Ashless Diesel Engine Oil Composition for DPF and Wear
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Solution Overview
Problem
Diesel engine oils with low ash content struggle to maintain engine detergency and prevent DPF clogging without metallic detergents, leading to reduced anti-wear performance and oxidative stability.
Innovation Solution
A lubricating oil composition for diesel engines with a balanced blend of zinc dithiophosphates, succinimides, and amine-based anti-oxidants, excluding metallic detergents, to achieve low ash levels while maintaining piston detergency and reducing valve train wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If metallic detergents are reduced or eliminated to lower ash content, then DPF clogging is prevented, but engine detergency performance deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by eliminating metallic detergents (salicylates, phenates, sulphonates) and replacing them with non-metallic alternatives (succinimides with boron, amine-based anti-oxidants). This parameter change maintains detergency function while reducing ash content to 0.3% or less, resolving the contradiction between low ash requirement and engine detergency performance.
Solution Approach 2:
The patent uses non-metallic organic compounds (succinimides and amine-based anti-oxidants) as replacements for traditional metallic detergents. These organic additives provide the necessary detergency function without forming permanent ash deposits, effectively serving as disposable protective agents that decompose harmlessly rather than accumulating as harmful residue in the DPF.
2Duration of action of stationary object
If metallic additives are reduced to lower ash content, then DPF life is extended, but anti-wear performance deteriorates
Solution Approach 1:
The patent modifies the additive package by reducing zinc dialkylthiophosphate (ZnDTP) content to 0.05-0.12% zinc and replacing metallic wear protection agents with non-metallic alternatives. The succinimide-based additives with boron modification provide boundary lubrication and wear protection without contributing to ash formation, thus extending DPF life while maintaining adequate anti-wear performance.
Solution Approach 2:
The patent introduces succinimide compounds with boron modification as intermediary substances that mediate between the conflicting requirements of low ash content and adequate wear protection. These compounds act as ashless dispersants and boundary lubricants, providing protective functions traditionally fulfilled by metallic additives without the harmful ash byproduct.
3Object-generated harmful factors
If metallic detergents are eliminated to achieve low ash, then environmental impact is reduced, but oxidative stability deteriorates
Solution Approach 1:
The patent employs amine-based anti-oxidants as non-metallic protective agents that sacrificially oxidize to protect the base oil and other additives. These organic anti-oxidants decompose into harmless substances rather than forming persistent ash deposits, providing oxidative stability while minimizing environmental impact through elimination of metallic contaminants.
Solution Approach 2:
The patent creates a composite additive system combining succinimide dispersants with boron modification and amine-based anti-oxidants. This composite formulation provides synergistic effects where the boron-modified succinimides enhance dispersancy and the amine anti-oxidants provide oxidative stability, collectively replacing the multiple functions previously provided by metallic detergents and anti-oxidants.
Data Source
AI summary
Lubricating oil composition for use in diesel engines which comprises, in the base oil, not more than 0.3% by mass of sulphated ash, from 0.01 to 0.2% by mass of nitrogen in succinimides, from 0.05 to 0.12% by mass of zinc in zinc dithiophosphates, from 0.02 to 0.3% by mass of nitrogen in amine-based anti-oxidants, and from 0.01 to 0.08% by mass of boron, which further has a total value of [(zinc amount in zinc dithiophosphates) x (nitrogen amount in succinimides)] and [(zinc amount in zinc dithiophosphates) x (nitrogen amount in amine-based anti-oxidants) ] as regards the aforementioned of from 0.015 to 0.06, and which does not contain salicylate, phenate or sulphonate metallic detergents. The intention is to obtain a lubricating oil composition for use in diesel engines which does not contain a metallic detergent yet maintains excellent engine (piston) detergency while preventing DPF clogging, and which reduces valve-train wear.