Research On Energy Control Strategy For Parallel Hybrid Experiment Table

The hydraulic hybrid techniques was a new energy-saving technique appearedafter the electric hybrid technique. With the advantages of great power density andreliability, the hydraulic components could save the energy of moving vehicle into theaccumulator in the form of hydraulic during the process of breaking. This technologycould ensure the engine of vehicle operating at low fuel consumption zone in the mostof the time. Through which way to improve vehicle fuel economy greatly.In order to study the characteristics of parallel hydraulic hybrid system, based ona type of vehicle, a experiment table would be made. After a reasonable mathematicalmodel was established, main elements were selected. Then a torque distributioncontrol strategy fitting this bench was proposed. In order to achieve maximumincrease vehicle fuel economy, different control strategies were put forward based onbraking mode and drive mode. According to the intensity of the breaking conditionbraking modes were divided into mild brake, moderate brake and severe brake.According to different conditions optimal braking energy recovery strategy wasproposed for the drive mode, energy control strategy basing on logic threshold wasproposed. The drive mode was select according to the logic threshold, therebyensuring the engine working in the high efficiency zone mostly.A control model basing on AMESim was established, and several typicaloperating conditions of hybrid system are simulated to verify the rationality andeffectiveness of optimal energy recovery strategy and logic threshold-based energycontrol strategy.At last, the parallel hydraulic hybrid system was experiment on the tableoptimized according the simulation results. And several conditions were varied toexperiment the energy control system, including deferent vehicle speeds; deferentpump/motor displacements, deferent initial accumulator pressures, and so on.Experimental results show that the control strategy can effectively recover brakingenergy and keep the engine operating at the high efficiency zone, and this controlstrategy of Hydraulic-Hybird technique has practical value.