US4665692A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine exhaust control system
Assignee: Nissan Motor Co Ltd
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Filing: 1986-01-06
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Granted: 1987-05-19
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Expires: 2006-01-06
Abstract
Abstract An exhaust control system for use in an internal combustion engine for controlling the flow of exhaust gases discharged from the engine to the atmosphere. The apparatus determines a first condition representing the engine speed being higher than a predetermined value, a second condition representing the transmission being not in neutral, and a third condition representing the throttle valve being not at or near its closed position. A control circuit generates a command signal only upon simultaneous occurrence of the first, second and third conditions. The apparatus includes a device responsive to the command signal from the control circuit for increasing the effective area of the exhaust passage.
Inventors
- 👤 Motohiro Inaba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:23
CPC Classifications
F; F01; F01N; F01N9/00; F01N1/00; F01N1/16; F01N1/165; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
119 words
An apparatus for use in an internal combustion engine including a throttle valve, a transmission, and an exhaust passage having an effective area through which exhaust gases are discharged to the atmosphere, comprising: means for determining a first condition representing the engine speed being higher than a predetermined value; means for determining a second condition representing the transmission being not in neutral; means for determining a third condition representing the throttle valve being not at or near its closed position; a control circuit for generating a command signal only upon simultaneous occurrence of the first, second and third conditions; and means responsive to the command signal from the control circuit for increasing the effective area of the exhaust passage.
Claim 2
Independent Claim
119 words
An apparatus for use in an internal combustion engine including a throttle valve, a transmission, and an exhaust passage having an effective area through which exhaust gases are discharged to the atmosphere, comprising: means for determining a first condition representing the engine speed being higher than a predetermined value; means for determining a second condition representing the transmission being not in neutral; means for determining a third condition representing the throttle valve being not at or near its closed position; a control circuit for generating a command signal only upon simultaneous occurrence of the first, second and third conditions; and means responsive to the command signal from the control circuit for increasing the effective area of the exhaust passage.
Claim 3
Dependent Claim
90 words
The apparatus as claimed in claim 1, wherein the exhaust passage has a downstream end portion divided into at least two branches, and wherein the effective area increasing means includes: a valve provided in one of the exhaust passage branches, the valve being at a closed position to close the one exhaust passage branch; and drive means responsive to the command signal from the control circuit for moving the valve to an open position to open the one exhaust passage branch, thereby increasing the effective area of the exhaust passage.
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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) | 1990-05-18 | 1990-11-17 | 1991-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-18 | 1994-11-17 | 1995-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-18 | 1998-11-17 | 1999-05-19 | $7700.00 | Window Closed / Lapsed |