CN115184640A

CN115184640A - Multichannel real-time monitoring device of wheel speed sensor

Info

Publication number: CN115184640A
Application number: CN202110360715.8A
Authority: CN
Inventors: 肖奥; 刘金龙
Original assignee: Lubo Automotive Electronics Qufu Co ltd
Current assignee: Lubo Automotive Electronics Qufu Co ltd
Priority date: 2021-04-02
Filing date: 2021-04-02
Publication date: 2022-10-14

Abstract

The invention relates to a wheel speed sensor multi-channel real-time monitoring device, wherein the monitoring device for the wheel speed sensor comprises: the wheel speed sensor includes a simulated ring gear rotating device configured to receive an input electric signal and generate a varying magnetic field for simulating rotation of the ring gear based on the electric signal, and a signal output device configured to output a signal generated by the wheel speed sensor sensing the varying magnetic field. The invention also relates to a wheel speed sensor monitoring system and a monitoring method for the wheel speed sensor.

Description

Multichannel real-time monitoring device of wheel speed sensor

Technical Field

The present invention relates to the field of wheel speed sensors. More particularly, the present invention relates to detection of a wheel speed sensor.

Background

Nowadays, vehicles become a necessary tool for people to go out, and safety is an important index for users to evaluate vehicle performance. With the increasing demand for vehicle safety, a series of vehicle safety control systems, such as an anti-lock braking system (ABS), a driving wheel anti-skid system (ASR), a vehicle dynamic control system (VDC), an Electronic Stability Program (ESP), have appeared to effectively improve the safety performance of a vehicle when the vehicle is traveling. In these systems, wheel speed (wheel speed) information of the wheels is essentially used. Particularly, the current running state of the vehicle can be known through the wheel speed data, and under the condition that certain danger exists in the current running state, a driver is reminded to pay attention to control the vehicle speed, or a vehicle safety control system runs a corresponding safety auxiliary function based on the current running state of the vehicle, so that the life safety of people in the vehicle is guaranteed.

A wheel speed sensor, which is one of the most critical sensors in modern automobiles, mainly collects wheel speed information and provides an output signal regarding the wheel speed information to various vehicle safety control systems, which operate based on the wheel speed information provided by the wheel speed sensor to implement a safety assistance function. Therefore, the performance of the wheel speed sensor for acquiring wheel speed information, particularly the accuracy of the acquired wheel speed information, is of great significance for improving the controllability of driving, improving the reliability of a safety control system, ensuring the driving safety and reducing the occurrence of traffic accidents. Therefore, the signal output of the wheel speed sensor needs to be accurately monitored in the design experiment stage so as to accurately evaluate the performance of the wheel speed sensor and ensure the quality of the produced wheel speed sensor.

Unless otherwise indicated, it should not be assumed that any of the methods or apparatus described in this section qualify as prior art merely by virtue of their inclusion in this section. Likewise, the problems identified with respect to one or more of the methods and apparatus should not be assumed to be recognized in any prior art based on this section unless otherwise indicated.

Disclosure of Invention

The invention provides an improved detection/monitoring scheme of a wheel speed sensor, so as to realize accurate detection and evaluation of the performance of the wheel speed sensor.

According to an aspect of the present invention, there is provided a monitoring apparatus of a wheel speed sensor, which includes a simulated ring gear rotation device configured to receive an input electric signal and generate a varying magnetic field for simulating ring gear rotation based on the electric signal, and a signal output device configured to output a signal generated by the wheel speed sensor sensing the varying magnetic field for monitoring.

According to another aspect of the present invention, there is provided a wheel speed sensor monitoring system, comprising the wheel speed sensor monitoring device described above, a wheel speed sensor, and a fixture, wherein the fixture is configured to hold the wheel speed sensor stationary relative to a simulated ring gear rotating device in the monitoring device.

The detection device of the invention also has other advantageous technical features which can be applied individually or in any combination in a technically possible way.

Other features and advantages of the apparatus and methods of the present invention will be apparent from, or are more particularly, described in the accompanying drawings, which are incorporated herein, and the following detailed description of the embodiments, which together serve to explain certain principles of the present invention.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

fig. 1A is a schematic block diagram of a monitoring apparatus of a wheel speed sensor according to an embodiment of the present invention;

FIG. 1B is a flow chart of a method of monitoring a wheel speed sensor according to an embodiment of the present invention;

FIG. 2 is a pulse circuit controller circuit diagram according to an embodiment of the present invention;

fig. 3A to 3C are schematic views of a tool according to an embodiment of the present invention.

