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Patent US4705004A successfully refreshed from Google Patents.
US4705004A
Expired / Lapsed
US
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Fuel injection control system for internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1986-09-11
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Granted: 1987-11-10
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Expires: 2006-09-11
Abstract
Abstract A fuel injection control system for an internal combustion engine including: a cold start injection valve provided inside an intake pipe for performing fuel injection on cold starts; a switch for controlling energization of the cold start injection valve; a starter drive state detector for judging if a starter is being driven; a clock for detecting, by the starter drive state detector, a change of the starter from a nonoperating state to an operating state and for counting time elapsed from the detected change; and start controller which designates a starting fuel injection when the elapsed time counted by the clock is a first predetermined period or more and which prohibits the starting fuel injection when the elapsed time is a second predetermined period or more greater than the first predetermined period.
Inventors
- 👤 Hiroshi Takahashi
- 👤 Masanobu Tamura
- 👤 Kunihiko Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:44
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/06; F02D41/061; F02M; F02M69/00; F02M69/30; F02M69/34
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
139 words
A fuel injection control system for an internal combustion engine comprising: a cold start injection valve provided inside an intake pipe for performing fuel injection on cold starts; a switch means for controlling energization of the cold start injection valve; a starter drive state detection means for judging if a starter is being driven; a clock means for detecting, by the starter drive state detection means, a change of the starter from a nonoperating state to an operating state and for counting time elapsed from said detected change; and a start control means which designates a starting fuel injection when the elapsed time counted by the clock means is a first predetermined period or more and which prohibits the starting fuel injection when the elapsed time is a second predetermined period or more greater than the first predetermined period.
Claim 2
Dependent Claim
139 words
A fuel injection control system for an internal combustion engine comprising: a cold start injection valve provided inside an intake pipe for performing fuel injection on cold starts; a switch means for controlling energization of the cold start injection valve; a starter drive state detection means for judging if a starter is being driven; a clock means for detecting, by the starter drive state detection means, a change of the starter from a nonoperating state to an operating state and for counting time elapsed from said detected change; and a start control means which designates a starting fuel injection when the elapsed time counted by the clock means is a first predetermined period or more and which prohibits the starting fuel injection when the elapsed time is a second predetermined period or more greater than the first predetermined period.
Claim 3
Dependent Claim
47 words
A fuel injection control system as claimed in claim 1, wherein said switch means includes a first control switch of a bimetal type whose contacts open and close through heat generated from a heat coil and a second control switch whose contacts open and close through energization.
Claim 4
Dependent Claim
25 words
A fuel injection control system as claimed in claim 1, wherein said switch means comprises just a switch whose contacts open and close through energization.
Claim 5
Dependent Claim
17 words
A fuel injection control system as claimed in claim 1, wherein said clock means includes a counter.
Claim 6
Dependent Claim
30 words
A fuel injection control system as claimed in claim 1, wherein said start control means includes an engine cooling water temperature detection means and an engine rotational speed detection means.
Claim 7
Dependent Claim
28 words
A fuel injection control system as claimed in claim 1, wherein said start control means includes an elapsed time detection means and an engine rotational speed detection means.
Claim 8
Dependent Claim
25 words
A fuel injection control system as claimed in claim 1, wherein said start control means includes a delay circuit comprised of a resistor and capacitor.
Claim 9
Dependent Claim
122 words
A fuel injection control method for controlling fuel injection timing of a cold start injection valve of an internal combustion engine, characterized by: providing a control switch for controlling operation of said cold start injection valve and a control means for controlling an ON/OFF state of the control switch; based on commands of said control means, turning said control switch on after the elapse of a first predetermined time from when a starter switch is turned on so as to open said cold start injection valve and start the fuel injection; and turning said control switch off after a second predetermined time greater than said first predetermined time so as to close said cold start injection valve and stop the fuel injection.
Claim 10
Dependent Claim
122 words
A fuel injection control method for controlling fuel injection timing of a cold start injection valve of an internal combustion engine, characterized by: providing a control switch for controlling operation of said cold start injection valve and a control means for controlling an ON/OFF state of the control switch; based on commands of said control means, turning said control switch on after the elapse of a first predetermined time from when a starter switch is turned on so as to open said cold start injection valve and start the fuel injection; and turning said control switch off after a second predetermined time greater than said first predetermined time so as to close said cold start injection valve and stop the fuel injection.
Claim 11
Dependent Claim
93 words
A fuel injection control method for controlling a fuel injection timing of a cold start injection valve of an internal combustion engine, characterized by: providing a control switch for controlling operation of said cold start injection valve and a control means for controlling an ON/OFF state of the control switch and based on commands of said control means, turning said control switch on after the elapse of a first predetermined time from when a starter switch is turned on so as to open said cold start injection valve and start the fuel injection.
Claim 12
Dependent Claim
93 words
A fuel injection control method for controlling a fuel injection timing of a cold start injection valve of an internal combustion engine, characterized by: providing a control switch for controlling operation of said cold start injection valve and a control means for controlling an ON/OFF state of the control switch and based on commands of said control means, turning said control switch on after the elapse of a first predetermined time from when a starter switch is turned on so as to open said cold start injection valve and start the fuel injection.
Claim 13
Dependent Claim
58 words
A fuel injection control method as claimed in claim 8 or 9, wherein said control means includes a starter drive state detection means for detecting a drive state of a starter, an elapsed time detection means for detecting the ON time of a starter switch, and an engine rotational speed detection means for detecting the engine rotational speed.
Claim 14
Dependent Claim
58 words
A fuel injection control method as claimed in claim 8 or 9, wherein said control means includes a starter drive state detection means for detecting a drive state of a starter, an engine cooling water temperature detection means for detecting the engine cooling water temperature, and an engine rotational speed detection means for detecting the engine rotational speed.
Claim 15
Dependent Claim
33 words
A fuel injection control method as claimed in claim 8 or 9, wherein said control switch includes a first control switch having a bimetal and a second control switch using a solenoid coil.
Claim 16
Dependent Claim
25 words
A fuel injection control method as claimed in claim 8 or 9, wherein said control switch includes just a control switch using a solenoid coil.
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) | 1990-11-09 | 1991-05-11 | 1991-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-11-09 | 1995-05-11 | 1995-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-11-09 | 1999-05-11 | 1999-11-10 | $7700.00 | Window Closed / Lapsed |