An angle signal redundancy method and device based on an eddy current sensor

Abstract

The application relates to an angle signal redundancy method and equipment based on an eddy current sensor, which comprises the following steps S1: initializing an output signal of the eddy current, S2: collecting four-way eddy current signals and performing differential processing to obtain Sin and Cos signals, S3: continuously monitoring the Sin and Cos signals, if the signal exceeds the range requirement, calculating an output angle and an output speed, and S4: if the signal exceeds the range requirement, using an eddy current redundancy method to calculate the output angle and the output speed; the application has the advantages of improving the stability and robustness of an angle acquisition system.

Description

Technical Field

[0001] This invention belongs to the field of intelligent sensor technology, specifically relating to an angle signal redundancy method and device based on an eddy current sensor. Background Technology

[0002] Eddy current sensors, as non-contact detection devices based on the Faraday principle of electromagnetic induction, induce eddy currents on the surface of a nearby metal conductor through a high-frequency alternating magnetic field generated by their probe coil. This induces changes in the impedance parameters of the probe coil, enabling precise measurement. Their significant advantages lie in their high detection sensitivity to metal objects, millisecond-level rapid dynamic response, excellent long-term operational stability, strong resistance to interference from complex environmental factors such as oil, dust, water mist, and changes in lighting, and their non-invasive nature, which allows detection without direct contact with the object being measured. This makes them indispensable in numerous fields such as industrial automation, condition monitoring, precision displacement measurement, and intelligent transportation systems. Particularly in demanding applications such as vehicle presence detection, high-precision vehicle distance monitoring, real-time speed capture, and metal object classification and recognition, they demonstrate outstanding performance and play an irreplaceable role, becoming one of the core sensing technologies for acquiring reliable sensing data.

[0003] Currently, in practical applications, the Sin / Cos signal output by the eddy current sensor may be distorted or even lost under extreme conditions (such as signal interference, brief over / under voltage in the circuit, etc.). The traditional approach is to consider the angle signal unreliable after detecting that the signal exceeds the limit and terminate the angle signal acquisition. However, when the angle signal of the eddy current sensor is applied to large industrial products, the cessation of angle signal acquisition often causes downtime or even product damage. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide an angle signal redundancy method and device based on an eddy current sensor.

[0005] The technical solution of the present invention is as follows:

[0006] An angle signal redundancy method based on an eddy current sensor includes the following steps:

[0007] S1: Initialize the output signal of the eddy current;

[0008] S2: Acquire four eddy current signals Sin+, Sin-, Cos+, and Cos- and perform differential processing to obtain the Sin and Cos signals;

[0009] S3: Continuously monitor the sin and cos signals. If the signal exceeds the tolerance but meets the range requirements, calculate the output angle θ = Arctan(Sin / Cos) and the output velocity ω = Δθ / Δt, where Δθ is the change in angle and Δt is the change in time.

[0010] S4: If the signal exceeds the tolerance and does not meet the range requirements, the eddy current redundancy method is used to calculate the output angle and output speed.

[0011] Furthermore, the eddy current redundancy method in step S4 includes the following steps:

[0012] S41. Monitor the Sin and Cos signals. If Sin+ / Sin- exceeds Sin_max and Sin_min, the Sin signal is considered abnormal. If Cos+ / Cos-- exceeds Cos_max and Cos_min, the Cos signal is considered abnormal. If only the Sin signal is abnormal, then Sin = Cos + π / 2. If only the Cos signal is abnormal, then Cos = Sin - π / 2.

[0013] S42. If the Sin / Cos signal exceeds Sin_max and Sin_min at a certain moment, then the Sin / Cos signal is considered abnormal during this period, and the output speed is ω = ω_min. -1 Output angle θ = θ -1 +ω*Δt, and simultaneously, the angle fault counter is incremented by 1.

[0014] Furthermore, the eddy current redundancy method also includes:

[0015] S43. If the Sin / Cos signal is still abnormal in the next cycle, the angle fault counter will continue to increment by 1. When the angle fault counter accumulates to the threshold, the eddy current angle sampling will stop and the fault will be reported. If the original angle signal returns to the normal range in the next cycle, the angle fault counter will be reset to zero.

[0016] Furthermore, the range requirement is the interval between Sin_max and Sin_min and between Cos_max and Cos_min, and the Sin_max, Sin_min, Cos_max, and Cos_min signals are obtained by testing in a low-interference and stable signal environment.

[0017] An electronic device is also provided, comprising: a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the steps of the eddy current redundancy method.

[0018] Compared with the prior art, the beneficial effects of the present invention are:

[0019] 1. This invention improves the stability and robustness of the angle acquisition system by calculating the output angle and output speed through the eddy current redundancy method after a brief loss of a single or even all of the sin / Cos signal of the eddy current.

