Operating range selection of an automatic transmission

Interrelated power delivery controls – including engine control – Transmission control – Transmission controlled by engine

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Details

477134, 477138, F16H 6126

Patent

active

057625808

ABSTRACT:
A rotary switch, used to select the operating range of an automatic transmission, controls solenoid-operated valves corresponding to the selected range to open and close a connection between a range valve assembly and a control pressure source. A forward range selection electric circuit includes a forward range high side driver, a solenoid-operated control valve, the rotary switch, a power source, and a current monitor. There is a similar circuit for the reverse range. A forward range valve and reverse range valve respond to control pressure produced by the circuit to open a fluid pressure source to a line that is pressurized to produce forward drive, a second position opens a connection between the fluid pressure source and a line that is pressurized to produce reverse drive and vents those lines to sump.

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U.S. application Ser. No. 08/254,833, filed Jun. 6, 1994, "Operating Range Selection of an Automatic Transmission".
U.S. application Ser. No. 08/254,832, filed Jun. 6, 1994, "Operating Range Selection of an Automatic Transmission".

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