Electronic control device for an automatic power transmission

Details Electronic control device for an automatic power transmission Electronic control device for an automatic power transmission

1971-12-20

1977-07-12

Scott, Samuel

Machine element or mechanism

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

Preselected indexed position

74752D, B60K 4104

Patent

active

040346277

ABSTRACT:
An electronic control system for a planetary gear set type automatic power transmission comprising a vehicle speed sensor, sensing means to sense a requirement for downshifting from high to low speed ratio, a synchronizing time interval generating circuit responsive to said vehicle speed sensor and said sensing means for generating a signal to cause the transmission to shift in its lowest and overrunning speed ratio for the duration of said signal thereby to provide a synchronizing time interval, the duration of said signal being longer the higher the vehicle speed is to allow the engine speed to be completely synchronized with the transmission speed for effecting smooth downshifting.

REFERENCES:
patent: 3640156 (1972-02-01), Mori et al.
patent: 3721136 (1973-03-01), Irie
patent: 3727488 (1973-04-01), Wakamatsu et al.

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