Method for diagnosing a mechanism of untimely cut-offs of the power supply to a motor vehicle computer

摘要

A method for diagnosing a mechanism of untimely cut-offs of the power supply to a motor vehicle computer (1) which is programmed to execute a startup routine when woken up and a shutdown routine before being put into sleep mode, includes, at the time of each shutdown routine, generating and storing in storage elements a marker representing a completed execution of the shutdown routine, and at the time of each startup routine, checking for the presence of a marker, and if the marker is present, reinitializing the storage elements of the marker, and if the marker is absent, generating a data element representing a power supply fault.

主权项

1. A method for diagnosing a mechanism of untimely cut-offs of the power supply to a motor vehicle computer (1) which is programmed to execute a startup routine when woken up and a shutdown routine before being put into sleep mode, the method comprising:
at the time of each shutdown routine, generating and storing in storage means a marker Vext representing a completed execution of said shutdown routine, and at the time of each startup routine, checking for the presence of a marker Vext and: when the marker Vext is present, reinitializing the storage means of said marker, and when the marker Vext is absent, generating a data element representing a power supply fault, wherein, in the absence of the marker Vext at the time of a startup routine, a power supply fault counter is incremented, and a diagnosis of real failure is specified for a predetermined value n of said counter.