Vehicle Remote Key RF Signal Retransmission Relay
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Solution Overview
Problem
Existing vehicle remote control key systems have limited RF signal transmission distance, often failing to reach vehicles outside a 30-meter range, especially in obstructed areas, leading to unreliable remote operation.
Innovation Solution
A vehicle remote control key system that retransmits RF signals from nearby vehicles, increasing the reception distance by adjusting radio wave intensity and using a count bit to limit retransmissions, allowing for extended control functions like door operation, trunk opening, and remote start.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of stationary object
If the remote control key uses a small battery to ensure long lifespan, then the battery durability is improved, but the RF signal transmission distance deteriorates
Solution Approach 1:
Other vehicles in the vicinity act as intermediary nodes to retransmit the RF signal from the remote control key to the target vehicle. This relay mechanism extends the effective transmission distance without requiring the remote control key to increase its transmission power, thus preserving battery lifespan.
2Length of stationary object
If the remote control key increases RF signal output to extend transmission distance, then the reception distance is improved, but the battery power consumption increases
Solution Approach 1:
The signal transmission task is segmented across multiple vehicles. Instead of one vehicle transmitting at high power over long distance, multiple vehicles cooperatively retransmit the signal over shorter distances, reducing the power consumption requirement for each individual transmission while achieving the same overall communication range.
3Reliability
If the vehicle controller continuously monitors RF signals to ensure reliable reception, then the signal detection reliability is improved, but the current consumption increases
Solution Approach 1:
The vehicle controller operates in periodic wake-up cycles rather than continuous monitoring. The RF receiver wakes up for short periods to check for signals, then returns to sleep mode. This periodic operation maintains signal detection capability while significantly reducing average current consumption.
Data Source
AI summary
A vehicle remote control key system and a method of processing a signal in the system are provided. The system includes a remote control key that is configured to send out a radio frequency (RF) signal that includes an identification (ID) and operation information to remotely control a target vehicle based on a remote control key operation. In addition, a controller is configured to determine whether the ID of the received RF signal is available and perform the remote control when the ID is available and the controller retransmits the RF signal to a vehicle in the vicinity of the target vehicle when the ID is unavailable and increases a count bit, which stores the number or times of retransmission in a frame, by one when retransmitting the RF signal.