An energy-saving control system, excavator and method

Abstract

Disclosed are an energy-saving control system, excavator and method, belonging to the field of mechanical control. The energy-saving control system comprises a regulator (1), a main pump (2) and a main valve (3), wherein a central oil channel (4) is provided in the main valve (3), the central oil channel (4) is provided with an inlet and an outlet, the regulator (1), the main pump (2) and the inlet of the central oil channel (4) communicate in succession, a pilot pressure sensor (5) is provided on the main valve (3), an electromagnetic proportional valve (6) is further provided at the outlet of the central oil channel (4), and the pilot pressure sensor (5) and the electromagnetic proportional valve (6) are connected to a controller (7). The energy-saving control method comprises setting an estimated oil return amount Q0 of the central oil channel (4); calculating an actual oil return amount Q of the main valve central oil channel (4); and if Q > Q0, the controller (7) controlling a reduction in the extent to which the electromagnetic proportional valve (6) is open, reducing the oil return amount of the central oil channel (4). By means of controlling the electromagnetic proportional valve (6) in regulating the oil return amount of the central oil channel (4), the working efficiency of the machinery is increased, the oil consumption is reduced, and the responsiveness is relatively high.

Description

technical field [0001] The invention belongs to the field of mechanical equipment control, and relates to an energy-saving control system and method, in particular to an energy-saving control system, excavator and method suitable for excavators. Background technique [0002] At present, there are two main valves used in excavators at home and abroad: open center type and closed center type. Domestic excavator manufacturers basically use open-center systems, and some advanced foreign excavator manufacturers have begun to use closed-center systems. The "open center" system is low in price, but poor in maneuverability; the "closed center" system has good maneuverability and high efficiency, but is more expensive. [0003] The open-center system used by domestic excavator manufacturers, when the excavator moves slightly, and the main valve spool is not fully opened, part of the hydraulic oil supplied by the main pump enters the working device, and part of it flows through the c...

AI Technical Summary

Problems solved by technology

The "open center" system is low in price, but poor in maneuverability; the "closed center" system has good maneuverability and high efficiency, but is more expensive

[0003] The open-center system used by domestic excavator manufacturers, when the excavator moves slightly, and the main valve spool is not fully opened, part of the hydraulic oil supplied by the main pump enters the working device, and part of it flows through the central oil passage of the main valve. Back to the oil tank, this part of the hydraulic oil returned through the center oil passage becomes a waste of energy

Images