Hydraulic system for controlling shift in automatic transmission

Details Hydraulic system for controlling shift in automatic transmission Hydraulic system for controlling shift in automatic transmission

1988-10-31

1990-08-21

Diehl, Dwight

Machine element or mechanism

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

Preselected indexed position

B60K 4110

Patent

active

049495976

ABSTRACT:
A single sequence valve is connected to a 3-4 shift valve thereby defining a drain circuit. The sequence valve is responsive to hydraulic pressures which act on a fourth speed apply chamber of a band brake and a high clutch, respectively. The sequence valve normally defines the drain circuit, but delivers hydraulic fluid to the 3-4 shift valve, then to the fourth speed apply chamber of the band brake after a command for a 4-2 downshift has taken place until the hydraulic pressure in the high clutch drops to a predetermined value.

REFERENCES:
patent: 4050332 (1977-09-01), Taga
patent: 4555964 (1985-12-01), Sugano
patent: 4637281 (1987-01-01), Vanselous
patent: 4727774 (1988-03-01), Sumiya et al.
patent: 4730521 (1988-03-01), Hayasaki et al.
patent: 4787258 (1988-11-01), Yamamoto et al.

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