Clutch control system for upshift of an electro-mechanical automatic transmission
AssigneeDaimlerChrysler AG
InventorJeffrey P Cherry
Life of this patent
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Abstract
An electro-mechanical clutch actuator system is provided for a transmission having dual input shafts with respective clutches and with a plurality of drive gears rotatably mounted to each input shaft and having synchronizer mechanisms for engaging each drive gear to one of the input shafts. The clutch actuators include an electric motor and a reduction gear assembly for moving a pawl tweeter arm and is assisted by an assist spring. The movement of the pawl tweeter arm transmits torque through a pivot arm which in turn, act to engage or disengage its corresponding clutch. An upshift clutch control algorithm is provided to facilitate shifting to a higher gear, which monitors and regulates movement of the clutch actuator motors.
Claims10
A method of upshifting an electro-mechanical automatic transmission comprising first and second input shafts operatively driven by first and second friction clutches, the first and second friction clutches being manipulated by first and second clutch actuators, said method comprising the steps of:
- gradually disengaging said first clutch, said first clutch being mechanically coupled to a first gear, said first gear being a current gear, wherein a clutch position of said first clutch during disengagement is calculated as a function of engine torque;
- and
- engaging said second clutch, said second clutch being mechanically coupled to a second gear, wherein a clutch position of said second clutch during engagement of said second clutch is calculated as a function of engine speed, a slip command and a target speed.
Dependencies are inferred from the claim text.