Phenolic Amine Additive Mitigates LSPI in Spark-Ignited Engines
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Solution Overview
Problem
Turbocharged or supercharged engines experience stochastic pre-ignition (LSPI) events, leading to severe engine damage due to auto-ignition of engine oil droplets, which are difficult to identify and mitigate effectively with existing technologies.
Innovation Solution
A fuel and lubricating oil composition containing a hydrocarbon fuel with a phenolic amine additive, specifically phenolic amine structures or their salts, which are designed to reduce LSPI by incorporating a ring moiety and various hydrocarbyl, carboxyl, ether, or hydroxyl groups, used in conjunction with secondary additives to synergistically minimize engine knocking and pre-ignition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic controls and knock sensors are used to address LSPI, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent extracts the LSPI mitigation function from the engine control system by incorporating it directly into the fuel composition through phenolic amine additives. This removes the need for complex electronic detection and control systems while maintaining the ability to prevent LSPI events.
Solution Approach 2:
The phenolic amine additive acts as an intermediary substance that chemically interacts with oil droplets in the combustion chamber to prevent auto-ignition. This chemical mediator approach replaces the need for electronic sensors and controls, simplifying the overall system.
2Reliability
If fuel and lubricating oil compositions are developed to reduce LSPI, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the chemical parameters of the fuel and lubricating oil compositions by incorporating phenolic amine additives with specific molecular structures. This allows achievement of reliable LSPI mitigation through compositional modification rather than precise manufacturing control of engine parameters.
Data Source
AI summary
Fuel composition for preventing or reducing low speed pre-ignition events in a spark-ignited internal combustion engine is provided. The fuel composition includes a hydrocarbon fuel boiling the gasoline or diesel range and a primary additive having a structure given by (I) or a salt thereof. A is a ring moiety; R1 and R2 are independently H, C1 -C20 hydrocarbyl group, carboxyl group, ether, or hydroxyl group. R3 and R4 are independently H, C1 -C20 hydrocarbyl group, carboxyl group, ether, amino, or hydroxyl group or wherein R3 and R4 are part of a cyclic group. R5 is C1 -C100 hydrocarbyl group, carboxyl group, ether, or hydroxyl group; and p is 0 to 2, n is 1 to 3, m is 1 to 3, and p+n+m is less than 5.