Sensor arrangement for a vehicle

Abstract

The invention relates to a sensor arrangement (10) for a vehicle, comprising a sensor element (14), an ohmic shunt resistor (RS) which is arranged electrically in series with the sensor element (14), and a current mirror circuit (12) which is designed to generate at least two measuring currents (I1, I2) from a sensor current (IS) flowing through the sensor element (14) and the shunt resistor (RS), which is modulated with information about a detected measured variable, which currents represent the detected measured variable and can each be output to a control unit.

Description

The invention relates to a sensor arrangement for a vehicle. The present invention also relates to a vehicle having at least one such sensor arrangement.Sensor arrangements for vehicles are known from the prior art, each of which has a wheel sensor with at least one sensor element per vehicle wheel. The individual wheel sensors are generally connected via a two-wire twisted cable to a control device for a vehicle brake system, which carries out functions for example for an anti-lock brake system (ABS), an electronic stability program (ESP), a traction control system (ASR) and / or a hillhold function. In this case, a sensor current flowing through the at least one sensor element is modulated with information about the rotational speed and / or rotational speed of the corresponding vehicle wheel and is evaluated by the control unit.DE 10 2018 204 599 A1 discloses a sensor arrangement for a vehicle, having a sensor element and at least two control units, each of which has an evaluation and control unit and an energy source. In a first control unit, a first evaluation and control unit is connected to a first energy source, and in a second control unit, a second evaluation and control unit is connected to a second energy source. In this case, the first control unit comprises a changeover device which connects a first terminal of the sensor element to the first energy source and / or to the second energy source. A second terminal of the sensor element is connected to the second control device. A sensor current flowing through the sensor element is modulated with information about a detected measured variable.The first evaluation and control unit evaluates the sensor current detected between the connected energy source and the sensor element, and the second evaluation and control unit evaluates the sensor current detected between the sensor element and ground, wherein the changeover device connects the first connection of the sensor element to the other energy source in the event of failure of the connected energy source.Disclosure of the InventionThe sensor arrangement for a vehicle having the features of independent claim 1 and a vehicle having at least one such sensor arrangement each have the advantage that multiplication of a sensor current flowing through a sensor element, which is modulated with information about a detected measured variable, is possible in a simple and cost-effective manner. As a result, a plurality of control units can demodulate the sensor current almost simultaneously and evaluate the information about the detected measured variable redundantly.Embodiments of the present invention provide a sensor arrangement for a vehicle, having a sensor element, an ohmic shunt resistor which is arranged electrically in series with the sensor element, and a current mirror circuit which is designed to generate at least two measurement currents from a sensor current which flows through the sensor element and the shunt resistor and is modulated with information about a detected measurement variable, said measurement currents representing the detected measurement variable and each being able to be output to a control unit.In addition, a vehicle having four wheel sensors, which are each assigned to a vehicle wheel and designed to detect a rotational speed and / or rotational speed of the assigned vehicle wheel, and at least two control units, which are each coupled to the four wheel sensors, is proposed. In this case, the four wheel sensors each have such a sensor arrangement.In the present case, a control unit can be understood to mean an electrical device, such as a brake control unit, which, in conjunction with a hydraulic brake system, can carry out various brake functions, for example for an antilock brake system (ABS), an electronic stability program (ESP), a traction slip control (ASR) and / or a hillhold function. For this purpose, the corresponding control device can process or evaluate detected sensor signals. When two control units are used, they can perform different braking functions during normal operation. In the event of a failure of one of the control units, it can be provided that the other control unit takes over the braking functions of the failed control unit. The control device can have at least one interface, which can be designed as hardware and / or software. In a hardware configuration, the interfaces