[0020] 2. When a single signal is lost, the present invention outputs the lost signal by acquiring the Sin signal or Cos signal. When all signals are lost, since the use of eddy currents is generally in a high-precision environment with a very short sampling period, the lost signal is obtained by back-calculating the output angle and output speed of the previous cycle, so as to ensure the stability and robustness of the angle acquisition system. Attached Figure Description

[0021] Figure 1 This is a flowchart of the angle signal redundancy method of the present invention. Detailed Implementation

[0022] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figure 1 As shown, an angle signal redundancy method based on an eddy current sensor includes the following:

[0024] S1: Initialize the output signal of the eddy current;

[0025] S2: Acquire four eddy current signals Sin+, Sin-, Cos+, and Cos- and perform differential processing to obtain the Sin and Cos signals;

[0026] S3: Continuously monitor the sin and cos signals. If the signal exceeds the tolerance but meets the range requirements, calculate the output angle θ = Arctan(Sin / Cos) and the output velocity ω = Δθ / Δt, where Δθ is the change in angle and Δt is the change in time.

[0027] S4: If the signal exceeds the tolerance and does not meet the range requirements, the eddy current redundancy method is used to calculate the output angle and output speed.

[0028] S41. Monitor the Sin and Cos signals. If Sin+ / Sin- exceeds the limit, the Sin signal is judged to be abnormal. If Cos+ / Cos- exceeds the limit, the Cos signal is judged to be abnormal. If only the Sin signal is abnormal, then Sin = Cos + π / 2. If only the Cos signal is abnormal, then Cos = Sin - π / 2.

[0029] S42. If the Sin / Cos signals both exceed their limits at a certain moment, then the Sin / Cos signals are considered abnormal during this period, and the output speed is ω = ω -1 Output angle θ = θ -1 +ω*Δt, and at the same time, the angle fault counter is incremented by 1;

[0030] S43. If the Sin / Cos signal is still abnormal in the next cycle, the angle fault counter will continue to increment by 1. When the angle fault counter accumulates to the threshold, the eddy current angle sampling will stop and the fault will be reported. If the original angle signal returns to the normal range in the next cycle, the angle fault counter will be reset to zero.

[0031] The range requirement is the interval between Sin_max and Sin_min and between Cos_max and Cos_min. Exceeding the limit means exceeding Sin_max, Sin_min, Cos_max, and Cos_min. The Sin_max, Sin_min, Cos_max, and Cos_min signals can be tested in a low-interference, stable signal environment or the sensor manufacturer can provide an out-of-limit reference.

[0032] Example 2

[0033] An electronic device includes: a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the steps of the eddy current redundancy method as described in Embodiment 1.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for redundancy of angle signals based on an eddy current sensor, characterized in that: Includes the following steps: S1: Initialize the output signal of the eddy current; S2: Acquire four eddy current signals Sin+, Sin-, Cos+, and Cos- and perform differential processing to obtain the Sin and Cos signals; S3: Continuously monitor the Sin and Cos signals. If the signal deviation is within the acceptable range, calculate the output angle. =Arctan(Sin / Cos), calculate the output velocity. ,in The change in angle. The change over time; S4: If the signal exceeds the tolerance and does not meet the range requirements, the eddy current redundancy method is used to calculate the output angle and output speed. The eddy current redundancy method in step S4 includes the following steps: S41. Monitor the Sin and Cos signals. If Sin+ or Exceeding If the Sin signal is abnormal, then the Cos+ or Cos- signal is considered abnormal. If the Cos signal is abnormal, then the Cos signal is determined to be abnormal. If the Sin signal is abnormal, then Sin = Cos + π / 2; if the Cos signal is abnormal, then Cos = Sin - π / 2. S42. If the Sin signal exceeds a certain value at a certain moment... And the Cos signal exceeds If the Sin / Cos signal is abnormal during this period, the output speed will be [missing value]. Output angle At the same time, the angle fault counter increments by 1.

2. The angle signal redundancy method based on an eddy current sensor according to claim 1, characterized in that: The eddy current redundancy method further includes: S43. If the Sin or Cos signal is still abnormal in the next cycle, the angle fault counter will continue to increment by 1. When the angle fault counter accumulates to the threshold, the eddy current angle sampling will stop and the fault will be reported. If the original angle signal returns to the normal range in the next cycle, the angle fault counter will be reset to zero.

3. The angle signal redundancy method based on an eddy current sensor according to claim 2, characterized in that: The range requirement is the interval between Sin_max and Sin_min and between Cos_max and Cos_min, and the Sin_max, Sin_min, Cos_max, and Cos_min signals are obtained by testing in a low-interference and stable signal environment.

4. An electronic device, characterized in that, include: A processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the steps of the angle signal redundancy method based on an eddy current sensor as described in any one of claims 1-3.

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