Internal-combustion engines – Charge forming device – Fuel injection system
Reexamination Certificate
1999-06-02
2001-12-11
Dolinar, Andrew M. (Department: 3747)
Internal-combustion engines
Charge forming device
Fuel injection system
C123S492000
Reexamination Certificate
active
06328018
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a control apparatus for controlling an internal combustion engine that controls a fuel injector of the internal combustion engine.
2. Background Art
An apparatus disclosed in Japanese Patent Kokai No. 8-135491 is known as a controller which controls the amount of fuel injection to an automobile internal combustion engine based on the opening level of a throttle valve mounted to an intake system. The controller detects the opening level &thgr;
TH
of a throttle valve at each engine cycle and retrieves a fuel increment correction coefficient from a map in accordance with &Dgr;&thgr;
TH
=
TH
(current value)−&thgr;
TH
(previous value) which is the difference between &thgr;
TH
(previous value) detected previously and &thgr;
TH
(current value) detected currently. Then, the amount of fuel injection is determined by multiplying this fuel increment correction coefficient to a reference amount of fuel injection that is determined from the number of revolutions of an internal combustion engine and the intake manifold pressure.
OBJECTS AND SUMMARY OF THE INVENTION
A control apparatus mentioned above corrects and determines the reference amount of fuel injection only in accordance with the variation in the opening level of the throttle valve &Dgr;&thgr;
TH
irrespective of the current value of the opening level of the throttle valve. On the other hand, different amounts of fuel injection are required when an accelerating operation is started at a small throttle valve opening level, for example, when an automobile is accelerated from a standstill status or decelerating status, or when the accelerating operation is started at a large throttle valve opening level, for example, when an automobile is accelerated from an ordinary running status. However, in these cases, there was a problem in that the conventional control apparatus provided the same fuel increment correction coefficient by calculation if &Dgr;&thgr;
TH
was the same value.
In view of the foregoing, the object of the present invention is to provide a control apparatus for controlling an internal combustion engine that enables preferable acceleration in response to the running status of the internal combustion engine.
The control apparatus for controlling an internal combustion engine by the present invention comprises computing means for computing the fuel supply of the internal combustion engine at each engine cycle based on engine parameters of the internal combustion engine and control means for controlling a fuel injector to supply fuel to the engine according to the amount of fuel supply computed, which is characterized in that the computing means includes first means for generating a first signal when the first means detects a change in the throttle opening level of the internal combustion engine from a low opening level which is lower than a predetermined opening level to a non-low opening level which is higher than said predetermined level, second means for generating a second signal when the second means detects that a variation &Dgr;&thgr;
TH
in the throttle opening level is equal to or greater than the predetermined value, third means for generating an increment correction value differently when said first detection signal is generated and when said second detection signal is generated respectively, and fourth means f or correcting the amount of fuel supply according to said increment correction values.
According to an aspect of the present invention, the control apparatus for controlling an internal combustion engine allows the e engine e to be desirably accelerated in response to the running conditions of the engine because the increment correction values are generated differently when first and second detection signals are generated.
Additionally, according to another aspect of the present invention, the low opening level being in the totally closed status provides preferable acceleration even when the throttle valve is opened from the totally closed status.
Furthermore, according to another aspect of the present invention, an increment correction value is generated in response to the number of fuel injections counted from the time of generation of the first detection signal. Therefore, preferable acceleration is provided in the case of opening the throttle valve from the low opening level to a non-low level opening.
Still furthermore, according to still another aspect of the present invention, an increment t correction value is generated in response to variation &Dgr;&thgr;
TH
when the second detection signal is generated. Therefore, preferable acceleration is provided even when the throttle valve is opened from an opening level except for the low opening level.
REFERENCES:
patent: 4469073 (1984-09-01), Kobayashi et al.
patent: 4706632 (1987-11-01), Kasanami et al.
patent: 4781163 (1988-11-01), Jautelat et al.
patent: 4805579 (1989-02-01), Toshimitsu et al.
patent: 0 196 227 A2 (1986-10-01), None
Abstract of Japanese Patent Publication No. 60252141, by Honda Motor Co., Ltd., dated May 30, 1984.
Abstract of Japanese Patent Publication No. 05059994, by Nippondenso Co., Ltd., dated Aug. 28, 1991.
Abe Masahiko
Akasaka Miyoko
Hirakata Yoshiaki
Iwata Yasuo
Arent Fox Kintner & Plotkin & Kahn, PLLC
Dolinar Andrew M.
Keihin Corporation
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