Exhaust Pressure Estimation Using Variable Geometry Turbine
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Solution Overview
Problem
There is a need to accurately estimate exhaust pressure in internal combustion engines without incurring additional costs associated with additional sensing devices, as existing methods rely on exhaust pressure sensors for precise emissions control and EGR system management.
Innovation Solution
A method and apparatus that utilize a control module to monitor sensing devices and execute algorithms to estimate exhaust gas pressure by determining an exhaust pressure ratio based on operating parameters and the opening of a variable geometry intake air compressing device, using either pre-stored tabular parameters or polynomial equations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an exhaust pressure sensor is implemented to determine exhaust pressure, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the mechanical/experimental measurement approach (exhaust pressure sensor) with a computational model that uses existing sensor data (mass flow sensors, temperature sensors, geometric parameters) to calculate exhaust pressure through algebraic equations and lookup tables, eliminating the need for additional pressure sensing hardware
Solution Approach 2:
The patent creates a virtual copy of the exhaust pressure measurement function by using a computational model that replicates the pressure determination capability without requiring physical pressure sensors. The model uses correlated parameters from other sensors to reproduce the pressure information
2Measurement precision
If additional sensing devices are added to monitor exhaust pressure, then measurement precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent uses inexpensive computational algorithms and lookup tables stored in memory to replace expensive physical pressure sensors. The 'disposable' computational model can be implemented through software updates without requiring additional hardware investment
Solution Approach 2:
The patent substitutes mechanical pressure sensing hardware with a computational system that processes data from existing sensors (mass flow, temperature, geometric parameters) to derive exhaust pressure, thereby reducing manufacturing costs while maintaining measurement capability
Data Source
AI summary
A method and apparatus are provided, comprising an internal combustion engine equipped with a variable geometry intake air compressing device and a control module operative to estimate exhaust gas pressure during ongoing engine operation. The control module is adapted to monitor sensing devices of the internal combustion engine, and is adapted to execute algorithms. The method comprises monitoring signal inputs from the sensing devices, and determining operating parameters for exhaust flow and an exhaust pressure of the intake air compressing device. An exhaust pressure ratio is determined based upon the parameters for exhaust flow and the exhaust pressure of the intake air compressing device. An exhaust pressure is determined based upon the exhaust pressure ratio.