can be part of a so-called system ASIC, for example, which contains a wide variety of functions of the control unit. However, it is also possible for the interfaces to be dedicated, integrated circuits or to consist at least partially of discrete components. In the case of a software configuration, the interfaces can be software modules which are present, for example, on a microcontroller in addition to other software modules. A computer program product having program code which is stored on a machine-readable carrier such as a semiconductor memory, a hard disk memory or an optical memory and is used for carrying out the evaluation when the program is executed by the control device is also advantageous.In the present case, a sensor element can be understood to mean an electrical component which directly or indirectly detects a physical variable or a change in a physical variable and preferably converts it into an electrical sensor signal. This can be effected, for example, by emitting and / or receiving sound and / or electromagnetic waves and / or by a magnetic field or changing a magnetic field. Optical sensor elements are possible which have, for example, a photo plate and / or a fluorescent surface and / or a semiconductor which detect the incidence or the intensity, the wavelength, the frequency, the angle etc. of the received wave, such as, for example, infrared sensor elements. Likewise, an acoustic sensor element is conceivable, such as an ultrasonic sensor element and / or a high-frequency sensor element and / or a radar sensor element and / or a sensor element which reacts to a magnetic field, such as a Hall sensor element and / or a magnetoresistive sensor element and / or an inductive sensor element, which registers the change of a magnetic field, for example, via the voltage arising by magnetic induction. The sensor element can preferably be designed to detect at least one rotational speed and / or rotational speed of a moving body.The measures and developments specified in the dependent claims make advantageous improvements of the sensor arrangement for a vehicle specified in independent patent claim 1 possible.It is particularly advantageous that the at least two measurement currents can each flow through an ohmic measurement resistor. A ratio of the shunt resistor to the respective measuring resistor can be used to preset a corresponding ratio of the respective measuring current to the sensor current. Thus, protocols having different defined current levels can be easily implemented. Thus, additional current levels can also encode functional and fault states of the sensor element and meet control unit-side requirements for fault state detection. Furthermore, the more modern "AK / v" protocol can also be implemented with the typical levels 7 mA / 14 mA / 28 mA, without additional current sources being driven. In this case, the shunt resistor can have a resistance value in the range from 10 to 20 Ohm or in the range from 50 to 100 Ohm. The at least two measuring resistors can each have an identical resistance value in the range from 50 to 100 Ohm or in the range from 5 to 10 Kilo Ohm. If the resistance value of the at least two measuring resistors is in each case in the range from 5 to 10 kiloohms, then a current reduction and a reduction in the power loss can be implemented. In this case, the corresponding measured variables are adapted in the associated control unit in accordance with the ratio of the shunt resistance to the respective measured resistance.In an advantageous embodiment of the sensor arrangement, the current mirror circuit can comprise at least two differential amplifiers and at least two control elements, which are each arranged electrically in series with one of the measuring resistors and are each assigned to one of the differential amplifiers. In this case, a voltage representing the sensor current can be applied in each case to a reference input of the at least two differential amplifiers. In addition, a measurement input of the at least two differential amplifiers can be connected to a connection point between the corresponding measuring resistor and the associated actuator, respectively. The at least two differential amplifiers can be designed to set a corresponding one of the at least two measurement currents via the associated actuator on the basis of the sensor current. When using two differential amplifiers, the measurement input of a first differential amplifier can be connected to the connection point between a first measuring resistor and a first actuator assigned to the first differential amplifier. The measurement input of a second differential amplifier can be connected to the connection point between a second measuring resistor and a second actuator assigned to the second differential amplifier. The current mirror circuit can be easily extended with additional sense resistors, differential amplifiers and actuators for the output of more than two sense currents. This means that the current mirror