EP0952321A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1999-04-14
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Granted: —
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Expires: 2019-04-14
Abstract
Abstract First combustion mode and second combustion mode are selectively performed. During the first combustion mode, a combustion chamber contains EGR gas of an amount larger than an amount where a generation amount of soot reaches its peak, so that soot is hardly generated. During the second combustion mode, the combustion chamber contains EGR gas of an amount smaller than the amount where the generation amount of soot reaches its peak. A polluta absorber preferably a NOx absorber, is disposed in an engine exhaust passage. In discharging NOx from the NOx absorber, while the first combustion mode is performed, the air-fuel ratio in the combustion chamber is made rich. On the other hand, while the second combustion mode is performed, additional fuel is injected into the combustion chamber in the latter half of an expansion stroke or during an exhaust stroke.
Inventors
- 👤 Kotaro Hayashi
- 👤 Shizuo Sasaki
- 👤 Takekazu Ito
- 👤 Hiroki Murata
- 👤 Masato Gotoh
- 👤 Kouji Yoshizaki
- 👤 Eiji Iwasaki
- 👤 Toshiaki Tanaka
- 👤 Shinya Hirota
- 👤 Nobumoto Ohashi
- 👤 Kazuhiro Ito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 21:10
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/30; F02D41/38; F02D41/40; F02D41/402; F02D41/405; F02B; F02B23/00; F02B23/02; F02B23/06; F02B23/0672; F02B23/0675; F02D41/0025; F02D41/0047; F02D41/005; F02D41/0055; F02D41/02; F02D41/021; F02D41/0235; F02D41/027; F02D41/3011; F02D41/3017; F02D41/3035; F02D41/3064; F02D41/403; F02B1/00; F02B1/12; F02B23/0645; F02B23/066; F02B23/0666; F02B23/0669; F02B3/00; F02B3/06; F02D2041/389; F02D2200/00; F02D2200/02; F02D2200/08; F02D2200/0802; F02D41/0057; F02D41/0275; F02D41/3809; F02F; F02F1/00; F02F1/24; F02F2001/244; F02F2001/247; F02M; F02M26/00; F02M26/02; F02M26/04; F02M26/06; F02M26/13; F02M26/14; F02M26/15; F02M26/22; F02M26/23; F02M26/28; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
238 words
An internal combustion engine (1) wherein in response to an increase of inactive gas in a combustion chamber (5), a generation amount of soot gradually increases and reaches its peak and wherein in response to a further increase of inactive gas in the combustion chamber (5), a temperature of fuel and ambient gas in the combustion chamber (5) during combustion becomes lower than a temperature at which soot is produced so that soot is hardly generated, characterized in that: the internal combustion engine (1) is provided with a switching means (30) for selectively switching between a first combustion mode and a second combustion mode, wherein during the first combustion mode, the combustion chamber (5) contains inactive gas of an amount larger than an amount where a generation amount of soot reaches its peak, so that soot is hardly generated, and wherein during the second combustion mode, the combustion chamber (5) contains inactive gas of an amount smaller than an amount where a generation amount of soot reaches its peak; and additional fuel is injected from the fuel injection valve (6) in the latter half of an expansion stroke or during an exhaust stroke, so that an air-fuel ratio of exhaust gas flowing into a polluta absorber (19), preferably a NOx absorber, is set to a stoichiometric air-fuel ratio or made rich such that pollutas, preferably NOx, are discharged from the polluta absorber (19) during the second combustion mode.
Claim 2
Dependent Claim
62 words
An internal combustion engine (1) according to claim 1, characterized in that when NOx is discharged from the NOx absorber during the second combustion mode, upon opening of an exhaust valve (9), additional fuel is injected from the fuel injection valve (6) toward a space between a back face of a shade portion of the exhaust valve and an exhaust port (10).
Claim 3
Dependent Claim
29 words
An internal combustion engine (1) according to claim 2, characterized in that the additional fuel is injected onto the back face of the shade portion of the exhaust valve.
