Overbased Detergent Lubricants for Hydrogen Engine Pre-ignition
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Solution Overview
Problem
Hydrogen fueled internal combustion engines experience pre-ignition issues due to the unique combustion properties of hydrogen, which are not effectively addressed by existing lubricant additive chemistries.
Innovation Solution
The use of overbased metal-containing detergents, such as overbased metal salicylate and phenate detergents, in lubricating oil compositions for hydrogen fueled internal combustion engines to reduce abnormal combustion events like pre-ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing lubricant additive chemistries are used in hydrogen fueled engines, then the lubricant provides basic lubrication and protection, but pre-ignition and abnormal combustion events occur due to hydrogen's unique combustion properties
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the lubricant additive package. Specifically, it adjusts the types and concentrations of detergent additives (salicylates, phenates, sulfonates, carboxylates) and their metal bases (calcium, magnesium, zinc, boron) to optimize the lubricant's interaction with hydrogen combustion byproducts. This chemical parameter optimization reduces pre-ignition events while maintaining reliable engine operation
Solution Approach 2:
The patent employs composite materials by creating a multi-component additive package that combines different detergent chemistries (salicylates, phenates, sulfonates, carboxylates) with various metal bases. This composite approach leverages the synergistic effects of multiple additives working together to address hydrogen's unique combustion characteristics, providing comprehensive protection against pre-ignition while maintaining lubrication performance
2Object-affected harmful factors
If lubricant compositions are formulated to reduce pre-ignition in hydrogen engines, then abnormal combustion events are reduced, but the formulation complexity and additive package design become more challenging
Solution Approach 1:
The patent applies universality by designing detergent additives that perform multiple functions simultaneously. The selected detergents (salicylates, phenates, sulfonates, carboxylates) not only neutralize acidic combustion byproducts but also modify combustion characteristics to reduce pre-ignition. This multi-functionality reduces the need for separate specialized additives, simplifying the overall formulation approach while effectively addressing abnormal combustion
Solution Approach 2:
The patent uses detergent additives as intermediary substances that mediate between the lubricant base oil and the hydrogen combustion environment. These detergents act as buffers and modifiers, interacting with combustion byproducts and combustion chamber conditions to prevent pre-ignition. This intermediary approach allows the lubricant to adapt to hydrogen's unique properties without requiring complete formulation redesign
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) an overbased metal-containing detergent comprising an overbased metal salicylate detergent, an overbased metal phenate detergent, or combinations thereof with a Total Base Number (KOH/g) greater than or equal to 9 and less than or equal to 500 and included at 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; and iii) 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.