Control Method and Device for Reliability of Inductive Angle Sensor within Full Temperature Range

Abstract

The present invention relates to the technical fields such as intelligent sensor systems, and provides a control method and device for the reliability of an inductive angle sensor within the full temperature range. After collecting the SIN position signal and the COS position signal, filtering and preliminary amplification are performed, and the amplified SIN position signal and the amplified COS position signal are used for real-time detection of the signal strength. It is judged whether the signal strength error is within a preset error range, and the preset error range includes a small error range and a large error range. When the signal strength error is within the small error range, the gain control unit in the signal acquisition circuit is adjusted to compensate for the small change in the signal strength. When the signal strength error is within the large error range, the square wave frequency of the excitation signal in the excitation signal adjustment circuit in the inductive angle sensor system is adjusted to compensate for the large change in the signal strength, thereby improving the reliability and accuracy of the inductive angle sensor within the full temperature range.

Description

Technical Field

[0001] The present invention relates to the technical fields of transmission of digital information, intelligent sensor systems, etc., and particularly relates to a method and device for controlling the reliability of an inductive angle sensor within a full temperature range. Background Art

[0002] Currently, in an inductive angle sensor system, an LC resonant circuit generates an excitation signal, and the excitation signal is mutually inductively coupled through a PCB planar coil to generate an angular position signal. Within a full temperature range of -55° to 85°, a total of 140°, the capacitance in the LC resonant circuit and the resistance of the PCB coil will change greatly. Eventually, when accumulated and superimposed, the mutually inductive coupling signal can have a signal strength change of 4 - 5 times, reducing the reliability of the inductive angle sensor within the full temperature range and reducing the accuracy of the inductive angle sensor.

[0003] In summary, the existing inductive angle sensors have technical problems such as reduced reliability and reduced accuracy within the full temperature range. Summary of the Invention

[0004] Aiming at the deficiencies of the above-mentioned existing technologies, the present invention provides a method and device for controlling the reliability of an inductive angle sensor within a full temperature range to improve the reliability and accuracy of the inductive angle sensor within the full temperature range.

[0005] In a first aspect, the method for controlling the reliability of an inductive angle sensor provided by the present invention within a full temperature range includes:

[0006] Collecting a SIN position signal and a COS position signal from the inductive angle sensor through a signal acquisition circuit in the inductive angle sensor system, and filtering and preliminarily amplifying the SIN position signal and the COS position signal to obtain an amplified SIN position signal and an amplified COS position signal;

[0007] Performing real-time detection of the signal strengths of the amplified SIN position signal and the amplified COS position signal, and determining whether the signal strength error between the signal strength of the amplified SIN position signal and the signal strength of the amplified COS position signal is within a preset error range, where the preset error range includes a small error range and a large error range;

[0008] When the signal strength error is within the small error range, adjusting a gain control unit in the signal acquisition circuit to compensate for a slight change in signal strength; when the signal strength error is within the large error range, adjusting the square wave frequency of the excitation signal in an excitation signal adjustment circuit in the inductive angle sensor system to compensate for a large change in signal strength.

[0009] In a second aspect, the present invention provides a device for controlling the reliability of an inductive angle sensor within the full temperature range. The device for controlling the reliability of an inductive angle sensor within the full temperature range uses the above-mentioned method for controlling the reliability of an inductive angle sensor within the full temperature range to control the reliability of the inductive angle sensor within the full temperature range.

[0010] Compared with the prior art, the present invention has the following beneficial effects:

[0011] The present invention provides a control method and device for the reliability of an inductive angle sensor within a full temperature range. A SIN position signal and a COS position signal are collected from the inductive angle sensor by a signal acquisition circuit in an inductive angle sensor system, and the SIN position signal and the COS position signal are filtered and preliminarily amplified to obtain an amplified SIN position signal and an amplified COS position signal. The signal strengths of the amplified SIN position signal and the amplified COS position signal are detected in real time to determine whether the signal strength errors of the amplified SIN position signal and the amplified COS position signal are within a preset error range, wherein the preset error range includes a small error range and a large error range. When the signal strength error is within the small error range, a gain control unit in the signal acquisition circuit is adjusted to compensate for a small change in signal strength. When the signal strength error is within the large error range, a square wave frequency of an excitation signal in an excitation signal adjustment circuit in the inductive angle sensor system is adjusted to compensate for a large change in signal strength, thereby improving the reliability and accuracy of the inductive angle sensor within a full temperature range. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their description are used to explain the present invention and do not constitute an improper limitation of the present invention. Some specific embodiments of the present invention will be described in detail in an exemplary and non-restrictive manner with reference to the drawings. The same reference numerals in the drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the drawings:

