No abstract

No abstract

No abstract

In order to accurately estimate the residual capacity of battery in hybrid devices, the definitions of the residual capacity in variable current and its modified formula under the actual working condition are given. The data samples of the residual capacity are obtained from the input signals which come from the power curve of a parallel hybrid excavator being scaled down to the range of a single battery. Based on the analysis of several grey prediction algorithms on the samples, a fragmentation prediction scheme is proposed that the direct grey prediction model of the cumulative - average operator is adopted at the charge stage, and the grey prediction model of the variable weight buffer factor at the discharge stage. The result shows that the proposed method can fully and effectively improve the accuracy of prediction for the residual capacity of battery in hybrid devices.

The flow distribution side plate (FDSP) of the intra-vane pump is loaded to the hydraulic thrust of the oil film of the distribution pair and the hydraulic pressing force of the kidney-shaped cavity on the end cover of the pump core. The kidney-shaped cavity structure in the end cover has a certain effect on the deformation of the FDSP, and then affects the oil film thickness, leakage power loss and friction power loss of the distribution pair. In this paper, the hydraulic pressure distribution of oil film in the distribution pair is studied. Using the principle of redundant squeezing force, the calculation formula for the kidney-shaped cavity area on the end cover is deduced. Through simulation, the contour of the deformation of the FDSP is obtained, and it is found that the deformation of the discharge area and the oil suction area is not uniform. By improving the design of the kidney-shaped cavity structure in the end cover, the uniformity of the FDSP deformation can be achieved. The research conclusion has certain guiding significance for improving the volume efficiency and mechanical efficiency of the intra-vane type pump.