Engine Injection Profile Control via Dynamic Air System Correction
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Solution Overview
Problem
Internal combustion engines face challenges in adapting fuel injection profiles to dynamic air system conditions during transient operation, leading to increased pollutant emissions due to delays in air system state variables following setpoint values.
Innovation Solution
A method that adjusts fuel injection parameters using a correction injection parameter model, which accounts for dynamic air system behavior by optimizing injection profiles to maintain constant engine torque and reduce emissions, employing a combination of physical and data-based models, such as Gaussian process regression, to invert combustion cycle models and adjust injection parameters accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the injection profile is changed immediately depending on the requested load, then the engine responds quickly to load changes, but the injection profile is not ideally adapted to the delayed changes in air system conditions, leading to increased pollutant emissions
Solution Approach 1:
The patent applies preliminary action by determining correction injection parameters based on a correction injection parameter model that predicts air system state variables before actual measurements are available. This allows the injection profile to be pre-adjusted to compensate for the inherent delay in air system response, ensuring optimal combustion conditions are achieved without increasing pollutant emissions
Solution Approach 2:
The patent implements feedback by using a correction injection parameter model that continuously receives actual measurements of air system state variables (such as intake manifold pressure and temperature) and adjusts the injection parameters accordingly. This closed-loop control ensures the injection profile remains adapted to actual air system conditions, reducing pollutant emissions while maintaining responsive engine operation
2Object-generated harmful factors
If the injection profile is adapted to dynamic air system conditions, then pollutant emissions are reduced, but the device complexity increases due to the need for correction injection parameter models and additional calculations
Solution Approach 1:
The patent applies copying by creating a virtual model (correction injection parameter model) that replicates the behavior of the physical air system. This model copies the dynamic characteristics of the air system, allowing the control system to predict and compensate for delays without adding complex physical sensors or actuators, thus reducing emissions while limiting complexity growth
Solution Approach 2:
The patent substitutes mechanical complexity with computational processing by replacing potential additional physical measurement devices and complex hardware modifications with a correction injection parameter model that performs calculations based on existing sensor data. This approach reduces emissions through sophisticated control algorithms while avoiding the complexity of additional mechanical components
Data Source
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Figure 3
AI summary
The invention relates to a method for operating an internal combustion engine (1) through specification of an injection profile which is defined by adapted injection parameters (u* e,k ), having the following steps: – determining steady-state injection parameters (u e,k ) on the basis of a predefined steady-state injection profile characteristic map; – determining corrective injection parameters (Δu e,k ) on the basis of a predefined corrective injection parameter model, which provides corrective injection parameters (Δu e,k ) as a function of one or more state variables of an air supply system (3) and/or exhaust-gas discharge system (4) of the internal combustion engine (1); – applying the corrective injection parameters (Δu e,k ) to the steady-state injection parameters (u e,k ) in order to obtain the adapted injection parameters (u* e,k ).