Control apparatus for hydraulically operated vehicular transmiss

Details Control apparatus for hydraulically operated vehicular transmiss Control apparatus for hydraulically operated vehicular transmiss

1997-09-23

1999-11-16

Marmor, Charles A.

Interrelated power delivery controls, including engine control

Transmission control

Transmission controlled by engine

477154, F16H 6106

Patent

active

059848340

ABSTRACT:
Even if a rotational speed of an engine has already increased due to slipping of a fluid torque converter at the time of start of downshifting, a smooth downshifting is performed. For that purpose, there is obtained a speed change developing degree function K(etrm) of the rotational speed of the engine at the time of start of downshifting, the developing degree being dependent on an increase in the rotational speed of the engine due to slipping in the fluid torque converter. The function K(etrm) is obtained with a speed ratio "etrm" of the fluid torque converter at the time of starting of downshifting as a parameter. A boosting correction value QDNOFFZ is computed by multiplying a reference correction value QDNOFFZO by K(etrm) (step S108-5). The hydraulic pressure of the hydraulic engaging element on the disengaging side during downshifting is boosted by the amount of QDNOFFZ (step S108-6).

REFERENCES:
patent: 4653351 (1987-03-01), Downs et al.
patent: 4793216 (1988-12-01), Hiramatsu et al.
patent: 4984483 (1991-01-01), Hiramatsu et al.
patent: 5012699 (1991-05-01), Aoki et al.
patent: 5070747 (1991-12-01), Lentz et al.
patent: 5401219 (1995-03-01), Kimura et al.
patent: 5443427 (1995-08-01), Ataka et al.
patent: 5795265 (1998-08-01), Domain et al.

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