OPTIMIZATION OF A PASSENGER HYDRAULIC HYBRID VEHICLE TO IMPROVE FUEL ECONOMY

In a hybrid hydraulic vehicle, the hydraulic accumulator is used as the secondary power source in addition to the engine to propel the vehicle. Since the accumulator is a passive power source, it will be only used to compensate the difference between the power demand and the power delivery by the engine. Obviously, the main energy consumption is the engine. Hence a straightforward strategy to improve the fuel economy is to reduce the engine operating period. In contrast, because of the low energy density characteristic, the accumulator can only afford the required power in a short period. As a consequence, the hydraulic hybrid vehicle has been concluded only suitable for start-stop-and-go driving pattern. This paper present different rule-based control schemes for a 3.5- ton series hydraulic hybrid truck. The simulation results indicate that by applying suitable control scheme, the proposed series hydraulic hybrid system offers improvements of fuel economy for both urban and highway driving condition. The improvement is of 42.67% and 36.56% for urban and highway driving conditions, respectively in comparison with the corresponding conventional vehicle.

Download Full-text

Thermostatic Control for Series Hydraulic Hybrid Vehicle (SHHV) Energy Management

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.512-515.2676 ◽

2012 ◽

Vol 512-515 ◽

pp. 2676-2681 ◽

Cited By ~ 3

Author(s):

Ding Gen Li ◽

Dai Wei Feng

Keyword(s):

Fuel Economy ◽

Hybrid Vehicle ◽

Management Control ◽

Medium Size ◽

Thermostatic Control ◽

Power Train ◽

Hydraulic Hybrid ◽

Series Configuration ◽

Hydraulic Hybrid Vehicle ◽

Basic Features

The main contributions of this paper are the development of forward-facing model of a series hydraulic hybrid vehicle (SHHV) power-train for medium size trucks, of which the fundamental architecture is described, together with dynamic equations and basic features of subsystem modules. A thermostatic SoC supervisory power management control algorithm is assessed, with the expectation that series configuration would maximize the fuel economy as engine is decoupled from the wheels. Simulation results over the urban driving cycle represent a significant departure from the conventional wisdom of operating the engine near its sweet spot and indicate what is preferred from the system stand-point, and also demonstrate the potential of the selected hybrid system to substantially improve vehicle fuel economy.

Download Full-text

Implementation of an optimal control strategy for a hydraulic hybrid vehicle using CMAC and RBF networks

Scientia Iranica ◽

10.1016/j.scient.2012.02.019 ◽

2012 ◽

Vol 19 (2) ◽

pp. 327-334 ◽

Cited By ~ 12

Author(s):

A. Taghavipour ◽

M.S. Foumani ◽

M. Boroushaki

Keyword(s):

Optimal Control ◽

Control Strategy ◽

Hybrid Vehicle ◽

Optimal Control Strategy ◽

Rbf Networks ◽

Hydraulic Hybrid ◽

Hydraulic Hybrid Vehicle

Download Full-text

Predictive Energy Management for Parallel Hydraulic Hybrid Passenger Vehicle

ASME 2010 Dynamic Systems and Control Conference, Volume 2 ◽

10.1115/dscc2010-4105 ◽

2010 ◽

Cited By ~ 7

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.

Download Full-text