Dishwasher Reversing Device Position Sensing from Pump Drive Signals
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Solution Overview
Problem
Existing dishwasher technologies face challenges in detecting the current position of the reversing device in a simple and cost-effective manner, which affects the efficient distribution of washing liquid to spray devices.
Innovation Solution
A method and apparatus for a dishwasher that utilizes operating parameters such as hydraulic load, electric current, or power output of the circulating pump's drive to detect and control the position of the reversing device, eliminating the need for additional feedback contacts and allowing for simpler control device configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional feedback contacts are used to detect the reversing device position, then measurement precision is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The system uses the existing operating parameters of the circulating pump (current, power, hydraulic load) to detect the reversing device position. The pump's own operational characteristics serve as the detection mechanism, eliminating the need for separate feedback contacts or additional sensing components.
Solution Approach 2:
The operating parameters of the circulating pump serve dual purposes: controlling the pump operation and detecting the reversing device position. This multi-functionality allows the same measurement data to be used for both control and position detection, reducing the need for additional specialized components.
2Reliability
If additional feedback contacts are installed to detect reversing device position, then reliability is improved, but ease of manufacture deteriorates
Solution Approach 1:
The circulating pump's operational parameters inherently provide position detection capability. By utilizing the pump's own electrical and hydraulic characteristics, the system achieves reliable position detection without requiring additional components that would complicate the manufacturing process.
Solution Approach 2:
The position detection function is extracted from the traditional feedback contact mechanism and integrated into the existing pump control system. This eliminates the need to manufacture and assemble additional feedback contacts, simplifying the overall manufacturing process while maintaining detection reliability.
3Measurement precision
If traditional feedback contacts are used for position detection, then measurement precision is maintained, but device complexity and cost increase
Solution Approach 1:
The control system utilizes the circulating pump's operating parameters for multiple functions: motor control, performance monitoring, and position detection. This universal use of existing data reduces the need for separate detection systems and simplifies the overall control architecture.
Solution Approach 2:
The mechanical feedback contact system is replaced with an electrical/electronic detection method that uses the pump's operational parameters. This substitution eliminates mechanical wear components and simplifies the control system structure while maintaining or improving detection precision.
Data Source
AI summary
A method for operating a dishwasher that has a washing container; at least two spray devices disposed inside the washing container; a circulating pump to deliver liquid to the at least two spray devices; a first drive to drive the circulating pump; and a reversing device; wherein, based on a position of the reversing device, the circulating pump delivers the liquid to one or both of the two spray devices. The method includes adjusting the position of the reversing device and detecting the current position of the reversing device based on an operating parameter assigned to the first drive.