Cabin Key Authentication Layout to Prevent External Machine Startup
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Solution Overview
Problem
Existing construction machines with portable keys can be inadvertently started outside the cabin, posing safety risks due to signal leakage through openings like windows or entrances, allowing unauthorized operation.
Innovation Solution
The construction machine is designed with a cabin positioned off-center in the frame width direction, featuring a transmitter on the inner side wall that transmits a first signal, and a portable key that sends a second authentication signal, with a controller verifying the key's authenticity before enabling startup, using shielding to contain the signal within the cabin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the transmitter output is set high to ensure signal coverage throughout the cabin interior space, then the signal can reach the portable key carried by the operator, but the signal may leak out through openings such as windows or entrances, allowing unauthorized startup from outside the cabin
Solution Approach 1:
The cabin is positioned asymmetrically on the body frame, specifically disposed at a position biased in the frame width direction with respect to the widthwise frame center line. The transmitter is attached to the cabin inner side wall, which is located closer to the widthwise frame center line than the cabin outer side wall. This asymmetric arrangement creates a geometric relationship where the signal transmission path is contained within the cabin structure, preventing signal leakage to the outside while ensuring adequate coverage inside the cabin.
2Shape
If the cabin is positioned centrally on the body frame, then the structure appears more balanced, but the transmitter cannot be optimally positioned on the inner side wall to prevent signal leakage
Solution Approach 1:
The cabin is intentionally positioned asymmetrically on the body frame, disposed at a position biased in the frame width direction with respect to the widthwise frame center line. This asymmetric positioning enables the transmitter to be attached to the cabin inner side wall at an optimal location that prevents signal leakage, demonstrating that functional requirements take precedence over aesthetic symmetry in this design.
3Ease of operation
If openings such as windows or entrances are opened to improve operator visibility and access, then the cabin becomes more accessible and functional, but signal leakage increases, allowing portable keys outside the cabin to be detected
Solution Approach 1:
The asymmetric positioning of the cabin and transmitter creates a geometric configuration where the signal containment is maintained even when openings are present. The transmitter's location on the inner side wall, combined with the cabin's offset position on the frame, ensures that the signal propagation path remains contained within the cabin structure, reducing the effectiveness of signal leakage through openings.
4Manufacturing precision
If the transmitter is positioned centrally within the cabin, then signal distribution is more uniform, but the signal can more easily leak out through openings compared to positioning on the inner side wall
Solution Approach 1:
The transmitter is positioned asymmetrically on the cabin inner side wall rather than centrally within the cabin. This asymmetric positioning, combined with the cabin's offset location on the body frame, creates a geometric relationship that contains the signal within the cabin structure and prevents leakage through openings, prioritizing signal containment over uniform distribution.
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 configuration effectively prevents unauthorized startup from outside the cabin, enhancing safety by ensuring the drive source can only be activated with the portable key inside, thus reducing unexpected machine movements.
Implementation Method 1
a transmitter (31) disposed inside the cabin (15) and transmitting a first signal (X1)
Data Source
AI summary
A construction machine includes a portable key, a body frame, a cabin, a transmitter disposed inside the cabin, and a controller. The portable key receives a first signal transmitted from the transmitter and transmits a second signal to the controller. The cabin includes a pair of cabin inner side walls and a cabin outer side wall disposed across an inner space of the cabin, the cabin outer side wall provided with an entrance. The transmitter is attached to the cabin inner side wall. The cabin inner side walls is a side wall closer to the widthwise center line of the body frame than the cabin outer side wall.