Shift inhibit valve for a transmission control

Details Shift inhibit valve for a transmission control Shift inhibit valve for a transmission control

1988-08-11

1989-08-22

Diehl, Dwight G.

Machine element or mechanism

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

Preselected indexed position

74867, B60K 4106

Patent

active

048585017

ABSTRACT:
A transmission is operable to establish a plurality of forward speed ratios for a vehicle. The interchange of ratios is controlled by an electro-hydraulic valve arrangement and an inhibiting valve. If electrical power is discontinued and the transmission is operating in the highest speed ratio, the inhibit valve will maintain the highest speed ratio. At lower speed ratios the control will shift the transmission to the third highest speed ratio. During normal operation, the forced downshift from the highest ratio to the third highest ratio is delayed by the inhibit valve until the second highest ratio has been engaged. This prevents engine overspeed which might otherwise occur.

REFERENCES:
patent: 3927579 (1975-12-01), Golan
patent: 4688449 (1987-08-01), Harada et al.
patent: 4718311 (1988-01-01), Hayakawa et al.
patent: 4719822 (1988-01-01), Morisawa
patent: 4721018 (1988-01-01), Harada et al.
patent: 4726262 (1988-02-01), Hayakawa et al.

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