Abstract—HCCI combustion can substantially reduce NOx and soot emissions of diesel engines. However it is hard for diesel HCCI to obtain the same level of fuel economy as traditional diesel engines. HCCI lacks an easily identified combustion trigger and, when achieved via variable valve actuation (VVA), includes cycle-to-cycle coupling through the exhaust gas. This makes controlling the process decidedly non-trivial. To address these issues, the development of a closed-loop controller for HCCI combustion phasing and peak pressure was outlined. Results from both simulation and experiment show that cycle-to-cycle control of VVA-induced HCCI can be achieved using this physics-based approach. Correct combustion timing is crucial for proper engine performance in a Homogeneous Charge Compression Ignition (HCCI) engine. To stabilize unstable operating points, reject system disturbances and enable set point changes, it is necessary to use a combustion timing controller. In this, variable valve timing was used to control combustion timing, optimising fuel systems By means of the variable valve timing, residual gases were captured in cylinder to facilitate combustion timing control
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