Molybdenum Lubricant Reduces Pre-ignition in Hydrogen Engines
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Solution Overview
Problem
Hydrogen fueled internal combustion engines face challenges with pre-ignition, a form of abnormal combustion event, due to the unique combustion properties of hydrogen, which increases the potential for early abnormal ignition.
Innovation Solution
The use of a lubricating oil composition containing a molybdenum containing compound, along with a base oil and an overbased metal containing detergent, to reduce abnormal combustion events such as pre-ignition in hydrogen fueled internal combustion engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If hydrogen is used as fuel in internal combustion engines, then fuel efficiency and emissions are improved, but pre-ignition and abnormal combustion events increase
Solution Approach 1:
Molybdenum compounds are introduced as intermediary substances in the lubricating oil composition. These compounds act as mediators that interfere with the combustion process by depositing on combustion chamber surfaces and reducing the reactivity of hot spots, thereby preventing pre-ignition of hydrogen while maintaining combustion efficiency
Solution Approach 2:
The invention changes the chemical composition parameters of the lubricating oil by incorporating specific molybdenum compounds (such as molybdenum dithiocarbamate, molybdenum dithiophosphate) at controlled concentrations (20-2000 ppm). This parameter change modifies the surface chemistry of combustion chamber components, reducing their ability to initiate abnormal combustion
2Object-affected harmful factors
If molybdenum containing compound is added to lubricating oil composition, then pre-ignition is reduced, but oil composition complexity increases
Solution Approach 1:
The molybdenum compounds serve multiple functions simultaneously: they act as anti-wear agents, friction modifiers, and pre-ignition inhibitors. This multi-functionality reduces the need for separate additives, thereby limiting the increase in composition complexity while achieving the desired reduction in abnormal combustion events
Solution Approach 2:
The invention creates a composite lubricating oil composition by combining molybdenum compounds with base oils and other conventional additives. This composite approach integrates the pre-ignition inhibition function into the existing lubricant structure, managing complexity through systematic formulation rather than isolated additive addition
3Reliability
If molybdenum containing compound is used in lubricating oil, then engine durability is improved, but manufacturing cost increases
Solution Approach 1:
The molybdenum compounds are used in relatively small quantities (20-2000 ppm) as sacrificial additives that deposit on combustion chamber surfaces. These compounds are consumed over time as they form protective layers, but their low concentration requirements and extended service life of the treated engine components make the overall cost-effective
Data Source
AI summary
This invention relates to a method of reducing abnormal combustion events in a hydrogen fueled internal combustion engine (HICE) during operation of the engine. The method includes the steps of: a) providing to the HICE a lubricating oil composition including or resulting from the admixing of: i) a base oil having a KV100 of less than or equal to 12 cSt and included at greater than 50 wt. % of the composition and comprising a Group I base oil, a Group II base oil, a Group III base oil, a Group IV base oil, or combinations thereof; ii) at least one overbased metal containing detergent with a Total Base Number (KOH/g) greater than or equal to 9 and less than or equal to 500 and included at a treat level to deliver between 100 to 5000 ppm by weight of total metal and between 0.15 wt. % to 8.0 wt. % of total soap to the composition; iii) at least one molybdenum containing compound included at a treat level to deliver between 20 to 2000 ppm by weight of total molybdenum to the composition; and iv) the lubricating oil composition having a total sulfated ash of less than or equal to 2.0 wt. %, a total phosphorous level of less than or equal to 0.120 wt. %, and a SAE viscosity grade of 25W-X, 20W-X, 15W-X, 10W-X, 5W-X or 0W-X, where X represents any one of 8, 12, 16, 20, 30, 40, 50 or 60; b) providing a fuel comprising hydrogen to the HICE; and c) combusting the fuel in the HICE. Also provided are a lubricating oil composition and a concentrate for use in a HICE to reduce the propensity for abnormal combustion events.