Fuel injection control for internal combustion engine
AssigneeNissan Motor Co., Ltd.
InventorsMasahiko Yuya, Ritsuo Sato, Hiroshi Katoh, Takahisa Koseki
Life of this patent
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Abstract
The startup time of an engine is shortened by performing initial fuel injection after the start of cranking on a cylinder undergoing an intake stroke and a cylinder undergoing an exhaust stroke. After the initial fuel injection, HC emissions are suppressed by performing fuel injection in cylinders undergoing an exhaust stroke. Furthermore when it is determined that initial combustion has not occurred after the initial fuel injection, an additional injection is performed on the cylinder undergoing an intake stroke. In this manner, it is possible to minimize increases in the startup time and adverse effects on exhaust emissions.
Claims11
A fuel injection control device for an internal combustion engine, the engine comprising a crankshaft, a plurality of cylinders which sequentially perform a combustion of fuel and a starter motor which cranks up the engine, each of the cylinders having an intake port and a fuel injector which injects fuel into the intake port and sequentially performing an intake stroke, a compression stroke, an expansion stroke and an exhaust stroke, the device comprising:
- a first sensor which identifies a cylinder in a specific position in a specific stroke and generates a corresponding signal;
- a second sensor which detects combustion of fuel;
- and
- a controller functioning to:
- execute a cylinder-stroke identification identifying a present stroke of each cylinder based on the signal generated by the first sensor;
- command the fuel injectors to simultaneously perform a primary fuel injection for a cylinder in the exhaust stroke and for a cylinder in the intake stroke, on a first execution of the cylinder-stroke identification;
- determine the presence or absence of fuel combustion as a result of the primary fuel injection based on a signal generated by the second sensor;
- and
- command an additional fuel injection, when the fuel combustion is not occurring, to the fuel injector of a cylinder undergoing an intake stroke at the time that the absence of fuel combustion is determined.
A fuel injection control device for an internal combustion engine, the engine comprising a crankshaft, a plurality of cylinders which sequentially perform a combustion of fuel and a starter motor which cranks up the engine, each of the cylinders having an intake port and a fuel injector which injects fuel into the intake port and sequentially performing an intake stroke, a compression stroke, an expansion stroke and an exhaust stroke, the device comprising:
- first means for identifying a cylinder in a specific position in a specific stroke and generating a corresponding signal;
- second means for detecting combustion of fuel;
- third means for executing a cylinder-stroke identification identifying a present stroke of each cylinder based on the signal generated by the first means;
- fourth means for commanding the fuel injectors to simultaneously perform a primary fuel injection for a cylinder in the exhaust stroke and for a cylinder in the intake stroke, on a first execution of the cylinder-stroke identification;
- fifth means for determining the presence or absence of fuel combustion as a result of the primary fuel injection based on a signal generated by the second sensor;
- and
- sixth means for commanding an additional fuel injection, when the fuel combustion is not occurring, to the fuel injector of a cylinder undergoing an intake stroke at the time that the absence of fuel combustion is determined.
A fuel injection controlling method for an internal combustion engine, the engine comprising a crankshaft, a plurality of cylinders which sequentially perform a combustion of fuel and a starter motor which cranks up the engine, each of the cylinders having an intake port and a fuel injector which injects fuel into the intake port and sequentially performing an intake stroke, a compression stroke, an expansion stroke and an exhaust stroke, the method comprising:
- generating a signal identified with a cylinder in a specific position in a specific stroke;
- executing a cylinder-stroke identification identifying a present stroke of each cylinder based on the generated signal;
- commanding the fuel injectors to simultaneously perform a primary fuel injection for a cylinder in the exhaust stroke and for a cylinder in the intake stroke, on a first execution of the cylinder-stroke identification;
- determining the presence or absence of fuel combustion as a result of the primary fuel injection;
- and
- commanding an additional fuel injection, when the fuel combustion is not occurring, to the fuel injector of a cylinder undergoing an intake stroke at the time that the absence of fuel combustion is determined.
Dependencies are inferred from the claim text.