Auxiliary Battery-Ultracapacitor Diagnostics During Vehicle Off-Mode
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Solution Overview
Problem
Modern vehicles face increased power demands due to electronic loads, straining lead-acid batteries, and existing methods fail to efficiently assess the state of health and function of energy storage devices like batteries and ultracapacitors, which are crucial for reliable vehicle operation.
Innovation Solution
A vehicle power system with a controller that disconnects and cycles power between an auxiliary battery and an ultracapacitor during off-mode to charge each other, using sensors to monitor parameters and generate data on their state of health and function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If power is cycled between auxiliary battery and ultracapacitor during off-mode to assess state of health, then measurement precision is improved, but loss of time occurs due to requiring vehicle off-mode operation
Solution Approach 1:
The system performs state of health assessments during off-mode periods before the vehicle is needed, preparing diagnostic data in advance. The controller charges the ultracapacitor from the auxiliary battery during off-mode, and uses this time to complete measurements that will be available when the vehicle starts, thus preparing measurements beforehand to avoid delays at startup.
2Reliability
If power networks are disconnected during off-mode cycling, then reliability of assessment is improved by isolating from external influences, but device complexity increases due to requiring disconnection mechanisms
Solution Approach 1:
The controller acts as an intermediary that manages the disconnection and reconnection of power networks. It controls switches to isolate the auxiliary battery and ultracapacitor from the first power network during assessment, creating a controlled environment for reliable measurements. The controller coordinates the timing and sequence of disconnections to ensure accurate state of health evaluation.
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 assessment of energy storage devices' state, ensuring reliable power supply and extending their useful life by isolating and charging these devices, thereby supporting vehicle operation and maintenance.
Implementation Method 1
auxiliary battery and an ultracapacitor
Implementation Method 2
auxiliary battery and an ultracapacitor
Data Source
AI summary
A vehicle has a first power network, a second power network including an auxiliary battery and an ultracapacitor, and a controller. The controller, during an off mode of the vehicle, disconnects the first power network and second power network from each other and cycles power between the auxiliary battery and ultracapacitor.