Apparatus and method for operating a clutch in a transmission

摘要

A method to control a clutch in a transmission includes monitoring a frequency response of the clutch including monitoring a response repeating one time per revolution of the clutch a response repeating more than one time per revolution of the clutch. A ratio of the response repeating more than one time per revolution of the clutch to the response repeating one time per revolution of the clutch is determined and compared to a first threshold ratio. A likely shudder condition is indicated based upon the comparing.

主权项

1. A control module-implemented method to control a clutch in a transmission, comprising:
monitoring a frequency response at a single location in the transmission comprising a point of engagement between mating surfaces of the clutch and a clutch housing when the clutch is cyclically loaded during a transition from a present gear number operation to a predicted next gear number operation, comprising:
monitoring a first amplitude indicative of a number of occurrences a response repeats one time per revolution of the clutch, said response being indicative of a peak friction value between the mating surfaces; andmonitoring at least a second amplitude indicative of a number of occurrences the response repeats more than one time per revolution of the clutch; determining a ratio of at least the second amplitude to the first amplitude; and during the transition from the present gear number operation to the predicted next gear number operation when the clutch is cyclically loaded, determining one of:
a first shudder condition indicative of shudder requiring remedial action that includes modifying operation of the clutch when the ratio of at least the second amplitude to the first amplitude is at least a first threshold ratio of fifty percent;a second shudder condition indicative of shudder requiring remedial action that includes generating a service warning indicating a need to change transmission fluid when the ratio of at least the second amplitude to the first amplitude is less than the first threshold ratio and at least a second threshold ratio of thirty percent.