CN210123445U

CN210123445U - Wheel speed sensor

Info

Publication number: CN210123445U
Application number: CN201790000758.2U
Authority: CN
Inventors: A·席尔林; B·皮勒; A·内茨; P·施陶德尔
Original assignee: Continental Teves AG and Co OHG
Current assignee: Continental Automotive Technologies GmbH
Priority date: 2016-04-15
Filing date: 2017-03-27
Publication date: 2020-03-03
Anticipated expiration: 2027-03-27
Also published as: DE102016206390A1; WO2017178216A1

Abstract

The utility model relates to a wheel speed sensor (100) for installing on axle, this wheel speed sensor includes conductor carrier (101), first magnetic sensor element (103-1), and second magnetic sensor element (103-2), first magnetic sensor element (103-1) and second magnetic sensor element (103-2) are arranged on this conductor carrier (101), for example are arranged on the lead frame of being made by copper. The first magnetic sensor element (103-1) is designed to detect a first periodic measurement signal based on an alternating magnetic field, and the second magnetic sensor element (103-2) is designed to detect a second periodic measurement signal based on the alternating magnetic field. The first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are designed to detect the first periodic measurement signal and the second periodic measurement signal in a phase-shifted manner. The sensor elements may be rotated, for example, by 45 ° relative to one another, whereby a phase shift of 90 ° may be achieved. By analyzing these two signals, a larger signal frequency and higher resolution can be achieved.

Description

Wheel speed sensor

Technical Field

The invention relates to the field of sensor systems in the technical field of vehicle driving. More particularly, the present invention relates to a wheel speed sensor for mounting on an axle.

Background

Wheel speed sensors in vehicles transmit signals to a control unit of a safety system such as an anti-lock brake system (ABS) or an electronic stability control system (ESP). Information such as individual wheel speeds or wheel speeds of the wheels of the vehicle and vehicle speed may be determined from the signals.

The principle of detecting the wheel speed is usually based on the evaluation of the magnetic signal of an encoder wheel which is fixedly connected to the wheel axle by a magneto-sensitive measuring element in the form of a resistive bridge. In this case, the signal of the wheel speed sensor is forwarded to the control unit via a cable connection.

In the field of Highly Automated Driving (HAD), particularly stringent requirements are placed on the many sensors in the vehicle. For example, wheel speed sensors must be configured in a redundant manner to be able to quickly identify and compensate for faults or failures. Furthermore, the wheel speed sensor is intended to have as high a measurement accuracy and resolution as possible, in order to be able to achieve improved lane keeping and automatic parking. However, it is difficult to meet these stringent requirements with conventional wheel speed sensors.

Disclosure of Invention

It is therefore an object of the present invention to provide an efficient concept of a wheel speed sensor which firstly meets the safety requirements of autonomous driving and secondly enables detection of wheel movements with high resolution.

This object is achieved by the subject matter of the independent claims. The dependent claims, the description and the drawings relate to advantageous embodiments of the invention.

The sensor systems and sensor elements presented in the following text may be of different kinds. The individual elements described may be implemented by hardware and/or software components (e.g., electronic components) that may be produced by various techniques and include, for example, semiconductor chips, ASICs, microprocessors, digital signal processors, integrated circuits, opto-electronic circuits, and/or passive component parts.

The solution presented below is based on a wheel speed sensor comprising two magnetic sensor elements, which may each be in electrical contact individually. This embodiment can be implemented in a housing that is as compact as possible.

According to a first aspect, the invention relates to a wheel speed sensor for mounting on a vehicle axle, having a conductor carrier, a first magnetic sensor element and a second magnetic sensor element, wherein the first and second magnetic sensor elements are arranged on the conductor carrier, wherein the first magnetic sensor element is configured to detect a first periodic measurement signal based on an alternating magnetic field, and wherein the second magnetic sensor element is configured to detect a second periodic measurement signal based on the alternating magnetic field, and wherein the first and second magnetic sensor elements are configured to detect the first and second periodic measurement signals with a phase shift. This provides the advantages of: since the wheel speed sensor includes two magnetic sensor elements, it is possible to provide a wheel speed sensor that meets safety requirements for automatic driving. In this case, one of the two magnetic sensor elements may function as a redundant sensor. Furthermore, due to the phase shift between the measurement signals, wheel rotations or wheel movements can be detected with increased, in particular doubled, resolution.

Since the magnetic sensor elements are arranged on the same conductor carrier, the wheel speed sensor is constructed sufficiently compact so that it takes up only a little more space than a system comprising a single magnetic sensor element and can therefore be fitted simply to the axle of a vehicle. The axle may have a stub axle (Achsschenkel). The wheel speed sensor may be arranged and/or mounted on the stub shaft.

The first and second periodic measurement signals may be identical except for a phase shift. The first periodic measurement signal and the second periodic measurement signal may each be sine or cosine signals, which are phase shifted by 90 °.

The alternating magnetic field may be generated by a magnetic encoder wheel (e.g., a multi-pole ring). The encoder wheel may have a plurality of magnets with alternating pole orientations. As the encoder wheel rotates, the magnetic sensor element of the wheel speed sensor may detect the alternating magnetic field of these magnets. These periodic measurement signals may be based on a physical measurement variable detected by the magnetic sensor element when a magnet with alternating pole orientation passes. This alternating signal may be converted into a periodic measurement signal by electronics in the wheel speed sensor.

