Abstract: A system for automatic control of the fuel mixture strength supplied in slow-running conditions to a heat engine having a fuel injection system and means for supplying supplementary air in adjustable quantities, comprising first means for periodically varying the quantity of supplementary air supplied to the engine and for detecting the consequent variation in the slow running of the engine for the purpose of obtaining activation for second means for modification of the quantity of fuel supplied to the injectors of the system for compensating the variation in the strength of the mixture.

Abstract: A system for correction of the fuel injection time control upon variation in altitude, for a heat engine having an electronic fuel injection system, and having means for substantially detecting the value of the external atmospheric pressure and the consequently correcting the value of induction air pressure utilized by a central processing unit of the injection system for calculating the injection time.

Abstract: A system for stroke identification of an internal combustion engine, comprising first sensor means for detecting given angles of a drive shaft; second sensor means for detecting given angles of a distributor shaft; third processing means for receiving signals from the first and second sensor means and for identifying the strokes on the engine; and on which the aforementioned second sensor means comprise a single sensor element.

Abstract: The device comprises an electromagnetically operated fuel atomisation and metering valve housed in a seat in a body of the device, and a pressure regulator for regulating the pressure of the fuel in a region upstream of the valve; this regulator includes a deformable diaphragm connected to a shutter member operable to control a fuel passage opening between the said upstream region and a discharge; the body of the device includes a support plate for the deformable diaphragm, which is made integrally with the body itself, and the diaphragm is fixed to this latter by means of a bell-shape element defining a chamber closed by the diaphragm and in hydraulic communication with a region downstream of the valve.

Abstract: The device substantially comprises an upper body in which is formed a first perforation in communication with an air intake opening and delimited by a first conical surface and a support element for a fuel atomisation and metering valve having a tubular form and connected to the first conical surface by means of a pair of ribs disposed substantially in the plane which contains the axis of the first conical surface. The device further includes a lower body in which is formed a second perforation delimited by a second conical surface coaxial with the first and which is in communication with a mixture supply opening, the cone angle of the second conical surface being greater than that of the first conical surface.

Abstract: A system for automatically defining the minimum setting of a valve controlled by an accelerator for supplying air to an internal combustion engine, which system comprises means for repeatedly detecting the setting of the valve in relation to a given minimum setting value; which means define a new given minimum setting value, should the setting of the valve remain steadily, in excess of given time limits, within setting limits respectively over and below the aforementioned given minimum setting value.

Abstract: A system for limiting the maximum speed of an internal combustion engine comprising an electronic injection system, which system comprises first means for detecting when the speed of the engine exceeds a first given threshold value, and for consequently disabling fuel supply to the injectors, and second means for determining whether the speed of the engine exceeds a second given threshold value higher than the first threshold value, and for consequently maintaining disabled or enabling fuel supply.

Abstract: A starting fuel supply system for an internal combustion engine, comprising an electronic injection system, and processing means which, prior to stroke identification of the engine, cause fuel to be supplied to more than one injector, including the injector relative to the cylinder first reaching the ignition point subsequent to such identification, and which has already completed the induction stroke, thus enabling substantially total intake of the fuel injected into the cylinder.

Abstract: A control system for at least one fuel injector in an electronic fuel injection system for a heat engine in which the injector has a linear operating time range defined by a minimum opening time (MIT) and a minimum rest time (MIOT). The system includes a first processor for determining a theoretical injector opening time (TJ), and a second processor directing asynchronous opening of the injector with respect to the phase of the engine, subject to the criteria that the minimum opening and rest times are maintained, while the same linear proportion between the opening and closing time of the injector is also maintained, to ensure that the operating time does not exceed this linear range.

Abstract: A fuel metering valve comprises a valving member mobile axially within a casing and operated by an electromagnet, with said valving member there being rigid an armature arranged for attraction by the core of the electromagnet, and an annular stop member being provided to act as a stop for said valving member and being interposed between a shoulder of said casing and the front surface of a nosepiece rigid with said casing and arranged to house said valving member; the stop member is provided, on that side facing said nosepiece, with at least two different flat surfaces, of which a first surface is arranged to form a stop for said valving member and a second surface is arranged to form a shoulder for said front surface of the nosepiece, said first and second surfaces being positioned each at a different distance from said casing shoulder.

Abstract: A valve comprising a cap fitted to the valve casing and in which is formed a fuel circuit terminating inside an injection outlet, and a plug sliding axially inside a seat on the cap between a first position, wherein the plug closes the injection outlet, and a second position, wherein the oulet is open; the plug being activated by an electromagnetic inside the casing, and guiding means being provided for guiding the plug inside the seat on the cap; the fuel circuit comprising a series of holes formed inside the cap and arranged about the aforementioned seat, and an annular chamber formed inside the cap and communicating hydraulically with the aforementioned holes and with the injection outlet; the axis of each of the aforementioned holes forming an angle converging with the axial seat.

