Study of the Energy Conversion Process in the Electro-Hydrostatic Drive of a Vehicle

Abstract

Abstract:In the paper, we describe a study of an electro-hydrostatic hybrid drive of a utility van intended for city traffic. In this hybrid drive, the electric drive is periodically accompanied by hydrostatic drive, especially during acceleration and regenerative braking of the vehicle. We present a mathematical model of the hybrid drive as a set of dynamics and regulation equations of the van traveling at a given speed. On this basis, we construct a computer program which we use to simulate the processes of energy conversion in the electro-hydrostatic drive. The main goal of the numerical simulation is to assess the possibility of reducing energy intensity of the electric drive through such a support of the hydrostatic drive. The obtained results indicate that it is possible to reduce the load on elements of the electric system and, therefore, improve energy conversion.

Research on Economic Comprehensive Control Strategies of Tractor-Planter Combinations in Planting, Including Gear-Shift and Cruise Control

“…However, the fuel economic gear-shift schedule is neglected [7]. From the economic as well as ecologic points of view, the reduction of fuel consumption in operating of tractor-implement combinations is considered as increasingly important [15,16]. The gear-shift schedule largely determines the economic performance of a vehicle with stepped transmission.…”