Patent US4333428A successfully refreshed from Google Patents.
US4333428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal combustion engine
Assignee: Nissan Motor Co Ltd
•
Filing: 1979-12-19
•
Granted: 1982-06-08
•
Expires: 1999-12-19
Abstract
Abstract An internal combustion engine is disclosed which includes a plurality of cylinders split into first and second groups and operates in a split cylinder mode under low engine load conditions where the second group of cylinders are held suspended. Means is provided for holding the combustion chambers of the second group of cylinders in communication with the exhaust passage during a split cylinder mode of operation.
Inventors
- 👤 Toshiaki Tanaka
- 👤 Yukihiro Etoh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:36
CPC Classifications
F; F02; F02D; F02D17/00; F02D17/02
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
163 words
An internal combusion engine comprising: (a) first and second cylinder units each including at least one cylinder having a combustion chamber defined by a cylinder block and a cylinder head mounted on said cylinder block, each of said combustion chambers being connected through an exhaust valve to an exhaust port formed in said cylinder head; (b) a bypass passage associated with each cylinder of said second cylinder unit, said bypass passage opening at its one end into said exhaust port and at the other end into said combustion chamber providing communication therebetween to bypass said exhaust valve; (c) a bypass valve provided in said bypass passage, said bypass valve being normally in its closed position to interrupt communication between said exhaust port and said combustion chamber; and (d) control means responsive to engine low load conditions for disabling said second cylinder unit and placing said bypass valve into its open position to provide said communication between said exhaust port and said combustion chamber.
Claim 2
Dependent Claim
163 words
An internal combusion engine comprising: (a) first and second cylinder units each including at least one cylinder having a combustion chamber defined by a cylinder block and a cylinder head mounted on said cylinder block, each of said combustion chambers being connected through an exhaust valve to an exhaust port formed in said cylinder head; (b) a bypass passage associated with each cylinder of said second cylinder unit, said bypass passage opening at its one end into said exhaust port and at the other end into said combustion chamber providing communication therebetween to bypass said exhaust valve; (c) a bypass valve provided in said bypass passage, said bypass valve being normally in its closed position to interrupt communication between said exhaust port and said combustion chamber; and (d) control means responsive to engine low load conditions for disabling said second cylinder unit and placing said bypass valve into its open position to provide said communication between said exhaust port and said combustion chamber.
Claim 3
Dependent Claim
25 words
An internal combustion engine according to claim 1, wherein said bypass passage extends through said cylinder block between said exhaust port and said combustion chamber.
Claim 4
Dependent Claim
25 words
An internal combustion engine according to claim 1, wherein said bypass passage extends through said cylinder head between said exhaust port and said combustion chamber.
References Cited (Backward Citations)
US3703164A
Cited
US3982514A
Cited
US4064861A
Cited
US4201180A
Cited
US4249374A
Cited
US4224920A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-06-07 | 1985-12-07 | 1986-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-06-07 | 1989-12-07 | 1990-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-06-07 | 1993-12-07 | 1994-06-08 | $7700.00 | Window Closed / Lapsed |