Abstract:
A system for transmitting signals, particularly between command-signals generating devices, sensor devices and actuator devices fitted in motor vehicles (A), includes:
- a plurality of peripheral interface units (5, 6) each associated with at least one device, - a main unit (2) which can converse with the peripheral units (5, 6), and - communication lines (3) which branch out from the central unit (2) towards the peripheral units (5, 6).
The peripheral units (5, 6) are connected to the communication lines (3) in a generally interchangeable manner.
Abstract:
The invention relates to an ignition system, particularly of the static-distribution type, in which a respective ignition coil (C) with a primary winding (5) and a secondary winding (6) is coupled to the sparking plug (SP) associated with each cylinder. The system includes a respective switching transistor (T) for each ignition coil (C) and control circuit devices (4, 7 -11) which, in order to generate a spark in a plug (SP), cause a first switching of the corresponding transistor (T) from the shut-off condition to the conducting condition to start the flow of current in the primary winding (5) of the associated coil (C), and a second switching to the shut-off condition to stop the flow of current in the coil (C), causing the striking of the spark. These control circuit devices (4, 7 - 11) are arranged to control the speed of the first switching of the transistor or transistors (T) concerned from time to time, for each ignition, so that the first switching takes place gradually at a speed less than a predetermined value. The amplitude of the voltage peak which is applied to the sparking plug (SP) in correspondence with the first switching is thus drastically reduced.
Abstract:
The system controls the operation of a engine (1) provided with a turbocompressor (2) comprising a driving turbine (3) driven by the exhaust gases flowing through the exhaust manifold (4) and a compressor (5) for supplying compressed air to the air intake pipe (6) of the engine (1). The system comprises an exhaust valve (waste-gate) (7) coupled to the exhaust manifold (4) upstream of the turbine (3), a pneumatically-controlled actuator device (8) for controlling the opening of the valve (7) in dependence on the pneumatic pressure supplied to an operating chamber (8a) of the actuator (8), an operating solenoid valve (9) for putting the operating chamber (8a) of the actuator (8) into communication with the inlet manifold (6) of the engine (1), a first electrical pressure sensor (11) positioned in the inlet manifold (6) of the engine (1), a second pressure sensor (12) for monitoring the pressure supply to the operating chamber (8a) of the actuator (8), a plurality of further sensors (13) for supplying electrical signals indicative of the operating conditions of the engine (1), and an electronic control unit (20) arranged to actuate the solenoid valve (9) according to a predetermine law in dependence on signals supplied by the sensors (1, 12, 13).
Abstract:
An electrical sensor device, particularly a pressure sensor device, comprises at least one pressure transducer, (11 to 14), particularly a thick-film transducer, connected to a monitoring circuit (10) arranged to output an electrical signal (V) which is variable in dependence on the pressure (p), an interface circuit (15 to 17) connected to the monitoring circuit (10) and arranged, in response to the said signal (V), to present an output resistance which increases or decreases in accordance with a predetermined response curve, on increase in the pressure (p) detected by the transducers.
Abstract:
The system, for a four-stroke, four-cylinder engine, comprises:
sensors that provide signals indicative of the running conditions of the engine, two ignition transformers, having their respective output windings connected to the spark plugs of a respective pair of cylinders of the engine, means for monitoring the current flow in the input windings of these transformers, switching means for selective connection in alternation to the input windings of these transformers, and a microprocessor unit.
The switching means comprise two electronically controlled switch devices, respectively in series with the input winding of the first and of the second ignition transformer, connected together in a current path in parallel. A third switch device, controlled by the microprocessor unit, selectively connects the output of a single integrated circuit controlling the angle of "dwell" to either the first or the second controlled switch device, in dependence on the signals provided by the microprocessor unit.