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HCCI Engine

Strategies to control combustion in HCCI engines: Modelling Investigations Ali M. Aldawood Supervisor: Dr Markus Kraft. HCCI Engine. Control Problem in HCCI Engine. Advance  Combustion start  Retard. SOC. Engine load. Control Problem in HCCI Engine. Misfire area.

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HCCI Engine

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  1. Strategies to control combustion in HCCI engines: Modelling InvestigationsAli M. AldawoodSupervisor: Dr Markus Kraft

  2. HCCI Engine

  3. Control Problem in HCCI Engine Advance  Combustion start  Retard SOC Engine load

  4. Control Problem in HCCI Engine Misfire area Advance  Combustion start  Retard SOC Knocking limit Engine load

  5. Control Problem in HCCI Engine Misfire area Lower load Upper load Advance  Combustion start  Retard SOC Knocking limit Operating window Engine load

  6. Control Problem in HCCI Engine Misfire area Controlled timing Advance  Combustion start  Retard SOC Knocking limit Engine load

  7. Purpose of Study • Investigate two fuel-based strategies to control the combustion timing • Detailed-chemistry, full-cycle model to simulate a single-cylinder HCCI engine • Closed-loop control of combustion timing using octane number or hydrogen ratio Misfire area Controlled timing Advance  Combustion start  Retard SOC Knocking limit Engine load

  8. Modelled Engine Sandia’s Cummins Diesel Engine

  9. Coupling GT-Power with SRM Stochastic Reactor Model GT-Power GT-Power Closed-Volume EVO IVC Firing TDC Intake Compression Power Exhaust 0o 180o 360o 540o 720o GT-Power simulates the open-volume (intake and exhaust) portion of the cycle SRM simulates the closed-volume (compression, combustion and expansion) portion of the cycle Pressure

  10. Octane Number & Hydrogen Control A closed-loop controller is integrated in the model. Either octane number or hydrogen ratio is varied to control the combustion phasing.

  11. Octane Number & Hydrogen Control A closed-loop controller is integrated in the model. Either octane number or hydrogen ratio is varied to control the combustion phasing.

  12. Hydrogen Addition – Load Transients Time (sec)

  13. Conclusion • Full-cycle HCCI engine model is integrated with Stochastic Reactor Model and closed-loop control • Integrated model provided effective tool to simulate HCCI transients and investigate combustion control strategies • Results suggest that both octane number and hydrogen addition are effective for HCCI combustion control

  14. End of Presentation Thank You

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