Gm Global Technolgoy Operations, Inc.

Scott T Weisgerber

Lawrence A Kaminsky

William R Cawthorne

Eric S Tryon

Ali K Naqvi

Jonathan M Bolenbaugh

Matthew R Knoth

A vehicle includes a transmission, an electrically-driven fluid pump which supplies pressure to a hydraulically-actuated clutch of the transmission, and pump motor sensors positioned with respect to a pump motor of the fluid pump. The sensors are configured to measure electrical properties of the pump motor, and to output the measured electrical properties as input signals. A controller detects when the hydraulic circuit is fully charged by determining an actual speed of the pump motor. The controller calculates an average pump torque and a slope of the average pump torque for the pump motor using the input signals. A flag is set via the controller indicating that a calibrated line pressure has been attained in the hydraulic circuit when the slope of the average pump torque reaches zero and the speed of the pump motor reaches a calibrated speed.

Hydraulic system charge detection

A multi-mode transmission includes a plurality of torque transfer clutches fluidly coupled to a hydraulic circuit fluidly coupled to an independently controllable hydraulic pump. Upon detecting an un-commanded activation of one of the torque transfer clutches, operation of the hydraulic pump is disabled, allowable transmission states are identified, and the one of the torque transfer clutches is synchronized. The hydraulic pump is subsequently enabled and the transmission is operated in one of the allowable transmission states.

Method and apparatus to remediate a clutch fault in a powertrain system

An energy storage system determined to be at an operating point indicative of incipient threat to its condition is permitted to continue power flow for a duration that is a function of the state of charge before a diagnosis of a critical state of charge condition is rendered. If the state of charge returns to an acceptable region before the duration expires, no diagnosis of a critical state of charge condition is rendered. Generally, the duration increases as the state of charge trends toward the region of acceptable state of charge and decreases as the state of charge trends away from the region of acceptable state of charge.

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Fishers, IN, United States of America

Scott T Weisgerber