Shift scheduling in automatic transmission with throttle modifie

Details Shift scheduling in automatic transmission with throttle modifie Shift scheduling in automatic transmission with throttle modifie

1988-10-31

1990-11-06

Wright, Dirk

Machine element or mechanism

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

Preselected indexed position

74870, B60K 4116

Patent

active

049676113

ABSTRACT:
A hydraulic system for an automatic transmission comprises a governor valve generating a governor pressure, a throttle valve generating a throttle pressure, a throttle modifier valve generating a throttle modifier pressure which is an amplified pressure of the throttle pressure and thus higher than said throttle pressure, a throttle opening detecting valve generating a partial throttle pressure, and a shift valve. The shift valve has a spool subject to the governor pressure to be biased toward an up position thereof. The spool has a pressure acting area which is exposed to the throttle modifier pressure when the spool is in a down position thereof. This pressure acting area is exposed the partial throttle pressure when the spool is in the up position thereof.

REFERENCES:
patent: 3580112 (1971-05-01), Dach
patent: 3890856 (1975-06-01), Miyauchi et al.
patent: 4106369 (1978-08-01), Taga
patent: 4282781 (1981-08-01), Iwanaga et al.
patent: 4296651 (1981-10-01), Iwanaga et al.
patent: 4313354 (1982-02-01), Iwanaga et al.
patent: 4334442 (1982-06-01), Iwanaga et al.
patent: 4347764 (1982-09-01), Lauven
patent: 4432255 (1984-02-01), Borman et al.
patent: 4537095 (1985-08-01), Morisawa
patent: 4680989 (1987-07-01), Sykora et al.

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