Energy consumption optimization method for double-variable hydraulic system under changing work conditions

Abstract

The invention discloses an energy consumption optimization method for a double-variable hydraulic system under changing work conditions. The energy consumption optimization method comprises the following steps of: building a hydraulic cylinder displacement, hydraulic loop pressure and hydraulic loop flow rate database through an experiment; to a hydraulic system in running, searching and acquiringthe hydraulic loop pressure and flow rate requirements under the corresponding work condition in the database according to displacement information received by a sensor; regulating the rotating speed of a motor and the output of a pump by using a controller to make sure that the output hydraulic loop pressure of the pump and the hydraulic loop flow rate meet the hydraulic loop pressure and the hydraulic loop flow rate requirements under the corresponding work condition; when the work condition changes, controlling the motor to be switched from an optimal speed to the required speed for the next work condition by using the controller according to an optimal motor acceleration calculated and acquired by the energy consumption optimization method of the system; and meanwhile regulating theoutput of the pump to reach the required output. The energy consumption optimization method disclosed by the invention can be used for controlling the rotating speed, the output of the pump and the acceleration of the motor at an adjacent work condition point under all work conditions according to an energy minimum requirement and farthest guarantees energy consumption minimum of a hydraulic machine in continuous running.

Description

Technical field [0001] The invention relates to a method for optimizing energy consumption of a dual-variable hydraulic system under changing working conditions, which is used to control the rotation speed, pump displacement and the acceleration of the motor at adjacent working conditions under various working conditions according to the minimum energy requirements, to the greatest extent To ensure that the hydraulic press has the lowest energy consumption during continuous operation. Background technique [0002] With the wide application of high-power hydraulic equipment, the energy loss caused by the mismatch between installed power and actual load power has become increasingly obvious. The application of variable speed motors and variable pumps can adjust the output power of the drive unit according to changes in load, so as to match the output power with the load power, thereby reducing energy consumption at the power input. [0003] The proportional variable pump driven by t...

AI Technical Summary

Problems solved by technology

However, although this method ensures that the driving system has high efficiency under various static working conditions, it cannot guarantee that the driving system has high efficiency when the working conditions change, and it cannot guarantee that the entire system has the lowest energy consumption during operation.

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