Ratio shift control system for an automatic transmission

Abstract

A ratio shift control system for an automatic transmission calculates the magnitude of a difference in temperature between a detected engine coolant temperature and a detected outside air temperature, which are detected by coolant and outside air temperature sensors, respectively, during one engine start of an internal combustion engine. Ratio shift in the automatic transmission is controlled based on the detected outside air temperature during the one engine start when the magnitude of the difference in temperature is equal to or less than a predetermined cold engine evaluation threshold.

Description

technical field [0001] The present invention relates to a shift control system for an automatic transmission, and more particularly, to a shift control system for controlling an automatic shift by obtaining an appropriate outside air temperature. Background technique [0002] Motor vehicles have been driven efficiently by on-board automatic transmissions, which transmit the shaft torque of the internal combustion engine (or "engine") to its output side, pushing the traction wheels, while regulating the number of revolutions to the appropriate . In order to provide efficient power transmission, it is necessary to adjust the control conditions according to the outside air temperature and the like, so this type of automatic transmission uses the detected temperature from the outside air temperature sensor. [0003] It is known practice to arrange such an outside air temperature sensor in the engine compartment. Thus, the outside air temperature sensor is affected by the radia...

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Problems solved by technology

This makes it difficult to expect effective high-quality drive control

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