US3576182A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion engine fuel injection apparatus having fluidic control means
Assignee: Bendix Corp
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Filing: 1969-07-09
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Granted: 1971-04-27
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Expires: 1989-07-09
Abstract
Abstract Fuel injection apparatus for a multicylinder reciprocating engine having a separate fuel injection nozzle connected to supply each cylinder wherein each fuel injection nozzle is supplied an automatically controlled flow of pressurized fuel in response to exhaust gas temperature of the cylinder associated therewith independently of the remaining cylinders by an associated pure fluid amplifier control network to establish optimum fuel-air ration for each cylinder. The pure fluid amplifier control network for each cylinder includes a fixed frequency oscillating fluid amplifier and a bistable fluid amplifier slaved thereto which produces a corresponding fixed frequency pressure pulse output at each of two output ports thereof. One of the two output ports is connected, via passage means exposed to cylinder exhaust gas temperature, to a control input port of a monostable amplifier and the other output port is vented to an opposing control input port thereof such that the phase relationship of the opposing pressure pulses to the control input ports varies as a function of the cylinder exhaust gas temperature. The resulting output pressure derived from the monostable amplifier is applied to a fuel-powered proportional fluid amplifier which proportions fuel flow to the cylinder accordingly.
Inventors
- 👤 George R Howland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:57
CPC Classifications
F; F15; F15C; F15C1/00; F15C1/002; Y; Y10; Y10S; Y10S261/00; Y10S261/69
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
128 words
Fuel control apparatus for a multicylinder reciprocating engine having an inlet pipe for conducting a fuel-air mixture to each cylinder and an exhaust pipe for conducting exhaust gas from each cylinder, said fuel control apparatus comprising: a plurality of pure fluid amplifier means each of which is connected to an associated one of the engine cylinders and responsive to a variable condition of the exhaust gas of said one cylinder for generating a fluid pressure signal which varies as a function of said exhaust gas condition; and fuel control means operatively connected to supply fuel to the inlet pipe of said one cylinder and responsive to said fluid pressure signal for controlling fuel flow to and thus fuel-air ratio of said one cylinder independently of the remaining cylinders.
Claim 2
Dependent Claim
128 words
Fuel control apparatus for a multicylinder reciprocating engine having an inlet pipe for conducting a fuel-air mixture to each cylinder and an exhaust pipe for conducting exhaust gas from each cylinder, said fuel control apparatus comprising: a plurality of pure fluid amplifier means each of which is connected to an associated one of the engine cylinders and responsive to a variable condition of the exhaust gas of said one cylinder for generating a fluid pressure signal which varies as a function of said exhaust gas condition; and fuel control means operatively connected to supply fuel to the inlet pipe of said one cylinder and responsive to said fluid pressure signal for controlling fuel flow to and thus fuel-air ratio of said one cylinder independently of the remaining cylinders.
Claim 3
Dependent Claim
17 words
Fuel control apparatus as claimed in claim 1 wherein: said exhaust gas condition is exhaust gas temperature.
Claim 4
Dependent Claim
62 words
Fuel control apparatus as claimed in claim 2 wherein the inlet pipe to each cylinder is connected to a controllable air supply; and wherein each of said plurality of pure fluid amplifier means is further responsive to supply air temperature and operative to generate a fluid pressure signal which varies as a function of cylinder exhaust gas temperature and supply air temperature.
Claim 5
Dependent Claim
216 words
Fuel control apparatus as claimed in claim 3 wherein: each of said pure fluid amplifier means includes; first fluidic amplifier means operative to generate first and second series of fluid pressure pulses having a common frequency; second fluidic amplifier means; first conduit means connected to transmit said first series of pressure pulses from said first amplifier means to said second amplifier means; second conduit means having a portion of the length thereof exposed to the exhaust gas flow through the exhaust pipe of said one cylinder and connected to transmit said second series of pressure pulses from said first amplifier means to said second amplifier means; said second amplifier means being responsive to said first and second series of pressure pulses and operative to generate said fluid pressure signal which varies in response to the phase shift between said first and second series of pressure pulses as a function of said cylinder exhaust gas temperature; means for generating a reference fluid pressure corresponding to a predetermined desired cylinder exhaust gas temperature; said fuel control means is connected to respond to said fluid pressure signal which varies as a function of cylinder exhaust gas temperature and said reference fluid pressure for controlling fuel flow in response to an error between actual and desired cylinder exhaust gas temperatures.