According to an embodiment, the first magnetic sensor element comprises a first resistive bridge for detecting the first periodic measurement signal and the second magnetic sensor element comprises a second resistive bridge for detecting the second periodic measurement signal. This provides the advantages of: the first and second periodic measurement signals may be efficiently detected.

According to one embodiment, the first and the second resistance bridge are arranged on the conductor carrier in a manner rotated relative to one another, in particular rotated by 45 °, in order to detect the first and the second periodic measurement signal with a phase shift, in particular a phase shift of 90 °, relative to one another. This provides the advantages of: the first and second periodic measurement signals may be efficiently detected. Furthermore, the resistance bridges can be configured to be structurally identical, and in particular can have the same measured resistance, except for being rotated relative to one another.

According to one embodiment, the first magnetic sensor element and the second magnetic sensor element comprise in each case an AMR sensor element, a GMR sensor element or a hall sensor element. This provides the advantages of: these magnetic sensor elements can effectively detect these periodic measurement signals.

These magnetic sensor elements may be active or passive electronic components. For example, active hall sensor elements allow a large air gap and react even to small changes in the magnetic field, so that very accurate wheel speed measurements can be achieved with them.

According to an embodiment, the conductor carrier has a first surface and a second surface facing away from the first surface, wherein the first magnetic sensor element is arranged on the first surface and wherein the second magnetic sensor element is arranged on the second surface, or wherein the first magnetic sensor element and the second magnetic sensor element are arranged on the same surface of the conductor carrier. This provides the advantages of: a particularly compact wheel speed sensor can be realized.

According to one embodiment, the wheel speed sensor comprises a first circuit and a second circuit, wherein the first circuit is electrically connected to the first magnetic sensor element for measurement value adjustment, and wherein the second circuit is electrically connected to the second magnetic sensor element for measurement value adjustment.

By means of the associated circuits, the measurement signals of the magnetic sensor elements can be conditioned and converted into, for example, digital measurement signals. Furthermore, the measurement signals can be adapted to an interface with a control unit. The circuit may also provide respective EMC compatibility of these measurement signals, thereby complying with respective EMC guidelines.

According to an embodiment, the first and second magnetic sensor elements are configured to detect the respective measurement signals as sinusoidal measurement signals, wherein the first and second circuits are configured to convert the respective sinusoidal measurement signals into rectangular signals.

According to an embodiment, the first circuit and the second circuit are arranged on the conductor carrier. This provides the advantages of: a particularly compact wheel speed sensor can be realized.

According to one embodiment, the conductor carrier comprises a lead frame, wherein the lead frame is shaped from metal, in particular copper.

According to an embodiment, the magnetic sensor elements are configured to detect the periodic measurement signals based on an alternating magnetic field of a magnetic read track (Lesespur), wherein the magnetic read track is formed by an encoder wheel arranged on the axle. This provides the advantages of: the wheel rotational speed can be effectively detected based on the alternating magnetic field of the encoder wheel.

An encoder wheel with a magnetic read track may include a multi-pole ring in which magnets with alternating pole orientations may be used. The surface of the multipole ring facing away from the axle can have or form a read track. The multi-pole ring may be used in a seal ring of a wheel bearing of a vehicle. The alternating magnetic field may be generated as the wheel and an encoder wheel or multi-pole ring mounted on the wheel rotate.

According to an embodiment, the first magnetic sensor element and the second magnetic sensor element are arranged at an end side of the conductor carrier. This provides the advantages of: these periodic measurement signals can be detected efficiently.

According to one embodiment, the wheel speed sensor is configured to transmit the first periodic measurement signal to a first controller of a vehicle and to transmit the second periodic measurement signal to a second controller of the vehicle, wherein the first controller is configured to determine a first wheel speed based on the first periodic measurement signal, and wherein the second controller is configured to determine a second wheel speed based on the second periodic measurement signal. This provides the advantages of: the wheel speed can be effectively detected by two redundant controllers. Thus, not only the magnetic sensor elements themselves but also the associated controllers can be configured in a redundant manner.

The first controller and the second controller may each comprise a processor or microprocessor. For the purpose of energy supply, the first controller and the second controller may each be connected to a separate energy source or to a common energy source, in particular a vehicle battery.

Furthermore, the first controller and the second controller may be identical, and/or the first controller and the second controller may be components of a common controller of the motor vehicle. These controllers may be part of a safety system of the vehicle, such as an ABS or an ESP.

According to an embodiment, the first periodic measurement signal comprises a plurality of first periodic signal pulses and the second periodic measurement signal comprises a plurality of second periodic signal pulses, wherein the first controller and the second controller or a common controller superior to the first controller and the second controller is configured to detect the first periodic signal pulses and the second periodic signal pulses, in particular with a phase shift, and to determine wheel movement based on the first periodic signal pulses and the second periodic signal pulses. This provides the advantages of: wheel movement can be determined with high resolution. Each signal pulse may be assigned to a change in the alternating magnetic field of the read track, for example due to the passage of a magnetic pole of the read track. Each change in the magnetic field can be detected twice separately due to the phase shift between these signal pulses. Therefore, the detection resolution of the wheel movement can be increased, particularly doubled.

According to one embodiment, the wheel speed sensor can be connected to the first controller by a first conductor means for transmitting the first periodic measurement signal, and the wheel speed sensor can be connected to the second controller by a second conductor means for transmitting the second periodic measurement signal. This provides the advantages of: for the purpose of determining the wheel speed, the detected measurement signals can be correspondingly transmitted effectively to the first and second controllers.

