PT Journal AU Sima, M Bigos, P Tonhajzer, R TI Methods to Expand the Speed and Load Range of Homogeneous Charge Compression Ignition Engine SO Acta Mechanica Slovaca PY 2014 BP 36 EP 40 VL 18 IS 2 DI 10.21496/ams.2014.017 DE Homogenous charge compression ignition; active thermo atmosphere combustion; variable compression ratio; spark ignition engine; compression ignition engine ER