Patent US3792693A successfully refreshed from Google Patents.
US3792693A
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US
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Stored temperature cold start auxiliary system
Assignee: Bendix Corp
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Filing: 1971-09-10
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Granted: 1974-02-19
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Expires: 1991-09-10
Abstract
Abstract A cold start auxiliary circuit for use in conjunction with an electronically controlled fuel supply system is disclosed herein. The cold start auxiliary circuit is comprised of a first circuit which receives and stores a signal indicative of instantaneous engine temperature during the time period when the electrical system energization of the vehicle is substantially stable and a second circuit which is energized by the vehicle electrical system and is triggered upon the initiation of engine cranking but which is otherwise not influenced by the electrical energization fluctuation incident to the cranking cycle. The cold start circuit produces an output signal which is substantially proportional to the difference between the sensed engine temperature and an established reference upon triggering of the second circuit.
Inventors
- 👤 D Luchaco
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:55
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/06; F02D41/062; F02D41/064
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
158 words
In an internal combustion engine fuel control system having means for electronically injecting fuel into the engine, and an energizable electrical system with a three-position switch having OFF, RUN, and CRANK positions, the improvement comprising cold starting assist means for providing an injection signal having a duration determined by engine temperature comprising: temperature sensor means for providing a signal having a magnitude inversely proportional to engine temperature; means for receiving and storing the signal provided by said temperature sensor means; signal providing means responsive to the switch entering the CRANK position for initiating an injection output signal; means responsive to the initiation of an injection signal for discharging said signal storing means, the time required to reduce the stored signal to a predetermined level being determined by the magnitude of the signal received from said temperature sensor means; and level detecting means for terminating said output signal when said stored temperature indicating signal drops to a predetermined magnitude.
Claim 2
Dependent Claim
158 words
In an internal combustion engine fuel control system having means for electronically injecting fuel into the engine, and an energizable electrical system with a three-position switch having OFF, RUN, and CRANK positions, the improvement comprising cold starting assist means for providing an injection signal having a duration determined by engine temperature comprising: temperature sensor means for providing a signal having a magnitude inversely proportional to engine temperature; means for receiving and storing the signal provided by said temperature sensor means; signal providing means responsive to the switch entering the CRANK position for initiating an injection output signal; means responsive to the initiation of an injection signal for discharging said signal storing means, the time required to reduce the stored signal to a predetermined level being determined by the magnitude of the signal received from said temperature sensor means; and level detecting means for terminating said output signal when said stored temperature indicating signal drops to a predetermined magnitude.
Claim 3
Dependent Claim
92 words
The fuel control system as claimed in claim 1 wherein: the fuel control system includes voltage supply means subject to voltage fluctuations during engine start up that vary the magnitude of the temperature indicating signal provided by said temperature sensor means; and the cold starting assist means further include means responsive to the initiation of an output signal for isolating said signal storing means from said temperature sensor means during the time that an injection output signal is provided to thereby prevent voltage fluctuations from altering the duration of said output signal.
Claim 4
Dependent Claim
150 words
A circuit for generating an output pulse having a duration which is proportional to the difference between a sensed signal and an established reference for positive differences and which is zero for all other relationships, said signal to be generated in response to actuation of a control switch having at least two active positions comprising: a first circuit responsive to the sensed signal and to the switch being in the first position operative to receive and store the sensed signal; and a second circuit responsive to said first circuit and to the switch entering the second position operative to compare said stored sensed signal with a preselected reference signal and to generate an output signal having a starting point in time which coincides with entry of the switch into the second position and a duration proportional to the positive difference between the sensed stored signal and the preselected reference signal.
Claim 5
Dependent Claim
150 words
A circuit for generating an output pulse having a duration which is proportional to the difference between a sensed signal and an established reference for positive differences and which is zero for all other relationships, said signal to be generated in response to actuation of a control switch having at least two active positions comprising: a first circuit responsive to the sensed signal and to the switch being in the first position operative to receive and store the sensed signal; and a second circuit responsive to said first circuit and to the switch entering the second position operative to compare said stored sensed signal with a preselected reference signal and to generate an output signal having a starting point in time which coincides with entry of the switch into the second position and a duration proportional to the positive difference between the sensed stored signal and the preselected reference signal.
Claim 6
Dependent Claim
85 words
The circuit as claimed in claim 3 wherein said second circuit includes first and second serially connected bistable switches, said switches triggerable to switch from the nonconducting state to the conducting state and operative to thereafter remain in the conducting state until current flow through the switch decays below a predeterminable minimum, said first switch adapted to be triggered by entry of the control switch into the second position and the seconD switch is operative to compare the stored signal with the preselected reference signal.
Claim 7
Dependent Claim
60 words
The circuit as claimed in claim 4 including amplifier means having a control electrode, said control electrode coupled to the interconnection of said serially connected switches, said amplifier responsive to the conductive condition of the first switch to initiate an output control pulse and further responsive to the conductive condition of the second switch to terminate the output control pulse.
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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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |