Hybrid Power Source for Vehicle Engine Restart
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Solution Overview
Problem
In vehicles equipped with idle stop and regenerative power generation systems, the lead acid battery's voltage drop during starter activation affects engine restart reliability, particularly during driving conditions, due to degradation and potential internal short circuits, making it difficult to maintain performance and ensure reliable engine reactivation.
Innovation Solution
A power source system that combines a lead acid battery with a hybrid power source, including a secondary battery and a capacitor, connected in parallel, with a power source controlling portion to manage power distribution between the batteries and the starter, allowing the lead acid battery to supply power to general loads and the hybrid power source to supply power to the starter during engine restarts, thereby enhancing reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a lead acid battery is used to supply power to the starter for engine starting, then the battery can provide sufficient starting power, but the battery voltage largely drops during starter activation which influences starter operation and reduces engine restart reliability
Solution Approach 1:
The power supply system is segmented into two independent power sources: a lead acid battery connected to the starter for engine starting, and a secondary battery connected to general loads. This segmentation allows each battery to operate independently without interfering with each other's performance, preventing voltage drops from affecting starter operation while maintaining engine restart reliability
Solution Approach 2:
The general load power supply function is extracted from the lead acid battery and assigned to a secondary battery. This extraction removes the burden of general load power consumption from the lead acid battery, ensuring that the battery maintains sufficient voltage during starter activation and improving engine restart reliability
2Quantity of substance
If the lead acid battery supplies power to both the starter and general loads, then the battery must have large capacity, but this increases battery degradation and internal short circuit risk
Solution Approach 1:
The battery system is segmented into two separate batteries with distinct functions: the lead acid battery is dedicated to starter power supply, while the secondary battery handles general loads. This segmentation allows the lead acid battery to maintain appropriate capacity without excessive load, reducing degradation and internal short circuit risk while still providing sufficient starting power
Solution Approach 2:
The general load power supply function is extracted from the lead acid battery and assigned to a secondary battery. This extraction reduces the overall capacity requirement for the lead acid battery, thereby reducing degradation and internal short circuit risk while maintaining sufficient capacity for engine starting
3Productivity
If the lead acid battery supplies power to general loads during engine operation, then the battery undergoes repeated charge-discharge cycles, but this causes degradation and reduces battery life
Solution Approach 1:
The general load power supply function is extracted from the lead acid battery and assigned to a secondary battery. This extraction eliminates repeated charge-discharge cycles from the lead acid battery during engine operation, thereby reducing degradation and extending battery life while the secondary battery maintains power supply capability for general loads
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 improves engine restart reliability by reducing the load on the lead acid battery, suppressing degradation, and ensuring stable power supply to the starter, even under low temperature conditions, while minimizing energy loss and extending battery life.
Implementation Method 1
a hybrid power source connecting a secondary battery except for the lead acid battery and a capacitor
Implementation Method 2
a hybrid power source connecting a secondary battery except for the lead acid battery and a capacitor
Data Source
AI summary
A hybrid power source connects a secondary battery and an EDLC. A first switch connects the hybrid power source and a lead acid battery in parallel. A power source controlling portion controls power supply to the hybrid power source and the lead acid battery. The hybrid power source is connected to a starter for starting an engine for a vehicle, and also connected to an electric device except for the starter through the first switch, and the lead acid battery is connected to the electric device, and also connected to the starter through the first switch.