Strategies to control combustion in HCCI engines: Modelling Investigations Ali M. Aldawood Supervisor: Dr Markus Kraft.

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Presentation transcript:

Strategies to control combustion in HCCI engines: Modelling Investigations Ali M. Aldawood Supervisor: Dr Markus Kraft

Ali M Aldawood HCCI Engine

Ali M Aldawood Control Problem in HCCI Engine Engine load Advance  Combustion start  Retard SOC

Ali M Aldawood Control Problem in HCCI Engine Engine load Advance  Combustion start  Retard Knocking limit Misfire area SOC

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

Ali M Aldawood Control Problem in HCCI Engine Engine load Advance  Combustion start  Retard Knocking limit Misfire area SOC Controlled timing

Ali M Aldawood  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 Purpose of Study Engine load Knocking limit Misfire area SOC Advance  Combustion start  Retard Controlled timing

Ali M Aldawood Sandia’s Cummins Diesel Engine Modelled Engine

Ali M Aldawood Coupling GT-Power with SRM Intake Compression Power Exhaust GT-Power Stochastic Reactor Model GT-Power Closed-Volume EV O 0 o 180 o 360 o 540 o 720 o Firing TDC IVC 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

Ali M Aldawood 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.

Ali M Aldawood 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.

Ali M Aldawood Hydrogen Addition – Load Transients Time (sec)

Ali M Aldawood 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

Ali M Aldawood End of Presentation Thank You