Patent ID: 6915681
Filing Date: 2005-07-12
Classification: F16H

Abstract:
1. A control device for an automatic transmission installed in a vehicle, comprising: a detecting portion that detects a timing when an engine of the vehicle is to be started; an oil temperature detecting portion that detects a temperature of hydraulic fluid contained in the automatic transmission; a storing portion that stores a relationship between the temperature of the hydraulic fluid at engine start and an oil temperature threshold; a calculating portion that calculates the oil temperature threshold corresponding to the hydraulic fluid temperature detected by the oil temperature detecting portion at the timing detected by the detecting portion on the basis of the relationship stored in the storing portion; and a control portion that controls the automatic transmission to prohibit a gear shift to a specific gear stage if the hydraulic fluid temperature detected by the oil temperature detecting portion is equal to or lower than the oil temperature threshold calculated by the calculating portion while the vehicle is running.