F R A U N H O F E R I N S T I T U T E F O R T R A N S P O R TAT I O N

A N D I N F R A S T R U C T U R E S Y S T E M S I V I

MOVING THE FUTURE –INNOVATIVE POWER TRAIN SYSTEMS

H O W T O G E T T O T H E I N S T I T U T E

Use the link www.ivi.fraunhofer.de to find a detailed

description of how to get there.

For further information feel free to contact us.

Public Relations

Elke Sähn

Phone +49 351 4640-612 | presse@ivi.fraunhofer.de

Fraunhofer Institute

for Transportation and Infrastructure Systems IVI

Director: Prof. Dr. Matthias Klingner

Zeunerstraße 38 | 01069 Dresden

Phone +49 351 4640-800 | www.ivi.fraunhofer.de

Gesam�ahrzeug

vehicleengine

gear box

VOITH DIWA

ZF

others

differen�al

pressure tank

compressor

cooling circuit

fan pump

cooling circuit

generator

ba�ery

door driveinterior

braking system

electrical consumer

air condi�oner

fuel pump

starter

servo steering

wheel

wheel

wheel

auxiliary heater

ME M M M M M M M M M

M

P

E

M

E

M

E

M

E

M

P

P

ME

E

E

PPT

T

TT

T T

P M

M

M

M

E

E

E M

E

M

M

T

T

fan pump

M

E

M

M

E

E

fan pump

M

E

M

E

E

M

100 200 300 400 500 600 700 800 900 10000

5

10

15

20

25

time

velocity

I D E A

S I M U L A T I O N M O D E L

The Fraunhofer Institute for Transportation and Infrastructure

Systems IVI operates a test field, at which diesel engines,

electrochemical and electrostatic accumulators (batteries, super

caps) can be tested. The test stands can be operated separately

or together allowing investigations of hybrid power trains of

commercial vehicles.

Engine test stand

Load machine with 300 kW continuous power

(four quadrant operation)

Continuous torque 2000 Nm

Max. engine-speed gradient 10 000 rpm/s

Fuel conditioning and measuring equipment

Measuring equipment for torque, speed, pressure and

temperature

Separate data logging for 64 channels with a sampling

rate of 100 kHz

Test stand automation

Accumulator test stand

Air-conditioned test bed (20 – 60 °C)

Variable electronic load of up to 250 kW

(two quadrant IGBT-converter)

Current 0 – 400 A

Voltage 30 – 800 V

CAN Interfac

The Fraunhofer IVI developes concepts for the on-board power

supply and the energy transfer from roadside charging stations to

vehicles. The concepts are implemented into vehicle prototypes and

tested.

The minimization of their mass and dimensions as well as the

reduction of emissions and energy consumption are essential for

the development of power supply systems. To achieve these

objectives, the Fraunhofer IVI carries out:

studies on compact power trains consisting of an engine, a

generator and power electronics as well as on all-electric power

trains for public transport vehicles and

the development of operation strategies for maximum energy

efficiency taking vehicle-specific operation conditions into

account.

The Fraunhofer IVI expertise on roadside energy supply comprises:

discontinuous energy supply for all-electric puplic transport

vehicles using charging stations,

conception, construction and testing of systems for

high current energy transfer from local charging stations to

buses and trams and

reduction of grid loads by using electrical energy storages in

local charging stations (»docking principle«).

Conventional commercial vehicle concepts offer a lot of possibilities

to optimize fuel consumption. The focus of current developments is

on minimizing the energy consumption of the power train.

The power demand of the auxiliaries also influences the fuel

consumption significantly, but has not yet been widely considered.

The institute disposes of a physical complete vehicle simulation

model for the analysis of the energy consumption of various

auxiliaries, which includes power train components e. g. the

pressure system,

on-board supply system,

steering servo system,

cooling system and

air conditioning system.

The modular concept of the model allows the design, test and

analysis of different technical measures. Furthermore, operation

strategies for the power train and the auxiliaries can be developed

and tested. The simulation model can also used for power train

dimensioning and controller testing.

At the Fraunhofer IVI longitudinal dynamics simulations can be

carried out using a simulation model, which makes it possible to

configure power trains and improve power management strategies.

The modular model structure, consisting of

vehicle modules of up to 3 segments and five axles or bogies,

map-based internal combustion engine modules,

map-based electric engine and gearbox modules,

characteristic curve based power electronics,

on-board supply system and traction-energy storage modules,

tyre-slip and rail-wheel-contact modules,

control strategies as well as,

time- and distance-based velocity and height profiles

enables the composition of a wide variety of conventional, hybrid

and electric vehicles. More than 100 different power train

configurations can be simulated and analysed. The selection of

the power train configuration and operating strategy as well as

the parameterization of the components and the driving cycle is

supported by a visual user interface and a components database.

Time-consuming serial simulations of single parameters and

complete data sets can be carried out automatically. For the study

of the results, comfortable analysis and visualization tools are

implemented.

P H Y S I C A L C O M P L E T E V E H I C L E M O D E LP O W E R T R A I N T E S T F I E L D E N E R G Y S U P P LY F O R V E H I C L E S