Abstract: The device allows the monitoring and diagnosis of the functioning of a system for controlling the stopping and restarting of an internal combustion engine for motor vehicles, comprising a plurality of electrical sensors which output two-level signals indicative of the condition of members which control the running of the engine and/or of respective controlled parameters or ranges, and an electronic monitoring and control unit with a microprocessor, connected at its input to the sensors and at its output to actuators for causing the engine to stop and restart. The diagnostic device comprises an interrogation device for carrying out a succession of sequential cyclical scans of the outputs of at least some of the sensors, and for generating, at each scan, a serial signal comprising a plurality of two-level signal portions, each indicative of the level of signal produced at the output of the respective sensor.

Abstract: A device for monitoring the pressure of fluid in an electrically conductive duct, such as an injection duct of a diesel engine, includes at least one electrical pressure transducer connectible mechanically and electrically to the outer surface of the duct, and support means for keeping the transducer in connection with the duct. A rigid casing for surrounding and protecting the support means and the transducer is formed in two parts which are hinged together so as to clamp the transducer to the duct. This casing is constituted at least in part by an electrically conductive material and has an internal electrical connection with the output of the transducer, whereby signals output by the transducer in operation can be picked up directly by the casing.

Abstract: An antiskid braking system of the type which includes a threshold circuit which at a first threshold level releases the brakes and at a second threshold level reapplies the brakes according to the deceleration of the vehicle. A correction signal circuit varies the first threshold level in dependence upon or more dynamic parameters of the vehicle such as the wheel speed and/or vehicle deceleration to optimise the anti-skid braking.