Homogeneous Charged Compression Ignition Engine (HCCI Engine)

1

Homogeneous Charged Compression Ignition Engine (HCCI)

Submitted By:Shree Ram Sharma12ESKME401Voice: +91 [email protected]

Swami Keshvanand Institute of Technology, Management & Gramothan

Guided By:Mr. Praveen Saraswat(Sr. Lecturer ME SKIT)

Submitted to:Mrs. Sarita Choudhary(Reader ME)Mr. Dinesh Kumar Sharma(Sr. Lecturer)

Contents • What is HCCI Engine ?• Need of HCCI Engine• Working Principle• Advantages and Disadvantages• Challenges and Solutions• Variable Valve Timing• Dual mode transitions• Prototypes of HCCI Engine• Conclusions• Reference

Wednesday, May 3, 2023 Shree Ram Sharma (12ESKME401) 2

Swami Keshvanand Institute of Technology, Management & Gramothan, Department of Mechanical Engineering

What is HCCI Engine?

• HCCI is a form of internal combustion in which the Homogeneous Charge is compressed to the point of auto ignition.

• HCCI incorporates the best features of both spark ignition (SI) and compression ignition (CI)

• As in an SI engine, the charge is well mixed, which minimizes particulate emissions.

• As in a CI engine, the charge is compression ignited and has no throttling losses, which leads to high efficiency.

Fig. 1: SI and HCCI Engine

Need of HCCI Engine

• Develop a means to reduce unwanted emissions that come from Internal Combustion Engines (ICE) And increase fuel economy.

• To reduce from exhaust of engineUnburned HydrocarbonsCarbon MonoxideNitrogen OxidesParticulates ( Soot )



Working Principle HCCI is characterized by the fact that the fuel and

air are mixed before combustion starts and the mixture auto-ignites as a result of the temperature increase in the compression stroke

Optical diagnostics research shows that HCCI combustion initiates simultaneously at multiple sites within the combustion chamber and that there is no

flame propagation.





Fig. 2 : Comparison of Engines

No flame, combustion due to compression heating



Fig. 3 : Working of HCCI Engine



Fig. 4 : Pressure analysis in Cylinder

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.



Disadvantages

• Higher cylinder peak pressures may damage the engine.

• Auto-ignition is difficult to control.

• HCCI Engines have a smaller power range.



Challenges and Solutions• Controlling of Ignition

using a VVT mechanism.controlling fuel-air ratioinducted gas temperature

• Extending the Operating Range to High Load Dual Mode Operation



Variable Valve Timing (VVT)

• This method gives finer control within combustion chamber, involves controlling the effective pressure ratio.

• It controls the quantity of retained or trapped exhaust to increase the temperature of air fuel mixture.



Dual Mode Operation

• Practical HCCI engines will need to switch to a conventional SI or diesel mode at very low and high load conditions due to dilution limits

• Two modes: HCCI-DI dual mode HCCI-SI dual mode



HCCI Engine Prototypes

• General Motors has demonstrated Opel Vectra and Saturn Aura with modified HCCI engines.

• Mercedes-Benz has developed a prototype engine called Dies Otto, with controlled auto ignition. It was displayed in its F 700 concept car at the 2007 Frankfurt Auto Show.





Fig. 5 : Opel Vectra with modified HCCI engines

The Future of HCCI



The future of HCCI looks promising specially with partial HCCI mode.Major companies such as GM, Mercedes-Benz, Honda, and Volkswagen have invested in HCCI research.

Table 1: HCCI used by various companies

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”.

• HCCI Engines still needs a lot of development.



References

• “Homogeneous Charge Compression Ignition” http://en.wikipedia.org/wiki/homogeneouschargecompressionignition.htm March, 2016

• “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



http://en.wikipedia.org/wiki/homogeneouschargecompressionignition.htm

http://www.gm.com/experience/fuel_economy/news/2007/adv_engines/new-combustion-technology-082707.jsp

http://www.gm.com/experience/fuel_economy/news/2007/adv_engines/new-combustion-technology-082707.jsp

Thank You



Homogeneous Charged Compression Ignition Engine (HCCI Engine)

Engineering

Transcript of Homogeneous Charged Compression Ignition Engine (HCCI Engine)