Method and device for controlling reliability of inductive angle sensor in full temperature range

Abstract

The invention relates to the technical field of intelligent sensor systems and the like, and provides a method and a device for controlling the reliability of an inductive angle sensor in a full-temperature range, SIN position signals and COS position signals are collected and then filtered and preliminarily amplified, the amplified SIN position signals and the amplified COS position signals are obtained, the signal intensity is detected in real time, and the reliability of the inductive angle sensor in the full-temperature range is improved. Judging whether the signal strength error is within a preset error range, the preset error range comprises a small error range and a large error range, when the signal strength error is within the small error range, adjusting a gain control unit in the signal acquisition circuit so as to compensate the small change of the signal strength, and when the signal strength error is within the large error range, adjusting the gain control unit in the signal acquisition circuit so as to compensate the small change of the signal strength. The square wave frequency of the excitation signal in the excitation signal adjusting circuit in the induction type angle sensor system is adjusted to compensate the large change of the signal intensity, so that the reliability and the precision of the induction type angle sensor in the full temperature range are improved.

Description

Technical Field

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

[0002] At present, in the inductive angle sensor system, the LC resonant circuit generates an excitation signal, which is coupled through the mutual inductance of the PCB planar coil to generate an angle position signal. Within the 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, and the cumulative superposition can eventually cause the mutual inductance coupling signal to produce a 4-5 times intensity change, 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, existing inductive angle sensors have technical problems such as reduced reliability and reduced accuracy within the full temperature range. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the present invention provides a method and device for controlling the reliability of an inductive angle sensor within a full temperature range, so as to improve the reliability and accuracy of the inductive angle sensor within a full temperature range.

[0005] In a first aspect, the present invention provides a method for controlling the reliability of an inductive angle sensor within a full temperature range, comprising: 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 slight changes 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 larger changes in signal strength.

[0006] 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.

[0007] Compared with the prior art, the present invention has the following beneficial effects: 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

[0008] 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: 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; Figure 2 It is a circuit diagram of a signal acquisition circuit according to an embodiment of the present invention; Figure 3 is another circuit schematic diagram of the signal acquisition circuit of an embodiment of the present invention; Figure 4 is a circuit diagram of an excitation signal adjustment circuit according to an embodiment of the present invention; Figure 5 This is another circuit diagram of the excitation signal adjustment circuit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0009] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only an embodiment of a part of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work should fall within the scope of protection of the present invention.

[0010] Embodiment 1 See also Figure 1-Figure 5 This embodiment provides a method for controlling the reliability of an inductive angle sensor within a full temperature range, comprising the following steps: S101, collecting a SIN position signal and a COS position signal from the inductive angle sensor through a signal collection 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; S102. Perform real-time detection of the signal strength of the amplified SIN position signal and the amplified COS position signal to determine whether the signal strength errors of the signal strength of the amplified SIN position signal and the signal strength of 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; wherein the small error range can represent that the signal strength variation of the signal strength of the amplified SIN position signal and the signal strength of the amplified COS position signal is within ±5%; and the large error range can represent that the signal strength variation of the signal strength of the amplified SIN position signal and the signal strength of the amplified COS position signal exceeds ±20%.

[0011] S103. 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 slight changes 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 large changes in signal strength.

