Method and open-loop and closed-loop control device for compensating for a clutch torque of a hybrid separating clutch taking into consideration the rotational speed of an electric machine

Abstract

A method and an open-loop and closed-loop control device for compensating for a clutch torque of a separating clutch located between an internal combustion engine and an electric machine in a hybrid drive of a motor vehicle. The compensation takes into consideration the rotational speed of the electric machine. The rotational speed of the electric machine impacts clutch torque. A compensation factor is calculated, and increases or decreases the necessary clutch torque, causing a corresponding actuation of an actuator to achieve the necessary clutch torque.

What is claimed is: 
     
         1 . A system, comprising:
 a separating clutch located axially between an internal combustion engine and an electric machine;   an actuator configured to selectively actuate the separating clutch; and   a control device coupled to the electric machine and configured to, during driving operation:   determine a rotational speed of the electric machine;   determine a required clutch torque for actuation of the separating clutch that increases or decreases based on the rotational speed of the electric machine; and   command the actuator to move a desired travel distance that corresponds with the rotational speed of the electric machine to achieve the required clutch torque.   
     
     
         2 . The system of  claim 1 , wherein the control device is configured to, during driving operation, determine the required clutch torque further based on a driving mode. 
     
     
         3 . The system of  claim 1 , wherein the control device is configured to, during driving operation, determine the desired travel distance further based on a calibration function. 
     
     
         4 . The system of  claim 3 , wherein the control device is configured to store the calibration function. 
     
     
         5 . The system of  claim 1 , wherein the control device is an open-loop and closed-loop control device. 
     
     
         6 . The system of  claim 1 , wherein the control device is configured to, during driving operation, determine a torque capacity for the separating clutch based on the desired travel distance. 
     
     
         7 . A system, comprising:
 a separating clutch located axially between an internal combustion engine and an electric machine, the separating clutch including a clutch disk and a disk spring selectively engageable with the clutch disk; and   a control device in communication with the electric machine and being configured to, during driving operation:   determine a rotational speed of the electric machine and a position of the disk spring relative to the clutch disk;   determine a required clutch torque for actuation of the separating clutch that increases or decreases based on the rotational speed of the electric machine;   determine a desired distance between the clutch disk and the disk spring based on the required clutch torque; and   update the position of the disk spring based on the desired distance.   
     
     
         8 . The system of  claim 7 , wherein the control device is configured to, during driving operation, determine the required clutch torque further based on a driving mode. 
     
     
         9 . The system of  claim 7 , wherein the control device is configured to, during driving operation, determine the desired travel distance further based on a calibration function. 
     
     
         10 . The system of  claim 9 , wherein the control device is configured to store the calibration function. 
     
     
         11 . The system of  claim 7 , wherein the control device is an open-loop and closed-loop control device. 
     
     
         12 . The system of  claim 7 , wherein the clutch disk is co-rotationally connected to the internal combustion engine. 
     
     
         13 . The system of  claim 7 , wherein the disk spring is co-rotationally connected to the electric machine. 
     
     
         14 . The system of  claim 7 , wherein the control device is configured to, during driving operation, determine a torque capacity for the separating clutch based on the desired distance. 
     
     
         15 . A method, comprising, during driving operation:
 determining a rotational speed of an electric machine;   determining a required clutch torque for actuation of a separating clutch that increases or decreases based on the rotational speed of the electric machine, wherein the separating clutch is located axially between an internal combustion engine and the electric machine; and   commanding an actuator to move a desired travel distance that corresponds with the rotational speed of the electric machine to achieve the required clutch torque, wherein the actuator is configured to selectively actuate the separating clutch.   
     
     
         16 . The method of  claim 15 , further comprising determining the required clutch torque further based on a driving mode. 
     
     
         17 . The method of  claim 15 , further comprising determining the desired travel distance further based on a calibration function. 
     
     
         18 . The method of  claim 17 , further comprising storing the calibration function in a memory of a control device. 
     
     
         19 . The method of  claim 18 , wherein the control device is an open-loop and closed-loop control device. 
     
     
         20 . The method of  claim 15 , further comprising determining a torque capacity for the separating clutch based on the desired travel distance.