A walking machine hydrostatic system and a control method thereof

By optimizing the hydraulic circuit and control logic of the hydrostatic system and combining it with the engine load rate to control the electric proportional relief valve in real time, the problems of overheating, slow response and safety hazards in the travel drive system of construction machinery are solved, and rapid response and component protection are achieved.

CN119196103BActive Publication Date: 2025-10-14CHINA RAILWAY CONSTR HEAVY IND
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Patent Information

Application Number
CN202411253970.2
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-09-09
Publication Date
2025-10-14
Estimated Expiration
2044-09-09

AI Technical Summary

Technical Problem

The existing travel drive systems of engineering machinery have problems such as engine overspeed, component damage, and system pressure loss during braking. Existing solutions have shortcomings such as severe heat generation, slow response speed, and major safety hazards.

Method used

The static hydraulic system consists of a variable piston pump, an oil charge pump, a balancing valve, an electric proportional relief valve, etc. By optimizing the hydraulic circuit and control logic, the electric proportional relief valve is controlled in real time in combination with the engine load rate and rated braking torque to limit the brake side pressure, protect the hydraulic components, utilize the engine braking energy, and reduce system heat.

Benefits of technology

It achieves rapid response, effectively protects hydraulic components, avoids engine overspeed, reduces system heating and energy loss, and improves system safety and reliability.

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Abstract

The present application discloses a hydrostatic system for a walking machine and a control method thereof, wherein the hydrostatic system includes a variable piston pump, an oil charge pump, a first balancing valve, a large-flow check valve, a pressure-reducing main valve core, a first control cover plate, an overflow main valve core, a second control cover plate, a variable piston motor, and a second balancing valve; the control method includes the following steps: S1, obtaining a handle value; S2, if the handle value is less than 0, or the handle value is greater than or equal to 0 and the engine feedback load rate is greater than a, setting a target current I of the electric proportional overflow valve in the first control cover plate; f =0, the electric proportional relief valve is set to the maximum value; S3, if the handle value ≥ 0 and when the engine feedback load rate is < a, the target current I of the electric proportional relief valve is calculated based on the current displacement value of the variable piston pump and the rated braking torque T of the engine. f The electric proportional relief valve is controlled in real time. This application solves the technical problems of severe system heating, slow response, potential safety hazards, and easy damage to components.
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