Detailed Description

A test method of a wheel speed sensor according to the present invention will be described below by way of embodiments with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention to those skilled in the art. It will be apparent, however, to one skilled in the art, that the present invention may be practiced without some of these specific details. Rather, it is contemplated that the invention may be practiced with any combination of the following features and elements, whether or not they relate to different embodiments. Thus, the following aspects, features, embodiments and advantages are merely illustrative and should not be considered elements or limitations of the claims except where explicitly recited in a claim(s).

Moreover, in order to avoid obscuring the present invention with unnecessary detail, only process steps and/or device structures germane to at least the solution according to the present invention are shown in the drawings, while other details not germane to the present invention are omitted. It should also be noted that like reference numbers and letters in the figures indicate like items and, thus, once an item is defined in a figure, it need not be discussed again with respect to subsequent figures.

In wheel speed sensor design experiments, it is often required to observe signal output in real time during the experiments. At present, a gear ring is driven to rotate by a pneumatic motor or a mechanical motor, for example, the motor or the motor is used for driving the gear ring to rotate and operate under various working conditions, and a wheel speed sensor correspondingly collects and outputs a wheel speed signal for observation, so that the performance of the wheel speed sensor is detected. Specifically, in the experimental process, a motor-driven wheel hub device is prepared, a sensor is mounted at a corresponding position of a wheel hub, a motor is driven, the rotating speed is controlled, the actual working condition is simulated, the generated pulse waveform is observed by an oscilloscope, the pulse frequency is analyzed, under the normal condition, the faster the rotating speed is, the larger the pulse frequency is, the conversion between the wheel speed and the frequency can be carried out, and the quality and the accuracy of the wheel speed sensor can be verified reversely. The voltage signal generated by the wheel speed sensor sensing the rotating gear is detected through an oscilloscope or a counter, so that the quality of the sensor is judged.

However, the current experimental scenario has the following drawbacks:

on one hand, experimental scenes are various and damage to equipment can be caused. In particular, a plurality of types of tests, such as tests which are performed by simulating various vehicle driving scenes, may be required, and the test box has a high temperature or a low temperature, so that in the tests, the pneumatic motor or the mechanical motor is required to be stored in the test box, and the motor is easily damaged.

On the other hand, it is difficult to achieve or keep the experimental scenario stable or accurate. Particularly, in experiments, accurate and proper equipment installation and regulation and control are often required, for example, a wheel speed sensor is accurately installed, a gear ring is required to be connected and the rotating speed of the gear ring is required to be accurately regulated when a pneumatic motor or a mechanical motor is used, and the like. Thus, some errors in the installation or as the experiment progresses can cause inaccurate sensor outputs and result in inaccurate estimates.

In addition, need connect the ring gear when using air motor or mechanical motor, but when the experimental sample quantity was too much, the sensor was connected the difficulty with the ring gear, was unfavorable for the effective control to a plurality of experimental samples. This problem is particularly evident, for example, when multiple wheel speed sensors need to be monitored experimentally at the same time.

The present invention is directed to solve at least one of the above problems, and to solve the problem of the correctness of real-time monitoring signal output in the experiment of a wheel speed sensor.

More specifically, the invention provides a method for simulating the condition of the gear ring during rotation by adopting a specific circuit control device, and an actual motor or motor connection is not needed to be adopted to drive the gear ring to rotate, so that the adverse effect of the arrangement of the motor or the motor driving the gear ring on the monitoring precision can be effectively avoided. In particular, even if experiments under various scenes and conditions exist, such as high-temperature or low-temperature environments, the motor or the motor is not used, so that the damage to the motor or the motor is avoided, and the expense of experimental equipment is reduced.

According to an embodiment, the present invention provides a monitoring apparatus of a wheel speed sensor, including a simulated ring gear rotation device configured to receive an input electric signal and generate a varying magnetic field for simulating ring gear rotation based on the electric signal, and a signal output device configured to output a signal generated by the wheel speed sensor sensing the varying magnetic field.

