Coordinated Air Charging Control for Engine Transients
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Solution Overview
Problem
Conventional control strategies for air charging systems in internal combustion engines are inaccurate and require extensive calibration 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 used to determine actuator positions, compensating for interactions between actuators, thereby allowing simultaneous and accurate control of the air charging system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separated and uncoordinated control strategies are used for actuators, then control simplicity is maintained, but control accuracy deteriorates during fast transients
Solution Approach 1:
The patent merges the control of multiple actuators (EGR valve, VGT, intake valve) into a single coordinated control framework. The control unit simultaneously adjusts all actuators based on their interdependent effects on intake manifold pressure, oxygen concentration, and exhaust manifold pressure, rather than controlling them separately. This unified approach captures the mutual interactions between actuators and achieves accurate transient response while maintaining practical control simplicity through integrated decision-making.
2Device complexity
If separated control strategies are implemented, then device complexity is reduced, but calibration requirements increase
Solution Approach 1:
The patent implements a universal coordinated control strategy that handles multiple actuators and operating conditions through a single integrated framework. The control unit uses a unified set of equations and logic that applies across all operating points, eliminating the need for separate calibration procedures for different actuator combinations. This multi-functional control approach reduces calibration effort while maintaining comprehensive coverage of engine operating conditions.
3Ease of operation
If uncoordinated actuator control is used, then control implementation is simplified, but transient response accuracy deteriorates
Solution Approach 1:
The patent employs feedback control where the control unit continuously monitors the actual effects of actuator adjustments on intake manifold pressure, oxygen concentration, and exhaust manifold pressure. Based on this feedback, the control unit dynamically adjusts the actuators to achieve the desired transient response. The feedback mechanism enables accurate compensation for actuator interactions and ensures precise control during fast transients while keeping the implementation practical through automated real-time adjustment.
Data Source
AI summary
A method of controlling the operation of an air charging system is disclosed. A plurality of output parameters of the air charging system are monitored. An error between each one of the monitored output parameters and a target value thereof is calculated. Each one of the calculated errors is applied to a linear controller that yields a virtual input which is used to calculate a plurality of input parameters for the air charging system. Each one of the input parameters is used to determine the position of a corresponding actuator of the air charging system and operate of 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 each one of the virtual inputs is in a linear relation with only one of the output parameters.