Wheel speed sensor, wheel speed measuring system, vehicle and method for measuring wheel speed

Abstract

Embodiments of the present application provide a wheel speed sensor (1) comprising a sensor head (11) comprising a first sensor chip (111), a second sensor chip (112) and electrical connection elements, the electrical connection elements comprising a first electrical connection element (1131) and a second electrical connection element (1132), the first electrical connection element is electrically connected with the first pin of the first sensor chip and the first pin of the second sensor chip, and the second electrical connection element is electrically connected with the second pin of the first sensor chip and the second pin of the second sensor chip. The application also comprises a wheel speed measuring system, a vehicle, a method for measuring a wheel speed by means of the wheel speed measuring system, and a computer program product. According to the wheel speed sensor, half of electric connecting elements can be saved, half of the wire harness consumption of the electric connecting elements is saved, and the reliability and accuracy of wheel speed measurement are further improved.

Description

Technical Field

[0001] The present application relates to the field of wheel speed sensors, and in particular to a wheel speed sensor, a wheel speed measurement system, a vehicle including the wheel speed sensor or the wheel speed measurement system, a method for measuring wheel speed by means of the wheel speed measurement system, and a computer program product for at least assisting in implementing the steps of the method according to the present application. Background Art

[0002] As an important parameter for vehicle control, the wheel speed is usually detected by a wheel speed sensor during vehicle operation. This parameter can provide the required wheel speed information for devices, equipment or systems such as an automotive electronic stability program (ESP), an anti-lock braking system (ABS), a control system of an automatic transmission, a power assist system, etc. configured on the vehicle. This is of great significance for ensuring the safe driving of the vehicle and enhancing the handling performance of the vehicle.

[0003] However, due to the limitation of the installation space and the continuous pursuit of the accuracy and reliability of detection, the existing wheel speed sensors still have some defects and deficiencies in terms of, for example, structural configuration, compactness, signal redundancy, etc.

[0004] Therefore, it is necessary to further improve the existing wheel speed sensors. Summary of the Invention

[0005] The purpose of the embodiments of the present application is to provide a wheel speed sensor, a wheel speed measurement system, a vehicle including the wheel speed sensor or the wheel speed measurement system, a method for measuring wheel speed by means of the wheel speed measurement system, and a computer program product to at least solve some problems in the prior art.

[0006] According to the first aspect of the present application, the embodiments of the present application provide a wheel speed sensor. The wheel speed sensor includes a sensor head, and the sensor head includes a first sensor chip, a second sensor chip and an electrical connection element. Among them, the electrical connection element includes a first electrical connection element and a second electrical connection element. The first electrical connection element is electrically connected to the first pin of the first sensor chip and the first pin of the second sensor chip, and the second electrical connection element is electrically connected to the second pin of the first sensor chip and the second pin of the second sensor chip.

[0007] Here, an electrical connection element can be simultaneously connected to one pin of each of two sensor chips. Therefore, compared with the solution where an electrical connection element is only connected to one pin of one sensor chip, the number of electrical connection elements can be saved by half, and half of the wire harness usage of the electrical connection elements can be saved.

[0008] According to an alternative embodiment of the present application, the first sensor chip and the second sensor chip may be the same and configured redundantly relative to each other.

[0009] According to another alternative embodiment of the present application, the first sensor chip and the second sensor chip may be arranged side by side.

[0010] According to another alternative embodiment of the present application, the sensor head may further include a support body, and the first sensor chip and the second sensor chip are fixed to the support body by means of adhesive fixation and / or soldering fixation. Optionally, the support body includes, for example, a bracket and / or a printed circuit board, etc.

[0011] According to another alternative embodiment of the present application, the first electrical connection element and the second electrical connection element may be pre-connected into an integral structure.

[0012] According to another alternative embodiment of the present application, the sensor head may further include an overcurrent protector, and the overcurrent protector includes a first overcurrent protector and a second overcurrent protector. Among them, the first overcurrent protector is configured to prevent a first current exceeding a preset current threshold from flowing through the first sensor chip, and the second overcurrent protector is configured to prevent a second current exceeding a preset current threshold from flowing through the second sensor chip.

[0013] According to a second aspect of the present application, a wheel speed measurement system is provided, and the wheel speed measurement system includes:

[0014] - A wheel speed sensor according to the present application;

[0015] - A magnetic ring adapted to be fixed on a rotatable part of a wheel, and the first sensor chip and the second sensor chip are arranged side by side in the radial direction or the circumferential direction of the magnetic ring and with a defined gap relative to the magnetic ring in the axial direction of the magnetic ring; and

[0016] - A processing unit adapted to obtain wheel speed information based on a first signal collected by the first sensor chip and a second signal collected by the second sensor chip.

