Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
202 words
A fuel injection control system for a diesel engine
which has a fuel injector (5) for directly spraying fuel into a
combustion chamber (4) in a cylinder (2) of the engine (1), the
fuel injector (5) being controlled to spray the fuel at least at
a point of time near top dead center of a compression stroke of
the cylinder (2), comprising: a split injection controller (35a) for splitting a primary
injection of the fuel by the fuel injector (5) near top dead
center of the compression stroke of the cylinder (2) into a
plurality of split injections, one split injection being
followed by the next split injection after an injection
intermission interval which is a period lasting until the fuel
injector (5) is opened next following closing thereof; a judger (35b) for judging that a completion timing of the
final split injection of the primary injection is later than a
point of time corresponding to a specified crank angle; and a corrector (35c) for correcting a mode of the fuel
injection by the split injection controller (35a) when the
judger (35b) judges that the primary injection completion timing
is later than the point of time corresponding to the specified
crank angle.
Claim 2
Dependent Claim
53 words
The fuel injection control system according to claim
1, wherein the corrector (35c) corrects the mode of the fuel
injection by correcting at least one of the number of split
injections performed as the primary injection, the injection
intermission interval and a fuel injection pressure so as to
advance the injection completion timing.
Claim 3
Dependent Claim
36 words
The fuel injection control system according to claim
1, wherein the judger (35b) judges the injection completion
timing based on an amount of fuel to be sprayed during the
primary injection and an engine rotation speed.
Claim 4
Dependent Claim
58 words
The fuel injection control system according to claim
3, further comprising a pressurized chamber (6) for storing the
fuel in a state of a high pressure equal to or exceeding the
fuel injection pressure, wherein the judger (35b) makes a
judgment on the injection completion timing based on a pressure
of the fuel in the pressurized chamber (6).
Claim 5
Dependent Claim
52 words
The fuel injection control system according to claim
1, wherein the specified crank angle for judging the injection
completion timing is such a most retarded crank angle that the
fuel sprayed up to a point of time corresponding to the crank
angle can continue to be burnt with the previously sprayed fuel.
Claim 6
Dependent Claim
56 words
The fuel injection control system according to claim
1, wherein the judger (35b) judges that the completion timing of
the primary injection is later than the point of time
corresponding to the specified crank angle when the engine (1)
is in an accelerative operating condition and a rate of
acceleration is larger than a predetermined value.
Claim 7
Dependent Claim
63 words
The fuel injection control system according to claim
6, further comprising a turbosupercharger (25) for supercharging
an intake air by an exhaust gas of the engine (1), wherein the
split injection controller (35a) splits the primary injection
into a larger number of split injections when the engine (1) is
in the accelerative operating condition than when it is in a
usual operating condition.
Claim 8
Dependent Claim
74 words
The fuel injection control system according to claim
1, wherein the corrector (35c) corrects the mode of the fuel
injection by reducing an amount of fuel to be sprayed during the
primary injection, and wherein an auxiliary injection controller
(35d) is provided for causing the fuel injector (5) to perform
an auxiliary injection of the fuel in response to the correction
of the corrector (35c) to reduce the amount of fuel to be
sprayed.
Claim 9
Dependent Claim
36 words
The fuel injection control system according to claim
8, wherein the split injection controller (35a) controllably
splits the primary injection into split injections even if the
fuel is auxiliarily sprayed by the auxiliary injection
controller (35d).
Claim 10
Dependent Claim
63 words
The fuel injection control system according to claim
8, further comprising a turbosupercharger (25) for supercharging
an intake air by an exhaust gas of the engine (1), wherein the
split injection controller (35a) splits the primary injection
into a larger number of split injections when the engine (1) is
in an accelerative operating condition than when it is in a
usual operating condition.