According to one embodiment, the wheel speed sensor comprises a first electrical terminal for connecting the first conductor arrangement and a second electrical terminal for connecting the second conductor arrangement. This provides the advantages of: for the purpose of determining the wheel speed, the detected measurement signals can be correspondingly transmitted effectively to the first and second controllers.

The present invention may be implemented in hardware and/or software.

Drawings

Further exemplary embodiments are explained in more detail with reference to the drawings. In the drawings:

FIG. 1a shows a top view and a side view of a wheel speed sensor;

FIG. 1b shows top and side views of a wheel speed sensor;

FIG. 2a shows a schematic view of a magnetic sensor element;

FIG. 2b shows a schematic representation of a circuit; and is

FIG. 3 shows a schematic representation of a wheel speed sensor and controller of a vehicle.

Reference numerals

100 wheel speed sensor

101 conductor carrier

103-1 first magnetic sensor element

103-2 second magnetic sensor element

105-1 first circuit

105-2 first circuit

107-1 first conductor arrangement

107-2 second conductor arrangement

201-1 first resistance bridge

201-2 second resistance bridge

203-1 voltage control

203-2 voltage control

205-1 amplifier

205-2 amplifier

207-1 schmitt trigger

207-2 schmitt trigger

209-1 switchable current source

209-2 switchable current source

211-1 constant current source

211-2 constant current source

300 wheel speed sensor

301-1 first magnetic sensor element

301-2 second magnetic sensor element

303-1 first controller

303-2 second controller

305-1 energy source

305-2 energy source

Detailed Description

In the following detailed description, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the spirit of the present invention. The following detailed description is, therefore, not to be taken in a limiting sense. Also, it is understood that features of the various exemplary embodiments described herein may be combined with each other, unless explicitly stated otherwise.

The aspects and embodiments are described with reference to the drawings, wherein like reference numerals generally refer to like elements. In the following description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of one or more aspects of the present invention. It will be apparent, however, to one skilled in the art that one or more aspects or embodiments may be practiced with a lesser degree of particularity. In other instances, well-known structures and elements are shown in schematic form in order to facilitate describing one or more aspects or embodiments. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the spirit of the present invention.

While a particular feature or aspect of an embodiment may have been disclosed with respect to only one of several implementations, such feature or aspect may be combined with one or more other features or aspects of the other implementations as may be desired and advantageous for any given or particular application. Furthermore, the expressions "comprising", "having" or other variants thereof are used in the detailed description or the claims, to the extent that these expressions are intended to be open-ended in a manner similar to the expression "comprising". The expressions "coupled" and "connected" may be used together with their derivatives. It will be understood that such expressions are used to state that two elements co-operate or interact with each other, whether or not they are in direct physical or electrical contact, or not in direct contact with each other. Additionally, the expression "exemplary" should be interpreted merely as an example and not to indicate the best or optimal case. The following description is, therefore, not to be taken in a limiting sense.

Fig. 1a shows a top view and a side view of a wheel speed sensor 100 for mounting on a vehicle axle according to one embodiment.

The wheel speed sensor 100 comprises a conductor carrier 101, a first magnetic sensor element 103-1 and a second magnetic sensor element 103-2, wherein the first magnetic sensor element 103-1 and the second magnetic sensor element 103-2 are arranged on the conductor carrier 101, wherein the first magnetic sensor element 103-1 is configured to detect a first periodic measurement signal based on an alternating magnetic field, and wherein the second magnetic sensor element 103-2 is configured to detect a second periodic measurement signal based on the alternating magnetic field, and wherein the first magnetic sensor element 103-1 and the second magnetic sensor element 103-2 are configured to detect the first periodic measurement signal and the second periodic measurement signal with a phase shift.

The two magnetic sensor elements 103-1, 103-2 may function as redundant sensor elements. Thus, the requirement for two independent or redundant wheel speed sensors for High Automatic Drive (HAD) may be met. Furthermore, due to the phase shift between the measurement signals of the first magnetic sensor element 103-1 and the second magnetic sensor element 103-2, a wheel rotation or a wheel movement may be detected with an increased, in particular doubled, resolution based on the first periodic measurement signal and the second periodic measurement signal.

Since the magnetic sensor elements 103-1, 103-2 are arranged on the same conductor carrier 101, the wheel speed sensor 100 is constructed sufficiently compact so that it takes up only a little more space than a system comprising a single magnetic sensor element and can therefore be fitted simply to the axle of a vehicle. The axle may have a stub axle. The wheel speed sensor 100 may be arranged and/or mounted on a stub shaft.

The magnetic sensor elements 103-1, 103-2 may be configured to detect these periodic measurement signals based on the alternating magnetic field of the magnetic read track. The magnetic read track may be formed by an encoder wheel arranged on the axle. An encoder wheel with a magnetic read track may include a multi-pole ring in which magnets with alternating pole orientations may be used. The surface of the multipole ring facing away from the axle can have or form a read track. The multi-pole ring may be used in a seal ring of a wheel bearing of a vehicle.

As the encoder wheel rotates, the magnetic sensor elements 103-1, 103-2 of the wheel speed sensor 100 may detect the alternating magnetic field of the read track. The periodic measurement signals may comprise or may be based on physical measurement variables which are detected by the magnetic sensor elements when sections of the read track pass in alternating pole directions. This alternating signal can be converted by electronics in the wheel speed sensor 100 into a periodic measurement signal, in particular a digital measurement signal. The measurement signal can be transmitted to the control unit as a current signal in a pulse width modulation method or as a voltage signal.

