Automatic clutch calibration
AssigneeVolvo Truck Corporation
InventorsLars Karlsson, Johan Bjernetun
Life of this patent
Estimating the term…
Abstract
A method for automatic detection of need for clutch calibration includes registering and storing in a data memory, before or in connection with engine shut down, a value of a clutch operating parameter, registering a corresponding value of the clutch operating parameter in connection with subsequent engine start up, and determining need for clutch calibration if the difference between the stored value of the clutch operating parameter and the corresponding value of the clutch operating parameter exceeds a predetermined threshold value.
Claims20
Method for automatic detection of need for clutch calibration, the method comprising:
- registering and storing in a data memory, before or in connection with engine shut down, a value of a clutch operating parameter;
- registering a corresponding value of the clutch operating parameter in connection with subsequent engine start up;
- determining need for clutch calibration if the difference between the stored value of the clutch operating parameter and the corresponding value of the clutch operating parameter exceeds a predetermined threshold value;
- performing an automatic clutch calibration if a need for clutch calibration has been determined;
- performing the automatic clutch calibration by updating at least one stored clutch control parameter with a value corresponding to the determined difference between the stored value of the clutch operating parameter and the corresponding value of the clutch operating parameter;
- and
- performing the automatic clutch calibration by updating and displacing more than one point on a stored complete clutch characteristic curve.
Clutch system comprising a friction clutch and an electronic control unit, wherein the control unit is programmed to automatically detect need for clutch calibration by performing the steps of:
- registering and storing in a data memory, before or in connection with engine shut down, a value of a clutch operating parameter;
- registering a corresponding value of the clutch operating parameter in connection with subsequent engine start up;
- and
- determining need for clutch calibration if the difference between the stored value of the clutch operating parameter and the corresponding value of the clutch operating parameter exceeds a predetermined threshold value;
- and
- performing an automatic clutch calibration if a need for clutch calibration has been determined;
- performing the automatic clutch calibration by updating at least one stored clutch control parameter with a value corresponding to the determined difference between the stored value of the clutch operating parameter and the corresponding value of the clutch operating parameter;
- and
- performing the automatic clutch calibration by updating and displacing more than one point on a stored complete clutch characteristic curve.
A computer system for implementing a method for automatic detection of need for clutch calibration, the method comprising
- registering and storing in a data memory, before or in connection with engine shut down, a value of a clutch operating parameter;
- registering a corresponding value of the clutch operating parameter in connection with subsequent engine start up;
- determining need for clutch calibration if the difference between the stored value of the clutch operating parameter and the corresponding value of the clutch operating parameter exceeds a predetermined threshold value;
- and
- performing an automatic clutch calibration if a need for clutch calibration has been determined;
- performing the automatic clutch calibration by updating at least one stored clutch control parameter with a value corresponding to the determined difference between the stored value of the clutch operating parameter and the corresponding value of the clutch operating parameter;
- and
- performing the automatic clutch calibration by updating and displacing more than one point on a stored complete clutch characteristic curve.
Dependencies are inferred from the claim text.