[0017] According to another alternative embodiment of the present application, the distance between the first sensor chip and the second sensor chip in the radial direction or the circumferential direction may be configured such that the phase difference between a first signal collected by the first sensor chip and a second signal collected by the second sensor chip is less than a preset phase difference threshold.

[0018] According to another alternative embodiment of the present application, the wheel speed measurement system may further include a steering knuckle cooperatively connected with the magnetic ring, wherein the wheel speed sensor is arranged through the steering knuckle such that the first sensor chip and the second sensor chip are arranged side by side in the radial direction or the circumferential direction of the magnetic ring and with a defined gap relative to the magnetic ring in the axial direction of the magnetic ring.

[0019] According to a third aspect of the present application, there is provided a vehicle, which includes the wheel speed sensor according to the present application or the wheel speed measurement system according to the present application.

[0020] According to a fourth aspect of the present application, there is provided a method for measuring wheel speed by means of the wheel speed measurement system according to the present application, the method including:

[0021] - Step S1: Superimposing the first signal collected by the first sensor chip and the second signal collected by the second sensor chip in time to form a superimposed signal; and

[0022] - Step S2: Obtaining wheel speed information based on the superimposed signal.

[0023] According to another alternative embodiment of the present application, the superimposed signal may include a first superimposed signal having a signal strength between a first signal level and a second signal level and a second superimposed signal having a signal strength between the second signal level and a third signal level, wherein the first signal level is higher than the second signal level, and the second signal level is higher than the third signal level.

[0024] According to another alternative embodiment of the present application, step S2 may include:

[0025] - Step S21: Judging whether the superimposed signal meets a pre-given signal redundancy standard;

[0026] - Step S22: If the superimposed signal meets the pre-given signal redundancy standard, obtaining wheel speed information based on the first superimposed signal or the second superimposed signal;

[0027] - Step S23: If the superimposed signal does not meet the pre-given signal redundancy standard, judging whether there is a superimposed signal meeting the pre-given signal measurement standard in the first superimposed signal and the second superimposed signal;

[0028] - Step S24: If there is a superimposed signal meeting the pre-given signal measurement standard in the first superimposed signal and the second superimposed signal, calculating wheel speed information based on the superimposed signal meeting the pre-given signal measurement standard, and outputting a first notification message regarding signal redundancy failure; and

[0029] - Step S25: If there is no superimposed signal that meets the pre-given signal measurement criteria in the first superimposed signal and the second superimposed signal, then output second notification information regarding the failure of the wheel speed sensor.

[0030] According to another optional embodiment of the present application, the rotational frequency of the magnetic ring can be calculated based on the number of rising edges and falling edges in the first superimposed signal or the second superimposed signal within a defined time period, and the wheel speed can be calculated based on the rotational frequency of the magnetic ring, the number of pole pairs of the magnetic ring, and the wheel circumference.

[0031] According to another optional embodiment of the present application, the pre-given signal measurement criteria can be a comparison of the signal strength of the first superimposed signal or the signal strength of the second superimposed signal with a pre-given level threshold. Wherein, if the signal strength of the first superimposed signal or the signal strength of the second superimposed signal is greater than the pre-given level threshold, then there is a superimposed signal that meets the pre-given signal measurement criteria in the first superimposed signal and the second superimposed signal; if the signal strength of both the first superimposed signal and the second superimposed signal is less than or equal to the pre-given level threshold, then there is no superimposed signal that meets the pre-given signal measurement criteria in the first superimposed signal and the second superimposed signal.

[0032] According to a fifth aspect of the present application, there is provided a computer program product, such as a computer-readable program carrier, containing or storing computer program instructions, which when executed by a processor, at least assist in implementing the steps of the method according to the present application. Description of the Drawings

[0033] Hereinafter, the present application will be described in more detail by referring to the drawings, and the principles, features, and advantages of the present application can be better understood. The drawings include:

[0034] Figure 1 A schematic structural diagram showing a wheel speed measurement system according to an exemplary embodiment of the present application;

[0035] Figure 2 A schematic structural diagram showing a wheel speed measurement system according to another exemplary embodiment of the present application;

[0036] Figure 3 A schematic structural diagram showing a wheel speed measurement system according to another exemplary embodiment of the present application;

[0037] Figure 4 A schematic cross-sectional view showing a wheel speed measurement system according to another exemplary embodiment of the present application along the axial direction of the magnetic ring;

[0038] Figure 5Flowchart of a method for measuring wheel speed by means of a wheel speed measurement system according to an exemplary embodiment of the present application;

[0039] Figure 6 Flowchart of a method for measuring wheel speed by means of a wheel speed measurement system according to another exemplary embodiment of the present application;

[0040] Figure 7 Signal curve diagram varying with time according to an exemplary embodiment of the present application; and

[0041] Figure 8 Signal curve diagram varying with time according to another exemplary embodiment of the present application.

