US3715005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic cranking system for providing power assist upon vehicle engine stall
Assignee: Motors Liquidation Co
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Filing: 1971-09-01
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Granted: 1973-02-06
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Expires: 1991-09-01
Abstract
Abstract A system for energizing the vehicle engine starter motor when the vehicle engine stalls while the vehicle is at a speed greater than a predetermined minimum so as to maintain the operation of the vehicle engine driven accessories. A vehicle speed switch maintains the output of a summing junction, which output constitutes the input to a power switch, at ground so as to inhibit the power switch when the vehicle speed is below the predetermined speed and switches to supply a positive current signal to the summing junction at speeds equal to or greater than the predetermined speed. A vehicle engine speed tachometer supplies a negative current signal to the summing junction having a magnitude related to engine speed. The net current output of the summing junction when the vehicle engine speed is at or above the minimum engine idle speed, is insufficient to energize the power switch. When the engine speed decreases below the minimum idle speed, the net current output of the summing junction increases to energize the power switch which in turn energizes the vehicle starter solenoid. The vehicle starter motor cranks the vehicle engine so as to maintain the operation of the engine driven accessories while the vehicle speed is above the predetermined minimum speed.
Inventors
- 👤 R Byram
- 👤 M Culver
- 👤 Ostrom D Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:48
CPC Classifications
F; F02; F02N; F02N15/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
321 words
An apparatus for maintaining the operation of motor vehicle engine driven accessories when the vehicle engine stalls while the vehicle speed is above a predetermined minimum, the motor vehicle including a starter motor for cranking the vehicle engine, comprising vehicle speed tachometer means responsive to the speed of the vehicle for generating an output proportional to said speed; bistable switching means connected to the vehicle speed tachometer means and responsive to the output of the last-mentioned means for switching to a first state when the speed of the vehicle is at or above a predetermined minimum speed and switching to a second state when the speed of the vehicle is below the predetermined minimum speed; engine speed tachometer means responsive to the speed of the engine for generating an output signal representing the speed of the engine; circuit means connected to the bistable switching means and the engine tachometer means and responsive to the output state of the bistable switching means and the output signal of the engine tachometer means for generating an inhibiting signal independent of the output signal from the engine tachometer means when the bistable switching means is in the second state and for generating an output signal representing the speed of the engine when the bistable switching means is in the first state; and starter motor energizing means connected to the circuit means and the starter motor and responsive to the output signal of the circuit means for energizing the starter motor so as to crank the vehicle engine when the output signal of the circuit means represents a vehicle engine stall and for maintaining the starter motor deenergized at all vehicle engine speeds when the circuit means generates an inhibiting signal, whereby the vehicle engine is cranked by the starter motor when the vehicle engine has stalled while the vehicle is above the predetermined minimum speed for maintaining the operation of the vehicle engine driven accessories.
Claim 2
Independent Claim
321 words
An apparatus for maintaining the operation of motor vehicle engine driven accessories when the vehicle engine stalls while the vehicle speed is above a predetermined minimum, the motor vehicle including a starter motor for cranking the vehicle engine, comprising vehicle speed tachometer means responsive to the speed of the vehicle for generating an output proportional to said speed; bistable switching means connected to the vehicle speed tachometer means and responsive to the output of the last-mentioned means for switching to a first state when the speed of the vehicle is at or above a predetermined minimum speed and switching to a second state when the speed of the vehicle is below the predetermined minimum speed; engine speed tachometer means responsive to the speed of the engine for generating an output signal representing the speed of the engine; circuit means connected to the bistable switching means and the engine tachometer means and responsive to the output state of the bistable switching means and the output signal of the engine tachometer means for generating an inhibiting signal independent of the output signal from the engine tachometer means when the bistable switching means is in the second state and for generating an output signal representing the speed of the engine when the bistable switching means is in the first state; and starter motor energizing means connected to the circuit means and the starter motor and responsive to the output signal of the circuit means for energizing the starter motor so as to crank the vehicle engine when the output signal of the circuit means represents a vehicle engine stall and for maintaining the starter motor deenergized at all vehicle engine speeds when the circuit means generates an inhibiting signal, whereby the vehicle engine is cranked by the starter motor when the vehicle engine has stalled while the vehicle is above the predetermined minimum speed for maintaining the operation of the vehicle engine driven accessories.
Claim 3
Independent Claim
321 words
An apparatus for maintaining the operation of motor vehicle engine driven accessories when the vehicle engine stalls while the vehicle speed is above a predetermined minimum, the motor vehicle including a starter motor for cranking the vehicle engine, comprising vehicle speed tachometer means responsive to the speed of the vehicle for generating an output proportional to said speed; bistable switching means connected to the vehicle speed tachometer means and responsive to the output of the lastmentioned means for switching to a first state when the speed of the vehicle is at or above a predetermined minimum speed and switching to a second state when the speed of the vehicle is below the predetermined minimum speed; engine speed tachometer means responsive to the speed of the engine for generating an output signal representing the speed of the engine; circuit means connected to the bistable switching means and the engine tachometer means and responsive to the output state of the bistable switching means and the output signal of the engine tachometer means for generating an inhibiting signal independent of the output signal from the engine tachometer means when the bistable switching means is in the second state and for generating an output signal representing the speed of the engine when the bistable switching means is in the first state; and starter motor energizing means connected to the circuit means and the starter motor and responsive to the output signal of the circuit means for energizing the starter motor so as to crank the vehicle engine when the output signal of the circuit means represents a vehicle engine stall and for maintaining the starter motor deenergized at all vehicle engine speeds when the circuit means generates an inhibiting signal, whereby the vehicle engine is cranked by the starter motor when the vehicle engine has stalled while the vehicle is above the predetermined minimum speed for maintaining the operation of the vehicle engine driven accessories.
Claim 4
Independent Claim
321 words
An apparatus for maintaining the operation of motor vehicle engine driven accessories when the vehicle engine stalls while the vehicle speed is above a predetermined minimum, the motor vehicle including a starter motor for cranking the vehicle engine, comprising vehicle speed tachometer means responsive to the speed of the vehicle for generating an output proportional to said speed; bistable switching means connected to the vehicle speed tachometer means and responsive to the output of the lastmentioned means for switching to a first state when the speed of the vehicle is at or above a predetermined minimum speed and switching to a second state when the speed of the vehicle is below the predetermined minimum speed; engine speed tachometer means responsive to the speed of the engine for generating an output signal representing the speed of the engine; circuit means connected to the bistable switching means and the engine tachometer means and responsive to the output state of the bistable switching means and the output signal of the engine tachometer means for generating an inhibiting signal independent of the output signal from the engine tachometer means when the bistable switching means is in the second state and for generating an output signal representing the speed of the engine when the bistable switching means is in the first state; and starter motor energizing means connected to the circuit means and the starter motor and responsive to the output signal of the circuit means for energizing the starter motor so as to crank the vehicle engine when the output signal of the circuit means represents a vehicle engine stall and for maintaining the starter motor deenergized at all vehicle engine speeds when the circuit means generates an inhibiting signal, whereby the vehicle engine is cranked by the starter motor when the vehicle engine has stalled while the vehicle is above the predetermined minimum speed for maintaining the operation of the vehicle engine driven accessories.
References Cited (Backward Citations)
US2934054A
Cited
US3647016A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |