Marelli Autronica

Marco Calfus

A circuit for controlling an inductive load for an electro-injector of a diesel-cycle internal combustion engine is operated from the vehicle battery and includes a reactive circuit having an energy-storage inductor. A first switch controls the supply of current to the energy-storage inductor and a second switch is provided for connecting the reactive circuit to the inductive load for rapid discharge of the energy stored in the energy-storage inductor load into the inductive so as to inject a current pulse into the load. A by-pass branch circuit is connected between the first switch and the load and includes additional switch for enabling the passage of current from the battery to the load when the first and second switches are simultaneously closed.

Circuit for controlling inductive loads, particularly for the operation

A piloting circuit for inductive loads, particularly for operating the electro-injectors of a diesel engine, comprises an input for connection to a low tension supply, a storage coil for storing energy delivered by the supply, and electronic switching devices for controlling the connection between the input, the storage coil and each of the loads in a predetermined manner to achieve a rapid transfer of current each of the loads selectively a capacitor situated in parallel with the branch circuits containing the loads and connected to the coil and the electronic switching devices, and an electronic control unit. The electronic control unit pilots the electronic switching devices according to a first operative mode in which, to transfer current to one of the loads, the switching devices cause in succession, after the connection the storage coil to the supply, the connection of the storage coil to the capacitor so as to form a resonant circuit, and then the discharge of the resonant circuit into the load.

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Turin, Italy

Marco Calfus