Turbidity detection system with calibration function, detection method and dish washing machine

Abstract

The invention discloses a turbidity detection system with the calibration function and belongs to the technical field of washing. The detection system is designed in order to solve the problem of turbidity signal detection deviation, caused by pollutants, of a turbidity sensor. The detection system comprises a control unit, the turbidity sensor and a calibration unit, wherein the turbidity sensor and the calibration unit are connected with the control unit. The control unit presets the turbidity voltage signal standard value and the calibration deviation value range of clear water, compares a received voltage signal detected value, detected by the turbidity sensor, of washing water with the turbidity voltage signal standard value, and controls the calibration unit to started or stopped according to whether the difference value or the specific value of the voltage signal detected value and the turbidity voltage signal standard value is within the calibration deviation range or not. The calibration unit is used for adjusting the voltage signal detected value to reach or be close to the turbidity voltage signal standard value. The invention further discloses a detection method to which the detection program is applied and a dish washing machine. The calibration unit can adjust the voltage signal detected value, detected by the turbidity sensor, of the washing water to reach or be close to the turbidity voltage signal standard value, and then automatic calibration of the turbidity sensor is achieved.

Description

technical field [0001] The invention belongs to the technical field of washing, and relates to a turbidity detection system with a calibration function, a detection method and a dishwasher applying the detection method. Background technique [0002] Since the turbidity sensor is in the middle and lower part of the sink, after washing the dishwasher for a period of time, if the water hardness is high, some scale will be generated on the surface of the turbidity sensor, and it may also be caused by some sticky substances blocking the surface of the turbidity sensor. Pollution, the signal transmitted by the surface polluted turbidity sensor to the main control board will deviate from the original set signal, so the washing program judged by the main control board will also deviate. [0003] Specifically, the voltage value fed back to the main control board by the turbidity sensor will be inaccurate. For example: under normal circumstances, the voltage preset value of clean wat...

AI Technical Summary

Problems solved by technology

If there is no scale on the surface of the turbidity sensor, the voltage difference before and after washing is 4.7-3=1.7V. If there is scale on the surface of the turbidity sensor, the voltage difference before and after washing may become about 3-1.5=1.5V, so the same In the washing state, if there are two different differences, the main control board will adopt different washing procedures according to the different differences, which will cause the dishwasher to judge inaccurately the cleanliness of the washing water during the washing process, so there will be washing Unclean condition causing inconvenience to people

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