Injector Dynamics for Alcohol Concentration Detection
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Solution Overview
Problem
Existing methods for determining the alcohol concentration in fuel mixtures for internal combustion engines, particularly in flex-fuel modes, are either costly or require additional sensors, leading to inaccuracies in adapting engine operational characteristics during fuel switching.
Innovation Solution
The method analyzes the opening and closing dynamics of the injector's characteristic curve, comparing it to stored reference curves for different fuel compositions to determine the alcohol concentration without the need for an ethanol sensor, utilizing existing engine components like high-pressure injectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If an ethanol sensor is used to determine alcohol concentration, then measurement accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The injector serves dual functions: fuel injection and alcohol concentration sensing. By analyzing the injector's own electrical characteristics (current, voltage, impedance) during normal operation, the system determines fuel composition without requiring separate sensing components. This self-service approach eliminates additional sensors while maintaining measurement capability.
Solution Approach 2:
The patent extracts the sensing function from separate dedicated sensors and integrates it into the existing injector system. By measuring electrical parameters of the injector itself during fuel injection, the system separates the concentration determination function from physical sensor hardware, achieving sensing capability without additional components.
2Measurement precision
If additional sensors are installed to determine fuel composition, then measurement capability is improved, but ease of operation and cost deteriorate
Solution Approach 1:
The injector is designed to perform multiple functions: primary fuel injection and secondary alcohol concentration detection. By evaluating the injector's electrical characteristics during normal operation, the system achieves dual functionality without requiring separate dedicated sensing components, thereby simplifying manufacturing and reducing costs.
Solution Approach 2:
The patent combines the fuel injection function and alcohol concentration sensing function into a single integrated system. The injector's electrical measurement capability is merged with its fuel delivery function, eliminating the need for separate sensor installations and simplifying system implementation.
3Productivity
If engine operational characteristics are adapted during fuel switching, then engine performance is improved, but errors in adaptation increase without accurate concentration data
Solution Approach 1:
The system continuously monitors the injector's electrical characteristics and uses this feedback to determine real-time alcohol concentration in the fuel mixture. This feedback mechanism enables accurate adaptation of engine operational characteristics during fuel switching by providing continuous concentration data without requiring separate sensing systems.
Solution Approach 2:
The system determines alcohol concentration by analyzing injector characteristics before and during fuel injection events. By performing concentration determination in advance of and during the injection process, the system ensures accurate adaptation data is available for optimal engine performance adjustment.
Data Source
AI summary
A method for determining a concentration of alcohol in a fuel mixture, where a characteristic curve for a parameter describing the dynamics of an injector, by which the fuel mixture is injected in an internal combustion engine, is ascertained; and where the concentration of alcohol is determined in light of a course of the characteristic curve. The invention also relates to a method for operating an internal combustion engine and a system for determining a concentration of alcohol in a fuel mixture.