[0012] It should be noted that, within a wide temperature range of -55 ° C to 85 ° C, temperature changes can cause the capacitance value of the LC resonant circuit capacitor to drift, thereby affecting the resonant frequency and causing the excitation signal intensity to fluctuate. In addition, as the temperature changes, the resistance of the PCB plane coil increases or decreases, which will also change the efficiency of the mutual inductance coupling, further affecting the signal strength. The superposition of these factors may cause the intensity of the mutual inductance coupling signal to change by 4-5 times within a wide temperature range, resulting in an unstable sensor output signal, thereby reducing the angle measurement accuracy. In step S101, the SIN position signal and COS position signal generated by the inductive angle sensor are collected by the signal acquisition circuit, and the collected signal is filtered and preliminarily amplified to remove high-frequency noise and enhance the signal strength. 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 strength of the amplified SIN position signal and COS position signal is detected in real time, and it is determined whether the signal strength 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 change of signal strength in real time, the signal strength drift caused by temperature change can be quickly found. And by accurately dividing the error range, a hierarchical compensation strategy can be adopted for different strength errors to ensure the reliability of the signal within a wide temperature range. In step S103, when the signal strength error is within a small error range, the gain control unit in the signal acquisition circuit is adjusted to compensate for the slight change in signal strength. When the signal strength error is within a large error range, the square wave frequency of the excitation signal adjustment circuit is adjusted to compensate for the larger signal strength change from the source. Among them, the signal strength is maintained within the normal range in response to the slight drift of the LC resonant frequency or the slight change of the coil resistance caused by temperature changes. Fast and low-power fine-tuning is achieved through gain adjustment, which is suitable for real-time compensation of signal changes under normal working conditions. In addition, the problem of severe deviation of the LC resonant frequency or significant reduction in coupling efficiency due to drastic temperature changes is solved. By adjusting the frequency of the excitation signal, the LC resonant circuit can be re-matched, the normal excitation intensity is restored, and the problem of abnormal signal strength is solved from the root.

[0013] In some preferred embodiments, after adjusting the gain control unit in the signal acquisition circuit to compensate for the slight change in signal strength, the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal are feedback detected to determine whether the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal are within the preset allowable range. If not within the allowable range, continue to adjust the gain control unit in the signal acquisition circuit to compensate for the slight change 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 change dynamically with the rapid fluctuation of time and environment. A single gain adjustment is difficult to track the temperature change in real time, which may lead to insufficient or over-compensation of the signal strength, resulting in the final output signal still being likely to deviate from the preset range. In this embodiment, the compensated signal is reviewed by 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 compensation.

[0014] 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 the large change in signal strength, the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal are feedback detected to determine whether the signal strength of the compensated SIN position signal and the signal strength of the compensated COS position signal are within the 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. It should be noted that within a wide temperature range, the capacitance and coil resistance of the LC resonant circuit may undergo complex nonlinear dynamic changes, and it may be difficult to fully compensate for the drift of the signal strength by a single adjustment alone. In this embodiment, the adjusted signal strength is reviewed in real time through a feedback detection mechanism. If the compensated signal strength still does not reach the preset range, continue to dynamically adjust the square wave frequency of the excitation signal to ensure that the signal strength is fully restored to the normal range. Through multiple dynamic adjustments, the error problem caused by a single compensation is overcome, and the accuracy of the excitation signal compensation is further improved. Temperature changes can cause the capacitance and inductance of the LC resonant circuit to drift, and this change is nonlinear. In addition, rapid temperature changes or long-term drifts may cause the output strength of the excitation signal to continue to fluctuate. In this embodiment, through feedback detection and multiple dynamic adjustments to the frequency of the excitation signal, the signal strength changes caused by nonlinear drift can be tracked and compensated in real time. The dynamic adjustment mechanism can ensure that the resonance efficiency of the excitation signal in a wide temperature range is always kept at the best state, fundamentally solving the problem of signal strength fluctuations.

[0015] In some preferred embodiments, when the signal acquisition circuit collects 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 collects 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, and through mutual inductance coupling, a SIN signal and a COS signal reflecting the 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 that the transmission process of the SIN signal and the COS signal from the sensor to the acquisition circuit can maintain stability and consistency.

