Mazda's new SKYACTIV-X engine represents a significant step towards this goal. It is the world's first commercial gasoline engine to use compression ignition, in which the fuel-air mixture ignites spontaneously when compressed by the piston. The company's proprietary combustion method Spark-Controlled Compression Ignition (SPCCI) combines the spark ignition of a gasoline engine with the compression ignition of a diesel. This overcomes two issues that have, until now, impeded the commercialisation of compression ignition gasoline engines; maximizing the operating zone in which compression ignition is possible, and achieving a seamless transition between compression ignition and spark ignition.
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