EP0848156A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Fuel vapor feed controlling apparatus for a lean burn type internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1997-12-15
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Granted: —
•
Expires: 2017-12-15
Abstract
Abstract A fuel vapor feed controlling apparatus is provided for a lean burn internal combustion engine for suppressing a rich misfire or a surge when the fuel vapor is fed into the lean burn internal combustion engine. A purge controlling unit controls a fuel vapor amount to be fed from a fuel reservoir to the internal combustion engine in response to an operational condition of the internal combustion engine. A first compensation unit compensates for the fuel vapor amount so that an engine revolution speed of the internal combustion engine may be identical with a target revolution speed. The purge control unit performs a purge control on the basis of a compensation value compensated by the first compensation unit. An air/fuel ratio judging unit judges a shift from an air/fuel ratio corresponding to a lean burn to an air/fuel ratio that is richer than the former air/fuel ratio in the lean burn operation. A fuel restricting unit restricts at least a purge amount out of the purge amount of fuel vapor determined by the purge control unit and a fuel amount to be injected from a fuel injection valve of the internal combustion engine when the air/fuel ratio judging unit judges that the air/fuel ratio is to be enriched. A fuel vapor compensation unit compensates the fuel vapor on the basis of the operational condition of the internal combustion engine. An injection amount changing unit changes the fuel injection amount to the internal combustion engine on the basis of the compensated fuel vapor amount. A correction controlling unit increases and decreases the fuel vapor amount in response to the operational condition after the injection amount change and controls a fuel injection timing on an advance side or on a retard side.
Inventors
- 👤 Naoya Takagi
- 👤 Toshimi Murai
- 👤 Yoshihiko Hyodo
- 👤 Zenichiro Mashiki
- 👤 Tetsuji Nagata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 11:52
CPC Classifications
F; F02; F02M; F02M25/00; F02M25/08; F02D; F02D41/00; F02D41/0025; F02D41/003; F02D41/0032; F02D41/30; F02D41/3011; F02D41/3017; F02D41/3023; F02D41/3029; F02D41/3064; F02D41/0002; F02D2041/0015; F02D41/38; F02D2041/389; F02D2250/00; F02D2250/18
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
130 words
A fuel vapor feed controlling apparatus for a lean
burn internal combustion engine comprising: a purge passage for purging fuel vapor, generated from a
fuel storing means for storing fuel of the internal combustion
engine, to an intake system of the internal combustion engine; a purge controlling means for controlling a fuel vapor
amount, to be introduced from said purge passage to said intake
system, in response to an operational condition of said internal
combustion engine; and a first compensation means for compensating for the fuel
vapor amount so that an engine revolution speed of said internal
combustion engine may be identical with a target revolution
speed, wherein said purge controlling means performs a purge
control on the basis of a compensation value compensated for by
said first compensation means.
Claim 2
Dependent Claim
34 words
The fuel vapor feed controlling apparatus according to
claim 1, wherein the target revolution speed of the internal
combustion engine to be referred to by said first compensation
means is an idle revolution speed.
Claim 3
Dependent Claim
46 words
The fuel vapor feed controlling apparatus according to
claim 2, further comprising a fuel feed amount controlling means
for adjusting a feed amount of the fuel in response to the
compensation result by said first compensation means in the idle
operation of a lean burn condition.
Claim 4
Dependent Claim
123 words
A fuel vapor feed controlling apparatus for a lean
burn internal combustion engine comprising: a purge passage for purging fuel vapor, generated from a
fuel storing means for storing fuel of the internal combustion
engine, to an intake system of the internal combustion engine; a purge controlling means for controlling a fuel vapor
amount, to be introduced from said purge passage to said intake
system, in response to an operational condition of said internal
combustion engine; and a second compensation means for compensating for the fuel
vapor amount in response to an engine revolution speed of said
internal combustion engine, wherein said purge controlling means performs a purge
control on the basis of a compensation value compensated for by
said second compensation means.
