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AssigneeZF Friedrichshafen AG
InventorsAlain Tierry Chamaken Kamde, Wilhelm Moser
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A method for operating a pneumatic actuating system of a transmission. The actuating system has an air reservoir at a first pressure. The reservoir couples an actuating space of the actuating system which is at a second pressure, and the actuating space couples, via control valves, shifting cylinders. When conducting a transmission gearshift, an air mass delivered to the active shifting cylinders via corresponding control valves, and an air mass sum including a nominal air mass in the active cylinders required for accomplishing the gearshift and an actual basic leakage from the activated shifting cylinder are determined. A defect leak in the pneumatic actuating system is recognized, if the air mass delivered to the active shifting cylinders is larger than the air mass sum. If a defect leak is recognized, the control valves coupling the actuating space and the shifting cylinders are shut off for a period of time.
A method of operating a pneumatic actuating system of a transmission, the actuating system having an air reservoir in which a first pressure is present, the air reservoir being coupled to an actuating space of the actuating system in which a second pressure is present, and the actuating space being coupled, by way of control valves, to shifting cylinders, the method comprising:
A method for operating a pneumatic actuating system of a transmission, the actuating system having an air reservoir in which a first pressure is present, the air reservoir being coupled to an actuating space of the actuating system in which a second pressure is present, and the actuating space being coupled to shifting cylinders by way of control valves, the method comprising:
A control unit for operating a pneumatic actuating system of a transmission, the actuating system comprising an air reservoir in which a first pressure is present, the air reservoir being coupled to an actuating space of the actuating system in which a second pressure is present, and the actuating space being coupled to shifting cylinders by way of control valves, and, when a gearshift is carried out in the transmission, the control unit actuates the control valves and determines an air mass delivered to active shifting cylinders via the corresponding control valves and an air mass sum consisting of a nominal air mass in the active shifting cylinders required for carrying out the gearshift and an actual basic leakage from the activated shifting cylinder, and, if the air mass delivered to the active shifting cylinders is larger than the air mass sum, the control unit detecting a defect leak in the pneumatic actuating system, and, if a defect leak is determined, the control unit initiates a compensatory reaction in the pneumatic actuating system.
Dependencies are inferred from the claim text.