Mazda to use diesel technology to build ultra-efficient petrol engines

[Elderberry]

Flagship 08/08/2017

As we reported last week, the first application Mazda's ground-breaking homogenous charge compression ignition (HCCI) technology - which beats the likes of Daimler, General Motors and Hyundai-Kia to market - will be next year's redesigned Mazda3. He said Mazda did not plan to supply the new engine to other automakers. This new type of spark-less engine will debut with the next-gen Mazda3 in 2019.

That would echo the launch of the previous Mazda3, which debuted the Japanese car-maker's original SKYACTIV engines not from launch but early in its model cycle. This is what Mazda is calling controlled compression ignition (CCI).

As a result, Mazda says the CCI engine uses an air-fuel ratio that is two times thinner, which is quite extraordinary.

As part of its Sustainable Zoom-Zoom 2030 plan, Mazda has pledged to reduce corporate average well-to-wheel Carbon dioxide emissions to 50% of 2010 levels by 2030, before reducing them by 90% by 2050.

The new engine technology was announced as part of Mazda's Sustainable Zoom-Zoom 2030 plan, which, among other things, outlines the company's plans for electrification and emissions minimization.

This type of configuration is now only applied in diesel engines, but Mazda says it has developed a formula for use in petrol engines, becoming the world first.

More: http://flapship.com/2017/08/mazda-to-use-diesel-technology-to-build-ultra-efficient/

[thackney]

Steps Toward Practical Application of HCCI

Control of the gas temperature inside the combustion chamber is vital to HCCI combustion range expansion. Nissan has developed the following technologies to deliver this:



Steps Toward Practical Application of HCCI

* Technology for Measuring Gas Temperature inside Combustion Chamber

To accurately measure the gas temperature inside the combustion chamber, which is key to HCCI combustion, Nissan and Stanford University jointly developed technology to measure the real-time gas temperature inside the engine. This technology is being utilized for the development of HCCI.

* 3D HCCI Simulation Technology

As the ignition mechanism for HCCI combustion does not depend on spark plugs, it is necessary to control the auto-ignition timing and combustion duration. Nissan has newly developed technology to accurately simulate HCCI three-dimensionally.

* Utilization of VVEL

To control the gas temperature inside the combustion chamber, it is necessary to change the amount of residual exhaust gas accordingly to driving conditions. Nissan uses VVEL, which allows free-control of the valve timing and lift, for both intake and exhaust valves, to control temperature by effectively using internal EGR.

http://www.nissan-global.com/EN/TECHNOLOGY/OVERVIEW/hcci.html