Smartphone Passive Entry Using Bluetooth Proximity Detection
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Solution Overview
Problem
Existing smartphone-based systems for controlling vehicle functions face latency issues due to reliance on cellular networks for wireless communication, which affects the responsiveness of commands such as locking, unlocking, and starting a vehicle.
Innovation Solution
A system that incorporates a Bluetooth receiver in the vehicle and a smartphone with both long-range RF transceivers for cellular network communication and Bluetooth transmitters for short-range communication, allowing the smartphone to act as a key fob for remote keyless entry, passive entry, and push-button start functions without relying on cellular networks for command execution within a predetermined range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If smartphone uses cellular network for vehicle control communication, then long-range communication capability is achieved, but latency increases and response time deteriorates
Solution Approach 1:
The communication system is segmented into two distinct modes: cellular network communication for long-range operations and Bluetooth communication for short-range operations. This segmentation allows each communication channel to be optimized for its specific use case, with Bluetooth providing low-latency direct communication when the smartphone is near the vehicle, while cellular network handles remote communication scenarios.
2Adaptability or versatility
If smartphone acts as key fob using cellular network, then remote vehicle control is enabled, but command execution speed decreases
Solution Approach 1:
The system dynamically switches between cellular network and Bluetooth communication modes based on proximity conditions. When the smartphone is detected to be within a predetermined range of the vehicle, the system automatically transitions to Bluetooth mode for faster command execution. This dynamic adaptation maintains key fob functionality while optimizing command execution speed based on real-time spatial conditions.
3Loss of time
If Bluetooth communication is used for vehicle control, then latency is reduced and response time improves, but communication range is limited
Solution Approach 1:
The smartphone is designed to perform multiple communication functions using different technologies. It can operate as a remote key fob using cellular network for long-range commands, and simultaneously function as a proximity-based access device using Bluetooth for short-range high-speed communication. This multi-functionality ensures that the system can adapt to various operational scenarios regardless of distance.
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 solution reduces latency by enabling immediate communication for vehicle control functions through Bluetooth, allowing the smartphone to unlock doors, start the vehicle, and provide diagnostic information without cellular network delays, and can operate as a key fob even when out of range, enhancing convenience and efficiency.
Implementation Method 1
a BLUETOOTH transmitter configured to communicate with the BLUETOOTH receiver in the vehicle within a predetermined range
Implementation Method 2
a long-range radio frequency (RF) transceiver configured to transmit signals to and receive signals from a cellular network
Data Source
AI summary
A system for a vehicle including: a bluetooth receiver configured to be installed in a vehicle and connected with an electronic system of the vehicle; and a phone including a long-range radio frequency (RF) transceiver configured to transmit signals to and receive signals from a cellular network and a bluetooth transmitter configured to communicate with the bluetooth receiver in the vehicle within a predetermined range.