[0042] List of reference numerals

[0043] 1 Wheel speed sensor

[0044] 10 Wheel speed measurement system

[0045] 11 Sensor head

[0046] 111 First sensor chip

[0047] 1111 First pin of the first sensor chip

[0048] 1112 Second pin of the first sensor chip

[0049] 112 Second sensor chip

[0050] 1121 First pin of the second sensor chip

[0051] 1122 Second pin of the second sensor chip

[0052] 1131 First electrical connection element

[0053] 1132 Second electrical connection element

[0054] 114 Support body

[0055] 1151 First overcurrent protector

[0056] 1152 Second overcurrent protector

[0057] 2 Magnetic ring

[0058] 3 Processing unit

[0059] 4 Steering knuckle

[0060] 5 Fender

[0061] 71 First signal

[0062] 72 Second signal

[0063] 73 Superimposed signal

[0064] 731 First superimposed signal

[0065] 732 Second superimposed signal

[0066] 81 First signal

[0067] 82 Second signal

[0068] 83 Superimposed signal

[0069] 831 First superimposed signal

[0070] 832 Second superimposed signal

[0071] I 1 Signal level of the first signal

[0072] I 2 Signal level of the second signal

[0073] I 3 Signal level of the superimposed signal

[0074] I 31 First signal level of the superimposed signal

[0075] I 32 Second signal level of the superimposed signal

[0076] I 33 Third signal level of the superimposed signal

[0077] T Time Detailed implementation manners

[0078] In order to make the technical problems, technical solutions and beneficial technical effects to be solved by the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and multiple exemplary embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the protection scope of the present application.

[0079] It should be understood that in this text, the expressions "first", "second", "third", etc. are only for descriptive purposes, and should not be construed as indicating or implying relative importance, nor should they be construed as implicitly indicating the quantity of the indicated technical features.

[0080] Figure 1 The structural schematic diagram of a wheel speed measurement system according to an exemplary embodiment of the present application is shown. The wheel speed sensor 1 is an important component of the wheel speed measurement system 10, and is particularly used for measuring the wheel speed of a vehicle. As Figure 1As shown, the wheel speed sensor 1 may include a sensor head 11, and the sensor head 11 includes a first sensor chip 111, a second sensor chip 112, and an electrical connection element. Among them, the electrical connection element includes a first electrical connection element 1131 and a second electrical connection element 1132.

[0081] As Figure 1 shown, the first electrical connection element 1131 is electrically connected to the first pin 1111 of the first sensor chip 111 and the first pin 1121 of the second sensor chip 112, and the second electrical connection element 1132 is electrically connected to the second pin 1112 of the first sensor chip 111 and the second pin 1122 of the second sensor chip 112. Here, an electrical connection element can be simultaneously connected to one pin of each of two sensor chips. Therefore, compared with the scheme where only one pin of one sensor chip is connected to one electrical connection element, the number of electrical connection elements can be saved by half, and half of the wire harness usage of the electrical connection elements can be saved.

[0082] Considering the importance of the wheel speed sensor 1 for vehicle control, the first sensor chip 111 and the second sensor chip 112 can be the same and redundantly configured relative to each other, thereby achieving redundancy of the wheel speed measurement signal and improving the reliability of the wheel speed measurement signal.

[0083] The first sensor chip 111 and the second sensor chip 112 are preferably arranged side by side. Optionally, the first electrical connection element 1131 and the second electrical connection element 1132 can be pre-connected into an integral structure. In the sense of this application, "integral" means that the first electrical connection element 1131 and the second electrical connection element 1132 serving as conductive paths are held together, so that not only the relative position between them can be reliably guaranteed, but also the operation in the manufacturing process is facilitated. The first electrical connection element 1131 and the second electrical connection element 1132 can be interconnected by a conductive material or by an insulating material. It can be understood that if they are interconnected by a conductive material, the first electrical connection element 1131 and the second electrical connection element 1132 need to be separated at a certain manufacturing stage to ensure the correct electrical connection relationship in the end. In a preferred embodiment, the integral structure can be formed by stamping and / or bending the same conductive material, such as a metal sheet, so that there are residual connection structures between the first electrical connection element 1131 and the second electrical connection element 1132, and these residual connection structures can be damaged, such as cut off, at a certain manufacturing stage, so as to simply and efficiently manufacture the integral component.

