Engine fuel injection control
AssigneeNissan Motor Co., Ltd.
InventorsHatsuo Nagaishi, Takahiro Yoshino
Life of this patent
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Abstract
A wall surface of a combustion chamber (5) of an internal combustion engine (1) is divided into a low temperature wall surface (5b) and a high temperature wall surface (5a, 6a, 15a) comprising other components, and behavior models of the fuel adhering to these wall surfaces are created. By determining the fuel ratio which vaporizes from the wall surfaces and burns, and the fuel ratio which is discharged without being burnt, in respective models according to the wall surface temperatures, particularly under transient conditions, these behavior models allow the fuel amount burnt in the combustion chamber (5) and the fuel amount discharged in the exhaust gas to be precisely known.
Claims18
A fuel supply control device for an internal combustion engine which comprises a combustion chamber formed from a low temperature wall surface and a high temperature wall surface, and a fuel supply mechanism which supplies volatile liquid fuel to the combustion chamber, the device comprising:
- a sensor which detects a temperature of the low temperature wall surface;
- a sensor which detects a temperature of the high temperature wall surface;
- and
- a programmable controller programmed to:
- calculate respectively a fuel amount adhering to the low temperature wall surface, a fuel amount adhering to the high temperature wall surface, and a first vaporized fuel amount that is supplied in the form of gas or mist of fine particles in the combustion chamber relative to a fuel amount supplied by the fuel supply mechanism;
- calculate a second vaporized fuel amount which vaporizes from the fuel adhering to the low temperature wall surface and burns, according to the temperature of the low temperature wall surface;
- calculate a third vaporized fuel amount which vaporizes from the fuel adhering to the high temperature wall surface and burns, according to the temperature of the high temperature wall surface;
- calculate a combustion fuel amount in the combustion chamber based on the first vaporized fuel amount, the second vaporized fuel amount, and the third vaporized fuel amount;
- calculate a target fuel injection amount based on the combustion fuel amount;
- and
- control a fuel amount to be supplied by the fuel supply mechanism according to the target fuel injection amount.
A fuel supply control device for an internal combustion engine which comprises a combustion chamber formed from a low temperature wall surface and a high temperature wall surface, and a fuel supply mechanism which supplies volatile liquid fuel to the combustion chamber, the device comprising:
- means for detecting a temperature of the low temperature wall surface;
- means for detecting a temperature of the high temperature wall surface;
- means for calculating respectively a fuel amount adhering to the low temperature wall surface, a fuel amount adhering to the high temperature wall surface, and a first vaporized fuel amount that is supplied in the form of gas or mist of fine particles in the combustion chamber relative to a fuel amount supplied by the fuel supply mechanism;
- means for calculating a second vaporized fuel amount which vaporizes from the fuel adhering to the low temperature wall surface and burns, according to the temperature of the low temperature wall surface;
- means for calculating a third vaporized fuel amount which vaporizes from the fuel adhering to the high temperature wall surface and burns, according to the temperature of the high temperature wall surface;
- means for calculating a combustion fuel amount in the combustion chamber based on the first vaporized fuel amount, the second vaporized fuel amount, and the third vaporized fuel amount;
- means for calculating a target fuel injection amount based on the combustion fuel amount;
- and
- means for controlling a fuel amount to be supplied by the fuel supply mechanism according to the target fuel injection amount.
A fuel supply control method for an internal combustion engine which comprises a combustion chamber formed from a low temperature wall surface and a high temperature wall surface, and a fuel supply mechanism which supplies volatile liquid fuel to the combustion chamber, the method comprising:
- determining a temperature of the low temperature wall surface;
- determining a temperature of the high temperature wall surface;
- calculating respectively a fuel amount adhering to the low temperature wall surface, a fuel amount adhering to the high temperature wall surface, and a first vaporized fuel amount that is supplied in the form of gas or mist of fine particles in the combustion chamber relative to a fuel amount supplied by the fuel supply mechanism;
- calculating a second vaporized fuel amount which vaporizes from the fuel adhering to the low temperature wall surface and burns, according to the temperature of the low temperature wall surface;
- calculating a third vaporized fuel amount which vaporizes from the fuel adhering to the high temperature wall surface and burns, according to the temperature of the high temperature wall surface;
- calculating a combustion fuel amount in the combustion chamber based on the first vaporized fuel amount, the second vaporized fuel amount, and the third vaporized fuel amount;
- calculating a target fuel injection amount based on the combustion fuel amount;
- and
- controlling a fuel amount to be supplied by the fuel supply mechanism according to the target fuel injection amount.
Dependencies are inferred from the claim text.