A method of controlling cylinder valve switching between a first valve condition and a second valve condition for transitioning between combustion modes of an engine comprises adjusting timing of a signal to switch between said valve conditions in response to information from a combustion sensor, wherein said combustion modes include spark ignition and homogeneous charge compression ignition.

 
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< Hydraulic actuation system for improved engine control

> Control apparatus and control method for a variable valve timing mechanism

> Approach for facilitating engine mode transitions

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