Double transition upshift control for an automatic transmission

Details Double transition upshift control for an automatic transmission Double transition upshift control for an automatic transmission

1991-02-07

1991-09-24

Herrmann, Allan D.

Machine element or mechanism

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

Preselected indexed position

74867, 74868, B60K 4118

Patent

active

050504584

ABSTRACT:
An improved control method for properly coordinating a double transition upshift. The state changes of the various clutches of the transmission are sequenced in relation to a dynamic measure of the transmission speed ratio so as to provide consistent high quality shifting. Closed-loop pressure controls are employed in conjunction with the sequencing to ensure timely shift completion.

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patent: 4690017 (1987-09-01), Taniguchi et al.
patent: 4700591 (1987-10-01), Yasue et al.
patent: 4718310 (1988-01-01), Shind et al.
patent: 4722247 (1988-02-01), Shindo et al.
patent: 4798105 (1989-01-01), Takase et al.
patent: 4856380 (1989-08-01), Murano et al.
patent: 4898049 (1990-02-01), Niikura
patent: 4958492 (1990-09-01), Maki et al.
patent: 4967355 (1990-10-01), Iwatsuki et al.

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