Lubricant Additive Combats Low Speed Pre-Ignition
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Solution Overview
Problem
Turbocharged or supercharged engines often experience low-speed pre-ignition (LSPI) events, which can lead to severe engine damage due to high in-cylinder pressures and advanced combustion phasing. Existing solutions are challenging to implement effectively due to the sporadic and uncontrolled nature of LSPI events.
Innovation Solution
A method involving the use of a lubricant composition containing a primary additive with a specific structure, such as phenolic amines or their salts, and optionally a second additive like an acid, phenol, or antioxidant, to prevent or reduce LSPI events in spark-ignited internal combustion engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
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 harmful substance (engine oil) from the combustion chamber through fuel additive treatment, preventing LSPI by removing the root cause rather than adding detection devices. This approach eliminates the need for complex electronic controls and knock sensors while still addressing the LSPI problem.
Solution Approach 2:
The patent introduces fuel additives as an intermediary substance that modifies the chemical environment in the combustion chamber, preventing auto-ignition of oil droplets. This chemical mediator approach provides detection and prevention without requiring additional electronic sensing devices.
2Reliability
If fuel additives are used to reduce LSPI, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the chemical parameters of the fuel by adding specific additives that modify combustion characteristics. This allows improvement of reliability through chemical composition adjustment rather than requiring precise mechanical manufacturing tolerances in the engine system.
3Reliability
If lubricating oil compositions are used to prevent LSPI, then reliability is improved, but loss of substance increases
Solution Approach 1:
The patent uses fuel additives that serve multiple functions: they prevent LSPI while also acting as lubricity improvers and engine protectants. This multi-functionality allows reliability improvement without requiring separate lubricating oil additives, thereby reducing overall substance consumption and loss.
Data Source
AI summary
Method for preventing or reducing low speed pre-ignition events in a spark- ignited internal combustion engine is provided. The method includes supplying to the engine the lubricant composition comprising a primary additive having a structure given by (I) or a salt thereof. R1 and R2 are independently H, C1 -C20 hydrocarbyl group, carboxyl group, ester, amide, ketone, ether, or hydroxyl group. R3 and R4 are independently H, C1 -C20 hydrocarbyl group, carboxyl group, ester, amide, ketone, 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. Lastly, p is 0 to 2, n is 1 to 5, m is 0 to 2, and p+n+m is less than 6.