Cetane Improvers for Low Temperature Combustion Engine Speed
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Solution Overview
Problem
Internal combustion engines operating in low temperature combustion modes, such as homogeneous charge compression ignition, face limitations in maximum operating speed due to inadequate fuel reactivity, leading to instability and reduced speed-load range, especially when using conventional pump gasoline with higher Research Octane Number (RON).
Innovation Solution
Incorporating one or more cetane improvers, such as 2-ethylhexyl nitrate (EHN) and di-tert butyl peroxide (DTBP), into gasoline with a RON greater than 85 to enhance fuel reactivity and increase the maximum operating speed in low temperature combustion modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If conventional pump gasoline with higher RON is used in low temperature combustion mode, then emissions are reduced and efficiency is improved, but maximum operating speed is limited due to inadequate fuel reactivity
Solution Approach 1:
The invention changes the chemical reactivity parameters of the fuel by adding cetane improvers (such as 2-ethylhexyl nitrate and di-tert butyl peroxide) to gasoline with RON greater than 85. This modifies the ignition characteristics and reaction kinetics of the fuel, enabling faster combustion rates that can sustain higher engine speeds while maintaining low temperature combustion benefits
Solution Approach 2:
The invention creates a composite fuel formulation by combining conventional pump gasoline (providing low emissions and high efficiency) with cetane improvers (providing enhanced reactivity). This composite fuel composition integrates the advantages of both components: the base gasoline maintains low temperature combustion for reduced emissions, while the additives boost ignition speed to enable higher operating speeds
2Speed
If fuel reactivity is increased to support higher engine speeds, then maximum operating speed increases, but combustion stability may be compromised
Solution Approach 1:
The invention carefully adjusts the reactivity parameters by using specific cetane improvers at controlled concentrations. These additives increase ignition speed while the low temperature combustion mode and optimized fuel-to-air ratio maintain combustion stability, achieving a balance between speed and stability
3Power
If ignition delay is reduced to increase power output, then speed-load range expands, but fuel composition complexity increases
Solution Approach 1:
The invention uses small amounts of chemical additives (cetane improvers) that are inexpensive and easily mixed into the fuel. These short-lived chemical agents provide temporary but effective ignition enhancement during combustion, reducing ignition delay and expanding the speed-load range without requiring permanent structural modifications to the engine or complex fuel delivery systems
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 use of cetane improvers significantly increases the maximum operating speed of internal combustion engines, improving power output and drivability by reducing ignition delay, thus expanding the engine's speed range and reducing the complexity of transmission systems.
Implementation Method 1
The use of cetane improvers significantly increases the maximum operating speed of internal combustion engines, improving power output and drivability by reducing ignition delay
Data Source
AI summary
Disclosed herein is a method for increasing the maximum operating speed of an internal combustion engine operated in a low temperature combustion ignition mode, the method comprising operating the engine with a fuel composition comprising (a) gasoline having a Research Octane Number (RON) greater than 85 and (b) one or more cetane improvers.