Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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Effect of D-Range Neutral Control of Automatic Transmission on LA-4 Mode Fuel Economy

정지구간에서 자동변속기 D단 중립 제어가 LA-4 모드 주행 연비에 미치는 영향

  • Wi, Hyo-Seong (Automotive Powertrain System Lab., Ajou University) ;
  • Jung, Youn-Sik (Automotive Powertrain System Lab., Ajou University) ;
  • Park, Jin-Il (School of Mechanical Engineering, Ajou University) ;
  • Park, Kyoung-Seok (School of Mechanical Engineering, Kumoh National Institute of Technology) ;
  • Lee, Jong-Hwa (School of Mechanical Engineering, Ajou University)
  • Published : 2009.01.01
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Abstract

This paper focuses on vehicle fuel economy improvement using D-Range neutral control of automatic transmission. The system objected to reducing of fuel consumption during idle. Usually, turbine of conventional auto transmission is mechanically linked to wheel during idling condition. Therefore speed ratio of torque converter is zero for that period. This causes needless power loss by the torque converter slip. To improve this inefficiency automobile makers develops electronically-controlled D-range neutral control system. The D-range neutral control system minimizes slip on the torque converter by shifting gear to a neutral position during vehicle stoped with D-range gear position. However there's insufficient study about the effect of D-range neutral control system on vehicle fuel economy. In this paper, researches are performed on effect of D-range neutral control system on vehicle fuel economy by experiment with two different vehicle. And it is also estimated the effect on vehicle fuel economy using computer simulation. As a result, 1.8% of LA-4 mode fuel economy improvement can be achieved in a vehicle by D-range neutral control system.

Keywords

References

  1. Y. Ito and H. Sato, "Development of an Electronically-Controlled Four-Speed Automatic Transmission with a D-Range Neutral Control System," Seoul 2000 FISITA World Automotive Congress, 2000
  2. H. Song, J. Lee, K. Kim, J. Yoo, B. Rhee and K. Min, Modeling and Experiments for the Breakdown of Fuel Consumption in Passenger Car, Ph. D. Dissertation, Ajou University, 2002
  3. J. Yoo, H. Song, J. Lee, J. Yoo, Y. Park and K. Park, "An Experimental Study on Breakdown of Fuel Consumption on a Component Basis in Gasoline Engine Vehicle," Transactions of KSAE, Vol.12, No.1, pp.153-161, 2004
  4. N. K. Kim, J. H. Lee, J. S. Yoo and J. I. Park, Effect of the Accessories Driving Power on Vehicle Fuel Economy, M. S. Thesis, Ajou University, 2005