UPSHIFT CONTROL OF A DRY DUAL-CLUTCH TRANSMISSION

摘要

A vehicle includes an engine, a dry dual-clutch transmission (dDCT) having a pair of input clutches and a gearbox containing oddly- and evenly-numbered gear sets, and a transmission control module (TCM). Application of one of input clutches connects the engine to a corresponding one of the oddly- or evenly-numbered gear sets. The TCM includes feed-forward PID-based control logic, and a torque-to-position (TTP) table for each input clutch. The TCM commands a position of a designated input clutch during a power-on upshift using the feed-forward, PID-based control logic, and selectively adapts the TTP table as a function of an inertia and acceleration value of the engine. The TCM may apply an asymmetrical handoff profile to commanded oncoming and offgoing clutch torques during the torque phase of the upshift. The TCM may also adjust the TTP table as a function of the frequency of use of the input clutches.

主权项

1. A vehicle comprising:
an internal combustion engine having an inertia value and an acceleration value; a dry dual-clutch transmission (dDCT) having a pair of non-lubricated input clutches and a lubricated gearbox that contains separate oddly-numbered and evenly-numbered gear sets, wherein an application of a designated one of the input clutches connects the engine to a corresponding one of the oddly-numbered or evenly-numbered gear sets; and a transmission control module (TCM) in communication with the pair of input clutches, wherein the TCM includes a processor and tangible, non-transitory memory on which is recorded a calibrated torque-to-position (TTP) table and feed-forward, proportional, integral, derivative (PID)-based control logic, and wherein the TCM is configured to:
detect a requested power-on upshift of the dDCT;command a position of the designated input clutch via the feed-forward, PID-based control logic;execute the requested power-on upshift; andselectively adapt the calibrated TTP table during the execution of the requested power-on upshift as a function of the inertia value and the acceleration value of the engine.