US3850151A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Failure warning device for exhaust gas recirculation system
Assignee: Nissan Motor Co Ltd
•
Filing: 1973-09-07
•
Granted: 1974-11-26
•
Expires: 1993-09-07
Abstract
Abstract A detector which actuates a relay to energize an alarm in response to a inoperability of an exhaust gas recirculation system metering valve.
Inventors
- 👤 T Mawatari
- 👤 T Kunugi
- 👤 M Harada
- 👤 K Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:18
CPC Classifications
F; F02; F02B; F02B77/00; F02B77/08; F02M; F02M26/00; F02M26/45; F02M26/48; F02M26/49; F02M26/52; F02M26/55; F02M26/65; F02M26/72
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
125 words
A failure warning device for an exhaust gas recirculation system for an internal combustion engine, the exhaust gas recirculation system having an exhaust gas recirculation conduit, an intake vacuum actuated metering valve to meter exhaust gas flow through the recirculation conduit, the metering valve having a diaphragm, one side of which communicates through a conduit with the engine intake system and the other side of which communicates with the atmosphere, said device comprising: an ignition switch which is closed when the internal combustion engine is operating; an alarm; a relay; and a detector to detect inoperability of said metering valve; said relay being actuated by said detector to energize said alarm in response to inoperability of said metering valve if said ignition switch is closed.
Claim 2
Dependent Claim
125 words
A failure warning device for an exhaust gas recirculation system for an internal combustion engine, the exhaust gas recirculation system having an exhaust gas recirculation conduit, an intake vacuum actuated metering valve to meter exhaust gas flow through the recirculation conduit, the metering valve having a diaphragm, one side of which communicates through a conduit with the engine intake system and the other side of which communicates with the atmosphere, said device comprising: an ignition switch which is closed when the internal combustion engine is operating; an alarm; a relay; and a detector to detect inoperability of said metering valve; said relay being actuated by said detector to energize said alarm in response to inoperability of said metering valve if said ignition switch is closed.
Claim 3
Dependent Claim
25 words
A device as claimed in claim 1, wherein said relay once actuated by said detector maintains said alarm energized until said ignition switch is opened.
Claim 4
Dependent Claim
65 words
A device as claimed in claim 2, wherein said detector is a valve opening sensing switch having a diaphragm, one side of which communicates with said conduit and the other side of which communicates with the intake system independently of said conduit, and a set of contacts which open and close in response to the position of said diaphragm of said valve opening sensing switch.
Claim 5
Dependent Claim
93 words
A device as claimed in claim 2, wherein said detector comprises first, second and third switches connected in series with one another, said first switch being an engine temperature sensing switch which is closed when the engine temperature exceeds a first predetermined value, said second switch being an intake vacuum sensing switch which is closed when the sensed intake system vacuum exceeds a second predetermined level, said third switch being a valve opening sensing switch which is closed when the degree of opening of said metering valve is below a third predetermined level.
Claim 6
Dependent Claim
57 words
A device as claimed in claim 4, wherein said intake vacuum sensing switch has a diaphragm, one side of which communicates with the conduit and the other side of which communicates with the atmosphere, and a set of contacts which open and close in response to the position of said diaphragm of said intake vacuum sensing switch.
Claim 7
Dependent Claim
64 words
A device as claimed in claim 4, wherein said intake vacuum sensing switch has a diaphragm, one side of which communicates with a spark advance vacuum port of the intake system and the other side of which communicates with the atmosphere, and a set of contacts which open and close in response to the position of said diaphragm of said throttle vacuum sensing switch.
Claim 8
Dependent Claim
95 words
A device as claimed in claim 2, wherein said detector has first, second and third switches connected in series with one another, said first switch being an engine temperature sensing switch which is closed when the engine temperature exceeds a first predetermined value, said second switch being an intake vacuum sensing switch which is closed when the sensed intake system vacuum exceeds a second predetermined value, said third sWitch being a temperature sensing switch which is closed when the temperature in the recirculation conduit downstream of the metering valve is below a fourth predetermined value.
Claim 9
Dependent Claim
22 words
A device as claimed in claim 1, wherein the detector actuates said relay to de-energize said alarm once said metering valve operates.
Claim 10
Dependent Claim
29 words
A device as claimed in claim 8, wherein the detector is a switch which closes when the opening degree of said metering valve is above a fifth predetermined value.
Claim 11
Dependent Claim
25 words
A device as claimed in claim 9, wherein the relay is a latching type relay which maintains said alarm de-energized once said metering valve operates.
References Cited (Backward Citations)
US3779222A
Cited
US3794006A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |