| 摘要 |
A method of operating a transmission of a vehicle drive-train when a gearshift from a current gear toward a target gear has been requested. The transmission having frictional shifting elements and at least one interlocking shifting element. If an actuating electrical current, equivalent to a closed operating condition of the frictional shifting element to be engaged, and an actuating electrical current, equivalent to an open operating condition of the interlocking shifting element to be disengaged, are determined while, at the same time, a closed operating condition of the interlocking shifting element to be disengaged is detected by a sensor, a fault is recognized. If the fault is recognized during a predefined test period, one or more selected shifting elements are disengaged and a force flow in the transmission is interrupted. Alternatively, by disengaging the frictional shifting element to be engaged, the current gear is engaged in the transmission. |
| 主权项 |
1. A method of operating a transmission device (1) of a vehicle drive-train when there is a request for a gearshift from a currently engaged gear (“4” or “7”) to a target gear (“5” or “8”), the transmission device having a plurality of frictional shifting elements (B, C, D, E) and at least one interlocking shifting element (A, F), comprising first and second mating shifting element halves, which are selectively engaged or disengaged by an electro-hydraulic actuating device to obtain various gears (“1” to “R”), the actuating device sets actuating electrical currents for electrically operated actors to specify hydraulic actuating pressures (p_A, p_B, p_C, p_D, p_E, p_F) for actuating the frictional and the interlocking shifting elements (A to F), for carrying out the requested gearshift, the at least one interlocking shifting element (F or A) has to be disengaged and at least one of the frictional shifting elements (B or C) has to be engaged, and an engaged operating condition of the frictional and the interlocking shifting elements (A to F) is recognized by determining a value of an operating condition dependent actuating current, at which the shifting element (A to F) concerned is either changed to or maintained in the engaged operating condition, the method comprising the steps of:
determining the actuating currents of all the frictional and the interlocking shifting elements (A to F) while the required gearshift is being carried out to determine current operating conditions of each of the frictional and the interlocking shifting elements (A to F); testing, with a sensor device, a plausability of the current operating condition of the interlocking shifting element (F or A) to be disengaged; recognizing a fault when both:
an actuating current equivalent to an engaged operating condition of the frictional shifting element (B or C) to be engaged is determined, andan actuating current equivalent to a disengaged operating condition of the interlocking shifting element (F or A) to be disengaged is determined, and, at the same time, the sensor device determines that the interlocking shifting element (F or A) to be disengaged is engaged; andwhen the fault is recognized over a predefined test period, either:
disengaging one or more selected shifting elements and interrupting a force flow in the transmission device (1), ordisengaging the frictional shifting element (B or C) to be engaged so as to maintain continued engagement of the currently engaged gear (“4” or “7”) of the transmission device (1). |
