Abstract: The present invention is fuel metering and atomizing valve for an internal combustion engine fuel supply device. The valve comprises a nozzle in which is formed an injection hole having an upstream chamber defining gradually decreasing areas towards the mouth of the injection hole for separating the fuel jet. The present invention provides an injection hole that is easy to machine and which effectively separates the fuel jet issuing from the chamber.

Abstract: An electronic fuel injection system for an internal combustion engine comprising an electronic control system having a central processing unit for detecting engine speed, throttle setting regulating air supply to the engine, exhaust gas concentrations, and for controlling fuel injection. The central processing unit also calculates an open basic injection time, corrected by sensors for engine cooling water and air supply temperature and a closed-loop injection time using an exhaust gas sensor.

Abstract: A system for converting a signal from a substantially linear transducer detecting a parameter on a motor vehicle electronic fuel injection system, and so enabling parameter acquisition to varying degrees of accuracy; wherein the transducer is a potentiometer for detecting the setting of the throttle regulating air intake by the engine; and wherein the conversion system itself comprises an electronic circuit featuring at least one amplifier for supplying at least one signal differing in slope as compared to that supplied by the transducer; and a processing unit for enabling parameter acquisition to a degree of accuracy depending on the modified slope of the signal supplied by the aforementioned electronic means.

Abstract: The device comprises substantially an integral connection block for connection to an air manifold and to an engine wall; in said block there is provided a plurality of pairs of main air feed holes, one hole of each pair being controlled by a throttle valve; in the block there is also provided a series of supplementary idling air ducts the passage of which is controlled by a solenoid modulating valve housed in a suitable seat in the block. On the block there is also provided a series of seats for the injectors, and a pair of ducts for feeding fuel to the injectors and for its recirculation. Finally, on the block there are provided further seats for a fuel pressure regulator and for a pneumatic actuator arranged to control said throttle valves by way of a transmission.

Abstract: A device comprising a body in which is formed a chamber in which fuel is mixed with air; a cylindrical mixture delivery duct the opening of which is controlled by a throttle valve; and a body cover to which is fitted a fuel injector for supplying atomized fuel into the mixing chamber; the aforementioned mixing chamber comprising at least a first and second portion defined by differently tapered surfaces, and a third portion defined by a cylindrical surface equal in diameter to the aforementioned cylindrical mixture delivery duct; the axial length of the cylinderical surface of the third portion of the mixing chamber, measured between the axis of the throttle valve and the top edge of the third portion itself, being at least equal to the radius of the circular contour of the aforementioned throttle valve.

Abstract: A system for controlling the idling speed of an electronic-injection internal combustion engine; which engine presents an air supply valve, the minimum setting of which is controlled by at least one heat-sensitive element; and which system comprises electronic means for detecting at least the speed of the engine, the temperature of the engine cooling water, and release of the accelerator pedal, for accordingly regulating the amount of heat supplied to the aforementioned heat-sensitive 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 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.