Study Power Matching And Energy Saving Of Hydraulic Excavator With Cylinder Deactivation Power System

Presently, energy-saving hydraulic excavators study is mainly reflected in improving the performance of diesel engine and hydraulic components, improving the hydraulic system and improving power match among diesel engine, hydraulic system and actuators. But because the big variable load in frequent, the diesel often works under the condition of high speed and low load, the fuel consumption is high. So to improve the economical efficiency of the fuel engine and to induce the consumption of the whole machine, the energy management thought that is to control the operating state of the diesel engine’s cylinder is put forward.The basic components and working condition of the hydraulic excavators are analyzed. The main technical parameters of the machine (YC60-7made of yu-chai) are described in this paper. The working principal of constant output pump is elaborated adopted by the research prototype. Because system LUDV pressure-compensated valve is behind multi-way valve, when the rate of flow of the system saturated, the oil supply of oil hydraulic pump cannot meet the demand of excessive executive components need. The differential pressure between the head and the end of all the orifices becomes relatively lighter. That makes differential pressure keeping equal while the rate of flow of all the excessive executive components still depends on the opening area, it is widely used in small hydraulic excavator, so considering the relevant parameter of the multi-way valve, oil hydraulic pump, and hydraulic executive components of the prototype, systematic model of oil hydraulic excavator is set. Speed, load and speed regulation characteristics of the diesel engine are analyzed, the dynamic and economic leading indicators and the ability to overcome outer laden of the diesel engine. If we use math model of diesel engine set up by differential equation, the simulation precision is high, but the workload is too heavy and the result is too difficult to analyze. So here software AMESim is used to set the model. IEP-Engine component library is used to set precise diesel engine model. And the relative characteristics of the hydraulic excavator are emulation ally analyzed by setting system parameter.The kinematics analysis and state identification of all the working devices during the working process of the hydraulic excavator are important components of hydraulic excavator working analysis. Stating and judging the working state and load of the overall unit effectively is a crucial precondition to make the cylinder optimize the hydraulic excavator’s diesel engine working area, so to achieve hydraulic excavator’s working state identification is one of the aim of this paper. Presently there are two methods to do it:one is to state the outline and the characteristics of the working condition of the hydraulic excavator by image processing. The other one is to estimate the load by managing the pressure value of the hydraulic excavator system. The first one is lack of effective judgment of the function relation between the scraper pan and the working medium while the second one is lack of effective statistics of the working devices pose. Under the same pose, the pressure value of the hydraulic system is different because the objects are different, even empty. Here all the working devices poses of the hydraulic excavator and the pressure of the hydraulic system are combined to identify the working statement of the hydraulic excavator. That is by excavator slewing motor, bucket cylinder, bucket rod oil cylinder, the movable arm cylinder cavity pressure sensor installation, testing the pressure determining the load excavator digging size. At the same time install displacement sensor at three cylinders to detect the oil cylinders piston displacement in order to achieve the tracking of the working devices motion trajectory.On account of hydraulic pump-diesel engine matching scheme have the problem of high fuel consumption when the hydraulic excavator works under low load as well as the engine works under high speed, low load condition, the saving technology of stopping the diesel engine cylinder is adopted in this paper. Theoretical analysis of fuel consumption of a whole operating cycle combined with the engine universal performance characteristics map when the engine works under all cylinder or one deactivation, the fuel saving mechanism about cylinder deactivation is clear. On the basis of the fuel saving mechanism about cylinder deactivation, the fuel consumption of a whole operating cycle and changing law of parameters of Dynamic System, the fuel-saving control strategy about cylinder deactivation based on complete appliance condition identification is advanced.On the basis of fuel-saving control strategy about cylinder deactivation, we carry out the comparison test and analysis about excavator power performance and economical about the boom down, no-load rotating conditions. In practical work, hydraulic excavator often appears short-term state to stop working, but not to stop the diesel engine. So in such the state, the auto-idling technology for hydraulic excavator is used to reduce fuel consumption,but this fuel consumption is out of doing work, it is necessary to minimize idling fuel consumption. In this study on hydraulic excavator diesel engine idling work cylinder deactivation, economic comparison test are operated.Considering the feature of long time and high fuel consumption rotating, we carry out the test about roting and do the economic experiment using the technology of cylinder deactivation when the machine worked under the condition of full load and small moment of inertia of rotating.The test results showed that it helps diesel energy working quite close to high efficiency area and on the premise of function, it decreases fuel consumption.