Excavator hydraulic system anti-air-suction controlling method and controlling device and excavator

Abstract

The invention discloses an excavator hydraulic system anti-air-suction controlling method and controlling device and an excavator. The controlling method comprises the steps that: a pilot pressure value and a main pump pressure value are acquired; whether an excavator hydraulic system is in an air sucking status is judged based on the pilot pressure value and the main pump pressure value; and if the excavator hydraulic system is in the air suck status, compensating current is added to controlling current of a main pump to enable the main pump to adjust output oil amount based on the compensating current. Electric signals replace traditional hydraulic signals in judging whether the hydraulic system is in an air sucking status; the air sucking risk is lowered in a manner that oil supply amount is actively added; and the technical effects that precise judgment on whether the hydraulic system is in an air sucking status can be realized without adding extra controlling components and that the air sucking risk is lowered via linear addition of the oil supply amount to the system.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of excavators, in particular to an anti-cavitation control method, a control device and an excavator for a hydraulic system of an excavator. Background technique [0002] The positive flow hydraulic system has the advantages of low fuel consumption, high operating efficiency, and high reliability. It is widely used in hydraulic excavators. In case of valgus, stick retraction and valgus, etc., there will be air suction problems. [0003] The existing methods to solve the problem of cavitation in the hydraulic system are mainly through the following two methods: (1) Increase the oil return back pressure scheme, also known as passive anti-cavitation. From a point of view, the smaller the oil return back pressure, the better, while increasing the oil return back pressure scheme will slow down the action speed; (2) The hydraulic oil regeneration scheme, which detects the pressure on the...

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Problems solved by technology

[0003] The existing methods to solve the problem of cavitation in the hydraulic system are mainly through the following two methods: (1) Increase the oil return back pressure scheme, also known as passive anti-cavitation. From a point of view, the smaller the oil return back pressure, the better, while increasing the oil return back pressure scheme will slow down the action speed; (2) The hydraulic oil regeneration scheme, which detects the pressure on the oil inlet side and the oil return side, according to the pressure difference Supplementing oil on the suction side can slow down the cavitation to a certain extent, but the regeneration of hydraulic oil is more focused on energy reuse. Tailor-made, there is a large deviation in the adjustment speed and strength

[0004] In addition, the above two methods can only adjust the anti-air suction of a single action of the excavator, and need to introduce new control valves, pipelines, etc., which increases the production cost and complicates the system, leading to problems. Increased chance

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