Patent EP0764771A2 successfully refreshed from Google Patents.
EP0764771A2
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EP
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Compression ignition type engine
Assignee: Toyota Motor Corp
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Filing: 1996-09-20
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Granted: —
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Expires: 2016-09-20
Abstract
Abstract A compression ignition type engine comprising an NO x absorbent arranged in its exhaust passage. This NO x absorbent absorbs NO x when the air-fuel ratio of the inflowing exhaust gas is lean and releases the absorbed NO x when the air-fuel ratio of the exhaust gas is rich. When NO x should be released from the NO x absorbent, the mean value of the air-fuel ratio in the combustion chamber is changed from lean to rich. At least at this time, use is made of fuel containing oxygen as the injected fuel.
Inventors
- 👤 Hiromichi C/O Toyota Jidosha K.K. Yanagihara
- 👤 Kiyoshi c/o Toyota Jidosha K.K. Kobashi
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 18:34
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/0047; F02D41/005; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9481; B01D53/9495; F01; F01N; F01N3/00; F01N3/08; F01N3/0807; F01N3/0828; F01N3/0842; F01N3/0871; F02D41/02; F02D41/021; F02D41/0235; F02D41/027; F02D41/0275; F02D41/30; F02D41/38; F02B; F02B3/00; F02B3/06; F02D41/0002; F02D2041/0022; F02D2200/00; F02D2200/02; F02D2200/06; F02D2200/0611; F02D2200/0612; F02D2250/00; F02D2250/32; F02M; F02M26/00; F02M26/13; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
160 words
A compression ignition type engine having an exhaust passage, comprising: an NO x absorbent arranged in the exhaust passage, said NO x absorbent absorbing NO x when an air-fuel ratio of exhaust gas flowing into said NO x absorbent is lean and releasing the absorbed NO x when said air-fuel ratio of exhaust gas is one of a rich air-fuel ratio and the stoichiometric air-fuel ratio; and air-fuel ratio control means for normally maintaining the mean value of the air-fuel ratio in a combustion chamber of the engine at a lean air-fuel ratio and changing over said mean value of the air-fuel ratio from a lean air-fuel ratio to one of a rich air-fuel ratio and the stoichiometric air-fuel ratio when NO x should be released from said NO x absorbent, a fuel containing oxygen therein being used at least when said mean value of air-fuel ratio is made one of a rich air-fuel ratio and the stoichiometric air-fuel ratio.
Claim 2
Dependent Claim
27 words
A compression ignition type engine according to claim 1, wherein the fuel containing oxygen is used also when the mean value of the air-fuel ratio is lean.
Claim 3
Dependent Claim
71 words
A compression ignition type engine according to claim 1, wherein exhaust gas recirculation control means is provided for controlling an amount of exhaust gas recirculated from the exhaust passage to an intake passage of the engine to increase said amount of exhaust gas when said mean value of the air-fuel ratio is changed over from a lean air-fuel ratio to one of a rich air-fuel ratio and the stoichiometric air-fuel ratio.
Claim 4
Dependent Claim
53 words
A compression ignition type engine according to claim 1, wherein a throttle valve is provided in the intake passage of the engine and when the mean value of the air-fuel ratio is changed from lean to one of the stoichiometric air-fuel ratio and rich, the opening of the throttle valve is made smaller.
Claim 5
Dependent Claim
37 words
A compression ignition type engine according to claim 1, wherein when the mean value of the air-fuel ratio is changed from lean to one of the stoichiometric air-fuel ratio and rich, the fuel injection amount is increased.
Claim 6
Dependent Claim
33 words
A compression ignition type engine according to claim 1, wherein when releasing NO x from the NO x absorbent, the mean value of the air-fuel ratio is made rich in a spike manner.
Claim 7
Dependent Claim
49 words
A compression ignition type engine according to claim 1, wherein exhaust gas recirculation control means is provided for controlling an amount of exhaust gas recirculated from the exhaust passage to an intake passage of the engine to increase said amount of exhaust gas as an engine load becomes low.
Claim 8
Dependent Claim
37 words
A compression ignition type engine according to claim 7, wherein a throttle valve is provided in the intake passage of the engine and the opening of the throttle valve is made smaller the lower the engine load.
Claim 9
Dependent Claim
53 words
A compression ignition type engine according to claim 1, further provided with an air-fuel ratio sensor arranged in the exhaust passage and air-fuel ratio feedback control means for controlling by feedback the mean value of the air-fuel ratio to the target air-fuel ratio based on an output signal of the air-fuel ratio sensor.
Claim 10
Dependent Claim
36 words
A compression ignition type engine according to claim 9, wherein said air-fuel ratio feedback control means controls the mean value of the air-fuel ratio to the target lean air-fuel ratio by controlling the fuel injection amount.
Claim 11
Dependent Claim
67 words
A compression ignition type engine according to claim 9, where exhaust gas recirculation control means is provided for controlling the amount of the exhaust gas recirculated from the exhaust passage to the intake passage of the engine and where the air-fuel ratio feedback control means controls the mean value of the air-fuel ratio to the target lean air-fuel ratio by controlling the amount of recirculated exhaust gas.
Claim 12
Dependent Claim
26 words
A compression ignition type engine according to claim 9, wherein the target air-fuel ratio becomes closer to the stoichiometric air-fuel ratio the higher the engine load.
Claim 13
Dependent Claim
27 words
A compression ignition type engine according to claim 1, wherein the fuel containing oxygen is comprised of fuel containing oxygen in the molecules of the hydrocarbons themselves.
Claim 14
Dependent Claim
25 words
A compression ignition type engine according to claim 1, wherein the fuel containing oxygen is comprised of fuel obtained by adding an additive containing oxygen.
References Cited (Backward Citations)
DE3343677A1
Cited
DE3800585A1
Cited
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