Real-time diagnosis method and system for vehicle faults based on tbox

Abstract

The application discloses a vehicle fault real-time diagnosis method and system based on TBOX, relates to the technical field of fault diagnosis, and comprises the following steps: TBOX adaptively switches a sampling mode according to a calculation load and a bus communication state to obtain a vehicle-mounted bus link characteristic flow; the reflection wave characteristics of the vehicle-mounted bus link characteristic flow are analyzed, and the communication link impedance state is calculated; signal correction and phase compensation are performed; whole-vehicle high-fidelity logic signals and communication link reliability indexes are generated; the whole-vehicle high-fidelity logic signals are mapped into discrete sequences reflecting signal evolution rules; the distribution complexity characteristics of the discrete sequences are quantified; the running state characteristic vector is generated in combination with the communication link reliability indexes; the running state characteristic vector is matched with a preset fault tree model for reasoning; the fault type is determined; and a vehicle health state diagnosis conclusion is output. The application improves the sensitivity and accuracy of real-time diagnosis of the sub-health state of the vehicle.

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