COLD START CHARACTERISTICS STUDY BASED ON REAL TIME NO EMISSIONS IN AN LPG SI ENGINE

Abstract

Normally, cylinder pressure was used as a criterion of combustion occurrence, while in some conditions, it may be unreliable when identifying lean mixture combustion. This is particularly important for fuels like liquefied petroleum gas, which has good capacity for lean combustion. In this study, a fast response NO detector, based on the chemiluminescence method, was used to measure real time NO emissions in order to evaluate the technique as a criterion for establishing combustion occurrence. Test results show that real time NO emissions can be used to identify the cylinder combustion and misfire occurrence during engine cranking, and real time NO emissions can be used to understand the combustion and misfire occurrence. Real time NO emissions mostly happened in first several cycles during cold start, and NO emissions increased with the spark timing advancing.

Keywords

Dates

  • Submission Date2009-12-02
  • Revision Date2010-02-17
  • Acceptance Date2010-09-17

DOI Reference

10.2298/TSCI1004937Z

References

  1. Henein, N. A., Tagomori, M. K., Cold-Start Hydrocarbon Emissions in Port-Injected Gasoline Engines, Progress in Energy and Combustion Science, 25 (1999), 6, pp. 563-593
  2. Li., L., et al. The Cold Start Research Based on the Controllable Firing Cycle in an EFI Gasoline Engine, The Automobile Engineering, 26 (2004), 4, pp. 417-422
  3. Cheng, Y., et. al., Analysis of Combustion Behavior during Cold-Start and Warm-up Process of SI Engine, SAE paper 2001-01-3557, 2001
  4. Huang, Z., et al., The Study of the Unburned HC Process during Cold Start and Idle in a SI Engine, Combustion Science and Technology, 3 (1997), 4, pp. 406-411
  5. Huang., Z., et al., The Effects of the Oxygen Fuel on Unburned HC during Cold Start and Idle in a SI Engine, Small Internal Combustion Engine, 27 (1998), 5, pp. 1-4
  6. Cheng., Y., et al., The Study of Reduction of HC Emissions During Cold Start and Warm-up in Gasoline Engine, Internal Combustion Engine Transaction, 20 (2002), 4, pp. 292-296
  7. Peckham, M. S., Collings, N., Simultaneous Fast Response NO and HC Measurements from a Spark Ignition Engine, SAE paper 971610, 1997
  8. Peckaham, M. S., Hands, T., Burell, J., Real Time In-Cylinder and Exhaust NO Measurements in a Production SI Engine, SAE paper 980400, 1998
  9. Hands, T., Peckham, M., Campbell, B., Transient SI Engine Emissions Measurements on the FTP75 Drive Cycle with a Fast Response CO Instrument, SAE paper 2001-01-3540
Volume 14, Issue 4, Pages939 -942