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If is too high, the mixture will ignite without a spark (at the wrong location in the cycle). Nikolaus Otto, in full Nikolaus August Otto, (born June 10, 1832, Holzhausen, Nassau, Germany—died January 26, 1891, Cologne), German engineer who developed the four-stroke internal-combustion engine, which offered the first practical alternative to the steam engine as a power source.. Otto built his first gasoline-powered engine in 1861. The Otto air standard cycle is more efficient because the area under the PV diagram is larger. $$ Finally one determines the total motor efficiency, for the four cycle engine and for two cycle engine. Two condition arises for the above question- 1. At same compression ratio- At same compression ratio diesel cycle efficiency is less than otto cycle.The diesel cycle efficiency depends upon the cut-off ratio. Looking at this link for the Otto cycle (or this great link from MIT), you may observe that in this cycle there are four temperatures involved, and the efficiency is given by $$ \epsilon_O = 1-\frac{T_4- T_1}{T_3 - T_2}. The Otto cycle C r is limited to around 10-12 to avoid knock and resulting engine damage, thus limiting the maximum Otto cycle efficiency to values lower than for Diesel or the limited pressure cycle which can operate at much higher C r. Otto cycle derivation Now, Let’s consider the process from 1-2 as Adiabatic Compression & 3-4 as Adiabatic Expansion which was derived below in a hand written format. The ideal Otto cycle efficiency is shown as a function of the compression ratio in Figure 3.11. 5.

3.
The Otto air standard cycle is more efficient, but in real engine cycles with a gas exchange process, the diesel tends to be more efficient. Follow the below derivation in order to calculate the efficiency of the Petrol engine by Otto Cycle. Internal combustion engines are modeled by the Otto cycle rather than by the Carnot cycle. 2 Engine work, rate of work per unit enthalpy flux As the compression ratio, , increases, increases, but so does .