Lambda Control Trim Regulation with Dynamic Amplification
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Solution Overview
Problem
Current internal combustion engine exhaust gas systems face challenges in rapidly adapting to sudden changes in system deviations, leading to increased emissions due to slow correction by the I regulator component and potential overshooting in fuel/air mixture adjustments.
Innovation Solution
A method is introduced that adjusts the I regulator component based on thresholds exceeded by the P component, switching to modes with increased regulator amplification factors to prevent overshooting and ensure precise fuel/air mixture control, allowing for rapid adaptation without sudden adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the I regulator component is used to correct system deviation slowly, then the fuel/air mixture control is stable, but the adaptation speed to sudden changes is slow and emissions increase
Solution Approach 1:
The patent applies dynamics by making the regulator amplification factors adjustable rather than fixed. The control system dynamically switches between different amplification factors (first, second, and third amplification factors) based on the current operating conditions and detected system deviations, allowing the I regulator component to adapt its response speed while maintaining stability.
Solution Approach 2:
The patent changes the parameter of regulator amplification factors to resolve the contradiction. By varying the amplification factors of the P and I regulator components based on threshold conditions, the system can speed up adaptation to sudden changes when needed while maintaining stable control during normal operation, thus resolving the trade-off between stability and adaptation speed.
2Speed
If the P component is used to correct system deviation rapidly, then the adaptation speed is fast, but overshooting occurs in the fuel/air mixture adjustment
Solution Approach 1:
The system dynamically adjusts the amplification factors of the P and I regulator components based on real-time conditions. When sudden changes are detected, the system switches to higher amplification factors to achieve rapid adaptation. When normal operation is detected, the system uses standard amplification factors to maintain precision and avoid overshooting, thus resolving the contradiction between speed and precision.
Solution Approach 2:
The control system periodically evaluates the operating conditions and switches between different regulator modes (first, second, and third amplification factors) based on detected thresholds. This periodic switching allows the system to achieve rapid adaptation when needed while maintaining precision during normal operation, resolving the contradiction between adaptation speed and control precision.
3Speed
If the I component is adjusted suddenly to correct deviation, then the correction speed is fast, but the non-linearity of the characteristic curve causes rough neutral position achievement
Solution Approach 1:
The patent applies parameter changes by adjusting the amplification factors of the regulator components based on the magnitude of detected deviations. When small deviations are detected, the system uses lower amplification factors to achieve precise neutral position control. When large deviations are detected, the system switches to higher amplification factors for faster correction, thus resolving the contradiction between correction speed and measurement precision.
Data Source
AI summary
In a method and apparatus for operating an internal combustion engine, a lambda control is carried out, in which a trim regulation is provided, which operates with a P regulator component and an I regulator component. To prevent overshooting when the trim regulation is carried out, operation takes place in a first mode with compulsory adjustment and in a following second mode with increased regulator amplification factors.