CN-121977424-A - High-precision acquisition method and device for inductive sensor signals

CN121977424ACN 121977424 ACN121977424 ACN 121977424ACN-121977424-A

Abstract

The invention provides a high-precision acquisition method and device for inductive sensor signals, which relate to the technical field of inductive sensor signal acquisition, and the invention precisely acquires feedback response caused by inductance change of an inductive sensor of a commercial vehicle by applying a stable excitation signal on a coil of the inductive sensor, converts the response into a high-resolution PWM signal through a signal conditioning circuit, and realizes initial calculation of height information by utilizing the relation between pulse width and inductance quantity; the inductance signal is converted into the PWM pulse width signal, the micro-processing unit can be utilized to directly capture the pulse width change, and the problems of cost and stability caused by a complex analog circuit are avoided. Meanwhile, the measured temperature data are combined, a preset temperature compensation algorithm is adopted to dynamically correct the initial height, and measurement deviation caused by environmental temperature fluctuation is effectively restrained, so that the stability and the accuracy of the system under complex working conditions are improved. The invention ensures the measurement accuracy and reduces the cost at the same time, and improves the market competitiveness and the popularity of the ECAS system.

Inventors

CHEN YING
DONG XIANG
FENG WEI
PAN YONGBO
WU JIE
ZHENG CHEN
ZHOU TIANXIANG

Assignees

浙江科力车辆控制系统有限公司

Dates

Publication Date: 20260505
Application Date: 20251231

Claims (9)

1. The high-precision acquisition method for the inductive sensor signal is characterized by comprising the following steps of: s1, generating and outputting a stable excitation signal to a coil of an inductive height sensor; S2, collecting a coil inductance change value generated by the coil under the action of the excitation signal, and obtaining an excitation feedback signal; S3, processing the excitation feedback signal, converting the excitation feedback signal into a pulse width modulation signal, and analyzing initial height information by calculating the change of the pulse width modulation signal, wherein the parameter change of the pulse width modulation signal is related to the inductance value change of the coil; S4, acquiring temperature data, including temperature data of the induction coil; s5, compensating and correcting the analyzed initial height information based on the temperature data to obtain compensated height information.
2. The method for high-precision acquisition of inductive sensor signals according to claim 1, wherein in step S2, the excitation feedback signal is processed and converted into a pulse width modulation signal, and specifically comprises: step-down processing is carried out on the excitation feedback signal; and inputting the signal subjected to the voltage reduction into a Schmitt circuit, and converting the coil inductance change value into the pulse width modulation signal through the Schmitt circuit.
3. The method for high-precision acquisition of inductive sensor signals according to claim 1, wherein in step S4, temperature data is acquired, including inductor temperature data and circuit board operating temperature data.
4. The method for high-precision acquisition of inductive sensor signals according to claim 1, wherein in step S5, compensation correction is performed on the analyzed initial height information based on temperature data, and specifically comprises: comparing the acquired temperature data with a preset reference temperature to acquire a temperature difference value; Establishing a relation between a temperature difference value and a compensation inductance value, and constructing a temperature-inductance drift compensation model; Determining an inductance compensation amount based on the temperature-inductance drift compensation model according to the temperature difference value; And determining a height compensation amount through the inductance compensation amount based on the mapping relation between the inductance variation amount and the height variation, and superposing the height compensation amount on the initial height information to obtain the compensated height information.
5. The method for high-precision acquisition of inductive sensor signals according to claim 1, wherein in step S5, compensation correction is performed on the analyzed initial height information based on temperature data, specifically comprising.
6. A high-precision acquisition device for inductive sensor signals, suitable for use in the method according to any one of claims 1 to 5, comprising: the excitation signal generation module is used for generating and outputting a stable excitation signal to the coil of the inductive altitude sensor; the signal acquisition module is used for acquiring a coil inductance change value generated by the coil under the action of the excitation signal to obtain an excitation feedback signal, The signal modulation module is used for processing the excitation feedback signal and converting the excitation feedback signal into a pulse width modulation signal, and analyzing initial height information by calculating the change of the pulse width modulation signal; The temperature acquisition module is used for acquiring temperature data, including temperature data of the induction coil; And the height correction module is used for compensating and correcting the analyzed initial height information based on the temperature data so as to obtain the compensated height information.
7. The inductive sensor signal high-precision acquisition device according to claim 6, wherein the excitation signal generation module adopts an intelligent high-side driving chip, and generates and outputs the stable excitation signal based on the control of the intelligent high-side driving chip in the micro-processing unit.
8. The inductive sensor signal high accuracy gathering device as recited in claim 6, wherein said signal conditioning module comprises: the step-down circuit is used for carrying out step-down processing on the excitation feedback signal; and the Schmitt circuit is coupled to the output end of the voltage reduction circuit and is configured to shape and convert the reduced signal into the pulse width modulation signal.
9. An electronically controlled air suspension system comprising an inductive sensor signal high accuracy acquisition device according to any one of claims 6 to 8.

