Method of controlling speed range shifting in an automatic trans

Details Method of controlling speed range shifting in an automatic trans Method of controlling speed range shifting in an automatic trans

1991-03-20

1992-06-30

Lorence, Richard

Machine element or mechanism

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

Preselected indexed position

3644241, F16H 5944

Patent

active

051252945

ABSTRACT:
In a method of controlling speed range shifting, an input-output speed ratio (=output speed/input speed) in a shifting means by which a power transmitting route for the pre-shift speed range is selected is detected when a shift signal to shift from a speed range in which engine brake is available to another speed range in which engine brake is also available is transmitted. An intermediate power transmitting route in which engine brake is not available is selected after the transmission of a shift signal as long as the range of the speed ratio is within a specified range. Then, a power transmitting route for the post-shift speed range is selected based on the shift signal when the change in the speed ratio becomes bigger than the specified range.

REFERENCES:
patent: 4706522 (1987-11-01), Nitz
patent: 4723643 (1988-02-01), Numazawa et al.
patent: 4787258 (1988-11-01), Yamamoto et al.
patent: 4796490 (1989-01-01), Butts et al.
patent: 4889015 (1989-12-01), Kondo
patent: 4955257 (1990-09-01), Terayama et al.
patent: 5020391 (1991-06-01), Aoki et al.
patent: 5069085 (1991-12-01), Iizuka
patent: 5075858 (1991-12-01), Narita
Patent Abstracts of JP A-61-109944, A-62-233551 and A-60-30852.
English Summary of Japanese Publication Nos. 61-189354, 61-109941 61-109942 and 61-109943.

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