Journal of Mechanical Science and Technology

, Volume 19, Issue 12, pp 2321–2329 | Cite as

A study on the engine downsizing using mechanical supercharger

  • Jae-Il Bae
  • Sin-Chul Bae


One means of fulfilling CO2 emission legislation is to downsize engines by boosting their power using turbochargers or mechanical superchargers. This reduces fuel consumption by decreasing the engine displacement. When a turbocharger, which is preferable to a mechanical supercharger in terms of fuel efficiency, is used, there is insufficient availability of exhaust gas energy at low engine speeds, resulting in an unfavorable engine response. Therefore, mechanically driven superchargers have increased in popularity due to their quick response to changing speeds in the transient phase. However, since a mechanical supercharger obtains its driving power from the engine, it is difficult to decrease its fuel consumption. This remains a large negative factor for superchargers, despite their excellent dynamic performance. This study aims to develop a power control concept to improve the fuel economy of a mechanical screw supercharger, which could then be used for engine downsizing.

Key Words

Screw Supercharger Inlet throttle Body External bypass Valve Internal Bypass Valve 



External bypass valve


Internal bypass valve


Inlet throttle body


Engine speed (rpm)


Supercharger speed (rpm)


Inlet pressure (kPa)


Outlet pressure (kPa)


Discharge pressure (kPa)


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Copyright information

© The Korean Society of Mechanical Engineers (KSME) 2006

Authors and Affiliations

  1. 1.Graduate School, Department of Mechanical EngineeringDankook UniversityYongsan-guKorea
  2. 2.Department of Mechanical EngineeringDankook UniversityYoungsan-guKorea

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