David Juhassz

20130175135, Jul 11, 2013

Jan 6, 2012

13/345141

David Juhassz - Sterling Heights MI, US
Lynn M. Krawczyk - Plymouth MI, US

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

F16D 25/00
F16K 31/12

192 8501, 251 12, 13762548

A fluid retention assembly for a vehicle transmission has a valve body, a first member, a second member, and a biasing member. The valve body has a first portion, a second portion, a third portion, and defines a central bore having a sealing portion. The first member is disposed at least partially in the central bore of the valve body and includes a shaft portion and a sealing portion. The second member defines a plurality of fluid apertures. The second member is attached to the shaft portion of the first member opposite the sealing portion. The biasing member is disposed at least partially in the central bore of the valve body coaxial with the first member and has a biasing force that biases the sealing portion of the first member against the sealing portion of the valve body.

20130080009, Mar 28, 2013

Sep 23, 2011

13/242245

Zhen J. Zhang - Canton MI, US
David Juhassz - Sterling Heights MI, US
John E. Marano - Milford MI, US

GM Global Technology Operations LLC - Detroit MI

F16H 61/12
G06F 19/00

701 63

A control system for a dry dual clutch transmission (DCT) includes first, second, and third modules. The first module detects whether a hydraulic pressure sensor of a hydraulic fluid delivery system in the dry DCT has failed. The second module estimates a pressure of hydraulic fluid within an accumulator of the hydraulic fluid delivery system based on one of (i) torque generated by and temperature of a hydraulic fluid pump and (ii) a drain down period of the accumulator and a period since the hydraulic fluid pump was on. The third module controls start/stop of the hydraulic fluid pump based on the estimated hydraulic fluid pressure when the hydraulic pressure sensor has failed.