Method and device for controlling a clutch by clutch way point coordinate system
AssigneeZF Friedrichshafen AG
InventorsRainer Petzold, Peter Herter
Life of this patent
Estimating the term…
Abstract
A method and a device for controlling a clutch, for example an automatic friction clutch forming part of a drive train of a motor vehicle, for a torque transfer between an engine and a transmission, with the clutch having significant clutch way points assigned to it. For achieving the operational readiness of the clutch over the shortest possible time period, whereby an accurate clutch adjustment is still guaranteed, a clutch way point coordinate system is monitored by checking the point of engagement of the clutch, established through a learning process and having at least a relevant clutch way point for the starting procedure. In case of any recognized change(s), the clutch way point is suitably corrected or otherwise used as is.
Claims12
A method of controlling a clutch, which forms part of a drive train of a motor vehicle, for a torque transfer between an engine and a transmission, in which significant clutch way points are assigned to the clutch, whereby a clutch way point coordinate system, achieved through a learning process and comprising at least relevant clutch way points needed for starting gear shift, being monitored by verifying an engaging point (sZ) of the clutch and, in case of a change, being one of corrected and used as measured, the method comprising the steps of:
- in order to learn a new friction point (SM), learning the point of engagement after starting the engine,
- disengaging the clutch under consideration of a constructional related minimum disengagement way point,
- with the engine running, moving the clutch under consideration a direction toward engagement until a transmission input, captured by a transmission speed monitoring of a transmission side secondary side of the clutch under consideration, exceeds a given rotation speed threshold,
- acquiring an actual engaging speed, which is the speed at which the clutch under consideration is engaged, and
- depending on the acquired actual engaging speed, correcting the determined friction point (sM) for the clutch under consideration.
Dependencies are inferred from the claim text.