Vehicle Power Source Voltage Stabilization
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Solution Overview
Problem
Existing vehicle power sources face challenges in stabilizing power supply voltage, particularly due to varying power consumption by large-capacity devices, which can lead to instability and excessive discharge of batteries.
Innovation Solution
A vehicle power source system incorporating a generator motor, two power storage batteries (lithium ion and lead batteries) connected in parallel, with a conduction switch and switch controller that dynamically switches between coupling and decoupling the batteries based on state of charge and discharge thresholds to maintain stable voltage supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If both lithium ion battery and lead battery are coupled in parallel to the generator motor for regenerative power generation, then the regenerative power and energy efficiency are improved, but the power supply voltage stability deteriorates due to varying power consumption by large-capacity devices
Solution Approach 1:
The conduction switch dynamically changes between conductive and cut-off states based on real-time conditions (generator motor powered state or lead battery discharge rate). This dynamic switching adapts the battery configuration from parallel (for high energy efficiency) to series (for voltage stability), resolving the contradiction between energy efficiency and voltage stability
Solution Approach 2:
The system changes the electrical connection parameter (parallel vs series configuration) between the two batteries through the conduction switch. When voltage stability is needed, it switches from parallel to series connection, thereby changing the system's electrical parameters to maintain stable power supply voltage under varying load conditions
2Stability of the object's composition
If the conduction switch is changed from conductive state to cut-off state when generator motor is controlled in powered state, then the power supply voltage stability is improved, but the device complexity increases due to additional control logic
Solution Approach 1:
The switch controller pre-establishes control rules for when to switch the conduction state (when generator motor is controlled in powered state or when lead battery discharge exceeds threshold). By defining these conditions in advance, the system achieves voltage stability without requiring complex real-time decision-making logic
3Stability of the object's composition
If the conduction switch is changed from cut-off state to conductive state when lead battery discharges in excess of threshold, then the power supply voltage stability is improved, but the loss of time increases due to switching operations
Solution Approach 1:
The switch controller continuously monitors the lead battery's discharge rate and provides feedback to determine when to switch the conduction state. When discharge exceeds the threshold, the feedback loop triggers the switch to transition from cut-off to conductive state, maintaining voltage stability with minimal delay through continuous monitoring
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
The system effectively stabilizes power supply voltage by ensuring that the lithium ion battery is charged when necessary and discharged only when required, reducing the load on the engine and enhancing energy efficiency, while preventing excessive discharge of the lead battery.
Implementation Method 1
a generator motor 16 configured to be coupled to an engine 12
Implementation Method 2
a first power storage 31 configured to be coupled to the generator motor 16 and a second power storage 32 coupled, in parallel with the first power storage 31, to the generator motor 16
Data Source
AI summary
A vehicle power source includes a generator motor coupled to an engine, a first power storage, a second power storage, a conduction switch, and a switch controller. The first and the second power storages are coupled, in parallel, to the generator motor. The conduction switch is subject to change between a conductive state and a cut-off state of the generator motor and the second power storage. The switch controller changes the conduction switch from the conductive state to the cut-off state, on a condition that the generator motor is controlled in a powered state. The switch controller changes the conduction switch from the cut-off state to the conductive state, on a condition that the second power storage discharges in excess of a threshold, with the conductive switch changed to the cut-off state.