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What was the amendment to the four stroke engine from Daimler Motor Company in 1900 used in the first Mercedes automobile to offer a well timed combustion? 

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The paper demonstrates that in 2-stroke engine operation the in-cylinder charge inhomogeneity is significant.
The results demonstrate that, considering both the engine combustion and emission characteristics, a two-stage injection strategy in conjunction with an injection interval of 30–40°CA and a first-stage fuel injection proportion of 30–60% is advisable.
Fuel consumption is competitive with a four-stroke engine at wide open throttle and better at partial loads.
In this context it is pertinent to note that in terms of brake thermal efficiency and brake specific fuel consumption, a single cylinder four stroke engine acquires a better performance with 15% diethyl ether (DEE) as an additive to diesel.
In this study, an improvement of fuel consumption by changing the exhaust timing of a two-stroke engine has been made.
Therefore, a model without the composition terms should be adequate for model-based regulation of the combustion timing in an HCCI engine
In addition, in this paper, we demonstrate how ES can be used for the determination of an optimal combustion-timing setpoint on an experimental HCCI engine.
This enhanced the engine thermal efficiency over the diesel baseline combustion.
Thereby giving 2/3 Power strokes per revolution as compared to 1⁄2 in a Four Stoke Engine Six Stroke Engine has greater thermal efficiency, greater performance and compatibility to various fuels.
The results of the tests of the five-stroke engine confirm an increase of specific torque and power (related to unit of engine displacement) and improve of total efficiency within a certain range of the engine map.
According to numerical calculations it was proved that the real gas engine with the two-stage combustion system at equal degree requires exact regulation of the three analysed values.
The information derived from this work are useful to develop and calibrate a light-duty engine that operate in gasoline partially premixed combustion mode achieving NOx close to the Euro 6 limit without adopting any after treatment system.
Therefore, a model without the composition terms should be adequate for model based regulation of the combustion timing in a port-injection gasoline HCCI engine with high dilution from the exhaust.
It has been demonstrated that the developed multidimensional engine combustion and emi...
The most suitable for the realization of this concept is a direct injection two-stroke engine
The developed quasi-dimensional numerical model can accurately predict operating parameters of the four-stroke and the twostroke diesel engine.
Formulated conclusions significantly expand the area of knowledge concerning the functioning of the internal combustion engine in dynamic conditions.

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