[0016] In some preferred embodiments, when the gain control unit in the signal acquisition circuit is adjusted 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 to compensate for a slight change in signal strength. Alternatively, when the gain control unit in the signal acquisition circuit is adjusted 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 to compensate for a slight change in signal strength. It should be noted that by switching different amplifier paths, a fast adjustment of a fixed gain can be achieved, which is suitable for scenarios with low signal strength requirements but requiring fast response. The path switching design is relatively simple, the circuit is easy to implement, and is suitable for fields such as industrial automation that require high response speed. In addition, by adjusting the resistance value of the gain resistor, a more refined gain control can be achieved, which is suitable for precision measurement scenarios with high signal strength requirements, and can provide higher flexibility, which is suitable for scenarios that require accurate compensation of temperature changes or signal fluctuations, such as avionics or high-precision instruments. In this embodiment, the path switching method can quickly adjust the gain, which is used to compensate for small 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 deal with the slow drift 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.

[0017] In some further embodiments, the signal acquisition circuit includes a signal input and filtering unit, a gain control unit, a differential amplifier unit, and a filtering and reference adjustment unit; the SIN position signal and the COS position signal are collected as input signals to the signal input and filtering unit for filtering to obtain a filtered input signal, and the filtered input signal is transmitted to the gain control unit for gain adjustment to obtain a gain-adjusted signal input differential amplifier unit, and the differential amplifier unit performs filtering and reference adjustment on the gain-adjusted signal to output a stable SIN AD signal and COS_AD signal. It should be noted that the output signal (SIN and COS position signal) of the inductive angle sensor is easily affected by noise, electromagnetic interference and other environmental factors, and directly collecting and processing the original signal may result in a decrease in accuracy. The signal input and filtering unit effectively suppresses the 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 unit receives a pure input signal. This hierarchical filtering design can significantly improve the system's anti-noise ability to environmental interference. A wide temperature range or changes in the sensor installation environment may cause fluctuations in signal strength, affecting subsequent signal processing and output. The gain control unit dynamically adjusts the amplifier gain (such as switching amplifier paths or adjusting gain resistor values) to adapt to changes in input signal strength and compensate for signal attenuation or enhancement caused by environmental changes. Dynamic gain adjustment ensures that signal strength remains within an appropriate range in subsequent processing steps, avoiding nonlinear distortion or signal loss caused by excessive or weak signals.

