DESIGN AND CHARACTERISTICS ON ELECTRIC SUPERCHARGER FOR DIESEL ENGINE ACCELERATION

BY ADDITIONAL AIR RAPID INJECTION

YAO Chunde  ZHOU Hongxiu

(State Key Laboratory of Engine, Tianjin University, Tianjin 300072)

Abstract: The electric supercharger driven by a brushless motor with high-speed is developed to solve the problem of acceleration smoke caused by the turbocharger sluggish response. Its rotate speed is from 6.0 r/min to 24.0 kr/min, and the maximum flux is 0.1 kg/s. The structure design of the electric supercharger is novel, which makes it dispensable to set the lubricating installation and easy to assemble. The velocity distribution at the outlet of the electric supercharger is determined by hot-wire anemometry under various rotate speeds in steady state. Further more, the trends of the flux and charge rate with various speeds are analyzed. In addition, the transient response is detected from motor setup to smooth running within 10 s, 15 s, 20 s and 25 s respectively, and the characteristic of the transient flux is on pilot study. Research results indicate that the electric supercharger can respond rapidly with the great flux, and it is independent of the operating conditions of diesel engine. So it is a feasible way to reduce the smoke emission and improve the acceleration performance.

Key words: Electric supercharger  Hot wire anemometry  Flux characteristic  Transient state

CLC No: TK42

Received 20050716, received in revised form  20051229