Patent ID: 6623403
Filing Date: 2003-09-23
Classification: B60W,F02D,F16H,Y10S,Y10T

Abstract:
A shift control method for an automatic transmission for shifting a gear stage of the automatic transmission based on one of a first shift pattern in which gear stage shifting is based on vehicle speed and an opening degree of a throttle valve and a second shift pattern in which gear stage shifting is based on the vehicle speed and a road condition, with shifting of the gear stage being based on the second shift pattern when the vehicle driving condition is in a deceleration condition, comprising:switching a vehicle shifting condition from the first shift pattern to the second shift pattern when the opening degree of the throttle valve is a first predetermined opening degree or smaller than the first predetermined opening degree; switching the vehicle shifting condition from the second shift pattern to the first shift pattern when the opening degree of the throttle valve is a second predetermined opening degree or larger than the second predetermined opening degree, the second predetermined opening degree being larger than the first predetermined opening degree; and inhibiting the vehicle shifting condition from switching from the second shift pattern to the first shift pattern when an increasing rate of opening degree of the throttle valve is higher than a predetermined increasing rate, even if the opening degree of the throttle valve is the second predetermined opening degree or larger than the second predetermined opening degree.