Lubricating Oil Composition for Hybrid Engine Fuel Efficiency
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Solution Overview
Problem
Engine oils used in hybrid vehicles experience reduced fuel consumption reducing properties due to high viscosity at low temperatures and increased evaporativity and friction at high temperatures, leading to potential engine part breakage and inefficiencies.
Innovation Solution
A lubricating oil composition containing an olefin-based polymer, a comb-shaped polymer as a viscosity index improver, and an organic molybdenum-based compound, which maintains appropriate viscosity and reduces friction across a wide temperature range, ensuring effective lubrication and fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a low-viscosity base oil is used to reduce fuel consumption, then fuel consumption reducing properties are improved, but evaporativity increases and friction reducing effect is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the base oil by using a specific hydrocracked base oil with controlled aromatic content (5-20 wt%) and sulfur content (0.01-0.1 wt%), rather than simply reducing viscosity. This parameter optimization allows achieving low fuel consumption while maintaining appropriate evaporativity and friction characteristics through the synergistic effect with additives.
Solution Approach 2:
The patent creates a composite lubricating oil system by combining a hydrocracked base oil with specific viscosity index improvers (polymer I and polymer II in defined ratios) and friction modifiers. This composite formulation achieves the balance between low viscosity for fuel efficiency and sufficient film strength for friction protection that cannot be obtained with base oil alone.
2Use of energy by moving object
If a low-viscosity base oil is used, then fuel consumption reducing properties are improved, but oil film retention becomes difficult at high temperature
Solution Approach 1:
The patent optimizes the viscosity index improver composition by specifying polymer I content at 30-80 wt% and polymer II at 20-70 wt%, with controlled molecular weights and structures. This parameter control ensures the oil maintains appropriate viscosity at operating temperatures while keeping fuel consumption low, achieving thermal stability without sacrificing fuel efficiency.
Solution Approach 2:
The patent employs a composite viscosity modification system using two different polymer types (polymer I and polymer II) with complementary characteristics. Polymer I provides base viscosity improvement while polymer II enhances high-temperature stability, creating a synergistic effect that maintains oil film integrity at elevated temperatures while preserving fuel consumption benefits.
3Use of energy by moving object
If engine oil temperature is reduced to 50°C during motor operation, then fuel consumption is reduced, but viscosity increases and lubrication performance deteriorates
Solution Approach 1:
The patent modifies the base oil parameters by using hydrocracked oil with controlled aromatic content (5-20 wt%) and viscosity characteristics. This parameter optimization ensures the oil maintains appropriate viscosity even at reduced temperatures during hybrid operation, preventing excessive thickening that would impair lubrication while still achieving fuel consumption reduction.
Solution Approach 2:
The patent uses a composite base oil system combining hydrocracked base oil with specifically formulated viscosity index improvers. This composite formulation provides temperature-insensitive viscosity characteristics, ensuring adequate lubrication performance across the wide temperature range experienced during hybrid vehicle operation, from cold motor operation to hot engine conditions.
4Force
If friction modifier is added to low-viscosity base oil, then friction reduction is attempted, but friction reducing effect is not thoroughly revealed
Solution Approach 1:
The patent optimizes the friction modifier parameters by selecting organic molybdenum compounds with specific molecular structures and controlling their concentration (0.1-5 wt%). The base oil parameters (aromatic content 5-20 wt%, sulfur 0.01-0.1 wt%) are also optimized to enhance friction modifier effectiveness. This parameter coordination ensures the friction modifier can充分发挥 its friction-reducing potential in the hybrid operation context.
Solution Approach 2:
The patent creates a composite friction control system by combining the hydrocracked base oil with viscosity index improvers and organic molybdenum friction modifiers. The base oil composition is specifically designed to enhance the friction-reducing effectiveness of the molybdenum compound, creating a synergistic system where the base oil acts as an effective carrier and activator for the friction modifier, achieving thorough friction reduction despite low viscosity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The lubricating oil composition exhibits excellent fuel consumption reducing properties and friction reduction while minimizing evaporativity, effectively lubricating internal combustion engines in both high-temperature and low-temperature environments.
Implementation Method 1
an organic molybdenum-based compound... reduces friction under mixed lubricating conditions
Implementation Method 2
adding a friction modifier, such as an organic molybdenum compound, in the engine oil, to contemplate to reduce friction
Implementation Method 3
a viscosity index improver (B) containing a comb-shaped polymer (B1)... maintains appropriate viscosity across a wide temperature range
Implementation Method 4
when operating the engine at high speed, the evaporation of the engine oil becomes large due to an increase of thermal load
Data Source
AI summary
The present invention relates to a lubricating oil composition containing a base oil (A) containing an olefin-based polymer (A1) having an area ratio of a peak derived from a hydride (A11) of a decene trimer of 80% or more relative to 100% of a total area of peaks derived from the olefin-based polymer (A1) detected in a chromatogram and having predetermined kinematic viscosity, flash point, and pour point, a viscosity index improver (B) containing a comb-shaped polymer (B1), and an organic molybdenum-based compound (C), in which the content of the comb-shaped polymer (B1) is regulated within a specified range and having a HTHS viscosity at each of 150° C. and 50° C. of the lubricating oil composition and a NOACK value in predetermined ranges, respectively.