Method of controlling shifts in an automatic transmission

Details Method of controlling shifts in an automatic transmission Method of controlling shifts in an automatic transmission

F - Mech Eng,Light,Heat,Weapons

16

H

74/159, 341/68

F16H 59/04 (2006.01) F16H 59/68 (2006.01) F16H 61/04 (2006.01) F16H 61/16 (2006.01)

Patent

CA 1314734

ABSTRACT OF THE DISCLOSURE An automatic transmission shift controlling method for preventing both excessive delays in speed ratio shifts and multiple shifts in close succession in response to two different shift commands in a short time period. When a first shift command is issued, the input and output rotational speed ratio of a shift means associated with a first target speed range for selecting a power transmission path associated with the first target speed range and determined by the first shift command is detected, and the start of operation of the shift means associated with the first target speed range is detected by checking whether the input and output rotational speed ratio has started to vary or not. When a second gear-shift command is issued after the first shift command has been issued but before the start of operation of the shift means is detected, the second shift command is accepted.

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