Boost Converter Voltage Control for Vehicle Power Loss Minimization
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Solution Overview
Problem
Existing vehicle systems fail to minimize overall losses, including those of the boost converter, when determining the execution or non-execution of intermittent boosting and target voltage, leading to inefficiencies in power management.
Innovation Solution
A controller is programmed to set and maintain a minimum loss-time boosting voltage that minimizes overall losses by considering losses of the motor and boost converter during both intermittent and continuous operations, allowing for optimal control states based on pre-determined relationships between voltage and current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If target voltage is optimized for boost converter efficiency, then converter performance improves, but motor performance and overall system efficiency may deteriorate
Solution Approach 1:
The patent changes the target voltage optimization criterion from boost converter efficiency alone to overall system efficiency that incorporates both converter and motor performance. The target voltage is determined based on the combined loss characteristics of the boost converter and motor, ensuring that voltage settings optimize the entire powertrain system rather than just the converter component.
Solution Approach 2:
The patent implements a feedback mechanism where the controller continuously monitors both boost converter operation and motor performance, using this combined information to adjust target voltage and intermittent boosting control. This dual-parameter feedback ensures that optimizations in converter efficiency do not compromise motor performance or overall drive characteristics.
2Loss of energy
If intermittent boosting is executed frequently to minimize converter losses, then converter power loss decreases, but system complexity and control difficulty increase
Solution Approach 1:
The patent merges the decision-making criteria for intermittent boosting with motor loss considerations, creating a unified control logic that simultaneously evaluates both converter and motor states. This integration simplifies the control architecture by consolidating what would otherwise be separate control loops into a single coordinated system that makes holistic decisions about boosting execution.
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 reduces overall losses by ensuring the boost converter operates at a target voltage that minimizes energy wastage, improving power efficiency and reducing potential deterioration in drive performance.
Implementation Method 1
a boost converter configured to step up a voltage of the battery and supply the stepped-up voltage to the motor
Data Source
AI summary
An overall loss L during non-execution of intermittent boosting (in ordinary boosting) is calculated from losses L1 and L2 of motors and a loss LC of a boost converter during non-execution of intermittent boosting. The overall loss L during execution of intermittent boosting is calculated from the losses L1 and L2 of the motors and the loss LC of the boost converter during execution of intermittent boosting. A minimum loss-time boosting voltage Vtmp at which the overall loss L provides a minimum loss Ltmp is set to a target voltage VH*. The boost converter is then controlled in a control state corresponding to the minimum loss-time boosting voltage Vtmp.