An electrical circuit, particularly an electronic power circuit for motor vehicle injection systems, with a function for the detection and diagnosis of faults, and method related thereto

摘要

During the piloting of the load (A, B), the current intensity and the voltage present in the load are monitored (9A, 9B) by the comparison of their values with a current threshold and with a window of permissible voltage values. When the voltage is outside the window of permissible values and/or the current falls below its threshold, a fault message (FAULT) is generated and the nature of the fault (open load, short circuit to earth, short circuit to the supply voltage) is also identified by the emission of a corresponding signal of a diagnostic nature (DIAGA, DIAGB). The identification (STAGE) of the faulty stage or stages is also provided for in the case of a circuit including several stages in parallel. The preferred application is to the piloting of the injection in internal combustion engines.