US3828552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for reducing toxic compounds in exhaust gases from internal combustion engines
Assignee: Nissan Motor Co Ltd
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Filing: 1972-11-08
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Granted: 1974-08-13
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Expires: 1992-11-08
Abstract
Abstract A system for reducing toxic compounds in exhaust gases emitted from a gasoline powered internal combustion engine, which system includes an air-denitrogenating unit which is adapted to separate nitrogen molecules from the atmospheric air. The nitrogen molecules separated by the air-denitrogenating unit is introduced into an air induction passage of the engine so as to enrich an air-fuel mixture to be supplied into the engine for thereby reducing the concentration of nitrogen oxides in the engine exhaust gases. The denitrogenated air containing a large proportion of oxygen therein is supplied into an exhaust manifold of the engine as secondary air for effecting oxidizing reactions of unburned hydrocarbons and carbon monoxide in the engine exhaust gases.
Inventors
- 👤 K Nishiguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:40
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/0807; F01N3/0828; F01N3/0857; F01N13/00; F01N13/009; F01N13/0097; F01N3/10; F01N3/18; F01N3/22; F01N3/222; F02; F02B; F02B75/00; F02B75/10; F02D; F02D21/00; F02D21/06; F02D21/10; F02M; F02M2700/00; F02M2700/34; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
174 words
A system for reducing toxic compounds in exhaust gases emitted from a gasoline powered internal Combustion engine having an air induction passage and an exhaust manifold, comprising a first branch conduit branched off from said air induction passage, a first suction pump connected to said first branch conduit for sucking in atmospheric air from said air induction passage, and air denitrogenating unit connected to said first branch conduit through said suction pump for denitrogenating air supplied through said branch conduit, a second suction pump connected to said air-denitrogenating unit for separating nitrogen molecules deposited in said air-denitrogenating unit, a second branch conduit branched off from said air induction passage at a point downstream of said first branch conduit and connected to said second suction pump for delivering nitrogen separated from said air-denitrogenating unit into said air induction passage, and a denitrogenated air supply conduit connected to said air-denitrogenating unit and to said exhaust manifold of said engine for supplying denitrogenated air containing a large portion of oxygen into said exhaust manifold of said engine.
Claim 2
Independent Claim
174 words
A system for reducing toxic compounds in exhaust gases emitted from a gasoline powered internal Combustion engine having an air induction passage and an exhaust manifold, comprising a first branch conduit branched off from said air induction passage, a first suction pump connected to said first branch conduit for sucking in atmospheric air from said air induction passage, and air denitrogenating unit connected to said first branch conduit through said suction pump for denitrogenating air supplied through said branch conduit, a second suction pump connected to said air-denitrogenating unit for separating nitrogen molecules deposited in said air-denitrogenating unit, a second branch conduit branched off from said air induction passage at a point downstream of said first branch conduit and connected to said second suction pump for delivering nitrogen separated from said air-denitrogenating unit into said air induction passage, and a denitrogenated air supply conduit connected to said air-denitrogenating unit and to said exhaust manifold of said engine for supplying denitrogenated air containing a large portion of oxygen into said exhaust manifold of said engine.
Claim 3
Dependent Claim
31 words
A system as claimed in claim 1, wherein said air-denitrogenating unit includes at least two nitrogen separating means which are alternately operable for denitrogenating air supplied through said first branch conduit.
Claim 4
Independent Claim
298 words
A system for reducing toxic compounds in exhaust gases emitted from a gasoline powered internal combustion engine having an air induction passage and an exhaust manifold, comprising a first branch conduit branched off from said air induction passage, a first suction pump connected to said first branch conduit for sucking in atmospheric air from said air induction passage, a first four-way flow shut-off valve connected to said first suction pump, an air-denitrogenating unit including at least two nitrogen separating means which are alternately operable for denitrogenating air supplied from said first suction pump, said nitrogen separating means having inlets respectively which are connected through said first four-way flow shut-off valve to said first suction pump and having outlets respectively, a second four-way flow shut-off valve connected to the outlets of said nitrogen separating means, first and second nitrogen discharge conduits connected to said first and second four-way flow shut-off valves, a second suction pump connected to said first and second nitrogen discharge conduits and selectively communicating with one of said nitrogen separating means through said first and second four-way flow shut-off valves for separating nitrogen molecules deposited in said one of said nitrogen separating means, a second branch conduit branched off from said air induction passage of said engine at a point downstream of said first branch conduit and connected to said second suction pump for supplying nitrogen separated from said one of said nitrogen separating means into said air induction passage, and a denitrogenated air supply conduit connected between said second four-way flow shut-off valve and said exhaust manifold of said engine and selectively communicating with another one of said nitrogen separating means through said second four-way flow shut-off valve for directing denitrogenated air containing a large proportion of oxygen into said exhaust manifold of said engine.
Claim 5
Independent Claim
298 words
A system for reducing toxic compounds in exhaust gases emitted from a gasoline powered internal combustion engine having an air induction passage and an exhaust manifold, comprising a first branch conduit branched off from said air induction passage, a first suction pump connected to said first branch conduit for sucking in atmospheric air from said air induction passage, a first four-way flow shut-off valve connected to said first suction pump, an air-denitrogenating unit including at least two nitrogen separating means which are alternately operable for denitrogenating air supplied from said first suction pump, said nitrogen separating means having inlets respectively which are connected through said first four-way flow shut-off valve to said first suction pump and having outlets respectively, a second four-way flow shut-off valve connected to the outlets of said nitrogen separating means, first and second nitrogen discharge conduits connected to said first and second four-way flow shut-off valves, a second suction pump connected to said first and second nitrogen discharge conduits and selectively communicating with one of said nitrogen separating means through said first and second four-way flow shut-off valves for separating nitrogen molecules deposited in said one of said nitrogen separating means, a second branch conduit branched off from said air induction passage of said engine at a point downstream of said first branch conduit and connected to said second suction pump for supplying nitrogen separated from said one of said nitrogen separating means into said air induction passage, and a denitrogenated air supply conduit connected between said second four-way flow shut-off valve and said exhaust manifold of said engine and selectively communicating with another one of said nitrogen separating means through said second four-way flow shut-off valve for directing denitrogenated air containing a large proportion of oxygen into said exhaust manifold of said engine.
Claim 6
Dependent Claim
34 words
A system as claimed in claim 3, further comprising an additional air supply conduit connected to said first suction pump and communicating with said exhaust manifold of said engine for supplying additional air thereinto.
Claim 7
Dependent Claim
55 words
A system as claimed in claim 3, wherein each of said nitrogen separating means includes first and second dehumidifying layers located adjacent the inlet and outlet respectively, a carbon dioxide absorbent layer located adjacent said first dehumidifying layer, and a nitrogen absorbent layer located between said carbon dioxide absorbent layer and said second dehumidifying layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-12 | 1978-02-11 | 1978-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-12 | 1982-02-11 | 1982-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-12 | 1986-02-11 | 1986-08-13 | $7700.00 | Window Closed / Lapsed |