Patent ID: 7563189
Filing Date: 2009-07-21
Classification: F16H,Y10T

Abstract:
1. A control apparatus of an automatic transmission comprising: a first frictional element that is engaged at a first speed stage and is released at a second speed stage achieved by a primary shift and further is engaged at a third speed stage achieved by a secondary shift; a second frictional element that is released at the first speed stage and is engaged at the second speed stage and further is engaged at the third speed stage; a third frictional element that is engaged at the first speed stage and is engaged at the second speed stage and further is released at the third speed stage; a first shift control section that issues a command of hydraulic pressure for the first frictional element to be released, and issues a command of hydraulic pressure for the second frictional element to be engaged, at the time of the primary shift; a second shift control section that issues a command of hydraulic pressure for the first frictional element to be engaged, and issues a command of hydraulic pressure for the third frictional element to be released, at the time of the secondary shift; a judging section that judges a shift from the first speed stage to the third speed stage based on an operation condition of a vehicle; and a third shift control section that initiates the primary shift when the shift is judged by the judging section, and initiates the secondary shift while carrying out the primary shift when a gear ratio reaches a first predetermined gear ratio set before a gear ratio where an inertia phase of the primary shift is ended, or when a parameter reaches a parameter corresponding to the first predetermined gear ratio, and the third shift control section comparing two pressure command values for the first frictional element, respectively issued by the first and second shift control sections, and selecting a greater pressure command value, and outputting the greater pressure command value to the first frictional element, upon the initiation of the secondary shift.