US5107432A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for protection of automotive exhaust gas combustion devices
Assignee: Ferrari SpA
•
Filing: 1990-06-15
•
Granted: 1992-04-21
•
Expires: 2010-06-15
Abstract
Abstract A system for protecting the catalytic exhaust gas combustion devices of an automotive engine featuring two sets of cylinders, which system has, for each set of cylinders: a first sensor housed in the exhaust pipe downstream from the catalytic combustion device and designed to supply a first signal as a function of the temperature of the combustion device; a comparing block for supplying a second signal in response to the first signal reaching a threshold value indicating a predetermined temperature of the combustion device; and a central processing unit of an electronic fuel injection system, designed to cut off a fuel supply to the injectors of the aforementioned set of cylinders as a function of the aforementioned second signal.
Inventors
- 👤 Paolo Martinelli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:30
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1444; F02D41/1446; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F02D41/008; F02D41/0087; F01N2430/00; F01N2430/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
142 words
A system for the protection of automotive engine exhaust gas combustion devices comprising means for supplying a first signal as a function of the temperature of said combustion device, means for supplying a second signal in response to said first signal reaching a threshold value indicating a predetermined maximum temperature of said combustion device, means for supplying a fourth signal in response to detection of predetermined engine operative conditions; enabling means responsive to said second signal for outputting a third signal for cutting off said fuel supply in the presence of said fourth signal or enabling said time delay period in the absence of said fourth signal; and when said time delay period is enabled said enabling means outputting said third signal to said means for cutting off a fuel supply at the expiration of said delay time period of predetermined duration.
Claim 2
Independent Claim
142 words
A system for the protection of automotive engine exhaust gas combustion devices comprising means for supplying a first signal as a function of the temperature of said combustion device, means for supplying a second signal in response to said first signal reaching a threshold value indicating a predetermined maximum temperature of said combustion device, means for supplying a fourth signal in response to detection of predetermined engine operative conditions; enabling means responsive to said second signal for outputting a third signal for cutting off said fuel supply in the presence of said fourth signal or enabling said time delay period in the absence of said fourth signal; and when said time delay period is enabled said enabling means outputting said third signal to said means for cutting off a fuel supply at the expiration of said delay time period of predetermined duration.
Claim 3
Dependent Claim
24 words
A system as claimed in claim 1, wherein said means for supplying a second signal comprise threshold comparing means for supplying said second signal.
Claim 4
Dependent Claim
38 words
A system as claimed in claim 1, wherein said means for supplying a second signal comprise threshold comparing means for supplying, as a function of said first signal, at least a fifth signal for activating an indicating device.
Claim 5
Dependent Claim
38 words
A system as claimed in claim 1, wherein said means for cutting off a fuel supply and said means for supplying a fourth signal comprise means for controlling the length of time said fuel supply is cut off.
Claim 6
Dependent Claim
33 words
A system as claimed in claim 1, wherein said means for cutting off a fuel supply and said means for supplying a fourth signal form part of an electronic fuel injection control system.
Claim 7
Dependent Claim
51 words
A system as claimed in claim 1, wherein said means for supplying a fourth signal comprise means for detecting the speed of said engine, means for detecting the air intake by said engine and means for detecting the setting of a main throttle valve in the intake pipe of said engine.
Claim 8
Dependent Claim
31 words
A system as claimed in claim 1, wherein said means for supplying a first signal comprise a single temperature sensor housed in an exhaust pipe downstream from said catalytic combustion device.
Claim 9
Dependent Claim
46 words
A system as claimed in claim 1, wherein said engine comprises at least two sets of cylinders, said, means for supplying a first signal, said means for supplying a second signal and said means for cutting off a fuel supply being operatively coupled to each set.
Claim 10
Dependent Claim
34 words
A system as claimed in claim 3, wherein said means for supplying a second signal outputs said fifth signal at a temperature of said combustion device which is lower than said predetermined maximum temperature.
References Cited (Backward Citations)
US3955363A
Cited
US4024850A
Cited
US4015428A
Cited
US4233811A
Cited
US4379387A
Cited
US4319451A
Cited
US4348728A
Cited
US4484548A
Cited
US4450814A
Cited
US4729220A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-04-21 | 1995-10-21 | 1996-04-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-04-21 | 1999-10-21 | 2000-04-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-04-21 | 2003-10-21 | 2004-04-21 | $7700.00 | Window Closed / Lapsed |