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The similar targets of future spark-ignition (SI) and compression-ignition (CI) engines consisting in the noticeable increase of specific power concomitantly with the drastic reduction of fuel consumption and pollution in a wide operation range lead to similar development of thermodynamic functions and technical solutions. The achieved modular level of implementation of functions and solutions in advanced piston engines allows to establish common development platforms for both SI and CI engines. Such functions are the scavenging management, the spray-guided mixture formation by fuel direct injection, the exhaust gas recirculation and the homogeneous charge compression ignition. Under the technical solutions to their generation there are the super- or turbocharging, the variable control of intake-and exhaust valves and the direct injection techniques by common rails or by high pressure modulation.

High power-to-volume ratio and significant reduction of fuel consumption and pollution are paramount development targets for both SI and CI engines for automotive propulsion. Their implementation within a broad function range generated modular technical solutions - as elements of a general down-sizing platform - which are successful applicable in both SI and CI engines. The effects of such techniques, from super-charging or turbocharging, variable valve control and direct injection up to exhaust gas recirculation, autoignition-generated combustion and catalyst system indicate a merging which causes a basic discussion about the convergence of SI and CI engines.