homogeneous charge compression ignition (HCCI) tech https://en.wikipedia.org/wiki/Homogeneo ... n_ignition en:Homogeneous charge compression ignition HCCI Homogeneous charge compression ignition HCCI Homogeneous Charge Compression Ignition HCCI HCCI HCCI HCCI HCCI (Homogeneous charge compression ignition) HCCI HCCI homogeneous charge compression ignition HCCI Homogeneous charge compression ignition HCCI HCCI HCCI HCCI HCCI (and related) HCCI HCCI engines