The first and second periodic measurement signals may be identical except for a phase shift. The first periodic measurement signal and the second periodic measurement signal may each be a sine or cosine signal, which are phase-shifted by 90 ° with respect to each other.

The first magnetic sensor element 103-1 and/or the second magnetic sensor element 103-2 may each comprise an AMR sensor element, a GMR sensor element or a hall sensor element. The magnetic sensor elements 103-1, 103-2 may be active or passive electronic components.

Therefore, physical measurement principles such as AMR (anisotropic magnetoresistive effect), GMR (giant magnetoresistive effect) and hall can be applied in order to detect these periodic measurement signals. Furthermore, other measurement principles like TMR (tunnel magneto resistance effect) can be applied with suitable magnetic sensor elements.

According to one embodiment, the first magnetic sensor element 103-1 and the second magnetic sensor element 103-2 are each arranged at an end side of the conductor carrier 101, in particular at an end side facing the magnetic reading track.

The conductor carrier 101 may comprise a lead frame. The lead frame may be comb-shaped or frame-shaped, and may be formed of metal, particularly copper.

The wheel speed sensor 100 of FIG. 1a also includes a first circuit 105-1 and a second circuit 105-2. The first circuit 105-1 may be electrically connected to the first magnetic sensor element 103-1 for measurement value conditioning, and the second circuit 105-2 may be electrically connected to the second magnetic sensor element 103-2 for measurement value conditioning.

The first circuit 105-1 and the second circuit 105-2 may be arranged on a conductor carrier 101.

FIG. 1a also shows a first conductor arrangement 107-1 connected to the first circuit 105-1, and a second conductor arrangement 107-2 connected to the second circuit 107-2. The first and second conductor arrangements 107-1, 107-2 may transmit the first and second periodic measurement signals, respectively, to a controller (ECU, electronic control unit) of the vehicle, for example, in order to determine the wheel rotational speed on the basis of these measurement signals.

Fig. 1b shows a top view and a side view of a wheel speed sensor 100 for mounting on a vehicle axle according to another embodiment.

In the embodiment of the wheel speed sensor in fig. 1b, a first magnetic sensor element 103-1 is arranged on a first surface of the conductor carrier 101 and a second magnetic sensor element 103-2 is arranged on a second surface of the conductor carrier 101, said surfaces facing away from the first surface. Since the magnetic sensor elements 103-1, 103-2 are arranged on two opposite sides of the conductor carrier 101, the conductor carrier 101 and thus the wheel speed sensor 100 can be configured particularly compactly.

In this case, the circuits 105-1, 105-2 may also be arranged on different surfaces of the conductor carrier 101, or on the same surface of the conductor carrier 101 as shown in fig. 1 b.

The wheel speed sensor 100 may comprise a sensor housing, wherein the conductor carrier 101 is arranged in the sensor housing. The sensor housing can be a plastic housing, in particular an injection-molded housing, which is fastened to the conductor carrier 101, in particular by means of a material-fixed connection.

Fig. 2a shows a schematic view of a magnetic sensor element 103-1, 103-2 according to an embodiment.

The first magnetic sensor element 103-1 comprises a first resistive bridge 201-1 and the second magnetic sensor element 103-2 comprises a second resistive bridge 201-2. The first resistive bridge 201-1 and the second resistive bridge 201-2 may be integrated in a circuit, in particular in the same circuit, as shown in fig. 2 a.

The first resistive bridge 201-1 and the second resistive bridge 201-2 may be configured as a wheatstone measurement bridge.

The first resistive bridge 201-1 may be configured to detect a first periodic measurement signal and the second resistive bridge 201-2 may be configured to detect a second periodic measurement signal. In this case, the first resistance bridge 201-1 and the second resistance bridge 201-2 can be configured in such a way that they detect the periodic measurement signals with a phase shift, in particular a phase shift of 90 °. The first and second periodic measurement signals may be identical except for a phase shift.

The first resistive bridge 201-1 and the second resistive bridge 201-2 can be arranged offset or rotated by 45 ° with respect to each other. This arrangement of resistive bridges 201-1, 201-2 is similar to a magnetoresistive angle sensor. The phase shift of the detected periodic measurement signal of the alternating magnetic field may be generated by an offset or a rotation of the resistive bridge 201-1, 201-2. The measurement signals may be identical except for the phase shift. The first periodic measurement signal may be a sine signal and the second periodic measurement signal may be a cosine signal, wherein the sine signal and the cosine signal may have the same amplitude.

The resistive bridges 201-1, 201-2 may be configured to be structurally identical, and in particular may have the same measured resistance, except for being offset or rotated relative to each other.

The two offset magnetic sensor elements 103-1, 103-2 or the resistive bridges 201-1, 201-2 may be implemented to be galvanically isolated from each other.

FIG. 2b shows a schematic illustration of the circuits 105-1, 105-2 for measurement value adjustment according to one embodiment.

The first circuit 105-1 is electrically connected to the first magnetic sensor element 103-1, in particular the first resistive bridge 201-1, and the second circuit 105-2 is electrically connected to the second magnetic sensor element 103-2, in particular the second resistive bridge 201-2.

The circuits 105-1, 105-2 may be configured for measurement value conditioning of the first and second periodic measurement signals.

