Water temperature control method of cold and hot water double-inlet washing machine

Abstract

The invention relates to a water temperature control method of a cold and hot water double-inlet washing machine. The water temperature control method is characterized in that a cold water inlet valve and a hot water inlet valve are arranged and are constant-flow water inlet valves, wherein a temperature sensor is arranged in a washing bucket; a controller is used for setting fixed total water inlet time every time of the cold water inlet valve and the hot water inlet valve; the controller calculates a cold water inlet temperature and a hot water inlet temperature according to water temperatures in the washing bucket of the washing machine before and after adding water; then the controller calculates a ratio of desired inlet cold water to desired inlet hot water by using the known cold water inlet temperature, the hot water inlet temperature and the water temperatures in the washing bucket, and converts the ratio into a turn-on time ratio of the cold water inlet valve to the hot water inlet valve every time; and the controller controls the turn-on time of the cold water inlet valve and the hot water inlet valve so as to control the water temperature. According to the water temperature control method of a cold and hot water double-inlet washing machine, the accuracy of water temperature control of the cold and hot water double-inlet washing machine is improved, the washing degree of clothes is increased, the energy consumption is saved, and the washing time is shortened simultaneously.

Description

technical field [0001] The invention relates to a washing machine, in particular to a water temperature control method for a washing machine with dual inlets of cold and hot water. Background technique [0002] Washing machines, especially drum washing machines, are generally equipped with heating devices in order to make clothes more clean. The washing water temperature of the washing machine is related to the washing degree of the clothes and the energy consumption. If the washing temperature is too low, the washing degree of the clothes will be reduced, and if the washing temperature is too high, it will not only help to wash the clothes, but also damage the clothes and waste energy. Reasonable water temperature control can make clothes wash cleaner and consume less energy on the premise of cleaner clothes. Therefore, this type of washing machine generally has a temperature sensor for measuring water temperature, such as figure 1 shown. The water temperature control of ...

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Problems solved by technology

[0016] The current water temperature control method adopted by the hot and cold dual-inlet washing machine must set the upper and lower limits of the target temperature, the water temperature must fluctuate between the upper and lower limits, and there must be an error in the water temperature control

And the upper and lower limits should not be set too narrow, otherwise the cold and hot water inlet valves will open and close irregularly and frequently

In addition, there is a certain hysteresis from the water inlet valve to the water temperature detection to the feedback control of the water inlet valve opening and closing, which further increases the uncertainty of the water temperature control

[0017] In addition to the inaccurate water temperature control, in case the user connects the cold and hot water inlets wrongly in the current hot and cold dual-inlet washing machine, that is, the cold water pipe is connected to the hot water inlet valve, and the hot water pipe is connected to the cold water inlet. On the valve, the washing machine will only enter hot water when washing clothes, and only hot water will enter when rinsing. Once this happens, it will damage the washed clothes

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