Thus, the present invention employs a simulated ring gear rotating apparatus to generate a varying magnetic field to simulate the condition of ring gear rotation without using a motor or a mechanical motor to connect the ring gear as in the conventional experimental scenario, which enables stable and precise control, such as simulation of an accurate ring gear rotation speed, by circuit control during the design experiment, which enables the wheel speed sensor to provide a stable and accurate output for detection or monitoring during the design experiment.

In particular, the variable magnetic field generated in the present invention can simulate the rotation condition of the gear ring under various test scenarios, for example, the corresponding variable magnetic field can be generated based on experimental data or historical data about at least one of various test scenarios, vehicle operating environment, wheel rotation degree, etc., so that the rotation of the gear ring under various scenarios can be accurately simulated through the circuit, and in particular, control can be performed to obtain the effect like precisely adjusting the rotation speed of the gear ring, so that the actual vehicle wheel rotation speed can be better simulated for analysis and test. For example, a varying magnetic field corresponding to the wheel rotational speed (i.e., the wheel rotational frequency) may be generated (such as the frequency of the varying magnetic field coinciding with the wheel rotational frequency), and for example, the frequency of the varying magnetic field may be appropriately corrected in consideration of the vehicle running environment and the like, and the like.

According to an embodiment of the present invention, the simulated ring gear rotating means may generate a varying magnetic field based on the pulse signal to simulate ring gear rotation. Here, the electrical signal input to the analog ring gear rotating apparatus may be directly a pulse signal itself, such as an adjustable pulse signal input by another device, or may be a voltage or current signal from a power supply, such as a voltage signal from a dc power supply, which is processed to generate the pulse signal. Conventionally, in a test, a vehicle is fitted with a ring gear near the wheel, which is brought to rotate together when the wheel rotates, usually at the same rotational speed/frequency. And the gear ring is induced by a magnet in the active sensor to generate a variable magnetic field consistent with the rotation frequency of the wheel. In the present invention, the pulse signal may be a signal corresponding to a wheel rotation frequency, as an example, so that a varying magnetic field having the frequency can be generated therefrom.

The simulated ring gear rotation means may be implemented in various ways. According to an embodiment of the present invention, a simulated ring gear rotating apparatus according to an embodiment of the present invention may include: a pulse generator that receives the electrical signal and generates a pulse signal based on the electrical signal, and a magnetic field generating device that receives the pulse signal and generates the varying magnetic field based on the pulse signal.

The pulse generator may be implemented in various suitable ways according to the invention. As one example, the pulse generator may generate a square wave signal as a pulse signal based on the input voltage signal, and as another example, the pulse generator may generate a continuous signal, such as a sine or cosine signal or the like, based on the input voltage signal, and further perform a filtering process or the like on the continuous signal to generate the square wave signal as the pulse signal. According to embodiments of the present invention, the pulse generator may generate various forms of pulse signals to simulate rotation of the ring gear. In particular, the pulse generator may generate a square wave varying voltage.

According to an embodiment of the present invention, the magnetic field generating device may be a passive sensor capable of generating a varying magnetic field to simulate rotation of the ring gear in response to the pulse generated by the pulse generator. The passive sensor may take the form of various tactile sensors known in the art, such as sensors made using resistive, inductive, capacitive and strain effects, magnetoresistive effects, thermal resistance effects, and the like. A magnetically passive sensor that can generate a varying magnetic field to simulate the output of an actual ring gear can be used in the present invention.

Like this, through adopting the circular telegram passive sensor that more can resist high temperature/microthermal to replace pneumatic motor or mechanical motor, this scheme has better use flexibility and suitability, need not the air pump and connects, can extensively be suitable for various scenes for can both provide stable experiment scene in various test scenes, can provide speed of a motor output signal steadily and detect with supplying the fast sensor of wheel.

According to an embodiment of the present invention, the passive sensor is fixed on the tool and opposite to the wheel speed sensor, so that the passive sensor can stably provide the generated changing magnetic field, and thus the wheel speed sensor can stably and accurately sense the changing magnetic field. The interval between the passive sensor and the wheel speed sensor may be set appropriately, for example, according to experimental requirements, with reference to a wheel speed sensor detection standard, with reference to previous experimental data, and the like. In particular, the device for fixing the passive sensor may be included in the monitoring device, even in the simulated ring gear rotating device, or may be located outside the monitoring device, for example, may be used to fix both the passive sensor and the wheel speed sensor to be monitored relative to each other.

