Control systems for automatic transmissions

Details Control systems for automatic transmissions Control systems for automatic transmissions

1987-03-31

1988-11-29

Wright, Dirk

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

74869, B60K 4118, B60K 4116

Patent

active

047872586

ABSTRACT:
A control system for automatic transmission employed in vehicle comprises a torque converter coupled with an engine, a power transmitting gear arrangement coupled with the torque converter, a speed change device for giving rise to speed change in the power transmitting gear arrangement, a valve arrangement for controlling an operation fluid to be supplied to and drained from the speed change device, a revolving speed sensor for detecting the revolving speed of an input or output portion of the power transmitting gear arrangement when the shifting-down to a low speed with which an engine brake effect is to be obtained from a high speed in the power transmitting gear arrangement is carried out, and a control device for selecting, as the low speed of a target of the shifting-down, a first low speed with which the engine brake effect can be obtained and a second low speed with which the engine brake effect can not be obtained alternatively in response to the revolving speed detected by the revolving speed sensor. The control device selects further the first low speed after the second low speed is selected for a predetermined period of time on the occasion of the shifting-down.

REFERENCES:
patent: 4319501 (1982-03-01), Sugimoto
patent: 4617841 (1986-10-01), Sugano
patent: 4665774 (1987-05-01), Oguri
patent: 4680992 (1987-07-01), Hayasaki et al.

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