circuit can be extended to the output of three measurement currents by a third measuring resistor, a third differential amplifier and a third actuator, or to the output of four measurement currents by a third and fourth measuring resistor, a third and fourth differential amplifier and a third and fourth actuator. The two differential amplifiers can preferably be designed as operational amplifiers and the at least two control elements can each be designed as transistors. By means of the ratio of the shunt resistance to the corresponding measuring resistance, any desired measuring current can be set in this case. Thus, in the case of using a sensor element with the "AK / v" protocol, the shunt resistor could be selected such that a reduced hysteresis voltage of 0.8 volts is parameterized (type. 1.8 volts) and thus also a minimum supply voltage reduced by 1 volt could be used.In an alternative embodiment of the sensor arrangement, the current mirror circuit can comprise a differential amplifier and at least two actuating elements, which are each arranged electrically in series with one of the measuring resistors and are each connected to an output of the differential amplifier. In this case, a voltage representing the sensor current can be applied to a reference input of the differential amplifier. In addition, a measurement input of the differential amplifier can be connected to one of the connection points between the corresponding measuring resistor and the associated actuator. The differential amplifier is designed to set the at least two measurement currents via the at least two actuators on the basis of the sensor current. This means that the measurement input of the differential amplifier can be connected either to the connection point between a first measuring resistor and a first actuator or to the connection point between a second measuring resistor and a second actuator. The differential amplifier can preferably be designed as an operational amplifier and the at least two control elements can each be designed as transistors. Here, the same transistors can preferably be used. By saving a differential amplifier, a cost reduction is possible in comparison with the circuit variant described above. This circuit is also arbitrarily scalable on the output side. Usually, a so-called base resistor can be introduced between the output of the differential amplifier and a base of the at least two driven transistors.In a further alternative configuration of the sensor arrangement, the current mirror circuit can comprise a reference element which is arranged electrically in series with the shunt resistor, and at least two actuating elements which are each arranged electrically in series with one of the measuring resistors and are each connected to an output of the reference element. In this case, the reference element can be designed to set the at least two measurement currents via the at least two actuating elements on the basis of the sensor current. The reference element and the at least two control elements can each be embodied as transistors with a high current amplification of more than 500. This configuration can preferably be used for the case where a regulated and stabilized supply voltage with sufficient minimum voltage is provided to the sensor element instead of an uncontrolled supply voltage. Due to the high current amplification of the transistors, the ratio of the respective base current to the sensor current can be kept negligibly small, since this can enter into the transmission directly as mirror errors. Alternatively, by an improved current mirror using a three-transistor current mirror for the individual at least two sense currents, the effect of the base currents of the transistors on the sense currents can be compensated for, but at the expense of a minimum supply voltage higher by one flow voltage (~0.7V). In these embodiments, too, the respective mirrored measurement current can be varied within a certain range via the resistance ratios of the shunt resistor to the at least two measurement resistors.Exemplary embodiments of the invention are illustrated in the drawings and are explained in more detail in the following description. In the drawings, like reference numerals designate components or elements that perform like or analogous functions.Brief Description of the DrawingsFIG. 