Performance Match And Simulation Of Input Spilt Hydraulic Hybrid Drivetrain

Hydro-mechanical variable Transmission (HMT) has great foreground in heavy-dutyvehicles due to its characteristics of variable speed regulation and high efficiency.Hydraulic Hybrid Vehicle (HHV) composes of Hydro-mechanical variable Transmissionand energy storage element, as one of HHV types, has drawn more and more attention asthe increasing deficiency of petroleum resources and the worsening pollution ofenvironment these years.Taken some car as a model, this paper provides theory support for the HHVtechnology, which makes variable transmitting and regenerative braking available. HHVbased on HMT is studied in this paper. The main content includes:(1)After analysis of speed ratio characteristic and torque characteristic of potentialprograms, single-shift-input-spilt HHV system is adopted, which is proved that thisprogram satisfies the requirements of dynamic and braking performance. (2)By thededuction of vehicle dynamic equations at several operating modes, the parameters of themain devices are determined and the influence of different parameters are researched andsimulated. (3)The mathematic models of HHV are built and energy recovery and reusageare simulated in MATLAB/SIMULINK, at modes of different braking deceleration.(4)Braking control strategy is introduced and regenerative braking is simulated to ensurethe ride comfort and safety. Changing rules of pump/motor are obtained by simulating.From simulation consequence, this design is proved to reduce the engine rating power in alarge scale and produce a remarkable effect on improvement of the fuel economy.Therefore, the single-shift-input-spilt HHV is suitable for the vehicles that ride in urbancities, stop and restart in high frequency.