Abstract: A diesel fuel injection system in a motor vehicle provided with a diesel engine has a common rail and a filter arranged along a duct which delivers diesel to the common rail and houses a heater; the heater is activated by electronic control units so as to heat the filter in response to a activation signal, which is generated by an event leading to the opening of a driver side door of the motor vehicle.

Abstract: A control circuit that drives an electronic actuator. The control circuit includes a direct voltage source, a chopper circuit arranged between the source and an electric actuator, and an electronic control circuit designed to apply to the chopper circuit a command signal of the PWM type, with a predefined ON/OFF switching period and a predetermined duty cycle, for a predefined activation time, to produce a flow, within the electric actuator, of a correspondingly switched current having a nominal duration corresponding to the activation time. The control circuit detects the last whole or complete switching period included within the activation time, splits, in accordance with a predefined duty cycle, the final interval including the last complete switching period and any subsequent fraction of a switching period included within the activation time, and drives the chopper circuit in this final interval.

Abstract: The control circuit comprises: a direct voltage source; a chopper circuit arranged between the source and an electric actuator; and an electronic control circuit designed to apply to the chopper circuit a command signal of the PWM type, with a predefined ON/OFF switching period and a predetermined duty cycle, for a likewise predefined activation time, so as to produce a flow, within the electric actuator, of a correspondingly choppered current having a nominal duration corresponding to the activation time. The unit being arranged to: detect the last whole or complete switching period included within the activation time; allocate in accordance with a predefined duty cycle the final interval comprising said last complete switching period and any subsequent fraction of a switching period included within said activation time, and correspondingly drive the chopper circuit in this final interval.