Ford Global Technolgoies, LLC

Andrew James Myrna

Samuel Melville Glauber

Timothy Fedullo

Scott Joseph Gittins

Benjamin Rupley

Ryan Eggebrecht

Jessica Dyan Britton

Air ingestion into a transmission hydraulic system may lead to a number of issues. For example, the time to engage a hydraulically actuated parking mechanism may be excessive. As another example, the pump may not prime properly on a subsequent engine start. The air ingestion issue may be detected based on variability of transmission line pressure. When the line pressure variability exceeds a threshold, actions are taken to mitigate the potential issues.

Transmission controls to mitigate line pressure instability

A vehicle includes an engine, a transmission, and a controller. The transmission has clutches, a circuit configured to transport fluid to the clutches, a pump configured to circulate the fluid through the circuit, and an accumulator disposed along the circuit. The controller is programmed to, responsive to an engine start and a fluid temperature being less than a temperature threshold, discharge the accumulator to prime the pump.

Vehicle and system for controlling a vehicle transmission

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Royal Oak, MI, United States of America

Andrew James Myrna