Method for determining an operating condition of a positively engaging shifting element of a transmission device
AssigneeZF Friedrichshafen AG
InventorRainer NOVAK
Life of this patent
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Abstract
A method of determining an operating state of a form-locking shift element of a transmission apparatus that, at least for changing one operating state between a disengaged operating state and an engaged operating state, is pressurized with an actuating pressure by a pressure-conducting region of the transmission apparatus. The pressure of the pressure-conducting region is monitored. Depending on the progression of the pressure of the pressure-conducting region, while pressurizing the form-locking shift element with the actuating pressure for changing the operating state, checking whether the form-locking shift element has the requested operating state.
Claims11
1-10. (canceled)
A method of determining an operating state of a form-locking shift element (8) of a transmission apparatus that, at least for changing an operating state between a disengaged operating state and an engaged operating state, is pressurized by a pressure-conducting region (5) of the transmission apparatus with an actuating pressure, the method comprising the steps of:
- monitoring the pressure (p_sys) of the pressure-conducting region (5);
- and
- checking whether the form-locking shift element (8) has changed to a requested operating state, depending on a progression of the pressure (p_sys_ist) of the pressure-conducting region (5) during the pressurization of the form-locking shift element (8) with actuating pressure for the change of the operating state.
Dependencies are inferred from the claim text.