Vapor is then carried with the
air-fuel mixture into the combustion chambers where it is burned.
This allows it to have a better
air-fuel mixture, which greatly reduces the formation of soot and nitrogen oxides (pollutants), and increases fuel efficiency by 20 percent.
This combustor is an application of technologies developed for integrated coal gasification combined cycle (IGCC) systems, allowing for low NOx combustion by mixing the fuel gas with an ample volume of air to quickly produce a lean
air-fuel mixture.
Tests of the experimental two-cylinder engine showed that the fuel consumption during microwave ignition is reduced by 13 to 20 percent (theoretically up to 30 percent), and the level of harmful emissions due to the lower temperature of combustion of the
air-fuel mixture by 80 percent.
They achieved engine operation with a lean
air-fuel mixture of up to 21:1, but detailed studies were not performed by them.
In short, SKYACTIV engines can compress the
air-fuel mixture in the cylinders to an extraordinary degree, thereby obtaining far more energy from every drop of fuel.
The initial temperature, cylinder pressure, and composition of the working fluid (
air-fuel mixture) play an important role in determining the combustion characteristics and consequently the emissions from an engine.
The O2 sensor monitors the gases emitted by the vehicle engine thereby maintaining the appropriate
air-fuel mixture to facilitate efficient functioning of the engine in accordance to the emission regulatory norms.
At the level D feedback corrects
air-fuel mixture composition by analyzing the oxygen content in the purified EG to ensure effective cleaning.
* 'Helical ramp' to induce ultra-high speed vortex of
air-fuel mixture in auxiliary combustion chamber
"In addition, fuels with higher ratings are a few percentage points denser, which allows more power per litre in the vehicle," Mathai explained, adding that engine experts are of the view that using a low octane fuel when your car requires a higher version is just as damaging and will lead to an abnormal combustion of the
air-fuel mixture in the cylinder.
The aforementioned is because increased compression ratio (CR) increases the tendency for the occurrence of a phenomenon denominated self-ignition, which takes place when at the start of the combustion in the
air-fuel mixture happens prior to the spark ignition, which causes quite high pressure peaks and a shock wave within the chamber.