[0084] In Figure 2 and Figure 3In the structural schematic diagram of the wheel speed measurement system according to an exemplary embodiment of the present application, the sensor head 11 may also include an overcurrent protector, which is especially a semiconductor protection fuse. The overcurrent protector includes a first overcurrent protector 1151 and a second overcurrent protector 1152, wherein the first overcurrent protector 1151 is configured to prevent a first current exceeding a preset current threshold from flowing through the first sensor chip 1111, and the second overcurrent protector 1152 is configured to prevent a second current exceeding a preset current threshold from flowing through the second sensor chip 1112. In the event of a short circuit in one of the sensor chips, the overcurrent protector corresponding to the sensor chip will disconnect the electrical connection element connected to the pin of the sensor chip, so that the other sensor chip can still operate normally.

[0085] In addition, the wheel speed sensor 1 may further include a transmission part 12, wherein the transmission part 12 is composed of one or more transmission conductors for transmitting electrical energy and / or electrical signals. Figures 1 to 3 It can be seen that the electrical connection element serves as an intermediate connection element between the sensor chip 111 and the transmission part 12. The signal collected by the sensor chip can be transmitted to the processing unit 3 of the wheel speed measurement system 10 through the electrical connection element and the transmission part 12, and the signal processing is performed in the processing unit 3.

[0086] In addition, the wheel speed measurement system 10 further comprises a magnetic ring 2 which is suitable for being fixed on the rotatable part of the wheel, wherein the magnetic ring 2 is composed of a plurality of N-pole magnetic poles and S-pole magnetic poles which are arranged alternately. Figures 1 to 3 Only four magnetic pole pairs are schematically shown. Figure 1 and Figure 2 In the wheel speed measurement system 10 shown in FIG. 1 , the first sensor chip 111 and the second sensor chip 112 are arranged side by side in the circumferential direction of the magnetic ring 2. Figure 4 FIG. 1 is a schematic cross-sectional view of a wheel speed measurement system 10 according to another exemplary embodiment of the present application along the axial direction of the magnetic ring 2, wherein the first sensor chip 111 and the second sensor chip 112 are shown in FIG. 1 for simplicity. Figure 4 FIG. 2 shows, merely by way of example, a wheel speed sensor 1 which is arranged with a defined gap relative to the magnetic ring 2 in the axial direction of the magnetic ring 2 .

[0087] When the magnetic ring 2 rotates coaxially with the rotatable part of the wheel (such as the wheel hub), the first sensor chip 111 and the second sensor chip 112 arranged side by side can detect the magnetic field change signal of the magnetic ring 2 and convert it into a first electrical signal and a second signal respectively based on, for example, the Hall sensor principle or the magnetoresistive sensor principle. The spacing between the first sensor chip 111 and the second sensor chip 112 in the circumferential direction is configured such that the phase difference between the first signal collected by the first sensor chip 111 and the second signal collected by the second sensor chip 112 is less than a preset phase difference threshold.

[0088] It can be understood that during the rotation of the wheel, the position jitter of each component may be caused, which in turn causes the relative position change between the sensor chip and other components, especially the magnetic ring 2, and the relative position change between the first sensor chip 111 and the second sensor chip 112. Therefore, the phase difference between the first signal collected by the first sensor chip 111 and the second signal collected by the second sensor chip 112 may be dynamically changing, which results in a certain error in the obtained wheel speed signal.

[0089] To reliably ensure the relative position between the wheel speed sensor 1 and the magnetic ring 2 (including in the axial direction, in the radial direction or in the circumferential direction), the wheel speed measurement system 10 may further include a steering knuckle 4 cooperatively connected to the magnetic ring 2. As Figure 4 shown, the wheel speed sensor 1 may be fixed, for example, in a mounting hole of the steering knuckle 4 adapted to the size of the wheel speed sensor 1 and arranged through the steering knuckle 4 such that the first sensor chip 111 and the second sensor chip 112 are arranged side by side in the circumferential direction of the magnetic ring 2 and with a defined gap relative to the magnetic ring 2 in the axial direction of the magnetic ring 2. In addition, a fender 5 may be arranged between the steering knuckle 4 and the magnetic ring 2 in the axial direction of the magnetic ring 2.

