Upshift scheduling valve for use in hydraulic transmission contr

Details Upshift scheduling valve for use in hydraulic transmission contr Upshift scheduling valve for use in hydraulic transmission contr

1979-04-24

1982-01-12

Braun, Leslie

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4106, B60K 4110

Patent

active

043099190

ABSTRACT:
In a hydraulic control system for an automatic power transmission, there is provided an upshift scheduling valve by means of which the release of a frictional unit contributive to the second forward drive gear ratio is retarded in relation to the rate at which a frictional unit contributive to the third forward drive gear ratio and further with the load on the engine so that the two frictional units are permitted to be concurrently operative for an adequate period of time preventing the engine from racing during shifting from the second gear ratio to the third gear ratio in the automatic forward drive range.

REFERENCES:
patent: 3150567 (1964-09-01), Duffy
patent: 3237476 (1966-03-01), Jandasek
patent: 3495481 (1970-02-01), Ohie et al.
patent: 3546973 (1970-12-01), Ohie et al.
patent: 3667323 (1972-06-01), Irie
patent: 3685372 (1972-08-01), Miyazaki
patent: 3890856 (1975-06-01), Miyauchi et al.
patent: 3978743 (1976-09-01), Murakami
patent: 4136584 (1979-01-01), Ishikawa

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