Vehicle Key Detection Antenna Layout for In-Cabin Location Accuracy
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Solution Overview
Problem
Existing vehicle systems using two antennas to determine the location of an electronic key within a cabin can erroneously conclude that the key is not present, despite it being inside, due to vehicle size and shape variations.
Innovation Solution
Incorporating a third antenna positioned between the first and second antennas in the vehicle's right-left direction and on the front side of both in the front-rear direction, with a control unit that determines the key's location based on signals from all three antennas, ensuring accurate detection within the cabin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If two antennas are used to determine key location, then the device complexity is reduced, but the measurement precision deteriorates causing erroneous determination
Solution Approach 1:
The patent transitions from a two-antenna configuration to a three-antenna configuration, adding spatial dimensionality to the detection system. The third antenna is positioned between the first and second antennas in the right-left direction and on the front side, creating a more comprehensive spatial coverage that resolves the measurement precision issue while maintaining reasonable device complexity.
2Device complexity
If two antennas are used, then the device complexity is lower, but the reliability deteriorates due to false negative determinations
Solution Approach 1:
By adding the third antenna in a different spatial position (between the first and second antennas in the right-left direction and on the front side), the system gains additional detection capability that eliminates blind spots and ensures reliable key presence determination throughout the cabin space.
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 prevents erroneous determinations of the key's absence within the vehicle, allowing precise location detection and enabling proper vehicle start control based on the key's presence.
Implementation Method 1
a first antenna 21 that receives a signal from an electronic key 90
Implementation Method 2
a second antenna 22 that receives a signal from the electronic key 90
Implementation Method 3
a third antenna 23 that receives a signal from the electronic key 90
Data Source
AI summary
When the first antenna receives a signal from the electronic key and the second antenna receives a signal from the electronic key, the execution device determines that the electronic key is located in the interior of the vehicle. When one of the first antenna and the second antenna receives the signal from the electronic key, the execution device determines that the electronic key is not located in the interior of the vehicle. The execution device determines that the electronic key is located in the interior of the vehicle when the third antenna receives a signal from the electronic key, even if either the first antenna or the second antenna receives a signal from the electronic key.