Patent ID: 6843756
Filing Date: 2005-01-18
Classification: F16H,Y10T

Abstract:
1. A downshift control apparatus of a vehicular automatic transmission, comprising: a plurality of friction engagement devices, each of which has two friction members and engages or disengage the two friction members by adjusting an engaging pressure that is generated by supply of an operating oil to the friction engagement device and that engages the two friction members, wherein a downshift is performed by reducing an engaging pressure of a disengage-side one of said friction engagement devices; and a controller which performs a moderate throttle opening degree control of maintaining a degree of throttle opening that is less than a degree of throttle opening that corresponds to an accelerator operation, for a predetermined period following a start of the accelerator operation, and which judges whether the downshift by the friction engagement devices is to be performed, and which determines whether the moderate throttle opening degree control has ended, and which, if it is judged that the downshift is to be performed, restrains a reduction of the engaging pressure of the disengage-side one of the friction engagement devices until it is determined that the moderate throttle opening degree control has ended.