[0090] This circumferential arrangement scheme of the sensor chip is relatively simple in the design and production process, but has relatively high requirements for the sensor space size.

[0091] In Figure 3 a radial arrangement scheme of the sensor chip is shown, where the first sensor chip 111 and the second sensor chip 112 are arranged side by side in the radial direction of the magnetic ring 2. Since the magnetoresistive effect material contained in the sensor chip is very sensitive not only to the magnetic field change in the circumferential direction of the magnetic ring but also to the magnetic field change in the radial direction of the magnetic ring, the radial arrangement scheme of the sensor chip does not affect the magnetic sensitivity accuracy of the wheel speed sensor 1.

[0092] AsFigure 3 As shown, the first sensor chip 111 and the second sensor chip 112 can be fixed to the support 114, in particular, by means of adhesive fixation and / or soldering fixation, thereby providing a more reliable relative position guarantee. Exemplarily, the support 114 includes a bracket and / or a printed circuit board, etc. It can be understood that when the manufacturing accuracy is high enough, the radial angular difference between the first sensor chip 111 and the second sensor chip 112 relative to each other can be ignored, and even if this radial angular difference exists, it will remain fixed after the wheel speed sensor 1 is produced and off the production line. Therefore, in the radial arrangement scheme of the sensor chips, the phase difference between the first signal collected by the first sensor chip 111 and the second signal collected by the second sensor chip 112 can also be ignored, and it is no longer affected by the magnetic field uniformity of the magnetic ring 2, nor does it need to consider the phase difference caused by component jitter during the rotation of the wheel. This dynamic change improves the accuracy and reliability of wheel speed calculation. In addition, the radial arrangement scheme of the sensor chips requires a smaller sensor space size, but has a higher cost in the design and production process.

[0093] In the radial arrangement scheme of the sensor chips, the wheel speed sensor 1 can also be fixed in the mounting hole of the steering knuckle 4 that is adapted to the size of the wheel speed sensor 1, and is arranged through the steering knuckle 4 such that the first sensor chip 111 and the second sensor chip 112 are arranged side by side in the radial direction of the magnetic ring 2 and with a defined gap relative to the magnetic ring 2 in the axial direction of the magnetic ring 2.

[0094] The first signal collected by the first sensor chip 111 and the second signal collected by the second sensor chip 112 can be transmitted to the processing unit 3 of the wheel speed measurement system 10 through the electrical connection element and the transmission part 12, and the processing unit 3 obtains the wheel speed information based on the received signals. The processing unit 3 can be a control module separately provided in the wheel speed measurement system 10, or can be integrated in the control modules of systems configured on the vehicle such as an automotive electronic stability program (ESP), an anti-lock braking system (ABS), a control system of an automatic transmission, a power assist system, etc. and provide the required wheel speed information for these systems.

[0095] The following Figure 5 The flowchart of the method for measuring the wheel speed by means of a wheel speed measurement system according to an exemplary embodiment of the present application shown below details the wheel speed obtaining process. The method may include steps S1 and S2. In step S1, the first signal collected by the first sensor chip 111 and the second signal collected by the second sensor chip 112 are time-overlapped into an overlapping signal.

[0096] Figure 7shows an exemplary signal curve varying with time according to the present application. Among them, the first signal 71 collected by the first sensor chip 111 is shown in the upper figure, the second signal 72 collected by the second sensor chip 112 is shown in the middle figure, and the superimposed signal 73 generated by superimposing the first signal 71 and the second signal 72 over time is shown in the lower figure. These signal curves are all exemplarily represented as square waves here. For example, in the radial arrangement scheme of the sensor chips, when there is no relative radial angular difference between the two sensor chips and the dynamic change of the phase difference caused by the jitter during wheel rotation is not considered, the phase difference between the first signal 71 and the second signal 72 is zero. Therefore, the superimposed signal 73 obtained by superimposing the first signal 71 and the second signal 72 is a square wave signal with two signal levels. As Figure 7 shown, the superimposed signal 73 includes a first superimposed signal 731 having a signal intensity between the first signal level I 31 and the second signal level I 32 and a second superimposed signal 732 having a signal intensity between the second signal level I 32 and the third signal level I 33 . Among them, the first signal level I 31 is higher than the second signal level I 32 , and the second signal level I 32 is higher than the third signal level I 33 .

