Modeling of a Series Hybrid Hydraulic Drivetrain for a Light-Duty Vehicle in Hopsan

Abstract

Hydraulic hybrids continue to receive attention as a possible solution in the search for improved fuel economy for different vehicle types. This paper presents the development of a framework for hybrid hydraulic vehicles, using the Hopsan simulation tool of Linköping University's Division of Fluid and Mechatronic Systems (Flumes). This framework is then used on a series hydraulic hybrid transmission which employs a pump control based on the hydraulic accumulator's state-of-charge (SoC). Several simplifications were made, especially concerning mechanical components. Simulation over two urban standard cycles shows promising results concerning velocity error and energy recuperation potential, provided the components are sized appropriately to compensate for the mechanical limitations. This paper lays the foundation for the further development of a design framework suitable for optimizing the full drivetrain, including component sizing and controller parameterization.

Experimental Assessment of Water Hammer-Induced Column Separation in Oil-Hydraulic Pipe Flow

“…Hopsan has previous been used successfully to model e.g. aircraft systems [21] and hybrid hydraulic drivetrains [22]. Hopsan only solves for the impedance and wave variables of the TLM elements.…”

Modelling and experimental validation of the performance of a digital displacement® hydraulic hybrid truck

“…6 Light goods trucks are defined here as commercial vehicles with a fully laden mass of 6600 kg or less and which have a separate cab and cargo compartment, unlike a van. Previous research has investigated electric [7][8][9][10] and series hydraulic hybridisation [11][12][13][14][15][16] of similar vehicles. However, previous research has focussed on simulation models or engine-in-the-loop 17,18 experiments to validate the model and evaluate the system benefits.…”