This is my final year seminar presentation on HCCI Engine presented by me at SKIT, Jaipur. This presentation contains a basic introduction of HCCI Engine. Some of the contents are copied from various websites so some details are subjected to copyright law. I am using these information only for the educational purpose

1. Homogeneous Charged Compression Ignition
Engine (HCCI)
Submitted By:
Shree Ram Sharma
12ESKME401
Voice: +91 9610078700
Email-ssrsharma08@gmail.com
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)
1

2. 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, September 7,
2016
Shree Ram Sharma
(12ESKME401) 2
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering

3. 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

4. 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 engine
Unburned Hydrocarbons
Carbon Monoxide
Nitrogen Oxides
Particulates ( Soot )
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 4
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering

5. 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.
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 5
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering

6. Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 6
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering
Fig. 2 : Comparison of Engines

7. No flame, combustion due to compression heating
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 7
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering
Fig. 3 : Working of HCCI Engine

8. Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 8
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering
Fig. 4 : Pressure analysis in Cylinder

9. 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.
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 9
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering

10. Disadvantages
• Higher cylinder peak pressures may damage the
engine.
• Auto-ignition is difficult to control.
• HCCI Engines have a smaller power range.
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 10
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering

11. Challenges and Solutions
• Controlling of Ignition
using a VVT mechanism.
controlling fuel-air ratio
inducted gas temperature
• Extending the Operating Range to High Load
Dual Mode Operation
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 11
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering

12. 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.
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 12
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering

13. 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
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 13
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering

14. 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.
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 14
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering

15. Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 15
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering
Fig. 5 : Opel Vectra with modified HCCI engines

16. The Future of HCCI
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 16
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering
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

17. 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.
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 17
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering

18. 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/ne
w-combustion-technology-082707.jsp
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 18
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering

19. Thank You
Wednesday, September 7,
2016
Shree Ram Sharma
(12ESKME401) 19
Swami Keshvanand Institute of Technology, Management & Gramothan,
Department of Mechanical Engineering