Dish washing machine with a lifting device, method for operating a lifting device
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Solution Overview
Problem
Existing dishwasher lifting devices lack effective methods for determining the state of the lifting device, such as error conditions, without relying on time-based evaluations, and often require additional sensors, which complicates safety and accuracy.
Innovation Solution
An electric drive device with a detection unit that evaluates current consumption over a displacement path to determine the state of the lifting device, including position and weight, using mathematical derivatives and reference curves, eliminating the need for additional sensors and improving safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If time-based evaluation of drive current is used to detect error states, then error detection capability is improved, but the system complexity increases and additional sensors may be required
Solution Approach 1:
The electric drive device uses its own current consumption data to detect error states without requiring external sensors or additional detection systems. The detection unit evaluates the current consumption profile generated during normal operation to identify blocking conditions, making the system self-diagnostic and avoiding additional hardware complexity
Solution Approach 2:
The patent replaces time-based evaluation methods with a path-based evaluation method using the first mathematical derivation of current consumption with respect to displacement path. This substitution eliminates the need for time synchronization and additional temporal sensors, reducing system complexity while maintaining error detection capability
2Measurement precision
If additional sensors are installed to detect lifting device state, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The electric drive device serves its own detection needs by evaluating its current consumption profile during operation. The detection unit extracts position, weight, and error state information from the drive device's inherent electrical characteristics without requiring external sensors, thereby maintaining measurement precision while minimizing device complexity
Solution Approach 2:
The current consumption evaluation system performs multiple detection functions simultaneously - determining position, load weight, and error states - using a single detection unit that analyzes the drive device's electrical characteristics. This multi-functional approach eliminates the need for separate sensors for each parameter
Data Source
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AI summary
The invention relates to a lifting device (17) for a dish washing machine (1), in particular a domestic dish washing machine, with a rinsing item receptacle (10), wherein the lifting device (17) comprises an electric driver (24) which is designed to shift the rinsing item receptacle (10) between a starting position (PA) and an end position (PE) by means of raising or lowering, a sensing unit (40) for sensing a current consumption of the electric driver (24) over a shifting distance (x) of the rinsing item receptacle (10) in the dish washing machine (1), and a determination unit (41) for determining at least one state of the lifting device (17) depending on the current consumption (I) of the driver (24), said current consumption (I) being sensed over the shifting distance (x).