Dishwasher Rack Spray Control for Mixed-Load Washing
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Solution Overview
Problem
Conventional dishwashers are inefficient when washing dishes of varying sizes and loads in a single compartment, as they often require longer cycles and increased power consumption, particularly when mixing large and small dishes.
Innovation Solution
A dishwasher control method that alternates the spraying of steam and water between upper and lower racks using upper and lower spraying arms, with adjustable water volumes and temperatures, and selective operation of spraying arms based on washing loads, to optimize washing efficiency and reduce cycle time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional dishwashers wash both large and small dishes in a single compartment using the same washing cycle, then the dishwasher can handle mixed loads, but washing efficiency decreases and power consumption increases
Solution Approach 1:
The washing compartment is divided into upper and lower racks with separate spraying arms. The control method segments the washing process by allowing independent operation of upper and lower spraying arms, enabling different washing parameters to be applied to different racks simultaneously. This segmentation resolves the contradiction by maintaining versatility for mixed loads while improving efficiency through differentiated washing zones.
Solution Approach 2:
The system dynamically adjusts the operation of spraying arms based on the detected washing load. The control method enables dynamic switching between different spraying patterns, water temperatures, and cycle durations for upper and lower racks independently. This dynamic adaptability allows the system to optimize washing efficiency for each rack's specific load while maintaining the ability to handle mixed loads.
2Ease of operation
If conventional dishwashers use a single washing cycle for all dishes, then the system is simple to operate, but wash time increases and power consumption increases
Solution Approach 1:
The control method provides dynamic washing cycle adjustment based on detected load characteristics. Users simply select a general washing mode, and the system automatically dynamically adjusts the washing parameters for upper and lower racks independently, optimizing wash time without requiring user complexity. This resolves the contradiction by maintaining ease of operation while reducing wash time through intelligent dynamic control.
Solution Approach 2:
The system performs self-diagnosis and self-adjustment of washing parameters based on the detected load distribution. The control method automatically determines the optimal washing cycle for each rack without user intervention, enabling the system to serve itself in optimizing the washing process. This self-service capability reduces wash time while keeping the user interface simple.
3Device complexity
If conventional dishwashers apply the same water spraying to upper and lower racks, then the system structure is simple, but washing efficiency decreases for dishes with varying loads
Solution Approach 1:
The spraying system is segmented into independent upper and lower spraying arms with separate control. This segmentation allows different water flow rates, temperatures, and spraying patterns to be applied to upper and lower racks independently. The moderate increase in structural complexity enables significant improvements in washing efficiency for dishes with varying loads.
Solution Approach 2:
The system applies different washing qualities (water temperature, pressure, flow rate) to different local zones (upper and lower racks) based on the specific loading conditions. The control method enables local optimization of washing parameters for each rack, improving overall washing efficiency while maintaining a relatively simple overall system structure.
4Reliability
If conventional dishwashers heat water for the entire washing cycle, then washing performance is improved, but power consumption increases
Solution Approach 1:
The water heating system operates dynamically based on the detected washing load and required washing parameters. The control method enables selective heating for upper and lower racks independently, heating water only when and where needed. This dynamic control maintains high washing performance while significantly reducing power consumption by avoiding unnecessary heating throughout the entire cycle.
Solution Approach 2:
The system changes water temperature parameters dynamically based on the washing stage and rack requirements. The control method allows different temperature parameters for different racks and different stages of the washing cycle, optimizing the balance between washing performance and energy consumption by applying heat only where and when necessary.
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 maximizes washing efficiency by ensuring dishes with different loads are washed effectively in a single compartment, reducing wash time and power consumption by tailoring water pressure and temperature to specific loads.
Implementation Method 1
a sump heater configured to heat the water
Implementation Method 2
a steam generator configured to supply steam to the washing compartment
Implementation Method 3
an upper and lower spraying arm configured to spray the water
Data Source
Figure 1
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AI summary
Dishwashers and methods of control for operation of dishwashers are disclosed. The dishwasher may include an upper rack (160) in an upper portion of a washing compartment (150) configured to receive small dishes, such as a cup having a small washing load, and a lower rack (170) in a lower portion of the washing compartment (150) for placing large dishes, such as a dinner bowl having a large washing load. The operation of the dishwasher can include wash and rinse cycles having a plurality of sub-cycles. During the sub-cycles, the upper and lower racks (160,170) can be selectively sprayed with water and steam can be supplied to the washing compartment (150) based on configured conditions, such as a water temperature or operation time being reached. The operation of the dishwasher can reduce excessive washing of dishes having small washing loads and reduce power consumption of the dishwasher.