| 摘要 |
PROBLEM TO BE SOLVED: To prevent a shift shock at shift-down time in a power-off condition by automatically adding braking force until a prescribed time passes after shift-down is completed from foreseeing time by foreseeing information on the shift-down of an automatic transmission, and reducing an adding quantity of the braking force when the shift-down is performed. SOLUTION: A target speed change stage preset in a storage device of an electronic control unit(ECU) 10 is read out according to car speed of a car speed sensor 12 and accelerator opening by an accelerator opening sensor 22, and is supplied to a corresponding solenoid valve in an oil pressure controller 6, and speed change is attained. Fuzzy inference is realized in the ECU 10, and when shift-down is foreseen, a brake actuating signal is gradually supplied to a brake control unit 60, and the shift-down is performed after a prescribed time passes, and since addition of braking force is interrupted for a speed change period simultaneously when the shift-down is started, a speed reduction difference between pre-speed change time and speed change time is reduced, and a shift shock can be sharply reduced. |