[0018] In some further embodiments, the signal input and filtering unit includes a capacitor C61, which 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 a resistor R57, a resistor R59, a resistor R53, a resistor R56, an amplifier U27A, an amplifier U27B and an amplifier U28, one end of the resistor R57 and the resistor R59 is connected to the signal output end of the capacitor C61, the other end of the resistor R57 is connected to an input end of the amplifier U27B, the other end of the resistor R59 is connected to an input end of the amplifier U27A, the signal output end of the capacitor C61 is also directly connected to another input end of the amplifier U27A and another input end of the amplifier U27B, the output end of the amplifier U27A is connected to one end of the resistor R56, the output end of the amplifier U27B is connected to one end of the resistor R53, and the other ends of the resistor R56 and the resistor R53 are respectively connected to the two ends of the amplifier U28 The output end of the amplifier U28 outputs the SIN signal after gain adjustment and inputs it into the SIN signal differential amplifier unit for filtering and reference adjustment; the SIN signal differential amplifier unit includes a resistor R55, a resistor R22, a capacitor C58, a capacitor C17, an operational amplifier U26, a resistor R24, a resistor R52, a resistor R54, a capacitor C20 and a capacitor C60; one end of the resistor R55 is connected to the output end of the amplifier U28, one end of the resistor R22, and one end of the capacitor C17, and the resistor R55 is connected to the output end of the amplifier U28, one end of the resistor R22, and one end of the capacitor C17. The other end is connected to the inverting input of the operational amplifier U26 and one end of the capacitor C58; the other end of the resistor R22 and the other end of the capacitor C17 are connected to the output of the operational amplifier U26 and one end of the resistor R24, the other end of the capacitor C58 is connected to the positive input of the operational amplifier U26 and one end of the resistor R52, the other end of the resistor R52 is connected to the resistor R54 and one end of the capacitor C60, the other end of the resistor R54 is connected to the other end of the capacitor C60; the other end of the resistor R24 ​​is connected to one end of the capacitor C20, outputting a stable SIN AD signal, and the other end of the 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 the 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 the gain of different paths of the signal to be adjusted simultaneously. Amplifiers U27A and U27B perform preliminary amplification on 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 paths and outputs a gain-adjusted SIN signal. The final gain-adjusted signal is output from amplifier U28 and enters the SIN signal differential amplifier unit, thereby dynamically adjusting the signal gain, compensating for changes in the input signal strength, and ensuring that the signal amplitude meets the subsequent processing requirements. The gain-adjusted signal output by amplifier U28 is sent to the inverting input of differential amplifier U26 through resistor R55 to form a differential input. The non-inverting input is connected to the reference point through capacitor C58 to eliminate common-mode noise in the signal. The output of op amp U26 returns to the inverting input through the feedback network (R22 and C17) to form negative feedback and stabilize the output signal. The differentially amplified signal is low-pass filtered (C60 and R52, R54) to remove residual high-frequency interference. After the output signal is superimposed with the reference voltage (provided by R24 and C20), the final stable SIN AD signal is output. In this embodiment, the high-frequency noise and electromagnetic interference in the input signal can be effectively removed by the multi-stage filtering design of capacitor C61 and filtering network (such as C60 and R52, R54). The differential amplifier unit further enhances the anti-interference ability of the signal by eliminating common-mode interference. The gain control unit supports multi-channel signal adjustment (through amplifiers U27A, U27B and U28), and can dynamically adjust the signal gain to adapt to changes in input signal strength under different environments. This dynamic gain adjustment function can ensure the flexibility and robustness of the signal processing circuit. The differential amplifier U26 effectively eliminates 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 nonlinear 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, 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), providing a guarantee for high-precision angle measurement. The multi-stage filtering and dynamic gain adjustment design can effectively deal with the impact of temperature changes on 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 in a wide temperature range.

[0019] In some further embodiments, the signal input and filtering unit includes a capacitor C53, which 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 a resistor R45, a resistor R44, a resistor R48, a resistor R58, an amplifier U24B, an amplifier U24C and an amplifier U24A, one end of the resistor R45 and the resistor R44 are connected to the signal output end of the capacitor C53, the other end of the resistor R45 is connected to an input end of the amplifier U24C, the other end of the resistor R44 is connected to an input end of the amplifier U24B, the signal output end of the capacitor C53 is also directly connected to another input end of the amplifier U24B and another input end of the amplifier U24C, the output end of the amplifier U24B is connected to one end of the resistor R58, the output end of the amplifier U24C is connected to one end of the resistor R48, the other ends of the resistor R58 and the resistor R48 are connected to the two input ends of the amplifier U24A respectively, and the amplifier U The output end of 24A outputs the COS signal after gain adjustment, which is input to the COS signal differential amplifier unit for filtering and reference adjustment; the COS signal differential amplifier unit includes resistor R46, resistor R50, capacitor C54, capacitor C55, operational amplifier U25, resistor R25, resistor R49, resistor 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, and the other end of resistor R46 is connected to the inverting The other end of resistor R50 and the other end of capacitor C55 are connected to the output end of op amp U25 and one end of resistor R25, the other end of capacitor C54 is connected to the positive phase input end of op amp U25 and one end of resistor R49, the other end of resistor R49 is connected to resistor R47 and one end of capacitor C52, the other end of resistor R47 is connected to the other end of capacitor C52; the other end of resistor R25 is connected to one end of capacitor C21 to output a stable COS_AD signal, and the other end of capacitor C21 is grounded. It should be noted that this embodiment can be understood with reference to the description of the above embodiment, and this embodiment will not be repeated.

