Hydride Donator Additives for Combustion Engine LSPI Reduction
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Solution Overview
Problem
Small, high-output combustion engines are susceptible to low speed pre-ignition (LSPI) events, which can lead to catastrophic engine failure due to increased cylinder peak pressure, limiting their optimization for lower engine speeds.
Innovation Solution
The use of fuel and lubricant compositions containing greater than 50 wt.% hydrocarbon fuel or base oil combined with a minor amount of organic hydride-based reductants, such as dihydropyridine, reduced nicotinamide adenine dinucleotide, and aryl benzoimidazoline, which act as ashless additives to reduce LSPI by stabilizing oxidative unstable species.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If engine manufacturers increase boost pressures and down-speed engines to achieve higher power density and reduce frictional losses, then engine performance is improved, but susceptibility to low speed pre-ignition events increases
Solution Approach 1:
The patent introduces organic hydride-based reductants as intermediary substances in the fuel composition. These reductants act as mediators that chemically interact with oxidative unstable species formed during combustion, converting them into stable products and preventing LSPI events. This allows the engine to operate at high power density without suffering from pre-ignition reliability issues.
Solution Approach 2:
The patent modifies the chemical composition parameters of the fuel by incorporating organic hydride-based reductants at specific concentrations (0.01-5 wt%). This parameter change alters the combustion chemistry to suppress the formation of oxidative unstable species, thereby resolving the contradiction between high power output and pre-ignition susceptibility.
2Productivity
If engine manufacturers operate engines at low speed and high load to optimize torque, then torque efficiency is improved, but catastrophic engine failure risk increases due to pre-ignition
Solution Approach 1:
The patent applies preliminary anti-action by incorporating organic hydride-based reductants in the fuel composition before combustion occurs. These reductants proactively prevent the formation of oxidative unstable species that would otherwise lead to uncontrolled cylinder peak pressure and pre-ignition events during low speed high load operation.
Solution Approach 2:
The patent converts potentially harmful oxidative unstable species into beneficial stable products through the action of organic hydride-based reductants. This transformation eliminates the harmful effect of pre-ignition while maintaining the desired low speed high load operating conditions for optimal torque efficiency.
3Adaptability or versatility
If conventional fuel compositions are used in high-output engines, then fuel compatibility is maintained, but LSPI events occur leading to engine damage
Solution Approach 1:
The patent creates a composite fuel composition by combining conventional hydrocarbon fuels with organic hydride-based reductants. This composite formulation maintains compatibility with existing fuel infrastructure and engine systems while adding the protective function of LSPI prevention, thereby resolving the contradiction between fuel adaptability and engine reliability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The compositions effectively reduce LSPI events, minimizing engine damage and allowing for better engine torque optimization at lower speeds by inhibiting undesirable ignition in combustion engines.
Implementation Method 1
organic hydride donors as fuel or lubricant additives
Implementation Method 2
one or more of organic hydride-based reductant
Data Source
AI summary
Fuel and lubricant compositions are provided that contain an organic hydride-based reductant. Methods for preventing or reducing low speed pre-ignition events in an internal combustion engines using these compositions are also provided.