Speed-changing hydraulic oil pressure control apparatus for an automatic transmission of an automobile
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United States of America Patent
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-
Mar 8, 1994
Grant Date -
N/A
app pub date -
Nov 22, 1991
filing date -
Apr 6, 1990
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A speed-changing hydraulic oil pressure control apparatus for controlling speed-changing hydraulic oil pressure according to a transition state of the speed change in an automatic transmission. The controllability is improved by detecting in advance the transfer from a torque phase to an inertia phase by detecting the output torque of the transmission and the input revolution number and output revolution number of a torque converter. The input torque of the transmission is estimated from the input revolution number and output revolution number of the torque converter, and the transition state of the speed change is detected from the input torque and output torque of the transmission. By comparing input torque and output torque of the transmission, the transfer from the torque phase to the inertia passe is detected in advance by utilizing the phenomenon of a large fall of the output torque of the transmission just before the transfer to the inertia phase from the torque phase.
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