[0020] In some preferred embodiments, 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 changes, and the excitation signal after the square wave frequency changes 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. It should be noted that the LC resonant circuit is the core module for generating the excitation signal in the inductive angle sensor system, and its resonant 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 have a large drift due to temperature changes, resulting in a significant change in the output strength of the excitation signal. If the large change in signal strength is not compensated, the output signal of the sensor (SIN position signal and COS position signal) will be severely distorted, resulting in a decrease in measurement accuracy. In this embodiment, by adjusting the square wave frequency of the excitation signal, the frequency of the signal input to the LC resonant circuit is changed, so that the LC resonant circuit re-matches the resonance point, thereby restoring the output strength of the excitation signal. This method can compensate for large intensity changes from the source of signal generation and ensure the reliability of the output signal.

[0021] 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 the state according to the clock signal, and drives the LC resonance unit to generate a high-intensity excitation signal. It should be noted that in the inductive angle sensor, the intensity of the excitation signal is crucial to the amplitude and accuracy of the output signal. Under a wide temperature range (such as -55°C to 85°C), the signal strength may attenuate 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 to ensure that the frequency and duty cycle of the excitation signal are highly stable. The power switch unit converts the input clock signal into a high-frequency excitation signal that can drive the LC resonance unit, further improving the intensity of the excitation signal. The LC resonance unit converts the output signal of the power switch unit into a high-amplitude sinusoidal wave excitation signal through resonance amplification to ensure that the intensity of the excitation signal meets the system requirements. In addition, the resonant frequency of the LC resonance circuit depends on the inductance and capacitance parameters, and these parameters will drift with temperature changes, resulting in reduced resonance efficiency. In this embodiment, the excitation signal input unit dynamically adjusts the frequency of the input clock signal to match the resonant frequency of the LC resonant circuit, thereby maintaining the resonant efficiency. This frequency adaptive capability can effectively compensate for the LC parameter drift caused by temperature changes, ensuring that the excitation signal strength output by the resonant circuit is always stable.

[0022] 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, the clock signal CLK-2M is output to the power switch unit for processing the clock signal CLK-2M after being divided by the current limiting resistor R206 and the current limiting resistor R203, the power switch unit for processing the clock signal CLK-2M switches the state according to the clock signal CLK-2M, drives the first LC resonance unit to generate a high-intensity excitation signal HV0; the power switch unit for processing the clock signal CLK-2M includes a MOSFET switch tube Q201.1 and a MOSFET switch tube Q201.2; the clock signal CLK-2M is connected to one end of the current limiting resistor R206 and the current limiting resistor One end of the resistor R203 and the other end of the current limiting resistor R206 are connected to the power supply and the source of the MOSFET switch tube Q201.1, the other end of the current limiting resistor R203 is connected to the gate of the MOSFET switch tube Q201.1 and the MOSFET switch tube Q201.2, the drain of the MOSFET switch tube Q201.1 and the MOSFET switch tube Q201.2 is connected to the first LC resonance unit, and the source of the MOSFET switch tube 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 of the MOSFET switch tube Q201.1 and the MOSFET switch tube Q201.2, the other end of the inductor L201 is connected to one end of the capacitor C204, and the excitation signal HV 0 is output, and 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 effect of the current-limiting resistors R206 and R203 stabilizes the signal voltage input to the gate of the MOSFET of the power switch unit within a safe range, preventing excessive input signals from damaging the MOS tube. The current-limiting resistor R206 is also connected to the power supply to provide bias current for the power switch, so that the circuit can work normally. The divided clock signal CLK-2M controls the gate voltage of the MOSFET switch tubes Q201.1 and Q201.2, so that they are alternately turned on or off according to the frequency and duty cycle of the CLK-2M signal. When Q201.1 is turned on, the power current passes through the inductor L201 and the MOSFET switch tube Q201.1 to provide current for the LC resonant unit; when the MOSFET switch tube Q201.1 is turned off and the MOSFET switch tube Q201.2 is turned on, the LC circuit stores and releases energy to generate an oscillation signal. The alternating switching of the MOSFET switch tube Q201.1 and the MOSFET switch tube Q201.2 forms an excitation source of a high-frequency signal, providing a periodic drive for the LC resonant circuit.After receiving the high-frequency pulse signal output by the power switch unit, the LC resonant circuit composed of the inductor L201 and the capacitor C204 amplifies the amplitude of the signal through the resonance characteristics and converts the high-frequency pulse into a high-intensity sine wave signal. One end of the inductor L201 is connected to the drain of the MOSFET switch tube Q201.1 and the MOSFET switch tube Q201.2, and the other end is connected to the 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 HV0 is output. The output end of the LC resonant circuit generates a high-intensity sinusoidal excitation signal HV0 for use by the subsequent inductive angle sensor. The other end of the capacitor C204 is grounded to ensure that the reference base of the output signal is stable and prevent noise interference during the resonance process. In this embodiment, the clock signal after voltage division 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 sinusoidal excitation signal HV0 through resonance amplification. The output excitation signal has high strength and stability, which meets the requirements of the inductive angle sensor for the excitation signal. The current limiting resistors R206 and R203 adjust the input signal current to prevent the gate of the MOSFET from being out of control or damaged due to excessive input signals. The resonant characteristics 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 distortion of the sensor signal due to noise or interference. The MOSFET switch tube works in both the on and off states, with low switching loss and high energy utilization. The LC resonant unit amplifies the output signal through resonance, with low energy loss, reduces the power consumption of the circuit, and improves the energy conversion efficiency, so that the system can work efficiently and stably in a wide temperature range.