Claim 6
Dependent Claim
104 words
Fuel control apparatus as claimed in claim 4 wherein: said first conduit means is exposed to supply air temperature; said second conduit having said portion of its length exposed to cylinder exhaust gas temperature and the remaining portion of the length thereof exposed to supply air temperature; said first conduit means and said portion of said second conduit means exposed to supply air temperature being of equal length; said fluid pressure signal derived from said second amplifier means being defined by a series of fluid pressure pulses having a pulse duration proportional to the ratio of cylinder exhaust gas temperature and supply air temperature.
Claim 7
Dependent Claim
182 words
Fuel control apparatus as claimed in claim 4 wherein: said first fluidic amplifier means includes an oscillator fluidic amplifier having a power air jet and firSt and second output passages and control means for deflecting said power air jet to alternately pressurize said first and second output passages; a bistable fluidic amplifier having a power air jet and third and fourth output passages and responsive to said first and second series of pressure pulses which deflect the power air jet thereof to alternately pressurize said third and fourth output passages thereby generating said first and second series of pressure pulses, respectively; said second fluidic amplifier means includes a monostable fluidic amplifier having a power air jet and fifth and sixth output passages and responsive to said first and second series of pressure pulses for deflecting said power jet thereof from a stable position whereby said power air jet is directed to said fifth output passage to a nonstable position whereby said power air jet is directed to said sixth output passage; said fluid pressure signal being derived from said sixth output passage.
Claim 8
Dependent Claim
38 words
Fuel control apparatus as claimed in claim 6 and further including: air flow restricting means operatively connected to said sixth output passage for attentuating pressure pulses in said fluid pressure signal to provide a substantially constant fluid pressure.
Claim 9
Dependent Claim
70 words
Fuel control apparatus as claimed in claim 4 wherein: said reference fluid pressure is derived from a first passage connecting a first source of pressurized air with a second source of air at relatively lower pressure and provided with first and second air flow restrictions in series flow relationship therein; said reference fluid pressure being generated intermediate said first and second restrictions and varying depending upon the area ratio thereof.
Claim 10
Dependent Claim
69 words
Fuel control apparatus as claimed in claim 8 and further including: a second passage connected to said first passage in parallel flow relationship with said first restriction; valve means in said second passage for varying the effective flow area thereof to vary the effective flow area ratio relationship between said first and second restrictions and thus said reference fluid pressure accordingly; and control means for actuating said valve means.
Claim 11
Dependent Claim
110 words
Fuel control apparatus as claimed in claim 1 and further including: control means for generating a reference fluid pressure corresponding to a predetermined desired value of said variable condition of exhaust gas operatively connected to said fuel control means to impose said reference fluid pressure thereon; said fuel control means being responsive to the relative error between said fluid pressure signal and said reference fluid pressure thereon; said fuel control means being responsive to the relative error between said fluid pressure signal and said reference fluid pressure for controlling fuel flow to said one cylinder to maintain said variable condition of exhaust gas substantially constant at said predetermined desired value.
Claim 12
Dependent Claim
49 words
Fuel control apparatus as claimed in claim 10 and further including: second control means responsive to a variable condition of engine operation and operatively connected to said fuel control means for temporarily modifying said reference fluid pressure in response to a predetermined variation in said condition of engine operation.
Claim 13
Dependent Claim
153 words
Fuel control apparatus as claimed in claim 3 wherein said controllable air supply includes an air manifold having a positionable air throttle valve operatively connected thereto and said fuel control apparatus further includes: first control means for generating a reference fluid pressure corresponding to a predetermined desired value of said exhaust gas temperature and operatively connected to said fuel control means for imposing said reference fluid pressure thereon; said fuel control means being responsive to the relative error between said fluid pressure signal and said reference fluid pressure for controlling fuel flow to said one cylinder to maintain said exhaust gas temperature substantiallY constant at said predetermined desired value; and second control means responsive to the manifold air pressure and operatively connected to said fuel control means for temporarily modifying said reference fluid pressure in response to the rate of change of manifold air pressure caused by movement of said air throttle valve.
References Cited (Backward Citations)
US2244669A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |