scholarly journals Simulation-Based Optimization of a Series Hydraulic Hybrid Vehicle

2018 ◽  
Author(s):  
Katharina Baer
Keyword(s):  
Hybrid Vehicle ◽  
Hydraulic Hybrid ◽  
Simulation Based ◽  
Simulation Based Optimization ◽  
Hydraulic Hybrid Vehicle

Aspects of Parameter Sensitivity for Series Hydraulic Hybrid Light-Weight Duty Vehicle Design

2016 ◽  
Author(s):  
Katharina Baer ◽  
Liselott Ericson ◽  
Petter Krus
Keyword(s):  
Design Parameters ◽  
Drive Cycle ◽  
Hydraulic Hybrid ◽  
Component Sizing ◽  
Alternative Approach ◽  
Simulation Based ◽  
Simulation Based Optimization ◽  
Hydraulic Hybrid Vehicle ◽  
Definition Of ◽  
And Control

Hybridization of a vehicle’s drivetrain can in principle help to improve its energy efficiency by allowing for recuperation of kinetic energy and modulating the engine’s load. How well this can be realized depends on appropriate sizing and control of the additional components. The system is typically designed sequentially, with the hardware setup preceding the development and tuning of advanced controller architectures. Taking an alternative approach, component sizing and controller tuning can be addressed simultaneously through simulation-based optimization. The results of such optimizations, especially with standard algorithms with continuous design variable ranges, can however be difficult to realize, considering for example limitations in available components. Furthermore, drive-cycle based optimizations are prone to cycle-beating. This paper examines the results of such simulation-based optimization for a series hydraulic hybrid vehicle in terms of sensitivity to variations in design parameters, system parameters and drive cycle variations. Additional relevant aspects concerning the definition of the optimization problem are pointed out.

scholarly journals Framework for Simulation-Based Simultaneous System Optimization for a Series Hydraulic Hybrid Vehicle

2019 ◽  
pp. 27-52 ◽  
Author(s):  
Katharina Baer ◽  
Liselott Ericson ◽  
Petter Krus
Keyword(s):  
Problem Formulation ◽  
System Optimization ◽  
Hybrid Vehicle ◽  
Systematic Evaluation ◽  
Hydraulic Hybrid ◽  
Trade Offs ◽  
Simulation Based ◽  
Light Duty Vehicle ◽  
Hydraulic Hybrid Vehicle ◽  
The Impact

Hybridization of hydraulic drivetrains offers the potential of efficiency improvement for on- and off-road applications. To realize the advantages, a carefully designed system and corresponding control strategy are required, which are commonly obtained through a sequential design process.Addressing component selection and control parameterization simultaneously through simulation-based optimization allows for exploration of a large design space as well as design relations and trade-offs, and their evaluation in dynamic conditions which exist in real driving scenarios. In this paper, the optimization framework for a hydraulic hybrid vehicle is introduced, including the simulation model for a series hybrid architecture and component scaling considerations impacting the system’s performance.Anumber of optimization experiments for an on-road light-duty vehicle, focused on standard-drivecycle- performance, illustrate the impact of the problem formulation on the final design and thus the complexity of the design problem. The designs found demonstrate both the potential of energy storage in series hybrids, via an energy balance diagram, as well as some challenges. The framework presented here provides a base for systematic evaluation of design alternatives and problem formulation aspects.

Predictive Energy Management for Parallel Hydraulic Hybrid Passenger Vehicle

2010 ◽  
Author(s):  
Timothy O. Deppen ◽  
Andrew G. Alleyne ◽  
Kim A. Stelson ◽  
Jonathan J. Meyer
Keyword(s):  
Energy Management ◽  
Hybrid Vehicle ◽  
Management Problem ◽  
Transfer Energy ◽  
Hybrid Powertrain ◽  
Engine Torque ◽  
Engine Simulation ◽  
Hydraulic Hybrid ◽  
Displacement Pump ◽  
Hydraulic Hybrid Vehicle

In this paper, a model predictive control (MPC) approach is presented for solving the energy management problem in a parallel hydraulic hybrid vehicle. The hydraulic hybrid vehicle uses variable displacement pump/motors to transfer energy between the mechanical and hydraulic domains and a high pressure accumulator for energy storage. A model of the parallel hydraulic hybrid powertrain is presented which utilizes the Simscape/Simhydraulics toolboxes of Matlab. These toolboxes allow for a concise description of the relevant powertrain dynamics. The proposed MPC regulates the engine torque and pump/motor displacement in order to track a desired velocity profile while maintaining desired engine conditions. In addition, logic is applied to the MPC to prevent high frequency cycling of the engine. Simulation results demonstrate the capability of the proposed control strategy to track both a desired engine torque and vehicle velocity.

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