Patent EP1077320A2 successfully refreshed from Google Patents.
EP1077320A2
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EP
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Control for diesel engine
Assignee: Nissan Motor Co Ltd
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Filing: 2000-08-17
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Granted: —
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Expires: 2020-08-17
Abstract
Abstract A diesel engine is provided with a supercharger and an EGR system. A control unit determines a target EGR quantity in accordance with input information on one or more engine operating conditions, and achieves the target EGR quantity in the EGR system. The control unit further determines an intake control parameter representing a target intake air quantity or a boost pressure in accordance with the input information, and controls the boost pressure in accordance with the intake control parameter and the target EGR quantity.
Inventors
- 👤 Hiroyuki Itoyama
- 👤 Takashi Shirakawa
- 👤 Manabu Miura
- 👤 Hiromichi Miwa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 05:47
CPC Classifications
F; F02; F02M; F02M59/00; F02M59/20; F02M59/36; F02M59/366; F02B; F02B37/00; F02B37/12; F02B37/24; F02D; F02D21/00; F02D21/06; F02D21/08; F02D41/00; F02D41/0002; F02D41/0007; F02D41/0025; F02D41/0047; F02D41/005; F02D41/30; F02D41/38; F02D41/3809; F02D41/3827; F02M26/00; F02M26/52; F02M26/59; F02M26/60; F02M47/00; F02M47/02; F02M47/027; F02D41/02; F02D41/14; F02D41/1401; F02D2041/141; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0402; F02D2200/0406; F02D41/0065; F02D41/0072; F02D41/18; F02D41/187; F02M26/02; F02M26/04; F02M26/05; F02M26/09; F02M26/10; F02M26/13; F02M26/22; F02M26/23; F02M26/28; F02M26/55; F02M26/56; F02M26/57; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
195 words
A diesel engine comprising: an EGR passage connecting an exhaust passage with
an intake passage of the engine; an EGR quantity regulating means for regulating a
quantity of exhaust gas recirculated through the EGR
passage from the exhaust passage to the intake passage; a supercharger forcing additional air through the
intake passage into the engine; a boost pressure regulating means for regulating a
boost pressure produced by the supercharger; an operating condition sensing means for sensing an
engine operating condition of the engine; a first target parameter calculating means for
calculating a first target parameter correlated with the
quantity of the exhaust gas recirculated through the EGR
passage, on the basis of the engine operating condition; a second target parameter calculating means for
calculating a second target parameter correlated with a
quantity of intake air inducted into the engine through the
intake passage, on the basis of the engine operating
condition; a first controlling means for controlling the EGR
quantity regulating means on the basis of the first target
parameter; and a second controlling means for controlling the boost
pressure regulating means on the basis of the first target
parameter and the second target parameter.
Claim 2
Dependent Claim
32 words
The diesel engine of Claim 1, wherein the first target
parameter is a target EGR quantity representing a desired
value of the quantity of the exhaust gas recirculated
through the EGR passage.
Claim 3
Dependent Claim
43 words
The diesel engine of Claim 1, wherein the first target
parameter is a target EGR rate representing a desired ratio
between the quantity of the exhaust gas recirculated
through the EGR passage and the quantity of the intake air
inducted into the engine.
Claim 4
Dependent Claim
83 words
The diesel engine of one of Claims 1 to 3, wherein the
EGR quantity regulating means comprises an EGR flow
regulating valve disposed in the EGR passage, and the first
controlling means comprises a target valve opening area
calculating means for calculating a target valve opening
area of the EGR flow regulating valve on the basis of the
first target parameter, and an EGR valve controlling means
for controlling the EGR flow regulating valve on the basis of
the target valve opening area.
Claim 5
Dependent Claim
127 words
The diesel engine of Claim 4, wherein the first
controlling means further comprises an actual EGR quantity
calculating means for calculating an actual EGR quantity on
the basis of the first target parameter which is the target
EGR rate, an EGR flow velocity calculating means for
calculating an EGR flow velocity of the exhaust gas passing
through the EGR flow regulating valve on the basis of the
first target parameter and the actual EGR quantity, and a
target EGR quantity calculating means for calculating a
target EGR quantity on the basis of the first target
parameter; and the target valve opening area calculating
means includes a means for calculating the target valve
opening area on the basis of the target EGR quantity and
the EGR flow velocity.
Claim 6
Dependent Claim
30 words
The diesel engine of one of Claims 1∼5, wherein the
second target parameter is a target boost pressure
representing a desired value of the boost pressure
produced by the supercharger.
Claim 7
Dependent Claim
34 words
The diesel engine of one of Claims 1∼5, wherein the
second target parameter is a target intake air quantity
representing a desired value of the quantity of the intake
air inducted into the engine.
Claim 8
Dependent Claim
69 words
The diesel engine of Claim 7, wherein the operating
condition sensing means comprises an intake air quantity
sensing means for sensing the quantity of the intake air
inducted into the engine to determine an actual intake air
quantity, and the target EGR quantity calculating means
calculates the target EGR quantity on the basis of the first
target parameter, the actual intake air quantity (Qac) and
the second target parameter.