The signal output device may include various implementations according to the present invention. As one example, the signal output device may comprise a device that provides signals generated by the wheel speed sensor to other suitable processing devices and display devices for evaluation, monitoring, such as an I/O circuit interface, and the like. As another example, the signal output device may comprise a device, such as a display, oscilloscope, or the like, capable of processing and/or presenting the signal generated by the wheel speed sensor for evaluation, monitoring, or the like. For example, the signal may be subject to processing, such as filtering, noise reduction, etc., before being rendered, and such processing operations may be performed within or outside of the signal output device.

Fig. 1A shows a schematic block diagram of a monitoring device for a wheel speed sensor according to an exemplary embodiment of the present invention. The power supply supplies power to the simulated gear ring rotating device, particularly supplies power to a pulse generator in the simulated gear ring rotating device, the pulse generator generates and provides a pulse signal to a variable magnetic field generator, the variable magnetic field generator generates a magnetic field, and the wheel speed sensor senses the magnetic field and provides the generated signal to the signal output device. It should be noted that the various connections between the devices shown in the figures are exemplary only, and may be direct connections, indirect connections where intermediate processing units are present, or even wireless connections.

It should be noted that the components shown in the figures are only logic modules divided according to the specific functions implemented by the logic modules, and are not used for limiting the specific implementation manner, and can be implemented in software, hardware or a combination of software and hardware. In actual implementation, the above modules may be implemented as separate physical entities, or may be implemented by a single module (e.g., a processor (CPU or DSP, etc.), an integrated circuit, etc.).

Further, although not shown, other necessary units/devices may be included in the apparatus. For example a power supply that needs to supply power to other components in other devices, or an intermediate processing device that detects signals, or such as a memory or the like. For example, the monitoring device may be directly or indirectly (e.g., with other components possibly connected in between) connected to the memory for accessing data. The memory may store various information acquired and generated by the wheel speed sensor, programs and data for monitoring the operation of the apparatus, and the like. The memory may be volatile memory and/or non-volatile memory. For example, memory may include, but is not limited to, random Access Memory (RAM), dynamic Random Access Memory (DRAM), static Random Access Memory (SRAM), read Only Memory (ROM), flash memory.

An exemplary basic operational flow according to an embodiment of the present invention will be described below with reference to FIG. 1B as follows:

first, in step 101, a dc voltage input is received. In particular, a direct current power supply is used as a power supply, for example, the direct current power supply is connected to a power socket, and the direct current voltage is output by 3.3-30V to supply power for the monitoring device. The dc power supply output is connected to a pulse generator (e.g., a pulse circuit controller) that supplies the pulse generator circuit with an appropriate dc voltage. The output of the power supply can be connected to the pulse generator circuit in a suitable manner, for example, as positive or negative polarity requirements.

Then, at step 102, the pulse circuit controller converts the input direct current voltage into a square wave varying voltage and provides the generated square wave varying voltage to a varying magnetic field generator (e.g., a passive sensor). Here, the output of the pulse circuit controller is connected to both ends of the passive sensor harness, thereby applying a square wave varying voltage to the passive sensor harness.

In step 103, the passive sensor receives the square wave varying voltage and generates a varying magnetic field based on the square wave varying voltage. Here, the passive sensor may be fixed on a tool so that the generated varying magnetic field can be stably applied to the wheel speed sensor to be monitored.

The sensor then senses the changing magnetic field generated by the passive sensor to generate a signal related to wheel speed information, and sends the signal to a signal output device to perform signal monitoring, as in step 104. In particular, according to the present invention, the monitoring may be performed in real time or in batch at specific intervals, for example, information within a specific time period is collected and uniformly presented for monitoring.

According to the present invention, the frequency and duty ratio of the pulse signal generated by the pulse generator, such as a square wave voltage signal, can be precisely controlled and adjusted, thereby precisely simulating the operating conditions corresponding to various ring gear rotation speeds.

According to an embodiment of the present invention, the pulse generator may include a resistor and a capacitor, and be configured to set the frequency of the square wave voltage based on a capacitance value of the capacitor and a resistance value of the resistor, and set the duty ratio of the square wave voltage signal based on the resistance value. In particular, according to the invention, the resistance and the capacitor of the pulse control circuit are adjustable for adjusting the duty cycle and the frequency of the output square wave voltage signal.

