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Item Information   Holdings       More by this author     Hadj Kacem, Nabil     Subjects     Internal combusion engine -- Testing     Computer simulation     Hydraulic control     Fluid power technology     Mathematical models     Bond graphs     MSE Project.     Browse Catalog     by author:      Hadj Kacem, Nabil       by title:      Modeling, simulation...         MARC Display

Modeling, simulation and development of a controller strategy for hydraulic hybrid vehicle / by Nabil Hadj Kacem. by Hadj Kacem, Nabil Subjects Internal combusion engine -- Testing   Computer simulation   Hydraulic control   Fluid power technology   Mathematical models   Bond graphs   MSE Project. Description:  208 leaves : ill. ; 29 cm. Contents:  Advisor: Dr. John Lumkes, Jr. Committee members: Thomas Labus, Dr. John Pakkala. Introduction -- Background -- Modeling with Bond Graph -- Software tools -- Vehicle component models -- Vehicle controller strategy -- Conclusions and future work -- Appendix A) Bond graph B) Engine pump model C) Wheel pump motors D) Data for Zetec IC engine brake specific fuel consumption E) Conversion factors F) Final PowerPoint presentation. Project objective: Energy conservation is an important topic in the 21th century since the energy consumption is on the rise and the natural resources are in decline. Saving energy that is normally wasted is an attractive topic. Control of the vehicle's engine and transmission and recapturing braking energy, normally wasted, can result in improved vehicle fuel efficiencies and a cleaner environment. A normal internal combustion engine powered vehicle with a hydrostatic transmission offers the possibility to incorporate energy storage (accumulator), four-wheel-drive, and an infinitely variable transmission. While the hydrostatic transmission is known for low efficiencies due to the combined hydraulic and mechanical losses, careful computer control can lead to attractive overall fuel efficiency and lower emissions. The computer controls the engine throttle and the displacements of the engine pump and wheel pump-motors. The engine is turned on during high power driving and to recharge the accumulator which intermittently drives the vehicle and captures energy normally lost during braking. Methodology: Objected Oriented Software, 20-Sim, is utilized to model and simulate the vehicle driving through the Federal Urban Drive Cycle (FUDC). The engine operating map, the engine pump, wheel pump-motors, and accumulators and the vehicle body are modeled. The engine pump and wheel pump-motors are modeled using Bond Graph representation. The vehicle body and the accumulator are modeled with equation models. Block diagram representation is used to represent the engine operating map and the FUDC. Conclusions: In order to obtain the best fuel efficiency, the engine needs to be operated along the line of lowest fuel consumption. Also the engine needs to be turned off while the vehicle is stationary. The task of the internal combustion engine is to charge the accumulator and to drive the vehicle only if full power is desired. Driving the vehicle with lower system pressures leads to more than 30% fuel savings.   Copy/Holding information Location Collection Call No. Status   Walter Schroeder Library Master's Theses AC805 .H33 2004 Available Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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