Vehicle Key Unit Layout for Noise Reduction
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Solution Overview
Problem
Existing key units for smart key systems face communication defects due to noise interference between low-frequency (LF) and radio-frequency (RF) circuits, which affects the sensitivity and reliability of locking and unlocking operations in vehicles.
Innovation Solution
The key unit optimally disposes LF and RF communication units and a power supply circuit on a substrate, positioning them to minimize noise interference, with LF and RF components facing each other across a controller, and the power supply circuit facing the LF unit, thereby enhancing communication sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If LF and RF communication units are mounted on the same substrate, then device integration is improved, but noise interference between circuits increases
Solution Approach 1:
The substrate is divided into distinct mounting regions for LF and RF communication units, with each unit positioned in a separate area to minimize electromagnetic interference while maintaining integration on the same substrate
Solution Approach 2:
Different regions of the substrate are optimized for different frequency bands, with LF units positioned away from RF units to reduce noise interference, creating localized optimal conditions for each communication type
2Productivity
If communication units are positioned close to the controller, then signal processing efficiency is improved, but noise interference increases
Solution Approach 1:
The substrate layout segments communication units and controller into distinct zones, allowing communication units to be positioned at optimal distances that balance signal processing efficiency with noise reduction
3Area of stationary object
If multiple communication circuits are disposed on a compact substrate, then device size is reduced, but communication sensitivity decreases
Solution Approach 1:
The substrate layout creates localized optimal conditions for each communication unit, positioning LF and RF units in specific regions that maintain adequate spacing for sensitivity while keeping the overall substrate area compact
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 reduces noise influence and improves communication sensitivity, ensuring reliable locking and unlocking operations in vehicles without remodeling existing smart key systems.
Implementation Method 1
a first communication unit configured to receive a request signal transmitted in a first frequency band from the locking and unlocking device
Implementation Method 2
a second communication unit configured to transmit a response signal to the locking and unlocking device in a second frequency band
Data Source
AI summary
A key unit authenticates a portable terminal based on information acquired from the portable terminal and controls locking and unlocking of a target by transmitting a signal to a locking and unlocking device. The key unit includes: a first communication unit configured to receive a request signal transmitted in a first frequency band from the locking and unlocking device; a controller configured to authenticate the portable terminal and process signals transmitted to and received from the locking and unlocking device; a second communication unit configured to perform short-range wireless communication with the portable terminal in a second frequency band; and a substrate on which the first communication unit, the controller, and the second communication unit are mounted. The first communication unit and the second communication unit are mounted at positions facing each other across the controller, on the substrate.