US4125098A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multicylinder engine
Assignee: Mitsubishi Motors Corp
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Filing: 1976-06-17
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Granted: 1978-11-14
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Expires: 1996-06-17
Abstract
Abstract A multicylinder engine comprising at least one first cylinder, a corresponding number of second cylinder, and a carburetor to supply a fuel-air mixture leaner than stoichiometric to all the first and second cylinders. When required by the driving range and other driving conditions, a rich mixture is supplied to the second cylinder to lower the air-fuel ratio in it for the purpose of exhaust emission purification, while the first cylinder is being supplied with the lean mixture.
Inventors
- 👤 Yuhiko Kiyota
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:01
CPC Classifications
F; F02; F02M; F02M13/00; F02M13/02; F02M13/04; F02M13/046; F02B; F02B1/00; F02B1/02; F02B1/04; F02B1/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
256 words
A multicylinder engine which comprises at least a first cylinder and a second cylinder; a carburetor for supplying a fuel-air mixture leaner than stoichimetric; means defining a first passage connecting said carburetor with said first and second cylinders for flowing said mixture leaner than stoichiometric from said carburetor to said first and second cylinders; rich mixture supplying means for supplying a fuel-air mixture richer than stoichiometric, integral with said carburetor; and means defining a second passage connecting said rich mixture supplying means with said second cylinder for flowing said mixture richer than stoichiometric to said second cylinder; wherein said carburetor includes a primary mixture passage open at one end to the atmosphere for receiving air, and a venturi having a primary fuel nozzle disposed within said primary mixture passage for mixing air flowing through said primary mixture passage with fuel flowing from said primary fuel nozzle; and wherein said rich mixture supplying means includes a rich mixture forming passage opening in said primary mixing passage to the atmosphere upstream of the carburetor venturi, a throttle valve positioned in said rich mixture forming passage to regulate the mixture flow rate therein, a fuel supply passage opening into said rich mixture forming passage at least downstream of said throttle valve, a first valve disposed upstream of said throttle valve for closing said rich mixture forming passage upstream of said throttle valve, a second valve for closing said fuel supply passage, and valve control means for simultaneously opening and closing both said first and second valves at predetermined temperatures.
Claim 2
Dependent Claim
256 words
A multicylinder engine which comprises at least a first cylinder and a second cylinder; a carburetor for supplying a fuel-air mixture leaner than stoichimetric; means defining a first passage connecting said carburetor with said first and second cylinders for flowing said mixture leaner than stoichiometric from said carburetor to said first and second cylinders; rich mixture supplying means for supplying a fuel-air mixture richer than stoichiometric, integral with said carburetor; and means defining a second passage connecting said rich mixture supplying means with said second cylinder for flowing said mixture richer than stoichiometric to said second cylinder; wherein said carburetor includes a primary mixture passage open at one end to the atmosphere for receiving air, and a venturi having a primary fuel nozzle disposed within said primary mixture passage for mixing air flowing through said primary mixture passage with fuel flowing from said primary fuel nozzle; and wherein said rich mixture supplying means includes a rich mixture forming passage opening in said primary mixing passage to the atmosphere upstream of the carburetor venturi, a throttle valve positioned in said rich mixture forming passage to regulate the mixture flow rate therein, a fuel supply passage opening into said rich mixture forming passage at least downstream of said throttle valve, a first valve disposed upstream of said throttle valve for closing said rich mixture forming passage upstream of said throttle valve, a second valve for closing said fuel supply passage, and valve control means for simultaneously opening and closing both said first and second valves at predetermined temperatures.
Claim 3
Dependent Claim
58 words
A multicylinder engine as set forth in claim 1, wherein said carburetor further comprises a throttle valve in said primary mixture forming passage to control the flow rate of the lean mixture from said carburetor; and means for interlocking said throttle valve in said primary mixture forming passage with said throttle valve in the rich mixture forming passage.
Claim 4
Dependent Claim
64 words
A multicylinder engine as set forth in claim 1, wherein said valve control means includes first and second solenoids connected to said first and second valves; a switch responsive to engine cooling water temperature; and means connecting said first and second solenoids and said switch in series to form a control circuit in which both said solenoids operate according to the cooling water temperature.
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) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |