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AssigneeConsiglio Nazionale Delle Ricerche
InventorsMariano Migliaccio, Emilio Pisani
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An air-fuel ratio control system for internal-combustion engines with controlled ignition and fed by a liquid fuel, supplied through a main pump and which during the operation is at least partially deviated into a re-cycle circuit and which, as the throttle valve controlling the intake pipe at least partially opens, is injected into said intake pipe to be mixed with the carburation air, wherein from the main pipe supplying the fuel three pipes are branched off, all ending into the inner chamber of a fluidistor, one of which supplying fuel at a constant delivery rate, the second pipe conveying fuel at a constant but adjustable delivery rate, and the third pipe conveying fuel at a variable delivery rate controlled by a pressure sensitive diaphragm valve in response to the resultant value of the subatmospheric pressure into the intake pipe sensed on the upstream and on the downstream side of the throttle valve, the fluidistor having two outlet pipes, the first of which is connected to a re-cycle reservoir and from the second pipe two pipes are branched off, the first of which ending with a fuel injection nozzle positioned on the upstream side of the throttle valve and the second being connected to a gauged injection nozzle for supplying the fuel required for the slow running, said pipes being each controlled by an electrovalve which normally is opened, but is shut under the control of a pressure transducer responsive to the vacuum degree in the inside of the fuel intake manifold of the engine cylinder on the downstream side of the throttle valve and which is designed to operate only when the vacuum degree into said manifold is below a predetermined minimum value.
An air-fuel ratio control system operating in response to the running conditions of an internal-combustion engine, having an intake pipe, with controlled ignition and fed by a liquid fuel, continuously supplied through a main pump from a main fuel source and which liquid fuel, during operation, is at least partially deviated into a recycle circuit connected to the main fuel source and, as the throttle valve controlling the intake pipe is at least partially opened, is injected into the intake pipe into which the carburation air is drawn from the atmosphere under the control of a manually operable shut-off valve, said air-fuel ratio control system comprising in combination, a supply pipe supplying the fuel from said main fuel source through said main pump;
Dependencies are inferred from the claim text.