Electro-hydraulic steering control system for heavy-duty truck

Abstract

An electro-hydraulic steering control system for a heavy-duty truck is provided. First and second trapezoidal steering systems are each mainly composed of an axle, two ladder-shaped arms symmetrically hinged to the outsides of the two ends of the axle, a draw bar hinged to the ends, away from the axle, of the two ladder-shaped arms, and at least one steering hydraulic cylinder, the outsides of the ends, close to the axle, of the two ladder-shaped arms are connected with two tires, the piston rod end of the steering hydraulic cylinder is hinged to the middle of one trapezoidal arm, the cylinder barrel base of the steering hydraulic cylinder is hinged to one side, close to the one trapezoidal arm, of the axle, and a corner sensor is also assembled at the hinge point of the axle and the one trapezoid arm. The draw bars of the first and second trapezoidal steering systems are each composed of a connecting rod and a draw bar hydraulic cylinder. Each draw bar hydraulic cylinder is internally provided with a displacement detection device. The corner sensors, the displacement detection devices and electromagnetic proportional valves are connected with a controller. The control system can effectively reduce or eliminate the steering angle error, and can effectively reduce the abnormal wear of the tires and fuel consumption.

Description

technical field [0001] The invention relates to the technical field of heavy-duty truck steering control, in particular to an electro-hydraulic steering control system for heavy-duty trucks. Background technique [0002] In recent years, with the construction and maintenance of more and more large-scale infrastructure projects and the needs of large-scale petrochemical, power generation and other industries, the related technologies of heavy-duty trucks have made great progress. In order to be able to carry more weight, heavy-duty trucks are designed with multiple axles, generally at least 3 axles. For example, on all-terrain cranes and military super-heavy off-road vehicles, the number of axles can reach 8-10. In order to meet the vehicle's requirements for maneuverability and curve passing ability during short-distance field transfer or low-speed turning, all or most of the axles of the heavy-duty truck chassis currently produced have steering capabilities. [0003] In o...

AI Technical Summary

Problems solved by technology

However, in fact, no matter whether it is a purely mechanical pull-rod steering system or a mechanical-plus-electric-hydraulic compound steering system, all tires cannot meet the requirements of pure rolling steering of a car at the same time due to the use of a traditional trapezoidal steering structure ("A New Type of Automobile") Steering Mechanism Design Research and Simulation Analysis" Cai Wei, Chongqing University of Technology, 2014)

Because the length of the trapezoidal arm and the tie rod in the traditional trapezoidal structure cannot be adjusted, the vertical lines of each tire cannot intersect at one point during the actual steering process, that is, there is a large error between the actual steering angle of each tire and the ideal angle. , this situation is most obvious when turning at a large angle

For heavy-duty vehicles, such steering angle errors will cause excessive wear of the tires, increase the driving resistance of the vehicle, and waste more fuel

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