Power Source Control Device for Automotive Emergency Load Reliability
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Solution Overview
Problem
In automotive power source systems, when the power supply from a main battery is interrupted, the emergency load may be brought into an OFF state due to insufficient power generation by the alternator, leading to potential system failures and unreliable power delivery.
Innovation Solution
A power source control device and battery pack configuration that includes a charge/discharge switch between a secondary power source and a power generator, ensuring that the power generator remains connected to the secondary power source even when the main power source is interrupted, maintaining power supply to critical loads by restricting the power supplied to the emergency load from dropping below a reset threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply from the main battery is interrupted, then the system can isolate faults or perform maintenance, but the emergency load may be brought into an OFF state due to insufficient power generation by the alternator
Solution Approach 1:
The control device predicts the power generation amount of the alternator in advance before main battery interruption occurs. Based on this prediction, it determines whether the secondary power source needs to be charged and controls the charge/discharge switch accordingly. This preliminary action ensures that the emergency load will have sufficient power supply even when the main battery is interrupted.
Solution Approach 2:
The system charges the secondary power source in advance by controlling the charge/discharge switch to connect the power generator to the secondary power source before main battery interruption. This creates a power buffer that cushions against the potential power deficit, preventing the emergency load from shutting down when the main battery fails.
2Use of energy by moving object
If the alternator power generation is insufficient, then the system can operate with reduced power consumption, but the emergency load cannot maintain operation above the reset threshold
Solution Approach 1:
The control device dynamically adjusts the connection state of the charge/discharge switch based on real-time conditions including alternator power generation amount, secondary power source charge level, and emergency load requirements. This dynamic control optimizes power distribution to maintain emergency load operation while adapting to varying power generation capabilities.
Solution Approach 2:
The control device continuously monitors the power generation amount of the alternator, the charge/discharge state of the secondary power source, and the power supply status of the emergency load. Based on this feedback, it adjusts the charge/discharge switch control to maintain the emergency load above the reset threshold while managing overall power consumption.
3Quantity of substance
If the charge/discharge switch is controlled to connect the power generator to the secondary power source, then the secondary power source can be charged, but the power supply to the emergency load may be insufficient when the main battery is interrupted
Solution Approach 1:
The control device determines the necessary charge amount for the secondary power source in advance by predicting alternator power generation and comparing it with the emergency load power requirements. It then controls the charge/discharge switch to charge the secondary power source to this predetermined level before main battery interruption, ensuring sufficient power supply without over-charging.
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 configuration ensures continuous power supply to emergency loads by maintaining the power generator's connection to the secondary power source, preventing the emergency load from being shut down and ensuring reliable operation even when the main power source is interrupted.
Implementation Method 1
a power generator (130) electrically connected to each of the first power source and the second power source
Implementation Method 2
a second power source (10) electrically connected to each of the second electrical load and the power generator
Data Source
AI summary
A power source system includes a first power source, a power generator, a first electrical load, a second electrical load, a second power source, and a charge/discharge switch provided between the second power source and the power generator. The charge/discharge switch is controlled into a closed state to electrically connect the power generator to the second power source, when an amount of charge of the second power source is less than a charge request threshold, the power generator is in a power generating state, and an amount of power generated by the power generator is equal to or more than a total power requirement as a total sum of respective amounts of power required by the second power source, the first electrical load, and the second electrical load.