Method and system for controlling variable output pump assembly, and engineering machinery

Abstract

The invention discloses a method and a system for controlling a variable output pump assembly, wherein the variable output pump assembly is formed by connecting n variable output pumps in parallel; according to a target output volume q of the variable output pump assembly, under a predetermined working pressure p, a functional relation between the efficiency e of the variable output pump assembly and the target outputs q1, q2, ellipsis, qn of the n variable output pumps is constructed; according to the functional relation, the target outputs q1, q2, ellipsis, qn of the n variable output pumps under the maximum efficiency max(e) of the variable output pump assembly is worked out through a optimization algorithm; and moreover, the n variable output pumps in the variable output pump assembly are controlled to run under the target outputs q1, q2, ellipsis, qn. In such a way, the efficiency and the service life of the variable output pump assembly are improved and prolonged respectively. The invention also provides engineering machinery comprising a control system of the variable output pump assembly.

Description

technical field [0001] The present invention relates to the technical field of hydraulic pump control, in particular to a control method and system for a variable-variable pump set, and construction machinery applying the control system for the variable-variable pump set. Background technique [0002] At present, the application range of the electric proportional variable pump set is very wide. The hydraulic system using the variable pump set can realize a wide range of stepless speed regulation and large transmission torque. It is a commonly used hydraulic system in the field of construction machinery. [0003] The efficiency of the variable pump unit is one of its important performance indicators. How to better control the working status of multiple variable pumps in the variable pump unit is of great significance for improving the efficiency and service life of the entire variable pump unit. [0004] In the traditional control method, the electric proportional variable pu...

AI Technical Summary

Problems solved by technology

During the working process, the displacements of multiple variable displacement pumps are equal. The disadvantage is that under many working conditions, multiple variable displacement pumps work in a small displacement range, and the leakage of the variable displacement pumps is very serious. The loss caused by friction and heat Very large, greatly reducing the volumetric efficiency and mechanical efficiency of the variable pump, thereby reducing the efficiency of the entire variable pump group; moreover, multiple variable pumps in the variable pump group work synchronously, and each variable pump will generate Corresponding life loss, thereby reducing the service life of each variable displacement pump, and finally reducing the service life of the entire variable displacement pump group

Images