Excavator slewing braking energy recovery control method

Abstract

The invention discloses an excavator rotation braking energy recovery control method. When an upper body rotary platform starts to rotate, a motor controller receives a command to enable a motor to be in a power-driven state, and the motor with an electricity generation function is driven to reach a certain work rotation speed. When the upper body platform stops rotating, the motor controller sends reverse torque signals to the motor, so that hydraulic oil of an oil outlet of a rotary motor pushes a recovery motor, due to the fact that the motor has a certain rotation speed, the motor can quickly response to the torque of the recovery motor to generate and store electricity, pressure reduction of a braking opening of the rotary motor is reduced, overflow loss is reduced, the maximum rotation speed of the motor is improved, electricity generating time is lengthened, and maximum efficient rotation braking energy recovery is achieved.

Description

technical field [0001] The invention relates to a control method for recovering the slewing braking energy of an excavator. Background technique [0002] With the increasingly serious problems of energy shortage and environmental pollution, research on energy saving, emission reduction and new energy development of construction machinery has become an urgent and realistic problem for major manufacturers. The hydraulic excavator has become the main object of people's attention due to its large quantity, high fuel consumption and poor emission. [0003] Hydraulic excavators are widely used in the construction industry due to their high efficiency and reliability. In their typical fixed-point excavation and rotary soil unloading conditions, there are two rotations and two brakings in one excavation cycle. Among them, the rotary kinetic energy is all converted into heat energy loss, and at the same time, it causes the temperature of the hydraulic oil to rise, reducing the servi...

AI Technical Summary

Problems solved by technology

[0005] In terms of recovery of hydraulic excavator slewing braking energy, there is a method for judging the motion state of the boarding platform based on the pressure difference between the inlet and outlet of the slewing motor to identify the acceleration and deceleration braking process of slewing start, but this method needs to be controlled by the slewing motor. It can only be judged after the pressure of the moving port is established. Compared with the actual rotary motion state of the boarding platform, there is a certain lag, which will affect the energy recovery effect of the rotary braking working condition with a short motion period.

Similarly, when using the motor to generate electricity to recover the slewing braking energy, the previous method is to judge that the slewing of the boarding platform is in the braking state before the system issues an instruction to start the motor, and does not consider the process of the motor turning from a static state to a power generation state. (The speed is increased from zero to the high-efficiency working speed area), and the lag with the actual state of the slewing brake also greatly reduces the energy recovery efficiency

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