Modelling and Control of Linear Combustion Engine (LCE) Pavel Němeček, Ondřej Vysoký, Michal Šindelka Czech Technical University in Prague Faculty of Electrical.

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Presentation transcript:

Modelling and Control of Linear Combustion Engine (LCE) Pavel Němeček, Ondřej Vysoký, Michal Šindelka Czech Technical University in Prague Faculty of Electrical Engineering Department of Control Engineering

Internal Combustion Engines inline V flat (boxer) Crank shaft turns the piston's up and down motion into circular motion

Series Hybrid Car Gasoline engine turns a generator Generator can either charge the batteries or power an electric motor that drives the transmission Thus, the gasoline engine never directly powers the vehicle and no rotation needed ?!

Linear Combustion Engines single hit – easy industrial staplers how to achieve repetitive (periodic) motion??? by proper configuration and control

LCE – animation Two-stroke, Two opposite cylinders (2x50 ccm) Pistons directly connected by rod (no crankshaft) Direct air assisted fuel injection Contains linear electric motor-generator - enable starting of LCE - provide conversion to electric energy - enable intervention when misfire occurs No mechanical output, application for serial hybrid vehicles Control, control, control !

Schematic diagram of LCE

Advantages of the LCE Elimination of friction losses - associated with the crankshaft and it’s accessories - piston friction reduction (no angular loading) => higher efficiency High power density Compact shape (allow non-standard inbuilt) Reduced amount of moving parts - increase durability - simplify mechanical construction - simplify lubrication Compression ration is not fixed => theoretically multi-fuel operation is enabled

Designing of the simple model, which allow study of the basic LCE behavior Building up of an experimental prototype of the LCE and validation of the model Control algorithm design for achieving a steady operation Controller’s optimization with respect some criteria of quality (efficiency, emission, power etc.) Design of a power management strategy of a serial hybrid vehicle with the LCE as the main power unit Phases of LCE research

Model of the LCE nonlinear scavenging, non homogenous mixture 3 order

Model of Electric motor-generator

Model of Combustion Engine

Block diagram of the control system

Requirements for the control system of the linear electric motor-generator Collision avoiding between the piston and the cylinder head Maximization of drained electric power in each cycle Prevention of the LCE from stopping when a misfire occurs Starting of the LCE (with respect to a actual LCE state)

Experimental results Long term steady operation was achieved Max. drained electric power: 400 W at 1200 rpm

Experimental results

Video – LCE prototype in operation

Conclusion and further work Conclusion Long term steady operation was achieved Efficiency of the present experimental prototype is low, but it allow study of the system behavior Further work Optimization of the thermodynamical cycle Design and construction of a new prototype in cooperation with mechanical engineers to increase efficiency and durability of the LCE