Multi-Channel RKE Receiver RSSI Noise Assessment
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Solution Overview
Problem
Remote keyless entry (RKE) systems face interference from other communication devices like tire pressure monitoring systems, leading to increased power consumption due to the need to monitor multiple channels simultaneously, which results in higher quiescent current and power drain.
Innovation Solution
A multi-channel RKE system that uses a receiver with a RSSI circuit to determine the channel with the lowest noise level, allowing the system to selectively energize the receiving circuit only on the preferred channel, reducing power consumption by minimizing the time spent searching for signals across all channels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the receiver monitors all communication channels simultaneously to avoid interference, then communication reliability is improved, but power consumption increases due to higher quiescent current
Solution Approach 1:
The communication channel monitoring is segmented into individual channel assessments rather than simultaneous monitoring of all channels. The system divides the channel selection process into discrete steps where each channel is evaluated separately based on RSSI measurements, allowing the receiver to focus on one channel at a time instead of maintaining continuous monitoring across all channels simultaneously.
Solution Approach 2:
The system performs preliminary channel quality assessment using RSSI measurements before establishing communication on a selected channel. By pre-evaluating channel conditions and identifying the optimal channel in advance, the receiver avoids the need to continuously monitor all channels during active communication, thereby reducing power consumption while maintaining communication reliability.
2Reliability
If the receiver dwells on all channels waiting for signals, then signal detection capability is improved, but the on time of the receiver increases causing power drain
Solution Approach 1:
The receiver's operational state is made dynamic rather than static. Instead of continuously dwelling on all channels, the system dynamically transitions between channels based on pre-assessed quality metrics. The receiver activates only when needed on the selected optimal channel, adapting its operational timing to actual communication requirements rather than maintaining constant monitoring presence across all channels.
Solution Approach 2:
The system changes the operational parameters of the receiver by selecting specific channels based on RSSI threshold criteria. Rather than uniformly monitoring all channels with equal intensity, the receiver adjusts its monitoring parameters to focus only on channels that meet quality thresholds, thereby reducing total receiver on-time and power consumption while maintaining effective signal detection capability.
3Object-affected harmful factors
If multiple communication channels are used to transmit commands, then interference from other systems is reduced, but device complexity increases
Solution Approach 1:
The system implements partial multi-channel monitoring by assessing only the necessary number of channels to identify a suitable communication path, rather than exhaustively monitoring all possible channels continuously. The RSSI-based threshold approach allows the system to evaluate channels partially (only those meeting quality criteria) and proceed with communication once a sufficient channel is identified, avoiding the complexity of comprehensive continuous multi-channel monitoring while still providing interference mitigation.
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 approach minimizes power consumption and reduces interference by focusing on the channel with the lowest noise level, ensuring efficient communication while maintaining low power usage and effective keyless entry functions.
Implementation Method 1
A vehicle based electronic control module includes a receiver for receiving remote keyless entry commands at any one of the plurality of channels. The electronic control module includes a RSSI circuit for determining a preferred channel having a lowest noise level.
Data Source
AI summary
A remote keyless entry system includes a portable communication device for communicating with an electronic control module of a transportation vehicle. The transmitter has at least two selectable communication channels for broadcasting communications signals to the transportation vehicle. A vehicle based electronic control module communicates with the portable communication device. The electronic control module includes a receiver that includes at least two selectable communication channels for receiving RF signals from the portable communication device. A controller selectively energizes the receiver for measuring a RSSI voltage level of each selectable communication channel of the receiver over respective predetermined time periods. The controller determines which of the at least two selectable communication channels includes a lowest noise level based on the measured RSSI voltage level. A channel status update signal is broadcast from the electronic control module to the portable communication device identifying the selected communication channel having the lowest noise level.