Tsunlock A Yu

8235198, Aug 7, 2012

Nov 20, 2009

12/622529

Larry A. Pritchard - Macomb MI, US
Philip J. Francis - Lapeer MI, US
Thad Kopp - Oakland Township MI, US
Tsunlock A. Yu - Saline MI, US

Borgwarner, Inc. - Auburn Hills MI

F16D 25/08
F16D 13/74

192 8555, 19211334

A hydraulic clutch assembly for a motor vehicle driveline is provided. The clutch assembly comprises an input member, and output member and a friction clutch pack operably disposed therebetween for controlling torque transfer. A first fluid circuit contains hydraulic based fluid at a first pressure and is in fluid communication with the friction clutch pack for lubrication thereof. A second fluid circuit is in fluid communication with the first fluid circuit for replenishing the second fluid circuit with the hydraulic based fluid at a second pressure that is less than the first pressure. The clutch assembly further comprises a motor and a gear train. A first piston is in fluid communication with the second fluid circuit for delivering the hydraulic based fluid thereto A second piston is translated by the hydraulic based fluid displaced by the first piston to actuate the friction clutch pack.

20070137966, Jun 21, 2007

Dec 19, 2006

11/641132

Philip Francis - Lapeer MI, US
Christopher Kowalsky - Windsor, CA
Mark Perlick - Shelby Township MI, US
Tsunlock Yu - Saline MI, US
Larry Pritchard - Macomb MI, US

F16D 29/00

192020000, 192084600, 1920850CA

An electrohydraulic clutch includes a bidirectional electric motor, a hydraulic circuit and a multiple plate friction clutch pack. The bidirectional electric motor drives a ball screw through a gear reduction assembly. An electric brake on the motor output may be energized to inhibit its rotation. Alternatively, an anti-back drive wrap-spring assembly may be utilized on the motor output. The ball screw output bi-directionally translates a master piston of the hydraulic circuit which in turn advances and retracts an annular slave piston disposed adjacent the friction clutch pack. Hence, actuation of the electric motor displaces hydraulic fluid and compresses or relaxes the friction clutch pack, thereby transferring or inhibiting torque.

50386360, Aug 13, 1991

Feb 7, 1991

7/651870

William J. Vukovich - Ypsilanti MI
Melissa M. Koenig - Ann Arbor MI
Tsunlock A. Yu - Ypsilanti MI

General Motors Corporation - Detroit MI

B60K 4118

74866

An improved control method for properly coordinating a double transition downshift. The state changes of the various clutches of the transmission are sequenced in relation to a dynamic measure of the transmission speed ratio so as to provide consistent high quality shifting. Adaptive pressure controls are employed in conjunction with the sequencing to compensate for variability.

60446455, Apr 4, 2000

Aug 7, 1998

9/130074

Edward J. Greenan - Belleville MI
Bruce T. Levy - Howell MI
Tsunlock Andrew Yu - Saline MI
Alan Lee Brace - Livonia MI

General Motors Corporation - Detroit MI

F16D 3300

60337

A power transmission has a hydraulic control from which oil is distributed to various transmission components, a cooler and reservoir. A flow direction control valve is disposed in the distribution system to direct oil in transit to the reservoir during cold operation and to a transmission lubrication circuit or cooling circuit during normal operating temperatures.

53077270, May 3, 1994

May 19, 1992

7/885933

Todd R. Berger - Plymouth MI
Tsunlock A. Yu - Saline MI
Scott B. Pollack - Livonia MI

General Motors Corporation - Detroit MI

F15B 1304
F16D 3102

91 29

In a neutral to drive shift timing control mechanism, a flow control arrangement is utilized in an electro-hydraulic control system for controlling a clutch fill period of a neutral to drive shift sequence. The hydraulic control system provides a pressure pulse of predetermined time which opens a valve to permit fluid flow to bypass an accumulator feed orifice to pressurize the clutch apply cylinder and piston to a value substantially equal to the piston return spring force without providing excess flow to the accumulator. The clutch apply pressure is then permitted to increase at a more normal rate which is controlled by the accumulator. The engagement time is determined so that the pulse time can be adjusted if the neutral to drive shift is not within a predetermined time range.

49986040, Mar 12, 1991

Feb 12, 1990

7/478860

William J. Vukovich - Ypsilanti MI
Tsunlock A. Yu - Ypsilanti MI

General Motors Corporation - Detroit MI

F16H 4502
F16H 6114

192 33

The torque capacity of a torque converter clutch is controlled with a two-state directional valve and a single solenoid operated pressure control valve. In operation, the directional valve is spring biased to a release state in which converter feed pressure is directed to a passage between the clutch plate and the converter input shell to release the clutch and feed the converter. The return fluid from the opposite (apply side) of the clutch is routed through the directional valve to a low pressure fluid cooler. A control pressure generated by the solenoid operated valve develops a hydraulic bias which opposes the spring bias. When the hydraulic bias is sufficiently great, the directional valve shifts to a control state in which the solenoid operated valve controls the pressure supplied to either the apply or release side of the clutch to control its torque capacity.

50504584, Sep 24, 1991

Feb 7, 1991

7/651888

William J. Vukovich - Ypsilanti MI
Melissa M. Koenig - Ann Arbor MI
Tsunlock A. Yu - Ypsilanti MI

General Motors Corporation - Detroit MI

B60K 4118

74866

An improved control method for properly coordinating a double transition upshift. The state changes of the various clutches of the transmission are sequenced in relation to a dynamic measure of the transmission speed ratio so as to provide consistent high quality shifting. Closed-loop pressure controls are employed in conjunction with the sequencing to ensure timely shift completion.