Engine Lubricant Additive Composition for Cleanliness and LSPI
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Solution Overview
Problem
Current lubricating formulations fail to meet the stringent standards for cleanliness, fuel economy, and low-speed preignition (LSPI) in modern engines, particularly in gasoline-fueled internal combustion engines.
Innovation Solution
A lubricating composition comprising a mixture of Group III and IV base oils, boron-containing and boron-free polyisobutenyl succinimide dispersants, overbased magnesium and calcium detergents, and molybdenum-containing materials, optimized to improve cleanliness, TBN retention, and reduce LSPI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lubricating formulations are used, then basic lubrication is maintained, but cleanliness, fuel economy, and low-speed preignition performance are insufficient
Solution Approach 1:
The patent employs a composite additive package combining multiple dispersants (boron-containing polyisobutenyl succinimide and boron-free polyisobutenyl succinimide), overbased magnesium detergent, overbased calcium detergent, and molybdenum-containing material. This composite formulation achieves superior cleanliness, fuel economy, and LSPI reduction by leveraging the synergistic effects of different additive components, each contributing specific functional properties to the overall lubricant system.
Solution Approach 2:
The patent specifies precise parameter ranges for each additive component: boron-containing dispersant (0.2-2.1 wt%), boron-free dispersant (0.5-6.5 wt%), magnesium detergent (delivering 400-1200 ppm Mg), calcium detergent (delivering 400-1200 ppm Ca), and molybdenum material (providing 40-1200 ppm Mo). By optimizing these concentration parameters, the formulation achieves the required performance improvements in cleanliness, fuel economy, and LSPI reduction while maintaining manufacturability.
2Reliability
If detergent and dispersant levels are increased to improve cleanliness, then TBN retention improves, but fuel economy and LSPI performance may deteriorate
Solution Approach 1:
The patent optimizes the balance between detergent/dispersant concentrations and performance outcomes. By specifying precise ranges for magnesium (400-1200 ppm) and calcium (400-1200 ppm) detergents along with dispersant levels, the formulation achieves adequate TBN retention while controlling viscosity and friction characteristics to maintain fuel economy. The molybdenum-containing material (40-1200 ppm) further refines this balance by providing anti-wear protection and friction reduction.
Solution Approach 2:
The patent employs different types of dispersants with distinct properties: boron-containing polyisobutenyl succinimide for specific dispersal functions and boron-free polyisobutenyl succinimide for complementary performance. This differentiation allows each component to address specific local needs within the lubricant system, optimizing TBN retention in critical areas while maintaining overall fuel economy.
3Reliability
If traditional additive packages are used, then formulation simplicity is maintained, but low-speed preignition reduction is insufficient
Solution Approach 1:
The patent incorporates a molybdenum-containing material (such as molybdenum dithiocarbamate, molybdenum dithiocarbamate dimer, or tri-nuclear molybdenum compound) as a key component for LSPI reduction. This specialized additive, combined with the dispersant and detergent package, creates a composite formulation that specifically addresses low-speed preignition mechanisms through friction modification and surface protection, achieving superior LSPI reduction despite the increased additive complexity.
Data Source
AI summary
The instant disclosure generally relates to lubricating compositions having an oil of lubricating viscosity, a mixture of boron-containing and boron-free dispersants, an overbased magnesium-based detergent, an overbased calcium-based detergent, a molybdenum-containing material, and, optionally, other performance additives. The instant lubricating compositions may improve one or more of cleanliness, TBN retention, fuel economy and low-speed preignition ("LSPI").