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User Guide

Mazda's next-generation SKYACTIV-X gasoline engine technology

Engine with SPCCI combustion technology to be introduced in 2019

2017/12/14

Summary
Characteristics and issues associated with HCCI combustion
Technology concept of the SPCCI engine
SPCCI Engine: Combustion Technology
SPCCI Engine: Combustion Switching Technology
Main specifications and subsystem technologies of SPCCI engine
Engine performance

Summary

Next-generation Mazda SKYACTIV-X engine with SPCCI technology
(Exhibited at Tokyo Motor Show 2017)

In August 2017, Mazda announced its Long-Term Vision for Technology Development. As part of the technology to achieve this vision, the company disclosed plans to introduce its SPCCI (Spark Controlled Compression Ignition) engine for production in 2019. In September and October, Mazda held technology briefings for the media and conducted vehicle test drives, demonstrating their development progress. This report introduces Mazda’s SPCCI engine technology, which includes estimations based on Mazda technical data.

Technology concept of the SPCCI engine

Academically, HCCI (Homogeneous Charge Compression Ignition) combustion is considered to result in ideal combustion in gasoline engines. As such, SPCCI can thus be regarded as the technology concept that makes it possible to achieve HCCI combustion in gasoline engines.

Technically speaking, SPCCI differs from HCCI combustion, but allows an engine to realize the performance advantages of HCCI combustion, thus making SPCCI a technology that enables the intent of HCCI combustion technology. Mazda’s SPCCI technology can be considered a development breakthrough because their technology makes it technologically feasible to achieve stratified combustion for SI by using spark ignition (SI) combustion to control compression ignition (CI) combustion, which Mazda has taken to a technological level where it is ready to be put into a production engine.

This report first describes the characteristics and technical issues associated with HCCI combustion, and then introduces the technological concept of the SPCCI engine.

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