Research On Energy-saving Intelligent Control For Hydraulic Excavators Based On DSP

Hydraulic excavator is a versatile engineering machinery, which has been widely applied in airports, ports, railways, highways, mining, oil reservoir, and defense project, and so on. But its energy efficiency is low, and the energy loss is so huge that the attention of the development of hydraulic excavator will be focused on energy-saving.By analyzing the main energy loss of hydraulic excavator, this paper puts reducing energy losses caused by the power of diesel engine and variable pump matching unreasonable as the focus. In this paper, I analysis and research the coordinated control principle of constant power and variable power of the power system in different conditions and the power matching method to determine the parameters. Based on this theory, I develop a system of energy saving, and design the Controller module for diesel engine speed and variable pump power. As we all know, in traditional control algorithm, the diesel engine accelerator and pump regulator can not able to be controlled accurately in power matching control. In view of the this conditions, a intelligent control algorithm of fuzzy neural network is introduced to the energy-saving system, so that the controller can control the diesel engine accelerator and the pump regulator precisely according to the load variations, and achieve the target of power coordination, and establish the mathematical model of the system simulated by MATLAB.On the basis of energy-saving control system, a hydraulic excavator energy control scheme is proposed according to the structure and properties of DSP. In the plan, the chip TMS320F2812 is used as the main control chip, and constitute the closed-loop control system according to speed detection circuit. Through rotational speed and sent for diesel engine respectively and variable pump control. The hardware and software of the excavator energy-saving controller are analyzed overall. In the aspect of hardware, I mainly complete the design of the stepping motor driver circuit, liquid crystal display circuit, keyboard circuit, and photoelectric encoding speed measuring isolating circuit which are designed as peripheral; In software, C language is used for modular design, which contains the stepping motor driver subroutine, liquid crystal display subroutines, keyboard subroutines, A/D sampling procedures, speed collecting subroutine etc. Take advantage of powerful and convenient development environment of the CCS2.0, each subroutine and initialization procedures are debugged.