Proportional Control System and Proportional Control Method of Non-contact Steering Limit

Abstract

The invention discloses a non-contact steering limited ratio control system and a ratio control method, wherein the ratio control system is designed based on a displacement sensing technology and a quantitative proportion overflow hydraulic technology. The ratio control system comprises a hydraulic oil box, a quantitative steering pump, a switch overflow valve module, a flow amplifier valve module, a steering gear module, a forward and reverse steering intention sensor assembly, an electric proportional overflow valve module, a steering cylinder, a displacement sensor assembly and a controller. The ratio control method comprises the steps that the displacement sensor collects the relative displacement variable quantity of a hinging body or the steering cylinder; and the controller transmits control signals to the electric proportional overflow valve module according to different working conditions to control the working conditions of the electric proportional overflow valve module, so that a buffer limiting function or a fast reverse steering function and the like of a steering end point is realized. According to the ratio control system and the ratio control method disclosed by the invention, non-contact and continuous interval control are adopted, so that the impacts between components are small and the safe reliability is high.

Description

Technical field [0001] The invention relates to a non-contact steering limit proportional control system and a proportional control method for large articulated steering vehicles (such as articulated mining cards, wheel loaders, etc.). Background technique [0002] For large and heavy articulated steering vehicles, when the entire vehicle is turned to the maximum steering angle position, there are three main reasons that will cause greater impact on the front and rear articulated devices: (1) The body mass inertia is large; (2) The steering feel of the operator / Road sense error causes the steering wheel or the steering handle (joystick) to over-operate; (3) The steering hydraulic system fails to throttle and adjust the speed in time (overflow in time or the flow rate of the steering pump cannot be quickly reduced in time). The huge impact of this steering terminal has a great impact on the reliability of the body structure, the reliability of the hydraulic system, and even the l...

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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