US4147141A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas recirculation system in an internal combustion engine
Assignee: Toyota Motor Corp
•
Filing: 1977-11-07
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Granted: 1979-04-03
•
Expires: 1997-11-07
Abstract
Abstract This application discloses an exhaust gas recirculation system in an internal combustion engine. The system comprises: An EGR pipe which interconnects an exhaust pipe and an intake pipe of the engine; An EGR valve mounted on said EGR pipe; An EGR cooler mounted on said EGR pipe upstream of said EGR valve; A by-pass pipe arranged parallel to said EGR cooler; A thermosensor which detects the EGR gas temperature; and, A selection valve arranged at the connection point of said by-pass pipe to said EGR pipe, said selection valve co-operating with said thermosensor so that when the EGR gas temperature is low, the EGR gas passes through said by-pass pipe.
Inventors
- 👤 Tetsuro Nagano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:51
CPC Classifications
F; F02; F02M; F02M26/00; F02M26/52; F02M26/55; F02M26/56; F02M26/57; F02M26/13; F02M26/22; F02M26/23; F02M26/25; F02M26/26; F02M26/39; F02M26/45; F02M26/46; F02M26/47; F02M26/65; F02M26/70; F02M2026/001; F02M2026/002; F02M26/71
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
107 words
An EGR system in an internal combustion engine comprising: an EGR pipe which interconnects an exhaust pipe and an intake pipe of the engine; an EGR valve mounted on said EGR pipe; an EGR cooler mounted on said EGR pipe upstream of said EGR valve; a by-pass pipe arranged parallel to said EGR cooler; a thermosensor which detects the EGR gas temperature; and a selection valve arranged at the connection point of said by-pass pipe to said EGR pipe, said selection valve co-operating with said thermosensor so that when the EGR gas temperature is lower than a predetermined value, the EGR gas passes through said by-pass pipe.
Claim 2
Dependent Claim
107 words
An EGR system in an internal combustion engine comprising: an EGR pipe which interconnects an exhaust pipe and an intake pipe of the engine; an EGR valve mounted on said EGR pipe; an EGR cooler mounted on said EGR pipe upstream of said EGR valve; a by-pass pipe arranged parallel to said EGR cooler; a thermosensor which detects the EGR gas temperature; and a selection valve arranged at the connection point of said by-pass pipe to said EGR pipe, said selection valve co-operating with said thermosensor so that when the EGR gas temperature is lower than a predetermined value, the EGR gas passes through said by-pass pipe.
Claim 3
Dependent Claim
22 words
An EGR system according to claim 1, wherein said selection valve is of a three-way cock type and actuated by a motor.
Claim 4
Dependent Claim
55 words
An EGR system according to claim 1, wherein said selection valve comprises a valve body having three ports and a valve movably arranged within said valve body, said thermosensor being a bimetal element arranged within said valve body so that the bimetal element forces the valve to move in response to the EGR gas temperature.
Claim 5
Dependent Claim
17 words
An EGR system according to claim 1, wherein said selection valve is of a butterfly valve type.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-04-02 | 1982-10-02 | 1983-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-04-02 | 1986-10-02 | 1987-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-04-02 | 1990-10-02 | 1991-04-03 | $7700.00 | Window Closed / Lapsed |