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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. Modelling and Control of Linear Combustion Engine (LCE). Internal Combustion Engines. inline V flat (boxer).

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Modelling and Control of Linear Combustion Engine (LCE)

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

  2. Internal CombustionEngines • inlineV • flat (boxer) Crank shaftturns the piston's up and down motion into circular motion

  3. 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 ?!

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

  5. LCE – animation • Two-stroke, Two oppositecylinders(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 !

  6. Schematic diagram of LCE

  7. 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

  8. Phases of LCE research • 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

  9. Model of the LCE nonlinear scavenging, non homogenous mixture3 order

  10. Model of Electric motor-generator

  11. Model of Combustion Engine

  12. Block diagram of the control system

  13. Requirements for the control systemof 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)

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

  15. Experimental results

  16. Experimental results

  17. Video – LCE prototype in operation

  18. 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

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