[0013] Figure 1 It is a flow chart of a method for controlling the reliability of an inductive angle sensor within a full temperature range according to an embodiment of the present invention;

[0014] Figure 2 It is a circuit diagram of a signal acquisition circuit according to an embodiment of the present invention;

[0015] Figure 3 is another circuit schematic diagram of the signal acquisition circuit of an embodiment of the present invention;

[0016] Figure 4 It is a circuit schematic diagram of the excitation signal adjustment circuit according to an embodiment of the present invention;

[0017] Figure 5 It is another circuit schematic diagram of the excitation signal adjustment circuit according to an embodiment of the present invention. Detailed implementation manners

[0018] In order to enable those skilled in the art to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0019] Embodiment 1

[0020] Refer to Figures 1 - 5 , this embodiment provides a method for controlling the reliability of an inductive angle sensor within the full temperature range, including the following steps:

[0021] S101. Collect the SIN position signal and the COS position signal from the inductive angle sensor through the signal acquisition circuit in the inductive angle sensor system, and filter and preliminarily amplify the SIN position signal and the COS position signal to obtain the amplified SIN position signal and the amplified COS position signal;

[0022] S102. Perform real-time detection on the signal intensities of the amplified SIN position signal and the amplified COS position signal, and determine whether the signal intensity error between the signal intensity of the amplified SIN position signal and the signal intensity of the amplified COS position signal is within a preset error range, where the preset error range includes a small error range and a large error range; wherein, the small error range can represent that the signal intensity change between the signal intensity of the amplified SIN position signal and the signal intensity of the amplified COS position signal is within ±5%; the large error range can represent that the signal intensity change between the signal intensity of the amplified SIN position signal and the signal intensity of the amplified COS position signal exceeds ±20%.

[0023] S103. When the signal intensity error is within the small error range, adjust the gain control unit in the signal acquisition circuit to compensate for the small change in signal intensity; when the signal intensity error is within the large error range, adjust the square wave frequency of the excitation signal in the excitation signal adjustment circuit of the inductive angle sensor system to compensate for the large change in signal intensity.

[0024] It should be noted that in the wide temperature range from -55°C to 85°C, temperature changes will cause the capacitance value of the LC resonant circuit capacitor to drift, which in turn affects the resonant frequency and causes fluctuations in the excitation signal intensity. In addition, as the temperature changes, the resistance of the PCB planar coil increases or decreases, which will also change the efficiency of mutual inductance coupling and further affect the signal intensity. The superposition of these factors may cause the intensity of the mutual inductance coupling signal to change by 4-5 times in the wide temperature range, resulting in unstable sensor output signals and reducing the angle measurement accuracy. In step S101, the SIN position signal and COS position signal generated by the inductive angle sensor are collected through the signal acquisition circuit, and the collected signals are filtered and preliminarily amplified to remove high-frequency noise and enhance the signal intensity. Among them, filtering and preliminary amplification can improve the anti-interference ability of the signal, reduce the influence of high-frequency noise or weak signals caused by temperature changes on the measurement accuracy, and provide a stable signal basis for subsequent error detection and compensation. In step S102, the intensities of the amplified SIN position signal and COS position signal are detected in real time, and it is judged whether the signal intensity error is within the preset range, and the error range is subdivided into a small error range and a large error range. By detecting the signal intensity change in real time, the signal intensity drift caused by temperature changes can be quickly discovered. And by accurately dividing the error range, a hierarchical compensation strategy can be adopted for different intensity errors to ensure the reliability of the signal in the wide temperature range. In step S103, when the signal intensity error is within the small error range, the gain control unit in the signal acquisition circuit is adjusted to compensate for the slight change in signal intensity. When the signal intensity error is within the large error range, the square wave frequency of the excitation signal adjustment circuit is adjusted to compensate for the large signal intensity change at the source. Among them, it is necessary to cope with the slight drift of the LC resonant frequency or the slight change of the coil resistance caused by temperature changes, so that the signal intensity is maintained within the normal range. Through gain adjustment, fast and low-power fine-tuning can be achieved, which is suitable for real-time compensation of signal changes in the normal working state. In addition, it solves the problem that the LC resonant frequency seriously deviates or the coupling efficiency is significantly reduced due to drastic temperature changes. By adjusting the frequency of the excitation signal, the LC resonant circuit can be rematched to restore the normal excitation intensity and solve the problem of abnormal signal intensity at the source.

