Electric energy control method of construction machinery and construction machinery

Abstract

The invention discloses an electric energy control method of construction machinery and the construction machinery, and belongs to the technical field of construction machinery. The electric energy control method of the construction machinery comprises the following steps: collecting a principal pressure value of a hydraulic pump and a current value of a proportional valve, wherein the proportional valve is connected with the hydraulic pump, and calculating output torque of the hydraulic pump; calculating and setting a maximum voltage value of a super-capacitor; judging that the super-capacitor is not charged to reach to the maximum voltage value, and generating torque of a generator motor; and carrying out torque output of the generator motor, wherein changes of the torque of the generator motor are inversely proportional to changes of the torque of the hydraulic pump. According to the electric energy control method of the construction machinery and the construction machinery, the maximum value of the super-capacitor is judged, generation of the torque of a drive motor and the torque output of the hydraulic pump are in synchronous control, then output of the drive motor is carried out, the super-capacitor is maintained in a stable range, and meanwhile the condition that the drive motor and the hydraulic pump simultaneously serve as engine loading is avoided, and thus the condition of overload of an engine is avoided.

Description

technical field [0001] The invention relates to the technical field of construction machinery, in particular to an electric energy control method of the construction machinery and the construction machinery. Background technique [0002] In a hybrid vehicle including an engine and a generator motor connected to each other as a drive source, various attempts have been made to control the power generation of the generator during operation. [0003] Conventionally, in order to realize miniaturization and long life of a capacitor as an electrical storage device, power generation control is performed by changing a target storage amount of the capacitor based on various energies of working machines. [0004] However, if the charging state of the supercapacitor is simply considered regardless of the load, it is possible that when the main pump load is large, the generator / motor also acts as a load and the engine is overloaded, which has a serious impact on the fuel consumption and ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem that the capacitor voltage is unstable during the power generation control process of the current electric hybrid construction machinery, which affects the service life of the capacitor, and when the main pump load is large, the engine is overloaded and the performance of the whole machine is affected, a construction machinery is now provided. Electric energy control method and construction machinery

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