Closed walking hydraulic system, control method thereof and operation machine

By adding pressure-limiting valves and control methods to the closed-loop hydraulic system, and calculating and correcting the maximum displacement of the travel pump based on operating parameters, the problem of the travel pump displacement exceeding the safety limit was solved, thus achieving safe and efficient operation of the equipment.

CN122407648APending Publication Date: 2026-07-17ZOOMLION HEAVY MASCH CO LTD
0 Cites 0 Cited by

Patent Information

Application Number
CN202610597864.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-30
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing closed-loop hydraulic systems, the displacement of the travel pump lacks an adaptive limiting mechanism based on operating conditions. This can lead to the pump exceeding its safety limit under different operating conditions, resulting in problems such as component damage or engine stalling.

Method used

By adding a pressure limiting valve to the displacement control oil circuit of the traveling pump, and combining the current operating parameters with the control method, the theoretical maximum allowable displacement of the traveling pump is calculated. The displacement is then limited by the pressure limiting valve, and closed-loop correction is performed in combination with preset evaluation parameters to ensure that the displacement is within the safety boundary.

Benefits of technology

This effectively avoids torque and power overload problems caused by excessive displacement of the mobile pump, ensuring safe and efficient operation of the equipment under different working conditions.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention belongs to the technical field of operation machinery and provides a closed walking hydraulic system, a control method thereof and operation machinery. The control method comprises the following steps: acquiring current driving working condition parameters of equipment and a target type to be controlled; according to the current driving working condition parameters and the target type, calculating the theoretical allowable maximum displacement of the walking pump when a corresponding device in the equipment reaches a design target extreme value corresponding to the target type under the current driving working condition parameters; and the pressure limiting valve is controlled, so that the maximum displacement of the walking pump is adjusted to the theoretical allowable maximum displacement. According to the method, when an operator manually controls the displacement of the walking pump, it is ensured that the displacement of the walking pump does not exceed the safety boundary of the current working condition all the time.
Need to check novelty before this filing date? Find Prior Art