Method for checking the plausibility of the position of the clutch actuator of a clutch, method for determining the touch point of a clutch, and device for carrying out the method

US8052579B2 · kind B2 · utility

Assignee

• Schaeffler Technologies AG & Co. KG · DE

Inventors

• Juergen Eich · Laufenburg (Baden), DE
• Ekkehard Reibold · Lahr (Eifel), DE
• Minh Nam Nguyen · Laufenburg (Baden), DE
• Matthias Panzer · Karlsruhe, DE

Key dates

• Filing date: May 30, 2008
• Grant date: Nov 8, 2011
• Expiry date: May 27, 2030

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16D2500/5026
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for checking the plausibility of an actuation position of a clutch of a double-clutch transmission operated by an actuator, including the following steps: disengaging the clutch assigned to the currently active old subtransmission and simultaneously engaging the clutch assigned to the other subtransmission to shift from the gear selected in the old subtransmission to a gear selected in the other, new subtransmission; deselecting the gear selected in the old subtransmission still during the overlapping operation of the clutches or immediately thereafter; detecting the difference between the speed of rotation of a drive shaft of the double-clutch transmission driven by a drive motor and the speed of rotation of the input shaft of the old subtransmission; and evaluating the state of the clutch assigned to the old subtransmission as disengaged when the difference in speeds of rotation exceeds a predetermined value within a predetermined time after deselection of the gear.