Abstract: An ultrasonic device for measuring the rate of flow of fluid in a duct employs an ultrasonic signal transmitter and two ultrasonic signal receivers operating simultaneously, and the respective energy paths joining the receivers with the transmitter form predetermined angles of inclination with respect to the axis of the duct. Phase differences between the signals received by the receivers, and the pressure of the fluid in the duct, are used to form an output signal indicative of the mass flow rate of fluid in the duct.

Abstract: A device for the external connection of electrical cables electrically connected to component elements disposed within a container body comprising ordered housing means through which pass these cables which extend out of the container body.

Abstract: The unit is constituted by a manifold defining a fuel duct for fuel which is supplied to the injectors and by a pressure regulator operable to maintain the pressure of the fuel substantially constant within the manifold. The unit substantially comprises a chamber which is formed within and at one end of the said duct and which is separated from the remaining part of this duct by means of a separation element inserted into the duct itself and shaped in such a way as to define channels for the fuel between the chamber and the remaining part of the duct itself.

Abstract: A valve having a body inside which slides a plugging member integral with a keeper forming part of a magnetic circuit, which circuit comprises the walls of the aforementioned body, and a core located inside the same. The body presents a bottom wall having a hole through which slides the aforementioned plugging member, and the keeper presents an annular projection located on one side in relation to the aforementioned wall and having an outside diameter greater than that of the aforementioned hole, so as to provide for substantially axial magnetic flow lines between the aforementioned bottom wall and the keeper.

Abstract: A housing system for a central electronic processing unit of a heat engine, including a first part connected with heat-developing component elements of the processing unit, this first part contacting over at least a substantial part of its surface, an outer surface of a portion of a fuel mixture induction manifold of the engine.

Abstract: A non-linear position transducer for detecting the position of a valve controlling the rate of flow of air inducted to the cylinders of a heat engine comprising a first means for detecting the position of this valve, and second means coupled to the first means and operable to provide an electrical output signal in non-linear relationship with the position of the valve, and in which these second means comprise an electrical circuit having only passive components.

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: An electrically-operated fuel pump is provided for supplying fuel to the fuel injection system of a spark-ignition I.C. engine. The pump comprises a casing wherein there is located a small electric motor and a rotary pumping assembly. The rotor of the motor is drivingly coupled to the impeller of the pumping assembly. The pump also includes a pressure relief valve for preventing the build up of excessive pressures within the casing, and a non-return valve provided at the pump outlet. The pump casing serves not only as a fuel containment member and a mechanical supporting structure, but also as the magnetic frame of the motor stator.

Abstract: The pressure regulator keeping a constant difference between the fuel pressure supplied to the injectors and the fuel pressure in the intake manifold of an internal combustion engine, comprises a pressure sensitive diaphragm associated with closure means of the inlet opening of a fuel returning pipe to the vehicle tank. Spherical joint means are disposed between said closure means and said inlet opening in order to maintain a parallel relationship between them.