Lubricating Composition with Boron-Containing and Boron-Free Dispersants
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Solution Overview
Problem
Current lubricating formulations for internal combustion engines fail to adequately address issues such as cleanliness, fuel economy, TBN retention, and low-speed preignition (LSPI) in gasoline-fueled engines.
Innovation Solution
A lubricating composition comprising an oil of lubricating viscosity, a boron-containing polyisobutenyl succinimide dispersant, a boron-free polyisobutenyl succinimide dispersant, an overbased magnesium-based detergent, an overbased calcium-based detergent, and an ashless friction modifier, which improves engine performance by enhancing cleanliness, fuel economy, and reducing LSPI.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current lubricating formulations are used, then basic lubrication function is provided, but cleanliness, fuel economy, TBN retention, and low-speed preignition performance are insufficient
Solution Approach 1:
The patent applies composite materials by combining multiple dispersants (boron-containing PIB succinimide dispersant and boron-free PIB succinimide dispersant with specific molecular weights), overbased detergents (magnesium-based and calcium-based), and ashless friction modifiers in a synergistic formulation. This composite additive package achieves superior cleanliness, fuel economy, TBN retention, and LSPI reduction compared to single-additive formulations, while meeting API SN plus and ILSAC GF-6 specifications.
2Manufacturing precision
If stringent industry standards are met, then engine performance is improved, but formulation development and manufacturing become more difficult
Solution Approach 1:
The patent applies parameter changes by specifying precise molecular weight ranges for the PIB succinimide dispersants (750-1750 and 1950-2500), controlling boron content levels, and defining specific treatment processes (boration or boron-free modification). These controlled parameter changes enable consistent achievement of API SN plus and ILSAC GF-6 specifications while maintaining manufacturability through well-defined production parameters.
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, an ashless friction modifier, 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").