Vehicle Communication System Power Management via Dynamic Scan Frequency
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Solution Overview
Problem
Vehicle communication systems consume excessive power when continuously attempting to reconnect to a host during out-of-range events, especially when the engine is off and the system is powered by a battery.
Innovation Solution
A vehicle communication system that includes a connection quality module and a channel scan frequency module, which determines when a vehicle is out-of-range and adjusts the frequency of connection attempts based on the engine status and movement rate, reducing power consumption by decreasing scan frequency during engine-off conditions and increasing it during engine-on conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle continuously attempts to reconnect to the host during out-of-range events, then the connection reliability is improved, but the power consumption increases
Solution Approach 1:
The patent applies dynamics by making the channel scan frequency adjustable based on operational conditions. The system dynamically transitions between different scan frequencies (first frequency when engine is on, second frequency when engine is off) to optimize the balance between connection reliability and power consumption according to the current state of the vehicle
Solution Approach 2:
The patent changes the parameter of channel scan frequency based on engine status and movement rate. By modifying this parameter dynamically - using higher frequency when the engine is running and lower frequency when it's off - the system resolves the contradiction between maintaining reliable connections and minimizing power consumption
2Use of energy by moving object
If the vehicle decreases the scan frequency during engine-off conditions, then the power consumption is reduced, but the connection response time increases
Solution Approach 1:
The system dynamically adjusts scan frequency based on whether the engine is on or off. When the engine is off, a lower scan frequency reduces power consumption from the battery, while when the engine is on, the higher frequency ensures faster connection response. This dynamic adaptation resolves the time-power tradeoff
Solution Approach 2:
The patent implements periodic channel scanning with different periods depending on engine status. During engine-off conditions, scanning occurs at longer intervals to conserve battery power, while during engine-on conditions, scanning occurs more frequently to ensure rapid connection establishment, thus managing the periodic action according to power availability
3Speed
If the vehicle increases the scan frequency during engine-on conditions, then the connection speed is improved, but the power consumption increases
Solution Approach 1:
The system dynamically adjusts scan frequency based on engine status. When the engine is on, the higher scan frequency enables faster connection establishment without significantly impacting overall power consumption since the engine is running. When the engine is off, the system automatically reduces frequency to conserve battery power, thus dynamically resolving the speed-power tradeoff
Data Source
AI summary
A vehicle communication system includes a connection quality module and a channel scan frequency module. The connection quality module determines that a vehicle is out-of-range (OOR) from a host when a connection quality between the vehicle and the host is below a predetermined connection quality threshold. The channel scan frequency module controls a frequency of attempts by the vehicle to connect to the host when the vehicle is OOR based on at least one of whether an engine is on and a movement rate of the vehicle.