In pure electric vehicles, frequent starting and braking conditions lead to a reduction in battery lifespan. The adoption of an “electric-hydraulic” hybrid power system can effectively mitigate this issue. However, the increase in vehicle mass due to the integration of hydraulic systems may affect the overall efficiency of the vehicle.
Finally, the optimization results indicate that electric hydraulic hybrid vehicle powertrain architectures can be a very attractive propulsion technology regarding both sustainable and economical aspects, effectively reducing battery aging by the use of a high power density hydraulic accumulator, which acts as a peak power buffer unit.
Both vehicle configurations were optimized under the same driving cycles and the electric hydraulic hybrid vehicle demonstrated cost by driving range ratio improvement up to 9.57% as compared to the HESS EV, which indicates that the electric hydraulic hybrid is a viable solution to immediate implementation of the electric fleet.
Hydraulic hybrids use many of the same principles as electric hybrids, but instead of using potentially pollutive (and heavy) batteries, they use lightweight components and clean fluid to power the vehicle while it's at slow speeds. Sound too good to the true?
A battery with high capacity is indispensable for improving acceleration and fuel efficiency for hybrid vehicles. This hybrid Li-ion battery delivers twice the power* compared to similarly sized conventional cells. As the output of the battery increases, so too does the acceleration.
The primary energy source of this hybrid vehicle model is an electric battery, which is connected to an electric motor responsible for driving the hydraulic pump. In this sense, the electric motor is decoupled from the vehicle wheel’s power demand, enabling its operation at higher efficiency regions.
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