Air Charging System MIMO Control for Transient Accuracy
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Solution Overview
Problem
Conventional control strategies for air charging systems in internal combustion engines suffer from low accuracy and high calibration efforts due to uncoordinated control of actuators, leading to suboptimal performance and emissions during fast transients.
Innovation Solution
A coordinated control strategy using a multi-input multi-output (MIMO) feedback linearization approach, where output parameters are monitored, errors are calculated, and virtual inputs are applied to determine actuator positions, reducing calibration needs and improving transient response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separated and uncoordinated control strategies are used for actuators, then each actuator can be operated independently, but control accuracy deteriorates during fast transients and calibration effort increases
Solution Approach 1:
The patent merges the control of multiple actuators into a single coordinated control strategy. The electronic control unit simultaneously adjusts multiple actuators (intake valve actuator, EGR valve actuator, VGT actuator) based on their interdependent effects on output parameters, rather than controlling them independently. This coordinated approach resolves the contradiction by maintaining operational flexibility while achieving accurate control during transients through unified control logic.
Solution Approach 2:
The patent implements feedback control by continuously monitoring output parameters (intake manifold pressure, oxygen concentration, exhaust manifold pressure) and using this information to adjust actuator positions. The control strategy calculates errors between actual and target parameter values and uses these errors to coordinate actuator adjustments, ensuring accurate response during transients while maintaining the ability to operate each actuator independently when needed.
2Device complexity
If separated and uncoordinated control strategies are used for actuators, then control logic is simple, but calibration effort increases significantly
Solution Approach 1:
The patent creates a universal control strategy that handles multiple actuators and output parameters through a single coordinated framework. The electronic control unit uses a unified control logic that can manage any combination of actuators and their interdependent effects, eliminating the need for separate calibration procedures for each actuator. This multi-functional approach reduces overall calibration effort while maintaining control logic that is both simple and adaptable.
3Measurement precision
If coordinated control of actuators is implemented, then control accuracy during transients improves, but control system complexity increases
Solution Approach 1:
The patent segments the coordinated control into manageable components by monitoring specific output parameters (intake manifold pressure, oxygen concentration, exhaust manifold pressure) and adjusting specific actuators based on their individual effects. This segmentation allows the complex coordinated control to be broken down into discrete, manageable control actions, reducing the perceived complexity while maintaining accuracy during transients.
Data Source
AI summary
A method and apparatus is disclosed to control the operation of an air charging system of an internal combustion engine. A plurality of output parameters of the air charging system are monitored. An error is calculated between the monitored output parameters and a target value thereof. The calculated errors are applied to a linear controller that yields a virtual input used to calculate a plurality of input parameters for the air charging system. The input parameters is used to determine the position of a corresponding actuator of the air charging system for operating the actuators according to the determined position thereof. The inputs parameters are calculated with a non-linear mathematical model of the air charging system configured such that the virtual inputs are in a linear relation with only one of the output parameters and vice versa.