EV Power Supply Sub Storage Switching Control
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Solution Overview
Problem
In electrically powered vehicles with a main power storage device and multiple sub power storage devices, the existing power supply systems face challenges in efficiently switching between sub power storage devices during travel, leading to reduced electric energy availability and potential inability to perform electric vehicle (EV) travel when sub power storage devices have low state of charge (SOC).
Innovation Solution
A power supply system incorporating a main power storage device, multiple sub power storage devices, a shared voltage converter, and a switching control device that determines and controls the connection of sub power storage devices based on their SOC, ensuring seamless switching and maintaining overall energy capacity during travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If sub power storage devices are switched during traveling based on SOC, then electric vehicle travel distance is extended, but electric power availability decreases when sub power storage devices have low SOC
Solution Approach 1:
The control device determines the SOC of sub power storage devices before switching occurs and prohibits switching when SOC is below the threshold. This preliminary assessment prevents switching that would result in insufficient electric power availability, ensuring that only switches extending travel distance without compromising power availability are executed.
Solution Approach 2:
The control device continuously monitors the SOC of sub power storage devices and uses this feedback information to make real-time decisions about switching. When SOC falls below the threshold, the control device receives feedback and prohibits switching, thereby maintaining electric power availability while still allowing switches that extend travel distance.
2Quantity of substance
If sub power storage devices are switched during traveling, then energy capacity is utilized more fully, but switching control complexity increases
Solution Approach 1:
The control device uses SOC as a key parameter to determine whether switching should occur. By establishing a threshold value for SOC and comparing actual SOC against this threshold, the control logic becomes systematic and manageable. This parameter-based approach simplifies the control complexity while ensuring full utilization of stored electric energy across multiple sub power storage devices.
3Quantity of substance
If multiple sub power storage devices are used sequentially, then overall energy capacity increases, but risk of power interruption increases
Solution Approach 1:
The control device performs preliminary checks of SOC before allowing switching between sub power storage devices. By identifying and preventing switches that would result in low SOC operation, the system proactively avoids power interruption risks. This preliminary anti-action ensures that switching only occurs when it will not compromise power supply continuity, thereby maintaining reliability while increasing overall energy capacity.
Solution Approach 2:
The control device continuously monitors SOC and uses this feedback to prevent switching that would cause power interruption. When SOC falls below the threshold, the control device receives feedback and prohibits switching, ensuring that the newly connected sub power storage device has sufficient energy capacity. This feedback mechanism maintains power supply continuity while allowing sequential use of multiple devices to increase overall energy capacity.
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 solution enables appropriate connection switching between sub power storage devices, optimizing electric vehicle travel distance and ensuring continuous power supply by maintaining the overall energy capacity of the power storage devices, even when individual sub power storage devices have low SOC.
Implementation Method 1
a first voltage converter provided between the electric power feeding line and the main power storage device, and converting voltage between the both bidirectionally
Implementation Method 2
a second voltage converter provided between the plurality of sub power storage devices and the electric power feeding line, and converting voltage between one of the plurality of sub power storage devices and the electric power feeding line bidirectionally
Data Source
AI summary
A power supply system includes a main power storage device and a plurality of sub power storage devices. A converter is connected to selected one of the sub power storage devices to convert voltage between the selected sub power storage device and an electric power feeding line bidirectionally. When the travel mode of an electrically powered vehicle is an EV mode, switching processing of a sub power storage device is performed based on the selected sub power storage device's SOC. On the other hand, when the travel mode of the electrically powered vehicle is an HV mode, control under which the SOC of the main power storage device and the plurality of sub power storage devices as a whole is kept constant is carried out, and switching of the selected sub power storage device is prohibited.