Speed ratio controller for varying a time constant as a function

Details Speed ratio controller for varying a time constant as a function Speed ratio controller for varying a time constant as a function

1998-07-31

2000-01-11

Ta, Khoi Q.

Interrelated power delivery controls, including engine control

Transmission control

Continuously variable friction transmission

477 48, F16H 6100

Patent

active

060130067

ABSTRACT:
A speed ratio controller for a continuously variable transmission of a vehicle is provided which sets a target speed ratio according to a vehicle speed and degree of accelerator pedal depression, sets a command speed ratio according to the target speed ratio and a predetermined dynamic characteristic, and controls the transmission so as to obtain the target speed ratio while a real speed ratio follows the command speed ratio. This speed ratio controller computes a deviation between the command speed ratio and target speed ratio, and determines whether an upshift characteristic is an auto upshift, foot release upshift or foot return upshift based on the speed ratio deviation, degree of accelerator pedal depression, and variation amount of the target input shaft rotation speed. The dynamic characteristic of the command speed ratio is set according to the determination result, and the response characteristics of the transmission are thereby modified.

REFERENCES:
patent: 4947970 (1990-08-01), Miller et al.
patent: 5672137 (1997-09-01), Adachi et al.
patent: 5695428 (1997-12-01), Yuasa et al.
patent: 5782719 (1998-07-01), Adachi
patent: 5820514 (1998-10-01), Adachi
patent: 5857937 (1999-01-01), Ashizawa et al.
Patent Abstracts of Japan, (Adachi, Kazutaka, et al., JP 10-220570, Aug. 21, 1998).
Patent Abstracts of Japan, (Adachi, Kazutaka, JP 09-072408, Mar. 18, 1997).
Gabel, Robert A., et al., Signals and Linear Systems (2.sup.nd edition) 1980, pp. 376 and 386.

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