Method and apparatus for controlling continuously variable trans

Details Method and apparatus for controlling continuously variable trans Method and apparatus for controlling continuously variable trans

1984-08-29

1987-03-24

Lall, Parshotam S.

Boots, shoes, and leggings

74866, 474 18, B60K 4112

Patent

active

046530053

ABSTRACT:
Method and apparatus for controlling a continuously variable transmission operatively connecting an engine and drive wheels of a vehicle, wherein a speed ratio of the transmission is controlled such that an actual engine speed coincides with a target engine speed. The method and apparatus comprise steps or devices for: determining a normal target speed and a variation-restraint trigger speed based at least on a currently required output of the engine, the normal target speed being higher than the trigger speed and normally used as the target engine speed; restraining a rate of variation in the speed ratio while the actual engine speed is raised from the trigger speed to the normal target speed during acceleration of the vehicle; and selecting the trigger speed as a special target speed when the actual engine speed has been raised to the normal target speed. After the special target speed has been selected, the transmission is controlled such that the engine speed is lowered to the special target speed, i.e., to the variation-restraint trigger speed.

REFERENCES:
patent: 4458560 (1984-07-01), Frank et al.
patent: 4507986 (1985-04-01), Okamura et al.
patent: 4509125 (1985-04-01), Fattic et al.
patent: 4515040 (1985-05-01), Takeuchi et al.
patent: 4516652 (1985-05-01), Tanigawa et al.
patent: 4543855 (1985-10-01), Oetting et al.
patent: 4546673 (1985-10-01), Shigematsu et al.

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