Method and device for measuring carbon dioxide refrigerant based on electrostatic capacity

Abstract

The invention provides a method for measuring a carbon dioxide refrigerant based on electrostatic capacity. The method comprises the following steps of: detecting a detection point of a transmission pipeline through motion to obtain existence information of a plurality of detection node links and existence information obtained by a plurality of calibration periods; determining existence activity of each detection node link according to existence information of each detection point link in each calibration period; identifying a static node based on presence activity of a plurality of detection node links in a calibration window, wherein the calibration window comprising a subset of a plurality of calibration cycles; and updating the detection pass tube to use at least one of the identified static nodes for a detection node for motion detection. According to the invention, the state of the detection node link is adopted, activation of the detection element for detecting the transmission pipeline is triggered based on the state of each detection node, and meanwhile, the detection nodes are detected by the detection element, so that the carbon dioxide refrigerant can be accurately detected in the running process.

Description

technical field [0001] The invention relates to the technical field of vehicle air conditioners, in particular to a method for measuring carbon dioxide refrigerant based on electrostatic capacity. Background technique [0002] The capacitance-based sensing technology is a technology for detecting an external input, a change in an external state, the presence of a substance, and the like using a change in capacitance. Capacitive sensing technology is used in a very wide range of fields. [0003] Such as CN1197188A prior art discloses a kind of refrigerant compressor, due to energy saving requirements, for such refrigerant compressors loaded into air conditioners or refrigerators, it is strongly required to improve the efficiency of the compressor. While improving the internal efficiency, the efficiency of the motor should also be improved. To improve the efficiency of the motor, the main measure is to increase the thickness of the stator and rotor or change the winding spec...

AI Technical Summary

Problems solved by technology

As a result, the time required for capacitance detection increases

On the other hand, when the time required for capacitance detection increases, the influence of low-frequency noise superimposed on the power supply (first and second potential sources) for capacitance detection and the increase in the fluctuation range of the power supply itself becomes significant, and the detection accuracy On the contrary, it is also possible to decrease

That is, in order to improve the detection accuracy, the number of switch operations is increased, but this may lead to a decrease in detection accuracy.

[0005] In order to solve the common problems in the field of poor detection accuracy, large error offset, unreasonable corrective measures and low automatic degree, etc., the present invention is made

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