Gm Global Technolgoy Operations, Inc.

Samuel J Harbin

Steven E Schulz

Silva Hiti

Bon Ho Bae

Harry J Bauer

Min Dai

John C Buchanan

Yan Ann Chen

A transmission storage oil level control system includes a first fluid reservoir and a second fluid reservoir separated from the first fluid reservoir by a barrier. A valve positioned in the barrier is controlled to open and close a fluid communication path between the second fluid reservoir and the first fluid reservoir. The valve is normally closed when a temperature of the hydraulic fluid is above a predetermined value. A sensor is positioned in at least one of the first reservoir and the second reservoir. The sensor identifies a condition of a hydraulic fluid. A control device communicates with the valve to apply a signal received from the sensor to selectively open and close the valve when the temperature of the hydraulic fluid is above the predetermined value.

Transmission storage oil level control with a solenoid on and off pulse

Methods and systems are provided for assessing a vehicle transmission having a resolver. A memory is configured to store preliminary data pertaining to an error of the resolver. A processor is coupled to the memory, and is configured to determine a harmonic characteristic of the preliminary data, and to assess the vehicle transmission using the harmonic characteristic.

Methods and systems for assessing vehicle transmissions

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White Lake, MI, United States of America

Samuel J Harbin