NOx Controller Injection Timing Adaptation
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Solution Overview
Problem
Existing NOx control methods for internal combustion engines often result in persistent control deviations due to limitations in adjusting the NOx concentration in exhaust gases, which can exceed legal emission limits.
Innovation Solution
A method that calculates an NOx control deviation and adjusts the cylinder inlet flow conditions by modifying the injection start based on an adaptation injection strategy, using a control value to determine when to activate adaption functions that either retard or advance the injection start, thereby optimizing NOx control without requiring complex mechanical adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the NOx controller adjusts the cylinder inlet flow volume to control NOx concentration, then the NOx emission can be reduced, but persistent control deviations remain that cause emission limits to be exceeded
Solution Approach 1:
The patent implements a feedback mechanism where the actual NOx value is continuously measured and compared with the desired NOx value to determine an NOx control deviation. This deviation is then fed back to the NOx controller to adjust the control value, creating a closed-loop control system that continuously corrects emissions to maintain compliance with legal limits.
Solution Approach 2:
The patent changes the injection begin parameter (injection timing) as an additional control variable to optimize NOx control. By adapting the injection begin based on the control value from the NOx controller, the system modifies combustion parameters to reduce NOx emissions while maintaining control quality and preventing persistent deviations.
2Reliability
If the injection begin is adjusted to optimize NOx control, then control quality improves, but the system requires complex adjustments beyond simple software changes
Solution Approach 1:
The patent replaces complex mechanical adjustments with software-based control. The adaption injection begin is determined through software evaluation of the control value against limit values, and the injection begin is adjusted via electronic control of the injection system. This substitution of mechanical adjustment mechanisms with electronic/software control reduces physical complexity while maintaining control quality.
Solution Approach 2:
The patent implements dynamic adjustment of the injection begin based on real-time control values. The system continuously evaluates the control value and adapts the injection timing accordingly, creating a dynamic control system that responds to changing operating conditions without requiring complex static mechanical adjustments.
Data Source
AI summary
In a method for controlling the NOx concentration in the exhaust gas of an internal combustion engine in which an NOx control deviation is calculated from an actual NOx value and a desired NOx value, a control value is calculated based on the NOx control deviation via an NOx controller and by means of the control value at least one condition of the cylinder inlet flow volume of the internal combustion engine is adjusted in that, additionally, an adaption injection begin is determined in dependence on the control value of the NOx controller, and the injection begin is changed by the adaption injection begin.