Electric Power Take-Off With Priority-Based Multi-Device Power Allocation
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Solution Overview
Problem
Existing power take-off systems for hybrid and electric vehicles lack the ability to efficiently prioritize and manage power delivery to multiple external devices based on their specific voltage, current, and variance tolerance requirements from a high-voltage battery, leading to potential inefficiencies and limitations in power distribution.
Innovation Solution
A system utilizing a computing device with a processor and memory, programmed to receive and prioritize requests from external devices, using a high-voltage variable DCDC converter and current regulator to assign power based on priority and variance tolerance, allowing concurrent or sequential power delivery to multiple devices via electric power take-off connectors, with capabilities to operate between 12 volts and 800 volts and exchange data wirelessly or over CAN/Ethernet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power is delivered to multiple external devices simultaneously without prioritization, then all devices can receive power, but power distribution efficiency deteriorates and battery capacity is not optimized
Solution Approach 1:
The power management system segments power delivery by creating distinct priority levels (first priority and second priority circuits). This segmentation allows the system to divide battery capacity allocation into manageable segments based on device importance, enabling efficient power distribution without overwhelming complexity.
Solution Approach 2:
The system dynamically adjusts power delivery based on real-time conditions by monitoring battery state of charge and automatically switching between priority levels. When battery charge is sufficient, both priority circuits can operate; when charge drops below thresholds, the system dynamically redistributes power to maintain operation of critical first-priority devices.
2Reliability
If battery capacity is allocated without considering state of charge thresholds, then all devices can operate, but reliable operation cannot be ensured when battery charge is low
Solution Approach 1:
The system changes operational parameters by establishing state of charge thresholds that trigger different power allocation modes. When battery charge remains above the first threshold, flexible power allocation to multiple devices is maintained. When charge drops below thresholds, the system automatically adjusts parameters to ensure reliable operation of critical devices, thus maintaining reliability while adapting to battery conditions.
Solution Approach 2:
The system takes preliminary action by pre-defining priority levels and state of charge thresholds before power depletion occurs. This advance planning ensures that when battery charge drops, the system can immediately switch to a reliable power allocation mode without delay, maintaining operational reliability while preserving the flexibility to serve multiple devices when conditions permit.
3Reliability
If voltage and current are not regulated according to device requirements, then power delivery is simplified, but device performance and reliability deteriorate
Solution Approach 1:
The system applies local quality by providing customized voltage and current regulation tailored to each priority circuit's specific requirements. First-priority devices receive regulated power according to their specific tolerances, and second-priority devices receive appropriate regulation when battery conditions permit. This localized regulation ensures optimal device performance without requiring a single complex regulation system for all devices.
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
Enables efficient and flexible power distribution to multiple external devices by prioritizing power delivery based on device requirements, optimizing the use of a high-voltage battery's capacity and ensuring reliable operation across varying voltage and current demands.
Implementation Method 1
via a high voltage (HV) variable direct-current to direct-current (DCDC) converter
Implementation Method 2
current regulator to assign power based on priority and variance tolerance
Data Source
AI summary
A system and method for providing electric power take-off from a high-voltage electric battery to a plurality of external devices includes: receiving a first request from a first external device having a first priority for a supply of power from an electric power take-off connector at a first voltage, a first current, and a first variance tolerance; receiving a second request from a second external device having a second priority for supply of power at a second voltage, a second current, and a second variance tolerance; and assigning available power from the high-voltage battery, via a high voltage (HV) variable direct-current to direct-current (DCDC) converter and a current regulator in electrical communication with the high-voltage battery, to the first and second external devices based upon their respective priorities and variance tolerances.