Control method for an automatic transmission
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United States of America Patent
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Oct 31, 2006
Issued Date -
N/A
app pub date -
Apr 8, 2003
filing date -
Apr 10, 2002
priority date (Note) -
In Force
status (Latency Note)
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Abstract
Control method for effecting a gear shift in a stepped automatic transmission with an input shaft and an output shaft for transmitting power between two inertia components at distinct speed ratios with a first power transmission path and a second power transmission path being provided with a high clutch having an adjustable torque transmitting capacity T.sub.H and a low clutch having an adjustable torque transmitting capacity T.sub.L respectively. The method includes the steps of determining a gear set input torque Tin to be transmitted by the transmission in the direction from the input shaft to the output shaft and controlling the torque transmitting capacities T.sub.H and T.sub.L in dependency on the gear set input torque T.sub.in to be transmitted such that: a) if T.sub.in>=0 then T.sub.H=T.sub.in and T.sub.L=0 b) if T.sub.in<0 then T.sub.H=0 and T.sub.L=T.sub.i.
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