High-pressure pump control device for internal-combustion engine
AssigneeDenso Corporation
InventorYasuo Hirata
Life of this patent
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Abstract
A high-pressure pump control device is applied to an internal combustion engine including a high-pressure pump supplied with fuel discharged from a low-pressure pump and an injector supplied with fuel discharged from the high-pressure pump. The high-pressure pump control device includes a prediction unit predicting whether a discharge quantity of the high-pressure pump exceeds a discharge quantity of the low-pressure pump and a restricting unit executing a discharge quantity restriction control to restrict a discharge quantity of the high-pressure pump not to exceed a predetermined value when the prediction unit predicts that a discharge quantity of the high-pressure pump exceeds a discharge quantity of the low-pressure pump.
Claims12
A high-pressure pump control device for an internal combustion engine including a high-pressure pump supplied with fuel discharged from a low-pressure pump and an injector supplied with fuel discharged from the high-pressure pump, comprising:
- a prediction unit predicting whether a discharge quantity of the high-pressure pump exceeds a discharge quantity of the low-pressure pump;
- a restricting unit executing a discharge quantity restriction control to restrict a discharge quantity of the high-pressure pump not to exceed a predetermined value when the prediction unit predicts that a discharge quantity of the high-pressure pump exceeds a discharge quantity of the low-pressure pump;
- and
- a fuel pressure acquisition unit acquiring a fuel pressure that is a pressure of the fuel supplied to the injector, wherein:
- when the high-pressure pump and the low-pressure pump are operating without abnormality, the prediction unit predicts whether the discharge quantity of the high-pressure pump exceeds the discharge quantity of the low-pressure pump, based on a fuel pressure deviation that is a deviation between the fuel pressure and a target fuel pressure.
A high-pressure pump control device for an internal combustion engine including a high-pressure pump supplied with fuel discharged from a low-pressure pump and an injector supplied with fuel discharged from the high-pressure pump, comprising:
- a prediction unit predicting whether a discharge quantity of the high-pressure pump exceeds a discharge quantity of the low-pressure pump;
- and
- a restricting unit executing a discharge quantity restriction control to restrict a discharge quantity of the high-pressure pump not to exceed a predetermined value when the prediction unit predicts that a discharge quantity of the high-pressure pump exceeds a discharge quantity of the low-pressure pump, wherein:
- when the high-pressure pump and the low-pressure pump are operating without abnormality, the prediction unit predicts whether the discharge quantity of the high-pressure pump exceeds the discharge quantity of the low-pressure pump, based on a target fuel pressure.
A high-pressure pump control device for an internal combustion engine including a high-pressure pump supplied with fuel discharged from a low-pressure pump and an injector supplied with fuel discharged from the high-pressure pump, comprising:
- a fuel pressure sensor configured to detect a fuel pressure that is a pressure of the fuel supplied to the injector;
- a controller including a computer processor for executing computer program instructions read from a non-transitory computer-readable storage medium such that control device is at least configured to perform:
- a prediction which predicts whether a discharge quantity of the high-pressure pump exceeds a discharge quantity of the low-pressure pump;
- a restriction which executes a discharge quantity restriction control to restrict a discharge quantity of the high-pressure pump not to exceed a predetermined value when the prediction predicts that a discharge quantity of the high-pressure pump exceeds a discharge quantity of the low-pressure pump;
- and
- abnormality prevention which prevents an abnormality in the high pressure pump when the prediction predicts that the discharge quantity of the high-pressure pump exceeds the discharge quantity of the low-pressure pump, wherein the prediction that predicts that the discharge quantity of the high-pressure pump exceeds the discharge quantity of the low-pressure pump is based on a fuel pressure deviation that is a deviation between the fuel pressure and a target fuel pressure.
Dependencies are inferred from the claim text.