Dual Injection Engine Fuel Control for Scavenging
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Solution Overview
Problem
Internal combustion engines with intake manifold injection and direct injection face issues of uncombusted fuel being flushed into the exhaust gas, leading to increased component stress, poor emission values, and excessive catalytic converter temperatures due to fuel deposition and scavenging, which complicates turbocharger response and emission control.
Innovation Solution
A method that assesses exhaust gas parameters such as temperature, pressure, and lambda value to detect uncombusted fuel, adjusting operating parameters like fuel quantity, injection timing, and valve control to prevent fuel deposition and scavenging, thereby optimizing combustion chamber filling and maintaining favorable emission characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the intake valve and exhaust valve are opened simultaneously for scavenging to improve turbocharger response, then the flow values in the exhaust pipe and turbocharger are improved, but uncombusted fuel is flushed through the combustion chamber into the exhaust gas, causing increased component stress, poor emission values, and excessively high catalytic converter temperatures
Solution Approach 1:
The control unit determines the amount of uncombusted fuel in the intake manifold before the scavenging event occurs. Based on this preliminary assessment, the injection timing is adjusted in advance to prevent fuel from being flushed into the exhaust during the simultaneous valve opening phase, while still allowing the scavenging flow to improve turbocharger response.
Solution Approach 2:
The system uses sensors to detect parameters correlated with uncombusted fuel in the exhaust gas (such as exhaust gas temperature, lambda value, or pressure). This feedback information is fed back to the control unit, which then adjusts the injection timing to optimize the balance between scavenging benefits and preventing fuel flush, creating a closed-loop control system.
2Object-generated harmful factors
If intake manifold injection is used at medium load ranges, then emission values are improved, but fuel deposition in the intake manifold occurs, leading to fuel being flushed through the combustion chamber during scavenging
Solution Approach 1:
The injection timing is made dynamic rather than fixed. The control unit continuously adjusts the injection timing based on real-time detection of uncombusted fuel amounts and operating conditions. This dynamic adjustment allows the system to maintain the emission benefits of intake manifold injection while preventing fuel deposition and subsequent flushing during scavenging events.
Solution Approach 2:
The system changes the injection timing parameter in response to detected fuel accumulation conditions. When uncombusted fuel is detected in the intake manifold, the injection timing is adjusted to occur closer to the intake valve closing event, ensuring fuel is delivered just in time for combustion and not deposited in the manifold, thereby maintaining emission benefits while preventing fuel loss.
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 stress on engine components, improves emission values, and maintains the operational benefits of intake manifold and direct injection systems by accurately adjusting fuel introduction and valve timing to prevent uncombusted fuel from entering the exhaust gas, thus enhancing turbocharger performance and emission control.
Implementation Method 1
A value of at least one parameter that is correlated with an exhaust gas of a combustion chamber and that is influenced by flushing of uncombusted fuel through the combustion chamber into the exhaust gas is ascertained
Implementation Method 2
A value of at least one parameter that is correlated with an exhaust gas of a combustion chamber and that is influenced by flushing of uncombusted fuel through the combustion chamber into the exhaust gas is ascertained
Implementation Method 3
A value of at least one parameter that is correlated with an exhaust gas of a combustion chamber and that is influenced by flushing of uncombusted fuel through the combustion chamber into the exhaust gas is ascertained
Implementation Method 4
a fuel quantity that is introduced via direct injection
Implementation Method 5
an intake valve and an exhaust valve of a combustion chamber can be opened simultaneously to obtain higher flow values in the exhaust pipe
Implementation Method 6
an intake valve and an exhaust valve of a combustion chamber can be opened simultaneously to obtain higher flow values in the exhaust pipe and thus in the turbocharger
Implementation Method 7
internal combustion engine with intake manifold injection and direct injection
Data Source
AI summary
In a method for operating an internal combustion engine with intake manifold injection and direct injection, a value of at least one parameter that is correlated with an exhaust gas of a combustion chamber of the internal combustion engine and that is influenced by purging of uncombusted fuel through the combustion chamber into the exhaust gas is ascertained, and, if it is concluded, based on the ascertained value of the at least one parameter, that uncombusted fuel is purged, at least one operating parameter for filling the combustion chamber is adjusted.