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Torque converter hydraulic control system for an automatic transmission

  • US 9,341,199 B2
  • Filed: 08/07/2013
  • Issued: 05/17/2016
  • Est. Priority Date: 08/14/2012
  • Status: Active Grant
First Claim
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1. A system for a motor vehicle comprising:

  • a source of pressurized hydraulic fluid;

    a torque converter actuator operable to engage a torque converter lock-up clutch, the torque converter actuator having a release side port and an apply side port;

    a cooler subsystem;

    a control valve assembly having a first port in communication with the source of pressurized hydraulic fluid, a second port in communication with the apply side port, a third port in communication with the cooler subsystem, a fourth port, a fifth port in communication with the source of pressurized hydraulic fluid, a sixth port in communication with the release side port, and a spool moveable between at least a first position and a second position, wherein the first and fourth ports are isolated, the second port communicates with the third port, and the fifth port communicates with the sixth port when the spool is in the first position, and wherein the first port communicates with the second port, the fourth port communicates with the third port, and the fifth port is isolated when the spool is in the second position; and

    a boost valve assembly disposed directly between the fourth port and the source of pressurized hydraulic fluid, wherein the boost valve assembly communicates hydraulic fluid to the fourth port when the pressurized hydraulic fluid exceeds a threshold pressure,wherein the boost valve assembly includes a first inlet in communication with the source of pressurized hydraulic fluid, a second inlet in communication with the source of pressurized hydraulic fluid through a first orifice, an outlet in direct communication with the fourth port, and a boost spool moveable between at least first and second positions wherein the boost spool prevents fluid communication between the first inlet and the outlet when in the first position and the boost spool allows fluid communication between the first inlet and the outlet when in the second position,wherein the boost spool includes a first end, a second end in communication with the second inlet, and a biasing member in contact with the first end, wherein the boost spool is moved to the second position when a force acting on the second end by the pressurized hydraulic fluid exceeds a force acting on the first end by the biasing member,further comprising a second orifice disposed directly between the outlet of the boost valve assembly and the fourth port of the control valve assembly,wherein the outlet communicates directly with the source of pressurized hydraulic fluid through a third orifice.

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