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access icon openaccess Dynamic characteristic analysis and fault diagnosis of load-sensitive drive system for loaders

This is an open access article published by the IET under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0/)
Received 28/09/2018, Accepted 12/10/2018, Published 22/10/2018

A certain type of crawler loader often appears flameout in unilateral steering, which makes the performance of the whole machine greatly affected. By analysing the dynamic characteristics of the load-sensitive drive system, it is found that the hydraulic fluctuation and the power matching between the hydraulic pump and the engine are the fundamental reasons for the failure. In order to solve this problem, a simple and easy improvement scheme is designed on the premise of not affecting the engine efficiency: a suitable size damping is connected in the middle of the two load feedback lines of the drive system to solve the power matching between the engine and the hydraulic pump and reduce the hydraulic fluctuation of the system. Simulation and experimental results show that this method can effectively solve the problem of stalling in the steering process of loaders and greatly improve the dynamic performance of the system.

Inspec keywords: feedback; hydraulic systems; steering systems; pumps; fault diagnosis; loading equipment

Other keywords: unilateral steering; load feedback lines; power matching; dynamic performance; fault diagnosis; loader steering process; hydraulic pump; engine efficiency; crawler loader; easy improvement scheme; dynamic characteristics analysis; hydraulic fluctuation; simple improvement scheme; load-sensitive drive system

Subjects: Materials handling equipment; Vehicle mechanics; Fluid mechanics and aerodynamics (mechanical engineering); Mechanical components

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