Continuously variable transmission control apparatus

Details Continuously variable transmission control apparatus Continuously variable transmission control apparatus

1997-01-13

1999-02-16

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 37, 477 46, F16H 5936

Patent

active

058714170

ABSTRACT:
A shift control apparatus for use with a continuously variable transmission operable at a speed ratio changed in a plurality of steps for transmitting a drive from the engine to the vehicle wheels. The shift control apparatus is operable in the manual shift control mode for producing an upshift command in response to a driver's upshift demand and a downshift command in response to a driver's downshift demand. An upshift is produced from a current speed ratio to another speed ratio one step higher than the current speed ratio in response to the upshift command and a downshift from the current speed ratio to another speed ratio one step lower than the current speed ratio in response to the downshift command. The transmission speed ratio is corrected to keep the engine speed at or below a predetermined acceptable value. An upper vehicle speed limit value is set for each of the speed ratios to provide a greater first upper vehicle speed limit value for a higher speed ratio. The shift control apparatus is arranged to produce an upshift from the current speed ratio to another speed ratio one step higher than the current speed ratio when the engine speed is at the acceptable value and the vehicle speed exceeds the upper vehicle speed limit value.

REFERENCES:
patent: 4836056 (1989-06-01), Nakawaki et al.
patent: 5609544 (1997-03-01), Lardy et al.
patent: 5655991 (1997-08-01), Lardy et al.

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