New-Generation Gasoline Engine “SKYACTIV-X”

Isobe Ritaro, Endo Koji, Sueoka Masanari

doi:10.34338/mazdagihou.36.0_16

<p>Skyactiv-X is a gasoline engine developed in the second step of Mazda's quest for the ideal internal combustion engine which started with Skyactiv-G. The focus of the second step was to improve specific heat ratio to achieve higher thermal efficiency. In particular, Mazda delved into lean combustion and adopted compression ignition (CI) to realize it. In our efforts to make the CI feasible under various environmental conditions, we had a number of challenges to overcome.</p><p>One of the major challenges was to expand the CI operating range while fully controlling switchover between CI and spark ignition. The enabler for this complete control of CI and spark ignition is SPCCI (Spark Controlled Compression Ignition). In its commercialization process, SPCCI combustion technology had to be made usable in as many situations as possible in everyday usage, and therefore a number of new technologies were adopted for combustion control, thermal management and NV reduction. As a result, Skyactiv-X has increased torque by more than 10% compared to the current Skyactiv-G gasoline engine in the entire operating range, and the vehicle equipped with Skyactiv-X has improved fuel economy in NEDC by around 30% compared to the previous model.</p>

New-Generation Gasoline Engine “SKYACTIV-X”

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