EP0943790A2
Expired / Lapsed
EP
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Compression ignition type engine
Assignee: Toyota Motor Corp
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Filing: 1999-02-24
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Granted: —
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Expires: 2019-02-24
Abstract
Abstract A compression ignition type engine, wherein a first combustion where the amount of the recirculated exhaust gas supplied to the combustion chamber is larger than the amount of recirculated exhaust gas where the amount of production of soot peaks and almost no soot is produced and a second combustion where the amount of recirculated exhaust gas supplied to the combustion chamber is smaller than the amount of recirculated exhaust gas where the amount of production of soot peaks are selectively switched between. When NOx should be released from an NOx absorbent arranged in an exhaust passage of the engine, the second combustion switched to the first combustion and the amount of reduction of the output torque of the engine is compensated for by the output torque of an electric motor.
Inventors
- 👤 Hiroki c/o Toyota Jidosha Kabushiki Kaisha Murata
- 👤 Shizuo c/o Toyota Jidosha Kabushiki Kaisha Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 22:32
CPC Classifications
B; B60; B60K; B60K6/00; B60K6/20; B60K6/22; B60K6/24; B60W; B60W20/00; B60W20/10; B60W20/15; B60K6/42; B60K6/48; B60K6/485; B60W10/00; B60W10/04; B60W10/06; B60W10/08; F; F01; F01N; F01N3/00; F01N3/08; F01N3/0807; F01N3/0828; F01N3/0842; F02; F02B; F02B63/00; F02B63/04; F02D; F02D21/00; F02D21/06; F02D21/08; F02D29/00; F02D29/06; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0057; F02D41/02; F02D41/021; F02D41/0235; F02D41/027; F02D41/0275; F02D41/30; F02D41/3011; F02D41/3076; B60W2710/00; B60W2710/06; B60W2710/0616; B60W2710/0622; B60W2710/0644; B60W2710/065; F02B3/00; F02B3/06; F02D2250/00; F02D2250/18; F02D2250/24; F02M; F02M26/00; F02M26/02; F02M26/04; F02M26/05; F02M26/13; F02M26/22; F02M26/23; F02M26/28; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40; Y02T10/60; Y02T10/62; Y10; Y10S; Y10S903/00; Y10S903/902; Y10S903/903; Y10S903/904; Y10S903/905
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
291 words
A compression ignition type engine in which an
amount of production of soot gradually increases and then
peaks when an amount of inert gas in a combustion chamber
increases and in which a further increase of the amount
of inert gas in the combustion chamber results in a
temperature of fuel and surrounding gas at the time of
combustion in the combustion chamber becoming lower than
a temperature of production of soot and therefore almost
no production of soot any longer, said engine comprising: switching means for selectively switching
between a first combustion where the amount of the inert
gas in the combustion chamber is larger than the amount
of inert gas where the amount of production of soot peaks
and almost no soot is produced and a second combustion
where the amount of inert gas in the combustion chamber
is smaller than the amount of inert gas where the amount
of production of soot peaks; an NOx absorbent disposed in an exhaust
passage of the engine and absorbing NOx when an air-fuel
ratio of an exhaust gas flowing into the NOx absorbent is
lean, said NOx absorbent releasing an absorbed NOx when
the air-fuel ratio of the exhaust gas flowing into the
NOx absorbent is rich or the stoichiometric air-fuel
ratio; and drive power generating means for
generating drive power separately from a drive power of
the engine, wherein, when NOx should be released from the
NOx absorbent when the second combustion is being
performed, the second combustion is switched to the first
combustion and the air-fuel ratio in the combustion
chamber is made rich or the stoichiometric air-fuel ratio
by reducing an amount of fuel supplied to the engine and
the drive power generating means generates the drive
power.
Claim 2
Dependent Claim
23 words
A compression ignition type engine as set forth
in claim 1, wherein said drive power generating means is
comprised of an electric motor.
