A method for controlling fuel injection of a combustion engine and a corresponding system includes providing at least a first predetermined air-fuel mixture map and determining a first air-fuel ratio based on at least one engine operating parameter and the at least first predetermined air-fuel mixtu
A method for controlling fuel injection of a combustion engine and a corresponding system includes providing at least a first predetermined air-fuel mixture map and determining a first air-fuel ratio based on at least one engine operating parameter and the at least first predetermined air-fuel mixture map; determining a second air-fuel ratio that is offset with a first constant value from the first air-fuel ratio, determining if a first operating mode or a second operating mode is selected; controlling engine fuel injection according to the first air-fuel ratio when a currently requested fueling rate results in a smaller air-fuel ratio than the first air-fuel ratio and the first operating mode is selected; or alternatively controlling engine fuel injection according to the second air-fuel ratio when a currently requested fueling rate results in a smaller air-fuel ratio than the second air-fuel ratio and the second operating mode is selected.
대표청구항▼
1. Method for controlling fuel injection of a combustion engine having at least a first operating mode and a second operating mode, which method comprises the steps of: providing at least a first predetermined air-fuel mixture map;providing a constant air-fuel mixture map offset value for the second
1. Method for controlling fuel injection of a combustion engine having at least a first operating mode and a second operating mode, which method comprises the steps of: providing at least a first predetermined air-fuel mixture map;providing a constant air-fuel mixture map offset value for the second operating mode;determining a first air-fuel ratio based on at least one engine operating parameter and the at-least-first predetermined air-fuel mixture map;adding the constant air-fuel mixture map offset value to the first air-fuel ratio to form a second air fuel ratio;selecting the first operating mode and, when the first operating mode is selected, controlling engine fuel injection according to the first air-fuel ratio in response to requesting a currently requested fueling rate that results in a smaller air-fuel ratio than the first air-fuel ratio; andselecting the second operating mode and, when the second operating mode is selected, controlling engine fuel injection according to the second air-fuel ratio in response to requesting a currently requested fueling rate that results in a smaller air-fuel ratio than the second air-fuel ratio. 2. Method according to claim 1, wherein the at least first predetermined air-fuel mixture map is configured to operate as an exhaust gas smoke limiter. 3. Method according to claim 1, wherein the at least first predetermined air-fuel mixture map is provided with air-fuel mixture data for a range of engine speed and a range of engine load conditions. 4. Method according to claim 1, comprising the steps of: providing a second constant air-fuel mixture map offset value for a third operating mode of the engine,determining if the first operating mode, the second operating mode or the third operating mode is selected;adding the second constant air-fuel mixture map offset value to the first air-fuel ratio to form a third air fuel ratio;wherein the second constant air-fuel mixture map offset value is larger than the first constant air-fuel mixture map offset value, and controlling engine fuel injection according to the third air-fuel ratio when the currently requested fueling rate results in a smaller air-fuel ratio than the third air-fuel ratio and the third operating mode is selected. 5. Method according to claim 1, wherein at least one of the first and the second constant air-fuel mixture map offset value is within the range of 0.2-4.0. 6. Method according to claim 1, comprising the steps of additionally providing at least a second predetermined air-fuel mixture map, wherein the at least first and second air-fuel mixture map correspond to different predetermined engine operating states, and determining the first air-fuel ratio based on at least one engine operating parameter and the currently selected air-fuel mixture map. 7. Method according to claim 1, comprising the step of controlling at least an EGR valve for temporarily enabling increased air mass flow rate into the engine when a current air-fuel ratio is within a first constant range of the first air-fuel ratio and the first operating mode is selected, andcontrolling at least the EGR valve for temporarily enabling increased air mass flow rate into the engine when the current air-fuel ratio is within the first constant range of the second air-fuel ratio and the second operating mode is selected. 8. Method according to claim 7, wherein the first constant range is defined by the values 0.0-10.0. 9. Method according to claim 1, wherein controlling engine fuel injection according to a specific air-fuel ratio comprises the steps of: determining a minimum allowed air-fuel ratio based on currently selected predetermined air-fuel mixture map, current engine load, current engine speed, and currently selected operating mode;continuously monitoring air mass flow rate into the engine;determining a maximal allowed fueling rate based on the minimum allowed air-fuel ratio and the air mass flow rate;limiting engine fueling rate to the maximal allowed fueling rate if a currently requested fueling rate is greater than the maximal allowed fueling rate. 10. Method according to claim 1, the method comprising the step of controlling engine fuel injection according to a currently requested fueling rate when the currently requested fueling rate results in an air-fuel ratio that is greater than or equal to the first air-fuel ratio and the first operating mode is selected. 