US3761729A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Arrangement for preventing excessive speeds in internal combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1971-12-16
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Granted: 1973-09-25
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Expires: 1991-12-16
Abstract
Abstract An AC tachometer has two output windings, each connected to one input of the same bistable circuit. A rectifier and filter circuit or a Zener diode is interconnected between each output winding and bistable circuit input. When the voltage at the bistable inputs exceeds a predetermined magnitude, the bistable input flips to the second stable state. A signal resulting from the change in state can be used to cut off fuel supply to stop the engine.
Inventors
- 👤 G Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:14
CPC Classifications
F; F02; F02D; F02D31/00; F02D31/001; F02D31/007; F02D31/009; F02D17/00; F02D17/04; F02D41/00; F02D41/02; F02D41/0205
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
143 words
In an internal combustion engine, an arrangement for furnishing an output signal when the speed of said engine exceeds a predetermined speed, comprising, in combination, tachometer means having a first and second output winding, each of said windings furnishing a speed signal corresponding to the speed of said internal combustion engine; bistable circuit means having a first and second input respectively connected to said first and second output winding of said tachometer means, said bistable circuit means having a first stable state in the presence of speed signals signifying an engine speed less than said predetermined speed, and switching to a second stable state in response to speed signals corresponding to an engine speed exceeding said predetermined speed; and output means connected to said bistable circuit means to furnish said output signal when said bistable circuit means is in said second stable state.
Claim 2
Dependent Claim
143 words
In an internal combustion engine, an arrangement for furnishing an output signal when the speed of said engine exceeds a predetermined speed, comprising, in combination, tachometer means having a first and second output winding, each of said windings furnishing a speed signal corresponding to the speed of said internal combustion engine; bistable circuit means having a first and second input respectively connected to said first and second output winding of said tachometer means, said bistable circuit means having a first stable state in the presence of speed signals signifying an engine speed less than said predetermined speed, and switching to a second stable state in response to speed signals corresponding to an engine speed exceeding said predetermined speed; and output means connected to said bistable circuit means to furnish said output signal when said bistable circuit means is in said second stable state.
Claim 3
Dependent Claim
16 words
An arrangement as set forth in claim 1, wherein said tachometer means comprise A.C. generator means.
Claim 4
Dependent Claim
85 words
An arrangement as set forth in claim 2, further compRising first diode means interconnected between said first output winding of said tachometer means and said first input of said bistable circuit means; and second diode means interconnected between said second output winding of said tachometer means and said second input of said bistable circuit means in such a manner that the polarity of each of said diode means permits current flow in a direction for switching said bistable circuit means to said second stable state.
Claim 5
Dependent Claim
84 words
An arrangement as set forth in claim 1, wherein said bistable circuit means comprise first transistor means conductive when said bistable circuit means is in said first stable state and second transistor means conductive when said bistable circuit means is in said second stable state; further comprising base bias circuit means connected to said first transistor means and to said first output winding, for furnishing base bias for said first transistor means in dependence on the speed signal furnished by said first output winding.
Claim 6
Dependent Claim
30 words
An arrangement as set forth in claim 1, wherein said output means comprise an output terminal furnishing said output signal when said bistable circuit means is in said second state.
References Cited (Backward Citations)
US3636933A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |