Friction clutch control with judder detection for automatic vehicle transmission

摘要

A frictional engaging clutch for an automatic vehicle transmission which discriminates judder which has occurred on the vehicle and controls to decrease the same. A clutch slip ratio (ECL) is calculated, the calculated ratio is then converted into an ac waveform which is filtered (S14) by filters acting as a judder filter and a disturbance filter to extract frequency components of an appropriate range, and the number of times (NTEX) at which the filtered waveform peaks exceeds threshold values (appropriately set) is counted (S18), and based on the counts, the judder is discriminated or determined (S22). The configuration is simple and makes it possible to discriminate judder in an automatic vehicle transmission.