11. Fuel injection system for a combustion engine, the fuel injection system comprising a control unit and at least a first predetermined air-fuel mixture map, wherein the fuel injection system comprises an operator input selector that is configured to be selectable between at least a first operating mode and a second operating mode, and the system comprises a first constant air-fuel mixture map offset value for the second operating mode; the control unit being configured to determine a first air-fuel ratio based on at least one engine operating parameter and the at least first predetermined air-fuel mixture map;determine a second air-fuel ratio by adding the first constant air-fuel mixture map offset value to the first air-fuel ratio,control engine fuel injection according to the first air-fuel ratio in response to requesting a currently requested fueling rate that results in a smaller air-fuel ratio than the first air-fuel ratio when the first operating mode is selected; andcontrol engine fuel injection according to the second air-fuel ratio in response to requesting a currently requested fueling rate results in a smaller air-fuel ratio than the second air-fuel ratio when the second operating mode is selected. 12. Fuel injection system according to claim 11, wherein the at least first predetermined air-fuel mixture map is configured to operate as an exhaust gas smoke limiter. 13. Fuel injection system according to claim 11, wherein the at least first predetermined air-fuel mixture map is provided with air-fuel mixture data for a range of engine speed and a range of engine load conditions. 14. Fuel injection system according to claim 11, wherein the operator input selector is configured to be selectable between at least a first operating mode, a second operating mode, and a third operating mode, and the system comprises a second constant air-fuel mixture map offset value for the third operating mode, the control unit being configured to determine a third air-fuel ratio by adding the second constant air-fuel mixture map offset value to the first air-fuel ratio, wherein the second air-fuel mixture map offset value is larger than the first constant air-fuel mixture map offset value, andcontrolling engine fuel injection according to the third air-fuel ratio when the currently requested fueling rate results in a smaller air-fuel ratio than the third air-fuel ratio and the third operating mode is selected. 15. Fuel injection system according to claim 11 wherein at least one of the first and the second constant air-fuel mixture map offset value is within the range of 0.2-4.0. 16. Fuel injection system according to claim 11, wherein the fuel injection system additionally comprises at least a second predetermined air-fuel mixture map, wherein each of the at least first and second air-fuel mixture map corresponds to different predetermined engine operating states, the control unit being configured to determine the first air-fuel ratio based on at least one engine operating parameter and the currently selected air-fuel mixture map. 17. Fuel injection system according to claim 11, wherein the control unit being is configured to control at least an EGR valve for temporarily enabling increased air mass flow rate into the engine when a current air-fuel ratio is within a first constant range of the first air-fuel ratio and the first operating mode is selected; andcontrol at least the EGR valve for temporarily enabling increased air mass flow rate into the engine when the current air-fuel ratio is within the first constant range of the second air-fuel ratio and the second operating mode is selected. 18. Fuel injection system according to claim 17, wherein the first constant range is defined by the values 0.0-10.0. 19. Fuel injection system according to claim 11, wherein the control unit, for the purpose of controlling engine fuel injection according to a specific air-fuel ratio, is configured to determine a minimum allowed air-fuel ratio based on currently selected predetermined air-fuel mixture map, current engine load, current engine speed, and currently selected operating mode;continuously monitor air mass flow rate into the engine;determine a maximal allowed fueling rate based on the minimum allowed air-fuel ratio and the air mass flow rate;limit engine fueling rate to the maximal allowed fueling rate if a currently requested fueling rate is greater than the maximal allowed fueling rate. 20. A computer programmed for performing all the steps of claim 1. 21. A computer program product comprising a program stored on a non-transitory computer readable medium for performing all the steps of claim 1. 22. A computer system for implementing a method for controlling fuel injection of a combustion engine, which method comprises the steps of: providing at least a first predetermined air-fuel mixture map,providing an operating mode selector allowing selection between at least a first operating mode and a second operating mode of the engine, andproviding a constant fuel-mixture map offset value for the second operating mode, anddetermining a first air-fuel ratio based on at least one engine operating parameter and the at-least-first predetermined air-fuel mixture map;adding the constant fuel-mixture map offset value to the first air-fuel ratio to form a second air fuel ratio;selecting the first operating mode and, when the first operating mode is selected, controlling engine fuel injection according to the first air-fuel ratio in response to requesting a currently requested fueling rate that results in a smaller air-fuel ratio than the first air-fuel ratio; andselecting the second operating mode and, when the second operating mode is selected, controlling engine fuel injection according to the second air-fuel ratio in response to requesting a currently requested fueling rate results in a smaller air-fuel ratio than the second air-fuel ratio. 23. Method according to claim 1, the method comprising the step of controlling engine fuel injection according to currently requested fueling rate when the currently requested fueling rate results in an air-fuel ratio that is greater than or equal to the second air-fuel ratio and the second operating mode is selected.
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이 특허에 인용된 특허 (13)
Davis Robert M. (North Beach AUX) Smith Darren A. (Doubleview AUX) Thompson Ian R. (Duncraig AUX), Air fuel ratio control.
Iida Kazumasa,JPX ; Miyamoto Katsuhiko,JPX ; Yoshida Masato,JPX, Control device for cylinder-injection and spark-ignition type internal combustion engines.
Kolmanovsky Ilya V. ; Jankovic Mrdjan J. ; Van Nieuwstadt Michiel J. ; Moraal Paul Eduard,DEX, Fuel limiting method in diesel engines having exhaust gas recirculation.
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