US3814224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel-supply control for automotive transmissions and the like
Assignee: ZF Friedrichshafen AG
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Filing: 1971-09-02
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Granted: 1974-06-04
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Expires: 1991-09-02
Abstract
Abstract A drive-establishing clutch or brake of an automotive power train, actuated hydraulically upon a shifting into gear, is connected to a pressure-responsive switch which, upon attainment of a predetermined degree of hydraulic loading, closes a circuit for temporarily restricting the fuel supply to a carburetor or injection nozzle. The throttling of the fuel supply is terminated either after a predetermined period, as measured by a timeconstant network, or upon full activation of the clutch or brake, as determined by a speed detector.
Inventors
- 👤 K Podssuweit
- 👤 W Felder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:49
CPC Classifications
F; F02; F02D; F02D1/00; F02D9/00; F02D2700/00; F02D2700/02; F02D2700/0217; F02D2700/0225; F02D2700/0228; F02D2700/023; F02D2700/0241; F02D2700/0269; F02D2700/0282; F02D2700/0284; F02D2700/0294
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
184 words
In a transmission system including a power train with hydraulically actuatable drive-establishing means for changing the speed ratio between an internal-combustion engine and a load interconnected by said power train, valve means for selectively admitting hydraulic fluid to said drive-establishing means, and fuel-supply means for said engine provided with rate-adjusting means, the combination therewith of: pressure-sensitive means coupled to said drive-establishing means and responsive to the degree of loading thereof by said hydraulic fluid; an operating element for said rate-adjusting means; a mechanical linkage connecting said rate-adjusting means with said operating element; control means inserted in said linkage for displacing said rateadjusting means independently of said operating element by altering the effective length of said linkage; and circuit means coupled to said pressure-sensitive means and to said control means for activating the latter to reduce the rate of fuel supply to said engine upon said degree of loading reaching a predetermined level, said circuit means including restoring means effective after a delay following such activation to deactivate said control means independently of said pressure-sensitive means, thereby re-establishing the original effective length of said linkage.
Claim 2
Dependent Claim
184 words
In a transmission system including a power train with hydraulically actuatable drive-establishing means for changing the speed ratio between an internal-combustion engine and a load interconnected by said power train, valve means for selectively admitting hydraulic fluid to said drive-establishing means, and fuel-supply means for said engine provided with rate-adjusting means, the combination therewith of: pressure-sensitive means coupled to said drive-establishing means and responsive to the degree of loading thereof by said hydraulic fluid; an operating element for said rate-adjusting means; a mechanical linkage connecting said rate-adjusting means with said operating element; control means inserted in said linkage for displacing said rateadjusting means independently of said operating element by altering the effective length of said linkage; and circuit means coupled to said pressure-sensitive means and to said control means for activating the latter to reduce the rate of fuel supply to said engine upon said degree of loading reaching a predetermined level, said circuit means including restoring means effective after a delay following such activation to deactivate said control means independently of said pressure-sensitive means, thereby re-establishing the original effective length of said linkage.
Claim 3
Dependent Claim
14 words
The combination defined in claim 1 wherein said control means comprises a hydraulic jack.
Claim 4
Dependent Claim
13 words
The combination defined in claim 1 wherein said control means comprises a solenoid.
Claim 5
Dependent Claim
14 words
The combination defined in claim 1 wherein said restoring means includes a time-constant network.
Claim 6
Dependent Claim
25 words
The combination defined in claim 4 wherein said circuit means includes a relay connected to be energized for a predetermined period measured by said network.
Claim 7
Dependent Claim
27 words
The combination defined in claim 1 wherein said restoring means includes a speed detector connected to a portion of said power train coupled to said drive-establishing means.
Claim 8
Dependent Claim
54 words
The combination defined in claim 6 wherein said drive-establishing means is a clutch with input and output shafts, said speed detector comprising a paid of signal generators respectively coupled to said shafts and a comparator connected to said signal generators for deactivating said control means in response to substantial equality of the generator outputs.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |