Methanol Engine Intake Preheating for Stable Cold-Start Combustion
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Solution Overview
Problem
Internal combustion engines face challenges with the use of alternative liquid fuels like methanol due to evaporation and condensation issues, particularly at idle, low loads, or cold start conditions, leading to unstable combustion and engine performance.
Innovation Solution
Incorporating a preheater to elevate the temperature of liquid fuel before evaporation, an air-fuel-mixing-zone with a heating device, and an intercooler to manage the air-fuel-mixture temperature, ensuring complete evaporation and preventing condensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alternative liquid fuels like methanol are used, then ecological sustainability is improved, but evaporation and condensation problems occur leading to unstable combustion
Solution Approach 1:
The patent applies preliminary action by preheating the liquid fuel before it enters the combustion chamber. The preheater warms the fuel in advance to prevent condensation issues during injection and combustion, particularly at idle and low-load conditions where temperature is insufficient for complete evaporation.
Solution Approach 2:
The patent changes the temperature parameter of the liquid fuel by introducing a preheater. This parameter modification ensures the fuel reaches appropriate temperature for complete evaporation and stable combustion, resolving the condensation problems associated with cold alternative fuels.
2Reliability
If preheater and heating devices are added, then combustion reliability is improved, but device complexity increases
Solution Approach 1:
The patent applies multi-functionality by designing the preheater and heating devices to serve multiple purposes: preheating fuel, preventing condensation, and ensuring complete evaporation. This consolidates multiple functions into integrated components rather than adding separate systems for each function.
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
Enhances combustion reliability by reducing evaporation and condensation problems, resulting in a more robust engine performance, especially at idle, low loads, and cold start conditions.
Implementation Method 1
there is provided at least one preheater configured to preheat the liquid fuel prior to its evaporation
Implementation Method 2
the at least one air-fuel-mixing-zone comprises or is thermally coupled to at least one heating device for heating the air-fuel-mixture
Implementation Method 3
there is provided at least one intercooler configured to cool and to heat air and/or the air-fuel-mixture
Implementation Method 4
at least one air-fuel-mixing-zone configured to mix air with liquid fuel from the liquid fuel supply and to provide an air-fuel-mixture
Data Source
AI summary
An internal combustion engine with at least one combustion chamber, an intake system and optionally at least one prechamber for the at least one combustion chamber. The intake system includes a liquid fuel supply configured to provide a liquid fuel, at least one air-fuel-mixing-zone configured to mix air with liquid fuel from the liquid fuel supply and to provide an air-fuel-mixture, a combustion chamber intake manifold leading into the at least one combustion chamber, and optionally a prechamber intake manifold leading into the at least one prechamber. The internal combustion engine further includes at least one preheater configured to preheat the liquid fuel prior to its evaporation.