Methods and systems for assisted direct start control
AssigneeFord Global Technologies, LLC
InventorsAlex O'Connor Gibson, Joseph Norman Ulrey, Gregory Michael Pietron, Seung-Hoon Lee, Yuji Fujii
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Abstract
Methods and systems are provided for pressurizing a transmission hydraulic circuit including a transmission mechanical pump coupled to an engine though a gearbox. One example method comprises, during an engine start, adjusting a speed ratio between the transmission pump and the engine between a first speed ratio and a second speed ratio, the pump rotating faster relative to the engine at the first speed ratio as compared with the second speed ratio. In this way, the pump may be driven at different speed ratios relative to the engine to provide better pressurization in the transmission.
Claims4
A vehicle system, comprising:
- an engine;
- a transmission with a torque converter;
- a mechanical pump hydraulically coupled to the engine and the transmission;
- and
- a variable gearbox coupling the engine to the mechanical pump, the gearbox including a first gearset coupled to a second gearset along a first path via a one-way clutch, the first gearset further coupled to the second gearset along a second path, parallel to the first path, via an electric clutch.
Dependencies are inferred from the claim text.