Energy-saving Hydraulic Excavator Computer Control System

The hydraulic excavator is a kind of high-power construction equipment, and the energy saving control will directly affect the economics and reliability of the excavator. The purpose of this paper is to study the energy saving control system of the hydraulic excavator and to achieve the aim at improving efficiency, saving fuel.First of all, the purpose of the study on the energy saving control of excavators is introduced. The paper gives the investigation of the electronic energy-saving control system in detail, including the main contents and the development trend of the project.For the sake of energy saving control research, a hydraulic excavator electronic energy-saving control model is established based on CAN-bus technique, which included motive and examined system. The electronic throttle adjustment is used in Diesel engine. That is issued by the controller throttle control signals to the executive motor, driven throttle drawbars adjustment of supply to meet the needs of power and speed. Hydraulic systems can be divided into the main hydraulic circuit and guiding hydraulic circuit in two parts. In the hydraulic circuit of various integrated hydraulic system, and they are able to carry out energy-saving control. Electronic detection system controller will be assigned to the appropriate parts, and they are linked by using CAN bus.The hardware system is designed as two parts in detail: the main controls unit(the control of the hydraulic pressure pump), the accelerograph controller unit(accelerograph position control), and discusse the role of the various parts. The position closed-loop control is used for engine control. The electronic control unit of the engine includes: microcontrollers, photoelectric isolation, power amplification and throttle actuator drive circuit. For variable pump control, a speed sensor is used for closed-loop control. It is divided into: mainframe computer system, input and out put analog / digital (A / D) converter, loading, variable adjustment, pressure and speed measurement and signal amplification, and other subsystems. The composition of the hardware is given in detail, and the functions of the various parts and principles are described.The algorithm of the diesel engine model and accelerograph actuator model are mainly studied. The engine speed control on the different working conditions are given, a improved double closed-loop PID control on speed and throttle position and a load feedforward control method are used. load feed forward control is applied to the input of the control system. It can compensate the impact of the load changes on the control output, and always keep the engine speed in a certain area, so that the engine always works in a specified condition.Finally the experiments are carried out. The purpose and the contents of the energy-saving test were expatiated. The composition of energy test bed and the text apparatus are introduced, and the collection in data,the use of the software, and data processing methods are given. The collected data are processed and analyzed after the approved test of the physics terms was completedIn conclusion, the saving-energy theories and method are practical.The electronic energy-saving control system of the excavation machine can realize the energy-saving control. This can enhance the level of the hydraulic excavator automation , strengthen the market competition ability and saving energy. The methods are important in theory and practice.