Martin R Dadel

6358184, Mar 19, 2002

May 10, 2000

09/567597

Todd M Steinmetz - Indianapolis IN
Gregory A Hubbard - Carmel IN
Charles Francis Long - Pittsboro IN
Sean E Gleason - Indianapolis IN
Jeffrey Kurt Runde - Fishers IN
Phillip F McCauley - Zionsville IN
Martin Robert Dadel - Indianapolis IN

General Motors Corporation - Detroit MI

F16H 6106

477143, 477154, 477159, 701 60

An improved control for an automatic transmission garage shift, wherein a dynamic model of the transmission is used to estimate the transmission input torque during the shift and to schedule the on-coming clutch pressure in accordance with the estimated input torque to achieve a desired input shaft trajectory. The transmission input torque is estimated based on two different methodologies âone suited to steady-state engine idle conditions, and the other suited to engine output torque transient conditions. A fuzzy summation of the input torques provided by the two methodologies is utilized in transitions between the two conditions. Shift quality variations due to variations in mechanical and/or hydraulic stiffness are minimized by a pause or hold interval inserted between the end of the fill period and the initiation of on-coming clutch pressure control, which results in a reasonably consistent degree of perceived transmission-to-transmission hydraulic and mechanical compliance.

6382248, May 7, 2002

Feb 23, 2001

09/790952

Charles Francis Long - Pittsboro IN
Michael Leo Duhaime - Novi MI
Martin Robert Dadel - Indianapolis IN

General Motors Corporation - Detroit MI

F15B 13043

137557, 13762564, 13762566

An improved and self-diagnosing shift pressure regulator apparatus for an automatic shift transmission provides a diagnostic output that reliably and timely detects initiation and cessation of fluid supply to a friction element. The regulator apparatus includes a pressure regulator valve responsive to an electronically developed pilot pressure, and a diagnostic switch. The pilot pressure positions the pressure regulator valve in one of three statesâON, TRIM, and OFFâand the diagnostic switch is continuously activated by a control pressure whenever the pressure regulator valve is in the TRIM or ON states.

6520881, Feb 18, 2003

Aug 6, 2001

09/922166

Charles Francis Long - Pittsboro IN
Martin Robert Dadel - Indianapolis IN

General Motors Corporation - Detroit MI

F16H 3100

475119, 475128

The power transmission has a fly-by-wire electro-hydraulic control mechanism that controls the engagement and disengagement of the range clutches in both forward and reverse operation. In forward operation, the control mechanism permits continued vehicle operation in the third forward range should electrical discontinuance occur during the first through fourth forward ranges, and in the fifth forward range should electrical discontinuance occur in the fifth or sixth forward range. Also, the control mechanism includes two logic valves and a forward on/off solenoid valve that permits the logic valves to control three torque-transmitting mechanisms with the use of two trim solenoid valves.

56403224, Jun 17, 1997

Jan 11, 1996

8/596879

Bradley Lee McCafferty - Zionsville IN
Martin Robert Dadel - Plainfield IN

General Motors Corporation - Detroit MI

G06G 770

3644241

A system to control the operation of a vehicular transmission embodying the concepts of the present invention utilizes a controller, at least one pulse width modulation solenoid valve and a torque transfer device operatively controlled by each of the solenoid valves so as to regulate a transmission system. The controller operatively imposes not only a varying modulation frequency on each of the solenoid valves, but also a varying modulation duty cycle on each of the solenoid valves. The controller also operatively varies the modulation rate of said frequency and said duty cycle of the fluid pressure operating the plurality of torque transfer devices, thus controlling the operation of each solenoid valve such that it does not impose a torque spike on the operation of the transmission as each solenoid valve applies fluid pressure to the appropriate torque transfer device. Accordingly, the controller provides smooth and quiet operation of the transmission.

56694733, Sep 23, 1997

May 6, 1996

8/642982

Charles Francis Long - Pittsboro IN
Martin Robert Dadel - Indianapolis IN

General Motors Corporation - Detroit MI

F16H 4502

192 33

A hydraulic control for a transmission has a main line regulator, a torque converter clutch relay valve and a torque converter clutch solenoid valve. During torque converter operation, the pressure regulator is subjected to a line pressure bias signal and supplies pressurized hydraulic fluid to a control system at a substantially constant pressure level. During torque converter clutch operation, the pressure regulator is subjected to an additional line pressure bias signal and a variable pressure bias signal from the torque converter clutch solenoid valve to provide a modulated pressure control whereby main pressure is varied proportionally with torque converter clutch apply pressure.

51019418, Apr 7, 1992

Oct 17, 1990

7/599198

Charles F. Long - Indianapolis IN
Martin R. Dadel - Plainfield IN

General Motors Corporation - Detroit MI

F16D 5702

188290

A hydraulic retarder is disposed to receive fluid as directed by a flow valve to selectively retard vehicle motion. The flow valve responds to an operator controlled modulator valve to direct fluid from a cooler which is supplied from a torque converter to the hydraulic retarder upon a request by the operator. A modulator valve is also effective to control the pressure of the fluid exiting the cooler and entering the retarder.

54563402, Oct 10, 1995

Jul 2, 1993

8/086419

Martin R. Dadel - Plainfield IN
Charles F. Long - Pittsboro IN

General Motors Corporation - Detroit MI

F16D 5702

188294

A retarder control embodying the concepts of the present invention utilizes a spool valve having a spool valve member axially translatable between an on- and an off-position. A spring is employed to bias the spool valve member toward its off-position. A torque converter, a cooler and a retarder each have an input and an output that are ported through the spool valve. The retarder is selectively ported to a hydraulic return through the spool valve, and a modulating solenoid may be employed to feed pressurized hydraulic fluid against the spool valve member not only to move the spool valve member against the spring toward its on-position but also to regulate the axial translation of the spool valve member in order to control the pressure at the retarder discharge that is also ported through the spool valve. A cooler communicates directly with the converter when the spool valve member is in its off-position. To the contrary, the cooler communicates directly with the retarder when the spool valve member is in the on-position.

59112441, Jun 15, 1999

Aug 18, 1998

9/135757

Charles Francis Long - Pittsboro IN
Martin Robert Dadel - Indianapolis IN
Jeffrey Jay Cole - Plainfield IN

General Motors Corporation - Detroit MI

F15B 13043

13762564

A pressure control valve system for a friction device has a regulator valve with a plurality of pressure feedback differential areas which are selectively pressurized during the engagement of a friction device to control the apply pressure at one rate during normal operation and at a higher rate during high torque demand operation. A plug valve is disposed adjacent the regulator valve to establish two variable control forces acting on the regulator valve in response to a variable control pressure. The combination of the differential areas and the plug valve permit the regulator valve to establish two distinct pressure gain functions, each of which has a knee or inflection point resulting in two pressure gain ratios.