Variable Turbine Boost Pressure Control for Surge Prevention
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Solution Overview
Problem
Conventional supercharger systems face challenges in setting an appropriate turbine opening degree to prevent compressor surge during vehicle deceleration, leading to abnormal noise and vibrations due to inadequate adaptability to varying operating conditions.
Innovation Solution
A boost pressure control method and device that calculates a target turbine opening area using a physical model based on a throttle expression, setting a target pressure ratio to prevent compressor surge, and adjusting the turbine opening degree accordingly to match the target opening area, ensuring stable and reliable boost pressure control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a specified opening degree or map-based opening degree is used to prevent compressor surge, then compressor surge prevention is improved, but adaptability to varying operating conditions deteriorates
Solution Approach 1:
The turbine opening degree is changed from a fixed specified value or map-based value to a dynamically calculated value that adapts to real-time operating conditions. The control device calculates the target turbine opening area based on current engine operating parameters, allowing the system to adapt to varying conditions while preventing compressor surge.
Solution Approach 2:
The invention changes the parameter of turbine opening degree from a predetermined static value to a dynamically calculated value based on operating conditions. By calculating the target turbine opening area using the arithmetic expression and adjusting the turbine opening degree accordingly, the system achieves both surge prevention and adaptability to varying operating conditions.
2Reliability
If a specified opening degree is used to prevent compressor surge, then surge prevention is improved, but device complexity and data requirements increase
Solution Approach 1:
The invention extracts the essential parameters needed for turbine opening degree calculation from complex map data structures. By using an arithmetic expression that directly calculates the target turbine opening area based on operating conditions, the system eliminates the need for extensive pre-prepared maps covering every conceivable operating condition, thereby reducing device complexity.
Solution Approach 2:
The invention replaces the mechanical approach of using pre-defined maps and lookup tables with a computational approach using an arithmetic expression. This substitution allows the system to calculate the appropriate turbine opening degree on-the-fly based on current operating conditions, eliminating the need for extensive data mapping infrastructure.
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 approach allows for real-time adjustment of the turbine opening degree to prevent compressor surge, reducing the occurrence of abnormal noise and vibrations, and eliminates the need for extensive data mapping, thereby reducing device costs and improving reliability.
Implementation Method 1
a turbine rotates by using exhaust gas, a compressor that compresses the air is driven by a rotating force of the turbine
Implementation Method 2
a compressor that compresses the air is driven by a rotating force of the turbine
Data Source
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AI summary
A turbine opening degree, at which compressor surge can be prevented, can be set in accordance with an operating condition of a vehicle. In an electronic control unit, if it is determined that an engine is in an operation region to operate a compressor in a surge region, a target turbine opening area for preventing the compressor surge is calculated by using an arithmetic expression that is acquired by replacing a variable turbine with a physical model based on a throttle expression, and an opening of the variable turbine is set at an opening degree that corresponds to the target turbine opening area. In this way, the compressor surge is reliably prevented.