一种传感器的在线标定装置
By using a microcontroller and controllable switching circuits to achieve time-division multiplexing of high-voltage triggering, data transmission, and signal measurement on a single signal output line of the sensor, the problems of sensor calibration complexity and accuracy degradation are solved, online calibration is realized, production is simplified, and costs are reduced.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU SHENGBANG HYDRAULIC CO LTD
- Filing Date
- 2025-09-16
- Publication Date
- 2026-07-17
AI Technical Summary
Existing sensor calibration methods are complex, requiring communication lines to be reserved before potting, and online calibration cannot be performed after assembly, resulting in long production cycles, high costs, and reduced accuracy.
Employing a microcontroller and controllable switching circuit, the system achieves time-division multiplexing of high-voltage triggering, data transmission, and signal measurement through a single signal output line of the sensor, providing online calibration functionality.
It simplifies the production process, shortens the production cycle, reduces costs, and enables accuracy maintenance after the sensor is fully assembled, facilitating online calibration.
Smart Images
Figure CN224517816U_ABST
Abstract
Claims
1. An online calibration device for a sensor, used for online calibration of a three-wire sensor with a single signal output line, characterized in that, include: A test interface connected to the signal output line of the sensor; A microcontroller (MCU); a mode switching circuit for generating mode switching command signals; A data communication circuit for exchanging data with the sensor; a controllable switch; The common terminal of the controllable switch is connected to the test interface, which is provided with at least three selection terminals. The three selection terminals are respectively connected to the output terminal of the mode switching circuit, the transmitting terminal of the data communication circuit, and the receiving terminal of the data communication circuit. The microcontroller is configured to control the controllable switch to switch between at least three selection terminals to selectively output the mode switching command signal, send calibration data, or receive feedback data from the sensor on the test interface.
2. The apparatus for online calibration of a sensor according to claim 1, wherein: The mode switching command signal is a preset high voltage signal HV that is higher than the highest voltage on the signal output line when the sensor is working normally. This high voltage signal is used to trigger the sensor to enter the calibration mode.
3. The apparatus for online calibration of a sensor according to claim 1, wherein: The data communication circuit is the universal asynchronous transceiver (UART) module built into the microcontroller, with the transmitting end being the TXD pin of the UART and the receiving end being the RXD pin of the UART.
4. The apparatus for online calibration of a sensor according to claim 1, wherein: The controllable switch is further provided with a fourth selection terminal, which is connected to the analog-to-digital converter (ADC) input pin of the microcontroller; the microcontroller is also configured to: in test mode, control the controllable switch to connect the common terminal to the fourth selection terminal to measure the normal analog output signal of the sensor.
5. An apparatus for online calibration of a sensor according to claim 4, characterized in that: The controllable switch is a multi-channel analog switch AO-1 controlled by the microcontroller through its I / O port.
6. The apparatus for online calibration of a sensor according to claim 1, wherein: The device also includes an external interface for communicating with an external computer PC; the microcontroller receives control commands from the computer through the external interface and uploads data from the calibration process to it.
7. An apparatus for online calibration of a sensor according to claim 6, characterized in that: The external interface is a Universal Serial Bus (USB) interface.