VEHICLE TRANSMISSION WITH TIE-UP MONITORING LOGIC

摘要

A vehicle includes a prime mover, transmission, and controller. The transmission, e.g., a DCT or 8-speed automatic transmission, includes an input member, an output member, gear sets, and a plurality of clutches. The controller monitors the transmission for a threshold tie-up condition via a method, which includes processing clutch control input signals and a gearbox status signal to identify the clutches involved in a present operating mode of the transmission, e.g., a shift, neutral, or fixed gear. The controller determines the torque capacity of each involved clutch, compares the determined clutch torque capacities to respective calibrated clutch torque capacities, and executes a control action in response to a threshold tie-up condition. The threshold tie-up condition is present when the determined clutch torque capacities exceed the calibrated clutch torque capacity for at least one of the involved clutches for longer than a calibrated duration.

主权项

1. A vehicle comprising:
a prime mover having an output shaft; a transmission having an input member that is selectively connectable to the output shaft, an output member, a plurality of gear sets, and a plurality of clutches; and a controller in communication with the transmission, wherein the controller includes a processor and is programmed to monitor an operation of the transmission for a threshold tie-up condition, and to execute instructions via the processor to thereby:
process a set of clutch control input signals and a gearbox status signal to identify, from among the plurality of clutches, a set of clutches that are involved in establishing or maintaining a present operating mode of the transmission;determine an actual clutch torque capacity of a predetermined number of the involved clutches;compare the determined actual clutch torque capacities to a respective calibrated clutch torque capacity for each of the predetermined number of involved clutches; andexecute a control action with respect to the transmission in response to the threshold tie-up condition of the transmission, wherein the threshold tie-up condition is present when the determined actual clutch torque capacities exceed the calibrated clutch torque capacity for the predetermined number of the involved clutches for longer than a calibrated duration.