[0097] Figure 8 shows another exemplary signal curve varying with time according to the present application. Among them, the first signal 81 collected by the first sensor chip 111 is shown in the upper figure, the second signal 82 collected by the second sensor chip 112 is shown in the middle figure, and the superimposed signal 83 generated by superimposing the first signal 81 and the second signal 82 over time is shown in the lower figure. For example, in the circumferential arrangement scheme of the sensor chips, there is a phase difference between the first signal 81 and the second signal 82. Therefore, the superimposed signal 83 obtained by superimposing the first signal 81 and the second signal 82 is a square wave signal with three signal levels. As Figure 8 shown, the superimposed signal 83 includes a first superimposed signal 831 having a signal intensity between the first signal level I 31 and the second signal level I 32 and a second superimposed signal 832 having a signal intensity between the second signal level I 32 and the third signal level I 33 . Among them, the first signal level I 31 is higher than the second signal level I 32 , and the second signal level I 32Higher than the third signal level I 33 .

[0098] In step S2, wheel speed information is obtained based on the superimposed signal. Considering that the position jitter of components caused during the rotation of the wheel may lead to a phase difference between the first signal collected by the first sensor chip 111 and the second signal collected by the second sensor chip 112 which changes dynamically, it is necessary not only to evaluate the signal redundancy of the superimposed signal to determine whether the first superimposed signal and the second superimposed signal meet the signal redundancy standard, but also to perform signal measurement standard evaluations on the first superimposed signal and the second superimposed signal respectively, and select the superimposed signal that meets the signal measurement standard for calculating the wheel speed information.

[0099] The following combines Figure 6 the flowchart of the method for measuring wheel speed by means of a wheel speed measurement system according to another exemplary embodiment of the present application shown in detail to elaborate on step S2. The following only elaborates on the differences from the Figure 5 embodiment shown, and the same steps will not be repeated for the sake of brevity.

[0100] As Figure 6 shown, step S2 may include steps S21 to S25. In step S21, it is determined whether the superimposed signal meets a pre-given signal redundancy standard. Here, the deviation between the first superimposed signal and the second superimposed signal can be compared, which includes, for example, phase deviation, amplitude deviation, frequency deviation, etc. If the deviation is within the pre-given deviation range, which means the superimposed signal meets the pre-given signal redundancy standard, then in step S22, wheel speed information is obtained based on the first superimposed signal or the second superimposed signal. As Figure 7 shown, within a sufficiently long time period, the number of rising edges and falling edges in the first superimposed signal 731 is basically equal to the number of rising edges and falling edges in the second superimposed signal 732, so any one of the superimposed signals can be used to obtain the wheel speed information. Here, the number of rising edges and falling edges M in the curve of the selected superimposed signal can be counted within a pre-given time period ΔT, and thus the rotation frequency f of the magnetic ring 2 can be calculated by formula (1) mag :

[0101] f mag = M / ΔT (Formula 1)

[0102] Furthermore, based on the calculated rotation frequency f of the magnetic ring 2 mag , the number of pole pairs Z of the magnetic ring 2, and the wheel circumference C, the driving speed V of the vehicle can be calculated by formula (2):

[0103]

[0104] For another example, in Figure 8 In the signal curve shown, within a sufficiently long time period, the number of rising edges and falling edges in the first superimposed signal 831 is substantially equal to the number of rising edges and falling edges in the second superimposed signal 832. Therefore, either the first superimposed signal 831 or the second superimposed signal 832 can be used to obtain the wheel speed information through formulas (1) and (2).

[0105] If the superimposed signal does not meet the pre-given signal redundancy standard, it is determined in step S23 whether there is a superimposed signal that meets the pre-given signal measurement standard in the first superimposed signal and the second superimposed signal. Here, the pre-given signal measurement standard is the comparison of the signal strength of the first superimposed signal or the signal strength of the second superimposed signal with a pre-given level threshold. If the signal strength of the first superimposed signal or the signal strength of the second superimposed signal is greater than the pre-given level threshold, which means there is a superimposed signal that meets the pre-given signal measurement standard in the first superimposed signal and the second superimposed signal, then in step S24, the wheel speed information is calculated based on the superimposed signal that meets the pre-given signal measurement standard, and the first notification information about signal redundancy failure is output.

