US3938486A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pneumatically controlled fuel injection system
Assignee: BorgWarner Automotive Electronic and Mechanical Systems Corp
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Filing: 1974-04-18
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Granted: 1976-02-17
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Expires: 1994-04-18
Abstract
Abstract A fuel system for an internal combustion engine employs fluid logic and amplifier devices for monitoring and processing pressures from both a venturi and inlet manifold to measure the air inducted into the engine and provides pneumatically controlled fuel injection in which fuel is metered in accordance with the air inducted into the engine by means of regulating the time duration of fuel injection.
Inventors
- 👤 Cecil D. Oglesby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:46
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/002; Y; Y10; Y10S; Y10S123/00; Y10S123/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
250 words
A pneumatically controlled fuel injection system for an internal combustion engine having air induction passages defining a venturi portion and a manifold portion, said system including, a pneumatic fluid source, a pneumatically actuated fuel injector connected to said pneumatic source and in fluid communication with a source of fuel and with said manifold portion of said engine, said injector being operable to admit fuel to said manifold portion in response to a pneumatic control pulse, a control device communicating with said pneumatic source and with said injector including means for initiating said control pulse in response to a trigger signal and for sustaining said control pulse for a time interval inversely proportional to a bias pressure, trigger signal generating means connected to said engine and communicating with said pneumatic source and with said control device providing a train of trigger signals having a frequency related to engine speed, and bias pressure generating means communicating with said pneumatic source and with said control device including; a first pneumatic circuit portion connected to receive a signal from said venturi portion and adapted to provide a first output signal indicative of fuel requirement, a second pneumatic circuit portion connected to receive a signal from said manifold portion and adapted to provide a second output signal indicative of fuel requirement, and comparator means connected to said first and second circuit portions and to said control device providing said bias pressure proportional to one of said first or second output signals indicative of fuel requirement.
Claim 2
Dependent Claim
250 words
A pneumatically controlled fuel injection system for an internal combustion engine having air induction passages defining a venturi portion and a manifold portion, said system including, a pneumatic fluid source, a pneumatically actuated fuel injector connected to said pneumatic source and in fluid communication with a source of fuel and with said manifold portion of said engine, said injector being operable to admit fuel to said manifold portion in response to a pneumatic control pulse, a control device communicating with said pneumatic source and with said injector including means for initiating said control pulse in response to a trigger signal and for sustaining said control pulse for a time interval inversely proportional to a bias pressure, trigger signal generating means connected to said engine and communicating with said pneumatic source and with said control device providing a train of trigger signals having a frequency related to engine speed, and bias pressure generating means communicating with said pneumatic source and with said control device including; a first pneumatic circuit portion connected to receive a signal from said venturi portion and adapted to provide a first output signal indicative of fuel requirement, a second pneumatic circuit portion connected to receive a signal from said manifold portion and adapted to provide a second output signal indicative of fuel requirement, and comparator means connected to said first and second circuit portions and to said control device providing said bias pressure proportional to one of said first or second output signals indicative of fuel requirement.
Claim 3
Dependent Claim
86 words
A pneumatically controlled fuel injection system according to claim 1, said first circuit portion including fluid logic means providing said first output signal in the form of a superambient pneumatic pressure, said second circuit portion including fluid amplifier means providing said second output signal in the form of a superambient pneumatic pressure, said comparator means providing said bias pressure proportional to said first output signal above a selected engine load and providing said bias pressure proportional to said second output signal below said selected engine load.
Claim 4
Dependent Claim
179 words
A pneumatically controlled fuel injection system according to claim 1, said first circuit portion including first fluid amplifier means connected to receive a subambient signal from said venturi portion, said first fluid amplifier means being biased for producing a superambient signal indicative of flow rate of air entering said induction passages, said first circuit portion further including fluid multivibrator means connected for receiving said flow rate signal and transforming said flow rate signal to a series of pulses indicative of the reciprocal of flow per revolution, and capacitance means connected to said multivibrator filtering said series of pulses to provide said first output signal in the form of a superambient pneumatic pressure proportional to the reciprocal of air flow inducted into said engine per revolution, said second circuit portion including second amplifier means connected to receive a subambient signal from said intake manifold portion of said induction passage, said second fluid amplifier means providing said second output signal in the form of a superambient pneumatic pressure proportional to the reciprocal of air flow inducted into said engine per revolution.
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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) | 1979-02-16 | 1979-08-18 | 1980-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-16 | 1983-08-18 | 1984-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-16 | 1987-08-18 | 1988-02-17 | $7700.00 | Window Closed / Lapsed |