Control method of torque ratio during power on downshift of electronically controlled automatic transmission.

摘要

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a torque ratio control method for a power on down shift applied to an automatic transmission of an automobile, A first step of: A second step of determining whether the operating condition is satisfied using the throttle opening degree and the differential value in the power on shift mode in the first step; A third step of calculating the turbine speed of the torque converter by reading the torque ratio corresponding to the differential value of the throttle opening degree when the operating condition is satisfied in the second step; A fourth step of causing the transmission control unit to transmit data relating to the turbine rpm and the torque ratio obtained in the third step to the engine control unit; A fifth step of correcting the turbine rpm and the torque ratio transmitted from the shift control unit to the torque ratio of the current engine; A sixth step of calculating a target engine speed from various sensor inputs and the corrected torque ratio obtained in the fifth step; And a seventh step of performing fuel injection and ignition timing control of the engine as the target engine speed obtained in the sixth step to control the engine in the engine control unit according to the torque ratio determined in the shift control unit, Not only the initial acceleration acceleration performance can be improved but also the hunting of the damper clutch can be prevented and the durability of the damper clutch can be improved by avoiding the use of the damper clutch.