Editing Wankel engine (section)

===Laser ignition===
Laser ignition was first proposed in 2011,<ref name="autocar.co.uk">{{cite web|url= http://www.autocar.co.uk/car-news/motoring/mazdas-radical-new-rotary-tech |title=Mazda's radical new rotary tech |publisher=Autocar |date=2011-06-27 |access-date=2014-02-01}}</ref><ref>{{Cite web|url=https://patents.google.com/patent/DE102011083450A1/de|title=Rotationskolbenbrennkraftmaschine und Betriebsverfahren hierfür}}</ref> but first studies of laser ignition were only conducted in 2021. It is assumed that laser ignition of lean fuel mixtures in Wankel engines could improve fuel consumption and exhaust gas behavior. In a 2021 study, a Wankel model engine was tested with laser ignition and various gaseous and liquid fuels. Laser ignition leads to a faster center of combustion development, thus improving combustion speed, leading to a reduction in NO<sub>x</sub> emissions. The laser pulse energy required for proper ignition is "reasonable", in the low single-digit mJ-range. A significant modification of the Wankel engine is not required for laser ignition.<ref name="Loktionov Pasechnikov 2021 p=012031">{{cite journal |last1=Loktionov |first1=E Yu |last2=Pasechnikov |first2=N A |title=First tests of laser ignition in Wankel engine |journal=Journal of Physics: Conference Series |publisher=IOP Publishing |volume=1787 |issue=1 |date=2021-02-01 |issn=1742-6588 |doi=10.1088/1742-6596/1787/1/012031 |page=012031| bibcode=2021JPhCS1787a2031L |doi-access=free }}</ref>