[0025] In some preferred embodiments, after adjusting the gain control unit in the signal acquisition circuit to compensate for small changes in signal strength, feedback detection is performed on the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal. It is determined whether the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal are within a preset allowable range. If they are not within the allowable range, the gain control unit in the signal acquisition circuit is continuously adjusted to compensate for small changes in signal strength. It should be noted that within the wide temperature range of -55°C to 85°C, the capacitance and coil resistance of the LC resonant circuit do not change linearly and may undergo dynamic changes with rapid fluctuations in time and environment. Single gain adjustment is difficult to track the changing pattern of temperature in real time, which may lead to insufficient or overcompensation of signal strength, resulting in the final output signal still possibly deviating from the preset range. In this embodiment, the compensated signal is rechecked through a feedback detection mechanism, and further fine-tuning of the gain control unit is allowed to achieve multiple dynamic compensations, ensuring that the final signal strength fully meets the preset allowable range and improving the accuracy and reliability of the compensation.

[0026] In some preferred embodiments, after adjusting the square wave frequency of the excitation signal in the excitation signal adjustment circuit in the inductive angle sensor system to compensate for large changes in signal strength, feedback detection is performed on the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal. It is determined whether the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal are within a preset allowable range. If they are not within the allowable range, the square wave frequency of the excitation signal in the excitation signal adjustment circuit in the inductive angle sensor system is continuously adjusted to compensate for large changes in signal strength. It should be noted that within the wide temperature range, the capacitance and coil resistance of the LC resonant circuit may exhibit complex non-linear dynamic changes, and it may be difficult to fully compensate for the drift of signal strength by single adjustment alone. In this embodiment, through the feedback detection mechanism, the adjusted signal strength is rechecked in real time. If the compensated signal strength still does not reach the preset range, the square wave frequency of the excitation signal is continuously adjusted dynamically to ensure that the signal strength is fully restored to the normal range. Through multiple dynamic adjustments, the error problem caused by single compensation is overcome, and the accuracy of excitation signal compensation is further improved. Temperature changes will cause drift in the capacitance value and inductance value of the LC resonant circuit, and this change is non-linear. In addition, rapid temperature changes or long-term drift may cause continuous fluctuations in the output strength of the excitation signal. In this embodiment, through feedback detection and multiple dynamic adjustments of the frequency of the excitation signal, the change in signal strength caused by non-linear drift can be tracked and compensated in real time. The dynamic adjustment mechanism can ensure that the resonance efficiency of the excitation signal always remains in the best state within the wide temperature range, fundamentally solving the problem of signal strength fluctuation.

[0027] In some preferred embodiments, when the signal acquisition circuit acquires the SIN position signal and the COS position signal from the inductive angle sensor, it includes: the inductive angle sensor outputs the SIN position signal and the COS position signal through the mutual inductance coupling of the PCB planar coil; the signal acquisition circuit acquires the output SIN position signal and the COS position signal. It should be noted that in the inductive angle sensor system, the PCB planar coil is one of the core components of the inductive angle sensor. Through mutual inductance coupling, SIN signals and COS signals reflecting angle information can be generated. The SIN signal and the COS signal output by the PCB planar coil directly enter the signal acquisition circuit after mutual inductance coupling, which can ensure the stability and consistency of the transmission process of the SIN signal and the COS signal from the sensor to the acquisition circuit.

[0028] In some preferred embodiments, when adjusting the gain control unit in the signal acquisition circuit to compensate for small changes in signal strength, it includes: adjusting the path switching of the amplifier in the gain control unit to adjust the gain and compensate for small changes in signal strength. Or, when adjusting the gain control unit in the signal acquisition circuit to compensate for small changes in signal strength, it includes: adjusting the gain resistance value of the gain resistor in the gain control unit to adjust the gain and compensate for small changes in signal strength. It should be noted that by switching different amplifier paths, rapid adjustment of fixed gain can be achieved, which is suitable for scenarios with relatively low requirements for signal strength but high requirements for rapid response. The path switching design is relatively simple and the circuit implementation is easy, making it suitable for fields with high requirements for response speed such as industrial automation. In addition, by adjusting the resistance value of the gain resistor, more precise gain control can be achieved, which is suitable for precision measurement scenarios with high requirements for signal strength, can provide higher flexibility, and is applicable to scenarios that require precise compensation for temperature changes or signal fluctuations, such as avionics or high-precision instruments. In this embodiment, the path switching method can quickly adjust the gain to compensate for small-amplitude signal strength fluctuations caused by temperature changes or environmental interference, with fast response speed and low power consumption. The gain resistor adjustment method can achieve fine control to cope with the slow offset of signal strength caused by component aging, long-term temperature drift, or other gradual changes. By adjusting the resistance value of the gain resistor, the gain can be gradually fine-tuned to ensure that the signal strength is stable within the allowable range.

