CN-122015626-A - Performance detection device and detection method for inductive height sensor

CN122015626ACN 122015626 ACN122015626 ACN 122015626ACN-122015626-A

Abstract

The invention relates to a performance detection device and a performance detection method for an inductive height sensor, wherein the performance detection device comprises an upper computer, an MCU control unit, a servo motor, a servo driver, an angle feedback encoder, an inductive signal acquisition unit, a coil resistance measurement unit and a sensor temperature acquisition unit, wherein the upper computer is used for issuing a control instruction and receiving and processing feedback signals, the MCU control unit is used for sending the control instruction to the servo driver, receiving and integrating feedback signals and feeding back the feedback signals to the upper computer, the servo driver is used for driving the servo motor to act according to the control instruction, and the rotating end of the servo motor is used for installing a sensor to be detected. The multi-angle automatic and accurate adjustment of the height sensor is realized through the closed-loop control of the servo motor, the gesture change in the actual working condition is effectively simulated, and meanwhile, a temperature compensation mechanism is introduced to carry out secondary correction on the drift caused by self-heating and the temperature drift caused by the ambient temperature, so that the accuracy of performance evaluation is remarkably improved.

Inventors

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

Assignees

浙江科力车辆控制系统有限公司

Dates

Publication Date: 20260512
Application Date: 20260203

Claims (8)

1. The performance detection device for the inductive height sensor is characterized by comprising an upper computer, an MCU control unit, a servo motor, a servo driver, an angle feedback encoder, an inductive signal acquisition unit, a coil resistance measurement unit and a sensor temperature acquisition unit; the upper computer is used for issuing a control instruction and receiving and processing signals fed back by the MCU control unit; The MCU control unit is used for sending a control instruction issued by the upper computer to the servo driver, receiving and integrating signals fed back from the angle feedback encoder, the inductance signal acquisition unit, the coil resistance measurement unit and the sensor temperature acquisition unit, and feeding back the integrated signals to the upper computer; the servo driver is used for driving the servo motor to act according to the control instruction; the rotating end of the servo motor is used for installing an inductive height sensor to be detected; the angle feedback encoder is used for monitoring the actual rotation angle of the servo motor and feeding back the actual rotation angle; the inductance signal acquisition unit is used for acquiring inductance signals of the inductance type height sensor and feeding back the inductance signals; the coil resistance measuring unit is used for measuring the coil resistance value of the inductive height sensor and feeding back the coil resistance value; the sensor temperature acquisition unit is used for acquiring the shell temperature of the inductive height sensor and feeding back the shell temperature.
2. The performance detection device for an inductive height sensor according to claim 1, comprising an ambient temperature acquisition unit for acquiring and detecting the temperature of the environment and feeding back to the host computer through the MCU control unit.
3. The performance detecting device for an inductive altitude sensor of claim 2, wherein the upper computer comprises a display interface for displaying contents including at least an ambient temperature, an inductive altitude sensor temperature, a coil resistance value, a current angle corresponding inductance signal graph, a curve delete and restore button, a pass indicator, a CAN message and an operation prompt.
4. A performance detection method for an inductive height sensor based on the device of any one of claims 1 to 3, comprising the steps of: S1, setting a target test angle sequence of an inductive height sensor to be tested through an upper computer; S2, controlling the servo motor to sequentially rotate to each target test angle, and acquiring a corresponding actual rotation angle through an angle feedback encoder; S3, synchronously collecting an original inductance value, a coil resistance value, an ambient temperature and an inductive height sensor shell temperature of the inductive height sensor to be detected under each actual rotation angle; s4, calculating the actual temperature of the coil based on the resistance value of the coil, and obtaining the deviation temperature between the actual temperature of the coil and the temperature of the shell of the inductive altitude sensor; if the deviation temperature is greater than a preset threshold value, the upper computer prompts the fault of the inductance type height sensor to be detected; If the deviation temperature is not greater than a preset threshold value, obtaining a first compensation value according to a pre-trained coil actual temperature-inductance compensation quantity relation model; s5, obtaining a second compensation value according to a pre-trained environment temperature-inductance compensation quantity relation model based on the environment temperature, and obtaining a final inductance value=an original inductance value+a first compensation value+a second compensation value; and S6, correlating the final inductance value corresponding to each angle with the actual rotation angle, generating an inductance-angle performance curve, and judging whether the performance of the sensor meets the standard according to a preset qualification standard.
5. The performance detecting apparatus for an inductive altitude sensor of claim 4, wherein the calculation formula of the actual temperature of the coil is as follows: ; In the formula, In order to actually measure the resistance value of the coil, As the actual temperature value of the coil, Is at the standard temperature of the water-based paint, The resistance value of the coil at the standard temperature is shown, and alpha is the resistance temperature coefficient of the coil conductor material.
6. The performance testing apparatus for an inductive altitude sensor of claim 4, wherein the coil actual temperature-inductance compensation quantity relationship model employs a table look-up model.
7. The performance testing apparatus for an inductive altitude sensor of claim 4, wherein the ambient temperature-inductance compensation quantity relationship model employs a table look-up model.
8. The performance detecting apparatus for an inductive altitude sensor of claim 4, wherein in step S3, after the servo motor rotates to the target angle, the data acquisition is performed after waiting for a preset system stabilization time.

