Nonlinear Power Balance Control of a SPA hydraulic hybrid truck

An integrated procedure for mathematical modeling and power control balance for a SPA (split parallel architecture) hydraulic hybrid vehicle is presented in this paper. Dynamic mathematical model of the powertrain is constructed firstly, which includes five modules: diesel engine, traction motor, starter, loading pump and accumulator. Based on the mathematic model of control modes a stability analysis is done. For some control modes a sliding mode control is designed, which uses full-states closed-loop feedback. The paper finally illustrates and discusses the results of simulation. The results show that the performance and stability of control modes are proper and a power control strategy can be designed to reduce the consumption even more than the presented control.