US5738832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas purifying apparatus
Assignee: Mitsubishi Motors Corp
•
Filing: 1996-03-26
•
Granted: 1998-04-14
•
Expires: 2016-03-26
Abstract
Abstract An exhaust gas purifying apparatus, which is intended to improve hydrocarbon purifying performance and simplify the after-treatment of adsorbed hydrocarbon, an in which a three way valve 51 is operated under the control of a controller 80 to cause a bypass exhaust gas passage 30 to be communicated with a main exhaust gas passage, so that hydrocarbon in exhaust gas is adsorbed onto an adsorption catalyst 40 when the temperature of a three way catalyst 20 in the main exhaust gas passage 13 is low. When the three way catalyst temperature increases, the bypass exhaust gas passage is shut off from the main exhaust gas passage by the three way valve and the adsorption catalyst is heated by a heater 60, so that the adsorbed hydrocarbon is oxidized at the adsorption catalyst to form a harmless substance.
Inventors
- 👤 Takashi Dogahara
- 👤 Kazuo Koga
- 👤 Yoshiaki Danno
- 👤 Daisuke Sanbayashi
- 👤 Kozo Iida
- 👤 Satoru Serizawa
- 👤 Norihisa Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:55
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9481; B01D53/9495; F; F01; F01N; F01N13/00; F01N13/009; F01N3/00; F01N3/08; F01N3/0807; F01N3/0828; F01N3/0835; F01N3/0871; F01N3/0878; F01N3/10; F01N3/18; F01N3/20; F01N3/2053; F01N9/00; F01N2250/00; F01N2250/12; F01N2410/00; F01N2410/12; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
184 words
An exhaust gas purifying apparatus comprising: a main catalyst interposed in a main exhaust gas passage for purifying exhaust gas from an engine, the main exhaust gas passage being communicated with an exhaust side of an engine; an adsorbent interposed in a bypass exhaust gas passage for adsorbing hydrocarbon contained in the exhaust gas, the bypass exhaust gas passage being communicated at least at its upstream end with the main exhaust gas passage, said adsorbent having a catalytic function of oxidizing adsorbed hydrocarbon in a predetermined temperature range; heating means for heating said adsorbent; exhaust route selecting means for selectively inhibiting communication between the bypass exhaust gas passage and the main exhaust gas passage at least at one end of the bypass exhaust gas passage; and control means for prohibiting an operation of said exhaust route selecting means at start of the engine, and for causing said exhaust route selecting means to operate when a predetermined condition is satisfied after the start of the engine; whereby said adsorbent is heated by said heating means after said exhaust route selecting means is caused to operate.
Claim 2
Dependent Claim
184 words
An exhaust gas purifying apparatus comprising: a main catalyst interposed in a main exhaust gas passage for purifying exhaust gas from an engine, the main exhaust gas passage being communicated with an exhaust side of an engine; an adsorbent interposed in a bypass exhaust gas passage for adsorbing hydrocarbon contained in the exhaust gas, the bypass exhaust gas passage being communicated at least at its upstream end with the main exhaust gas passage, said adsorbent having a catalytic function of oxidizing adsorbed hydrocarbon in a predetermined temperature range; heating means for heating said adsorbent; exhaust route selecting means for selectively inhibiting communication between the bypass exhaust gas passage and the main exhaust gas passage at least at one end of the bypass exhaust gas passage; and control means for prohibiting an operation of said exhaust route selecting means at start of the engine, and for causing said exhaust route selecting means to operate when a predetermined condition is satisfied after the start of the engine; whereby said adsorbent is heated by said heating means after said exhaust route selecting means is caused to operate.
Claim 3
Dependent Claim
20 words
The exhaust gas purifying apparatus according to claim 1, wherein said adsorbent is formed of crystalline silicate which carries copper.
Claim 4
Dependent Claim
54 words
The exhaust gas purifying apparatus according to claim 1, further comprising: temperature detecting means for detecting a main catalyst temperature or an exhaust gas temperature near said main catalyst; and wherein said predetermined condition is satisfied when the main catalyst temperature or the exhaust gas temperature near said main catalyst exceeds a predetermined value.
Claim 5
Dependent Claim
50 words
The exhaust gas purifying apparatus according to claim 1, further comprising: temperature detecting means for detecting an adsorbent temperature or an exhaust gas temperature near said adsorbent; and wherein said predetermined condition is satisfied when the adsorbent temperature or the exhaust gas temperature near said adsorbent exceeds a predetermined value.
Claim 6
Dependent Claim
32 words
The exhaust gas purifying apparatus according to claim 4, wherein the heating of said adsorbent performed by said heating means is stopped before said adsorbent temperature reaches a adsorbent deteriorating temperature range.
Claim 7
Dependent Claim
39 words
The exhaust gas purifying apparatus according to claim 1, further comprising: temperature detecting means detects for detecting an engine cooling water temperature: and wherein said predetermined condition is satisfied when the engine cooling water temperature exceeds a predetermined value.
Claim 8
Dependent Claim
22 words
The exhaust gas purifying apparatus according to claim 1, wherein said predetermined condition is satisfied when a predetermined time period has elapsed.
Claim 9
Dependent Claim
44 words
The exhaust gas purifying apparatus according to claim 7, further comprising: temperature detecting means detects for detecting an engine cooling water temperature; and wherein said predetermined time period is set in accordance with the engine cooling water temperature at the start of the engine.
Claim 10
Dependent Claim
51 words
The exhaust gas purifying apparatus according to claim 1, further comprising: a preliminary catalyst for purifying exhaust gas, the preliminary catalyst being arranged in the main exhaust gas passage on an upstream side of a portion of which said main exhaust gas passage is communicated with said bypass exhaust gas passage.
Claim 11
Dependent Claim
54 words
The exhaust gas purifying apparatus according to claim 9, further comprising: temperature detecting means for detecting a preliminary catalyst temperature or an exhaust gas temperature near said preliminary catalyst; and wherein said predetermined condition is satisfied when the preliminary catalyst temperature or the exhaust gas temperature near said preliminary catalyst exceeds a predetermined value.
Claim 12
Dependent Claim
17 words
The exhaust gas purifying apparatus according to claim 1, wherein said heating means is an electric heater.
Claim 13
Dependent Claim
16 words
The exhaust gas purifying apparatus according to claim 11, wherein said heating means utilizes exhaust heat.
Claim 14
Dependent Claim
35 words
The exhaust gas purifying apparatus according to claim 12, wherein said heating means is comprised of arranging said adsorbent at a position at which heat transfer is allowed from said main catalyst to said adsorbent.
Claim 15
Dependent Claim
29 words
The exhaust gas purifying apparatus according to claim 13, wherein said adsorbent is arranged so that at least one end thereof is exposed to the main exhaust gas passage.
References Cited (Backward Citations)
US3791143A
Cited
US4023360A
Cited
US4817385A
Cited
JPH01257710A
Cited
US4985210A
Cited
US5067319A
Cited
JPH03165816A
Cited
US5158753A
Cited
JPH03194113A
Cited
JPH03229638A
Cited
US5125231A
Cited
US5264186A
Cited
JPH0518236A
Cited
JPH0544446A
Cited
US5315824A
Cited
JPH05149131A
Cited
US5388405A
Cited
US5271906A
Cited
JPH0633752A
Cited
US5398503A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-04-13 | 2001-10-13 | 2002-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-04-13 | 2005-10-13 | 2006-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-04-13 | 2009-10-13 | 2010-04-14 | $7700.00 | Window Closed / Lapsed |