Hybrid Vehicle Power Supply Voltage Control via Dynamic Switching
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Solution Overview
Problem
Hybrid vehicles face challenges in controlling power supply voltage between electric driving and hybrid driving modes, with existing systems failing to optimize voltage settings based on driving modes and power supply connection states.
Innovation Solution
A control apparatus for hybrid vehicles that includes a main power supply, sub-power supplies, a switching device, and a control system to manage the connection of sub-power supplies to a rotating electric machine, allowing for optimal voltage setting during hybrid driving while ensuring power supply capacity in electric driving mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple sub-power supplies are connected to the rotating electric machine during electric driving control, then power supply capacity is ensured, but device complexity and control difficulty increase during hybrid driving control
Solution Approach 1:
The patent applies dynamics by making the connection configuration of power supplies adjustable based on driving mode. During electric driving control, multiple sub-power supplies are connected to ensure sufficient power supply capacity. During hybrid driving control, the system dynamically switches to connect only the main power supply, reducing complexity. This dynamic reconfiguration resolves the contradiction between ensuring power supply capacity and reducing control complexity.
Solution Approach 2:
The patent segments the power supply system into a main power supply and multiple sub-power supplies, with different connection strategies for different driving modes. The switching device separates the connection paths, allowing independent control of main and sub-power supply connections. This segmentation enables the system to use only the necessary power supplies for each mode, reducing unnecessary complexity while maintaining required capacity.
2Reliability
If output voltage of sub-power supplies is set high to ensure power supply capacity, then power supply capacity is improved, but power loss increases during hybrid driving control
Solution Approach 1:
The patent applies parameter changes by adjusting the output voltage of sub-power supplies based on driving mode. During electric driving control, sub-power supplies operate at high output voltage to ensure sufficient power supply capacity. During hybrid driving control, the system changes the parameter by setting sub-power supply output voltage to a lower value or disconnecting them, thereby reducing power loss while the main power supply maintains necessary capacity.
Solution Approach 2:
The patent uses partial action by having only the main power supply operate at high output voltage during hybrid driving control, while sub-power supplies are disconnected or operate at reduced voltage. This partial operation ensures that power supply capacity is maintained through the main power supply without the excessive power loss that would occur if all power supplies operated at high voltage simultaneously.
3Reliability
If switching device connects all sub-power supplies during electric driving control, then power supply capacity is ensured, but voltage optimization becomes difficult during hybrid driving control
Solution Approach 1:
The patent applies dynamics by implementing dynamic switching control that adapts the power supply connection configuration to the driving mode. The switching device is controlled to connect all sub-power supplies during electric driving control to ensure capacity, and to disconnect them during hybrid driving control to enable voltage optimization. This dynamic adaptation resolves the contradiction between ensuring capacity and enabling voltage control flexibility.
Solution Approach 2:
The patent segments the power supply connection control into independent main power supply control and sub-power supply control through the switching device. This segmentation allows the system to optimize voltage settings independently for each power supply group based on driving mode, providing the flexibility needed for voltage optimization during hybrid driving while maintaining capacity during electric driving.
Data Source
AI summary
In a hybrid vehicle including a master power supply always connected to an MG (Motor-Generator) during driving and a first slave power supply and a second slave power supply capable of switching of a connection state with the MG during driving, an ECU connects one of the first slave power supply and the second slave power supply and executes EV (“Electric Vehicle”) driving control with the master power supply and one of the slave power supplies, until both of the State of Charge (“SOC”) of the first slave power supply and the State of Charge of the second slave power supply drop below a threshold value. On the other hand, when both SOCs drop below the threshold value, the ECU disconnects both of the first slave power supply and the second slave power supply and executes HV (“Hybrid Vehicle”) driving control only with the master power supply.