Hydraulic hybrid powertrain design proposal for passenger vehicles

In this study, an analysis is carried out on the transmission systems of current hybrid vehicles and the presentation of a preliminary transmission design for a hybrid passenger vehicle with an internal combustion engine combined with a hydraulic pressure accumulator. This second system allows the kinetic energy dissipated by conventional vehicles to be stored and reused, increasing the vehicle's efficiency. The environmental impacts caused by the increase in polluting gases in the atmosphere have pressured governments in several countries to demand greater efficiency from passenger cars. The response from automakers has been the electrification of their fleets, whether complete or hybridization, which has proven to be a more feasible and cheaper alternative in the short term. However, electric batteries are still expensive and lose efficiency significantly with charge and discharge cycles. Thus, the proposal for an innovative hybrid could be another alternative to reduce the impacts of vehicles and passenger transport on the environment. To achieve the objectives of this work, a study was carried out on current hybrids with a focus on transmission, different hybrid powertrain architectures were defined, proposals for vehicles that use a hydraulic pressure accumulator were analyzed and a preliminary design of a propulsion system for a vehicle was presented. In the end, in addition to compiling several studies on the subject, a hybrid propulsion system configuration was proposed for a passenger vehicle based on the Jeep Commander 2022.