Electric Vehicle Control Apparatus Voltage Stabilization
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Solution Overview
Problem
Existing control apparatuses for electric vehicles struggle to stabilize voltage on the power supply line effectively, especially when the balance of power between AC motors varies, leading to potential damage to connected electronic equipment, and current solutions either increase costs or are difficult to implement due to the need for high-performance voltage converters and large capacitors.
Innovation Solution
A control apparatus comprising a power conversion unit, motor driving unit, system voltage stabilization control, conversion power control, conversion voltage control, and a selector unit, which selectively executes conversion power or voltage control to stabilize system voltage, allowing for efficient voltage management without high-performance components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a voltage boosting converter with better performance and a smoothing capacitor with a larger capacitance are used to stabilize voltage, then voltage stabilization is improved, but cost increases
Solution Approach 1:
The patent implements dynamic control of the voltage boosting converter by switching between voltage control mode and power control mode based on real-time operating conditions. The control mode is dynamically adjusted according to the balance of power between AC motors, allowing the system to adapt to varying load conditions without requiring oversized components, thus reducing cost while maintaining voltage stabilization.
Solution Approach 2:
The patent changes the control parameter of the voltage boosting converter from fixed voltage control to variable control mode (switching between voltage control and power control). By changing the control parameter based on operating conditions, the system achieves effective voltage stabilization with standard-sized components rather than requiring high-performance or large-capacity components.
2Reliability
If a voltage boosting converter with better performance is used to stabilize voltage, then voltage stabilization is improved, but device size increases
Solution Approach 1:
The system dynamically switches between voltage control mode and power control mode based on the balance of power between AC motors. This dynamic adaptation allows the voltage boosting converter to operate efficiently under varying conditions, achieving effective voltage stabilization with a compact design rather than requiring a large high-performance converter.
Solution Approach 2:
By changing the control parameter from fixed voltage control to variable control mode, the patent enables the voltage boosting converter to maintain effective voltage stabilization with reduced component size. The adaptive control allows standard-sized converters to perform optimally across different operating conditions.
3Reliability
If power control is executed during voltage control, then voltage stabilization is improved, but control complexity increases
Solution Approach 1:
The patent implements dynamic mode switching between voltage control and power control based on real-time detection of AC motor power balance. The selector unit automatically determines the appropriate control mode, simplifying the control architecture while achieving improved voltage stabilization without requiring complex simultaneous multi-mode control.
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 solution effectively stabilizes system voltage without requiring expensive or large-capacity components, meeting the requirements of small size and low cost, while maintaining the balance of power between AC motors during varying operating conditions.
Implementation Method 1
a voltage boosting converter for raising a voltage generated by a DC power supply
Implementation Method 2
a smoothing capacitor connected to the power supply line smoothes the voltage appearing on the power supply line
Implementation Method 3
a component for converting the raised DC voltage appearing on the power supply line into an AC voltage for driving one of the AC motors
Data Source
AI summary
Right after a system operation start but before a smoothing capacitor has been sufficiently pre-charged, conversion voltage control is executed to control a voltage boosting converter so that a system voltage is first raised to a target value. After the smoothing capacitor has been pre-charged, the conversion voltage control is changed over to conversion power control to control the output power of the voltage boosting converter, so that the output power of the voltage boosting converter is brought into agreement with a command value. While the conversion power control is being executed, system voltage control by operating the input power to the MG unit is prohibited.