Fuel Injector Operating Mode Detection Using Structure-Borne Sound
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Solution Overview
Problem
Existing internal combustion engines face challenges in accurately determining the operating mode of fuel injectors, particularly when switching between large and small fuel quantity injections, which is crucial for adhering to emission standards and efficient engine operation.
Innovation Solution
The method involves detecting and evaluating structure-borne sound waves emitted by fuel injectors upon activation to deduce their operating mode by analyzing local maximums in the sound wave signals, allowing for the differentiation between small, medium, and large fuel quantity injections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate ignition fluid injector is installed to introduce small quantities of diesel fuel into the cylinder in the second operating mode, then the fuel injection accuracy for small quantities is improved, but the device complexity and installation space requirements increase
Solution Approach 1:
The main fuel injector is designed to perform multiple functions: it serves as the primary fuel injector for introducing large quantities of diesel fuel during the first operating mode (diesel operating mode), and simultaneously functions as an ignition fluid injector for introducing small quantities of diesel fuel during the second operating mode (gas operating mode). This multi-functionality eliminates the need for a separate ignition fluid injector, reducing device complexity while maintaining fuel injection accuracy through electronic control of the solenoid valve activation duration
Solution Approach 2:
The system changes the operating parameters of the main fuel injector based on the operating mode. In the first operating mode, the solenoid valve is activated for a longer duration to introduce large quantities of diesel fuel. In the second operating mode, the solenoid valve activation duration is reduced to introduce only small quantities of diesel fuel as ignition fluid. This parameter change allows a single injector to serve multiple purposes with different fuel quantities
2Device complexity
If the main fuel injector is used to introduce both large quantities of diesel fuel in the first operating mode and small quantities of ignition fluid in the second operating mode, then the device complexity is reduced, but the difficulty of detecting and measuring the operating state increases
Solution Approach 1:
The system utilizes structure-borne sound waves (mechanical vibrations) generated by the fuel injector during operation as a measurement signal. A measurement device detects these vibrations, and the evaluation device analyzes the signal characteristics to determine the operating state of the fuel injector, enabling distinction between the first operating mode (large fuel quantity) and the second operating mode (small fuel quantity)
Solution Approach 2:
The system implements a feedback mechanism where the measurement device continuously monitors the structure-borne sound waves emitted by the fuel injector, and the evaluation device processes this information to determine the current operating mode. This feedback loop enables real-time detection and monitoring of the fuel injector's operating state, ensuring accurate identification of whether the injector is operating in the first or second mode
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables reliable and accurate determination of fuel injection quantities, ensuring compliance with emission regulations and optimizing engine performance across different operating modes.
Implementation Method 1
structure-borne sound waves emitted by a respective fuel injector are determined by measurement commencing with the activation of the respective fuel injector for opening
Data Source
AI summary
A method for operating an internal combustion engine having at least one fuel injector that is activated for opening and closing via a solenoid valve of a respective fuel injector. Commencing with the activation of the fuel injector for opening, structure-borne sound waves emitted by the fuel injector over the time are detected by measurement. A structure-borne sound wave signal detected by measurement over the time is evaluated such that dependent on the amount of at least one maximum of the structure-borne sound wave signal and/or dependent on the number of the maximums of the structure-borne sound wave signal and/or in the presence of multiple maximums dependent on the time sequence and/or on the amount of the maximums, an operating state of the respective fuel injector is deduced.