[0106] For example, between the first signal level I 31 and the second signal level I 32 no first superimposed signal is detected, while between the second signal level I 32 and the second signal level I 33 a second superimposed signal with a signal strength greater than the pre-given level threshold is detected. Therefore, the second superimposed signal can be used to calculate the wheel speed information, and the first notification information about signal redundancy failure is output. For another example, between the first signal level I 31 and the second signal level I 32 a first superimposed signal with a signal strength greater than the pre-given level threshold is detected, and between the second signal level I 32 and the second signal level I 33 a second superimposed signal with a signal strength greater than the pre-given level threshold is detected. However, the first superimposed signal and the second superimposed signal do not meet the pre-given signal redundancy standard. Therefore, either the first superimposed signal or the second superimposed signal can be used to calculate the wheel speed information, and the first notification information about signal redundancy failure is output.

[0107] If the signal strength of both the first superimposed signal and the second superimposed signal is less than or equal to the pre-given level threshold, for example, between the first signal level I 31 and the third signal level I 33No signal is detected between them, which means that neither the first superimposed signal nor the second superimposed signal meets the pre-given signal measurement standard. Then, in step S25, a second notification message regarding the failure of the wheel speed sensor 1 is output.

[0108] It can be understood that the first notification message and / or the second notification message can be sent to systems configured on the vehicle, such as an Electronic Stability Program (ESP), an Anti-lock Braking System (ABS), a control system of an automatic transmission, an assist system, etc.

[0109] According to the above embodiments of the present application, not only can the interference signals that do not meet the standards in the signals collected by different sensor chips be excluded, but also it can be indicated whether the signals collected by different sensor chips meet the signal redundancy standard, thereby further improving the reliability and accuracy of wheel speed measurement.

[0110] In addition, it should be noted that the step numbers described herein do not necessarily represent the order of sequence, but are merely a kind of reference numeral. According to the specific situation, the order can be changed as long as the technical purpose of the present application can be achieved.

[0111] Although specific embodiments have been described above, these embodiments are not intended to limit the scope of the disclosure of the present application, even in the case where a single embodiment is described only with respect to a specific feature. The feature examples provided in the disclosure of the present application are intended for illustrative purposes only and not for limitation, unless otherwise stated. In specific implementations, multiple features can be combined with each other according to actual needs and when technically feasible. Various substitutions, changes, and modifications can also be conceived without departing from the spirit and scope of the present application.

Claims

1. A wheel speed sensor (1), characterized in that, the wheel speed sensor (1) includes a sensor head (11), the sensor head (11) includes a first sensor chip (111), a second sensor chip (112) and an electrical connection element, wherein, the electrical connection element includes a first electrical connection element (1131) and a second electrical connection element (1132), the first electrical connection element (1131) is electrically connected to the first pin (1111) of the first sensor chip (111) and the first pin (1121) of the second sensor chip (112), and the second electrical connection element (1132) is electrically connected to the second pin (1112) of the first sensor chip (111) and the second pin (1122) of the second sensor chip (112).

2. The wheel speed sensor (1) according to claim 1, characterized in that, the first sensor chip (111) and the second sensor chip (112) are configured identically and redundantly relative to each other.

3. The wheel speed sensor (1) according to claim 1 or 2, characterized in that, the first sensor chip (111) and the second sensor chip (112) are arranged side by side.

4. The wheel speed sensor (1) according to claim 1 or 2, characterized in that, the sensor head (11) further includes a support body (114), and the first sensor chip (111) and the second sensor chip (112) are fixed to the support body (114) by means of adhesive fixation and / or soldering fixation.

5. The wheel speed sensor (1) according to claim 4, characterized in that, the support body (114) includes a bracket and / or a printed circuit board.

6. The wheel speed sensor (1) according to claim 1 or 2, characterized in that, the first electrical connection element (1131) and the second electrical connection element (1132) are pre-connected into an integral structure.

7. The wheel speed sensor (1) according to claim 1 or 2, characterized in that, the sensor head (11) further includes an overcurrent protector, the overcurrent protector includes a first overcurrent protector (1151) and a second overcurrent protector (1152), wherein, the first overcurrent protector (1151) is configured to prevent a first current exceeding a preset current threshold from flowing through the first sensor chip (1111), and the second overcurrent protector (1152) is configured to prevent a second current exceeding a preset current threshold from flowing through the second sensor chip (1112).

8. A wheel speed measurement system (10), characterized in that, the wheel speed measurement system (10) includes: the wheel speed sensor (1) according to any one of claims 1 to 7; A magnetic ring (2) adapted to be fixed to a rotatable part of a wheel, wherein the first sensor chip (111) and the second sensor chip (112) are arranged side by side in the radial direction or the circumferential direction of the magnetic ring (2) and with a defined gap relative to the magnetic ring (2) in the axial direction of the magnetic ring (2); and A processing unit (3) adapted to obtain wheel speed information based on a first signal collected by the first sensor chip (111) and a second signal collected by the second sensor chip (112).

