Method and device for controlling discharging of hybrid excavator

Abstract

The invention provides a method and device for controlling discharging of a hybrid excavator. The method comprises the steps that after it is determined that a halt request exists, an electric power system halt command and an electric power system discharging command sent by a completer machine controller are received; according to the electric power system discharging command, and the rotating speed of an electric generator and an engine correspondingly connected with a capacitor is improved through the capacitance in an electric power system to discharge the capacitor; and after it is determined that a voltage value of the capacitor is lower than a preset threshold value, the electric power system is shut down according to the n electric power system halt command. According to the methodand device for controlling the discharging of the hybrid excavator, potential safety hazards brought by high voltage can be avoided when the hybrid excavator is shut down.

Description

technical field [0001] The present application relates to the field of control technology, in particular, to a method and device for controlling the discharge of a hybrid excavator. Background technique [0002] Excavators are one of the main machinery in the field of construction machinery. With the development of the economy and the improvement of the national economy, the market for excavators is increasing, and the working environment of excavators is generally in places with harsh environments such as mines and fields. In excavation operations, the load of the excavator changes very drastically, periodically switching from no-load to full-load, or even overload, and the change of load will cause the engine's torque to fluctuate sharply, and the speed also fluctuates greatly, so the engine often works at Transient conditions result in poor fuel economy and emissions. [0003] In order to improve fuel economy and emissions, excavators with gasoline-electric hybrid techno...

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Problems solved by technology

[0002] Excavators are one of the main machinery in the field of construction machinery. With the development of the economy and the improvement of the national economy, the market for excavators is increasing, and the working environment of excavators is generally in places with harsh environments such as mines and fields. In excavation operations, the load of the excavator changes very drastically, periodically switching from no-load to full-load, or even overload, and the change of load will cause the engine's torque to fluctuate sharply, and the speed also fluctuates greatly, so the engine often works at Under transient conditions, resulting in poor fuel economy and emissions

[0003] In order to improve fuel economy and emissions, excavators with gasoline-electric hybrid technology can be used. In gasoline-electric hybrid excavators, the capacitor voltage value is generally several hundred volts to thousands of volts, which is already a very dangerous voltage. When the hybrid excavator is shut down, it will stop with electricity, so there is a very big safety hazard

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