Method and device for transforming fault monitored by external controller into diagnostic fault check in electric control system

Abstract

The invention discloses a method and a device for transforming a fault monitored by an external controller into a diagnostic fault check (DFC) in an electric control system. The method includes that when receiving an SPN (suspect parameter number) sent by the external controller, a system inquiries a first calibration table and judges whether the SPN is identical to an SPN in the table or not; if yes, the DFC corresponding to the SPN is directly found in a second table according to one-to-one correspondence of a first calibration table cell and a second calibration table cell; for a same DFC, the DFC reports faults as long as one corresponding SPN reports faults; only when all corresponding SPN have no faults, the DFC can display fault-free results. The device comprises an SPN fault state updating unit and a DFC fault state acquiring unit.

Description

technical field [0001] The invention relates to the field of fault management of electric control systems, in particular to a method and device for converting faults monitored by an external controller into fault check codes. Background technique [0002] In order to improve the performance of modern cars, more and more sensors and actuators are equipped on the car. While the electronic control system improves the performance of the car, it also makes the fault diagnosis and elimination of the car more complicated. [0003] The electronic control unit ECU (Electronic Control Unit) is the core of the electronic control system. It continuously detects the functions of each component in the electronic control system at any time. Once a fault is found, it will be detected as a fault check code DFC (Diagnostic Fault Check) immediately. The form is stored in the designated unit of the ECU, and the obtained DFC is managed in real time in the diagnostic management system DSM (Diagno...

AI Technical Summary

Problems solved by technology

It can be seen that under the above requirements, the DFC array will inevitably have some uncalibrated SPN cells, resulting in waste;

[0010] Furthermore, due to the limitation of the number of DFCs to 5, generally there are multiple SPNs corresponding to the same DFC. Identify faults monitored by external controllers;

[0011] In addition, this solution cannot meet the requirement that the number of SPNs is greater than 80

Images