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US 6,471,613 B1Granted
Transmission with variable line pressure
AssigneeDaimlerChrysler AG
InventorsValentin Botosan, Berthold Martin
Life of this patent
Estimating the term…
Abstract
A unique regulator valve arrangement is provided for an automatic transmission which provides variable line pressure. The line pressure is actively regulated through the regulator valve configuration with a variable force solenoid. The arrangement allows line pressure to be maintained at a minimal value according to a given condition while avoiding clutch slip.
Claims4
A hydraulic control system for an automatic transmission including a planetary gear system having a plurality of clutch elements to alter the torque ratio of the transmission, said hydraulic control system comprising:
- a hydraulic fluid pump;
- a hydraulic fluid source;
- a manual valve selectively movable between a plurality of positions and communicating with said hydraulic fluid source, said plurality of positions including reverse and drive;
- and
- a line pressure control device for variably regulating hydraulic pressure supplied from said fluid source to line pressure, said line pressure control device includes a line pressure regulating valve, a solenoid for actuating said pressure regulating valve, and a pressure sensing device, wherein said line pressure regulating valve includes a first fluid passage communicating with said hydraulic fluid pump and said solenoid.
2 more elements
Dependencies are inferred from the claim text.