TRANSIENT PERFORMANCE OF AN SI ENGINE BY TRANSIENT RESPONSE SPECIFICATIONS

  • Kwark, J.H. (School of Mechanical Engineering, RIMT, Busan National University) ;
  • Jeon, C.H. (School of Mechanical Engineering, RIMT, Busan National University) ;
  • Chang, Y.J. (School of Mechanical Engineering, RIMT, Busan National University)
  • Published : 2003.09.01

Abstract

The analysis and evaluation of the transient performance by the transient response specifications under various acceleration speeds and types based on driver's typical acceleration habit are implemented by the experimental study to provide the appropriate direction for the transient control in a gasoline engine. The concept of the transient response specifications which consist of delay time, rising time, maximum overshoot and settling time, and the analysis method using them are introduced to evaluate the characteristics of the transient performance quantitatively. Furthermore four acceleration speeds and four acceleration types are set respectively to realize the various transient states which are similar to the real drive. Several performance parameters in terms of engine speed, manifold absolute pressure, fuel injection duration and air excess ratio are measured simultaneously during the various acceleration using a throttle actuator controlled by a PC. The transient response specifications characterized well the transient performance for the various acceleration speed and types quantitatively. Delay and rising time with increment of the acceleration speed became shorter, but settling time did longer. Intensified acceleration type appeared to be the most economical in view of fuel consumption, and linear acceleration type was found to have the least harmful emission concentration.

References

  1. Benninger, N. F. and Plapp, G. (1991). Requirements and performance of engine management systems under transient conditions. SAE Paper No. 910083
  2. Cho, G. S. and Chung, Y. J. (1996). Effect offuel injection timing on the performance characteristics in an SI engine. Trans. KSAE 4, 6, 144-152
  3. Cho, G. S. and Ryu, J. I. (1993). Evaluation oftransient of perfbrmance of carburettered gasoline engine. Trans. KSAE 1, 3, 1-11
  4. Hilliard, J. C. and Sprinter, G. S. (1998). Fuel Economy, Plenum Press, New York
  5. Hiroyuki, K. (1985). Improving technology of an engine during transient period. Joumal of JSAE 39, 9, 1001-1007
  6. Kwark, J. H., Jeon, C. H. and Chang, Y. J. (2000). A study on the analysis and evaluation of transient performance in a MPI gasoline engine. Seoul 2000 FISITA Consress, Seoul, Korea
  7. Lee, J. S. and Jo, S. G. (1992). Air-fuel ratio variation in accelerating and decelerating by injectors. Proceeding of 1992 KSAE Spring Conference, 38-44
  8. Lenz, U. (1997). Transient Air-fuel ratio control using artificial intelligence. SAE Paper No. 970618
  9. Ministry of Science and Technology (1987). Develop-ment of EIectronic Control System for Domestic Vehicle, Seoul, Korea
  10. Ministry of Science and Technology (1991). Mecha-tronic Control System of Engine (3), Seoul, Korea
  11. Sim, H. S. and Chung, S. H. (2002). Comparison of hydrocarbon reduction in a SI engine between continuous and synchronized secondary air injections. Int. J. Automotive Technology 3,1, 41-46
  12. Yukio, H. and Hiroshi, T. (1982). The evaluation method of an engine performance in transient period (1). Trans. JSAE 25, 19-27
  13. Yukio, H. and Hiroshi, T. (1984). The evaluation method of an engine performance in transient period (2). Trans. JSAE 28, 3-10