Liftgate Operating Device Position Detection for Safety
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Solution Overview
Problem
Existing tail lift systems for vehicles lack reliable operational safety measures, particularly in ensuring visual contact with the work area during operation, leading to potential misconfiguration and unsafe usage.
Innovation Solution
A device with detection devices that determine the position of the operating device relative to the tail lift using signal strength or triangulation, ensuring that the operating device is within a predefined safe space for visual contact with the work area, and preventing activation if outside this space, with information stored in a non-changeable memory to prevent user misconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the permissible operating distance is configured to be large to extend the operating range, then the ease of operation is improved, but the operational safety deteriorates because the operator may be out of visual contact with the work area
Solution Approach 1:
The system continuously monitors the position of the operating device relative to the vehicle and provides feedback by enabling or disabling control functionality. The computing device determines whether the operating device is within the authorized space and dynamically controls whether the control device can operate the liftgate, creating a closed-loop safety mechanism that maintains operational safety while allowing maximum permissible operating range.
Solution Approach 2:
The authorized operating space is dynamically defined based on the real-time position of the liftgate. As the liftgate moves through different positions (raised, lowered, swiveled), the boundary of the authorized space adjusts accordingly, ensuring that the operator remains within a safe visual contact zone while allowing flexible operation across the full range of motion.
2Reliability
If the permissible operating distance is configured to be small to ensure visual contact, then the operational safety is improved, but the ease of operation deteriorates due to limited operating range
Solution Approach 1:
The system dynamically adjusts the authorized operating space based on the liftgate's real-time position. When the liftgate is in positions that allow visual contact from greater distances, the authorized space expands accordingly. This dynamic adaptation ensures safety is maintained while maximizing the permissible operating range for each specific configuration.
3Adaptability or versatility
If the memory is made changeable to allow user configuration, then the adaptability is improved, but the reliability deteriorates due to potential misconfiguration or unintentional changes
Solution Approach 1:
The authorized operating space parameters are pre-calculated and stored in non-volatile memory during system setup or manufacturing, based on the specific vehicle and liftgate geometry. This preliminary configuration eliminates the need for user modification during operation, preventing misconfiguration while maintaining adaptability through pre-set options for different vehicle types.
Solution Approach 2:
The system uses non-volatile memory that preserves configuration data without requiring power or user intervention to maintain settings. This eliminates the need for changeable memory interfaces that could be accidentally modified, while still allowing initial setup through dedicated configuration procedures that write to the non-volatile storage.
4Device complexity
If a single detection device is used to determine position, then the device complexity is reduced, but the measurement precision deteriorates
Solution Approach 1:
The position determination function is segmented across multiple detection devices distributed at different locations on the vehicle. Each detection device independently measures signals from the operating device, and the computing device combines these multiple measurements to calculate the precise position through triangulation or multilateration, significantly improving accuracy compared to a single sensor.
Solution Approach 2:
The system merges the measurements from multiple detection devices to determine the position of the operating device. By combining signal strength data or time-of-flight measurements from multiple spatially distributed sensors, the system achieves higher measurement precision and redundancy, allowing accurate position determination even if one sensor is obscured or malfunctioning.
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
Significantly enhances operational safety by ensuring the operating device is within a safe, visually accessible area, preventing unintended activation and improving measurement accuracy through the use of multiple detection devices and triangulation methods.
Implementation Method 1
The device includes at least one detection device configured to detect a signal from an operating device for the liftgate, particularly wirelessly; the device includes a computing device configured to determine a position for the operating device
Implementation Method 2
The position of the control unit relative to the antennas can be determined based on a first signal strength at a first antenna, a second signal strength at a second antenna, and a third signal strength at a third antenna. Through triangulation, the position of the control unit relative to the antennas can be determined
Data Source
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AI summary
Method and device (100) for increasing the operational safety of a lifting platform (200) for a vehicle (202), wherein the device (100) comprises at least one detection device (102) configured to wirelessly detect a signal from an operating device (204) for the lifting platform (200), wherein the device (100) comprises a control device configured to control the lifting platform (200) depending on the signal from the operating device (204), wherein the device (100) comprises a computing device configured to determine a position for the operating device (204), and wherein the device (100) comprises a memory for information about a space (206) released for operating the lifting platform (200), which is unchangeable, in particular for a user of the lifting platform (200) and the operating device (202) during operation of the lifting platform.wherein the space (206) surrounds or encompasses at least a part of a working area (208) of the lifting platform (200), and wherein the space (206) is limited, depending on a geometry of the vehicle (202), to positions for which, at least during operation of the lifting platform (200), a line of sight to at least a part of the working area (208) is possible, wherein the computing device is configured to enable control by the control device when it is determined that the position for the operating device (204) lies within the enabled space (206), or to prevent control by the control device when it is determined that the position for the operating device (204) lies outside the enabled space (206). (Figure 2)