Lubricating Oil Composition for Engine Knock And Pre-Ignition
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Solution Overview
Problem
Existing lubricating oil compositions fail to effectively reduce abnormal combustion events such as knock and pre-ignition in internal combustion engines, particularly in direct injection engines and hydrogen engines, especially when using fuels that promote these events like ethanol and e-fuels, and they often require complex formulations to maintain engine performance.
Innovation Solution
Formulating lubricating oil compositions with high levels of abnormal combustion event inhibitors, such as phosphorus, boron, and silicon, and low levels of promoters like calcium, to significantly reduce or eliminate these events, allowing for higher compression ratios and wider fuel compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lubricating oil compositions use traditional formulations with calcium and other additives, then engine protection and lubrication are maintained, but abnormal combustion events such as knock and pre-ignition increase
Solution Approach 1:
The patent changes the chemical composition parameters of the lubricating oil by reducing calcium content to below 1000 ppm and sodium content to below 1000 ppm, while increasing phosphorus content to above 800 ppm and boron content to above 100 ppm. This parameter adjustment resolves the contradiction by modifying the additive package to suppress abnormal combustion while maintaining necessary engine protection through alternative protective mechanisms.
Solution Approach 2:
The patent employs a composite additive strategy combining multiple elements (phosphorus, boron, zinc, calcium, sodium) in specific proportions rather than relying on traditional single-additive approaches. This composite formulation creates synergistic effects where the combination of additives provides both abnormal combustion suppression and engine protection, resolving the contradiction between reducing harmful combustion events and maintaining reliability.
2Object-affected harmful factors
If lubricating oil formulations are simplified to reduce abnormal combustion events, then knock and pre-ignition are reduced, but engine performance maintenance becomes difficult
Solution Approach 1:
The patent optimizes the concentration parameters of various additives to achieve the desired balance. Specifically, it sets phosphorus above 800 ppm, boron above 100 ppm, zinc above 500 ppm, calcium below 1000 ppm, and sodium below 1000 ppm. These parameter changes enable the lubricant to suppress abnormal combustion while maintaining adequate engine performance through the coordinated action of the additive package.
Solution Approach 2:
The patent creates a new additive formulation model that copies and adapts successful elements from different lubricant technologies. By incorporating phosphorus and boron compounds in specific ratios alongside traditional zinc dialkyl dithiophosphate and calcium sulfonate, the formulation replicates the beneficial effects of complex multi-component systems while achieving simpler overall composition that maintains performance.
3Object-affected harmful factors
If lubricating oil uses high levels of phosphorus and boron to reduce abnormal combustion, then knock and pre-ignition are suppressed, but the formulation complexity increases
Solution Approach 1:
The patent establishes specific concentration ranges for each additive component that simplify the formulation process. By defining phosphorus >800 ppm, boron >100 ppm, zinc >500 ppm, calcium <1000 ppm, and sodium <1000 ppm, the patent creates a clear formulation target that reduces complexity compared to trial-and-error approaches. The defined ranges enable manufacturers to achieve abnormal combustion suppression without excessive formulation complexity.
4Reliability
If traditional lubricant additives are used, then engine lubrication is adequate, but abnormal combustion events increase with ethanol and e-fuel usage
Solution Approach 1:
The patent develops a composite additive system specifically tailored for alternative fuel compatibility. The combination of phosphorus compounds, boron compounds, zinc dialkyl dithiophosphate, calcium sulfonate, and sodium sulfonate creates a synergistic formulation that addresses the unique challenges of ethanol and e-fuel combustion. This composite approach maintains lubrication adequacy while suppressing abnormal combustion events that occur with alternative fuels.
Solution Approach 2:
The patent adjusts the concentration parameters of additives to account for alternative fuel characteristics. The specific ranges (phosphorus >800 ppm, boron >100 ppm, etc.) are optimized for use with ethanol and e-fuels, differing from traditional formulations. These parameter changes enable the lubricant to maintain protective functions while adapting to the different combustion chemistry of alternative fuels, reducing abnormal combustion events.
Data Source
AI summary
This invention relates to methods to reduce abnormal combustion events in the operation of an internal combustion engine comprising using a lubricating oil composition comprising/resulting from the admixing of: (i) base oil, (ii) detergent, preferably providing at least 800 ppm Mg and less than 500 ppm Ca; and (iii) abnormal combustion event inhibitor compound(s), preferably comprising at least one phosphorus containing compound providing greater than 0.12 mass % phosphorus; wherein: 1) the lubricating oil composition is a SAE 10W-X, SAE 5W-X or SAE 0W-X blend, where X is 8, 12, 16, 20, or 30; and 2) when the lubricating oil composition is combined with an 88 octane reference fuel, the combination completes at least 1 iteration of 175,000 cycles per iteration, as determined by Sequence IX Test, ASTM D829.