To this end, the circuits 105-1, 105-2 may each comprise a voltage control 203-1, 203-2, which is configured, for example, for setting the switching point of the magnetic sensor elements 103-1, 103-2 or the resistive bridges 201-1, 201-2. The circuits 105-1, 105-2 may also comprise schmitt triggers 207-1, 207-2 in each case for converting sinusoidal measurement signals into rectangular signals and switchable current sources 209-1, 209-2 and constant current sources 211-1, 211-2 in each case for converting voltage-based measurement signals into current measurement signals.

The circuits 105-1, 105-2 may also convert the measurement signals of the magnetic sensor elements 103-1, 103-2 into digital measurement signals and/or adapt these measurement signals to an interface with a control unit. The circuits 105-1, 105-2 may provide measurement signals with EMC compatibility so as to comply with corresponding EMC guidelines.

FIG. 3 shows a schematic representation of a

wheel speed sensor

100, 300 and a controller 303-1, 303-2 of a vehicle according to one embodiment.

The

wheel speed sensors

100, 300 may be mounted at different locations on the vehicle, such as on stub shafts of different wheels of the vehicle. Furthermore, an additional redundant wheel speed sensor may be fitted to the vehicle; for example, a redundant wheel speed sensor is fitted to each stub shaft of the vehicle.

The two

wheel speed sensors

100, 300 shown in fig. 3 are redundant

wheel speed sensors

100, 300, each of which includes a first magnetic sensor element 103-1, 301-1 and a second magnetic sensor element 103-2, 301-2.

In fig. 3, the first magnetic sensor element 103-1 of the wheel speed sensor 100 is connected to the first controller 303-1(ECU 1) through the first conductor device 107-1, and the second magnetic sensor element 103-2 of the wheel speed sensor 100 is connected to the second controller 303-2(ECU 2) through the second conductor device 107-2. The magnetic sensor elements 301-1, 301-2 of the wheel speed sensor 300 are also connected to the controllers 303-1, 303-2 by conductor means.

The first conductor arrangement 107-1 and the second conductor arrangement 107-2 may each comprise a bipolar electrical connection cable with a voltage supply line and another line. This other line may be used as a sensor ground. The sensor signals, in particular the periodic measurement signals, can be transmitted simultaneously via the voltage supply lines.

The

wheel speed sensor

100, 300 may comprise a first electrical terminal and a second electrical terminal, wherein the first conductor arrangement 107-1 is connectable to the first electrical terminal and the second conductor arrangement 107-2 is connectable to the second electrical terminal.

The first periodic measurement signal of the first magnetic sensor element 103-1 may be transmitted to the first controller 303-1 via the first electrical terminal and the first conductor arrangement 107-1. In the same way, the second periodic measurement signal of the second magnetic sensor element 103-2 may be transmitted to the second controller 303-2 via the second electrical terminal and the second conductor arrangement 107-2.

The first controller 303-1 and the second controller 303-2 may each comprise a processor or microprocessor. For the purpose of energy supply, the first controller 303-1 and the second controller 303-2 may each be connected to a separate energy source 305-1, 305-2 or to a common energy source, in particular a vehicle battery.

The first controller 303-1 and the second controller 303-2 may be identical. Further, the first controller 303-1 and the second controller 303-2 may be components of a common controller of the motor vehicle. The controllers 303-1, 303-2 may be part of a safety system of the vehicle, such as an ABS or an ESP.

The first controller 303-1 may be configured to determine a first wheel speed based on the first periodic measurement signal, and the second controller 303-2 may be configured to determine a second wheel speed based on the second periodic measurement signal. In this manner, a redundant wheel speed sensor system may be provided, comprising: redundant sensor elements 103-1, 103-2 for measurement value detection, redundant circuits 105-1, 105-2 for measurement value regulation, and redundant controllers 303-1, 303-2 for vehicle speed determination.

The first periodic measurement signal may include a plurality of first periodic signal pulses and the second periodic measurement signal may include a plurality of second periodic signal pulses. In this case, the respective signal pulse may correspond to a magnetic pole passing the corresponding magnetic sensor element 103-1, 103-2. The magnetic sensor elements 103-1, 103-2 likewise detect these periodic signal pulses with a phase shift of the measuring signal.

According to one embodiment, the first controller 303-1 and/or the second controller 303-2 and/or the common controller at the upper level of the first controller 303-1 and the second controller 303-2 is configured to detect the first periodic signal pulses and the second periodic signal pulses with a phase shift and to determine the wheel movement based on the first periodic signal pulses and the second periodic signal pulses.

For example, if the first and second periodic measurement signals are phase shifted by 90 ° with respect to each other, the resolution of the detected wheel movement may be doubled compared to measurements with only one measurement signal, since each change in the alternating magnetic field of the read track (e.g., each pass of a magnetic pole of the read track) is detected twice due to the phase shift.

Claims

1. A wheel speed sensor (100) for mounting on an axle, the wheel speed sensor having:

a conductor carrier (101);

a first magnetic sensor element (103-1) and a second magnetic sensor element (103-2), wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are arranged on the conductor carrier (101);

wherein the first magnetic sensor element (103-1) is configured to detect a first periodic measurement signal based on an alternating magnetic field, and wherein the second magnetic sensor element (103-2) is configured to detect a second periodic measurement signal based on the alternating magnetic field; and is

Wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are configured to detect the first periodic measurement signal and the second periodic measurement signal with a phase shift;

wherein the conductor carrier (101) has a first surface and a second surface facing away from the first surface, wherein the first magnetic sensor element (103-1) is arranged on the first surface, and wherein the second magnetic sensor element (103-2) is arranged on the second surface, or wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are arranged on the same surface of the conductor carrier (101).

