Ashless Lubricant for Pilot Ignition Engine Emissions
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Solution Overview
Problem
Internal combustion engines face challenges with lubricant technology, including reduced oil change intervals, damage to exhaust after-treatment devices due to decomposed extreme pressure agents, and high NOx emissions, as well as issues with pilot ignition systems causing engine deposits and EGR system damage.
Innovation Solution
A low sulfur, low phosphorus, low ash lubricant composition is used, which includes a succinimide dispersant with high TBN, injected into the engine's combustion chambers during the pilot ignition phase, extending oil change intervals and reducing NOx emissions while protecting after-treatment devices and improving engine efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricating oils with extreme pressure agents are used, then sufficient lubrication to high wear areas is provided, but damage to exhaust after-treatment devices occurs due to decomposition products
Solution Approach 1:
The patent removes extreme pressure agents containing metal and phosphorus from the lubricant formulation. The lubricant composition is specifically designed without these harmful additives, extracting the problematic components while maintaining lubrication through alternative means such as improved base oil selection and different additive packages that do not produce harmful decomposition products in the exhaust system.
Solution Approach 2:
The patent changes the chemical composition parameters of the lubricant by reducing sulfur, phosphorus, and metal content to meet ultra-low sulfur diesel (ULSD) requirements. This parameter change allows the lubricant to be compatible with after-treatment devices while still providing adequate lubrication through modified additive chemistry and base oil formulations.
2Loss of time
If oil change intervals are extended to coincide with other service intervals, then maintenance complexity is reduced, but lubricant performance degradation occurs before the extended interval
Solution Approach 1:
The patent modifies the lubricant's chemical stability parameters through selective additive packaging and base oil selection. The lubricant is formulated with improved oxidation stability and contamination resistance, allowing it to maintain performance characteristics throughout extended service intervals while accommodating the requirements of modern low-sulfur fuels and after-treatment systems.
3Productivity
If pilot ignition systems are used to increase dilution tolerance, then fuel economy is improved, but damage and deposit build-up occur in combustion chamber and after-treatment devices
Solution Approach 1:
The patent changes the lubricant's chemical composition to be compatible with pilot ignition operation. By formulating without extreme pressure agents and using improved base oils with better thermal stability, the lubricant reduces deposit formation in the combustion chamber and exhaust system while allowing the engine to operate with higher dilution ratios for improved fuel economy.
Data Source
AI summary
The present invention relates to methods of using a low sulfur, low phosphorus, low-ash, zinc free consumable lubricating composition in an internal combustion engine equipped with a pilot ignition system, where the composition comprises: an oil of lubricating viscosity; a high TBN succinimide dispersant and where the lubricant composition overall has a sulfated ash value of up to about 0.2, a phosphorus content of up to about 50 to about 800 ppm and a sulfur content of up to about 0.4 percent by weight.