Mazda's sparkless gas engine 2018

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etusch
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Mazda's sparkless gas engine 2018

Post by etusch » Mon Aug 07, 2017 2:49 pm


Chery
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Re: Mazda's sparkless gas engine 2018

Post by Chery » Fri Aug 18, 2017 11:05 am

I am also inquiring into the Mazda 2018 engine whether it is down after 2 years k you

outsid3r
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Re: Mazda's sparkless gas engine 2018

Post by outsid3r » Wed Aug 23, 2017 1:22 pm

I am surprised there wasn't much interest on this topic. This is the same technology Honda are trying to introduce in F1, is it not?

etusch
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Re: Mazda's sparkless gas engine 2018

Post by etusch » Wed Aug 23, 2017 9:01 pm

I don't know if Honda is trying to do it. But want to see them introduce this tech. If Mazda achieved Honda can also achieve or Honda and mazda could work together on this.

godlameroso
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Re: Mazda's sparkless gas engine 2018

Post by godlameroso » Mon Aug 28, 2017 5:56 pm

No one in F1 uses HCCI in any manner.
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bill shoe
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Re: Mazda's sparkless gas engine 2018

Post by bill shoe » Mon Aug 28, 2017 9:15 pm

Pretty good tech article about this engine-

http://www.motoiq.com/MagazineArticles/ ... ngine.aspx

So how did Mazda do it? We are going to take a few guesses, but as with most technologies, it didn’t happen overnight. In fact, we would say Mazda’s first big step was a few decades ago. The final piece of the puzzle is a technology Mazda has called Spark Controlled Compression Ignition (SPCCI), and we will exclusively get into how that ties into making HCCI work.

J.A.W.
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Re: Mazda's sparkless gas engine 2018

Post by J.A.W. » Wed Aug 30, 2017 6:32 am

Yeah.. it really aint no big deal..
..since in fact, Evinrude ETEC marine engines have been on sale for the past decade featuring DI/HCCI-mode..
& they are available in 'heavy fuel' (diesel) operation options too..
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etusch
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Re: Mazda's sparkless gas engine 2018

Post by etusch » Mon Sep 04, 2017 9:17 am

I like Car Producer which have their own style, like subaru using boxer engines ( porsche also uses and I like porsche too but I like japannese cars more ) like mazda with rotary engine. I think rotary engine will be good with electric motor. I like to see them keeping this motor available. It seems like they are very confident about this tech that they believe they can make sparkless rotary engine.
The most recent Renesis-generation rotary that powered the RX-8 until 2012 was turbo-free aside from the limited-production hydrogen models sold in Japan and Norway. However 13B and 20B engines that preceded it in the FD RX-7 and JC Cosmo both used twin-sequential turbos to overcome the engine's intrinsic torque deficit at low revs.

The SkyActiv-R's biggest gain will likely revolve around the way it burns fuel, with Mazda developing unique methods for analysing and measuring the combustion process. Fujiwara explained that regular piston engines can be analysed with standard techniques, but the lack of such tools for rotary engines has hampered their efficiency in the past.

Previous rotary engines have also been compromised by the need to locate the spark plug outside the combustion chamber to allow the rotor to sweep past, but Fujiwara confirms this has been solved for the SkyActiv-R.

Considering the high compression ratio used by rotaries in general, this seems a natural fit with the homogeneous charge compression ignition (HCCI) expected for the second-generation SkyActiv 2 technology due in 2020. Like diesel engines, HCCI relies on extra-high compression to ignite fuel,eliminating the need for spark plugs altogether and reducing consumption and emissions significantly.

Fujiwara declined to officially confirm the move to compression ignition, but his wry smile response hinted this suggestion isn't far off the mark.

Given the likelihood the production RX-Vision will arrive as part of Mazda's 100th birthday celebrations in 2020, the incorporation of such landmark technology would make a lot of sense.
https://www.carsguide.com.au/car-news/m ... tion-36576

roon
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Re: Mazda's sparkless gas engine 2018

Post by roon » Wed Oct 11, 2017 10:27 pm

bill shoe wrote:
Mon Aug 28, 2017 9:15 pm
Pretty good tech article about this engine-

http://www.motoiq.com/MagazineArticles/ ... ngine.aspx

So how did Mazda do it? We are going to take a few guesses, but as with most technologies, it didn’t happen overnight. In fact, we would say Mazda’s first big step was a few decades ago. The final piece of the puzzle is a technology Mazda has called Spark Controlled Compression Ignition (SPCCI), and we will exclusively get into how that ties into making HCCI work.
Just ran across this article myself. The author speculates that VVT & EGR are used as a coarse control, with spark and fuel injection used for fine control.
SPCCI is genius because it uses the same physics which causes knock, to well, cause knock. Remember, Skyactiv-G uses direct injection and Skyactiv-D uses fuel injectors which can spray many times in one combustion cycle. So, what we think SPCCI does is spray a tiny bit of fuel right at the spark plug and the fuel is ignited- creating a little frame front. That flame front then increases the pressure and temperature in the homogenous mixture; basically, the mixture is getting compressed from below by the piston and then above by this tiny flame front. The tiny flame front increases the pressure until the whole enchilada goes off. As fuel and spark can be controlled very precisely and very quickly, it gives the superfast fine-tuning adjustability knob to control the timing of the full HCCI combustion in the cylinder.
A controlled flame front acting as a sort of second piston face. Except that one 'piston' has a variable shape and approach. The remaining fuel-air charge that gets sandwiched between these two faces enters HCCI.

This reminds me of TJI or CVCC in the sense of using a small, controllable combustion moment to initiate a larger one.

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