Abstract
Keywords: Motor vehicle, hydraulic hybrid, brake, energy recovery.
Currently, there is a need for alternative propulsion systems to ensure the requirements of pollution and consumption, particularly in the urban environment. The paper presents two hydraulic schemes and analyzes traction, consumption and pollution aspects. The analysis is done using a multibody simulation program, which allows analysis of the whole propulsion system - considering the vehicle operating conditions. A mechanical propulsion system is considered as reference. There are considered the hydraulic solution with constant and variable pump. Preliminary simulation demonstrate the potential of significantly reduction of emissions even for hydraulic hybrid propulsion system with a constant volume hydraulic pump, where vehicle speed control is obtained controlling engine speed.