Lubricating Oil Composition for Diesel Engine Fuel Efficiency

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Solution Overview

Problem

Conventional lubricating oils face challenges in achieving a balance between low temperature viscosity properties, high-temperature detergency, and fuel efficiency, especially in diesel engines with soot contamination, where reduced ZnDTP and metallic detergent content leads to decreased anti-wear and detergency performance.

Innovation Solution

A lubricating oil composition with a lubricating base oil having a urea adduct value of no greater than 4% and a viscosity index of 100 or higher, incorporating an ashless friction modifier and a phosphorus-containing anti-wear agent, which improves low temperature viscosity and anti-wear properties while maintaining low ash content and supporting long-term exhaust gas after-treatment device performance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of energy

If ZnDTP and metallic detergent content are reduced to improve fuel efficiency and support exhaust gas after-treatment devices, then ash content and phosphorus content decrease, but anti-wear and detergency performance deteriorate

Engineering Contradiction:

Improvefuel efficiencyVSAvoidanti-wear and detergency performance

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent changes the chemical composition parameters by introducing specific compounds (organometallic friction modifiers with groups IVB-VIIB metals and sulfur/nitrogen/oxygen compounds) to replace traditional ZnDTP and metallic detergents, maintaining protective functions while reducing ash and phosphorus content

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses composite additive packages combining organometallic friction modifiers with sulfur-containing compounds, nitrogen-containing compounds, or oxygen-containing compounds to achieve synergistic effects that maintain anti-wear and detergency performance while reducing harmful ash content

Inventive Principle:

Principle #40Composite materials

2Loss of energy

If conventional organic molybdenum compounds are added to reduce frictional loss, then fuel efficiency improves, but soot contamination and metal abrasion dust damage the friction reducing effect

Engineering Contradiction:

Improvefrictional lossVSAvoidfriction reducing effect durability

Core Design Contradiction:

Loss of energyVSReliability

Solution Approach 1:

The patent changes the friction modifier chemistry from conventional organic molybdenum compounds to organometallic compounds with diverse metal groups (IVB-VIIB) combined with sulfur/nitrogen/oxygen compounds, creating formulations resistant to soot and metal dust deactivation

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent employs sacrificial protective films formed by the additive package that continuously replenish the friction surface protection, sacrificing additive molecules to maintain the protective coating despite soot contamination

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS7867957B2Lubricating oil composition

Publication Date: 2011.01.11 JX NIPPON OIL & ENERGY CORP

AI summary

The lubricating oil composition of the invention comprises a lubricating base oil with a urea adduct value of no greater than 4% by mass and a viscosity index of 100 or higher, an ashless friction modifier at 0.01-10% by mass and a phosphorus-containing anti-wear agent at 0.01-0.2% by mass as phosphorus, based on the total amount of the composition.