Patent EP0947685A2 successfully refreshed from Google Patents.
EP0947685A2
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Compression ignition type engine
Assignee: Toyota Motor Corp
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Filing: 1999-03-29
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Granted: —
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Expires: 2019-03-29
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 and wherein the air-fuel ratio is temporarily made rich immediately before switching from the first combustion to the second combustion or immediately after switching from the second combustion to the first combustion. <IMAGE>
Inventors
- 👤 Nobumoto Toyota Jidosha Kabushiki Kaisha Ohashi
- 👤 Toshiaki Toyota Jidosha Kabushiki Kaisha Tanaka
- 👤 Eiji Toyota Jidosha Kabushiki Kaisha Iwasaki
- 👤 Shinya Toyota Jidosha Kabushiki Kaisha Hirota
- 👤 Kouji Toyota Jidosha Kabushiki Kaisha YOSHIZAKI
- 👤 Kasuhiro Toyota Jidosha Kabushiki Kaisha Itoh
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 19:31
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/3809; F02D41/3827; F01; F01N; F01N3/00; F01N3/08; F01N3/0807; F01N3/0828; F01N3/0842; F02B; F02B47/00; F02B47/04; F02B47/08; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0057; F02D41/3011; F02D41/3064; F02B3/00; F02B3/06; F02D41/0002; F02D2041/0022; F02D2041/389; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0602; F02D2250/00; F02D2250/31; F02D2250/32; F02D41/3836; F02D41/3845; F02M; F02M26/00; F02M26/13; F02M26/14; F02M26/15; F02M26/22; F02M26/23; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
205 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 supplied in a
combustion chamber increases and in which a further
increase of the amount of inert gas supplied in the
combustion chamber results in a temperature of fuel and
surrounding gas 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: a catalyst arranged in an engine exhaust
passage and carrying a precious metal; switching means for selectively switching
between a first combustion where the amount of the inert
gas supplied to 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 supplied to the
combustion chamber is smaller than the amount of inert
gas where the amount of production of soot peaks; and air-fuel ratio control means for making an
air-fuel ratio at least temporarily rich under the first
combustion when switching from the first combustion to
second combustion or switching from the second combustion
to the first combustion.
Claim 2
Dependent Claim
65 words
A compression ignition type engine as set forth
in claim 1, wherein the first combustion and the second
combustion are normally performed under a lean air-fuel
ratio and wherein said air-fuel ratio control means makes
the air-fuel ratio under the first combustion temporarily
rich when switching from the first combustion to the
second combustion or when switching from the second
combustion to the first combustion.
Claim 3
Dependent Claim
97 words
A compression ignition type engine as set forth
in claim 2, wherein: an engine operating region is
divided into a low load side first operating region where
the first combustion is performed and a high load side
second operating region where the second combustion is
performed, and said air-fuel ratio control means makes
the air-fuel ratio under the first combustion temporarily
rich when the engine operating state is switched from the
first operating region to the second operating region or
when the engine operating state is switched from the
second operating region to the first operating region.
Claim 4
Dependent Claim
126 words
A compression ignition type engine as set forth
in claim 1, wherein: an engine operating region is
divided into a low load side region where the first
combustion is performed under a lean air-fuel ratio, a
high load side region where the second combustion is
performed under a lean air-fuel ratio, and a region
between said low load side region and high load side
region where the first combustion is performed under a
rich air-fuel ratio, and the first combustion is
performed under a rich air-fuel ratio when the engine
operating state is switched from the low load side region
to the high load side region or when the engine operating
state is switched from the high load side region to the
low load side region.
Claim 5
Dependent Claim
44 words
A compression ignition type engine as set forth
in claim 1, wherein an exhaust gas recirculation
apparatus is provided for recirculating exhaust gas
exhausted from a combustion chamber into an engine intake
passage and wherein the inert gas is comprised of
recirculated exhaust gas.
Claim 6
Dependent Claim
49 words
A compression ignition type engine as set forth
in claim 5, wherein an exhaust gas recirculation rate
when the first combustion is being performed is more than
about 55 percent and the exhaust gas recirculation rate
when the second combustion is being performed is less
than about 50 percent.
Claim 7
Dependent Claim
28 words
A compression ignition type engine as set forth
in claim 1, wherein the catalyst is comprised of at least
one of an oxidation catalyst and a three-way catalyst.
Claim 8
Dependent Claim
66 words
A compression ignition type engine as set
forth in claim 1, wherein the catalyst is comprised of a
NOx absorbent which absorbs NOx contained in an exhaust
gas when an air-fuel ratio of exhaust gas flowing into
the NOx absorbent is lean and releases the absorbed NOx
when the air-fuel ratio of exhaust gas flowing into the
NOx absorbent is the stoichiometric air-fuel ratio or
rich.
References Cited (Backward Citations)
JPH04334750A
Cited
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