Internal Combustion Engine Fuel Adaptation for Variable Quality
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Solution Overview
Problem
Internal combustion engines face starting difficulties and uneven running due to variable fuel qualities and blends, especially when the fuel mixing ratio is unknown, leading to increased exhaust gas emissions and misfires.
Innovation Solution
Implementing a method that individually adjusts the fuel quantity for each cylinder to create a leaner or richer air/fuel mixture, allowing for evaluation of starting characteristics and smoothness, and transferring optimal operating parameters to all cylinders, enabling reliable starting and operation by comparing original and new fuel characteristics during the starting phase.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fuel quantity is individually adjusted for each cylinder to adapt to variable fuel characteristics, then the starting characteristics and running smoothness are improved, but the device complexity increases due to individual cylinder control
Solution Approach 1:
The control system divides the engine into individual cylinders, allowing independent fuel quantity adjustment for each cylinder. This segmentation enables the system to adapt to variable fuel characteristics by optimizing fuel delivery on a per-cylinder basis, thereby improving starting characteristics and running smoothness without requiring complete system redesign
Solution Approach 2:
The fuel quantity control is made dynamic and adaptable rather than fixed. The system continuously adjusts fuel delivery based on detected fuel characteristics and operating conditions, allowing the engine to optimize performance in real-time while maintaining manageable control complexity through algorithmic adaptation
2Speed
If the adaptation speed is significantly increased when refueling is detected, then the fuel adaptation is accelerated, but starting difficulties and misfires increase due to insufficient settling time
Solution Approach 1:
The system performs preliminary detection of refueling events and pre-adjusts the adaptation speed accordingly. By anticipating the need for fuel adaptation and preparing the control parameters in advance, the system achieves faster adaptation while maintaining sufficient settling time to prevent starting difficulties and misfires
Solution Approach 2:
The control system continuously monitors engine operating parameters and fuel consumption patterns to detect refueling events. This feedback mechanism allows the system to dynamically adjust adaptation speed based on actual conditions, accelerating fuel adaptation when safe while preventing starting issues through real-time monitoring and control
3Device complexity
If a uniform air/fuel mixture ratio is used for all cylinders, then the control system is simplified, but the starting characteristics deteriorate when fuel characteristics vary between cylinders
Solution Approach 1:
The system transitions from uniform control to localized control, allowing each cylinder to receive optimized fuel quantity based on its specific operating conditions and fuel characteristics. This local quality approach improves starting characteristics by tailoring fuel delivery to individual cylinder needs while maintaining manageable system complexity through targeted control strategies
Data Source
AI summary
The invention deals with a method for the operation of an internal combustion engine with at least two cylinders, which can be operated with a fuel of variable quality stored in a tank and/or with fuel blends stored in the tank from a first and at least a second fuel in variable mixing ratios, and wherein variable fuel qualities and/or fuel blends of different compositions require variable air/fuel ratios for the achievement of a stable combustion and/or have a variable vaporization behavior. Provision is, thereby, made for a variation, which is individually adjusted to each cylinder, of the quantity of fuel delivered to the cylinder to be implemented to supply a lean and/or to a rich air/fuel mixture at least one cylinder, for the effect of the variation on the starting characteristics and/or the running smoothness of the cylinder and/or the internal combustion engine to be evaluated and when an improvement in the starting characteristics and/or the running smoothness is achieved, for a fuel adaptation to be implemented for all cylinders. The method makes the quick detection and the avoidance of starting problems possible, when a change in the fuel quality or in the fuel composition occurs with an effect on the ignitability of the fuel.