Machine element or mechanism – Rotary member or shaft indexing – e.g. – tool or work turret – Preselected indexed position
Patent
1990-08-20
1991-11-12
Herrmann, Allan D.
Machine element or mechanism
Rotary member or shaft indexing, e.g., tool or work turret
Preselected indexed position
3644241, B60K 4108
Patent
active
050638149
ABSTRACT:
A line pressure control system for an automatic transmission, including a multiple shift stage transmission gear mechanism having a plurality of power transmitting paths of different speed ratios, has a line pressure control device for controlling a line pressure for frictional elements of the transmission gear mechanism associated with each other to establish a desirable shift gear stage. A shift period detector detects a time period for a shift operation, accomplished in terms of operation of the frictional elements controlled by the line pressure. A first compensating device controls the line pressure in terms of a learing control in a manner such that the time period for the shift operation is controlled to a target value. An abnormality detecting device detects an abrupt change, such as a turbine speed rise or, depression, or a driving torque depression in an operating condition of the transmission. A second compensating device compensates the line pressure prior to compensation of the line pressure by the first compensating device when the abrupt change is detected. The torque shock can be effectively obviated during a shift operation.
REFERENCES:
patent: 3750495 (1973-08-01), Ito et al.
patent: 4868753 (1989-09-01), Mori
patent: 4870581 (1989-09-01), Ito et al.
patent: 4953090 (1990-08-01), Narita
Baba Fumiaki
Fujiwara Takuji
Ishii Kozo
Yoshimura Hiroshi
Herrmann Allan D.
Mazda Motor Corporation
Trousdell William O.
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