Tail Lift Control via Voltage Monitoring
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Solution Overview
Problem
Tail lifts face risks of damage due to improper load management and stowage, as existing systems lack effective real-time monitoring of load and voltage changes, leading to potential collisions with stops or insufficient contact pressure.
Innovation Solution
A method for controlling tail lifts based on measuring and analyzing electrical voltage changes, determining load and slope deviations, and comparing them to pre-defined gradients and characteristics to ensure safe operation and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the same hydraulic system is used for lifting and stowage operations, then device complexity is reduced, but the risk of damage increases due to inability to distinguish between normal operation and improper stowage
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring the electrical voltage of the hydraulic drive during operation. The control unit measures the voltage and compares it against expected ranges to detect abnormal conditions such as improper stowage or overloading, enabling the system to respond appropriately without requiring separate hydraulic circuits.
Solution Approach 2:
The patent replaces mechanical monitoring mechanisms with an electrical monitoring system. Instead of using mechanical sensors or switches to detect load conditions and stowage status, the system uses electrical voltage measurements of the hydraulic drive to infer mechanical state, thereby reducing mechanical complexity while improving reliability.
2Measurement precision
If voltage monitoring is implemented to detect load conditions, then measurement precision is improved, but device complexity increases due to additional monitoring systems
Solution Approach 1:
The patent utilizes the existing hydraulic drive's electrical characteristics to provide self-diagnosis and self-monitoring capabilities. The control unit leverages the natural voltage variations that occur during hydraulic operation to detect load conditions, eliminating the need for separate sensors or monitoring devices while achieving precise load detection.
Solution Approach 2:
The control unit serves multiple functions: it controls the hydraulic drive for lifting and stowage operations, monitors electrical voltage to detect load conditions, and provides safety interlocks. This multi-functionality reduces the need for separate dedicated monitoring systems, thereby minimizing additional complexity while maintaining high measurement precision.
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 allows for real-time feedback and control of tail lift operations, preventing damage by stopping the drive when maximum load or deviation thresholds are exceeded, ensuring smooth operation and reducing the risk of collisions or overloading.
Implementation Method 1
wenn von einer Steigung des Spannungsverlaufs über die Zeit abgewichen wird
Implementation Method 2
die Betätigung des Ladebodens erfolgt durch ein hydraulisches Antriebsystem
Data Source
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AI summary
Lifting platforms (10) are used to facilitate the loading and unloading of vehicles, particularly with heavy objects. The lifting, swiveling, lowering, and stowing of the lifting platforms (10) or loading platform (13) are typically performed by the same hydraulic system or drives. Since these drives are correspondingly powerful for lifting loads, there is a risk that the loading platform (13), the lifting mechanism, or the loading platform itself may be damaged when stowing it on the superstructure (12) or underneath it if the lifting movement is not stopped in time. The invention provides a method for controlling a lifting platform (10) that enables its safe operation. For this purpose, the lifting platform (10) is controlled based on an electrical voltage measured during operation of the lifting platform (13) at least once by the drive unit.