Vehicle Passive Entry System Location Determination
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional passive entry systems for vehicles fail to accurately determine the location and distance of a remote transmitter relative to the vehicle, making it difficult to distinguish which door the transmitter is approaching or how far it is from the vehicle.
Innovation Solution
A passive entry system that uses a controller with transceiver units and antennas positioned around the vehicle to transmit and receive unique signals, allowing for the determination of the remote transmitter's location and distance through polling sequences and acknowledgement signals, enabling automatic locking or unlocking of doors without operator intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional passive entry systems use basic transmitter detection, then the system can detect the presence of a remote transmitter, but it cannot accurately determine the location and distance of the transmitter relative to the vehicle
Solution Approach 1:
The system divides the vehicle into multiple zones with dedicated transceiver units positioned at different locations (front, rear, left, right). Each transceiver unit independently polls for transmitters in its specific zone, allowing precise location determination through spatial segmentation of the detection field.
Solution Approach 2:
The system introduces polling sequences and acknowledgement signals as intermediary communication protocols between the transceiver units and remote transmitters. These intermediary signals enable two-way communication that provides distance and location information without requiring direct line-of-sight or complex hardware modifications.
2Productivity
If the system waits for operator intervention to lock or unlock doors, then security is maintained, but the time required to lock or unlock doors is increased
Solution Approach 1:
The system continuously polls for remote transmitters in advance before the operator needs to access the vehicle. When a transmitter is detected within the polling range, the system pre-positions the door locks in the unlocked state, so that when the operator approaches, the doors are already ready to open, eliminating the delay of active locking/unlocking operations.
Solution Approach 2:
The passive entry system automatically detects the operator's presence through continuous polling and self-activates the door unlocking function without requiring the operator to press buttons or perform any manual intervention. The system serves itself by monitoring its own environment and autonomously making security decisions based on detected transmitter positions.
3Measurement precision
If the system uses multiple transceiver units positioned around the vehicle, then location determination accuracy is improved, but the device complexity increases
Solution Approach 1:
Each transceiver unit is designed to perform multiple functions: transmitting polling signals, receiving acknowledgements, determining distance based on signal strength, and identifying the specific door zone. This multi-functionality reduces the need for separate specialized components for each detection task, thereby managing complexity while maintaining high measurement precision.
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
Significantly reduces the time required to lock or unlock vehicle doors by accurately determining the remote transmitter's location and distance, ensuring secure and efficient operation.
Implementation Method 1
a first transceiver unit positioned at a first location relative to the vehicle to transmit a first polling signal and to receive a first acknowledgement signal in response to the first polling signal
Data Source
AI summary
A passive entry system and method for determining the location of a remote transmitter positioned near a vehicle. The system and method including a transmitter configured to transmit one or more polling sequences. The polling sequences including one or more polling signals indicative of a particular side and/or door of the vehicle. The system and method further including a receiver configured to receive an acknowledgement signal from a remote transmitter in response to one or more of the polling sequences. The system and method also including a controller configured to determine if the remote transmitter is positioned near the first side or second side of the vehicle based upon the acknowledgement signal being in response to the first or second polling sequence.