Keyless Vehicle Control via Static Detection and Periodic Authentication
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Solution Overview
Problem
Existing keyless vehicle control systems face challenges in providing hands-free operation, security, and cost-effectiveness, with issues such as unintentional unlocking, high power consumption, and increased costs due to multiple sensors required for detection units.
Innovation Solution
A keyless system that uses a car-mounted device and a portable device for authentication via LF and UHF communication, incorporating a static action detection mechanism using acceleration sensors and processors to authenticate user intent, reducing the need for manual operation and minimizing sensor installations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the car-mounted device always transmits a challenge signal in LF band to enable authentication, then the user can perform vehicle control by approaching the vehicle, but the battery drains fast and radio interference occurs
Solution Approach 1:
The car-mounted device transmits challenge signals periodically at predetermined intervals instead of continuously, and the portable device transmits response signals only when needed. This periodic transmission pattern reduces battery consumption and minimizes radio interference while maintaining the ability to authenticate users who approach the vehicle.
2Ease of operation
If the door lock control apparatus is extended to unlock control by approaching, then hands-free operation is achieved, but unintentional unlocking occurs reducing security
Solution Approach 1:
The portable device serves as an intermediary that requires active participation from the user. When the car-mounted device transmits a challenge signal, the portable device must actively transmit a response signal to complete authentication. This intermediary step prevents unintentional unlocking because the system requires a deliberate action (response transmission) rather than merely detecting presence.
3Ease of operation
If ultrasonic sensor, infrared sensor, and motion sensor are installed to detect user presence and action, then hands-free slide door control is achieved, but the number of parts increases causing high cost
Solution Approach 1:
The portable device performs multiple functions: it serves as both the authentication credential and the action detection mechanism. The acceleration sensor in the portable device detects user actions (such as kicking motion) and the processor determines user intent based on this data. This eliminates the need for separate ultrasonic sensors, infrared sensors, and motion sensors to be installed on the vehicle, reducing part count and cost while maintaining hands-free operation capability.
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
Enables secure, hands-free vehicle control with reduced power consumption and lower costs by authenticating user intent through static action detection, preventing unintentional operations and simplifying device configurations.
Implementation Method 1
an action detection section configured to sense and convert vibrations or a change of position of the portable device into an electric signal
Implementation Method 2
a first close-range communication equipment configured to transmit the challenge signal through a signal in an LF band
Implementation Method 3
a first medium- to long-range communication equipment configured to receive a signal in a UHF band transmitted by the portable device
Data Source
AI summary
In a keyless system including a car-mounted device and a portable device carried by a user, the portable device detects the static state of the portable device for an arbitrarily set time period or longer with a static action detection section, and transmits a response signal serving as a response to a challenge signal transmitted from the car-mounted device on condition that the static state has been detected by the static action detection section. This can allow vehicle control such as locking and unlocking of a door of a vehicle through a simple action not requiring operation with a user's hand, and can prevent unnecessary vehicle control not intended by the user.