2. The wheel speed sensor (100) of claim 1, wherein the first magnetic sensor element (103-1) comprises a first resistive bridge (201-1) for detecting the first periodic measurement signal, and wherein the second magnetic sensor element (103-2) comprises a second resistive bridge (201-2) for detecting the second periodic measurement signal.

3. The wheel speed sensor of claim 2, wherein the first resistive bridge (201-1) and the second resistive bridge (201-2) are arranged on the conductor carrier (101) in a manner rotated by a prescribed angle with respect to each other in order to detect the first periodic measurement signal and the second periodic measurement signal with a prescribed phase shift with respect to each other.

4. The wheel speed sensor of claim 3, wherein the prescribed angle is 45 °.

5. The wheel speed sensor of claim 3, wherein the prescribed phase shift is a phase shift of 90 °.

6. The wheel speed sensor (100) of any of claims 1-5, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) comprise in each case an AMR sensor element, a GMR sensor element or a Hall sensor element.

7. The wheel speed sensor (100) of claim 1, wherein the wheel speed sensor (100) comprises a first circuit (105-1) and a second circuit (105-2), wherein the first circuit (105-1) is electrically connected to the first magnetic sensor element (103-1) for measurement value adjustment, and wherein the second circuit (105-2) is electrically connected to the second magnetic sensor element (103-2) for measurement value adjustment.

8. The wheel speed sensor (100) of claim 7, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are configured to detect the respective measurement signals as sinusoidal measurement signals, wherein the first circuit (105-1) and the second circuit (105-2) are configured to convert the respective sinusoidal measurement signals into rectangular signals.

9. The wheel speed sensor (100) of claim 7 or 8, wherein the first circuit (105-1) and the second circuit (105-2) are arranged on the conductor carrier (101).

10. The wheel speed sensor (100) of claim 1, wherein the conductor carrier (101) comprises a lead frame, wherein the lead frame is formed of metal.

11. The wheel speed sensor (100) of claim 1, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are configured to detect the periodic measurement signals based on an alternating magnetic field of a magnetic read track, wherein the magnetic read track is formed by an encoder wheel arranged on the axle.

12. The wheel speed sensor (100) of claim 1, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are arranged at an end side of the conductor carrier (101).

13. The wheel speed sensor (100) of claim 1, wherein the wheel speed sensor (100) is configured to transmit the first periodic measurement signal to a first controller (303-1) of a vehicle and to transmit the second periodic measurement signal to a second controller (303-2) of the vehicle, wherein the first controller (303-1) is configured to determine a first wheel speed based on the first periodic measurement signal, and wherein the second controller (303-2) is configured to determine a second wheel speed based on the second periodic measurement signal.

14. The wheel speed sensor (100) of claim 13, wherein the first periodic measurement signal includes a plurality of first periodic signal pulses, and wherein the second periodic measurement signal includes a plurality of second periodic signal pulses, wherein the first controller (303-1) and the second controller (303-2) or a common controller superior to the first controller (303-1) and the second controller (303-2) is configured to detect the first periodic signal pulses and the second periodic signal pulses, and determine wheel movement based on the first periodic signal pulses and the second periodic signal pulses.

15. The wheel speed sensor (100) of claim 14, wherein the first controller (303-1) and the second controller (303-2) or a common controller at a higher level of the first controller (303-1) and the second controller (303-2) is configured to detect the first periodic signal pulses and the second periodic signal pulses with a phase shift.

16. The wheel speed sensor (100) of claim 13 or 14, wherein the wheel speed sensor (100) is connectable to the first controller (303-1) via a first conductor arrangement (107-1) for transmitting the first periodic measurement signal, and wherein the wheel speed sensor (100) is connectable to the second controller (303-2) via a second conductor arrangement (107-2) for transmitting the second periodic measurement signal.

17. The wheel speed sensor (100) of claim 16, wherein the wheel speed sensor (100) includes a first electrical terminal for connecting the first conductor arrangement (107-1) and a second electrical terminal for connecting the second conductor arrangement (107-2).

18. A wheel speed sensor (100) for mounting on an axle, the wheel speed sensor having:

a conductor carrier (101);

wherein the wheel speed sensor (100) comprises a first circuit (105-1) and a second circuit (105-2), wherein the first circuit (105-1) is electrically connected to the first magnetic sensor element (103-1) for measurement value adjustment, and wherein the second circuit (105-2) is electrically connected to the second magnetic sensor element (103-2) for measurement value adjustment; the first circuit (105-1) and the second circuit (105-2) are arranged on the conductor carrier (101).

19. The wheel speed sensor (100) of claim 18, wherein the first magnetic sensor element (103-1) comprises a first resistive bridge (201-1) for detecting the first periodic measurement signal, and wherein the second magnetic sensor element (103-2) comprises a second resistive bridge (201-2) for detecting the second periodic measurement signal.

20. The wheel speed sensor of claim 19, wherein the first resistive bridge (201-1) and the second resistive bridge (201-2) are arranged on the conductor carrier (101) in a manner rotated by a prescribed angle with respect to each other in order to detect the first periodic measurement signal and the second periodic measurement signal with a prescribed phase shift with respect to each other.

