US3771502A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circuit for providing electronic warm-up enrichment fuel compensation which is independent of intake manifold pressure in an electronic fuel control system
Assignee: Bendix Corp
•
Filing: 1972-01-20
•
Granted: 1973-11-13
•
Expires: 1992-01-20
Abstract
Abstract A circuit for recognizing and providing warm-up enrichment fuel compensation for an electronic fuel control system is described herein. The circuit is adapted to recognize and respond to an engine operating parameter indicative of engine operation at an engine temperature less than the normal operating temperature and to increase the duration of the fuel injection command pulse generated by the main electronic fuel control system. In those electronic fuel control systems which provide a fuel injection command pulse whenever a generated voltage wave shape is below a threshold value, the present invention contemplates altering the shape of the generated wave shape to delay its excursion through the threshold value.
Inventors
- 👤 J Reddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:11
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
An internal combustion engine fuel control system comprising: current source means; electrical storage means; first control means responsive to one engine operating parameter for providing a threshold signal; switching control means responsive to another engine operating parameter for switchingly connecting said current source means to said storage means to provide a timed series of variable level injection command signals; transistor means for controlling current flow from said current source means to said storage means; voltage level establishing means for supplying a normal operating bias voltage to said transistor control means; means responsive to engine temperature for providing a secondary bias voltage to the transistor means in response to engine temperature below a preselected level to reduce the rate at which current is supplied from said source means to said storage means and thereby increase the durations of said command signals; and fuel delivery means commanded only by said series of command signals for supplying fuel to the engine whenever a command signal has a predetermined relationship with respect to the value of said threshold signal.
Claim 2
Dependent Claim
175 words
An internal combustion engine fuel control system comprising: current source means; electrical storage means; first control means responsive to one engine operating parameter for providing a threshold signal; switching control means responsive to another engine operating parameter for switchingly connecting said current source means to said storage means to provide a timed series of variable level injection command signals; transistor means for controlling current flow from said current source means to said storage means; voltage level establishing means for supplying a normal operating bias voltage to said transistor control means; means responsive to engine temperature for providing a secondary bias voltage to the transistor means in response to engine temperature below a preselected level to reduce the rate at which current is supplied from said source means to said storage means and thereby increase the durations of said command signals; and fuel delivery means commanded only by said series of command signals for supplying fuel to the engine whenever a command signal has a predetermined relationship with respect to the value of said threshold signal.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |