Compressor Position Regulator for Turbocharged Engine Efficiency
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Solution Overview
Problem
Existing methods for regulating supercharged internal combustion engines, particularly with compressor and turbine bypass valves, face inefficiencies in managing compressor pumping and handling changes in ambient conditions, such as altitude and temperature, which affect engine performance and efficiency.
Innovation Solution
A regulating method that adjusts the operating point of the compressor in a compressor characteristic map using a compressor position regulator and a correction regulator, with actuating variables for the compressor and turbine bypass valves, to optimize efficiency by defining regions of optimal operating points and responding to throttle valve deviations and air mass regulation, ensuring continuous transition and handling various conditions with minimal data handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stress or pressure
If a single-stage supercharging concept with a small exhaust gas turbocharger is used, then the charging pressure excess is reduced by the compressor bypass valve and turbine bypass valve, but compressor pumping in low rotational speed range and compressor stopping in upper rotational speed range cannot be avoided
Solution Approach 1:
The regulation task is segmented between two separate bypass valves: the compressor bypass valve handles charging pressure reduction primarily, while the turbine bypass valve manages compressor operating stability. This division allows each valve to specialize in one function, preventing the trade-off between pressure control and compressor stability.
2Device complexity
If pure throttle valve regulation is used to reduce excess charging pressure, then the system is simple, but it is not possible to avoid compressor pumping in low rotational speed range and compressor stopping in upper rotational speed range
Solution Approach 1:
The compressor bypass valve acts as an intermediary element between the compressor and the intake system. By providing an alternative path for compressed air, it mediates the pressure regulation task without requiring the throttle valve to operate in its ineffective range, thus preventing compressor pumping and stopping while maintaining system complexity at an acceptable level.
3Stress or pressure
If the operating point is adjusted only by compressor bypass valve opening, then the charging pressure is reduced, but the degree of efficiency is not optimized
Solution Approach 1:
The system changes multiple parameters simultaneously: both the compressor bypass valve opening degree and the turbine bypass valve opening degree are adjusted together. This coordinated parameter change allows the operating point to be positioned not only at the required charging pressure but also on the efficiency characteristic curve, optimizing both pressure control and energy efficiency.
4Adaptability or versatility
If a wide compressor characteristic map is required for single-stage supercharging, then the system must handle various operating conditions, but managing compressor pumping and stopping across the entire range becomes difficult
Solution Approach 1:
The combination of compressor bypass valve and turbine bypass valve creates a universal regulation system that handles multiple functions: charging pressure control, compressor stability maintenance, and efficiency optimization. This multi-functional approach covers the entire compressor characteristic map without requiring separate specialized systems for different operating ranges, managing complexity effectively.
Data Source
AI summary
A regulating method for a charged internal combustion engine, wherein an operating point of the compressor is adjusted in a compressor map by a compressor position regulator based on a throttle valve regulation deviation in that both a first manipulated variable for actuating the compressor bypass valve as well as a second manipulated variable for actuating the turbine bypass valve are calculated by the compressor position regulator. The operating point of the compressor is corrected by a correction regulator on the basis of an air mass regulation deviation in that both a first correction variable for correcting the first manipulated variable as well as a second correction variable for correcting the second manipulated variable are calculated by the correction regulator.