[0029] In some further embodiments, the signal acquisition circuit includes a signal input and filtering unit, a gain control unit, a differential amplification unit, and a filtering and reference adjustment unit; the SIN position signal and the COS position signal are collected as input signals into the signal input and filtering unit for filtering processing to obtain a filtered input signal, and the filtered input signal is transmitted to the gain control unit to receive gain adjustment, and the gain-adjusted signal is input into the differential amplification unit. The differential amplification unit filters and adjusts the reference of the gain-adjusted signal, and outputs stable SIN_AD signal and COS_AD signal. It should be noted that the output signals (SIN and COS position signals) of the inductive angle sensor are easily affected by noise, electromagnetic interference and other environmental factors. Directly collecting and processing the original signals may lead to a decrease in accuracy. The signal input and filtering unit effectively suppresses high-frequency noise in the input signal through a filtering circuit (such as a capacitor or a low-pass filter) to ensure that the subsequent units receive a pure input signal. This hierarchical filtering design can significantly improve the anti-noise ability of the system to environmental interference. Changes in the wide temperature range or the sensor installation environment may cause fluctuations in the signal intensity, affecting subsequent signal processing and output. The gain control unit adapts to the intensity change of the input signal by dynamically adjusting the amplifier gain (such as switching the amplifier path or adjusting the gain resistance value), and compensates for the signal attenuation or enhancement caused by environmental changes. Dynamic gain adjustment can ensure that the signal intensity remains within an appropriate range in the subsequent processing links, avoiding non-linear distortion or signal loss caused by too strong or too weak signals.

[0030] In some further embodiments, the signal input and filtering unit includes a capacitor C61. The capacitor C61 is connected to the SIN position signal for filtering, and the filtered SIN input signal is output to the SIN signal gain control unit for gain adjustment. The SIN signal gain control unit includes resistors R57, R59, R53, R56, amplifiers U27A, U27B, and amplifier U28. One end of resistors R57 and R59 is connected to the signal output end of capacitor C61. The other end of resistor R57 is connected to one input end of amplifier U27B, and the other end of resistor R59 is connected to one input end of amplifier U27A. The signal output end of capacitor C61 is also directly connected to the other input ends of amplifiers U27A and U27B respectively. The output end of amplifier U27A is connected to one end of resistor R56, and the output end of amplifier U27B is connected to one end of resistor R53. The other ends of resistors R56 and R53 are respectively connected to the two input ends of amplifier U28. The output end of amplifier U28 outputs the SIN signal after gain adjustment and inputs it to the SIN signal differential amplification unit for filtering and reference adjustment. The SIN signal differential amplification unit includes resistors R55, R22, capacitor C58, capacitor C17, operational amplifier U26, resistor R24, resistor R52, resistor R54, capacitor C20, and capacitor C60. One end of resistor R55 is connected to the output end of amplifier U28, one end of resistor R22, and one end of capacitor C17. The other end of resistor R55 is connected to the inverting input end of operational amplifier U26 and one end of capacitor C58. The other ends of resistor R22 and capacitor C17 are connected to the output end of operational amplifier U26 and one end of resistor R24. The other end of capacitor C58 is connected to the non-inverting input end of operational amplifier U26 and one end of resistor R52. The other end of resistor R52 is connected to one end of resistor R54 and capacitor C60. The other ends of resistor R54 and capacitor C60 are connected. The other end of resistor R24 is connected to one end of capacitor C20, and a stable SIN AD signal is output. The other end of capacitor C20 is grounded. It should be noted that the capacitor C61 filters the input SIN position signal, mainly filtering out high-frequency noise and retaining effective low-frequency or intermediate-frequency signals. The filtered signal is sent to the SIN signal gain control unit for subsequent processing, providing a clean SIN input signal, reducing the influence of external electromagnetic interference and high-frequency noise, and laying a foundation for subsequent signal amplification and processing. The filtered SIN signal is shunted to resistors R57 and R59 through capacitor C61, and then enters amplifiers U27A and U27B, allowing simultaneous gain adjustment of the signal in different paths. Amplifiers U27A and U27B preliminarily amplify the input signal, and the gain of the amplifier is determined by the input resistors (R57, R59) connected to it. The outputs of amplifiers U27A and U27B are sent to amplifier U28 through R56 and R53 respectively.Amplifier U28 further combines and amplifies the signals from different channels and outputs the SIN signal after gain adjustment. The finally gain-adjusted signal is output from amplifier U28 and enters the SIN signal differential amplification unit, thereby dynamically adjusting the signal gain to compensate for the change in the input signal strength and ensuring that the signal amplitude meets the requirements of subsequent processing. The gain-adjusted signal output by amplifier U28 is sent to the inverting input terminal of differential amplifier U26 through resistor R55 to form a differential input. The non-inverting input terminal is connected to the reference point through capacitor C58 to eliminate the common-mode noise in the signal. The output terminal of operational amplifier U26 returns to the inverting input terminal through the feedback network (R22 and C17) to form negative feedback and stabilize the output signal. The differentially amplified signal passes through low-pass filtering (C60 and R52, R54) to remove the residual high-frequency interference. After the reference voltage (provided by R24 and C20) is superimposed on the output terminal signal, the final stable SIN AD signal is output. In this embodiment, through the multi-stage filtering design of capacitor C61 and the filtering network (such as C60 and R52, R54), the high-frequency noise and electromagnetic interference in the input signal can be effectively removed. The differential amplification unit further enhances the anti-interference ability of the signal by eliminating the common-mode interference. The gain control unit supports the adjustment of multi-channel signals (through amplifiers U27A, U27B, and U28), can dynamically adjust the signal gain, and adapt to the change in the input signal strength under different environments. This dynamic gain adjustment function can ensure the flexibility and robustness of the signal processing circuit. Differential amplifier U26 effectively eliminates the common-mode noise and ensures the linearity of the output signal. The reference voltage provided by the filtering and reference adjustment unit ensures the stability of the signal amplitude range, avoids non-linear distortion, and improves the accuracy of angle decoding. The output signal undergoes multi-stage processing (filtering, gain adjustment, differential amplification, reference adjustment) and finally obtains a high-precision and low-noise SIN AD signal. The stable SIN AD signal meets the input requirements of the subsequent digital signal processing unit (such as a microcontroller or DSP) and provides guarantee for high-precision angle measurement. The multi-stage filtering and dynamic gain adjustment design can effectively cope with the influence of temperature change on the input signal strength and noise. The high linearity and stability design of the differential amplifier can ensure the reliability and signal quality of the circuit within a wide temperature range.

