Background & Objectives
Brescia is an industrial city in northern Italy with a medieval centre. Buildings from the Celtic, Roman and medieval time in white marble are characterizing the historical centre. The city government wanted a bus line connecting seven car parks, situated outside the city centre, transporting park and ride clients into the historical centre and heart of the city, which has reduced car access and partly pedestrian areas.
The city of Brescia specified buses which are noiseless, vibration free and very low in emission (regarding grams of PM/kWh). This way the historical patrimonies may be preserved in the best way. Thus the city of Brescia ordered in 2000 four EPT HORUS serial hybrid buses with an electric engine and a micro turbine powered by methane.
The concept is based on a pure electric bus by using only electricity for the traction. A second component is the micro turbine which provides the necessary energy for the traction in sophisticated coordination with the batteries.
The bus drives only on the power of its batteries until the charging status reaches the 75% threshold. When this happens the micro turbine engine will instantly switch on automatically and provides two tasks at the same time:
1. A part of the energy out of the micro turbine coupled to an electric generator will be transferred into the electric motor.
2.The other part will charge the batteries at the same time.
At a state of charge of 90% the turbine switches off and the bus will run on electrical energy out of its batteries only.
A battery management system with a sophisticated software co-ordinates and checks all the operations which happen between the batteries the micro turbine and guarantees a full automatic operation by providing the traction with energy.
Technical data for the bus model HORUS:
length of 8 m, 11 seats and 31 standing places (10.50 m is also possible)
urban operating range of about 250 -300 km (depending on road condition, inclination etc.)
acceleration from 0-30 km/h is 9 seconds, from 0-50 km/h in 25 seconds at full load
maximum speed: 70 km/h.
maximum incline: up to 19% at a speed of 13 km/h fully loaded
An ideal City-bus for big cities with the possibility to reach the peripheral areas. The performance is comparable to conventional buses if we consider the real traffic conditions the public transport are facing.
The bus system is now noiseless, lowest emissions and vibration free which is very important for the historical buildings in Brescia.
The fuel consumption at a constant speed in a flat urban environment of 30 km/h (without stop and go) is about 0.6 kWh / km.
Ing. Marco Sala
ept - power technology S.r.l.
Via Brolo 63/65
I- 25075 Nave
EPT web site
EvaluationOutstanding attempt to innovate in propulsion technology- reducing energy demand by hybridisation thus taking GWP into account. Hybridisation should be standard with all CNG-projects.
Contact Marco Sala