Compound drive system and control method of electric excavator

Abstract

The invention relates to a compound drive system of an electric excavator. The compound drive system of the electric excavator comprises a first motor, a second motor, a load-sensitive valve, a pressure sensor and a vehicle control unit; the first motor is configured to drive a turning device of the electric excavator; the second motor is configured to drive a hydraulic pump so as to provide hydraulic oil for a plurality of action execution elements of the electric excavator; the load-sensitive valve is in communication between the hydraulic pump and the action execution elements and can adjust the oil supply pressure and flow according to the pressure and flow requirements of the action execution elements; the pressure sensor is configured to measure the pressure of a load-sensitive oil port of the load-sensitive valve; and the vehicle control unit is in communication connection with the pressure sensor and is configured to enable the first motor to selectively work in a single actionmode or a composite action mode according to a pressure measurement value of the pressure sensor. According to the embodiment of the compound drive system and control method of the electric excavator, the driving requirements of the electric excavator in the single action mode and the composite action mode can be considered, the coordination among actions of the electric excavator is improved, and then the controllability and the working efficiency of the electric excavator are improved.

Description

technical field [0001] The present disclosure relates to the field of engineering machinery, in particular to a compound drive system and a control method of an electric excavator. Background technique [0002] All the actions of the traditional diesel-powered excavator are driven by hydraulic oil. When excavating and unloading, the excavator needs to use action actuators, such as the action of the boom, arm, bucket, and bulldozer, and excavation Compound operation of machine turning action. [0003] However, limited by the power of the engine, when the power of the hydraulic pump is constant, it is easy to have insufficient flow when performing compound actions, which makes the overall work efficiency of the excavator low, and various actions cannot be taken into account. Therefore, users often complain about handling problems. Contents of the invention [0004] In view of this, the embodiments of the present disclosure provide a compound driving system and control metho...

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Problems solved by technology

[0003] However, limited by the power of the engine, when the power of the hydraulic pump is constant, it is easy to have insufficient flow when performing compound actions, which makes the overall work efficiency of the excavator low, and various actions cannot be taken into account. Therefore, users often complain about the problem of handling.

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