Internal combustion engine controller

Details Internal combustion engine controller Internal combustion engine controller

1999-06-02

2001-04-24

Dolinar, Andrew M. (Department: 3747)

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

C123S406650, C123S486000

Reexamination Certificate

active

06223119

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a controller of an internal combustion engine that controls the quantity of fuel supply or ignition timing of the internal combustion engine.
2. Background Art
For controlling the quantity of fuel supply and ignition timing of an internal combustion engine, the quantity of fuel supply and ignition timing are determined by performing algorithmic calculations at each cycle of the engine with respect to engine parameters such as the engine speed, the intake manifold vacuum, and the engine temperature. A prior art technique for such a control is described in Japanese Patent Kokai Publication No. 61-277845.
Such algorithmic calculation is performed at a predetermined crank angle position where the engine parameters are rather stable. Moreover, the calculation results obtained at one engine cycle are used for controlling the quantity of the fuel supply and the ignition timing within the subsequent cycle.
Such prior art controller for the internal combustion engine allows algorithmic calculations to be performed on the basis of the engine parameters at the predetermined or given crank angle position. Consequently, this creates a problem since it takes a long time for the engine to stabilize in the operational condition because of the occurrence of a hunting phenomena caused by fluctuations in the operational condition of the engine. It was, furthermore, revealed that the engine control based on the engine parameters detected at a fixed crank angle position does not always allow desired operational conditions in case of a multi-cylinder engine.
OBJECTS AND SUMMARY OF THE INVENTION
The object of the present invention is to provide a controller of an internal combustion engine that allows optimum algorithmic calculations under various conditions of the internal combustion engine.
The controller of an internal combustion engine, according to the present invention, is a device that performs either control of the quantity of fuel supply or control of the ignition timing for the internal combustion engine on the basis of engine parameters detected from the internal combustion engine. The controller comprises;
a crank angle sensor for generating timing pulses at every predetermined angular position of the crank shaft of the internal combustion engine;
a stage counter for obtaining a current value of a stage count while updating the stage count value in response to said timing pulses;
execution stage determination means for determining an execution stage number at which said control should be executed in accordance with said engine parameters; and
control execution command means for obtaining a control value corresponding to the current values of the engine parameters at a timing when said current value of the stage count coincides with the determined execution stage number, and then commanding execution of said control which is based on the obtained control value.
According to another aspect of the present invention, said internal combustion engine is a multiple cylinder engine and said execution stage determination means determines said execution stage for each cylinder.
According to another aspect of the present invention, said execution stage determination means is adapted to select the execution stage numbers corresponding to coordinate points that are distributed in a two-dimensional map having at least two parameters of said engine parameters.
According to another aspect of the present invention, said execution stage determination means sets the current value of said coordinate point to a value that does not differ greatly from the previous value.
According to still another aspect of the present invention, said execution stage determination means determines a stage number in response to said engine parameters only when said internal combustion engine has an engine speed equal to or greater than a predetermined engine speed.
The controller of an internal combustion engine according to the present invention allows fuel injection and ignition control to be performed at an optimum timing under the operational conditions of the internal engine.
According to one aspect of the present invention, fuel injection and ignition control are executed at optimum timings for each cylinder in a multiple cylinder internal combustion engine.
According to another aspect of the present invention, the running stability of the engine is never adversely affected because the timing of fuel injection control and ignition control are not suddenly changed.
According to still another aspect of the present invention, correct control is performed because the operation of fuel injection control and ignition control are carried out in accordance with engine parameters only when the internal combustion engine has an engine speed greater than a predetermined engine speed.


REFERENCES:
patent: 4617899 (1986-10-01), Nakajima
patent: 4638780 (1987-01-01), Trinh et al.
patent: 5319558 (1994-06-01), Nemoto et al.
patent: 5386810 (1995-02-01), Gronenberg et al.
patent: 5546909 (1996-08-01), Messih et al.
patent: 5752488 (1998-05-01), Hattori et al.
patent: 0 261 473 A1 (1988-03-01), None
patent: 0 691 463 A2 (1996-01-01), None

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