Control device of a transmission fluid pressure by temporary reduction in negative feedback control of speed for an electronically controlled automatic transmission

Abstract

A control device of a transmission fluid pressure for an electronically controlled automatic transmission comprising: a rotational number change detecting means for detecting a rotational number change of either an engine or a rotational member of an automatic transmission; a transmission fluid pressure controlling means for arbitrarily controlling a transmission fluid pressure for a transmission fluid pressure controlling device of the automatic transmission; and a control device for controlling a target value of the transmission fluid pressure for the transmission fluid pressure controlling device by a negative feed back control dependent at least on the rotational number change of either the engine or the rotational member of the automatic transmission, said control device determining whether the engine is in a constant speed or acceleration mode, and temporarily discontinuing the negative feed back control or reducing a control quantity thereof when the engine shifts from a deceleration/closed throttle mode to a constant speed or acceleration mode while the transmission fluid pressure controlling means is controlling the transmission fluid pressure for changing the gear in which the transmission to which the engine is coupled.

Dependencies are inferred from the claim text.