Biodiesel Fuel Injection Compensation for Engine Emissions
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Solution Overview
Problem
The varying concentrations of biodiesel in diesel fuel lead to decreased engine fuel economy and increased NOx emissions due to its lower energy density and higher oxygen content, which are not effectively detected and compensated by existing technologies.
Innovation Solution
Adjusting the amount of fuel injected into engine cylinders and the proportions of pilot and main fuel injections based on biodiesel concentration, with the main fuel injection increasing at a faster rate than pilot injections, to compensate for biodiesel's energy content and reduce emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If biodiesel is combusted in an engine, then oxygen content increases and emissions may improve, but energy density decreases leading to degraded fuel economy and increased NOx emissions
Solution Approach 1:
The system dynamically adjusts fuel injection parameters (amount, timing, pilot-to-main ratio) based on real-time detection of biodiesel concentration in the fuel supply. This allows the engine control system to adapt injection strategies to compensate for biodiesel's lower energy density while managing emissions, resolving the contradiction between fuel economy and harmful emissions.
Solution Approach 2:
The invention changes key combustion parameters including fuel injection amount, injection timing, and pilot-to-main injection ratio in response to detected biodiesel concentration. By adjusting these parameters, the system compensates for biodiesel's lower energy density to maintain fuel economy while managing NOx emissions through optimized combustion control.
2Adaptability or versatility
If biodiesel concentration in fuel varies, then fuel composition changes, but existing detection and compensation technologies are insufficient
Solution Approach 1:
The system implements a feedback mechanism where biodiesel concentration in the fuel supply is detected and this information is used to adjust fuel injection parameters. The detection system provides real-time data on fuel composition changes, and the control system responds by modifying injection strategies, creating a closed-loop system that adapts to varying biodiesel concentrations.
3Power
If driver demand torque increases to compensate for lower energy content of biodiesel, then power output is maintained, but boost pressure and injection pressure increase leading to higher NOx emissions
Solution Approach 1:
The system performs preliminary adjustment of fuel injection parameters based on detected biodiesel concentration before combustion occurs. By pre-adjusting the pilot-to-main injection ratio and timing based on fuel composition analysis, the system prepares the combustion chamber conditions to achieve efficient combustion of biodiesel without requiring excessive boost pressure or injection pressure, thereby maintaining power while reducing NOx emissions.
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 reduces NOx emissions and improves fuel economy by optimizing fuel injection in response to biodiesel concentration, potentially conserving urea and decreasing particulate emissions.
Implementation Method 1
adjusting an amount of fuel injected into engine cylinders... adjusting an amount of fuel injected in pilot fuel injections and an amount of fuel injected in a main fuel injection
Implementation Method 2
Biodiesel has a higher concentration of oxygen that is carried within the fuel... when biodiesel is combusted in an engine... to produce an equivalent amount of power as compared to when fossil based diesel fuel is combusted
Data Source
AI summary
Methods and systems for adjusting a plurality of fuel injections supplied to a cylinder during a cycle of the cylinder are described. In one example, fuel amounts are adjusted in response to a biodiesel concentration in fuel supplied to an engine.