Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Reexamination Certificate
1998-12-28
2001-02-06
Argenbright, Tony M. (Department: 3747)
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
C123S679000
Reexamination Certificate
active
06182647
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to a fuel injection control apparatus of an internal combustion engine and a fuel injection method of an internal combustion engine.
Up to now, by carrying out a fuel control in which a desirable injection characteristic of a fuel injector can be obtained, a fuel injection control apparatus having a wide range linear characteristic area has been proposed. For example, Japanese patent application laid-open No. Hei 9-209803 discloses, in a fuel injection control apparatus constituted by including an operation condition detection means for defecting an engine operation condition, a fuel injection amount establishment means for establishing a fuel injection mount to the engine according to the detected engine operation condition, and a fuel injection control means for carrying out a fuel injection control according to the established fuel injection amount through a fuel injector. A fuel injection control apparatus for use in an internal combustion engine is characterized in that the fuel control apparatus is constituted including a correction amount establishment means for establishing a correction amount to have a desirable injection characteristic of the fuel injection amount from the fuel injector, and a fuel injection amount correction means for correcting the fuel injection mount is established by the fuel injection amount establishment means according to the established correction amount.
The above stated desirable injection characteristic is a relationship between a drive signal to the fuel injector and the fuel injection amount having the linear characteristic in which a substantially constant inclination extending over at substantially whole area.
In an engine such a lean burn engine and a cylinder-in injection gasoline engine, at a small area of the fuel injection amount, an actual fuel injection amount against a control value becomes small, namely there happens that a direction of a fuel pulse width disagrees with a direction of an increase area of the fuel amount. With the above stated reasons, an unstable use area exists in the small area of the fuel injection amount, there is a concern about inviting aggravation of the operability and the exhaust gas property. With these reasons, in the conventional example stated above, it has been proposed that the correction amount is determined to obtain that the relationship between the drive signal to the fuel injector and the fuel injection amount has the linear characteristic having a substantially constant inclination extending substantially over the whole area.
However, when the above stated linear characteristic control is carried out or not carried out, in the area where the fuel injection amount becomes further small, it is impossible to carry out the correspondence between the fuel injection amount and the fuel injection pulse width. This area is positioned as the use impossible area and the pulse width limitation is carried out.
SUMMARY OF THE INVENTION
An object according to the present invention to provide a fuel injection control apparatus and a fuel injection method wherein when the above stated pulse width limitation control is carried out, the fuel injection control can be carried out suitably, and by excepting the factors for giving the affects to the pulse width control limitation, and when it moves to other operation conditions, the operability is not damaged according to the excess operational conditions such as an over lean condition.
According to the present invention, the control where the fuel pulse width limitation is carried out, an air-fuel ratio feedback correction used in the execution of fuel pulse width or A/F (air-fuel ratio) learning correction are carried out, namely it has a characteristic when the limitation is carried out. As the means for limitation, it can employ an open control. As the fuel width limitation, there are a fuel width lower limitation and a fuel width upper limitation, however in the present invention, it is effective when the fuel width lower limitation is employed.
Herein, the concept about the air-fuel ratio feedback includes O
2
feedback.
More concretely, the present invention will provide following apparatuses and methods.
In a fuel injection control apparatus having an operation condition detection means for detecting an engine operation condition, a fuel injection amount establishment means for establishing a fuel injection amount to an engine according to said detected engine operation condition, and an air-fuel ratio feedback correction means for correcting said fuel injection pulse width according to an air-fuel ratio feedback correction, the fuel injection control apparatus further includes a pulse width lower limitation establishment means for establishing a pulse width lower limitation value, and a control means for carrying out a control which limits a pulse width correction alternation command according to said air-fuel ratio feedback correction means, as to said fuel injection pulse width which is affected to a correction according to said air-fuel ratio feedback correction, when said pulse width lower limitation value control is carried out.
In a fuel injection control apparatus having an operation condition detection means for detecting an engine operation condition which includes a control means to open control an air-fuel ratio feedback correction means, a fuel injection amount establishment means for establishing a fuel injection amount to an engine according to said detected engine operation condition, and an air-fuel ratio feedback correction means for correcting said fuel injection pulse width according to an air-fuel ratio feedback correction, the fuel injection control apparatus further includes a pulse width limitation establishment means for establishing a pulse width limitation value, and a control means for carrying out a control which limits a pulse width correction alternation command according to said air-fuel ratio feedback correction means, under a condition in which said pulse width limitation is carried out.
In a fuel injection control apparatus having an operation condition detection means for detecting an engine operation condition, a fuel injection amount establishment means for establishing a fuel injection amount to an engine according to said detected engine operation condition, an air-fuel ratio feedback correction means for correcting said fuel injection pulse width according to an air-fuel feedback ratio correction, and an A/F (air-fuel) learning correction means for A/F learning correcting said fuel injection width according to the A/F leaning, the fuel injection control apparatus further includes a pulse width lower limitation establishment means for establishing a pulse width lower limitation value, and a correction width limitation means for limiting the correction, when a calculated fuel injection pulse width according to said air-fuel ratio feedback correction and said A/F learning correction exceeds over said pulse width lower limitation value.
In a fuel injection control apparatus having an operation condition detection means for detecting an engine operation condition, a fuel injection amount establishment means for establishing a fuel injection amount to an engine according to said detected engine operation condition, an injection pulse width establishment means for establishing a fuel injection width according to said established fuel injection amount, and an A/F (an air-fuel ratio) learning correction means for A/F learning correcting said fuel injection pulse width according to an A/F learning, the fuel injection control apparatus further includes a pulse width limitation establishment means for establishing a pulse width limitation value, and means for limiting a renewal of the A/F learning, when said fuel injection width affected and calculated according to said correction of said A/F learning correction means exceeds over said pulse width lower limitation value.
In a fuel injection method for detecting an engine operation condition, for establishing a fuel
Atago Takeshi
Hori Toshio
Argenbright Tony M.
Evenson, McKeown, Edwards & Lenahan P.L.L.C.
Hitachi , Ltd.
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