US3705571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot start auxiliary circuit for electronic fuel control system
Assignee: Bendix Corp
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Filing: 1971-03-17
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Granted: 1972-12-12
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Expires: 1991-03-17
Abstract
Abstract An auxiliary circuit for an electronic fuel control system to facilitate hot starting of the associated engine is disclosed herein. The circuit is responsive to engine temperature above a selected level and is operative to lengthen fuel injection control pulses by an amount calculated by the circuitry to be necessary to purge the injectors and the fuel supply conduits of any vapors forming as a result of excessive engine compartment temperatures. The circuit comprises a first means to generate a signal indicative of the temperature condition and a second means to translate this signal into an appropriate voltage for application to the main computing portion of the electronic fuel control system.
Inventors
- 👤 John W Horn
- 👤 Todd L Rachel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:45
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/06; F02D41/062; F02D41/065
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
In an electronic fuel control system having a main computing circuit for intermittently energizing at least one injector valve means for the provision of metered quantities of fuel, the improvement comprising: hot starting circuit means responsive to engine temperatures above a selected level indicative of hot soaking and coupled to the main computing circuit operative to lengthen the time period of energization of the injector valve means.
Claim 2
Dependent Claim
67 words
In an electronic fuel control system having a main computing circuit for intermittently energizing at least one injector valve means for the provision of metered quantities of fuel, the improvement comprising: hot starting circuit means responsive to engine temperatures above a selected level indicative of hot soaking and coupled to the main computing circuit operative to lengthen the time period of energization of the injector valve means.
Claim 3
Dependent Claim
59 words
The system as claimed in claim 1 wherein said hot starting circuit means comprises: control means responsive to engine temperatures operative to produce a signal having a magnitude representative of engine temperature above the selected level; and amplifier means responsive to said control means signal operative to produce an output signal having a magnitude representative of the desired lengthening.
Claim 4
Dependent Claim
20 words
The system as claimed in claim 2 wherein said control means and said amplifier means include solid state electronic devices.
Claim 5
Dependent Claim
45 words
The circuit as claimed in claim 3 wherein said control means includes a plurality of pn junctions between the base electrode of the solid state electronic device and the source of temperature and an equal number of pn junctions between the base electrode and ground.
Claim 6
Dependent Claim
135 words
A fuel control system for an internal combustion engine comprising: sensor means operative to provide information concerning the engine fuel requirements; computing means responsive to said sensor means information operative to produce an output signal having a variable characteristic representative of engine fuel requirements; injector valve means responsive to said variable characteristic operative upon energization to provide precise quantities of fuel for the engine; said sensor means including temperature sensor means operative to sense engine temperature; and a hot start circuit responsive to said temperature sensor operative to apply a variable strength signal to said computing means at temperatures above a selected level indicative of hot soaking to alter the variable characteristic of the computing means output signal to controllably enlarge the quantities of fuel being provided to the engine by said injector valve means.
Claim 7
Dependent Claim
135 words
A fuel control system for an internal combustion engine comprising: sensor means operative to provide information concerning the engine fuel requirements; computing means responsive to said sensor means information operative to produce an output signal having a variable characteristic representative of engine fuel requirements; injector valve means responsive to said variable characteristic operative upon energization to provide precise quantities of fuel for the engine; said sensor means including temperature sensor means operative to sense engine temperature; and a hot start circuit responsive to said temperature sensor operative to apply a variable strength signal to said computing means at temperatures above a selected level indicative of hot soaking to alter the variable characteristic of the computing means output signal to controllably enlarge the quantities of fuel being provided to the engine by said injector valve means.
Claim 8
Dependent Claim
64 words
The system as claimed in claim 5 wherein said computing means include first and second stages and said second stage computing means is responsive to said first stage computing means and at least one of said first and second stage computing means is responsive to said temperature sensor means and said hot start circuit is coupled to one of said first and second stages.
Claim 9
Dependent Claim
22 words
The system as claimed in claim 6 wherein said hot start circuit is coupled to the first stage of said computing means.
Claim 10
Dependent Claim
22 words
The system as claimed in claim 6 wherein said hot start circuit is coupled to the second stage of said computing means.
Claim 11
Dependent Claim
58 words
The system as claimed in claim 5 wherein said hot start circuit comprises: control means responsive to engine temperatures operative to produce a signal having a magnitude representative of engine temperature above the selected level; and amplifier means responsive to said control means signal operative to produce an output signal having a magnitude representative of the desired lengthening.
Claim 12
Dependent Claim
20 words
The system as claimed in claim 9 wherein said control means and said amplifier means include solid state electronic devices.
Claim 13
Dependent Claim
45 words
The circuit as claimed in claim 10 wherein said control means includes a plurality of pn junctions between the base electrode of the solid state electronic device and the source of temperature and an equal number of pn junctions between the base electrode and ground.
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) | 1975-12-12 | 1976-06-12 | 1976-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-12 | 1980-06-12 | 1980-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-12 | 1984-06-12 | 1984-12-12 | $7700.00 | Window Closed / Lapsed |