[0031] In some further embodiments, the signal input and filtering unit includes a capacitor C53. The capacitor C53 is connected to the COS position signal for filtering, and the filtered COS input signal is output to the COS signal gain control unit for gain adjustment. The COS signal gain control unit includes resistors R45, R44, R48, R58, amplifiers U24B, U24C, and U24A. One end of resistors R45 and R44 is connected to the signal output end of capacitor C53. The other end of resistor R45 is connected to one input end of amplifier U24C, and the other end of resistor R44 is connected to one input end of amplifier U24B. The signal output end of capacitor C53 is also directly connected to the other input ends of amplifiers U24B and U24C respectively. The output end of amplifier U24B is connected to one end of resistor R58, and the output end of amplifier U24C is connected to one end of resistor R48. The other ends of resistors R58 and R48 are respectively connected to the two input ends of amplifier U24A. The output end of amplifier U24A outputs the gain-adjusted COS signal and inputs it to the COS signal differential amplification unit for filtering and reference adjustment. The COS signal differential amplification unit includes resistors R46, R50, capacitors C54, C55, operational amplifier U25, resistor R25, resistors R49, R47, capacitor C21, and capacitor C52. One end of resistor R46 is connected to the output end of amplifier U24A, one end of resistor R50, and one end of capacitor C55. The other end of resistor R46 is connected to the inverting input end of operational amplifier U25 and one end of capacitor C54. The other ends of resistor R50 and capacitor C55 are connected to the output end of operational amplifier U25 and one end of resistor R25. The other end of capacitor C54 is connected to the non-inverting input end of operational amplifier U25 and one end of resistor R49. The other end of resistor R49 is connected to one ends of resistor R47 and capacitor C52. The other ends of resistor R47 and capacitor C52 are connected. The other end of resistor R25 is connected to one end of capacitor C21, and the stable COS_AD signal is output. The other end of capacitor C21 is grounded. It should be noted that this embodiment can be understood by referring to the description of the above embodiment, and this embodiment will not be elaborated here.

