Chongqing University

East China Jiaotong University

Diancheng Chen

Ruqi Ding

Min Cheng

Gang Li

Guoliang Hu

Liqiu Liao

Liping Zeng

Zhanchao He

Qianjie Liu

A method for fault diagnosis of a pressure sensor of an electro-hydraulic system with an explicit controller and an implicit controller in parallel is provided. The method may include receiving parameter information of the electro-hydraulic system; estimating a first chamber pressure of the hydraulic actuator online by utilizing a second chamber pressure of the hydraulic actuator; obtaining valve opening signals of the explicit controller and the implicit controller in a valve controller; converting the valve opening signals are difference-calculated to obtain two residual signals; and the residuals of an independent metering valveand an independent metering valveare compared with a preset threshold, respectively, to identify whether the independent metering valveand the independent metering valveare faulty or not. The method is simple to operate, has a fast response time and low cost for troubleshooting, and improves the diagnostic accuracy and coverage of the electro-hydraulic system.

Methods for fault diagnosis of pressure sensor of electro-hydraulic system with explicit controller and implicit controller in parallel

Growing community of inventors

Nanchang, China

Diancheng Chen