Abstract
For the purpose of engineering development for a new 8-step speed automatic transmission, a simplified dynamic model for this gearbox was established and key parameters which affected the shift quality were analyzed. Aiming at four different shift types, the ideal characteristics of shift clutch and engine control were set up. By using torque estimation method, PI slip control algorithm and engine coordinated control principle, the control model and transmission controller were well developed for three shift phases which included rapid-fill phase, torque phase and inertia phase. The testing environment on the rig and prototype vehicle level was built and the testing results obtained in ultimate condition could verify the accuracy and feasibility of this shift control strategy. The peak jerk during shift process was controlled within ±2 g/s where the smooth gearshift was obtained. The development proposal and algorithm have a high value for engineering application.
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Foundation item: Project(51105017) supported by the National Natural Science Foundation of China; Project(2011BAG09B00) supported by the National Science and Technology Support Program of China; Project(2010DFB80020) supported by the Technology Major Project of the Ministry of Science and Technology of China
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Lu, X., Wang, Sh., Liu, Yf. et al. Application of clutch to clutch gear shift technology for a new automatic transmission. J. Cent. South Univ. 19, 2788–2796 (2012). https://doi.org/10.1007/s11771-012-1343-4
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DOI: https://doi.org/10.1007/s11771-012-1343-4