Internal Combustion Engine Transition Mode Fuel Oxidizer Control
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Solution Overview
Problem
Internal combustion engines face limitations in power output due to fuel-air ratio constraints, which restrict acceleration performance and increase nitrogen oxide emissions, and existing exhaust gas recirculation techniques compromise engine power during high-demand conditions.
Innovation Solution
A method and device for operating an internal combustion engine in a transition mode by dynamically adjusting the fuel oxidizer ratio threshold, allowing a temporary increase in fuel supply to enhance power output while managing soot emissions through a controlled particulate filter operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If the fuel oxidizer ratio is limited to prevent excessive soot, then soot emissions are controlled, but engine power is limited
Solution Approach 1:
The patent implements dynamic adjustment of the fuel oxidizer ratio threshold based on operating conditions. The control device temporarily raises the threshold during transition modes when rapid power increase is needed, then returns to the initial threshold once the transition is complete. This dynamic approach allows the system to adapt between emission control and power delivery requirements.
Solution Approach 2:
The control device detects transition modes in advance and proactively raises the fuel oxidizer ratio threshold before the power demand fully manifests. This preliminary action enables the engine to respond more quickly to acceleration requests while maintaining emission compliance during steady-state operation.
2Object-generated harmful factors
If exhaust gas recirculation is used to reduce nitrogen oxides, then nitrogen oxide emissions are reduced, but engine power decreases
Solution Approach 1:
The system dynamically adjusts exhaust gas recirculation rates based on the detected operating mode. During transition modes when rapid power increase is required, the EGR rate is reduced or temporarily stopped to prevent power loss. During steady-state operation, normal EGR rates are maintained for emission control.
Solution Approach 2:
The control device changes the EGR parameter (recirculation rate) based on operating conditions. By detecting transition modes through sensor inputs and control logic, the system modifies the EGR parameter to optimize both power delivery and emission control at different operating points.
3Power
If the fuel air ratio threshold is increased temporarily, then engine power increases rapidly, but soot emissions may increase
Solution Approach 1:
The control device implements periodic monitoring of the fuel oxidizer ratio and engine operating parameters. When the temporary threshold raise is no longer needed, the system returns to the initial threshold, creating a periodic cycle between threshold levels that matches the transient nature of power demands.
Solution Approach 2:
The system uses feedback from engine sensors (mass airflow, engine speed, torque demand) to detect when a transition mode is occurring and when it has ended. This feedback mechanism allows the control device to raise and lower the fuel oxidizer ratio threshold at the appropriate times, ensuring power delivery when needed while minimizing emission impacts.
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 enables rapid increase in engine power during transient operating modes without exceeding soot limits, improving acceleration performance while maintaining regulatory compliance on emissions.
Implementation Method 1
a fuel mixture comprising a fuel medium and an oxidizer, i.e. oxygen typically contained in intake air, are supplied to and ignited in a combustion chamber so as to produce high-temperature and high-pressure gases which apply forces to and thus move a piston
Implementation Method 2
a portion of the engine's exhaust gas is recirculated into the combustion chamber, thereby constituting a part of the fuel mixture. In this way, the amount or quantity of gases inert to combustion is increased in the combustion chamber which act as absorbents of combustion heat, thereby reducing peak temperatures in the combustion chamber and thus the generation of nitrogen oxides
Data Source
AI summary
The present invention refers to a method for operating an internal combustion engine in a transition operating mode, comprising the steps of determining an initial fuel oxidizer ratio threshold and a demanded fuel oxidizer ratio for a fuel mixture to be supplied to a combustion chamber of the engine. If the demanded fuel oxidizer ratio exceeds the initial fuel oxidizer ratio threshold, the engine is temporally operated in a raised response mode, in which a fuel oxidizer ratio threshold is increased from the initial fuel oxidizer ratio threshold to a raised fuel oxidizer ratio threshold, and a fuel mixture having the demanded fuel oxidizer ratio is supplied into the combustion chamber of the engine.