Dishwasher and controlling method thereof
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Solution Overview
Problem
Conventional dishwashers face inefficiencies in detecting heater errors, leading to unnecessary power consumption and delayed detection of operational states, as the heater must remain submerged in water, causing energy inefficiencies and prolonged electric power usage.
Innovation Solution
A dishwasher controlling method that includes a heater sensing step where the wash water circulation is stopped to rapidly determine the operational state of the heater by comparing temperatures before and after operation, allowing for prompt power cutoff when temperature differences are outside a preset range, thereby preventing unnecessary power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the heater is operated with wash water circulation to ensure heater submersion and safety, then the heater can be protected from damage, but unnecessary power consumption occurs and temperature detection is delayed
Solution Approach 1:
The system performs preliminary submersion of the heater in wash water before operation begins, ensuring the heater is properly positioned and protected. During temperature detection phases, the circulation is temporarily stopped but the heater remains submerged, allowing rapid temperature sensing without continuous circulation power consumption.
Solution Approach 2:
The wash water circulation is operated periodically rather than continuously - it runs during heater operation to maintain submersion, stops during temperature detection to save energy, and resumes when needed. This periodic operation pattern reduces overall power consumption while maintaining heater protection and detection accuracy.
2Reliability
If wash water circulation is maintained during heater operation, then the heater remains submerged and protected, but the temperature detection time is extended and energy efficiency decreases
Solution Approach 1:
The heater is preliminarily submerged in wash water before operation starts, ensuring proper positioning. During temperature detection, the circulation is temporarily stopped while the heater remains in the wash water, allowing rapid temperature sensing without the interference of circulating water, thus reducing detection time.
Solution Approach 2:
The system dynamically adjusts the circulation state based on operational phase - circulation is active during heater operation to maintain submersion, but is stopped during temperature detection phases to enable rapid sensing. This dynamic control optimizes both reliability and detection speed.
3Reliability
If the heater is operated without stopping circulation for continuous protection, then heater safety is maintained, but unreasonable energy efficiency is achieved due to prolonged power supply
Solution Approach 1:
The wash water circulation operates periodically rather than continuously - it runs during heater operation to maintain submersion and safety, stops during temperature detection to conserve energy, and resumes when needed. This periodic pattern maintains heater safety while eliminating unreasonable energy losses from continuous circulation.
Solution Approach 2:
The system uses temperature detection feedback to control circulation - when temperature detection is complete and the heater is confirmed to be operating correctly, the circulation can be stopped or reduced, reducing energy consumption. The feedback mechanism ensures heater safety is maintained while optimizing energy efficiency.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables rapid detection of the heater's operational state and prevents unnecessary power consumption by cutting off power when temperature differences are outside a preset range, enhancing energy efficiency.
Implementation Method 1
a heater provided in a path for wash water (generally, under the washing tub or in the sump) to heat the wash water
Implementation Method 2
the presence of the error in the heater is detected by measuring the temperature of the water heated by the heater
Data Source
AI summary
Disclosed a controlling method of a dishwasher comprising a water supply step for supplying wash water, a preliminary washing step for injecting the wash water to one or more dishes, a main washing step for injecting the wash water mixed with washing liquid to the dishes, a rinsing step for injecting the wash water to the dishes, and a heating step for heating the wash water in one or more of the preliminary washing step, the main washing step and the rinsing step, wherein a heater sensing step for determining an operational state of a heater heating the wash water is performed in the heating step in a state where the circulation of wash water is stopped.