Combustion Engine Air-Fuel Temperature Control for Knock Prevention
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Solution Overview
Problem
Existing combustion engines face challenges with knock, which can occur when the air-fuel mixture self-ignites prematurely, leading to potential engine damage. Current methods to address knock, such as altering engine parameters, require knock to occur first, which can still harm the engine over time, especially with fuels of low methane number.
Innovation Solution
The proposed solution involves controlling the temperature of the air-fuel mixture to prevent knock by adjusting the temperature of the air, fuel, or air-fuel mixture before it enters the combustion chamber, thereby maintaining optimal knock resistance and probability without altering the fuel's composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If knock control methods are applied using knock sensors to detect and trigger parameter alterations, then knock resistance is increased, but knock must still occur at harmful levels for a period of time which can still harm the engine
Solution Approach 1:
The system performs preliminary detection of knock indicators (vibrations, pressure waves, acoustic signals) before actual knock occurs, and preemptively adjusts ignition timing or fuel injection parameters to prevent knock from happening in the first place, rather than reacting after knock has already damaged the engine
Solution Approach 2:
The system continuously monitors engine parameters and knock indicators, and uses this feedback to dynamically adjust ignition timing and fuel injection in real-time to maintain optimal knock resistance while preventing engine damage
2Reliability
If the combustion engine is derated to avoid knock, then knock probability decreases, but engine power and efficiency are reduced
Solution Approach 1:
The system dynamically adjusts engine parameters (ignition timing, fuel injection quantity and timing) in real-time based on detected knock indicators and operating conditions, allowing the engine to operate at full power when knock is not present while preventing knock when indicators are detected, rather than permanently derating the engine
Solution Approach 2:
The system changes key combustion parameters (ignition timing angle, fuel injection timing and quantity) based on detected knock indicators to prevent knock while maintaining engine power output, rather than reducing power to avoid knock
3Productivity
If fuels with low methane numbers are supplied, then combustion speed and efficiency decrease, but knock resistance is reduced making the engine more susceptible to knock
Solution Approach 1:
The system adjusts combustion parameters (ignition timing, injection timing and quantity, compression ratio) based on the detected methane number of the fuel being used, optimizing both combustion efficiency and knock resistance for each fuel type rather than requiring a fixed fuel specification
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
This approach allows the combustion engine to operate efficiently and prevent knock by precisely controlling the knock resistance and probability, even when fuel quality varies, thus maintaining constant engine performance and reducing the risk of engine damage.
Implementation Method 1
at least one temperature adjusting means (5) for cooling or heating the air (3) and/or fuel (4) and/or air-fuel mixture (2)
Data Source
AI summary
A combustion engine for combustion of an air-fuel mixture containing air and fuel, comprising at least one temperature adjusting means for cooling or heating the air, fuel, and/or air-fuel mixture and a control unit configured to determine the methane number and/or hydrogen content of the fuel and/or air-fuel mixture, wherein the control unit is configured to control a temperature of the air, fuel and/or air-fuel mixture based on the determined methane number and/or hydrogen content by controlling the at least one temperature adjusting means.