According to embodiments of the present invention, the pulse generator may take various forms, for example, the pulse generator may be implemented based on various suitable integrated circuits, as long as it is capable of generating the desired pulse signal for simulating the rotation of the ring gear. As an example, the pulse generator may be implemented using a time-based integrated circuit, but may also be implemented using other suitable types of circuits.

A pulse generator based on a time-based integrated circuit, which may be any of a variety of time-based integrated circuits, will be described below with reference to fig. 2, here illustrated using NE555 as an example.

The NE555 time base integrated circuit has 8 pins. The pin 1 is used for an external power negative terminal VSS or ground, and is shown as ground in the figure. Pin 2 corresponds to the low trigger terminal TR, where a capacitor C2 is switched in. Pin 3 corresponds to the output of the pulse circuit, outputting U1 (Q). Pin 4 is the direct clear terminal. When this terminal is low, the time base circuit is not operated, at which time the output of the time base circuit is "0" regardless of the level of TR, TH, and when this terminal is not used, it should be high, shown connected to the input of the power supply VCC. Pin 5 indicates the control voltage terminal CV. If the end is externally connected with voltage, the reference voltage of the two comparators in the end can be changed, and when the end is not used, the end can be connected into a capacitor in series to be grounded so as to prevent interference from being introduced. Pin 5 is shown with a capacitor C1 connected. And a pin 6: high trigger end TH. And a pin 7: and a DC terminal capable of receiving a static voltage input generated by dividing the voltage through the resistors R1 and R2. Pin 8: and an external power VCC. A diode D1 is provided between

pins

6 and 7 to protect the circuit.

In the implementation of the invention, through the circuit arrangement, the direct current voltage is input to 3.3-30V, and the square wave with the amplitude of 3.3-30V is output and generated;

frequency of square wave signal: f = 1.43/(R1 + R2) C2

Duty ratio of the square wave signal: duty = R1/(R1 + R2)

The resistors and capacitors may be implemented in various suitable ways, among others. As one example, respective resistor and capacitor configurations may be set for various scenarios. Wherein the resistor and capacitor may have fixed sizes such that for each scenario a corresponding pulse control circuit may be provided. As another example, the resistors and capacitors may be variable, which can provide a general purpose type of pulse control circuit that can generate an appropriate square wave voltage signal by adjusting the values of the resistors and capacitors to simulate the ring gear speed in various scenarios.

Therefore, the square wave pulse signals with various frequencies and duty ratios can be accurately realized through reasonably setting/adjusting the values of the capacitor and the resistor in the circuit, so that the rotation of the gear ring can be simulated through accurate circuit control, and a variable magnetic field is generated to be detected by the wheel speed sensor. And the wheel speed sensor generates an output signal corresponding thereto for monitoring, for example, whether the wheel speed indicated by the output signal is consistent with the simulated rotation speed of the ring gear, whether the error meets the performance requirement, etc., thereby determining and analyzing the performance of the wheel speed sensor.

For example, conventionally, a vehicle is provided with a ring gear near a wheel, when the wheel rotates, the ring gear is induced by a magnet inside an active sensor to generate a changing magnetic field consistent with the wheel rotation frequency, a chip inside the sensor works in the changing magnetic field to output working current, for example, 48 teeth of the ring gear, when the wheel rotates for one circle, the sensor outputs 48 pulses, and the vehicle speed is calculated according to the pulse frequency, which is the working principle of the active sensor. In the invention, the pulse circuit is used for converting direct-current voltage into square-wave variable voltage, and simultaneously comprises a resistor and a capacitor element, the frequency output by the circuit is adjusted according to the size relationship of the resistor and the capacitor element (for example, f = 1.43/(R1 + R2) C2), the pulse circuit is connected to the passive sensor, the passive sensor is internally formed by a coil, when the coil receives a pulse with a certain frequency, a variable magnetic field with the frequency is correspondingly generated, and then the pulse circuit and the passive sensor are used for generating the variable magnetic field to simulate the working condition corresponding to the rotation of the gear ring.

Here, various ring gear rotation speed rotation conditions can be accurately simulated through appropriate setting of circuit parameters and accurate circuit control, that is, variable magnetic fields corresponding to various ring gear rotation speeds are realized, for example, different frequencies of an actual vehicle can be accurately simulated, just like adjusting the ring gear rotation speed. Therefore, the rotating speed of the real vehicle can be better simulated to carry out analysis and test so as to be used for monitoring the performance of the wheel speed sensor. And the gear ring is effectively avoided, and the error and the power consumption caused by various speed change adjustments of the motor or the motor on the gear ring are reduced.

