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A Study on the Quantitative Assessment Method for Shift Quality of Automatic Transmission in a Wheel Loader

휠로더 자동변속기의 변속품질 평가 방법에 관한 연구

  • 이종찬 (현대중공업㈜ 지능기계연구실) ;
  • 김관수 (현대중공업㈜ 지능기계연구실) ;
  • 임종형 (현대중공업㈜ 지능기계연구실) ;
  • 이효원 (현대중공업㈜ 지능기계연구실) ;
  • 권영민 (현대중공업㈜ 지능기계연구실) ;
  • 김형준 (현대중공업㈜ 건설장비사업본부) ;
  • 이민희 (현대중공업㈜ 건설장비사업본부)
  • Published : 2008.07.01

Abstract

The quality of the automatic transmission shift for a wheel loader has been generally evaluated by driver's perception. However the subjective evaluation of the drivers is not always directly related to the shift quality. It is necessary to set up the method for an objective assessment of the shift quality. In this paper, a quantitative assessment method has been developed for the shift quality of the automatic transmission in a wheel loader. The indices for the evaluation were selected through the various tests like the acceleration and the turbine rpm as well as the subjective evaluation of the driver, and were validated by the correlation between subjective and objective assessments using a psychophysical power law. Based on this method, the shift quality of a wheel loader has been evaluated quantitatively under various shift conditions.

Keywords

Shift Quality;Frequency Weighting Functions;Shift Time;Turbine rpm Rate;VDV(Vibration Dose Value)

References

  1. Jung, B.H., 2005, “Analysis of Shift Quality of a Power Shift Transmission Using Driving Axle Torque,” Seoul Nationl University
  2. Kim, M. S., Kim, Y. T., Moon, W. K., Ahn, S. J., Yoo, W. S., 2006, “Correlation Between Subjective and Objective Assessments of Whole-body vibration in a Passenger Car” The KSME Fall Annual Metting, pp.849-854
  3. Kim. K. S., Lee. J. C., 2006, “Quantitative Evaluation Technology of Shift Quality for Wheel Loader Automatic Transmission,” HEMRI-06-AB-077 Technical Report
  4. International Organization for Standardization, ISO 2631-1, 1997, Mechanical Vibration and Shock Evaluation of Human Exposure to Whole-Body Vibration
  5. British Standards BS 6841, 1987, Measurement and Evaluation of Human Exposure to Whole-Body Mechanical Vibration and Repeated Shock
  6. Schwab, Leo F., 1994, “Development of a Shift Quality Metric for an Automatic Transmission,” SAE Paper Number 941009
  7. Stevens, S. S., 1951, Handbook of Experimental Psychology, Wiley, New York
  8. Ken Horste, 1995, “Objective Measurement of Automatic Transmission Shift Feel Using Vibration Dose Value,” SAE Paper Number 951373

Cited by

  1. Influence of a clutch control current profile to improve shift quality for a wheel loader automatic transmission vol.18, pp.2, 2017, https://doi.org/10.1007/s12541-017-0027-2