Description

High-precision acquisition method and device for inductive sensor signals Technical Field The invention relates to the technical field of signal acquisition of inductive sensors, in particular to a high-precision signal acquisition method and device of an inductive sensor. Background With the widespread use of electronically controlled air suspension systems (ECAS) in commercial vehicles, they offer significant advantages in terms of improving vehicle fuel economy, passability, and load adjustment flexibility. However, the overall cost of the ECAS system in the domestic market is high, so that the popularization of the technology in commercial vehicles, especially new energy heavy trucks, is limited. The vehicle inductive height sensor is used as a key sensing component of the ECAS system, and the signal acquisition precision and the cost control of the vehicle inductive height sensor are main technical bottlenecks for restricting the popularization of the ECAS system. The existing signal acquisition scheme of the inductive sensor for the vehicle depends on complex peripheral circuits or special chips, is high in cost, and is easy to drift and distort in a temperature change environment, so that accuracy of vehicle body posture judgment and driving safety are affected. Disclosure of Invention The invention aims to solve the technical problems that an existing automobile inductive sensor signal acquisition scheme is high in acquisition circuit complexity and high in signal influence by temperature, and the invention aims to provide an inductive sensor signal high-precision acquisition method and device. In order to achieve the above purpose, the present invention provides the following technical solutions: The invention provides a high-precision acquisition method of an inductive sensor signal, which comprises the steps of S1, generating and outputting a stable excitation signal to a coil of the inductive sensor, S2, acquiring a coil inductance change value generated by the coil under the action of the excitation signal to obtain an excitation feedback signal, S3, processing the excitation feedback signal and converting the excitation feedback signal into a pulse width modulation signal, analyzing initial height information by calculating the change of the pulse width modulation signal, wherein the parameter change of the pulse width modulation signal is related to the inductance value change of the coil, S4, acquiring temperature data comprising the temperature data of the inductive coil, and S5, compensating and correcting the analyzed initial height information based on the temperature data to obtain compensated height information. According to the scheme, a stable excitation signal is applied to a coil of an inductive altitude sensor of a commercial vehicle, feedback response caused by inductance change is accurately obtained, the response is converted into a high-resolution PWM signal through a signal conditioning circuit, initial calculation of altitude information is achieved by utilizing the relation between pulse width and inductance, the inductance signal is converted into a PWM pulse width signal, the pulse width change can be directly captured by a micro-processing unit, and the problems of cost and stability caused by a complex analog circuit are avoided. Meanwhile, the measured temperature data are combined, a preset temperature compensation algorithm is adopted to dynamically correct the initial height, and measurement deviation caused by environmental temperature fluctuation is effectively restrained, so that the stability and the accuracy of the system under complex working conditions are improved. The invention provides a preferable scheme in the first aspect, and in the step S2, the excitation feedback signal is processed and converted into a pulse width modulation signal, and the method specifically comprises the steps of performing step-down processing on the excitation feedback signal, inputting the step-down signal into a Schmitt circuit, and converting a coil inductance change value into the pulse width modulation signal through the Schmitt circuit. According to the preferred scheme, signal jitter is effectively eliminated through the hysteresis characteristic of the Schmitt trigger circuit, clear and stable pulse width modulation signal edges are ensured, and the reliability and anti-interference capability of signal conversion are improved. The present invention provides a preferred embodiment in the first aspect, wherein in step S4, temperature data is collected, including inductor temperature data and circuit board operating temperature data. According to the optimal scheme, the temperature parameters of the inductance coil and the circuit board are synchronously acquired, so that the accuracy of temperature compensation and the environmental adaptability of the system are further improved. The invention provides a preferred scheme in the first aspect, and in the step S5, compensa