Зависи како гледаш на процесот, може и вака:
Diesel engine combustion process
For the combustion process that occurs in the diesel engine, there is a relationship between the pressure inside the combustion chamber and the crank angle as shown on the left. This combustion process can be divided into the following four stages.
(1) Ignition delay (A – B) In preparation for combustion fine particles of the injected fuel evaporate and mix with the air in the cylinder to form an ignitable mixture.
(2) Flame propagation (B – C) In this stage, ignition starts from the areas within the air-fuel gas that have reached the proper ratio, and then continues to burn outward. From point B to C, the pressure rises sharply. The rise of pressure is affected by the volume of fuel injected at ignition delay, fuel spraying condition and airfuel mixture, etc.
(3) Direct combustion (C – D) In this stage, the fuel is burned with the flame in the combustion chamber immediately after the injection. The pressure from combustion rises more gradually because the fuel burns immediately after injection. The pressure at this time can be adjusted to a certain extent by adjusting the fuel injection volume.
(4) After burning (D – E) The fuel injection into the combustion chamber ends at point D. However, the remaining fuel, which could not burn, burns during this period. As the after burning period gets longer, the exhaust temperature rises and the heat efficiency*1 lowers. *1With heat engines, the heat efficiency means the ratio of heat energy converted into the workload and the heat energy of the supplied fuel.
Во бензинските мотори на Мерцедес од последната генерација имаат до 5 вбризгувања во циклус и повеќе кратно палење. Слично како и кај МултиЏет моторите на Фиат каде бројот на вбризгувања се разликуваат од условите во кои моторот рабооти, па имаш до две главни бризгувањеа и до две до три секундарни вбризгувања во истиот циклус.
Direct petrol injection with spray-guided combustion, which Mercedes-Benz was the first car manufacturer to introduce in series production, has been developed further by the engineers into third-generation direct petrol injection with spray-guided combustion. The system pressure is now up to 200 bar and is variably optimised according to the engine's characteristic map. Completely newly developed piezo-electric injectors allow up to five injections per power stroke for the best possible mixture formation, while multi-spark ignition helps to ensure reliable combustion of the mixture.
Гласање
