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International Journal of Automotive Technology 2003;4(3): 109-117. |
| TRANSIENT PERFORMANCE OF AN SI ENGINE BY TRANSIENT RESPONSE SPECIFICATIONS |
| J. H. KWARK, C.-H. JEON, Y.-J. CHANG |
| Busan National University |
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| ABSTRACT |
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The analysis and evalutaion of the transient performance by the transient response specifications under various acceleration speeds and types based on driver's typical acceleration havit 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 varioustransient states thich 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 concentraion. |
| Key Words:
Transient performance, Transient response specifications, Valve opening speed, Acceleration type |
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