Comb-Shaped Polymer Lubricating Oil for Low-Temperature Fuel Economy
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Solution Overview
Problem
Existing lubricating oil compositions do not adequately address fuel consumption reduction in low-temperature regions, such as during engine startup, while maintaining favorable viscosity characteristics in high-temperature regions.
Innovation Solution
A lubricating oil composition incorporating a comb-shaped polymer viscosity index improver with a shear stability index (SSI) of 30 or less, regulated HTHS viscosity at 150°C between 1.6 to 2.9 mPa·s, and a kinematic viscosity to HTHS viscosity ratio of 12.4 or less, optimized for use in low-temperature regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional lubricating oil compositions are used to improve fuel consumption reducing properties in high-temperature regions, then fuel consumption is reduced at temperatures around 80-100°C, but fuel consumption reducing properties in low-temperature regions (25-60°C) are insufficient
Solution Approach 1:
The patent applies parameter changes by precisely controlling the SSI of the viscosity index improver to be 30 or less, and regulating the HTHS viscosity at 150°C to 1.6 to 2.9 mPa·s. These parameter adjustments enable the lubricating oil to achieve optimal viscosity characteristics across both low-temperature (25-60°C) and high-temperature (80-150°C) regions, resolving the contradiction between fuel consumption reduction and temperature range adaptability
2Stability of the object's composition
If viscosity index improvers with high SSI are used to maintain viscosity stability, then viscosity stability is improved, but fuel consumption reducing properties in low-temperature regions deteriorate
Solution Approach 1:
The patent fundamentally changes the SSI parameter from conventional high values to 30 or less. This parameter inversion enables the viscosity index improver to provide adequate viscosity stability while simultaneously reducing viscosity at low temperatures, thereby improving fuel consumption during engine startup without sacrificing viscosity control
3Use of energy by moving object
If HTHS viscosity at 150°C is reduced to improve low-temperature fuel consumption, then fuel consumption reducing properties are improved, but high-temperature lubrication performance may deteriorate
Solution Approach 1:
The patent establishes an optimal HTHS viscosity range of 1.6 to 2.9 mPa·s at 150°C through parameter control. This precise parameter regulation ensures that the viscosity is low enough to reduce fuel consumption while remaining high enough to maintain adequate lubrication film strength at high temperatures, thus resolving the contradiction between fuel efficiency and lubrication reliability
Solution Approach 2:
The patent employs a viscosity index improver with SSI ≤ 30 that dynamically adapts viscosity to temperature conditions. At low temperatures (25-60°C), the improver reduces viscosity to minimize friction and fuel consumption, while at high temperatures (150°C), it maintains viscosity within the optimal range to ensure lubrication performance, providing dynamic adaptability across operating conditions
Data Source
AI summary
The present invention provides a lubricating oil composition including a viscosity index improver (A) containing a comb-shaped polymer and having an SSI (shear stability index) of 30 or less together with a base oil, wherein an HTHS viscosity (high temperature high shear viscosity) at 150°C (T150) is 1.6 to 2.9 mPa·s, and a ratio of a kinematic viscosity at 40°C (V40) [mm2/s] to the HTHS viscosity at 150°C (T150) [mPa·s] (V40/T150) is 12.4 or less. The lubricating oil composition of the present invention is excellent in fuel consumption reducing properties in a low-temperature region assuming the time of starting an engine while making various properties, such as a viscosity, etc., in a high-temperature region assuming the time of high-speed operation of an engine favorable.