Laser Induced Breakdown Spectroscopy for Engine Oil Consumption Measurement
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Solution Overview
Problem
Current methods for real-time measurement of engine oil consumption in internal combustion engines face challenges such as interference from exhaust components, high operational costs, complexity, and regulatory issues with sulfur detection and radioactive tracers, necessitating a more precise and cost-effective solution.
Innovation Solution
Laser-induced breakdown spectroscopy (LIBS) is used to irradiate engine exhaust and detect emission signals characteristic of elemental ions like calcium, allowing for real-time measurement of oil consumption by correlating signal intensity with oil consumption rates, employing a high-energy laser and spectral detection system integrated with the exhaust line.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ultraviolet excitation and fluorescence detection is used to detect sulfur in exhaust, then real-time oil consumption measurement is achieved, but interference from other exhaust components increases and system complexity increases
Solution Approach 1:
The patent replaces the complex mechanical sampling system (furnace, water vapor removal, ozone generator) with a direct optical detection method. The LIBS technique uses laser-induced plasma generation and spectral analysis to detect oil consumption markers directly in the exhaust stream, eliminating the need for complex mechanical pretreatment equipment while maintaining real-time measurement capability.
Solution Approach 2:
The patent introduces laser-induced plasma as an intermediary state to enable detection. By converting the exhaust gases into a plasma state through laser irradiation, the technique creates a controlled environment where spectral analysis can identify oil consumption markers without interference from other exhaust components, thus simplifying the overall measurement system.
2Measurement precision
If sulfur detection methods are used, then real-time measurement is achieved, but regulatory and safety challenges increase
Solution Approach 1:
The patent changes the detection parameter from sulfur concentration to optical spectral signatures of oil consumption markers. By measuring the intensity and wavelength of light emitted during laser-induced breakdown of exhaust molecules, the technique can quantify oil consumption without relying on sulfur content, thereby avoiding regulatory and safety issues associated with sulfur handling and measurement.
3Measurement precision
If radioactive tracer element is used, then interference is reduced, but regulatory and safety challenges increase
Solution Approach 1:
The patent replaces radioactive tracer detection with optical detection using LIBS. Instead of measuring radioactive emissions, the technique uses laser-induced plasma spectroscopy to detect oil consumption markers, eliminating all radioactive material handling while maintaining the ability to measure oil consumption with high precision and without interference.
4Object-generated harmful factors
If complex aftertreatment systems are used to reduce emissions, then emissions decrease, but oil consumption impact becomes more significant
Solution Approach 1:
The patent implements real-time feedback measurement of oil consumption using LIBS. By continuously monitoring the exhaust stream for oil consumption markers and providing immediate data on oil consumption rates, the system enables operators to adjust engine operation or maintenance schedules to prevent excessive oil consumption, thereby protecting aftertreatment systems from contamination while maintaining low emissions.
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
LIBS provides a precise, cost-effective, and interference-resistant method for measuring engine oil consumption, enabling early detection of oil-related issues and reducing contamination of exhaust after-treatment systems, with the ability to measure rates from 0.1 g/hr to 30 g/hr without sample collection or treatment.
Implementation Method 1
irradiating engine exhaust and detecting the emission signal intensity versus wavelength in said engine exhaust by laser-induced breakdown spectroscopy (LIBS)
Implementation Method 2
a laser light source configured to emit an optical beam with a power density of greater than or equal to 1 GW/cm2 towards the optical access of the test area of the exhaust that generates an ionized plasma within the exhaust
Implementation Method 3
detecting the emission signal intensity versus wavelength in said engine exhaust by laser-induced breakdown spectroscopy (LIBS) and identifying in the emission signal intensity versus wavelength one or more emission signals having an intensity that is characteristic of an elemental ion in the engine exhaust
Data Source
AI summary
A method, apparatus and/or system for measuring engine oil consumption using laser induced breakdown spectroscopy.