Vehicle Load Management Using Presence-Aware Priority Shedding
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Solution Overview
Problem
Existing automotive power systems struggle to efficiently manage high current loads, particularly when multiple loads with the same priority are connected, leading to potential power shortages and inefficient load shedding.
Innovation Solution
A vehicle power system with controllers that dynamically adjust power supply to loads based on current magnitude, prioritizing load shedding or power reduction for loads with the same priority, and utilizing pulse width modulation to manage power distribution efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power is supplied to multiple loads with the same priority when current magnitude exceeds the predefined threshold, then all loads can operate, but the system may experience power shortages and unreliable operation
Solution Approach 1:
The patent implements dynamic load management by continuously monitoring current magnitude and adjusting power distribution in real-time. When current exceeds the predefined threshold, the controller dynamically shifts loads from high priority to low priority status, enabling the system to adapt to changing power conditions and maintain reliable operation of critical loads.
Solution Approach 2:
The patent segments loads into different priority groups (high priority and low priority) to manage power distribution effectively. This segmentation allows the system to differentiate between critical and non-critical loads, ensuring that essential functions maintain power supply while non-essential loads are shed or operated with reduced power during high current conditions.
2Productivity
If load shedding is implemented without considering presence patterns, then power threshold is maintained, but load management efficiency is reduced
Solution Approach 1:
The patent incorporates feedback mechanisms by monitoring whether loads are present at the same time as other loads. This information feeds back into the priority assignment logic, allowing the controller to make informed decisions about load shedding. The system learns from operational patterns and adjusts priority assignments accordingly, improving power management efficiency without requiring overly complex control logic.
3Power
If all loads are operated at full power regardless of current magnitude, then maximum performance is achieved, but power shortages occur when current exceeds the predefined threshold
Solution Approach 1:
The patent changes the operational parameters of loads based on current magnitude. When current is within acceptable limits, loads operate at full power for maximum performance. When current exceeds the predefined threshold, the system changes parameters by shedding low priority loads or operating them with reduced power, thereby maintaining system stability and preventing power shortages while preserving maximum performance for high priority loads.
Data Source
AI summary
Responsive to a magnitude of current associated with power from a vehicle being supplied to loads having a same priority approaching or exceeding a predefined threshold and indication that one of the loads has not been present at a same time as other of the loads, one or more controllers may shed or operate with reduced power the one of the loads before shedding or operating with reduced power the other of the loads.