Volvo Technology Corporation06520, EM, 2005-11-22 /1

FPEC, Free Piston Energy Converter

Principal layout of the prototype

(USFD, INNAS)

Volvo Technology Corporation06520, EM, 2005-11-22 /2

FPEC, Free Piston Energy Converter

The electrical machine

(ABB)

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FPEC, Free Piston Energy Converter

The combustion system

(IFP, INNAS, CTH)

HCCI combustion

Two-stroke

Cyl. vol.: 2x1 litre

Diesel fuel

Simulation results:

Poweroptimal: 23 kW

Efficiencyind: ~51%

Efficiencyeff: ~46%

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FPEC, Free Piston Energy Converter

Cylinder

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FPEC, Free Piston Energy Converter

Cylinder head, complete

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FPEC, Free Piston Energy Converter

Photograph of the prototype

(INNAS)

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FPEC, Free Piston Energy Converter

Prototype in the test cell at Chalmers

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FPEC, Free Piston Energy Converter

• Control Inputs

- Electromagnetic force, Fel

- Fuel input, Qcomb

• Controlled Outputs:

- Output power, P- Ignition time, tign

(VTEC, USFD)

Control layout

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FPEC, Free Piston Energy Converter

1005 1010 1015 1020 1025 1030 1035 1040 1045-15

-10

-5

0

5

10

15

Time [ms]

El-force [kN]Piston displacement [cm]Piston velocity [m/s]

x0 x

1 x

2 x

3

(USFD, VTEC)

Control strategy

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FPEC, Free Piston Energy Converter

Balancing of the free piston engine

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FPEC, Free Piston Energy Converter

Main project results

• Integral prototype, rated power 15-50 kW to confirm efficiency, emissions, control procedures, etc.

• Experimental verification of performance.

• Results from modelling the onboard electricity generation system, especially controllability, performance at part load and transients.

• Results from scaling and packaging studies.