Ester-Based Lubricating Oil for Engine Knock Prevention

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Solution Overview

Problem

High compression spark ignition engines face issues with engine knocking and pre-ignition due to the propensity of hydrocarbon-based lubricating oils to ignite easily under compression, leading to damage and efficiency reduction, with existing solutions either reducing engine performance or posing environmental concerns.

Innovation Solution

A lubricating oil formulation using a base stock comprising esters with specific groups (Formula 1, 2, and 3) and ashless antiwear additives like phosphorus-containing, sulfur-containing, or phosphorus/sulfur-containing compounds to minimize the likelihood of engine knocking and pre-ignition.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If hydrocarbon-based lubricating oils are used in high compression spark ignition engines, then lubrication performance is maintained, but engine knocking and pre-ignition occur due to easy ignition under compression

Engineering Contradiction:

Improveengine durabilityVSAvoidengine knocking and pre-ignition

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the chemical composition parameters of the lubricating oil by using esters with specific molecular structures (Formulas 1, 2, and 3) instead of traditional hydrocarbons. These ester structures have higher ignition resistance, preventing engine knocking and pre-ignition while maintaining lubrication performance in high compression engines

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite lubricating oil formulation combining multiple ester types with specific chemical groups. This composite ester-based oil integrates the beneficial properties of different ester structures to achieve both excellent lubrication and high ignition resistance simultaneously

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If spark timing is retarded or boost pressure is reduced to control knocking, then engine knocking is controlled, but engine efficiency and power output are reduced

Engineering Contradiction:

Improveengine knockingVSAvoidengine power output

Core Design Contradiction:

Object-affected harmful factorsVSPower

Solution Approach 1:

The ester-based lubricating oil self-regulates ignition timing by resisting premature ignition under compression. The oil's chemical structure inherently prevents knocking without requiring external control measures like retarded spark timing, thus maintaining optimal engine power output

Inventive Principle:

Principle #25Self-service

3Object-affected harmful factors

If traditional oxygenate additives like methanol, ethanol, or MTBE are used to increase octane number, then resistance to abnormal combustion is improved, but corrosion, elastomer compatibility, or environmental issues occur

Engineering Contradiction:

Improveabnormal combustion resistanceVSAvoidcorrosion, elastomer incompatibility, environmental pollution

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent replaces problematic oxygenate additives with ester-based lubricating oil components that provide similar octane enhancement benefits without the harmful side effects. The ester structures offer sustained protection against abnormal combustion without corroding engine components or polluting the environment

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Data Source

PatentUS10119090B2Composition and method for preventing or reducing engine knock and pre-ignition in high compression spark ignition engines

Publication Date: 2018.11.06 EXXONMOBIL TECHNOLOGY & ENGINEERING CO

AI summary

A method for preventing or reducing engine knock or pre-ignition in a high compression spark ignition engine lubricated with a lubricating oil by using as the lubricating oil a formulated oil. The formulated oil has a composition that contains (i) a lubricating oil base stock comprising at least one ester including at least one group selected from the group consisting of Formula (1), Formula (2), and Formula (3):The lubricating oils of this disclosure are useful as passenger vehicle engine oil (PVEO) products.