| 摘要 |
PURPOSE: A 2-range selection control method in shifting from 3-range to L-range is provided to prevent shift shock by controlling shifting according to RPM(Revolution Per Minute) of a turbine and vehicle speed. CONSTITUTION: A transmission control unit detects RPM of a turbine at the input part of a transmission and vehicle speed such as RPM of the output part in selecting 2-range during shifting from 3-range to L-range(S110-S120). A shift signal is output to downshift from 3-range to 2-range in case of the calculated value to be similar to the 3-range in dividing the RPM of the turbine by the vehicle speed(S130-S140). The RPM of the turbine is decided to be similar to the 1-range with passing the 2-range in case of the calculated value to be between the 2-range and the 1-range in dividing the turbine RPM by the vehicle speed, and a shifting signal is output to upshift from the 1-range to the 2-range(S150-S160). Shifting to the 2-range is decided, and the duty control is finished in case of the value to approach the 2-range synchronous point(S170-S180). Shift shock is prevented with controlling shifting according to the turbine RPM and the vehicle speed.
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