Logic valving for a transmission control

Patent · Tue May 09 00:00:00 EDT 1989

OSTI ID:5836229

Long, C F; McCauley, P F; Boyer, R C

This patent describes a transmission control system comprising: solenoid control means selectively actuatable for establishing a control pressure signal in the logic valve means for signaling the selection of a forward drive request; a pair of spool valve means each having a signal chamber which is pressurized in response to actuation of the solenoid control means for urging the spool valve means in one of two directions, spring means for urging the respective spool valve means in the other direction, and latching chamber means for urging respective spool valve means in one direction, the latching chamber means of each spool valve means being in fluid communication with the source through respective ones of the normally open solenoid valves when the solenoid control means is actuated and the respective normally open solenoid valve is unactuated for maintaining the respective spool valve urged against the respective spring means when all the solenoid operated shift valve means become unactuated and the source continues to supply fluid to force the transmission to the second highest speed ratio from the highest speed ratio, to the third highest speed ratio from any of the two speed ratios immediately below or the second highest speed ratio immediately above the third highest speed ratio when all of the solenoid valves become unactuated and the source is continuing to supply fluid.

• Assignee: General Motors Corp., Detroit, MI
• Patent Number(s): US 4827806
• OSTI ID: 5836229
• Resource Relation: Patent File Date: Filed date 11 Aug 1988
• Country of Publication: United States
• Language: English

Related Subjects

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INTERNAL COMBUSTION ENGINES
SOLENOIDS
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VELOCITY
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