[0023] 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, and the clock signal CLK-2M 180 is output to the power switch unit for processing the clock signal CLK-2M 180 after voltage division by the current limiting resistors R204 and R205. The power switch unit for processing the clock signal CLK-2M 180 switches state according to the clock signal CLK-2M 180, and drives the second LC resonance unit to generate a high-intensity excitation signal HV 180; the power switch unit for processing the clock signal CLK-2M 180 includes a MOSFET switch tube Q202.1 and a MOSFET switch tube Q201.2; 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 of the MOSFET switch tube Q202.1, the other end of the current limiting resistor R205 is connected to the gate of the MOSFET switch tube Q202.1 and the MOSFET switch tube Q202.2, the drain of the MOSFET switch tube Q202.1 and the MOSFET switch tube Q202.2 is connected to the second LC resonance unit, and the source 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 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, and the excitation signal HV180 is output, and the other end of the capacitor C205 is grounded. It should be noted that this embodiment can be understood with reference to the description in the above embodiment, and this embodiment will not be repeated.

[0024] Embodiment 2 See also Figure 1-Figure 5 This embodiment provides a device for controlling the reliability of an inductive angle sensor within a full temperature range. The device for controlling the reliability of an inductive angle sensor within a full temperature range uses the method for controlling the reliability of an inductive angle sensor within a full temperature range described in any of the above embodiments to control the reliability of the inductive angle sensor within the full temperature range.

[0025] The above embodiments are only preferred specific implementation modes 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 any technician familiar with the technical field 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 based on 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 slight changes 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 larger changes 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 as claimed in claim 1, characterized in that: The small error range indicates that the signal strength variation of the signal strength of the amplified SIN position signal and the signal strength of the amplified COS position signal is within ±5%.

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: The large error range indicates that the signal strength of the amplified SIN position signal and the signal strength of the amplified COS position signal vary by more than ±20%.

6. The method for controlling the reliability of an inductive angle sensor in a full temperature range according to any one of claims 1 to 5, 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.

7. 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.

8. 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.

9. 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 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.

10. A control device for the reliability of an inductive angle sensor within a 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 9 to control the reliability of the inductive angle sensor within the full temperature range.

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