Otto cycle

Are there any other cycles besides the Otto cycle used in car engines?

Otto cycle is exactly the same one that was described for the four-stroke engine.

In 1877 the Otto cycle was patented, immediately recognized to have a significant practical value.

The Otto cycle by comparison has both the heat addition and rejection at constant volume.

It is not related to the Otto cycle.

The Otto cycle includes the intake, compression, combustion and exhaust strokes.

In thermodynamics, heat engines are often modeled using a standard engineering model such as the Otto cycle.

Applying this to the Otto cycle the four process equations can be derived:

In this configuration an increase in both power and efficiency can be achieved when compared to the Otto cycle.

In the Otto cycle, there is no heat transfer during the process 1-2 and 3-4 as they are reversible adiabatic processes.

Notably the combustion takes place at constant pressure, rather than with the Otto cycle, constant volume.

There are several major differences between the Otto cycle engine and the four-stroke diesel engine.

The resulting cycle, which closely resembles the actual operating conditions, is the Otto cycle.

This is analogous to the increase of efficiency seen in the Otto cycle when the compression ratio is increased.

The systems capture the wasted heat of the four-stroke Otto cycle with an injection of air or water.

The Otto cycle is constructed out of:

A four-stroke spark-ignition engine is an Otto cycle engine.

However the compression ratio of Otto cycle engines is limited by the need to prevent the uncontrolled combustion known as knocking.

Such engines were very inefficient and were superseded by engines working on the Otto cycle.

The Diesel cycle is less efficient than the Otto cycle when using the same compression ratio.

The compression stroke is the second of four stages in an otto cycle or diesel cycle internal combustion engine.

From analyzing equation 6 it is evident that the Otto cycle efficiency depends directly upon the compression ratio .

Most automobiles use four-stroke Otto cycle engines with multiple cylinders attached to a single inlet manifold.