US4092961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carburetion system for preventing engine misfires during gear changes
Assignee: Toyota Motor Corp
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Filing: 1977-05-31
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Granted: 1978-06-06
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Expires: 1997-05-31
Abstract
Abstract A carburetion system is disclosed for preventing misfires of an engine during gear changes. The system includes a carburetor idle port and, additionally, an idle and slow port positioned near the throttle valve. Both ports are in communication with a idle and slow fuel passage. A valve controls the entry of air into the slow fuel passage during gear changes. The valve is opened by a circuit which functions to detect the concurrence of (1) the pushed-down position of the clutch pedal, and (2) the idle opening position of the throttle valve. A timing device is included for closing the valve a predetermined period of time after the clutch has been pushed down and the throttle valve has assumed its idle opening position.
Inventors
- 👤 Minoru Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:02
CPC Classifications
F; F02; F02M; F02M3/00; F02M3/08; F02M3/09
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
A carburetion system for use in an internal combustion engine of a vehicle comprising: an intake passage for said engine; a throttle valve located in said intake passage; an idle port open in said intake passage; means for providing a first signal when a clutch pedal of said vehicle is depressed; means for providing a second signal when said throttle valve is at an idle opening position; a coincidence detecting circuit for detecting the simultaneous occurrence of said first and second signals and providing an output signal when coincidence is detected, said output signal representing a gear changing condition; a fuel passage for directing fuel to said idle port; valve means for opening a communication path between the atmosphere and said fuel passage in response to said output signal, whereby air is introduced into said fuel passage at the time of changing gears; and timing means for closing said valve means a predetermined period of time after said coincidence detecting circuit provides said output.
Claim 2
Dependent Claim
164 words
A carburetion system for use in an internal combustion engine of a vehicle comprising: an intake passage for said engine; a throttle valve located in said intake passage; an idle port open in said intake passage; means for providing a first signal when a clutch pedal of said vehicle is depressed; means for providing a second signal when said throttle valve is at an idle opening position; a coincidence detecting circuit for detecting the simultaneous occurrence of said first and second signals and providing an output signal when coincidence is detected, said output signal representing a gear changing condition; a fuel passage for directing fuel to said idle port; valve means for opening a communication path between the atmosphere and said fuel passage in response to said output signal, whereby air is introduced into said fuel passage at the time of changing gears; and timing means for closing said valve means a predetermined period of time after said coincidence detecting circuit provides said output.
Claim 3
Dependent Claim
51 words
The carburetion system of claim 1 wherein one of said signals is generated by a first switch responsive to movement of said clutch pedal, and the other signal is generated by a second switch responsive to movement of an accelerator pedal, said accelerator pedal moving in conjunction with said throttle valve.
Claim 4
Dependent Claim
35 words
The carburetion system of claim 2 wherein said first and second switches are limit switches which are responsive to detect the movement of said clutch pedal and said accelerator pedal from respective predetermined rest positions.
Claim 5
Dependent Claim
15 words
The carburetion system of claim 1 wherein said coincidence detecting circuit comprises an AND circuit.
Claim 6
Dependent Claim
19 words
The carburetion system of claim 1 wherein said timing means comprises a timer circuit connected to a drive circuit.
Claim 7
Dependent Claim
14 words
The carburetion system of claim 1 wherein said valve means comprises an electromagnetic valve.
Claim 8
Dependent Claim
41 words
The carburetion system of claim 1 further comprising a slow port communicating with said fuel passage and positioned such that it may be downstream or upstream of an edge of said throttle valve depending on the opening of said throttle valve.
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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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |