Industrial Truck Load Sensor Stability Control
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Solution Overview
Problem
Existing industrial truck systems require multiple sensors for accurate stability limit determination, leading to unnecessary safety warnings due to high tolerances and increased costs, while also being complex and prone to operator error in determining maximum lifting heights.
Innovation Solution
An industrial truck with an adjustable mast and a single load sensor to detect the weight of the load, coupled with a control unit that allows manual selection of load centers and generates visual and acoustic warnings when approaching the maximum permissible lifting height, simplifying the determination of the maximum lifting height without complex mathematical calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple sensors are used to determine stability limit, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts and eliminates unnecessary sensors from the system. Instead of using multiple sensors (load sensors, height sensors, tilt sensors) to determine stability limits, the invention uses only the load sensor data combined with a pre-stored capacity diagram in the controller. This reduces the sensor quantity while maintaining measurement precision through the use of manufacturer-provided capacity data that accounts for all stability factors.
Solution Approach 2:
The capacity diagram is pre-calculated and stored in the controller before operation. This preliminary action includes computing stability limits for various load configurations and storing them in a lookup table format. During operation, the controller simply retrieves the appropriate stability limit from the stored diagram based on current load conditions, eliminating the need for real-time complex calculations and multiple sensors.
2Device complexity
If mathematical methods with tolerance inputs are used, then device complexity is reduced, but reliability decreases due to large safety margins
Solution Approach 1:
The patent uses a copy of the manufacturer's capacity diagram data stored in the controller. This copy contains pre-calculated stability limits that account for all tolerances and safety factors. Instead of performing real-time mathematical calculations with tolerance-prone input values, the system retrieves the authoritative capacity data from the stored diagram, ensuring reliability while maintaining simple device operation.
Solution Approach 2:
The capacity diagram serves as a self-contained reference that contains all necessary stability information. The controller automatically retrieves and applies the appropriate stability limits from the stored diagram based on current load conditions, without requiring complex real-time calculations or external intervention. This self-service approach ensures consistent and reliable stability determination.
3Loss of information
If capacity diagram in matrix form is used, then information completeness is improved, but ease of operation deteriorates due to manual lookup complexity
Solution Approach 1:
The patent replaces the manual mechanical process of looking up capacity values in a matrix diagram with an automated electronic system. The controller automatically retrieves the appropriate stability limit from the stored capacity diagram based on real-time load sensor data, eliminating the need for operators to manually locate values in a matrix and perform comparisons. This substitution maintains complete capacity information while dramatically improving ease of operation.
Solution Approach 2:
The system implements automatic feedback by continuously monitoring load sensor data and comparing it against the stored capacity diagram. The controller automatically determines whether the current load exceeds stability limits and can trigger appropriate warnings or control actions. This feedback loop eliminates manual operator intervention while maintaining complete and accurate capacity information.
4Measurement precision
If low-tolerance sensors are used, then measurement precision is improved, but cost increases
Solution Approach 1:
The patent extracts and removes the need for expensive low-tolerance sensors from the system. By using only standard load sensors with typical tolerances and combining their output with pre-stored capacity diagram data, the system achieves accurate stability determination without requiring costly high-precision sensors for height, tilt, or other parameters.
Solution Approach 2:
The system changes the approach from using multiple high-precision sensor parameters to using a single load sensor parameter combined with pre-calculated capacity data. This parameter change strategy maintains measurement precision by relying on the authoritative capacity diagram that already accounts for all physical factors, while significantly reducing system cost by eliminating expensive sensors.
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 solution reliably determines the physical stability limit using fewer sensors, reduces unnecessary warnings, and enhances operator safety by providing clear warnings of critical lifting height approaches, thus improving operational efficiency and safety.
Implementation Method 1
a load sensor which detects the weight of a picked-up load on the load supporting means
Data Source
AI summary
Industrial truck with a load-bearing element (12) adjustable in height along a lifting frame (16), the load of which is detected by a load sensor, wherein a control unit (32) is provided on which one or more load centers can be selected and which determines a permissible lifting height for the selected load center(s) on the basis of the detected load.