Abstract: A system for automatically controlling the idling speed of an internal combustion engine, comprising a valve, for supplying an adjustable quantity of additional air, and means for controlling the setting of the valve as a function of the detected speed of the engine and comparison with an idling speed range, and as a function of the detected pressure in the intake manifold and comparison with a value equivalent to the required air supply.

Abstract: Fuel injection apparatus for diesel engines includes an injection pump connected to an injector nozzle through a control device constituted by two calibrated and opposed non-return valves arranged to keep a residual pressure of a predetermined magnitude in the fuel supply passage to the injector between each injection cycle and the next. The two non-return valves are located downstream of the output of the pump and are preferably inserted in a body fixed to or forming part of the injector, or forming part of the delivery union of the pump.

Abstract: A fuel injection pump for diesel engines, in which the pressure chamber of each cylinder (10) is defined on its side opposite the piston (16) by a slide valve (38) movable in a direction opposite the piston against the action of resilient biasing means (52). The slide valve is sensitive to the supply pressure of the fuel and controls communication between the pressure chamber and the fuel delivery passage (44, 46). The supply pressure is controlled by external modulating means which varies the equilibrium position of the slide valve. The slide valve allows the initial alteration of the effective delivery, and hence the effective injection advance, in dependence on the running conditions/load of the engine.

Abstract: A constant-pressure delivery valve for fuel injection pumps for diesel engines includes a conical-surface obturator to which is fixed a body forming an axial chamber containing a calibrated one-way valve with a ball obturator. The ball obturator is located on that side of the chamber facing the conical-surface obturator and controls communication between radial and axial fuel return passages formed beneath the bottom of the chamber.

Abstract: A valve includes an air inlet for air coming from a first part of an engine intake passage, which is positioned upstream of a throttle valve and an air outlet for air moving toward a second part of the intake passage which is positioned downstream of the throttle valve. A hollow tubular element is connected to the air inlet and has primary connecting orifices between the air inlet and the air outlet. A movable obturator is housed within the tubular element. A magnetic core and winding is energized by an electrical control unit to generate a magnetic field to move a conical edge of the obturator to selectively open the primary connecting orifices to obtain laminar air flow across the primary connecting orifices, with this laminar air flow being directly proportional to the air passage section provided by the opened primary connecting orifices.

Abstract: A carburetor is provided which has a main barrel in which there is a throttle which turns integrally with a shaft. An idle system opens into the main barrel through three holes; and a lever is splined to the shaft and connected to the accelerator to open the throttle against the action of a spring. Stop devices operate on the lever to define a first position of the throttle for which the holes are upstream. A second lever is idle mounted on the shaft. This second lever uses pushers and operates against the action of a rod positioned by a rotating cam with an electromagnetic element, or electronic gear box to rotate the first lever. This second lever defines, when the accelerator is released, small opening positions of the throttle differing from the first position. A microprocessor gearbox processes the signals expressing the functioning conditions of the engine to operate the electromagnetic element or electronic gear box.

Abstract: A device for controlling the throttle position of a carburetor during an accelerator release stage, in accordance with the speed of the engine. The device includes a vacuum motor which acts on a control lever associated with the carburetor throttle and which is in fluid communication with the intake suction manifold of the engine and with the atmosphere. An electromagnet device is energized by a control device which receives signals representing various engine parameters as detected by sensing devices. The electromagnet device includes a movable keeper including a bushing which slides between a pair of abutments under the effect of the magnetic field created by the electromagnets of the electromagnet device and of a spring which opposes the force applied by the magnetic field. The bushing includes a valve member which controls a pipe in order to place the vacuum motor in communication with the atmosphere.

Abstract: A carburetor is provided which includes a sensor mounted in the engine head for monitoring cooling water temperature, and sensors for monitoring engine RPM and intake manifold absolute pressure. A first positioning unit positions the throttle valve, prior to depression of the accelerator, in a plurality of angular positions as a function of the cooling water temperature. A second positioning unit positions the choke valve as a function of the cooling water temperature to limit the amount of opening of the choke valve caused by air sucked into the carburetor by the engine. The second positioning unit has a spring for biasing the choke valve to close the choke valve to prevent swinging of the choke valve when the engine is turned off. A central processing unit receives signals from the first, second and third sensors to control the first and second positioning units to position the throttle valve and the choke valve respectively.

Abstract: Disclosed is a carburetor containing an electromagnetic device for stopping a first lever, the first lever positions a throttle valve in one of two positions, each of which produces a small but different opening amount for the throttle valve. A common housing contains the electromagnetic device and an electronic control circuit operating it. A second lever operated by an accelerator pedal moves the first lever through a lost motion mechanism.