Claim 5
Dependent Claim
122 words
A fuel vapor feed controlling apparatus for a lean
burn internal combustion engine comprising: a purge passage for purging fuel vapor, generated from a
fuel storing means for storing fuel of the internal combustion
engine, to an intake system of the internal combustion engine; a purge controlling means for controlling a fuel vapor
amount, to be introduced from said purge passage to said intake
system, in response to an operational condition of said internal
combustion engine; and a third compensation means for compensating for the fuel
vapor amount in response to an output variation of said internal
combustion engine, wherein said purge controlling means performs a purge
control on the basis of a compensation value compensated for by
said third compensation means.
Claim 6
Dependent Claim
37 words
The fuel vapor feed controlling apparatus according to
claim 5, further comprising a fuel feed amount controlling means
for adjusting a feed amount of the fuel in response to the output
variation of the internal combustion engine.
Claim 7
Dependent Claim
122 words
A fuel vapor feed controlling apparatus for a lean
burn internal combustion engine comprising: a purge passage for purging fuel vapor, generated from a
fuel storing means for storing fuel of the internal combustion
engine, to an intake system of the internal combustion engine; a purge controlling means for controlling a fuel vapor
amount, to be introduced from said purge passage to said intake
system, in response to an operational condition of said internal
combustion engine; and a fourth compensation means for compensating for the fuel
vapor amount in response to a combustion condition of said
internal combustion engine, wherein said purge controlling means performs a purge
control on the basis of a compensation value compensated for by
said fourth compensation means.
Claim 8
Dependent Claim
38 words
The fuel vapor feed controlling apparatus according to
any one of claims 1 to 7, further comprising an injection
condition changing means for changing a fuel injection condition
in response to the compensation of the fuel vapor amount.
Claim 9
Dependent Claim
58 words
The fuel vapor feed controlling apparatus according to
any one of claims 1 to 8, further comprising a concentration
detecting means for detecting a concentration of the fuel vapor
and a fifth compensation means for compensating for an opening
degree of a purge valve or a fuel injection condition in response
to the concentration of the fuel vapor.
Claim 10
Dependent Claim
44 words
The fuel vapor feed controlling apparatus according
to claim 7, further comprising a control delay means for delaying
a time to start a change of an opening degree of a purge valve
or a change of a fuel injection condition in switching combustion
conditions.
Claim 11
Dependent Claim
42 words
The fuel vapor feed controlling apparatus according
to claim 7, further comprising a change speed controlling means
for controlling an opening degree changing speed of a purge
control valve or a fuel injection condition changing speed in
response to the combustion condition.
Claim 12
Dependent Claim
25 words
The fuel vapor feed controlling apparatus according
to claim 11, wherein said fuel injection condition changing speed
is varied in every combustion condition switching operation.
Claim 13
Dependent Claim
44 words
The fuel vapor feed controlling apparatus according
to claim 8 or 9, wherein said injection condition changing means
changes the injection amount compensation amount as a fuel
injection condition, and a change of the injection amount
compensation amount is restricted by a guard value.
Claim 14
Dependent Claim
45 words
The fuel vapor feed controlling apparatus according
to claim 7, further comprising a fuel feed amount controlling
means for adjusting a feed amount of the fuel in response to a
switching mode in a switching operation of the combustion
condition of the internal combustion engine.
Claim 15
Dependent Claim
170 words
A fuel vapor feed controlling apparatus for a lean
burn internal combustion engine comprising: a purge passage for purging fuel vapor, generated from a
fuel storing means for storing fuel of the internal combustion
engine, to an intake system of the internal combustion engine; a purge controlling means for controlling a fuel vapor
amount, to be introduced from said purge passage to said intake
system, in response to an operational condition of said internal
combustion engine; an air/fuel ratio judging means for judging a shift from
an air/fuel ratio corresponding to a lean burn to an air/fuel
ratio that is richer than the former air/fuel ratio in the lean
burn operation; and a fuel restricting means for restricting at least a purge
amount out of the purge amount of the fuel vapor determined by
said purge control means and a fuel amount to be injected from
a fuel injection valve of the internal combustion engine when the
air/fuel ratio judging means judges that the air/fuel ratio is
to be enriched.
