Gasoline Engine Oil Formulation for Particulate Emission Control
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Solution Overview
Problem
Gasoline engines face challenges in reducing particulate emissions, particularly due to injector coking and variations in fuel composition and engine characteristics, which can lead to increased particulate emissions despite the use of gasoline particulate filters.
Innovation Solution
A lubricating composition with a specific calcium and magnesium mineral profile, including at least 1500 ppm of calcium and no more than 500 ppm of magnesium, is used to lubricate gasoline engines, which reduces particulate emissions by optimizing the weight ratio of calcium to magnesium in detergent additives and incorporating additional minerals like molybdenum, phosphorus, and zinc.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional lubricating compositions with mixed calcium and magnesium are used, then engine lubrication is maintained, but particulate emissions increase
Solution Approach 1:
The patent changes the chemical composition parameters of the lubricating oil by specifying a calcium-to-magnesium weight ratio of 10:1 to 300:1, with calcium at 1500-5000 ppm and magnesium at 10-500 ppm. This parameter optimization reduces particulate emissions by controlling the ash-forming characteristics of the lubricant additives.
Solution Approach 2:
The invention uses a composite detergent additive system combining calcium-based detergents (providing 1500-5000 ppm calcium) with magnesium-based detergents (providing 10-500 ppm magnesium) in specific ratios. This composite approach maintains effective engine protection while optimizing emission characteristics through synergistic interactions between the different metal additives.
2Object-affected harmful factors
If gasoline particulate filters are used, then particulate emissions are reduced, but performance is affected by filter age and accumulation
Solution Approach 1:
The patent applies preliminary action by optimizing the lubricant composition before the engine operates, specifically by controlling the calcium and magnesium content to prevent excessive ash accumulation in the GPF. This proactive approach reduces the rate of filter loading and extends filter life before regeneration is needed.
Solution Approach 2:
The invention changes the chemical parameters of the lubricant to reduce harmful ash formation. By specifying calcium at 1500-5000 ppm and magnesium at 10-500 ppm with a weight ratio of 10:1 to 300:1, the patent optimizes the combustion byproducts that reach the GPF, thereby improving filter performance stability over time.
3Shape
If injector coking is not controlled, then fuel spray optimization is compromised, but particulate emissions increase
Solution Approach 1:
The patent extracts and controls the ash-forming components in the lubricant that contribute to injector coking. By limiting magnesium content to 10-500 ppm and controlling the calcium-to-magnesium ratio, the invention reduces the formation of deposits on injectors, thereby maintaining optimal fuel spray characteristics and reducing particulate emissions.
Data Source
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AI summary
Methods of reducing particulate emissions from a gasoline engine by lubricating the gasoline engine with select calcium and magnesium-based lubricating oil compositions.