21. The wheel speed sensor of claim 20, wherein the prescribed angle is 45 °.

22. The wheel speed sensor of claim 20, wherein the prescribed phase shift is a phase shift of 90 °.

23. The wheel speed sensor (100) of any of claims 18 to 22, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) comprise in each case an AMR sensor element, a GMR sensor element or a hall sensor element.

24. The wheel speed sensor (100) of claim 18, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are configured to detect the respective measurement signals as sinusoidal measurement signals, wherein the first circuit (105-1) and the second circuit (105-2) are configured to convert the respective sinusoidal measurement signals into rectangular signals.

25. The wheel speed sensor (100) of claim 18, wherein the conductor carrier (101) comprises a lead frame, wherein the lead frame is formed of metal.

26. The wheel speed sensor (100) of claim 18, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are configured to detect the periodic measurement signals based on an alternating magnetic field of a magnetic read track, wherein the magnetic read track is formed by an encoder wheel arranged on the axle.

27. The wheel speed sensor (100) of claim 18, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are arranged at an end side of the conductor carrier (101).

28. The wheel speed sensor (100) of claim 18, wherein the wheel speed sensor (100) is configured to transmit the first periodic measurement signal to a first controller (303-1) of a vehicle and to transmit the second periodic measurement signal to a second controller (303-2) of the vehicle, wherein the first controller (303-1) is configured to determine a first wheel speed based on the first periodic measurement signal, and wherein the second controller (303-2) is configured to determine a second wheel speed based on the second periodic measurement signal.

29. The wheel speed sensor (100) of claim 28, wherein the first periodic measurement signal includes a plurality of first periodic signal pulses, and wherein the second periodic measurement signal includes a plurality of second periodic signal pulses, wherein the first controller (303-1) and the second controller (303-2) or a common controller superior to the first controller (303-1) and the second controller (303-2) is configured to detect the first periodic signal pulses and the second periodic signal pulses, and determine wheel movement based on the first periodic signal pulses and the second periodic signal pulses.

30. The wheel speed sensor (100) of claim 29, wherein the first controller (303-1) and the second controller (303-2) or a common controller superior to the first controller (303-1) and the second controller (303-2) is configured to detect the first periodic signal pulses and the second periodic signal pulses with a phase shift.

31. The wheel speed sensor (100) of claim 28 or 29, wherein the wheel speed sensor (100) is connectable to the first controller (303-1) via a first conductor arrangement (107-1) for transmitting the first periodic measurement signal, and wherein the wheel speed sensor (100) is connectable to the second controller (303-2) via a second conductor arrangement (107-2) for transmitting the second periodic measurement signal.

32. The wheel speed sensor (100) of claim 31, wherein the wheel speed sensor (100) includes a first electrical terminal for connecting the first conductor arrangement (107-1) and a second electrical terminal for connecting the second conductor arrangement (107-2).

33. A wheel speed sensor (100) for mounting on an axle, the wheel speed sensor having:

a conductor carrier (101);

wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are arranged at an end side of the conductor carrier (101).

34. The wheel speed sensor (100) of claim 33, wherein the first magnetic sensor element (103-1) comprises a first resistive bridge (201-1) for detecting the first periodic measurement signal, and wherein the second magnetic sensor element (103-2) comprises a second resistive bridge (201-2) for detecting the second periodic measurement signal.

35. The wheel speed sensor of claim 34, wherein the first resistive bridge (201-1) and the second resistive bridge (201-2) are arranged on the conductor carrier (101) in a manner rotated with respect to each other by a defined angle, in order to detect the first periodic measurement signal and the second periodic measurement signal with a defined phase shift with respect to each other.

36. The wheel speed sensor of claim 35, wherein the prescribed angle is 45 °.

37. The wheel speed sensor of claim 35, wherein the prescribed phase shift is a phase shift of 90 °.

38. The wheel speed sensor (100) of any of claims 33 to 37, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) comprise in each case an AMR sensor element, a GMR sensor element or a hall sensor element.

39. The wheel speed sensor (100) of claim 33, wherein the wheel speed sensor (100) comprises a first circuit (105-1) and a second circuit (105-2), wherein the first circuit (105-1) is electrically connected to the first magnetic sensor element (103-1) for measurement value adjustment, and wherein the second circuit (105-2) is electrically connected to the second magnetic sensor element (103-2) for measurement value adjustment.

40. The wheel speed sensor (100) of claim 39, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are configured to detect the respective measurement signals as sinusoidal measurement signals, wherein the first circuit (105-1) and the second circuit (105-2) are configured to convert the respective sinusoidal measurement signals into rectangular signals.

41. The wheel speed sensor (100) of claim 40, wherein the first circuit (105-1) and the second circuit (105-2) are arranged on the conductor carrier (101).

42. The wheel speed sensor (100) of claim 33, wherein the conductor carrier (101) comprises a lead frame, wherein the lead frame is formed of metal.

43. The wheel speed sensor (100) of claim 33, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are configured to detect the periodic measurement signals based on an alternating magnetic field of a magnetic read track, wherein the magnetic read track is formed by an encoder wheel arranged on the axle.

44. The wheel speed sensor (100) of claim 33, wherein the wheel speed sensor (100) is configured to transmit the first periodic measurement signal to a first controller (303-1) of a vehicle and to transmit the second periodic measurement signal to a second controller (303-2) of the vehicle, wherein the first controller (303-1) is configured to determine a first wheel speed based on the first periodic measurement signal, and wherein the second controller (303-2) is configured to determine a second wheel speed based on the second periodic measurement signal.

