Passenger cars claim their presence in market by its pick up, top speed and maximum power of the engine. The study described in this paper is focused on improving the low-end performance of a 4-cylinder 1.6 L diesel engine while meeting the targeted maximum power.To meet the cause turbocharger works as an important element of the engine. A comparative study between regulated two stage turbocharger (R2S) and variable geometry turbocharger (VGT) shows that on a 4-cylinder engine VGT is superior by providing higher boost at 1000 engine rpm full load, than R2S, while in 3-cylinder (same displacement) the opposite effect can be seen. After simulations and iterations, it was confirmed that the in 4-cylinder the exhaust pulse cancellation were leading to a lesser exhaust energy at the turbine inlet. This pulse interaction leads to higher residual gas content which affects the low-end performance.In continuation with VGT for 4-cylinder engine several iterations were made with different compressor trims to improve the efficiency of the turbocharger which lead to 25% increment in low end torque. Also ported shroud technology is implemented to enhance the surge margin for a better tip in and tip out behavior at vehicle level. The same is further improved by changing the intake suction layout to a D cross section.To enhance the performance and meet the target torque, exhaust valve timing was modified to reduce the overlap between two consecutive exhaust strokes. This ensures no exhaust pulse interaction and improves the low-end performance. This did not affect much the high-end performance of the engine. The final iteration also helped in significant reduction in smoke at engine level in steady state operation.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Thermodynamic Analysis of Turbocharger for a High Power Density Diesel Engine


    Additional title:

    Sae Technical Papers



    Conference:

    Symposium on International Automotive Technology 2019 ; 2019



    Publication date :

    2019-01-09




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Thermodynamic Analysis of Turbocharger for a High Power Density Diesel Engine

    Jain, Praveer Kirtimohan / Pandi, Chendil / Ravi, Utkarsh et al. | British Library Conference Proceedings | 2019


    Diesel engine turbocharger performance monitoring using vibration analysis

    Ascanio,G.M. / Wang,W.J. / Univ.of Sussex,GB | Automotive engineering | 2007


    109 Ceramic Diesel Engine with Turbocharger

    Miyagi, Yasuo / Tsukada, Yuji / Nishikawa, Kazumi et al. | TIBKAT | 1989



    Diesel Engine Turbocharger Performance Monitoring using Vibration Analysis

    Ascanio, G.M. / Wang, W.J. / Society of Automotive Engineers | British Library Conference Proceedings | 2007