In addition, the scheme of the invention has better flexibility and applicability, and particularly, for various types of experiments, the simulation gear ring rotating device can be adaptively arranged to adapt to the experiments, so that the simulation gear ring rotating device can be flexibly suitable for various experimental scenes, and the experimental result cannot be influenced due to the difficult connection of the gear ring and the sensor.

In the existing experimental scene, some sensors can only detect a single signal type sensor and cannot be well expanded, and the requirement of rapid development of detection industry cannot be met. Therefore, a system which has moderate cost, is suitable for multi-channel detection of sensors with various signal types and has high efficiency for testing the wheel speed sensor of the automobile is particularly necessary.

According to the embodiment of the invention, the multichannel monitoring arrangement of the wheel speed sensor is also provided, so that the signals of the wheel speed sensors of various types can be analyzed and measured, and the performance of the sensor can be judged according to the analysis and measurement.

Particularly, the multi-channel tool is arranged, and the monitoring device is arranged on each channel to simulate the corresponding experiment scene, particularly, each channel can be respectively used for detecting/monitoring the wheel speed sensor under different experiment scenes, so that the multi-channel wheel speed sensor can be conveniently and efficiently monitored, particularly the wheel speed sensors in different experiment scenes can be conveniently monitored, and the detection/monitoring efficiency of the wheel speed sensors can be obviously improved.

According to the embodiment of the invention, a simulated gear ring rotating device can be arranged on each channel in the multi-channel tool to simulate the corresponding experimental scene of each channel, and the output of each channel is connected to a common output device for monitoring the signal generated by the wheel speed sensor.

Fig. 3A to 3C are schematic diagrams illustrating a tool for constructing multi-channel monitoring of a wheel speed sensor according to the present invention. Wherein on each channel a wheel speed sensor is arranged opposite to a monitoring device according to the invention, in particular a varying magnetic field generator (such as a passive sensor) in the monitoring device, for example.

Wherein 1 denotes a wheel speed sensor which is fixed on a tool, and a sensor tail end can be connected to a signal output device such as an oscilloscope. 3 may indicate a varying magnetic field generator (such as a passive sensor): the pulse circuit controller is connected to generate an adjustable variable magnetic field; of course, 3 may also indicate the monitoring device itself. It should be noted that the positions of 1 and 3 in the figures are exemplary only, and their positions may be interchanged or otherwise arranged as long as the appropriate spacing interfaces are maintained with respect to each other.

And 2, a tool for fixing both the wheel speed sensor and the varying magnetic field generator.

Fig. 3A shows a cross-sectional view of a tool in a multi-channel monitoring system, wherein a wheel speed sensor is fixed on one side and corresponds to a passive coil fixed on the other side and induces a changing magnetic field generated by the passive coil.

FIG. 3B shows a front view of a tool in a multi-channel monitoring system. It can be seen that a plurality of wheel speed sensors can be installed in one tooling assembly line, so that the wheel speed sensors can be monitored in parallel, and the monitoring efficiency of the wheel speed sensors is effectively improved.

FIG. 3C shows a top view of a tool in a multi-channel monitoring system. It can be seen that there are multiple channels in a tooling system with multiple channels in parallel, and each channel contains a wheel speed sensor and a passive coil arranged opposite to each other.

It should be noted that fig. 3A to 3C are merely schematic and do not show some other components required in the test, such as power supplies, output devices, etc.

According to the invention, the tooling can be implemented in various suitable ways. As an example, the tool may include a base, a pillar may be installed in the base, a bracket may be installed on the pillar or the base, and a sensor fixing plate may be installed on the bracket. Of course, the tool may also adopt other suitable structures as long as the wheel speed sensor and the monitoring device of the invention, especially the passive sensor in the monitoring device of the invention, can be accurately and properly positioned.