45. The wheel speed sensor (100) of claim 44, wherein the first periodic measurement signal includes a plurality of first periodic signal pulses, and wherein the second periodic measurement signal includes a plurality of second periodic signal pulses, wherein the first controller (303-1) and the second controller (303-2) or a common controller superior to the first controller (303-1) and the second controller (303-2) is configured to detect the first periodic signal pulses and the second periodic signal pulses, and determine wheel movement based on the first periodic signal pulses and the second periodic signal pulses.

46. The wheel speed sensor (100) of claim 45, wherein the first controller (303-1) and the second controller (303-2) or a common controller superior to the first controller (303-1) and the second controller (303-2) are configured to detect the first periodic signal pulses and the second periodic signal pulses with a phase shift.

47. The wheel speed sensor (100) of claim 44 or 45, wherein the wheel speed sensor (100) is connectable to the first controller (303-1) via a first conductor arrangement (107-1) for transmitting the first periodic measurement signal, and wherein the wheel speed sensor (100) is connectable to the second controller (303-2) via a second conductor arrangement (107-2) for transmitting the second periodic measurement signal.

48. The wheel speed sensor (100) of claim 47, wherein the wheel speed sensor (100) includes a first electrical terminal for connecting the first conductor arrangement (107-1) and a second electrical terminal for connecting the second conductor arrangement (107-2).

49. A wheel speed sensor (100) for mounting on an axle, the wheel speed sensor having:

a conductor carrier (101);

wherein the wheel speed sensor (100) is configured to transmit the first periodic measurement signal to a first controller (303-1) of a vehicle and to transmit the second periodic measurement signal to a second controller (303-2) of the vehicle, wherein the first controller (303-1) is configured to determine a first wheel speed based on the first periodic measurement signal, and wherein the second controller (303-2) is configured to determine a second wheel speed based on the second periodic measurement signal.

50. The wheel speed sensor (100) of claim 49, wherein the first magnetic sensor element (103-1) comprises a first resistive bridge (201-1) for detecting the first periodic measurement signal, and wherein the second magnetic sensor element (103-2) comprises a second resistive bridge (201-2) for detecting the second periodic measurement signal.

51. The wheel speed sensor of claim 50, wherein the first resistive bridge (201-1) and the second resistive bridge (201-2) are arranged on the conductor carrier (101) in a manner rotated by a prescribed angle with respect to each other in order to detect the first periodic measurement signal and the second periodic measurement signal with a prescribed phase shift with respect to each other.

52. The wheel speed sensor of claim 51, wherein the prescribed angle is 45 °.

53. The wheel speed sensor of claim 51, wherein the prescribed phase shift is a phase shift of 90 °.

54. The wheel speed sensor (100) of any of claims 49 to 53, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) comprise in each case an AMR sensor element, a GMR sensor element or a Hall sensor element.

55. The wheel speed sensor (100) of claim 49, wherein the wheel speed sensor (100) comprises a first circuit (105-1) and a second circuit (105-2), wherein the first circuit (105-1) is electrically connected to the first magnetic sensor element (103-1) for measurement value adjustment, and wherein the second circuit (105-2) is electrically connected to the second magnetic sensor element (103-2) for measurement value adjustment.

56. The wheel speed sensor (100) of claim 55, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are configured to detect the respective measurement signals as sinusoidal measurement signals, wherein the first circuit (105-1) and the second circuit (105-2) are configured to convert the respective sinusoidal measurement signals into rectangular signals.

57. The wheel speed sensor (100) of claim 56, wherein the first circuit (105-1) and the second circuit (105-2) are arranged on the conductor carrier (101).

58. The wheel speed sensor (100) of claim 49, wherein the conductor carrier (101) comprises a lead frame, wherein the lead frame is formed of metal.

59. The wheel speed sensor (100) of claim 49, wherein the first magnetic sensor element (103-1) and the second magnetic sensor element (103-2) are configured to detect the periodic measurement signals based on an alternating magnetic field of a magnetic read track, wherein the magnetic read track is formed by an encoder wheel arranged on the axle.

60. The wheel speed sensor (100) of claim 49, wherein the first periodic measurement signal includes a plurality of first periodic signal pulses, and wherein the second periodic measurement signal includes a plurality of second periodic signal pulses, wherein the first controller (303-1) and the second controller (303-2) or a common controller superior to the first controller (303-1) and the second controller (303-2) is configured to detect the first periodic signal pulses and the second periodic signal pulses, and determine wheel movement based on the first periodic signal pulses and the second periodic signal pulses.

61. The wheel speed sensor (100) of claim 60, wherein the first controller (303-1) and the second controller (303-2) or a common controller superior to the first controller (303-1) and the second controller (303-2) are configured to detect the first periodic signal pulses and the second periodic signal pulses with a phase shift.

62. The wheel speed sensor (100) of claim 49 or 60, wherein the wheel speed sensor (100) is connectable to the first controller (303-1) via a first conductor arrangement (107-1) for transmitting the first periodic measurement signal, and wherein the wheel speed sensor (100) is connectable to the second controller (303-2) via a second conductor arrangement (107-2) for transmitting the second periodic measurement signal.

63. The wheel speed sensor (100) of claim 62, wherein the wheel speed sensor (100) includes a first electrical terminal for connecting the first conductor arrangement (107-1) and a second electrical terminal for connecting the second conductor arrangement (107-2).