[0032] In some preferred embodiments, when adjusting the square wave frequency of the excitation signal in the excitation signal adjustment circuit of the inductive angle sensor system to compensate for large changes in signal strength, it includes: adjusting the square wave frequency of the excitation signal in the excitation signal adjustment circuit of the inductive angle sensor system to obtain an excitation signal after the square wave frequency changes. The excitation signal after the square wave frequency changes is input into the LC resonance circuit of the excitation signal adjustment circuit to change the output strength of the LC resonance circuit and compensate for large changes in signal strength. It should be noted that the LC resonance circuit is the core module for generating the excitation signal in the inductive angle sensor system, and its resonance frequency depends on the capacitance and inductance parameters. In a wide temperature range (such as -55°C to 85°C), the capacitance and inductance in the LC circuit will drift significantly due to temperature changes, resulting in a significant change in the output strength of the excitation signal. If large changes in signal strength are not compensated, the output signals (SIN position signal and COS position signal) of the sensor will be severely distorted, leading to a decrease in measurement accuracy. In this embodiment, by adjusting the square wave frequency of the excitation signal, the signal frequency input into the LC resonance circuit is changed, enabling the LC resonance circuit to re-match the resonance point, thereby restoring the output strength of the excitation signal. This method can compensate for large-amplitude strength changes from the source of signal generation, ensuring the reliability of the output signal.

[0033] In some further embodiments, the excitation signal adjustment circuit includes an excitation signal input unit, a power switch unit, and an LC resonance unit; the excitation signal input unit provides a clock signal to drive the power switch of the power switch unit; the power switch unit switches states according to the clock signal and drives the LC resonance unit to generate a high-strength excitation signal. It should be noted that in the inductive angle sensor, the strength of the excitation signal is crucial for the amplitude and accuracy of the output signal. In a wide temperature range (such as -55°C to 85°C), the signal strength may decay or drift due to environmental changes. In this embodiment, the excitation signal input unit can provide a stable clock signal to drive the power switch unit, ensuring the high stability of the frequency and duty cycle of the excitation signal. The power switch unit converts the input clock signal into a high-frequency excitation signal capable of driving the LC resonance unit, further enhancing the strength of the excitation signal. The LC resonance unit converts the output signal of the power switch unit into a high-amplitude sine wave excitation signal through resonance amplification, ensuring that the strength of the excitation signal meets the system requirements. Additionally, the resonance frequency of the LC resonance circuit depends on the inductance and capacitance parameters, and these parameters will drift with temperature changes, resulting in a decrease in resonance efficiency. In this embodiment, the excitation signal input unit dynamically adjusts the frequency of the input clock signal to match the resonance frequency of the LC resonance circuit, thereby maintaining the resonance efficiency. This frequency self-adaptive ability can effectively compensate for the LC parameter drift caused by temperature changes, ensuring that the strength of the excitation signal output by the resonance circuit is always stable.

