Control device for internal combustion engine
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTakeshi Tokuda
Life of this patent
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Abstract
The required fuel supply amount of an internal combustion engine is reduced by limiting the throttle opening when a high-pressure fuel pump is required to discharge fuel that exceeds the fuel delivery capacity thereof. Further, when the throttle opening is limited, the operation of a return valve, through which fuel and vapor thereof can be discharged from the high-pressure fuel pump, is prohibited. By performing the abovementioned control, a reduction in the fuel delivery amount of the high-pressure fuel pump due to the operation of the return valve is prevented when there is a possibility that the fuel deliver amount of the high-pressure fuel pump runs short and the fuel supply amount of the internal combustion engine runs short.
Claims9
A control device for an internal combustion engine having a high-pressure fuel pump for pressurizing and delivering fuel and a return valve capable of discharging fuel and vapor of the fuel from the high-pressure fuel pump,
- wherein, when the high-pressure fuel pump is requested to perform a fuel delivery that exceeds its fuel delivery capacity, the return valve is controlled such that actuation of the return valve is limited compared to a case in which such a request is absent.
A control device for an internal combustion engine having a high-pressure fuel pump for pressurizing and delivering fuel and a return valve capable of discharging fuel and vapor of the fuel from the high-pressure fuel pump, the control device limiting the opening degree of a throttle valve of the engine when a requested fuel supply amount of the engine is great,
- wherein, when the opening degree of the throttle valve is limited, the return valve is controlled such that actuation of the return valve is limited compared to a case in which such limitation of the throttle valve opening degree is absent.
Dependencies are inferred from the claim text.