Claim 16
Dependent Claim
97 words
The fuel vapor feed controlling apparatus according
to claim 15, further comprising a rich spike controlling means
for release and purifying nitrogen oxide absorbed in a nitrogen
oxide reducer catalyst provided in an exhaust passage of said
internal combustion engine by temporarily enriching the air/fuel
ratio of the combustible mixture at least in the case where the
lean burn operation is performed, wherein said air/fuel ratio judging means judges that the
air/fuel ratio is kept in an enriched condition when an amount
of the nitrogen oxide absorbed in the nitrogen oxide reducer
catalyst exceeds a predetermined amount.
Claim 17
Dependent Claim
78 words
The fuel vapor feed controlling apparatus according
to claim 15, further comprising a brake booster for assisting a
brake operation of a vehicle on the basis of a vacuum pressure
within said intake passage, and a vacuum pressure producing means
for producing the vacuum pressure for said brake by throttling
an air flow rate through said intake passage, wherein said air/fuel ratio judging means makes a
judgement in accordance with the operational condition of said
vacuum producing means.
Claim 18
Dependent Claim
51 words
The fuel vapor feed controlling apparatus according
to claim 15 or 17, further comprising a vacuum amount detecting
means for detecting a vacuum amount within said brake booster, wherein said air/fuel ratio judging means judges the
air/fuel ratio in accordance with the vacuum pressure detected
by said vacuum amount detecting means.
Claim 19
Dependent Claim
45 words
The fuel vapor feed controlling apparatus according
to claim 15, further comprising an intake density detecting means
for detecting an intake density, wherein said air/fuel ratio judging means judges the
air/fuel ratio in accordance with the intake density detected by
said intake density detecting means.
Claim 20
Dependent Claim
55 words
The fuel vapor feed controlling apparatus according
to any one of claims 15 to 19, further comprising an injection
condition changing means for changing the fuel injection
condition together with the restriction of the purge amount by
said fuel restricting means when said air/fuel judgement means
judges that the air/fuel ratio is to be enriched.
Claim 21
Dependent Claim
51 words
The fuel vapor feed controlling apparatus according
to any one of claim 15 or 20, further comprising a concentration
detecting means for detecting a fuel vapor concentration and a
compensation means for compensating for the fuel injection
condition or the purge amount in response to the concentration
of the fuel vapor.
Claim 22
Dependent Claim
164 words
A fuel vapor feed controlling apparatus for a lean
burn internal combustion engine comprising: a purge passage for purging fuel vapor, generated from a
fuel storing means for storing fuel of the internal combustion
engine, to an intake system of the internal combustion engine; a purge controlling means for controlling a fuel vapor
amount, to be introduced from said purge passage to said intake
system, in response to an operational condition of said internal
combustion engine; a fuel vapor compensation means for compensating for the
fuel vapor amount in response to an operation condition of said
internal combustion engine; an injection amount changing means for changing the fuel
injection amount to the internal combustion engine on the basis
of the compensated fuel vapor amount; and a correction controlling means for increasing and
decreasing the fuel vapor amount in response to the operational
condition after the injection amount change and for controlling
a fuel injection timing on an advance side or on a retard side.
Claim 23
Dependent Claim
41 words
The fuel vapor feed controlling apparatus according
to claim 22, wherein said correction controlling means decreases
the fuel vapor amount and controls the fuel injection timing on
the advance side when the operational condition after the
injection amount change is unstable.
Claim 24
Dependent Claim
41 words
The fuel vapor feed controlling apparatus according
to claim 22, wherein said correction controlling means increases
the fuel vapor amount and controls the fuel injection timing on
the retard side when the operational condition after the
injection amount change is stable.
Claim 25
Dependent Claim
68 words
The fuel vapor feed controlling apparatus according
to claim 22, further comprising: a reference value setting means for setting a stability
judgment standard of the operational condition in response to the
engine revolution speed; and a stability judgement means for judging the stability of
the internal combustion engine in accordance with a change width
on the basis of the reference value set by said reference value
setting means.
Claim 26
Dependent Claim
71 words
The fuel vapor feed controlling apparatus according
to claim 22 or 23, wherein said operational condition includes
a change rate ΔDLN of the torque variation of the internal
combustion engine and a torque variation change ΔTDLN of the
internal combustion engine, further comprising a compensation
means for compensating for at least one of the fuel vapor amount
and the fuel injection amount from the torque variation and the
torque variation change.
References Cited (Backward Citations)
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