Optical Sensor Window Cleaning for Engine Fluid Detection
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Solution Overview
Problem
Monitoring combustion processes in internal combustion engines is challenging due to high temperatures and the presence of soot and unburned hydrocarbons, which hinder the operation of standard sensing technologies.
Innovation Solution
An optical sensing technique using an electromagnetic source to emit radiation through a metal tube, with an interference filter to select specific wavelengths, and a detector to measure the radiation's strength after passing through the engine fluid, along with a controller to determine constituent concentrations and a window cleaning mechanism to remove debris.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If standard sensor types are used to monitor combustion processes, then the sensing technology can be implemented, but the high temperatures and presence of soot and unburned hydrocarbons hamper operation and reduce reliability
Solution Approach 1:
The patent introduces an optical window as an intermediary element that allows electromagnetic radiation to pass through while isolating the sensor from direct exposure to harsh combustion conditions. The window material is specifically selected to be transparent at diagnostic wavelengths while withstanding the thermal and chemical environment, thereby enabling reliable sensing without direct sensor exposure to harmful factors.
Solution Approach 2:
The patent replaces traditional mechanical or electrical sensors with an optical sensing system that uses electromagnetic radiation to detect combustion constituents. This substitution allows the system to operate in high-temperature environments where conventional sensors would fail, as optical detection can be performed through transparent materials without direct contact with the harsh environment.
2Measurement precision
If optical sensing is used to detect engine fluid constituents, then detection capability is improved, but debris accumulates on the optical sensing window and compromises sensor functionality
Solution Approach 1:
The patent implements a cleaning mechanism that proactively removes debris from the optical window before it accumulates to problematic levels. The system includes a wiper or cleaning element that periodically contacts the optical window to remove soot and deposits, thereby maintaining transmission characteristics and ensuring continuous reliable operation.
Solution Approach 2:
The cleaning mechanism is integrated into the existing sensor assembly and operates automatically as part of the monitoring system. The wiper or cleaning element is positioned to self-clean the optical window during normal operation or at scheduled intervals, eliminating the need for external maintenance intervention and ensuring sustained sensor reliability.
3Measurement precision
If electromagnetic radiation is emitted through metal tubes with interference filters, then specific wavelength selection is achieved, but the system complexity increases
Solution Approach 1:
The patent applies interference filters at specific locations within the optical path where wavelength selection is most effective. Rather than making the entire system complex, the filters are strategically positioned to provide the necessary spectral selectivity only where needed, maintaining simplicity in other portions of the system while achieving precise wavelength selection for target constituent detection.
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
Enables reliable detection of engine fluid constituents, including nitrogen oxides, hydrocarbons, and sulfur compounds, while maintaining sensor functionality despite adverse conditions, thereby improving engine monitoring and maintenance.
Implementation Method 1
emitting electromagnetic (EM) radiation through a sample channel containing a working engine fluid... detecting a response of the working engine fluid to the radiation
Implementation Method 2
with an interference filter to select specific wavelengths
Implementation Method 3
a detector to measure the radiation's strength after passing through the engine fluid
Data Source
AI summary
A system for detecting engine fluid constituents includes an engine having a sample channel having a conduit for a working engine fluid. The system includes an electromagnetic (EM) source that emits EM radiation through a first metal tube, where the EM radiation is EM energy at a wavelength of interest. The system further includes an EM detector that receives a remainder radiation through a second metal tube, the remainder radiation including the remaining EM radiation after passing through the sample channel. The system includes a controller that determines a composition indicator signal representative of an amount of a constituent in the working engine fluid in response to a strength of the remainder radiation, and determines a concentration of a component of interest according to the composition indicator signal.