manolis wrote: ↑
Wed Mar 28, 2018 3:32 pm
Mazda changing only the combustion achieved a 20% reduction of the fuel consumption.
The SkyActiv-G at left has changed to the SkyActiv-X at middle only by improving the combustion.
Is there something else that can do such a difference?
And I anticipate that the difference for the 2-strokes will be even greater.
If thermal efficiency is the major goal, in identifying the TE limits of Jet Controlled CI the mid to high 50's. Controlling amount of trapped internal EGR via valve phasing, air dilution %, direct injection timing and start of combustion.
Using cylinder pressure sensors x 2, SAW sensors on the valve window gas sealing array providing a pressure reading AI Machine learning can calculate cylinder pressure when production cylinder pressure experiences Detonation artificially induced.
Using GAN AI to explore engine control and operation, especially the piston motion from offset equal to stroke. Optimising combustion phasing in defragration MiLD lambda > 1.6. Position of CA50-CA90 very important.
Seems at very low loads with a combustion chamber otherwise known not to detonate by artificially inducing it improves cylinder pressure but not the heat release. Calling it JCD Jet Controlled Detonation. Requiring features on cylinder head fire surface interacting with acoustic waves.
Operating different combustion regimes that give best TE outcomes depending on load keeps efficiency high and limiting CI to lower loads reduces engine stressed and mass. Dilution with internal EGR reduces pumping losses maintaining throttle near wide open.