Named for its inventor, this engine sprays fuel directly into the chamber, where it is ignited by high- temperature air
Direct injection sprays fuel into the combustion chamber just prior to ignition;... [DOC] [TLE] OSA | Laser ignited engines: progress, challenges and prospects [PAR] In this context, research into LI of IC engines seeks to examine its potential to ... 
and to initiate ignition away from the (cold) walls of the combustion chamber.