Description

Performance detection device and detection method for inductive height sensor Technical Field The invention belongs to the technical field of sensor performance detection devices, and particularly relates to a performance detection device and a detection method for an inductive height sensor. Background The inductive height sensor is used as a non-contact displacement detection device, and has the advantages of firm structure, high response speed, strong anti-pollution capability and the like, and is widely applied to the fields of automobile suspension systems, numerical control machine tools, industrial robots, precise assembly and the like, and is used for monitoring the relative distance (namely the height) between a metal target object and the sensor in real time. The working principle is based on electromagnetic induction, when a metal target approaches a sensor coil, the change of the inductance of the coil is caused, and the change is converted into voltage or frequency signal output through a signal conditioning circuit, so that the height information is reflected. However, the output performance of an inductive altitude sensor is susceptible to significant environmental temperature variations, mainly because the inductive coil inside the sensor is typically wound with copper wire, while the resistivity of copper has a significant positive temperature coefficient (about 0.00393/° C), when the ambient temperature increases or the sensor itself heats up due to excitation current, the coil dc resistance increases, resulting in a decrease in the coil quality factor (Q value), a shift in the resonant frequency, and thus a drift in the amplitude or phase of the output signal, so that the performance of the altitude sensor in a very warm environment cannot be normally evaluated. In addition, the output characteristics of inductive height sensors are highly sensitive to the relative attitude (especially the angle of rotation) between them and the target surface. In typical working conditions such as over-bending and suspension movement of an automobile, the working angle of the sensor is dynamically changed, the sensitivity and linearity of the sensor are also changed, the existing detection equipment is mainly provided with a manual adjustment or a simple rotating table for angle setting, high-precision closed-loop control is lacked, repeated positioning errors are large, and synchronous data acquisition under multiple angles cannot be realized. Based on this, the present application is hereby proposed. Disclosure of Invention The invention aims to provide a performance detection device and a detection method for an inductive altitude sensor, which are used for accurately evaluating the real performance of the sensor under the working conditions of multiple postures in a full temperature range. In order to achieve the above purpose, the technical scheme of the invention is as follows: The performance detection device for the inductive height sensor comprises an upper computer, an MCU control unit, a servo motor, a servo driver, an angle feedback encoder, an inductance signal acquisition unit, a coil resistance measurement unit and a sensor temperature acquisition unit; the upper computer is used for issuing a control instruction and receiving and processing signals fed back by the MCU control unit; The MCU control unit is used for sending a control instruction issued by the upper computer to the servo driver, receiving and integrating signals fed back from the angle feedback encoder, the inductance signal acquisition unit, the coil resistance measurement unit and the sensor temperature acquisition unit, and feeding back the integrated signals to the upper computer; the servo driver is used for driving the servo motor to act according to the control instruction; the rotating end of the servo motor is used for installing an inductive height sensor to be detected; the angle feedback encoder is used for monitoring the actual rotation angle of the servo motor and feeding back the actual rotation angle; the inductance signal acquisition unit is used for acquiring inductance signals of the inductance type height sensor and feeding back the inductance signals; the coil resistance measuring unit is used for measuring the coil resistance value of the inductive height sensor and feeding back the coil resistance value; the sensor temperature acquisition unit is used for acquiring the shell temperature of the inductive height sensor and feeding back the shell temperature. Further, the environment temperature detection device comprises an environment temperature acquisition unit, wherein the environment temperature acquisition unit is used for acquiring and detecting the temperature of the environment and feeding the temperature back to the upper computer through the MCU control unit. Further, the upper computer comprises a display interface, and the content for displaying at least comprises an ambient temperature, an