FPEC, Free Piston Energy Converter

Principal layout of the prototype

(USFD, INNAS) Volvo Technology Corporation 06520, EM, 2005-11-22 /1

FPEC, Free Piston Energy Converter

The electrical machine

Volvo Technology Corporation 06520, EM, 2005-11-22 /2 (ABB)

FPEC, Free Piston Energy Converter

The combustion system

HCCI combustion Two-stroke Cyl. vol.: 2x1 litre Diesel fuel Simulation results: Power optimal : 23 kW Efficiency ind : ~51% Efficiency eff : ~46%

(IFP, INNAS, CTH) Volvo Technology Corporation 06520, EM, 2005-11-22 /3

FPEC, Free Piston Energy Converter Cylinder

Volvo Technology Corporation 06520, EM, 2005-11-22 /4

FPEC, Free Piston Energy Converter

Cylinder head, complete

Volvo Technology Corporation 06520, EM, 2005-11-22 /5

FPEC, Free Piston Energy Converter

Photograph of the prototype

Volvo Technology Corporation 06520, EM, 2005-11-22 /6 (INNAS)

FPEC, Free Piston Energy Converter Prototype in the test cell at Chalmers

Volvo Technology Corporation 06520, EM, 2005-11-22 /7

FPEC, Free Piston Energy Converter

Control layout

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Control Inputs

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Electromagnetic force,

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F el

Fuel input, Q

comb

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Controlled Outputs:

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Output power, P Ignition time, t

ign

(VTEC, USFD) Volvo Technology Corporation 06520, EM, 2005-11-22 /8

FPEC, Free Piston Energy Converter

Control strategy

15 El-force [kN] Piston displacement [cm] Piston velocity [m/s] 10 5 0 -5 -10 x 0 x 1 x 2 -15 1005 1010 1015 x 3 1020 1025 Time [ms] 1030 Volvo Technology Corporation 06520, EM, 2005-11-22 /9 1035 1040 1045 (USFD, VTEC)

FPEC, Free Piston Energy Converter

Balancing of the free piston engine

Volvo Technology Corporation 06520, EM, 2005-11-22 /10

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.

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Results from scaling and packaging studies.

Volvo Technology Corporation 06520, EM, 2005-11-22 /11