Multi-pressure hydraulic control system for a dual clutch automatic transmission

Patent metadata

Field	Value
Publication number	US-2018100577-A1
Application number	US-201615566816-A
Country	US
Kind code	A1
Filing date	Apr 11, 2016
Priority date	Apr 17, 2015
Publication date	Apr 12, 2018
Grant date	—

Abstract

A multi-pressure hydraulic control system ( 66, 166 ) for use with a dual clutch automatic transmission ( 14 ) of a vehicle powertrain system ( 10 ) includes a least one pump ( 28 ) including a rotatable pump member ( 34 ), at least one inlet region ( 40 ) for receiving fluid to be pumped by the pump member ( 34 ), and at least one outlet region ( 42 ) for outputting fluid pumped by the pump member ( 34 ), and a switching valve ( 78, 178 ) receiving at least two separate outputs of fluid pumped by the at least one pump ( 28 ) for allowing the at least two separate outputs to be selectively combined and/or separated, the switching valve ( 78, 178 ) having a valve member being movable between at least three positions that produces fluid outputs having at least three fluid pressures of a high fluid pressure, a medium fluid pressure, and a low fluid pressure to one or more portions of the dual clutch automatic transmission ( 14 ).

First claim

1 . A multi-pressure hydraulic control system ( 66 , 166 ) for use with a dual clutch automatic transmission ( 14 ) of a vehicle powertrain system ( 10 ), said hydraulic control system ( 66 , 166 ) comprising:
at least one pump ( 28 ) including a rotatable pump member ( 34 ), at least one inlet region ( 40 ) for receiving fluid to be pumped by said pump member ( 34 ), and at least one outlet region ( 42 ) for outputting fluid pumped by said pump member ( 34 ); a switching valve ( 78 , 178 ) receiving at least two separate outputs of fluid pumped by said at least one pump ( 28 ) for allowing the at least two separate outputs to be selectively combined and/or separated, said switching valve ( 78 , 178 ) having a valve member ( 79 , 179 ) being movable between at least three positions that produces fluid outputs having at least three fluid pressures of a high fluid pressure, a medium fluid pressure, and a low fluid pressure to one or more portions of the dual clutch automatic transmission ( 14 ).

2 . A multi-pressure hydraulic control system ( 66 ) as set forth in claim 1 including a pressure regulator ( 88 ) fluidly communicating with at least one of said at least two separate outputs of fluid pumped by said at least one pump ( 28 ) and with at least two of the fluid outputs of said switching valve ( 78 , 178 ) having the at least two of the high fluid pressure, the medium fluid pressure, and the low fluid pressure to regulate the pressure of the fluid to the one or more portions of the dual clutch automatic transmission ( 14 ).

3 . A multi-pressure hydraulic control system ( 166 ) as set forth in claim 1 including a fluid accumulator ( 198 ) fluidly communicating with at least one of the three fluid outputs of said switching valve ( 78 , 178 ) and with one or more portions of the dual clutch automatic transmission ( 14 ).

4 . A multi-pressure hydraulic control system ( 66 , 166 ) as set forth in claim 1 wherein one of said at least three fluid outputs having the high fluid pressure fluidly communicates with at least one of a gear shift portion ( 70 ) and clutch portion ( 68 ) of the dual clutch automatic transmission ( 14 ).

5 . A multi-pressure hydraulic control system ( 66 , 166 ) as set forth in claim 1 wherein one of said at least three fluid outputs having the medium fluid pressure fluidly communicates with a gearbox portion ( 74 ) of the dual clutch automatic transmission ( 14 ).

6 . A multi-pressure hydraulic control system ( 66 , 166 ) as set forth in claim 1 wherein one of said at least three fluid outputs having the low fluid pressure fluidly communicates with at least one of a clutch cooling portion ( 72 ) of the dual clutch automatic transmission ( 14 ).

7 . A multi-pressure hydraulic control system ( 66 ) as set forth in claim 2 wherein said pressure regulator ( 88 ) is fluidly connected to one of said at least two separate outputs of fluid pumped by said at least one pump ( 28 ) and one of said at least three fluid outputs having the high fluid pressure, the medium fluid pressure, and the low fluid pressure.

8 . A multi-pressure hydraulic control system ( 166 ) as set forth in claim 3 wherein said fluid accumulator ( 198 ) is fluidly connected to one of said at least three fluid outputs having the high fluid pressure.

