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US 6,550,593 B2Granted
Method to accelerate torque transmitting conditions within a clutch
AssigneeZF Friedrichshafen AG
InventorsMarkus Henneken, Hansjörg Rosi
Life of this patent
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Abstract
Within the scope of the method for acceleration of the torque breakdown of clutches in automatic transmissions, the follow-up of the hydraulic pressure and therewith the torque breakdown are accelerated by an over-compensation in the control.
Claims5
A method for accelerating the torque reduction of an electronically controlled clutch in an automatic transmission, the method comprising the steps of:
- providing an electronic controller to determine a desired hydraulic charge pressure for the clutch;
- applying the desired hydraulic charge pressure to the clutch via a follow-up hydraulic pressure over a time period;
- and
- accelerating the torque reduction in the clutch by determining in the electronic controller a lower initial hydraulic charge pressure to lessen the time period within which the follow-up hydraulic pressure brings the clutch to the desired hydraulic charge pressure.
1 more element
A method for accelerating the torque reduction of a positively engaged clutch in an electronically controlled clutch in an automatic transmission, the method comprising the steps of:
- providing an electronic controller to determine a desired hydraulic charge pressure for the clutch and a lower initial hydraulic charge pressure as a first pressure difference (Δ_P1) below the desired hydraulic charge pressure level;
- opening the positively engaged clutch by applying a follow-up hydraulic pressure based on the lower initial hydraulic charge pressure over an initial time period;
- adjusting the lower initial hydraulic charge pressure to the desired hydraulic charge pressure after the initial time period to accelerate the torque reduction in the clutch and lessen an overall time period within which the follow-up hydraulic pressure brings the clutch to the desired hydraulic charge pressure for enabling torque take-up.
Dependencies are inferred from the claim text.