[0034] In some further embodiments, the excitation signal input unit includes a current-limiting resistor R206 and a current-limiting resistor R203. The current-limiting resistor R206 is connected to the clock signal CLK-2M. After the clock signal CLK-2M is divided by the current-limiting resistor R206 and the current-limiting resistor R203, it is output to the power switch unit that processes the clock signal CLK-2M. The power switch unit that processes the clock signal CLK-2M switches its state according to the clock signal CLK-2M and drives the first LC resonance unit to generate a high-intensity excitation signal HV0. The power switch unit that processes the clock signal CLK-2M includes a MOSFET switch Q201.1 and a MOSFET switch Q201.2. The clock signal CLK-2M is connected to one end of the current-limiting resistor R206 and one end of the current-limiting resistor R203. The other end of the current-limiting resistor R206 is connected to the power supply and the source electrode of the MOSFET switch Q201.1. The other end of the current-limiting resistor R203 is connected to the gate electrodes of the MOSFET switch Q201.1 and the MOSFET switch Q201.2. The drain electrodes of the MOSFET switch Q201.1 and the MOSFET switch Q201.2 are connected to the first LC resonance unit. The source electrode of the OSFET switch Q201.2 is grounded. The first LC resonance unit includes an inductor L201 and a capacitor C204. One end of the inductor L201 is connected to the drain electrodes of the MOSFET switch Q201.1 and the MOSFET switch Q201.2. The other end of the inductor L201 is connected to one end of the capacitor C204, and the excitation signal HV0 is output. The other end of the capacitor C204 is grounded. It should be noted that the clock signal CLK-2M is divided by the current-limiting resistors R206 and R203, and the divided signal enters the power switch unit. The voltage-dividing function of the current-limiting resistors R206 and R203 stabilizes the signal voltage input to the MOSFET gate of the power switch unit within a safe range, avoiding damage to the MOS transistor by too high an input signal. The current-limiting resistor R206 is also connected to the power supply to provide a bias current for the power switch, enabling the circuit to operate normally. The divided clock signal CLK-2M controls the gate voltages of the MOSFET switches Q201.1 and Q201.2, causing them to conduct or cut off alternately according to the frequency and duty cycle of the CLK-2M signal. When Q201.1 conducts, the power supply current passes through the inductor L201 and the MOSFET switch Q201.1 to provide current for the LC resonance unit. When the MOSFET switch Q201.1 cuts off and the MOSFET switch Q201.2 conducts, the LC circuit stores and releases energy, generating an oscillation signal. The alternating switching of the MOSFET switch Q201.1 and the MOSFET switch Q201.2 forms an excitation source for high-frequency signals, providing periodic drive for the LC resonance circuit.After the LC resonant circuit composed of inductor L201 and capacitor C204 receives the high-frequency pulse signal output by the power switch unit, it amplifies the amplitude of the signal through the resonant characteristic and converts the high-frequency pulse into a high-intensity sine wave signal. One end of inductor L201 is connected to the drains of MOSFET switch tubes Q201.1 and Q201.2, and the other end is connected to capacitor C204. During the resonance process, the energy between the inductor and the capacitor is alternately stored and released, and a stable sine wave excitation signal HV 0 is output. The output end of the LC resonant circuit generates a high-intensity sine excitation signal HV 0 for use by the subsequent inductive angle sensor. The other end of capacitor C204 is grounded to ensure the stability of the reference benchmark of the output signal and prevent noise interference during the resonance process. In this embodiment, the divided clock signal drives the power switch unit to ensure that the gate signal of the MOSFET switch operates within a safe range. The power switch unit converts the square wave signal into a high-frequency pulse current to drive the LC resonant circuit to work. The LC resonant unit converts the input pulse signal into a high-intensity sine wave excitation signal HV 0 through resonance amplification. The output excitation signal has high intensity and stability, meeting the requirements of the inductive angle sensor for the excitation signal. Current-limiting resistors R206 and R203 regulate the input signal current to prevent the gate of the MOSFET from getting out of control or being damaged due to too strong an input signal. The resonant characteristic of the LC resonant circuit can effectively filter out high-frequency noise, convert the pulse signal into a pure sine wave signal, improve the purity and stability of the output signal, and avoid signal distortion of the sensor caused by noise or interference. The MOSFET switch tube operates in two states: on and off, with small switching losses and high energy utilization rate. The LC resonant unit amplifies the output signal through resonance, with low energy loss, reduces the power consumption of the circuit, improves the energy conversion efficiency, and enables the system to operate efficiently and stably within a wide temperature range.

[0035] In some further embodiments, the excitation signal input unit includes a current-limiting resistor R204 and a current-limiting resistor R205. The current-limiting resistor R204 is connected to the clock signal CLK-2M 180. After the clock signal CLK-2M 180 is divided by the current-limiting resistor R204 and the current-limiting resistor R205, it is output to the power switch unit that processes the clock signal CLK-2M 180. The power switch unit that processes the clock signal CLK-2M 180 switches its state according to the clock signal CLK-2M 180 and drives the second LC resonance unit to generate a high-strength excitation signal HV 180. The power switch unit that processes the clock signal CLK-2M 180 includes a MOSFET switch tube Q202.1 and a MOSFET switch tube Q202.2. One end of the clock signal CLK-2M 180 is connected to one end of the current-limiting resistor R204 and one end of the current-limiting resistor R205. The other end of the current-limiting resistor R204 is connected to the power supply and the source electrode of the MOSFET switch tube Q202.1. The other end of the current-limiting resistor R205 is connected to the gate electrodes of the MOSFET switch tube Q202.1 and the MOSFET switch tube Q202.2. The drain electrodes of the MOSFET switch tube Q202.1 and the MOSFET switch tube Q202.2 are connected to the second LC resonance unit. The source electrode of the OSFET switch tube Q202.2 is grounded. The second LC resonance unit includes an inductor L202 and a capacitor C205. One end of the inductor L202 is connected to the drain electrodes of the MOSFET switch tube Q202.1 and the MOSFET switch tube Q202.2. The other end of the inductor L202 is connected to one end of the capacitor C205 to output the excitation signal HV180. The other end of the capacitor C205 is grounded. It should be noted that this embodiment can be understood by referring to the description content in the above embodiments, and this embodiment will not be elaborated here.

