Abstract: The common rail supplies a number of injectors of the cylinders of the engine, and is supplied by a constant-displacement high-pressure pump in turn supplied by a low-pressure, variable-delivery, variable-pressure, motor-driven pump. The control device has an electronic control unit for receiving signals indicating operating conditions of the engine; the suction side of the high-pressure pump has a choke; and the control unit controls the motor-driven pump to vary the fuel pressure upstream from the choke between a predetermined maximum value and a predetermined minimum value, so as to regulate the fuel intake of the high-pressure pump within a predetermined range.

Abstract: The device has an electric circuit for generating a first electric current of such a predetermined value as to excite the electromagnet to open the metering valve, and a second electric current of a lower value such as to keep the electromagnet excited; and a timing device for controlling the electric circuit as a function of operating conditions of the engine. The timing device also controls the electric circuit in such a manner as to vary the duration of the first current as a function of the operating temperature of the engine.

Abstract: The common rail supplies a number of injectors of the cylinders of the engine, and is supplied by a constant-displacement high-pressure pump in turn supplied by a low-pressure, variable-delivery, variable-pressure, motor-driven pump. The control device has an electronic control unit for receiving signals indicating operating conditions of the engine; the suction side of the high-pressure pump has a choke; and the control unit controls the motor-driven pump to vary the fuel pressure upstream from the choke between a predetermined maximum value and a predetermined minimum value, so as to regulate the fuel intake of the high-pressure pump within a predetermined range.

Abstract: The device has an electric circuit for generating a first electric current of such a predetermined value as to excite the electromagnet to open the metering valve, and a second electric current of a lower value such as to keep the electromagnet excited; and timing means for controlling the electric circuit as a function of operating conditions of the engine. The timing means also control the electric circuit in such a manner as to vary the duration of the first current as a function of the operating temperature of the engine.

Abstract: The diagnostic method includes the steps of generating an acceleration signal related to the intensity of vibration in an engine; comparing the amplitude of the acceleration signal with a predetermined reference amplitude value; generating a fault indicator when the amplitude of the acceleration signal exceeds the predetermined reference amplitude value; determining a crossover drive angle value upon the amplitude of the acceleration signal exceeding the predetermined reference amplitude value; comparing the crossover drive angle value with a predetermined reference angle value; and generating a fault signal in the event the crossover drive angle value is less than the predetermined reference angle value.