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Methods and systems are provided for injecting fuel into a combustion chamber of an engine. In one example, a system may include a hollow cone-shaped injector and a control unit to control the injector. The control unit may detect the position of an inlet valve and trigger the injection process, whe

Methods and systems are provided for injecting fuel into a combustion chamber of an engine. In one example, a system may include a hollow cone-shaped injector and a control unit to control the injector. The control unit may detect the position of an inlet valve and trigger the injection process, wherein the injector may be configured to spray fuel out of an inlet duct, through an annular gap, and into the combustion chamber of an engine in an injection process.

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1. A method for injecting fuel into a combustion chamber of an engine via first and second injectors, comprising: when engine load is not greater than a threshold, injecting an annular jet of fuel having a geometry of a hollow cone through a first injector coupled to an inlet duct in response to ope

1. A method for injecting fuel into a combustion chamber of an engine via first and second injectors, comprising: when engine load is not greater than a threshold, injecting an annular jet of fuel having a geometry of a hollow cone through a first injector coupled to an inlet duct in response to opening an inlet valve associated with the combustion chamber, and not injecting fuel through a second injector coupled to the inlet duct upstream of the first injector; andwhen engine load is greater than the threshold, initiating injection of fuel through the second injector prior to opening the inlet valve, and then injecting an annular jet of fuel having a geometry of a hollow cone through the first injector in response to opening the inlet valve, while continuing to inject fuel through the second injector. 2. The method of claim 1, wherein an annular gap is formed between the opened inlet valve and an outlet of the inlet duct coupled to the combustion chamber. 3. The method of claim 2, wherein the injected fuel enters the combustion chamber through the annular gap without wetting the inlet valve or the inlet duct. 4. The method of claim 1, further comprising increasing an injection duration of the first injector when engine load exceeds the threshold. 5. The method of claim 1, further comprising, when engine load is greater than the threshold, injecting additional fuel with a third injector, wherein the third injector is a direct injector coupled to the combustion chamber. 6. An engine system comprising: a combustion chamber;an inlet duct associated with the combustion chamber;an inlet valve;a hollow cone injector coupled to the inlet duct upstream of the inlet valve;a port injector coupled to the inlet duct upstream of the hollow cone injector; anda controller configured with computer readable instructions stored on non-transitory memory for: adjusting timing of actuating the inlet valve;monitoring an engine load;estimating a target amount of fuel based on the engine load;injecting a first amount of fuel via the hollow cone injector only while the inlet valve is open, the first amount of fuel discharged from the hollow cone injector as an annular jet having a geometry of a hollow cone; andin response to the target amount of fuel being greater than a threshold, injecting a second amount of fuel via the hollow cone injector and the port injector, including initiating injection of fuel via the port injector prior to opening of the inlet valve, and in response to opening of the inlet valve, continuing to inject fuel via the port injector and initiating injection of fuel via the hollow cone injector. 7. The engine system of claim 6, wherein the fuel injected via the hollow cone injector enters the combustion chamber through an annular gap created between the open inlet valve and an outlet of the inlet duct coupled to the combustion chamber. 8. The engine system of claim 6, wherein the controller is further configured to increase a duration of inlet valve opening in response to the target amount of fuel being greater than the threshold. 9. The engine system of claim 8, wherein the controller is further configured to increase a duration of fuel injection via the hollow cone injector in response to the target amount of fuel being greater than the threshold. 10. The engine system of claim 6, further comprising a direct injector coupled to the combustion chamber, wherein injecting the second amount of fuel further includes directly injecting fuel into the combustion chamber via the direct injector in response to closing of the inlet valve. 11. An engine system comprising: a combustion chamber;an inlet duct associated with the combustion chamber;an inlet valve;a first injector coupled to the inlet duct upstream of the inlet valve, wherein fuel is discharged from the first injector as an annular jet having a geometry of a hollow cone;a second injector coupled to the inlet duct upstream of the first injector;a third injector coupled directly to the combustion chamber; anda controller configured with computer readable instructions stored on non-transitory memory for: monitoring an engine load;determining an amount of fuel to be injected for each injector in response to a change in the engine load and a status of the inlet valve, including, when the engine load is not greater than a threshold and the inlet valve is open, injecting fuel with the first injector and not injecting fuel with the second and third injectors;when the engine load is greater than the threshold, initiating injection of fuel with the second injector prior to the inlet valve opening, continuing to inject fuel with the second injector and initiating injection of fuel with the first injector in response to the inlet valve opening, stopping injection of fuel with the second injector prior to the inlet valve closing while continuing to inject fuel with the first injector, and in response to the inlet valve closing, stopping injection of fuel with the first injector in response and initiating injection of fuel with the third injector. 12. The method of claim 2, wherein during the fuel injection, the inlet valve is arranged within a hollow void formed by the hollow cone geometry of the injected fuel, and wherein the injected fuel is directed solely into the annular gap.