Anonymous
Aug 5
Explain operation of Four stroke cycle?
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ChatGPT
Aug 5
The four-stroke cycle, also known as the Otto cycle, is the most common type of internal combustion engine cycle used in automotive engines. It consists of four distinct processes that occur in each cylinder of the engine: intake, compression, power, and exhaust.
1. Intake: The intake stroke begins with the piston at the top of its stroke and the intake valve open. As the piston moves downward, a mixture of air and fuel is drawn into the cylinder from the intake manifold.
2. Compression: Once the intake stroke is complete, the intake valve closes and the piston moves back up the cylinder, compressing the air-fuel mixture. This compression increases the pressure and temperature of the mixture, making it more volatile and ready for combustion.
3. Power: At the top of the compression stroke, the spark plug ignites the compressed air-fuel mixture, causing a controlled explosion. This explosion forces the piston back down the cylinder, creating power that is transferred to the crankshaft through the connecting rod.
4. Exhaust: After the power stroke, the exhaust valve opens and the piston moves back up the cylinder, pushing the burned gases out through the exhaust manifold. This process clears the cylinder of exhaust gases and prepares it for the next intake stroke.
The four-stroke cycle is repeated continuously in each cylinder of the engine, with each cylinder firing at different intervals to create a smooth and continuous power output. This cycle is efficient and reliable, making it the preferred choice for most automotive engines.
1. Intake: The intake stroke begins with the piston at the top of its stroke and the intake valve open. As the piston moves downward, a mixture of air and fuel is drawn into the cylinder from the intake manifold.
2. Compression: Once the intake stroke is complete, the intake valve closes and the piston moves back up the cylinder, compressing the air-fuel mixture. This compression increases the pressure and temperature of the mixture, making it more volatile and ready for combustion.
3. Power: At the top of the compression stroke, the spark plug ignites the compressed air-fuel mixture, causing a controlled explosion. This explosion forces the piston back down the cylinder, creating power that is transferred to the crankshaft through the connecting rod.
4. Exhaust: After the power stroke, the exhaust valve opens and the piston moves back up the cylinder, pushing the burned gases out through the exhaust manifold. This process clears the cylinder of exhaust gases and prepares it for the next intake stroke.
The four-stroke cycle is repeated continuously in each cylinder of the engine, with each cylinder firing at different intervals to create a smooth and continuous power output. This cycle is efficient and reliable, making it the preferred choice for most automotive engines.
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Google Gemini AI
Aug 5
Four-Stroke Cycle
A four-stroke cycle is a sequence of four distinct events that occur within the cylinder of a piston engine, completing one combustion cycle. Each stroke corresponds to a different phase of the cycle.
1. Intake Stroke:
- The intake valve opens.
- The piston moves downwards, creating a vacuum in the cylinder.
- A mixture of fuel and air is drawn into the cylinder through the intake valve.
2. Compression Stroke:
- Both intake and exhaust valves are closed.
- The piston moves upwards, compressing the air-fuel mixture.
- As the mixture is compressed, its temperature and pressure increase.
3. Power Stroke (Expansion Stroke):
- At the end of the compression stroke, the spark plug ignites the air-fuel mixture, causing a controlled explosion.
- The expanding gases push the piston downwards, generating power.
4. Exhaust Stroke:
- The exhaust valve opens.
- The piston moves upwards, pushing the exhaust gases out of the cylinder through the exhaust valve.
- Both intake and exhaust valves remain open briefly to allow for any remaining gases to escape.
Key Features:
- The cycle repeats itself continuously, producing a sequence of power strokes.
- The valves control the timing of the stroke events.
- The ratio of the compression stroke volume to the power stroke volume is called the compression ratio, which affects engine efficiency.
Advantages:
- Efficient use of fuel
- High power output
- Smooth operation
Disadvantages:
- Requires a complex and precisely timed valve system
- Can be more expensive to manufacture compared to two-stroke engines
A four-stroke cycle is a sequence of four distinct events that occur within the cylinder of a piston engine, completing one combustion cycle. Each stroke corresponds to a different phase of the cycle.
1. Intake Stroke:
- The intake valve opens.
- The piston moves downwards, creating a vacuum in the cylinder.
- A mixture of fuel and air is drawn into the cylinder through the intake valve.
2. Compression Stroke:
- Both intake and exhaust valves are closed.
- The piston moves upwards, compressing the air-fuel mixture.
- As the mixture is compressed, its temperature and pressure increase.
3. Power Stroke (Expansion Stroke):
- At the end of the compression stroke, the spark plug ignites the air-fuel mixture, causing a controlled explosion.
- The expanding gases push the piston downwards, generating power.
4. Exhaust Stroke:
- The exhaust valve opens.
- The piston moves upwards, pushing the exhaust gases out of the cylinder through the exhaust valve.
- Both intake and exhaust valves remain open briefly to allow for any remaining gases to escape.
Key Features:
- The cycle repeats itself continuously, producing a sequence of power strokes.
- The valves control the timing of the stroke events.
- The ratio of the compression stroke volume to the power stroke volume is called the compression ratio, which affects engine efficiency.
Advantages:
- Efficient use of fuel
- High power output
- Smooth operation
Disadvantages:
- Requires a complex and precisely timed valve system
- Can be more expensive to manufacture compared to two-stroke engines
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