Virtual diagnosis system and method for automatic transmission

Abstract

The invention discloses a virtual diagnosis method and system for an automatic transmission and aims at solving the problem that existing fault detection and diagnosis method cannot meet the requirement of high-efficiency and intelligent automatic transmission fault diagnosis. In the invention, function realization and failure conditions of each gearshift element are analyzed through power flow of each gear of the automatic transmission, and then the specific position of the faulted element of the automatic transmission is determined through a testing method. The diagnosis system mainly consists of a diagnosis platform and a testing analysis system, wherein the diagnosis platform comprises a PX1 controller, a CAN (Controller Area Network) bus interface card, a vehicle TCU (Transmission Control Unit) to be tested, a vehicle running state sensor and a roller bench for providing road running simulation; the testing analysis system comprises a power-flow-based diagnosis system platform constructed by LabVIEW2011. The design relates to the virtual diagnosis platform of the automatic transmission based on the power flow theory, which has the advantages of reasonable structure, simplicity and convenience in operation, reliable performance, high generality, low manufacturing cost and high accuracy, and can satisfy production and maintenance testing requirements.

Description

technical field [0001] The invention relates to a fault diagnosis device in the field of automobile industry, more precisely, it relates to a virtual diagnosis system and diagnosis method of an automatic transmission based on power flow theory. Background technique [0002] In order to ensure the safety of the car, whether there is abnormal noise in the operation of the automatic transmission, whether the gear shift is smooth and smooth, and whether the gearbox is leaking oil are the main inspection items in the field of automatic transmission inspection. At present, automatic transmissions generally have a fault self-diagnosis system. However, the on-board fault self-diagnosis system can only identify faults belonging to the electronic and electronic control aspects, and is not suitable for fault diagnosis of the hydraulic system and mechanical system of the automatic transmission. Due to the complex structure of the automatic transmission, there are different failure mech...

AI Technical Summary

Problems solved by technology

[0003] Aiming at the inability to efficiently detect the running state of the automatic transmission and diagnose the faults of the automatic transmission at present, the present invention provides a device with reasonable structure, simple operation, reliable performance, strong versatility, low manufacturing cost, high precision and can meet the requirements of production and maintenance manufacturers. Virtual diagnostic system and diagnostic method for automatic transmission based on power flow theory for testing requirements

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