Skip to main content
Article thumbnail
Location of Repository

Design and investigation of a diesel engine operated on pilot ignited LPG

By Eudoxios Theodoridis


This thesis explores the idea of igniting LPG in a compression ignition diesel engine using pilot diesel injection as spark ignition medium. The main advancement in using this technology on current diesel engines is the establishment of a better balance between NOx and PM emissions without losing too much of the CO2 benefits of diesel. With the advent of common rail diesel engines, it is now possible to get control of pilot diesel injection and make the LPG and diesel control systems work together. Combined diesel and LPG operation is a new subject for engine research, so the thesis moves on to consider the results from detailed engine simulation studies that explore the potential benefits of the mix. Subsequent simulations of a modern four cylinder dCi engine suggest that with closer control over the pilot diesel injection, diesel like performance can be obtained, hopefully with less emissions than currently expected from diesel only operation. A single cylinder variable compression ratio research engine was developed to explore diesel /LPG dual fuel operation. A second generation common rail injection rig was also developed for the engine and for fuel spray characterisation. Engine experiments proved the concept of using a modest charge of pilot injected diesel for igniting a larger dose of port injected LPG. The experimental work results suggest that combining diesel common rail injection technology with the state of the art LPG injection systems, it is possible to establish a better balance between NOx/ PM emissions without losing too much of the CO2 benefits from the diesel operation

Publisher: Cranfield University
Year: 2009
OAI identifier:
Provided by: Cranfield CERES

Suggested articles


  1. (2004). 03 25). Retrieved from vcacarfueldata:
  2. (1970). Automotive Engine Design.
  3. (2001). Bosch Sensors. Robert Bosch GmbH Automotive Aftermarket. doi
  4. (2001). Characterization of the LPG-diesel, dual-fuel combustion. doi
  5. (2004). Comparison of combustion characteristics between natural gas and methanol in a dual fuel diesel engine .
  6. (1987). Comparison of methods for the calculation of mass fraction burnt from engine pressure time diagrams. doi
  7. (2002). Diesel engine management 2nd edition.
  8. (1999). Diesel engine reference book second edition.
  9. (1986). Diesel engines Reference Book. doi
  10. (2002). Diesel passenger car and light commercial vehicle markets in Western Europe. Retrieved
  11. (2004). Diesel-Engine Management. doi
  12. (2003). Diesel/LPG Combustion Studies. Mechanical Engineering.
  13. (2002). Digital imaging based analysis and characterisation of diesel sprays. Fuel injection systems. One birdcage walk,
  14. (2001). Engine Combustion instrumentation and diagnostics. US: doi
  15. (1997). Engine performance and exhaust characteristics of DI diesel engine oerated with DME. doi
  16. (1999). Engine Testing
  17. (2002). Engine thermofluids Volume 3 Page 9. Notes to accompany the MSc course .
  18. (2006). Experimental Investigation of Diesel HCCI Using a Ricardo E6 Single Cylinder Engine .
  19. (2004). Hybrid technology: future of automobiles. Proceeding of international conference on vehicle alternative fuels and environmental protection.178
  20. (2006). Injector control unit design.
  21. (1988). Internal Combustion Engine Fundamentals. United States:
  22. (1999). Introduction to internal combsution engines 3rd edition.
  23. (2009). LPG Carbon Footprint Relative to Other Fuels. A Scientific Review. Retrieved
  24. (2003). Mitsubishi motors. Retrieved 2003, from
  25. (2006). MSc Thesis 'Experimental Investigation of Diesel HCCI using a Ricardo E6 Single cylinder engine'. Bedfordshire:
  26. (2000). Multidimensional modeling of ignition, combustion and Nitric oxides formation in direct injection natural gas engine. SAE . doi
  27. (2004). Overcoming power loss in LPG/Propane and CNG conversions of vehicle engines.
  28. (2002). Pathways to alternative fuels into future.
  29. (2003). Performance and emissions of a DI diesel engine operated with LPG and cetaneenhancing additives. doi
  30. (2004). Retrieved from
  31. (2004). Simultaneous reduction on NOx and Smoke by port injection of methanol/water blend in a DI diesel engine. doi
  32. (1949). Status of dual fuel engine development. doi
  33. (2001). Study on homogenous premixed charge CI engine fuelled with LPG. doi
  34. (2004). The gaseous fuel option: LPG and CNG.
  35. (1999). The internal combsution engine in theory and practice volume two.
  36. (2002). The potential of HCCI combsution for high efficiecy and low emissions. SAE . doi
  37. (1979). Thermodynamic Analysis of Combustion Engines. doi
  38. (2003). Visualization of the effects of post injection and swirl on the combsution process of a passenger car common rail DI diesel engine. doi

To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.