1 shows a schematic block diagram of an exemplary embodiment of a sensor arrangement according to the invention for a vehicle, having a current mirror. FIG. 2 shows a schematic block diagram of the sensor arrangement according to the invention for a vehicle from FIG. 1, with a first exemplary embodiment of the current mirror. FIG. 3 shows a schematic block diagram of the sensor arrangement according to the invention for a vehicle from FIG. 1, with a second exemplary embodiment of the current mirror. FIG. 4 shows a schematic block diagram of the sensor arrangement according to the invention for a vehicle from FIG. 1, having a third exemplary embodiment of the current mirror. FIG. 5 shows a schematic illustration of an exemplary embodiment of a vehicle according to the invention having four sensor arrangements according to the invention for a vehicle from FIGS. 1 to 4.Embodiments of the InventionAs can be seen from FIGS. 1 to 4, the illustrated exemplary embodiments of a sensor arrangement 10 according to the invention for a vehicle 1 illustrated in FIG. 5 each comprise a sensor element 14, an ohmic shunt resistor RS, which is arranged electrically in series with the sensor element 14, and a current mirror circuit 12, which is designed to generate at least two measurement currents I 1, I 2, which represent the detected measurement variable and can each be output to a control unit ECU 1, ECU 2 illustrated in FIG. 5, from a sensor current IS, which flows through the sensor element 14 and the shunt resistor RS and is modulated with information about a detected measurement variable.In the exemplary embodiments of the sensor arrangement 10 shown, the current mirror circuit 12 generates two measurement currents I 1, I 2 each from the sensor current IS fließenden through the sensor element 14 and the shunt resistor RS, which measurement currents represent the detected measurement variable. Here, a first measurement current I 1 generated from the sensor current IS is output to a first control unit ECU 1. A second measurement current I 2 generated from the sensor current IS is output to a second control unit ECU 2.As can be further seen from FIGS. 1 to 4, the sensor arrangement 10 is in each case supplied by a supply voltage VPP and the two measurement currents I 1, I 2 flow in each case through an ohmic measurement resistor R 1, R 2. This means that the first measurement current I 1 flows through a first ohmic measurement resistor R 1. The second measurement current I 2 flows through a second ohmic measurement resistor R 2. A corresponding first ratio I 1 / ISof the first measurement current I 1 to the sensor current ISis predefined via a first ratio RS / R 1 of the shunt resistor RSto the first measurement resistor R 1. A corresponding second ratio I 2 / ISof the second measurement current I 2 to the sensor current ISis predefined via a second ratio RS / R 2 of the shunt resistor RSto the second measurement resistor R 2. In the exemplary embodiments of the sensor arrangement 10 shown, the shunt resistor RShas a resistance value in the range from 50 to 100 Ohm. The two measuring resistors R 1, R 2 each have a resistance value in the range from 5 to 10 kiloohms.As can be further seen from FIG. 2, the current mirror circuit 12A of the sensor arrangement 10A in the first exemplary embodiment shown comprises two differential amplifiers 16, 16A, 16B and two control elements 18, 18A, 18B, which are each arranged electrically in series with one of the measuring resistors R 1, R 2 and are each assigned to one of the differential amplifiers 16, 16A, 16B. Here, a first actuator 18A is associated with a first differential amplifier 16A, and a second actuator 18B is associated with a second differential amplifier 16B. As can be further seen from FIG. 2, a voltage representing the sensor current ISis in each case applied to a reference input of the two differential amplifiers 16, 16A, 16B. A measurement input of the two differential amplifiers 16, 16A, 16B is connected in each case to a connection point between the corresponding measuring resistor R 1, R 2 and the associated actuator 18, 18A, 18B. In the illustrated first embodiment of the current mirror circuit 12A, the measurement input of the first differential amplifier 16A is connected to the junction point between a first measurement resistor R 1 and the first actuator 18A. The measurement input of the second differential amplifier 16B is connected to the connection point between a second measuring resistor R 2 and the second actuator 18B. The two differential amplifiers 16, 16A, 16B are each designed to set a corresponding one of the two measurement currents I 1, I 2 via the associated actuator 18 based on the sensor current IS. In the illustrated first exemplary embodiment of the current mirror circuit 12A, the two differential amplifiers 16, 16A, 16B are each designed as operational amplifiers. The two control elements 18, 18A, 18B are each designed as transistors T 1, T 2.As can be further seen from FIG. 2, the sensor current ISis converted into a voltage by means of the shunt resistor RSand is fed as a setpoint specification in each case to a reference input of the first differential amplifier 16A and to a reference input of the second differential amplifier 16B. A voltage drop across the first measuring resistor R 1 is fed to a second input or the measuring input of the first differential amplifier 16A, the output of which controls a base of the corresponding first actuator 18A embodied as a transistor T 1 such that a voltage difference at the input of the corresponding first differential amplifier 16A approaches zero. As a result, the corresponding