Abstract: The electroinjector according to the invention is provided with a small tubular armature, whose bottom wall is constituted by a plate, of material which resists deformation due to impact and directly fastened on to the cylindrical side wall of the same armature, with which a shutter of an injection nozzle is fixedly secured.

Abstract: The pressure regulator comprises a valving element caused to open or close a bleed port of the petrol circuit, and a diaphragm subjected to the pressure of said petrol and to a pressure which is a function of the engine intake pressure, said diaphragm being balanced by a force due to the action of an aneroid capsule also subjected to said pressure which is a function of the intake pressure.

Abstract: The invention relates to an injection control device for an internal combustion engine, in which a programmed microprocessor calculates the open time of a plurality of electrically operated injectors as a function of prechosen engine parameters, and determines the activation of said injectors into their open state and their deactivation into their closed state with the aid of a single timer, which counts-out the calculated open time. If a second injector is opened while a first injector is still delivering the fuel, the microprocessor calculates the difference between the open time of the second injector and the remaining open time of the first injector, so as to be able to count-out the open time of the two injectors on the single timer.

Abstract: This invention relates to a petrol injector protection sheath constructed of thermally insulating material such as rubber, for preventing overheating of said injector.

Abstract: This invention relates to a system for the regulation and control of the angle of advance in the ignition unit of an internal combustion engine, which is based on the use of a properly programmed microprocessor unit which receives the input data from a set of detectors of engine parameters, processes them and finally delivers output data representative of the regulated magnitude, that is, of the angle of advance.

Abstract: For electronically detecting the displacements of a movable member, such as the throttle of an internal combustion engine an encoding card adapted to the Gray's encoding method is matched with said movable member and an array of phototransistors and photodiodes reads the opaque and the transparent windows formed through the movable member as they pass before the photodiodes so that voltage signals are generated which represent the digit 1 when a transparent window is read out and the digit 0 when an opaque window is read out, the arrangement and the sizes of the windows are in accordance with the Gray's rules of encoding.

Abstract: This invention relates to a regulation and control system for the fuel feeding unit of an internal combustion engine, said system being based on the use of a microprocessing unit which has properly been programmed. A set of detectors of engine parameters supplies the microprocessing unit with a set of input data which are processed in the processing unit and converted into a set of output data which are representative of the regulated magnitudes, more exactly of the duration and phase setting of the fuel feed.

Abstract: An electromagnetically actuated fuel-injector for an internal combustion engine is disclosed, in which the core (15) of the coil (16) for the cuplike valve member (37) intended reciprocably to control the fuel-injecting nozzle (48) is provided with longitudinally arranged radial bores (35) in order to minimize the detrimental effects of eddy currents. Longitudinal slots (52) can be provided in said coil core according to an alternative embodiment.

Abstract: This invention relates to an electronic device for taking the speed of a rotating member. In order to provide speed signals having a different degree of discrimination at the interior of a determined range of values, the device according to the invention comprises transducer means operatively connected to the rotating member to generate a first train of pulses, pulse generating means for generating a second train of pulses at a constant frequency, counting means for counting the pulses of said second train between two subsequent selected pulses of said first train, and a microprocessor for comparing the counted pulses with reference numbers comprised between predetermined minimum and maximum values corresponding to higher and lower values of a maximum speed zone of the speed range.

Abstract: For the automatic adjustment of the number of revolutions per minute of an internal combustion engine in idling conditions when the accelerator pedal is released, a device is disclosed with which the instantaneous rpm is sensed and compared with reference values of the number of revolutions, called N.sub.1, N.sub.2 and N.sub.3, wherein N.sub.2 is smaller than N.sub.3 but equal to, or greater than, N.sub.1. These reference values can be used to preset an electronic comparison circuit, or the comparison can be effected by exploiting a mechanism comprising a metering pump, the result being always that when the rpm of the engine is below the preselected minimum, the feed of fuel to the engine is supplemented, whereas it is reduced or cut off if the situation is the contrary, that is when the engine tends to overtake the normal idling rpm.