9. The wheel speed measurement system (10) according to claim 8, wherein, The spacing between the first sensor chip (111) and the second sensor chip (112) in the radial direction or the circumferential direction is configured such that the phase difference between the first signal collected by the first sensor chip (111) and the second signal collected by the second sensor chip (112) is less than a preset phase difference threshold.

10. The wheel speed measurement system (10) according to claim 8 or 9, wherein, The wheel speed measurement system (10) further includes a steering knuckle (4) cooperatively connected to the magnetic ring (2), wherein the wheel speed sensor (1) is arranged through the steering knuckle (4) such that the first sensor chip (111) and the second sensor chip (112) are arranged side by side in the radial direction or the circumferential direction of the magnetic ring (2) and with a defined gap relative to the magnetic ring (2) in the axial direction of the magnetic ring (2).

11. A vehicle, the vehicle including the wheel speed sensor (1) according to any one of claims 1 to 7 or the wheel speed measurement system (10) according to any one of claims 8 to 10.

12. A method for measuring wheel speed by means of the wheel speed measurement system (10) according to any one of claims 8 to 10, the method comprising: Step S1: Temporally superimposing a first signal (71, 81) collected by the first sensor chip (111) and a second signal (72, 82) collected by the second sensor chip (112) into a superimposed signal (73, 83); and Step S2: Obtaining wheel speed information based on the superimposed signal (73, 83).

13. The method according to claim 12, wherein, The superimposed signals (73, 83) include a first superimposed signal (731, 831) having a signal strength between a first signal level (I 31 ) and a second signal level (I 32 ) and a second superimposed signal (732, 832) having a signal strength between the second signal level (I 32 ) and a third signal level (I 33 ), wherein the first signal level (I 31 ) is higher than the second signal level (I 32 ), and the second signal level (I 32 ) is higher than the third signal level (I 33 ).

14. The method according to claim 13, wherein, Step S2 includes: Step S21: Judging whether the superimposed signal (73, 83) meets a pre-given signal redundancy criterion; Step S22: If the superimposed signal (73, 83) meets the pre-given signal redundancy criterion, obtaining wheel speed information based on the first superimposed signal (731, 831) or the second superimposed signal (732, 832); Step S23: If the superimposed signal does not meet the pre-given signal redundancy standard, then determine whether there is a superimposed signal that meets the pre-given signal measurement standard in the first superimposed signal (731, 831) and the second superimposed signal (732, 832); Step S24: If there is a superimposed signal that meets the pre-given signal measurement standard in the first superimposed signal (731, 831) and the second superimposed signal (732, 832), then calculate the wheel speed information based on the superimposed signal that meets the pre-given signal measurement standard, and output a first notification message regarding signal redundancy failure; and Step S25: If there is no superimposed signal that meets the pre-given signal measurement standard in the first superimposed signal (731, 831) and the second superimposed signal (732, 832), then output a second notification message regarding the failure of the wheel speed sensor (1).

15. The method according to claim 12 or 13, wherein, calculate the rotation frequency of the magnetic ring (2) based on the number of rising edges and falling edges in the first superimposed signal (731, 831) or the second superimposed signal (732, 832) within a defined time period, and calculate the wheel speed based on the rotation frequency of the magnetic ring (2), the number of pole pairs of the magnetic ring (2), and the wheel circumference.

16. The method according to claim 13, wherein, the pre-given signal measurement standard is the comparison of the signal strength of the first superimposed signal (731, 831) or the signal strength of the second superimposed signal (732, 832) with a pre-given level threshold. Among them, if the signal strength of the first superimposed signal (731, 831) or the signal strength of the second superimposed signal (732, 832) is greater than the pre-given level threshold, then there is a superimposed signal that meets the pre-given signal measurement standard in the first superimposed signal (731, 831) and the second superimposed signal (732, 832). If the signal strength of the first superimposed signal (731, 831) and the signal strength of the second superimposed signal (732, 832) are both less than or equal to the pre-given level threshold, then there is no superimposed signal that meets the pre-given signal measurement standard in the first superimposed signal (731, 831) and the second superimposed signal (732, 832).

17. A computer program product, such as a computer-readable program carrier, comprising or storing computer program instructions, which when executed by a processor at least assist in implementing the steps of the method according to any one of claims 12 to 16.

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