9 . A multi-pressure hydraulic control system ( 66 , 166 ) as set forth in claim 1 wherein said at least one pump ( 28 ) comprises a stator ( 30 ) having a chamber and said pump member ( 34 ) being disposed in said chamber and cooperating with said stator ( 30 ) so as to define at least three pumping regions in said chamber with each of said at least three pumping regions having said at least one inlet region ( 40 ) and said at least one outlet region ( 42 ), wherein rotation of said pump member ( 34 ) displaces fluid across each of said at least three pumping regions such that each said at least one outlet region ( 42 ) provides a separate source of fluid power to said switching valve ( 78 , 178 ).

10 . A method for controlling a multi-pressure hydraulic control system ( 66 , 166 ) for use with a dual clutch automatic transmission ( 14 ) of a vehicle powertrain system ( 10 ), said method comprising the steps of:
pumping fluid by at least one pump ( 28 ) including a rotatable pump member ( 34 ), at least one inlet region ( 40 ) for receiving fluid to be pumped by the pump member ( 34 ), and at least one outlet region ( 42 ) for outputting fluid pumped by the pump member ( 34 ); and receiving at a switching valve ( 78 , 178 ) at least two separate outputs of fluid pumped by the at least one pump ( 28 ), the switching valve ( 78 , 178 ) having a valve member ( 79 , 179 ) being movable between at least three positions, and moving the valve member ( 79 , 179 ) between the at least three positions to produce fluid outputs having a high fluid pressure, a medium fluid pressure, and a low fluid pressure to one or more portions of the dual clutch automatic transmission ( 14 ).

11 . A method as set forth in claim 10 including the step of providing a pressure regulator ( 88 ) and fluidly communicating the pressure regulator ( 88 ) with at least one of the at least two separate outputs of fluid pumped by the at least one pump ( 28 ) and with at least two of the at least three fluid outputs of the switching valve ( 78 ) to regulate the pressure of the fluid to the one or more portions of the dual clutch automatic transmission ( 14 ).

12 . A method as set forth in claim 10 including the step of providing a fluid accumulator ( 198 ) and fluidly communicating the fluid accumulator ( 198 ) with at least one of the three fluid outputs of fluid pumped by the at least one pump ( 28 ) and with one or more portions of the dual clutch automatic transmission ( 14 ).

13 . A method as set forth in claim 10 including the step of fluidly communicating one of the at least three fluid outputs having the high fluid pressure with at least one of a gear shift portion ( 70 ) and a clutch portion ( 68 ) of the dual clutch automatic transmission ( 14 ).

14 . A method as set forth in claim 10 including the step of fluidly communicating one of the at least three fluid outputs having the medium fluid pressure with a gearbox portion ( 74 ) of the dual clutch automatic transmission ( 14 ).

15 . A method as set forth in claim 10 including the step of fluidly communicating one of the at least three fluid outputs having the low fluid pressure with a clutch cooling portion ( 72 ) of the dual clutch automatic transmission ( 14 ).

16 . A method as set forth in claim 11 including the step of fluidly connecting the pressure regulator ( 88 ) to one of the at least two separate outputs of fluid pumped by the at least one pump ( 28 ) and one of the at least three fluid outputs having the high fluid pressure, the medium fluid pressure, and the low fluid pressure.

17 . A method as set forth in claim 12 including the step of fluidly connecting the fluid accumulator ( 198 ) to one of the at least three fluid outputs having the high fluid pressure.

18 . A method as set forth in claim 10 including the step of providing the at least one pump ( 28 ) with a stator ( 30 ) having a chamber and the pump member ( 34 ) being disposed in the chamber and cooperating with the stator ( 30 ) so as to define at least three pumping regions in the chamber with each of the at least three pumping regions having the at least one inlet region ( 40 ) and the at least one outlet region ( 42 ), wherein rotation of the pump member ( 34 ) displaces fluid across each of the at le

Assignees

• Borgwarner Inc

Inventors

• Guo Chengyun
• Spangler Christopher A
• Semenov Dmitriy

Classifications

• F16D48/0206

  in a system with a plurality of fluid-actuated clutches · CPC title

• F16D2300/0214

  Oil or fluid cooling · CPC title

• F16D2300/06

  Lubrication details not provided for in group F16D13/74 · CPC title

• F16D2048/0233

  by rotary pump actuation · CPC title

• F16D25/10

  Clutch systems with a plurality of fluid-actuated clutches (arrangements or mounting of clutches in vehicles B60K17/00) · CPC title