CONTROLLER OF AUTOMATIC TRANSMISSION AND ITS METHOD

摘要

PROBLEM TO BE SOLVED: To maintain shift change feeling constantly while correcting errors between an instruction hydraulic pressure provided for a control formula and an actual hydraulic pressure which really exists, with a less calculation amount than a feedback control. Ž

SOLUTION: Instruction hydraulic pressures Pdbof respective phases except for a last phase and the actual hydraulic pressure Patas output from a fed hydraulic pressure sensor 8 are compared. When an excessive response state is detected, a corrected instruction hydraulic pressure Pdbof a next phase is set as addition of an instruction hydraulic pressure Pdbbefore correction and a correction hydraulic pressure Paj and a control is conducted by a control formula of the next phase corresponding to the correction hydraulic pressure Pajwhich is the difference between the instruction hydraulic pressure Pdbgenerated in the phase and the actual hydraulic pressure Pat. When a response delay state is detected, control of the next phase is started, an inflection point a of the actual hydraulic pressure Patis detected and a control is conducted by a control formula of the next phase, a corrected instruction hydraulic pressure Pdbof the next phase is set as the difference between the instruction hydraulic pressure Pdbbefore correction and the correction hydraulic pressure Pajcorresponding to the correction hydraulic pressure of difference of the instruction hydraulic pressure Pdbof the phase and the actual hydraulic pressure at the inflection point a. Ž

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