[0036] Embodiment 2

[0037] See Figures 1 - 5 , this embodiment provides a control device for the reliability of an inductive angle sensor within the full temperature range. The control device for the reliability of the inductive angle sensor within the full temperature range uses the control method for the reliability of the inductive angle sensor within the full temperature range described in any of the above embodiments to control the reliability of the inductive angle sensor within the full temperature range.

[0038] The above embodiments are only preferred specific implementation manners of the present invention, and the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. The protection scope of the present invention should be subject to the protection scope of the claims.

Claims

1. A method for controlling the reliability of an inductive angle sensor within a full temperature range, characterized in that: include: The SIN position signal and the COS position signal are collected from the inductive angle sensor by a signal collection circuit in the inductive angle sensor system, and the SIN position signal and the COS position signal are filtered and preliminarily amplified to obtain an amplified SIN position signal and an amplified COS position signal; Performing real-time detection of the signal strength of the amplified SIN position signal and the amplified COS position signal to determine whether a signal strength error between the signal strength of the amplified SIN position signal and the signal strength of the amplified COS position signal is within a preset error range, wherein the preset error range includes a small error range and a large error range; When the signal strength error is within the small error range, the gain control unit in the signal acquisition circuit is adjusted to compensate for a slight change in signal strength; when the signal strength error is within the large error range, the square wave frequency of the excitation signal in the excitation signal adjustment circuit in the inductive angle sensor system is adjusted to compensate for a large change in signal strength; the small error range indicates that the signal strength change of the amplified SIN position signal and the amplified COS position signal is within ±5%; the large error range indicates that the signal strength change of the amplified SIN position signal and the amplified COS position signal exceeds ±20%; When adjusting the square wave frequency of the excitation signal in the excitation signal adjustment circuit in the inductive angle sensor system to compensate for the large change in signal strength, it includes: adjusting the square wave frequency of the excitation signal in the excitation signal adjustment circuit in the inductive angle sensor system to obtain the excitation signal after the square wave frequency is changed, and the excitation signal after the square wave frequency is changed is input into the LC resonant circuit of the excitation signal adjustment circuit to change the output strength of the LC resonant circuit to compensate for the large change in signal strength.

2. The method for controlling the reliability of an inductive angle sensor in a full temperature range as claimed in claim 1, characterized in that: After adjusting the gain control unit in the signal acquisition circuit to compensate for slight changes in signal strength, feedback detection is performed on the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal to determine whether the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal are within a preset allowable range. If not within the allowable range, continue to adjust the gain control unit in the signal acquisition circuit to compensate for slight changes in signal strength.

3. The method for controlling the reliability of an inductive angle sensor in a full temperature range as claimed in claim 1, characterized in that: After adjusting the square wave frequency of the excitation signal in the excitation signal adjustment circuit in the inductive angle sensor system to compensate for the large change in signal strength, feedback detection is performed on the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal to determine whether the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal are within a preset allowable range. If not within the allowable range, continue to adjust the square wave frequency of the excitation signal in the excitation signal adjustment circuit in the inductive angle sensor system to compensate for the large change in signal strength.

4. The method for controlling the reliability of an inductive angle sensor in a full temperature range according to any one of claims 1 to 3, characterized in that: When the signal acquisition circuit acquires the SIN position signal and the COS position signal from the inductive angle sensor, it includes: the inductive angle sensor outputs the SIN position signal and the COS position signal through the mutual inductance coupling of the PCB planar coil; and the signal acquisition circuit acquires the output SIN position signal and the COS position signal.

5. The method for controlling the reliability of an inductive angle sensor in a full temperature range as claimed in claim 1, characterized in that: When adjusting the gain control unit in the signal acquisition circuit to compensate for a slight change in signal strength, it includes: adjusting the path switching of the amplifier in the gain control unit to adjust the gain and compensate for the slight change in signal strength.

6. The method for controlling the reliability of an inductive angle sensor in a full temperature range as claimed in claim 1, characterized in that: When adjusting the gain control unit in the signal acquisition circuit to compensate for a slight change in signal strength, it includes: adjusting the gain resistance value of the gain resistor in the gain control unit to adjust the gain and compensate for the slight change in signal strength.

7. A control device for the reliability of an inductive angle sensor within the full temperature range, characterized in that: The device for controlling the reliability of the inductive angle sensor within the full temperature range uses the method for controlling the reliability of the inductive angle sensor within the full temperature range as described in any one of claims 1 to 6 to control the reliability of the inductive angle sensor within the full temperature range.

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