Multifuel Engine Combustion Mode Adaptation
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Solution Overview
Problem
Conventional multifuel internal combustion engines face performance deterioration due to inconsistent fuel quality and ignitability, leading to suboptimal combustion modes that result in poor emission control and output performance.
Innovation Solution
A multifuel internal combustion engine with a fuel characteristics determining unit and combustion mode setting unit that adjusts between compression hypergolic diffusion, premixed spark-ignition flame propagation, and spark assist compression hypergolic diffusion combustion modes based on the ignitability and anti-knocking performance of the fuel, ensuring optimal combustion according to fuel properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the engine continues to drive in a combustion mode depending on specific fuel properties, then the engine can maintain optimal performance with that fuel, but when the fuel is depleted or quality varies, the engine cannot adapt and performance deteriorates
Solution Approach 1:
The patent implements dynamic combustion mode switching based on real-time fuel property detection. The ECU continuously monitors fuel ignitability and anti-knocking performance, and dynamically adjusts the combustion mode between compression hypergolic diffusion combustion, premixed spark-ignition flame propagation combustion, and spark assist compression hypergolic diffusion combustion to match the current fuel characteristics, ensuring optimal performance across different fuel conditions
Solution Approach 2:
The system changes combustion mode parameters (ignition method, air-fuel mixing ratio, injection timing) based on detected fuel properties. When fuel ignitability is high, compression hypergolic diffusion combustion is used; when anti-knocking performance is excellent, premixed spark-ignition flame propagation combustion is selected; when both are poor, spark assist compression hypergolic diffusion combustion is employed, thereby adapting to varying fuel quality
2Object-generated harmful factors
If the engine uses a fixed combustion mode, then the control system is simple, but the emission control performance and output performance deteriorate when fuel quality varies
Solution Approach 1:
The patent employs a feedback mechanism where the ECU detects fuel properties (ignitability and anti-knocking performance) and uses this information to select and adjust the appropriate combustion mode. This closed-loop control ensures optimal emission control and output performance by continuously adapting to fuel quality variations, while the feedback system itself manages the complexity through automated decision-making algorithms
3Productivity
If the engine switches between different combustion modes based on fuel properties, then optimal performance is maintained, but the control system complexity increases
Solution Approach 1:
The system dynamically switches between three combustion modes (compression hypergolic diffusion, premixed spark-ignition flame propagation, and spark assist compression hypergolic diffusion) based on real-time fuel property assessment. The ECU automatically adjusts ignition timing, air-fuel ratio, and injection parameters to maintain optimal output performance across different fuel conditions, with the control algorithm managing system complexity through automated decision-making
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 engine achieves enhanced output performance, emission control, and fuel consumption by dynamically adjusting combustion modes to match the fuel characteristics, thereby optimizing engine performance across varying fuel qualities.
Implementation Method 1
sets a compression hypergolic diffusion combustion mode when ignitability of the fuel introduced into the combustion chamber is excellent
Implementation Method 2
sets a premixed spark-ignition flame propagation combustion mode when the ignitability of the fuel introduced into the combustion chamber is poor and anti-knocking performance is excellent
Implementation Method 3
sets a spark assist compression hypergolic diffusion combustion mode when both the ignitability and anti-knocking performance of the fuel introduced into the combustion chamber are poor
Data Source
AI summary
A multifuel internal combustion engine includes: fuel characteristics determining unit that determines ignitability and anti-knocking performance of the fuel introduced into the combustion chamber CC; combustion mode setting unit that sets a compression hypergolic diffusion combustion mode when ignitability of the fuel is excellent, sets a premixed spark-ignition flame propagation combustion mode when the ignitability of the fuel is poor and anti-knocking performance is excellent, and sets a spark assist compression hypergolic diffusion combustion mode when both the ignitability and anti-knocking performance of the fuel are poor; and combustion control execution unit that makes the engine to drive in a combustion mode which is set by the combustion mode setting unit.