Tailgate Load Switch to Block Auto-Opening Under Cargo Overload
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Solution Overview
Problem
Vehicle tailgates may automatically open excessively or sustain damage when a cargo load exceeds a predetermined threshold, leading to operational issues and potential harm, especially when users are not aware of the overload.
Innovation Solution
A tailgate assembly with a switch that prevents automatic opening when a load exceeding the threshold is applied, using a load distributor and springs to actuate the switch, which controls the tailgate mechanism to prevent excessive opening and alerts the user of the overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic tailgate opening command is executed when cargo load exceeds threshold, then productivity is improved (faster cargo access), but reliability deteriorates (tailgate damage or excessive opening speed)
Solution Approach 1:
The switch assembly is positioned to detect cargo load before the automatic opening command is executed. The load detection occurs in advance, allowing the system to prevent the opening command if excessive load is detected, thus avoiding tailgate damage while maintaining productivity when loads are appropriate
Solution Approach 2:
The switch assembly provides feedback about the cargo load condition to the tailgate control system. This feedback mechanism allows the system to automatically adjust its behavior based on the detected load, preventing opening when loads exceed the threshold and maintaining normal operation when loads are within safe limits
2Reliability
If switch assembly is added to detect load, then reliability is improved (prevention of tailgate damage), but device complexity increases
Solution Approach 1:
The switch assembly is integrated into the existing tailgate structure, combining the load detection function with the garnish panel. This merging approach allows the system to gain reliable load detection capability while minimizing the increase in overall device complexity by reusing existing structural elements
Solution Approach 2:
The load distributor acts as an intermediary element that translates the physical cargo load into a form that can be detected by the switch assembly. This intermediary mechanism simplifies the detection process by providing a clear mechanical signal when the load threshold is exceeded, reducing the complexity of the detection system
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
Prevents automatic tailgate opening under excessive load, ensuring safe operation and preventing damage to the tailgate and its mechanism, while alerting users to potential overload conditions.
Implementation Method 1
A spring is positioned between the load distributor and the tailgate rear edge and is structured to apply a restoring force on the load distributor
Implementation Method 2
The switch assembly includes a switch structured to be actuatable by application of a load exceeding a predetermined threshold value to the tailgate
Data Source
AI summary
A vehicle tailgate assembly includes a tailgate and a switch assembly operably connected to the tailgate. The switch assembly includes a switch structured to be actuatable by application of a load exceeding a predetermined threshold to the tailgate. The switch assembly is operably connected to a tailgate automatic opening/closing mechanism such that actuation of the switch controls operation of the mechanism to prevent execution of a command to automatically open the tailgate when the tailgate is in a fully closed condition.