Lifting device, method for operating a lifting device, and dish washing machine
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Solution Overview
Problem
Existing lifting devices for dishwashing machines lack effective methods to detect the position and weight of dishware receptacles and identify fault conditions, such as obstructions, without additional sensors, which can compromise safety and efficiency.
Innovation Solution
A lifting device with an electrical drive mechanism that analyzes current draw over travel distance to identify status, using derivatives and reference curves to determine position, weight, and fault conditions, and incorporates a weight sensor for enhanced accuracy, allowing for precise control and operation without manual assistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional sensors are installed to detect position and weight, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The drive mechanism serves dual purposes: it moves the dishware receptacle while simultaneously providing position and weight information through its current draw characteristics. The system uses its own operational parameters (current consumption during movement) to detect status, eliminating the need for separate sensing systems.
Solution Approach 2:
The electrical drive mechanism is designed to perform multiple functions: actuation of the dishware receptacle and status detection (position, weight, faults). By analyzing current draw characteristics during operation, the same component that provides motion also provides diagnostic information, reducing overall system complexity.
2Reliability
If additional sensors are installed to detect position and weight, then reliability is improved, but manufacturing cost increases
Solution Approach 1:
The drive mechanism provides self-diagnostics by monitoring its own current consumption patterns. Fault conditions, obstructions, and status information are detected through analysis of operational parameters already present in the system, eliminating the need for additional expensive sensing components.
Solution Approach 2:
The system continuously monitors current draw during operation and uses this feedback to detect faults, obstructions, and status changes. This closed-loop monitoring approach provides reliable fault detection using existing system parameters rather than requiring separate sensing infrastructure.
3Reliability
If current draw analysis over time is used, then fault detection capability is improved, but processing complexity increases
Solution Approach 1:
Instead of analyzing current draw over time, the patent transforms the analysis to current draw over travel distance. This dimensional change simplifies the data processing by using position-based sampling points along the movement path, reducing computational complexity while maintaining fault detection capability.
Solution Approach 2:
The system changes the independent variable for analysis from time to travel distance. By parameterizing current draw characteristics along the spatial path rather than temporal sequence, the processing becomes simpler and more directly related to the physical state of the system at each position.
Data Source
AI summary
A lifting device for a dishwashing machine includes an electrical drive mechanism constructed to move a dishware receptacle of the dishwashing machine between a start position and an end position. A detection unit detects a current draw of the electrical drive mechanism over a travel distance of the dishware receptacle in the dishwashing machine, and an identification unit identifies a status of the lifting device on the basis of the current draw of the electrical drive mechanism detected over the travel distance.