheel brakes (not shown), which are respectively arranged on the wheels R1, R2, R3, R4, a primary control device PSG, which performs at least one braking function of the vehicle on the basis of the detected at least one physical quantity of the wheels R1, R2, R3, R4, and a secondary control device SSG, which performs at least one braking function of the vehicle on the basis of the detected at least one physical quantity of the wheels R1, R2, R3, R4. In this case, the first control device ECU1 is configured as the primary control device PSG and the second control device ECU2 is configured as the secondary control device SSG.

[0034] In this case, the primary control device PSG can drive an ESP system or an ESP system with a vacuum-independent electrohydraulic brake booster or an integrated brake system (IPB), and the secondary control device SSG can drive a vacuum-independent electrohydraulic brake booster or a redundant brake unit.

[0035] The primary control device PSG and the secondary control device SSG receive the output signals AS1, AS3; AS2, AS4 of the corresponding sensor elements DF1, DF2, DF3, DF4 in real time for further evaluation and for carrying out the corresponding braking functions or for carrying out the primary stabilization of the vehicle or, in an emergency in case of failure of the primary stabilization, the secondary stabilization of the vehicle. To carry out the corresponding braking functions and the primary stabilization of the vehicle, the primary control device PSG can drive corresponding known primary actuators, not shown in detail, via which the brake system can carry out pressure build-up or pressure reduction at the wheel brakes and carry out corresponding control and / or regulation processes. To carry out the corresponding braking functions and the secondary stabilization of the vehicle, the secondary control device SSG can drive corresponding known secondary actuators, not shown in detail, via which the brake system can carry out pressure build-up or pressure reduction at the wheel brakes and carry out corresponding control and / or regulation processes. To implement the parking brake function, at least one of the two control units ECU1, ECU2 is electrically connected via an electrical connection to a corresponding actuator of an electric parking brake, not shown in detail. Preferably, the actuator of the parking brake function is arranged on the second axle HA or on the wheels R2, R3 of the rear axle. In an alternative embodiment of the sensor device 1, not shown, the actuator of the electric parking brake is additionally or alternatively arranged on the first axle VA or on the wheels R1, R4 of the front axle.

Claims

1. A sensor device (1) for a vehicle, comprising: The sensor device (1) comprises: at least two control devices (ECU1, ECU2) each including at least one evaluation and control unit (10, 10A, 10B, 10C, 10D); A plurality of sensor elements (DF1, DF2, DF3, DF4); having The plurality of sensor elements (DF1, DF2, DF3, DF4) each associated with one brakeable wheel (R1, R2, R3, R4) and with one of the evaluation and control units (10A, 10B, 10C, 10D) of the control device (ECU1, ECU2), is configured to detect at least one physical quantity of the corresponding wheel (R1, R2, R3, R4) and output the detected physical quantity directly to the corresponding evaluation and control unit (10A, 10B, 10C, 10D) as an output signal (AS1, AS2, AS3, AS4), the control devices (ECU1, ECU2) are each configured to perform at least one braking function of the vehicle (1) based on the detected physical quantities of the wheels (R1, R2, R3, R4); Each of the evaluation and control units (10A, 10B, 10C, 10D) is configured to output the received output signal (AS1, AS2, AS3, AS4) to at least one evaluation and control unit (10A, 10B, 10C, 10D) of each of the other control devices (ECU1, ECU2); Thus, each of the evaluation and control units (10A, 10B, 10C, 10D) receives the output signals (AS1, AS2, AS3, AS4) of at least two sensor elements (DF1, DF2, DF3, DF4) associated with the evaluation and control units (10A, 10B, 10C, 10D) of a number of different control devices (ECU1, ECU2), processes them for evaluation, A first control device (ECU1) of the at least two control devices (ECU1, ECU2) and a second control device (ECU2) of the at least two control devices (ECU1, ECU2) each include two evaluation and control units (10A, 10B, 10C, 10D); a first evaluation and control unit (10A, 10D) of each of the two control devices (ECU1, ECU2) is associated with one of the wheels (R1, R4) of a first axle (VA), a second evaluation and control unit (10B, 10C) of each of the two control devices (ECU1, ECU2) is associated with the wheels (R2, R3) of a second axle (HA), the first evaluation and control units (10A, 10D) of the two control devices (ECU1, ECU2) associated with the wheels (R1, R4) of the first axle (VA) and the second evaluation and control units (10B, 10C) of the two control devices (ECU1, ECU2) associated with the wheels (R2, R4) of the second axle (HA) mutually exchange the output signals (AS1, AS3; AS2, AS4) received by the corresponding sensor elements (DF1, DF2, DF3, DF4); Sensor device (1).

