Electro-hydraulic loading device based on hydraulic tractor steer-by-wire system

Abstract

The invention discloses an electro-hydraulic loading device based on a hydraulic tractor steer-by-wire system. The electro-hydraulic loading device is designed for tractors which are relatively slow in development, and complex and changeable in working environment, and is an indispensable importable part for guaranteeing that developing, designing and performance testing can be effectively conducted on the hydraulic steer-by-wire system. According to the electro-hydraulic loading device, the structural characteristic that a single-side single hydraulic cylinder steering trapezium of the hydraulic steer-by-wire system is positioned frontward is utilized for symmetrically arranging a hydraulic loading oil cylinder (1) and a hydraulic steering cylinder (16) of a tractor on the two sides of the trapezium of the steering system, and the ground lateral resistance borne by tires when the tractor steers is simulated through knuckle abutting. The electro-hydraulic proportion control technology which is widely applied at present is adopted in the electro-hydraulic loading device, the effects that loading force changes continuously, quickly and accurately and loading methods are varied can be achieved, the basic requirements of the hydraulic steer-by-wire system are met, and the electro-hydraulic proportion loading device has certain commonality and is applicable to loading of various vehicle steering systems.

Description

technical field [0001] The invention relates to a vehicle electronic control frame test device, in particular to a tractor-by-wire hydraulic steering test bench, in particular to an electro-hydraulic loading device based on a tractor-by-wire hydraulic steering system. Background technique [0002] Due to the particularity of the working environment, most tractors currently use hydraulic systems as their power output, and the steering system is mainly based on full hydraulic steering. The full hydraulic steering system has the advantages of large force, good system rigidity, and convenient layout, and the development of this technology is very mature, which is suitable for vehicles with low driving speed; but in the process of use, there are often failures such as heavy steering and failure . The wire-controlled hydraulic steering system cancels the mechanical connection between the steering wheel and the steering front wheels. Compared with the "wire-controlled steering sy...

AI Technical Summary

Problems solved by technology

At present, there are few loading test benches applied to the tractor steering system, and most of the existing domestic and foreign loading test benches are loaded with simple mechanical spring loading and non-impact magnetic powder brakes, which are not continuous and accurate. Insufficiencies such as simulated loading force and poor real-time performance

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