| 摘要 |
PURPOSE: A method for controlling shift at a low oil temperature is provided to reduce a run-up shock caused by the low oil temperature in up-shift from the second range to the third range in an automatic transmission. CONSTITUTION: A shift control instrument decides output of a power on up-shift control signal from the second range to the third range. After operating a fill time, the shift control instrument a duty control signal by using initial duty value, duty inclination, and duty output time in an up-shift map to a driving instrument. The shift control instrument detects rpm(revolutions per minute) of a turbine. The shift control instrument outputs a duty control signal by establishing the duty inclination for 10% to the driving instrument. In case of the rpm of the turbine over the second-range gear ratio, a run-up is decided for calculating a duty drop amount. A duty compensation is performed by using the duty drop amount and a present duty value. After establishing the duty inclination as 30%, a duty control signal is outputted to the driving instrument. By deciding an up-shift point from the second-range to the third-range, the duty inclination is returned to 10%. The shift control instrument decides completion of shift for outputting the duty control signal to the driving instrument.
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