Claim 9
Dependent Claim
96 words
The diesel engine of Claim 8, wherein the target EGR
quantity calculating means comprises a required EGR
quantity calculating means for calculating a required EGR
quantity on the basis of the first target parameter, and a
feedback correction quantity calculating means for
calculating a feedback correction quantity in accordance
with a difference or a ratio between the actual intake air
quantity and the second target parameter which is the
target intake air quantity; and the target EGR quantity
calculating means calculates the target EGR quantity by
correcting the required EGR quantity with the feedback
correction quantity.
Claim 10
Dependent Claim
102 words
The diesel engine of Claim 8, wherein the EGR flow
velocity calculating means comprises a feedback correction
quantity calculating means for calculating a feedback
correction quantity on the basis of a difference or a ratio
between the actual intake air quantity and the second
target parameter which is the target intake air quantity,
and a modified EGR quantity calculating means for
calculating a modified EGR quantity by correcting the actual
EGR quantity with the feedback correction quantity; and
the EGR flow velocity calculating means calculates the EGR
flow velocity on the basis of the first target parameter and
the modified EGR quantity.
Claim 11
Dependent Claim
28 words
The diesel engine of one of Claims 1∼10, wherein the
second target parameter calculating means calculates the
second target parameter on the basis of the first target
parameter.
Claim 12
Dependent Claim
93 words
The diesel engine of one of Claims 1∼11, wherein the
supercharger is a turbocharger comprising an exhaust
turbine, the boost pressure regulating means comprises an
exhaust flow regulating means for regulating the flow of
the exhaust gas flowing into the exhaust turbine, the
second controlling means comprises a target manipulated
variable calculating means for calculating a target
manipulated variable on the basis of the first target
parameter and the second target parameter, and an
exhaust flow controlling means for controlling the exhaust
flow regulating means on the basis of the target
manipulated variable.
Claim 13
Dependent Claim
37 words
The diesel engine of Claim 12, wherein the target
manipulated variable calculating means calculates the
target manipulated variable on the basis of the actual EGR
quantity based on the first target parameter and the
second target parameter.
Claim 14
Dependent Claim
42 words
The diesel engine of Claim 12, wherein the target
manipulated variable calculating means calculates the
target manipulated variable on the basis of a delayed first
parameter obtained by performing a delay operation on the
first target parameter, and the second target parameter.
Claim 15
Dependent Claim
80 words
The diesel engine of Claim 12, wherein the target
manipulated variable calculating means comprises a base
manipulated variable calculating means for calculating a
base manipulated variable on the basis of the first target
parameter and the second target parameter, a correction
quantity calculating means for calculating a correction
quantity on the basis of an acceleration related parameter;
and the target manipulated variable calculating means
calculates the target manipulated variable by correcting the
base manipulated variable with the correction quantity
(kRvnt).
Claim 16
Dependent Claim
95 words
The diesel engine of Claim 12, wherein the target
manipulated variable calculating means comprises a first
variable calculating means for calculating a first variable on
the basis of the first target parameter and the second
target parameter, a second variable calculating means for
calculating a second variable on the basis of the first target
parameter and the second target parameter and the target
manipulated variable calculating means calculates the
target manipulated variable on the basis of the first
variable, the second variable, and a temperature related
parameter correlated with a warm-up condition of the
engine.
Claim 17
Dependent Claim
37 words
The diesel engine of Claim 12, wherein the target
manipulated variable calculating means calculates the
target manipulated variable on the basis of the first target
parameter, the second target parameter, an engine speed,
and an engine load.
Claim 18
Dependent Claim
58 words
The diesel engine of Claim 12, wherein the target
manipulated variable calculating means calculates the
target manipulated variable on the basis of a first delayed
variable obtained by performing a delay operation on the
first target parameter, a second delayed variable obtained
by a delay operation on the second target parameter, an
engine speed, and an engine load.
Claim 19
Dependent Claim
108 words
The diesel engine of one of Claims 1∼19, wherein the
diesel engine further comprises a fuel injection pressure
sensing means for sensing a fuel injection pressure, and
wherein the first target parameter calculating means
comprises a first means for calculating a base parameter on
the basis of the operating condition, a second means for
calculating a target pressure, and a third means for
calculating a pressure correction quantity on the basis of a
difference or a ratio between the fuel injection pressure
and the target pressure; and the first target parameter
calculating means calculates the first target parameter by
modifying the base parameter with the pressure correction
quantity.
Claim 20
Dependent Claim
119 words
A control process for controlling an EGR quantity and
a boost pressure in a diesel engine having an EGR system
and a supercharging system, comprising: a first target parameter calculating step of calculating
an EGR control parameter on the basis of a sensed engine
operating condition; a second target parameter calculating step of
calculating an intake control parameter representing one of
a target intake air quantity and a target boost pressure on
the basis of the engine operating condition; a first controlling step of controlling the EGR quantity
on the basis of the EGR control parameter; and a second controlling step of controlling the boost
pressure on the basis of the EGR control parameter and the
intake control parameter.
References Cited (Backward Citations)
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