The LETHE™ Gas Turbine Hybrid Prototype Vehicle of the University of Roma 1: Drive Cycle Analysis of Model Vehicle Management Unit

[+] Author and Article Information
R. Capata

Department of Mechanical & Aeronautical Engineering, University of Roma 1 “La Sapienza,” Roma, Italyroberto.capata@uniroma1.it

M. Lora

Department of Mechanical & Aeronautical Engineering, University of Roma 1 “La Sapienza,” Roma, Italy

EEC Directive 90/C81/01: this is a series of Regulations that prescribe both the emissions limits (adjusted every year) and the methods for testing and qualifying passenger and commercial vehicles. The test driving are in one urban cycle (European Cycle Emission) and an extra-urban driving mission (Extra-Urban Driving Cycle)

J. Energy Resour. Technol 129(2), 107-116 (Oct 25, 2006) (10 pages) doi:10.1115/1.2718581 History: Received July 04, 2006; Revised October 25, 2006

The paper describes the logic of the vehicle’s power management unit (VMU) for the prototype configuration of the LETHE™ (low emissions turbo hybrid electric) vehicle designed by the University of Roma 1. The theoretical and practical feasibility of the concept (a series hybrid in which the thermal engine is a small turbo-gas and the traction is fully electric) was demonstrated in a series of previous works by the same authors, and some experimental tests were conducted at the ENEA-Casaccia Laboratories on a small 45 kW gas turbine set, to investigate the performance of the propulsive unit (turbine plus batteries and electrical motor) under the European vehicular emission (ECE) tests. After successful completion of these tests, a further analysis was carried out to identify an optimal hybridization ratio with respect both to driveability and fuel consumption: the results led to the conclusion that such an absolute optimal configuration does not exist, because not only the system performance, but also the absolute and relative sizes (i.e., nameplate power) of turbines and battery pack depend largely on the type of the proposed driving mission of the car. In the final configuration discussed in this paper, the vehicle is equipped with an additional energy storage device, a compact ultra-fast flywheel, to partially compensate for the low recharge capability of the Pb-acid batteries and to exploit better brake recovery for futher reduction of the fuel consumption. The present status report describes the VMU control logic, the individual components of the propulsive system and the proposed chassis configuration for the prototype.

Copyright © 2007 by American Society of Mechanical Engineers
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Figure 2

Scheme of the LETHE propulsion system

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Figure 3

(1) GT set; (2) electric generator; (3) regenerator; (4) city car battery pack; (5) sedan battery pack

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Figure 4

Operational power range of the traction system under Logic A

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Figure 5

Operational power range of the traction system with the Logic B

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Figure 6

Scheme of the performed simulations

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Figure 7

(a) Battery state of charge (SOC) for a city car. (b) GT power supply for a city car. (c) Energy system balance for a city car. (d) Auxiliary unit energy stored for a city car.

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Figure 8

(a) Battery state of charge (SOC) for a sedan. (b) GT power supply for a sedan. (c) Energy system balance for a sedan.

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Figure 1

(a) Scheme of the parallelhybrid concept. (b) Scheme of series hybrid concepts.



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