first measurement current I 1 corresponds to the sensor current ISwhen the shunt resistor RSand the corresponding first measurement resistor R 1 are of equal size. A voltage drop across the second measuring resistor R 2 is supplied to a second input or the measuring input of the second differential amplifier 16B, the output of which drives a base of the corresponding second actuator 18B embodied as a transistor T 2 such that a voltage difference at the input of the corresponding second differential amplifier 16B approaches zero. As a result, the corresponding second measuring current I 2 corresponds to the sensor current ISwhen the shunt resistor RSand the corresponding second measuring resistor R 2 are of equal size. The sensor arrangement 10A can be expanded by any other measurement currents I 3, I 4 etc.As can be further seen from FIG. 3, the current mirror circuit 12B of the sensor arrangement 10B in the second exemplary embodiment shown comprises a differential amplifier 16 and two actuating elements 18, 18A, 18B, which are each arranged electrically in series with one of the measuring resistors R 1, R 2 and are each connected to an output of the differential amplifier 16. In this case, a voltage representing the sensor current ISis applied to a reference input of the differential amplifier 16. In addition, a measurement input of the differential amplifier 16 is connected to one of the connection points between the corresponding measuring resistor R 1, R 2 and the associated actuator 18, 18A, 18B. In the illustrated second exemplary embodiment of the current mirror circuit 12B, the measurement input of the differential amplifier 16 is connected to the connection point between the second measurement resistor R 2 and the second actuator 18B. The differential amplifier 16 is designed to set the at least two measurement currents I 1, I 2 via the at least two actuators 18 on the basis of the sensor current IS. In the second exemplary embodiment of the current mirror circuit 12B shown, the differential amplifier 16 is designed as an operational amplifier. The two actuators 18, 18A, 18B are designed as identical transistors T 1, T 2.As can be further seen from FIG. 3, the sensor current ISis converted into a voltage by means of the shunt resistor RSand is fed as a setpoint input to a reference input of the differential amplifier 16. A voltage drop across the second measuring resistor R 2 is supplied to a second input or the measuring input of the differential amplifier 16, the output of which controls a base of the second actuator 18B embodied as a transistor T 2 such that a voltage difference at the input of the differential amplifier 16 approaches zero. As a result, the corresponding second measuring current I 2 corresponds to the sensor current ISwhen the shunt resistor RSand the corresponding second measuring resistor R 2 are of equal size. As can be further seen from FIG. 3, the output of the differential amplifier 16 also controls a base of the first actuator 18A, which is embodied as a transistor T 1 and which correspondingly sets the first measurement current I 1. Due to product variances of the two transistors T 1, T 2 and of the shunt resistor RS and of the two measuring resistors R 1, R 2, only the measuring current I 1, I 2 of one of the two actuating elements 18A, 18B can correspond here to the sensor current IS, the voltage drop generated across the corresponding measuring resistor R 1, R 2 of which is supplied to the second input of the differential amplifier 16. Thus, only the second measurement current I 2 of the second actuator 18B or of the second transistor T 2 corresponds here to the sensor current IS. The measurement current I 1 of the other, here of the first actuator 18A, can therefore deviate from the sensor current IS. A reduction in this effect can be achieved by increasing the resistance values of the shunt resistor RS and the measuring resistors R 1, R 2. This exemplary embodiment of the sensor arrangement 10B is also arbitrarily scalable on the output side.As can be further seen from FIG. 3, in order to protect the transistors T 1, T 2, a first so-called ohmic base resistor RB 1 is arranged between the output of the differential amplifier 16 and the base of the driven first transistor T 1, and a second ohmic base resistor RB 2 is arranged between the output of the differential amplifier 16 and the base of the driven second transistor T 2. In the feedback branch between the second transistor T2 and the second input of the differential amplifier 16, an ohmic feedback resistor RK is introduced.As can be further seen from FIG. 4, the current mirror circuit 12C of the sensor arrangement 10C in the third exemplary embodiment illustrated comprises a reference element 19 which is arranged electrically in series with the shunt resistor RS, and two actuating elements 18, 18A, 18B which are each arranged electrically in series with one of the measuring resistors R 1, R 2 and are each connected to an output of the reference element 