K10881 (chinmay sharma) i.c.engine
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Topic:- Homogeneous Charge Compression Ignition (HCCI) Engines Subject:- I.C. Engine Submitted To, Submitted by, Mr. Amardeep Sir Chinmay Sharma UID:- K-10881 Sem./ Year:- 6 th / 3 rd
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Transcript of K10881 (chinmay sharma) i.c.engine
Topic:- Homogeneous Charge Compression Ignition (HCCI) Engines
Subject:- I.C. EngineSubmitted To, Submitted by,Mr. Amardeep Sir Chinmay Sharma
UID:- K-10881Sem./ Year:- 6th / 3rd
What is an HCCI Engine?
• HCCI is a form of internal combustion in which the fuel and air are compressed to the point of auto ignition.
• That means no spark is required to ignite the fuel/air mixture
• Creates the same amount of power as a traditional engine, but uses less fuel.
Traditional combustion (left) uses a spark to ignite the mixture. HCCI (right) uses piston compression for a more complete ignition.
How Does It Work?• A given concentration of fuel and
air will spontaneously ignite when it reaches its auto-ignition temperature.
• The concentration/temperature can be controlled several ways:– High compression ratio– Preheating of induction gases– Forced induction– Retaining or reintroducing exhaust
gases
Click here for a nice animation of an HCCI engine in action!
Advantages
• Can achieve up to 15% fuel savings
• Lower peak temperature leads to cleaner combustion/lower emissions
• Can use gasoline, diesel, or most alternative fuels
HCCI automobiles could reduce greenhouse gas emissions
Disadvantages
• Higher cylinder peak pressures may damage the engine
• Auto-ignition is difficult to control
• HCCI Engines have a smaller power range
Prototype HCCI car from Saturn
The Future of HCCI
• The future of HCCI looks promising
• Major companies such as GM, Mercedes-Benz, Honda, and Volkswagen have invested in HCCI research.
• Preliminary prototype figures show that HCCI cars can achieve in the area of 43 mpg
Works Cited• “Homogeneous Charge Compression Ignition”
http://en.wikipedia.org/wiki/Homogeneous_Charge_Compression_Ignition November, 2008.
• “New HCCI Engine” http://videos.howstuffworks.com/multivu/3284-new-hcci-engine-video.htm November, 2008
• “GM Takes New Combustion Technology Out of the Lab and Onto the Road” http://www.gm.com/experience/fuel_economy/news/2007/adv_engines/new-combustion-technology-082707.jsp
