Simplifying CNG dual fuel application in transport engines

This project was concerned with the development of closed loop control systems technology for the dual fuelled transport diesel engine. Special emphasis was placed on the application to diesel-NGV (natural gas vehicle) systems, although the technology might have as wide application to diesel- LPG. The first object was to eliminate combustion knock and its dangerous consequences by detecting the onset of knock and then providing information to the engine's microprocessor controller that would initiate a reduction in gas supply and an increase in diesel fuel rate thus eliminating knock. The benefit is that of more attractive operating economics and increased safety. The second object is the detection of poor combustion at light load operation leading to the prevention of inefficient and uneconomic operation, with the additional environmental benefit of maintaining reduced greenhouse gas emissions compared with the conventional diesel engine. Both objectives have been achieved, but the durability of the equipment used for the second strategy is unvalidated because of difficulties in removing soot and aerosols from the exhaust gas to which the solid state sensor is exposed. The incipient knock detector has been shown to successfully work on dual fuel IDI, DI diesel engines and on a diesel engine converted to NG spark ignition. Whilst the knock system's durability is not in doubt, further work in proving the durability of both systems is desirable.


  • English

Media Info

  • Pagination: 16p

Subject/Index Terms

Filing Info

  • Accession Number: 01432618
  • Record Type: Publication
  • Source Agency: ARRB
  • ISBN: 0642165238
  • Report/Paper Numbers: 91/80
  • Files: ATRI
  • Created Date: Aug 24 2012 5:08PM