19. The reference element 19 is designed to set the two measurement currents I 1, I 2 via the two actuators 18, 18A, 18B on the basis of the sensor current IS. In the third exemplary embodiment of the current mirror circuit 12C shown, the reference element 19 and the two actuating elements 18, 18A, 18B are each embodied as transistors T 1, T 2, T 3 having a high current gain of more than 500. In this case, the sensor current IS fließende through the reference element 19 embodied as transistor T 3 generates a voltage drop between its emitter and its base and its collector connected to the base, which is substantially passed on to the respective base of the two actuating elements 18, 18A, 18B embodied as transistors T 1, T 2. The result is the two measurement currents I 1, I 2 through the control elements 18, 18A, 18B embodied as transistors T 1, T 2, which correspond to the sensor current IS through the reference element 19 embodied as transistor T 3. The ohmic shunt resistor RS introduced and the ohmic measuring resistors R 1, R 2 partially compensate for the product spreads of the transistors T 1, T 2, T 2, which should be as identical as possible and should be selected from a production batch. Due to the high current amplification of the transistors T 1, T 2, T 3, the ratio of the respective base current of the two control elements 18, 18A, 18B embodied as transistors T 1, T 2 to the sensor current IS is kept negligibly small, since this can enter into the transmission directly as mirror errors. In this exemplary embodiment, too, the respective mirrored measurement current I 1, I 2 can be varied within a certain range via the resistance ratios of the shunt resistor RS to the two measurement resistors R 1, R 2. In addition, the third exemplary embodiment of the sensor arrangement 10C is also arbitrarily scalable on the output side.As can be further seen from FIG. 5, the illustrated exemplary embodiment of the vehicle 1 according to the invention comprises four wheel sensors WSS_VL, WSS_VR, WSS_HL, WSS_HR, which are each assigned to a vehicle wheel, which is not illustrated in more detail, and at least two control units ECU 1, ECU 2, which are each coupled to the four wheel sensors WSS_VL, WSS_VR, WSS_HL, WSS_HR. Here, a first wheel sensor WSS_VL is assigned to a left front wheel of the vehicle 1. A second wheel sensor WSS_VR is associated with a right front wheel of the vehicle 1. A third wheel sensor WSS_HL is associated with a left rear wheel of the vehicle 1, and a fourth wheel sensor WSS_HR is associated with a right rear wheel of the vehicle 1. The individual wheel sensors WSS_VL, WSS_VR, WSS_HL, WSS_HR are designed to detect a rotational speed and / or rotational speed of the associated vehicle wheel. For this purpose, the four wheel sensors WSS_VL, WSS_VR, WSS_HL, WSS_HR each comprise a sensor arrangement 10 described with reference to FIGS. 1 to 4.As can be further seen from FIG. 5, the individual wheel sensors WSS_VL, WSS_VR, WSS_HL, WSS_HR each have a drive circuit 3 and a switching transistor ST, via which the respective sensor arrangement 10 can be connected to the supply voltage VPP. The two control units ECU 1, ECU 2 activate the sensor arrangement 10 of the corresponding wheel sensor WSS_VL, WSS_VR, WSS_HL, WSS_HR via the control circuit 3 and the switching transistor ST. For this purpose, the first control unit ECU 1 is connected to a first control input S 1 of the individual wheel sensors WSS_VL, WSS_VR, WSS_HL, WSS_HR. The second control unit ECU 2 is connected to a second control input S 2 of the individual wheel sensors WSS_VL, WSS_VR, WSS_HL, WSS_HR. In this case, the individual wheel sensors WSS_VL, WSS_VR, WSS_HL, WSS_HR are activated when the first control unit ECU 1 and / or the second control unit ECU 2 actuate the corresponding drive circuit 3.As can be further seen from FIG. 5, in the exemplary embodiment shown, the outputs of the sensor arrangements 10, at which the sensor current IS is output in each case, are connected to ground via an ohmic resistor RSB, which limits the sensor current IS in the event of a fault. The outputs of the sensor arrangements 10, at which the first measurement current I 1 is output in each case, are connected in each case to the first control unit ECU 1. The outputs of the sensor arrangements 10, at which the second measurement current I2 is output in each case, are connected in each case to the second control unit ECU2. Since both control units ECU 1, ECU 2 receive the first measurement current I 1 or the second measurement current I 2 of the sensor arrangement 10 of the corresponding wheel sensor WSS_VL, WSS_VR, WSS_HL, WSS_HR, these can carry out different braking functions in normal operation. In the event of a failure of one of the control units ECU 1, ECU 2, it is possible for the other control unit ECU 1, ECU 2 to assume the braking functions of the failed control unit ECU 1, ECU 2.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 204 599 A1

[0003]

Claims

