A sensor sampling device, method, terminal, and medium based on a constant current source

CN115599153BActive Publication Date: 2026-05-26SINO TRUK JINAN POWER CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
SINO TRUK JINAN POWER CO LTD
Filing Date
2022-09-13
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing automotive sensors suffer from inaccurate detection due to constant current source delay, especially when the circuit impedance is long, leading to a decrease in the accuracy of liquid level detection.

Method used

Design a sensor sampling device based on a constant current source, including a control module, a sensor sensing element and an external power supply. By setting a first switch and an internal pre-drive circuit, ensure that the constant current source circuit can stably output a constant current after power-on, thereby improving the sampling accuracy of the sensor sensing element.

Benefits of technology

By providing a stable, constant current output, the detection accuracy of the sensor's sensing element is improved, and the impact of detection time delay on the results is reduced.

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Abstract

This invention relates to a sensor sampling device, method, terminal, and medium based on a constant current source, belonging to the field of vehicle sensor technology. It includes a control module, a sensor sensing element, and an external power supply. The control module comprises a main controller, a first-stage step-down circuit, a constant current source circuit, an internal pre-drive circuit, a first switch, a second switch, and a sampling circuit. By setting the first switch and the internal pre-drive circuit, this invention ensures that after power-on, the constant current source circuit reaches a constant output. Then, the first switch is opened, and the second switch is closed, allowing the constant current source circuit to provide a stable, constant current output to the sensor sensing element, thereby improving the sampling accuracy of the sensor sensing element.
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