Therefore, the method is suitable for the condition that a plurality of wheel speed sensors need to be tested and monitored simultaneously, wherein a plurality of channels are manufactured through a tool, the multi-channel monitoring of the plurality of wheel speed sensors is realized through accurate circuit control, a motor/motor and a gear ring are not needed, the defect that the sensors are difficult to connect with the gear ring when the number of experimental samples is excessive in the prior art is overcome, and the multi-channel monitoring can be conveniently, efficiently and accurately carried out. The system has the advantages of simple structure, low cost, high precision, more sensors for single test and high efficiency, and is particularly suitable for high-temperature and low-temperature complex environment tests.

It should be noted that the above description is only exemplary, and that the invention may also comprise other embodiments, such as alone or in combination with the above-described embodiments of the invention.

For example, in consideration of practical factors such as the working environment and the size of the space of the wheel, commonly used wheel speed sensors mainly include: a magnetoelectric wheel speed sensor and a Hall wheel speed sensor. The technical idea of the present invention can be effectively applied to the above two kinds of wheel speed sensors, and can be equally applied to other similar wheel speed sensors as long as the change field for the wheel speed sensor to detect is simulated by appropriately arranging the simulated ring gear rotating means.

It should be noted that the structures and concepts described above for these embodiments of the monitoring device are equally applicable to the detection of sensors in other types and application scenarios, so as to enable accurate and cost-effective detection of these sensors. For example, many subsystems in a railroad locomotive (e.g., the locomotive or units) rely on a reliable and accurate speed signal, which in some cases is an indicator of speed or speed variation. This applies in particular to traction control, but also to wheel slide protection, alignment, train control, door control, etc. These tasks are performed by a number of speed sensors found in various parts of the vehicle. Thus, the concepts of the present invention may be equally applied to tacho sensors used in railway systems, and may be equally applied to tacho sensors in other systems.

Although the present general inventive concept has been described in conjunction with the embodiments, it will be understood by those skilled in the art that various changes and modifications may be made to the embodiments without departing from the principles and spirit of the general inventive concept.

Claims

1. A monitoring device for a wheel speed sensor, comprising:

a simulated ring gear rotating device configured to receive an input electrical signal and generate a varying magnetic field for simulating ring gear rotation based on the electrical signal, an

A signal output device configured to output a signal generated by the wheel speed sensor sensing the varying magnetic field.

2. The monitoring device of claim 1, wherein the simulated ring gear rotating means comprises:

a pulse generator that receives the electrical signal and generates a pulse signal based on the electrical signal, wherein the frequency of the pulse signal corresponds to the frequency of the simulated ring gear rotation, an

A magnetic field generating device that receives the pulse signal and generates the changing magnetic field based on the pulse signal.

3. The monitoring device of claim 2, wherein the electrical signal is a direct current voltage signal and the pulse signal is a square wave voltage signal derived based on the direct current voltage signal.

4. The monitoring device of claim 3, wherein the pulse generator comprises a resistor and a capacitor, and wherein the pulse generator is configured to set the frequency of the square wave voltage signal based on a capacitance value of the capacitor and a resistance value of the resistor, and to set the duty cycle of the square wave voltage signal based on the resistance value.

5. The monitoring device of claim 2, wherein at least the magnetic field generating device is fixed on the tool opposite the wheel speed sensor.

6. The monitoring device of claim 5, wherein the monitoring device comprises a plurality of simulated ring gear rotating devices, each of which is arranged via a tooling corresponding to and generating a varying magnetic field for an associated wheel speed sensor to be monitored, respectively.

7. A wheel speed sensor monitoring system comprising:

at least one monitoring device for a wheel speed sensor according to any of claims 1-5;

at least one wheel speed sensor, and

a tooling having at least one channel, wherein,

each tooling channel corresponds to a monitoring device and a wheel speed sensor and is used for enabling the wheel speed sensor and a simulated gear ring rotating device in the monitoring device to be kept fixed relatively.

8. A monitoring method for a wheel speed sensor, comprising the steps of:

receiving a direct current voltage;

generating, by a pulse generator, a pulse voltage signal based on the direct current voltage;

receiving the pulsed voltage signal by a varying magnetic field generator to generate a varying magnetic field for application to the wheel speed sensor; and is

And outputting a signal generated by the wheel speed sensor sensing the changing magnetic field.

9. The monitoring method of claim 8, further comprising:

the frequency of the pulse voltage signal is set based on the capacitance value of a capacitor included in the pulse generator and the resistance value of a resistor, and the duty ratio of the pulse voltage signal is set based on the resistance value.