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Loaders are widely used in the construction of earthworks for construction projects. Due to the large volume and mass of these machines, they have shortcomings such as low driving efficiency and high energy consumption. To address these shortcomings, this work applied eclectic drive technology to a loader’s traction system. A wheel electric drive s...
Context in source publication
Context 1
... was necessary to design the structure of the SRD and develop the control algorithm. As shown in Figure 4, the SRD was mainly composed of an SRM, a power converter, a controller and a position and current detector. When the SRD operates and system conditions (voltage, current and temperature) are normal, the main controller receives local or remote commands, calculates the angle position of the motor rotor according to the position signals provided by the position sensor and then accordingly outputs power circuit control signals with a boot logic. ...
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Citations
... In order to address emission problems, the power of ASVs was improved with hybrid or pure electric power structures [19]. For hybrid power ASVs, the diesel engine is used to drive the generator, and the battery, supercapacitor, or both are used to store the energy However, the kinematics and dynamics of ASVs are quite different from those of conventional commercial vehicles. ...
... In order to address emission problems, the power of ASVs was improved with hybrid or pure electric power structures [19]. For hybrid power ASVs, the diesel engine is used to drive the generator, and the battery, supercapacitor, or both are used to store the energy of the power system [20]. ...
... During steering maneuvers, the speed difference between the inner and outer wheels is very large; therefore, the differential mechanism is necessary for the drive axle of this ASV. According to this principle, the model of the differential mechanism can be expressed as (19) where J in , J l , and J r are the rotational inertia of the input axle, left output axle, and right output axle, respectively; T in , T l , and T r and ω in , ω l , and ω r are the corresponding torques and angular velocities. c denotes viscous damping. ...
Articulated steering vehicles (ASVs), with brilliant maneuverability and efficiency, are being widely applied in mining, construction, agriculture, and forestry. However, their special structures result in them having complex dynamic characteristics, but there are no reliable models for further research. This study established a simulation platform with the dynamic model of ASVs, where the subsystems of the power train, steering systems, tires, and frames were also included. The dynamic model was validated with field test data of typical working cycles, in which the focus was on longitudinal and lateral motions and the characteristics of steering and power train systems. Then, the distribution of hydraulic and drive power was revealed using the simulation platform and test data. For a load–haul–dump (LHD) vehicle with a 6 m3 capacity, the maximum power of the system was about 289 kW; the power of the motor accounted for the majority of the power at the beginning stage of loading, being about 74%, and then the hydraulic power dominated in the later stage of loading. During the transport stage, the power of the motor accounted for about 79% of the total power. Finally, the influence of the dynamic parameters on lateral and longitudinal motions was analyzed based on the validated platform.
The difference in power demand and the driver's operation in various operation stages make the loader have the problem of low energy utilization. Changeable operating objects and drastically changing loads have exacerbated the difficulty of energy-saving research in different operating stages of loaders. Therefore, based on identifying the operation stage and analyzing the load characteristics under typical working conditions of the loader, this paper proposes a shovel-loading cooperative control strategy. Specifically, the Drag Reduction Insertion (DRI) in the shoveling stage is realized based on learning the driving intention. Based on different operation stages, the load characteristics of different materials for shovel-loading are deeply analyzed, and the prediction research of the power output characteristics of the power unit is carried out. The shovel-loading cooperative control solves the problem of the poor economy caused by different power requirements in different operation stages and significantly reduces the impact of the driver's operating experience.
