Proportional control system and proportional control method for non-contact steering limit

Abstract

The invention discloses a non-contact steering limiting proportional control system and a proportional control method, which are designed on the basis of a displacement sensing technology and a variable hydraulic technology. The proportional control system comprises a hydraulic oil tank, an electric proportional variable steering pump, an LS flow amplifying valve module, an LS steering gear module, a positive-negative rotation intent sensor assembly, a steering wheel rotating speed sensor, an electric proportional overflow valve module, a steering oil cylinder, a displacement sensor assembly and a controller. According to the proportional control method, relative displacement variation of a hinge body or a steering oil cylinder is acquired through the displacement sensor, and the controller is used for transmitting a control signal to the electric proportional overflow valve module according to different working conditions to control the working condition of the electric proportional overflow valve module, thereby realizing a buffering limiting function or a rapid reverse steering function and the like of a steering destination. The non-contact steering limiting proportional control system and the proportional control method have the advantages of adoption of electric proportional non-contact continuous interval control, small impact among components, high safety and high reliability.

Description

technical field [0001] The invention relates to a proportional control system and a proportional control method of a non-contact steering limit based on displacement sensing technology and variable hydraulic technology for large articulated steering vehicles (such as articulated mining trucks, wheel loaders, etc.). Background technique [0002] For large and heavy-duty articulated steer vehicles, when the vehicle is turned to the maximum steering angle position, there are three main reasons that will cause a large impact on the front and rear articulated devices: (1) the mass inertia of the vehicle body is large; (2) the operator's road feel And the steering feel error leads to excessive operation of the steering wheel or steering handle (joystick); (3) The steering hydraulic system fails to throttle and adjust the speed in time (timely overflow or the flow of the steering pump cannot be quickly lowered in time). This huge impact at the end of the steering has a great impact...

AI Technical Summary

Problems solved by technology

[0006] (3) Due to the relatively large impact at the steering end position, the reliability of the steering hydraulic system decreases due to sudden changes in pressure and flow, the reliability of the vehicle decreases due to frequent intense vibrations, and the operator's discomfort in the cab, etc.

[0007] (4) The damping and buffering performance of the limit rubber block is sensitive to the ambient temperature, and it is easy to fail when the temperature is too low or too high

[0008] (5) The upper limit rubber blocks of heavy-duty and large-scale articulated vehicles are relatively large, and the above shortcomings are more obvious

[0010] (1) The cut-off valve is based on the switch principle, and the internal pressure shock of the hydraulic system is still relatively large at the moment of cut-off;

[0011] (2) The installation and manufacturing accuracy of the cut-off valve and the limit block (rod) is high, and the adjustment is difficult;

[0012] (3) It is contact type, the impact between parts is large, and it is easy to fail

[0015] (2) When the steering inertia of the frame exceeds this point, the function of cutting off the buffer becomes invalid

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