Sensor arrangement (10) for a vehicle (1), having a sensor element (14), an ohmic shunt resistor (RS) which is arranged electrically in series with the sensor element (14), and a current mirror circuit (12) which is designed to generate at least two measurement currents (I1, I2) from a sensor current (IS) which flows through the sensor element (14) and the shunt resistor (RS) and is modulated with information about a detected measurement variable, said measurement currents representing the detected measurement variable and each being able to be output to a control unit (ECU1, ECU2).Sensor arrangement (10) according to Claim 1, characterized in that the at least two measurement currents (I1, I2) each flow through an ohmic measurement resistor (R1, R2).Sensor arrangement (10) according to Claim 2, characterized in that a corresponding ratio (I1 / IS, 12 / IS) of the respective measurement current (I1, I2) to the sensor current (IS) can be predefined in each case via a ratio (RS / R1, RS / R2) of the shunt resistor (RS) to the respective measurement resistor (R1, R2).Sensor arrangement (10) according to one of Claims 1 to 3, characterized in that the current mirror circuit (12) comprises at least two differential amplifiers (16) and at least two actuating elements (18), which are each arranged electrically in series with one of the measuring resistors (R1, R2) and are each assigned to one of the differential amplifiers (16), wherein a voltage representing the sensor current (IS) is each applied to a reference input of the at least two differential amplifiers (16), and a measuring input of the at least two differential amplifiers (16) is each connected to a connection point between the corresponding measuring resistor (R1, R2) and the assigned actuating element (18), wherein the at least two differential amplifiers (16) are designed to set a corresponding one of the at least two measuring currents (I1, I2) via the assigned actuating element (18) on the basis of the sensor current (IS).Sensor arrangement (10) according to one of Claims 1 to 3, characterized in that the current mirror circuit (12) comprises a differential amplifier (16) and at least two actuating elements (18), which are each arranged electrically in series with one of the measuring resistors (R1, R2) and are each connected to an output of the differential amplifier (16), wherein a voltage representing the sensor current (IS) is applied to a reference input of the differential amplifier (16) and a measurement input of the differential amplifier (16) is connected to one of the connection points between the corresponding measuring resistor (R1, R2) and the associated actuating element (18), wherein the differential amplifier (16) is designed to set the at least two measuring currents (I1, I2) via the at least two actuating elements (18) on the basis of the sensor current (IS).Sensor arrangement (1) according to Claim 4 or 5, characterized in that the at least two actuating elements (18) are each designed as transistors (T1, T2).Sensor arrangement (10) according to one of Claims 1 to 3, characterized in that the current mirror circuit (12) comprises a reference element (19) which is arranged electrically in series with the shunt resistor (RS), and at least two actuating elements (18) which are each arranged electrically in series with one of the measuring resistors (R1, R2) and are each connected to an output of the reference element (19), wherein the reference element (19) is designed to set the at least two measuring currents (I1, I2) via the at least two actuating elements (18) on the basis of the sensor current (IS).Sensor arrangement (1) according to Claim 7, characterized in that the reference element (19) and the at least two actuating elements (18) are each designed as transistors (T1, T2, T3) having a high current amplification of more than 500.Sensor arrangement (1) according to one of Claims 2 to 8, characterized in that the shunt resistor (RS) has a resistance value in the range from 10 to 20 Ohm or in the range from 50 to 100 Ohm.Sensor arrangement (1) according to one of Claims 2 to 9, characterized in that the at least two measuring resistors (R1, R2) each have a resistance value in the range from 50 to 100 Ohm or in the range from 5 to 10 Kilo Ohm.Sensor arrangement (1) according to one of Claims 1 to 10, characterized in that the sensor element (14) is designed to detect at least one rotational speed and / or rotational speed of a moving body.Vehicle (1) having four wheel sensors (WSS_VL, WSS_VR, WSS_HL, WSS_HR) which are each assigned to a vehicle wheel and are designed to detect a rotational speed and / or rotational speed of the assigned vehicle wheel, and at least two control units (ECU1, ECU2) which are each coupled to the four wheel sensors (WSS_VL, WSS_VR, WSS_HL, WSS_HR), wherein the four wheel sensors (WSS_VL, WSS_VR, WSS_HL, WSS_HR) each have a sensor arrangement (10) which are designed according to one of Claims 1 to 11.

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