Why does the internal combustion engine rotate 2 times for a cycle

I am now learning the book Principles of Internal Combustion Engines, which are now mainly divided into 4-stroke and 2-stroke. In reality, 4-strokes are the majority (probably only motorcycles are 2-strokes). A 4-stroke is all about two turns.

Because every 180 degrees is a stroke. The two strokes of the first turn of the 4-stroke are the suction and compression processes (gasoline engines and diesel engines are not the same). Then start the third stroke (that is, the second turn) ignition work.

After the workmanship, it's the fourth stroke exhaust. Because there must be oxygen for ignition, and the waste must be discharged after ignition, there is only one stroke that really does work in a cycle. Now there is no engine that can exhaust the exhaust gases, there are only relative numbers.

As for idling and deflating, the technical term is called idle (when the engine is running, if you completely relax the accelerator pedal, then the engine is in idle state (this thing is a human consequence) I am now a junior and I think the internal combustion engine is very promising, and I plan to study for a doctorate. Hope it helps.

The first is the intake, the second is the exhaust, and the end of a duty cycle is completed after completion.

The internal combustion engine is divided into two-stroke and four-stroke, the crankshaft of the two-stroke internal combustion engine rotates for a cycle, and the power of this kind of internal combustion engine is relatively high, such as the most common motorcycle now, but due to the exhaust emission and the unused part of the gas, the efficiency has decreased.

The four strokes of a four-stroke internal combustion engine are divided into: suction, compression, work, and exhaust.

We think of the crankshaft as a point that rotates around the main shaft, and each stroke of the crankshaft rotates 180°, e.g. in the suction stroke, the crankshaft turns from the starting position to the opposite side. In this way, the four strokes of the crankshaft rotate a total of 720° for a total of two weeks.

In this way, the piston does work every two weeks when the crankshaft rotates, so as to drive the spindle to rotate, and the spindle drives the load movement through variable speed and direction.

As for the definition of stroke, according to the piston, the piston moves to the top for the upper fulcrum, and the movement to the bottom is the lower fulcrum, and the process of the piston moving from one fulcrum to another becomes a stroke every time.

1.(15 times) 2 revolutions per four strokes: 1800r min=30r, s30 2=15 times.

2.(60) (15 times) Same as above, 15 cycles, completed 15 * 4 = 60 strokes to complete a cycle of the dust Xianghuan (four strokes) internal combustion engine externalDo the workOnce, so I did 15 exercises.

The second and third of the four strokes of an internal combustion engine are converted into energy, and the compression stroke is the conversion of mechanical energy.

Converted into internal energy, whereas the work stroke is to convert internal energy into mechanical energy.

Moreover, the suction stroke, compression stroke, and exhaust stroke are operated by flywheel inertia. The crankshaft of the engine.

A two-stroke is a two-stroke that completes a work cycle after one turn, and a four-stroke is a four-stroke if it takes two positive turns to complete a work cycle.

Stroke refers to the process by which the piston goes up or down once in the cylinder. The four strokes are suction, compression, work and exhaust.

The four strokes are carried out sequentially and are called a duty cycle, also called the "Otto cycle" (because the working mode of the piston engine was invented by Otto). A two-stroke is a two-by-two combination of four four-strokes into a single stroke.

The internal combustion engine is a kind of power machinery, which is a heat engine that burns fuel inside the machine and converts the heat energy released from it directly into power.

In a broad sense, internal combustion engines include not only reciprocating piston internal combustion engines, rotary piston engines and free piston engines, but also jet engines with rotary impellers.

But what is commonly referred to as an internal combustion engine refers to a piston internal combustion engine.

In the past, the resurrection piston type of piston internal combustion engine was the most common. A piston internal combustion engine mixes fuel and air and burns it in its cylinder, and the heat energy released causes the cylinder to produce high-temperature and high-pressure gas. The gas expansion pushes the piston to do work, and then passes through the crank linkage mechanism.

or other bodies will be mechanically worked.

Output, drive from the motive brother laughing machine work.

The common ones are diesel engines and gasoline engines.

By converting internal energy into mechanical energy, it is by doing work to change internal energy.

1.(15 times).

2 revolutions per four large strokes.

1800r/min=30r/s

30 2 = 15 times.

2.(60) (15 times).

Same as above, 15 cycles, 15 * 4 = 60 strokes completed.

After completing one cycle (four strokes), the imitation gas turbine does external work and destroys branches once, so it does 15 times of work.

Four-stroke internal combustion engines are in one duty cycle, with the piston reciprocating twice and the crankshaft rotating for two weeks.

In a four-stroke engine, the piston has to complete the aspiration during a duty cycle. Compress. Do the work

Exhaust these four strokes. Wherein, in the suction stroke, the piston moves from the top dead center to the bottom dead center, and the crankshaft rotates half a turn at this time, and the compression stroke moves from the bottom dead center to the top dead center, and the crankshaft turns half a turn again at this time and returns to the original point. The power stroke piston is from the top dead center to the bottom dead center, the crankshaft rotates half a turn, the exhaust stroke is from the bottom dead center to the top dead center, and the crankshaft turns half a turn.

So a four-stroke internal combustion engine is in one duty cycle, with the piston reciprocating twice and the crankshaft rotating twice.

The piston reciprocates 2 times, the crankshaft rotates for 2 weeks, completes four strokes, and does 1 work externally.

The piston reciprocates twice and the crankshaft rotates for two weeks.

A working cycle of a four-stroke internal combustion engine is composed of four strokes: suction, compression, work and exhaust;

In one working cycle, the crankshaft rotates for 2 weeks, and the gas does work on the piston 1 time;

Among the four strokes of the gas turbine, only the power stroke does work on external objects, and the other strokes rely on the inertia of the flywheel to work

So the answer is: compression; Do the workBurning Ant Bump 1; Inertia