2. The control devices (ECU1, ECU2) each include at least one calculation unit (3, 3A, 3B), Each of the evaluation and control units (10A, 10B, 10C, 10D) is further configured to transmit a processed output signal (AAS1, AAS2, AAS3, AAS4) to the at least one calculation unit (3, 3A, 3B) of the corresponding control device (ECU1, ECU2), Each of the calculation units (3A, 3B) is configured to evaluate the processed output signals (AAS1, AAS2, AAS3, AAS4) in order to perform at least one corresponding braking function of the vehicle. A sensor device (1) according to claim 1.

3. the at least one physical quantity represents a movement-dependent measurement quantity and / or another measurement quantity of the corresponding wheel (R1, R2, R3, R4); A sensor device (1) according to claim 1 or 2.

4. The at least one motion-dependent measurand represents the number of rotations and / or the rotation speed and / or the direction of rotation. Sensor device (1) according to claim 3.

5. said calculation units (3, 3A, 3B) generate measurement data for each individual wheel (R1, R2, R3, R4) based on said processed output signals (AAS1, AAS2, AAS3, AAS4) and supply them to a data bus (5) for distribution within the vehicle; The sensor device (1) according to claim 2.

6. The individual sensor elements (DF1, DF2, DF3, DF4) are each designed as a standard rotation speed detector. A sensor device (1) according to any one of the preceding claims.

7. the evaluation and control units (10A, 10B, 10C, 10D) of the two control units (ECU1, ECU2) transmit the received output signals (AS1, AS3; AS2, AS4) of the corresponding sensor elements (DF1, DF2, DF3, DF4) to at least one further control unit, A sensor device (1) according to any one of the preceding claims.

8. The control devices (ECU1, ECU2) each have one redundant energy supply unit. A sensor device (1) according to any one of the preceding claims.

9. The first control unit (ECU1) is configured as a primary control unit (PSG) and drives an ESP system or an ESP system with a vacuum-independent electrohydraulic brake booster. A sensor device (1) according to any one of the preceding claims.

10. The second control unit (ECU2) is configured as a secondary control unit (SSG) and drives a vacuum-independent electrohydraulic brake booster or a redundant brake unit. Sensor device (1) according to any one of the preceding claims.

11. the at least one further control device being a drive control device configured to drive an inverter of an electric drive of the vehicle (1) or a central control device configured to calculate a movement trajectory, Sensor device (1) according to claim 7.

12. A multi-path braking system, in particular for a highly automated or autonomous vehicle, comprising: A plurality of wheel brakes arranged on the wheels (R1, R2, R3, R4); A sensor device (1) for detecting at least one physical quantity of the wheels (R1, R2, R3, R4); a primary control unit (PSG) for implementing at least one braking function of the vehicle based on the detected at least one physical quantity of the wheels (R1, R2, R3, R4); a secondary control device (SSG) for implementing at least one braking function of the vehicle based on the detected at least one physical quantity of the wheels (R1, R2, R3, R4); In a multi-system brake system having The sensor device (1) is configured as a sensor device (1) according to any one of claims 1 to 11. A multi-system brake system.

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