A Fault Diagnosis Method for Pilot Relief Valve of Power Shift Transmission

Abstract

The invention provides a fault diagnosis method for a pilot overflow valve of a power shift gearbox. The method includes: using AMESim software to establish a system simulation model of the pilot relief valve of the power shift transmission; using the system simulation model to analyze the fault of the pilot relief valve; The fault injection model of the relief valve, using the fault injection model to simulate the fault of the pilot relief valve to obtain the fault injection matrix, using the fault injection model and the fault injection matrix to train and optimize the BP neural network algorithm to obtain the fault diagnosis algorithm, through the fault injection The diagnostic algorithm performs the actual fault diagnosis of the pilot relief valve. The method of the invention adopts the BP neural network algorithm and uses the fault data obtained by simulation to carry out training optimization, can conveniently and quickly detect the fault of the pilot overflow valve of the power shift transmission, and the accuracy and reliability of the fault diagnosis algorithm are greatly improved.

Description

technical field [0001] The invention relates to the technical field of gearbox fault diagnosis, in particular to a fault diagnosis method for a pilot overflow valve of a power shift gearbox. Background technique [0002] The gearbox plays the role of power transmission and power output in agricultural machinery such as tractors. Its advantages include uninterrupted shifting power output and easy operation. At present, PST (Power shift gearbox, power shift gearbox) is driven by hydraulic pressure. The oil pressure of the hydraulic system is in the normal range is the basis for PST to complete the gear shift and power output. To stabilize the oil pressure, the gearbox controller monitors the oil pressure output of the pilot relief valve through the oil pressure sensor. The normal operation of the pilot relief valve is crucial to the hydraulic system of the entire PST. [0003] When the engine, oil pump, etc. are working normally, the pilot relief valve stabilizes the system ...

AI Technical Summary

Problems solved by technology

[0008] 1. At the same time, there can only be a normal value or a fault value for a certain parameter in the model, and the normal value and fault value cannot exist at the same time

In this way, it can only simulate the situation that the valve has a fault at the moment of starting, but for the sudden fault of the valve during operation (for example: the valve core is suddenly stuck during the operation due to foreign matter mixed in the hydraulic oil) more difficult to simulate

[0009] 2. Although the modeling method in some technical solutions can simulate faults, the model uses a standard solver to solve the variable step size operation, which cannot meet the requirements of the hardware-in-the-loop device controller for the fixed step size calculation of the model

[0010] 3. Some technical solutions propose to use the flow data of the valve or the displacement of the spool as the basis for fault diagnosis, but when the valve assembled in the power shift transmission is working, the transmission controller can only output through the oil pressure sensor The voltage or current signal proportional to the oil pressure can be used to judge the working state of the valve, so these technical solutions are only suitable for testing when the valve is removed from the gearbox, not for fault diagnosis when the valve is working

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