Internal-combustion engines – Charge forming device – Including means responsive to instantaneous change in engine...
Reexamination Certificate
1999-06-10
2001-03-27
Kwon, John (Department: 3747)
Internal-combustion engines
Charge forming device
Including means responsive to instantaneous change in engine...
C123S478000
Reexamination Certificate
active
06205977
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a fuel injection control apparatus of a multicylinder internal combustion engine and, more particularly, to a fuel injection control apparatus having a function to regulate the quantity of fuel injection between cylinders.
2. Description of the Related Art
A multicylinder internal combustion engine provided with an injector for each cylinder has a fuel injection control apparatus for injecting fuel of a calculated injection quantity by means of the injector to a corresponding cylinder.
In this case, however, there will take place an injection variation in the fuel injected by the injector, that is, a variation in the engine power with a difference in combustion in each cylinder of the engine itself, notwithstanding the same quantity of fuel injection calculated by the fuel injection control apparatus. In the related art fuel injection control apparatus, therefore, there is provided, by each cylinder, a variable control section, such as a rheostat, for adjusting the fuel injection quantity between cylinders for the purpose of correcting the engine output variation. Each variable control section is so adapted as to regulate the fuel injection quantity, at the time of calculation of the fuel injection quantity, by an amount corresponding to the amount of the operation effected at the variable control section when a user, a maintenance engineer for example, manipulates a controller on some variable control section during an engine idling operation.
In the related art fuel injection control apparatus, however, the variable control section is provided by each cylinder for the purpose of adjusting the fuel injection quantity between cylinders as previously stated. Therefore, the related art apparatus presents such a problem that the component count will increase and moreover it will become difficult to design an actual mounting layout.
SUMMARY AND OBJECTS OF THE INVENTION
An object of the present invention, therefore, is to provide a fuel injection control apparatus of a multicylinder internal combustion engine that is capable of adjusting the quantity of fuel to be injected between cylinders, from the fewest possible variable control sections.
The fuel injection control apparatus of the present invention is for controlling the quantity of fuel to be injected into a cylinder of a multicylinder internal combustion engine, which comprises a fuel injection quantity calculating means for calculating the quantity of fuel to be injected into each cylinder of the internal combustion engine in accordance with engine operation parameters. A cylinder designating means is provided for selectively designating any one of the multicylinders in accordance with output of a first variable control section. An adjustment quantity designating means is provided for generating fuel adjusting data which indicates the amount of adjustment of the fuel injection in accordance with the output of a second variable control section. A fuel injection quantity correcting means is operatively connected for correcting the quantity of fuel to be injected in accordance with the fuel adjusting data generated by the adjustment quantity designating means. The fuel injection quantity is corrected when the fuel injection quantity has been calculated by the fuel injection quantity calculating means for one cylinder designated by the cylinder designating means in a mode of fuel adjustment between cylinders. A means is provided for injecting fuel into one designated cylinder when the quantity of the fuel has been corrected by the injection quantity correcting means.
According to the fuel injection control apparatus of the multicylinder internal combustion engine of the present invention, the designated cylinder is changed in accordance with the operation of the first variable control section, and the amount of adjustment of fuel injection indicated by the adjusting data is also changed in accordance with the operation of the second variable control section. In the mode of fuel adjustment between cylinders, therefore, it is possible to set the amount of adjustment of the fuel injection into all cylinders simply by the two variable control sections. The two variable control sections correct the quantity of fuel injection corresponding to one cylinder designated at the time of the mode of the fuel adjustment between cylinders in accordance with the adjusting data. Consequently, the fuel injection quantity between cylinders can be adjusted by means of the least possible number of variable control sections.
Furthermore, the fuel injection control apparatus of a multicylinder internal combustion engine according to the present invention is characterized in that a means is further provided for storing in a memory adjusting data as a data map corresponding to one cylinder designated by the cylinder designating means at the time the adjusting data is gained. The data map is generated by the adjustment quantity designating means in the mode of fuel adjustment between cylinders. The injection quantity correcting means reads, from the data map, the adjusting data corresponding to each cylinder in an engine operation mode than the other of fuel adjustment between cylinders, thereby correcting the fuel injection quantity calculated by the fuel injection quantity calculating means in accordance with the adjusting data thus read.
According to the fuel injection control apparatus of the present invention thus constituted, the adjusting data obtained by each cylinder in the mode of fuel adjustment between cylinders can be stored by each cylinder as a data map. Therefore, the adjusting data gained in the mode of fuel adjustment between cylinders can be properly reflected in terms of the quantity of fuel injection into each cylinder in a subsequent engine operation mode.
Furthermore, the fuel injection control apparatus of the multicylinder internal combustion engine according to the present invention is characterized by the provision of an indicator which indicates one cylinder designated by the cylinder designating means in the mode of fuel adjustment between cylinders when an adjusting data corresponding to the designated one cylinder is given by the adjustment quantity designating means.
According to the fuel injection control apparatus of the present invention having the above-described constitution, the operator can see which cylinder is under adjustment and accordingly can easily perform the adjusting operation.
Further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. However, it should be understood that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description.
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patent: 5634448 (1997-06-01), Shinogle et al.
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patent: 5832901 (1998-11-01), Yoshida et al.
patent: 5836287 (1998-11-01), Yano et al.
patent: 6041757 (2000-03-01), Kdota
Hayashi Tatsuo
Hirakata Yoshiaki
Tanaka Hiroshi
Birch & Stewart Kolasch & Birch, LLP
Honda Giken Kogyo Kabushiki Kaisha
Kwon John
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