##Internal Combustion Engines
###Thermal Engines
###Cycle Direction
###Efficiency
###Mixture Formation, Combustion, Emissions
####Gasoline Engine
Requires external ignitions source i.e. spark plug.
Uses a homogenous air/fuel mixture. Homogeneity achieved through external mixture formation i.e. manifold injection or internal mixture formation i.e. gasoline direct injection.
#####Mixture Formation
#####Combustion in Gasoline Engines
#####Ignition
Purpose to initiate combustion process. Depending on velocity of the subsequent combustion and piston speed the point of igntion must be variably adapted.
#####Combustion of Homogenous Mixtures
#####Combustion of Partially Homogenous Mixtures
Pollutant formation and reduction of pollutants in gas engines
By products C02 and H20 NOx, HC and CO, Soot, and S0 compounds
####Diesel Engine
Does not require external ignition, has higher engine stability.
Fuel spray formation, fuel vaporization, fuel mixing and combustion can happen within a short time.