Claim 4
Dependent Claim
51 words
An internal combustion engine (1) according to any of claims 1 to 3, characterized in that when NOx is discharged from the NOx absorber (19) during the first combustion mode, an air-fuel ratio in the combustion chamber (5) during combustion is temporarily set to the stoichiometric air-fuel ratio or made rich.
Claim 5
Dependent Claim
35 words
An internal combustion engine (1) according to any of claims 1 to 4, characterized in that a catalyst (50, 55) having a function of oxidation is disposed in an engine exhaust passage (18, 54, 58).
Claim 6
Dependent Claim
61 words
An internal combustion engine (1) according to any of claims 1 to 5, characterized in that the internal combustion engine (1) is provided with an exhaust gas recirculation device (22, 23, 24) for recirculating exhaust gas discharged from the combustion chamber (5) into an engine intake passage (8) and in that the inactive gas is composed mainly of exhaust recirculation gas.
Claim 7
Dependent Claim
28 words
An internal combustion engine (1) according to claim 6, characterized in that an exhaust gas recirculation rate preferably during the first combustion mode is about 55% or more.
Claim 8
Dependent Claim
47 words
An internal combustion engine (1) according to any of claims 1 to 7, characterized in that the first combustion mode is performed on a low-load side of an operational area of the engine (1) and in that the second combustion mode is performed on a high-load side.
Claim 9
Dependent Claim
52 words
An internal combustion engine (1) according to any of claims 1 to 8, characterized in that a throttle valve (16) is disposed in an engine intake passage (47) and in that a negative pressure generated in the intake passage (47) downstream of the throttle valve is introduced into a brake booster (80).
Claim 10
Dependent Claim
41 words
An internal combustion engine (1) according to claim 9, characterized in that if the negative pressure introduced into the brake booster (80) has become lower than a preliminarily set negative pressure, an opening degree of the throttle valve (16) is reduced.
Claim 11
Dependent Claim
25 words
An internal combustion engine (1) according to claim 10, characterized in that the preliminarily set negative pressure is increased as a vehicle speed becomes higher.
Claim 12
Dependent Claim
153 words
An internal combustion engine (1) according to claim 9 as far as this claim refers back to claim 6, characterized in that: that the inactive gas is composed of exhaust recirculation gas that is supplied to the intake passage (47) downstream of the throttle valve (16); the exhaust recirculation device comprises an exhaust gas recirculation control valve (23) for controlling a feed rate of the exhaust recirculation gas; wherein the exhaust recirculation gas is supplied to the intake passage (47) downstream of the throttle valve (16); and if the negative pressure introduced into the brake booster (80) has become lower than the preliminarily set negative pressure, first of all, an opening degree of the throttle valve (16) is reduced, and then, if the negative pressure introduced into the brake booster (80) is still lower than the preliminarily set negative pressure, an opening degree of the exhaust gas recirculation control valve (23) is reduced.
Claim 13
Dependent Claim
33 words
An internal combustion engine (1) according to claim 12, characterized in that if the opening degree of the exhaust gas recirculation control valve (23) has been reduced, a fuel injection timing is retarded.
Claim 14
Dependent Claim
35 words
An internal combustion engine (1) according to any of claims 9 to 13 , characterized in that the opening degree of the throttle valve (16) is reduced until the air-fuel ratio assumes a predetermined value.
Claim 15
Dependent Claim
37 words
An internal combustion engine (1) according to any of claims 1 to 14, characterized in that the catalyst (50, 55) is composed of at least one of an oxidizing catalyst, a three-way catalyst and an NOx absorber.
Claim 16
Dependent Claim
28 words
An internal combustion engine (1) according to any of claims 1 to 15, characterized in that the fuel injection valve (6) is disposed in the combustion chamber (5).
References Cited (Backward Citations)
WO1993007363A1
Cited
EP0879946A2
Cited
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