Claim 3
Dependent Claim
61 words
A compression ignition type engine as set forth
in claim 1, wherein said drive power generating means
generates an output torque substantially equal to an
amount of reduction of an output torque of the engine due
to a reduction in the amount of fuel supplied when
switching from the second combustion to first combustion
for releasing NOx from the NOx absorbent.
Claim 4
Dependent Claim
86 words
A compression ignition type engine as set forth
in claim 3, wherein an output torque of the engine
determined from an operating state of the engine is
stored in advance, and said drive power generating means
calculates an amount of reduction of the output torque of
the engine from the stored output torque of the engine
and generates an output torque substantially equal to the
calculated amount of reduction of the output torque of
the engine when switching from the second combustion to
the first combustion.
Claim 5
Dependent Claim
58 words
A compression ignition type engine as set forth
in claim 1, wherein the amount of fuel supplied is
reduced to the amount of fuel supply required for idling
operation under a rich air-fuel ratio or the
stoichiometric air-fuel ratio when switching from the
second combustion to the first combustion for release of
the NOx from the NOx absorbent.
Claim 6
Dependent Claim
43 words
A compression ignition type engine as set forth
in claim 1, wherein when the first combustion is being
performed and NOx should be released from the NOx
absorbent, the air-fuel ratio in the combustion chamber
is made rich or the stoichiometric air-fuel ratio.
Claim 7
Dependent Claim
55 words
A compression ignition type engine as set forth
in claim 1, wherein estimating means for estimating an
amount of NOx absorbed in the NOx absorbent is provided,
and it is judged that NOx should be released from the NOx
absorbent when the amount of NOx estimated by the
estimating means exceeds a predetermined NOx amount.
Claim 8
Dependent Claim
48 words
A compression ignition type engine as set forth
in claim 1, wherein an exhaust gas recirculation device
is provided for causing exhaust gas exhausted from the
combustion chamber to recirculate in an intake passage of
the engine, and said inert gas is comprised of a
recirculated exhaust gas.
Claim 9
Dependent Claim
50 words
A compression ignition type engine as set forth
in claim 8, wherein an exhaust gas recirculation rate
when the first combustion is being performed is more than
about 55 percent and an exhaust gas recirculation rate
when the second combustion is being performed is not more
than about 50 percent.
Claim 10
Dependent Claim
87 words
A compression ignition type engine as set forth
in claim 8, wherein said exhaust gas recirculation
apparatus is provided with an exhaust gas recirculation
control valve for controlling an amount of the
recirculated exhaust gas, a throttle valve is disposed in
an intake passage, and the opening degree of the exhaust
gas recirculation control valve and the opening degree of
the throttle valve are made to be reduced when switching
from the second combustion to the first combustion for
release of the NOx from the NOx absorbent.
Claim 11
Dependent Claim
55 words
A compression ignition type engine as set forth
in claim 1, wherein an engine operating region is divided
into a low load side first operating region and a high
load side second operating region, the first combustion
is performed in the first operating region, and the
second combustion is performed in the second operating
region.
Claim 12
Dependent Claim
37 words
A compression ignition type engine as set forth
in claim 1, wherein a catalyst having an oxidation
function is arranged in an exhaust passage of the engine
at either upstream or downstream side of the NOx
absorbent.
Claim 13
Dependent Claim
43 words
A compression ignition type engine as set forth
in claim 1, wherein judging means for judging if the
engine is accelerating or not is provided, and said drive
power generating means generates drive power when it is
judged that the engine is accelerating.
Claim 14
Dependent Claim
65 words
A compression ignition type engine as set forth
in claim 1, wherein judging means for judging if the
engine is decelerating is provided and said drive power
generating means is comprised of an electric motor driven
by a battery, and said electric motor is used as a
generator and power generated from said generator is used
to charge the battery when the engine is decelerating.
References Cited (Backward Citations)
WO1993007363A1
Cited
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