Pre-Chamber Fuel Vaporization for Low-Energy Active Flushing
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Solution Overview
Problem
Existing fuel supply systems for pre-chambers in spark-ignition engines are inefficient in actively purging them with gaseous fuel, requiring significant drive energy and lacking flexibility in fuel mixture control.
Innovation Solution
A fuel supply system with an evaporator upstream of the pre-chamber, utilizing a high-pressure pump for both pre-chamber and main combustion chamber, allows for the evaporation of liquid fuel into gaseous fuel or fuel-air mixtures, controlled by a regulating mixing valve, and is integrated with a heating device for efficient purging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If liquid fuel is supplied directly to the pre-chamber without evaporation, then drive energy requirements are reduced, but the fuel cannot be effectively ignited and mixed with air in the pre-chamber
Solution Approach 1:
The patent applies phase transition by evaporating liquid fuel into gaseous fuel vapor before supplying it to the pre-chamber. The evaporator converts liquid fuel to gaseous state, enabling effective mixing with air and reliable ignition in the pre-chamber, while the system recycles the evaporated fuel vapor to maintain efficient combustion.
2Ease of operation
If a separate high-pressure pump is used for pre-chamber fuel supply, then fuel delivery control is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by designing the high-pressure pump to serve dual purposes: supplying liquid fuel to the evaporator for pre-chamber operation and supplying liquid fuel directly to the main combustion chamber. This eliminates the need for separate pump systems while maintaining precise fuel delivery control for both combustion zones.
3Device complexity
If fuel is supplied as liquid directly to the pre-chamber, then system simplicity is maintained, but fuel vaporization and mixing with air is insufficient
Solution Approach 1:
The patent applies parameter changes by controlling the evaporation process to adjust the fuel vapor concentration and mixing ratio with air. The system can operate with varying degrees of mixing by controlling the evaporator performance and air-fuel mixture ratio, enabling flexible adaptation to different combustion conditions and engine operating points.
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
Reduces drive energy requirements and enhances flexibility in fuel mixture control, enabling efficient purging of pre-chambers with gaseous fuel or fuel-air mixtures, improving engine performance.
Implementation Method 1
liquid fuel is evaporated in an evaporator before being supplied to the at least one pre-chamber
Implementation Method 2
the evaporator for evaporating the liquid fuel is equipped with a heating device or is connected to a heating device for supplying heat
Implementation Method 3
the evaporator is equipped with a heating device or is connected to a heating device for supplying heat
Implementation Method 4
the evaporator is designed in a heat exchanger configuration, wherein the heat is extracted from the cooling water of the internal combustion engine and supplied to the evaporator
Data Source
Figure 1
AI summary
The invention relates to a fuel supply system (100) for active flushing of at least one antechamber (32) of an internal combustion engine (30) operated by gasoline with a gaseous fuel (K), the internal combustion engine (30) comprising at least one main combustion chamber (31), which is connected to the at least one antechamber (32) at least on the fuel side. According to the invention, a vaporizer (11) is arranged upstream of the at least one antechamber (32).