HOMOGENEOUS CHARGE

COMPRESSION IGNITION ENGINES

• By:

GANESH

USN:1NH14MMD14

CLASSIFICATION

• Spark Ignition System

• Laser Ignition System

• Homogeneous Charge Compression Ignition System

SPARK PLUG IGNITION

SYSTEM

LASER IGNITION SYSTEM

• Process of combustion by the pulse of laser light

• Works same as that of spark ignition

HCCI SYSTEM

• Fuel injected via fuel injectors air

induction is achieved independently.

• Fuel and air have been fully introduced and mixed

• Heat generated and combustion takes place.

WHAT IS HCCI??

• Gives efficiency as high as

compression ignition.

• Produces less oxides of

nitrogen an particulate matter.

• Works on dilute fuel mixture.

• Low pressure fuel injection.

WORKING OF HCCI

Exhaust port closes before next stroke

begins

HCCI ENGINE DESIGN

• Variable Compression Ratio

• Supercharging and Turbocharging

• Fuel injection

DEVELOPMENT IN HCCI

• Ignition control

• Combustion rate Control at High load

• Cold-start

• Emission Control

APPLICATION OF HCCI

• Nissan modulated kinetic system

Low-Temperature Combustion

Late injection

• Honda AR Motorcycle engine

Cylinder liner having an end

extension

Works as a spark ignition engine at

high loads

HUSQVARNA

• Partial HCCI System.

• Two stroke engine is used.

• Exhaust port is blocked very early

SPARK IGNITER VS. HCCI IGNITER

0%

5%

10%

15%

20%

25%

30%

35%

40%

45%

50%

THERMAL Efficiency CO2 CONTENT

Spark Igniter

HCCI Igniter

SPARK IGNITER VS. HCCI IGNITER

ADVANTAGES AND DIS-ADVANTAGES

Advantages

• 15% increase in fuel efficiency.

• Compatible with gasoline as fuel.

• Fuel is burned quicker and at low temperature.

Dis-Advantages

• High Cylinder Pressure.

• Limited power range.

• Combustion is defficult to control.

CONCLUSION

• HCCI can be used as an alternative engine for CI and SI

engines.

• On application 10-15% of thermal efficiency can be

increased.

• Help full for “Go Green”