Signal detection circuit and frequency detection method of water diversion valve of dishwasher

Abstract

The invention relates to a signal detection circuit and a frequency detection method of a water diversion valve of a dishwasher. The detection circuit includes a water diversion valve, and is characterized in that it also includes a single-chip microcomputer and a detection circuit, wherein the detection circuit receives the output signal of the water diversion valve. After the signal is processed by the detection circuit, it is transmitted to the single-chip microcomputer, and the single-chip microcomputer judges the frequency of the water diversion valve through the detection method. The steps of the frequency detection method include A conversion filtering stage, B cycle start signal judgment, C cycle judgment and D water diversion valve fault judgment. It has the advantages of a wide selection range of single-chip microcomputers, relatively simple detection-related hardware, easy maintenance, and easy transplantation of software design algorithms.

Description

technical field [0001] The invention belongs to the field of dishwasher alternate washing control, in particular to a signal detection circuit and frequency detection method of a dishwasher water diversion valve, belonging to the signal detection circuit and frequency of a dishwasher water diversion valve of a dishwasher Detection method improvement technology. Background technique [0002] Dishwashers wash the tableware in the upper basket and the tableware in the lower basket alternately, which is an effective way to save water and energy consumption while meeting the requirements of the cleaning rate. The positioning control of the water diversion valve determines whether the upper spray arm and the lower spray arm are opened and the amount of washing water sprayed, so whether the positioning point of the water diversion valve is accurate or not directly determines the washing performance of the alternate washing method. [0003] At present, the dishwashers in the prior ...

AI Technical Summary

Problems solved by technology

However, the existing water diversion valve signal detection method may cause misjudgment of the cycle starting point due to the difference in the initial position of the water diversion valve, and the water diversion valve model has different frequencies such as 50Hz and 60Hz, and the software needs to be processed differently. The accuracy of software control and software compatibility are greatly limited

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