Abstract
This paper compares the energy economy and vertical vibration characteristics of in-wheel drive electric vehicles (IEVs), in-wheel drive electric hydraulic hybrid vehicles (IHVs) and centralized drive electric vehicles (CEVs). The dynamic programming (DP) algorithm is used to explore the optimal energy consumption of each vehicle. The energy economy analysis shows that the IEV consumes more energy than the CEV due to its relatively lower electric motor efficiency, even with fewer driveline components. The IHV consumes much more energy than the IEV and CEV because of the energy loss in the hydraulic driveline. The vertical vibration analysis demonstrates that both IEV and IHV degrade the vehicle driving comfort due to increased unsprung mass. Taking the advantage of high power density of the hydraulic motor, IHV have less unsprung mass when compared with the IEV, which helps to mitigate the vibration problems caused by increased unsprung mass.
Highlights
Introduction and Hydraulic inWheel DriveTransportation electrification is an important solution for environmental degradation and non-renewable energy shortage problems
in-wheel drive electric hydraulic hybrid vehicles (IHVs) hasare similar vehicle dynamic shown that the rear covers most of the driving torque, which means the powertrain performance with the centralized drive electric vehicles (CEVs) and in-wheel drive electric vehicles (IEVs), the in-wheel hydraulic motors (IHM) power is selected to be close to the in-wheel electric motors (IEM)
By the energy management strategy designed with the dynamic programming (DP) algorithm, the IEV and IHV
Summary
Transportation electrification is an important solution for environmental degradation and non-renewable energy shortage problems. The multi-gear and multi-motor powertrains are widely researched in academia with the motivation of improving the electric vehicle energy economy and dynamic performance. Wheels have to work under like In in contrast, water or off hydraulic system is more reliable in these complex working conditions These advantages road, which proposes challenges for the high voltage electrical system. The hydraulic draulic system is more reliable in these candidate complex working conditions These advantages motor has been used for vehicle driving in massive researches combined with electric make the hydraulic motor a potential candidate for in-wheel drive [18]. The motor energyis economy and vertical vibration characteristics of as thetheIHV are the hydraulic used for in-wheel drive and an electric motor is used power compared the IEV and a vertical centralized drivecharacteristics electric vehicle (CEV).
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