INPUT TORQUE TRIM FOR TRANSMISSION SHIFT CONTROL DURING REGENERATIVE BRAKING

摘要

A system and method for controlling a step-ratio transmission gearshift during a regenerative braking event for a hybrid vehicle having an engine selectively coupled to an electric machine and an automatic transmission control transmission input torque based on a measured shift profile and a target shift profile. A torque trim term may be added to the transmission input torque or electric machine output torque in response to a difference between the measured and target shift profiles. The torque trim term may be used to modify the transmission input torque to speed the shift up or shorten the shift time if the measured shift is progressing too slowly. Likewise, the torque trim term may be used to reduce the transmission input torque or electric machine output torque if the shift is progressing too quickly relative to the target shift profile.

主权项

1. A hybrid vehicle, comprising:
an electric machine coupled to an engine and a transmission by first and second clutches, respectively; and a controller configured to adjust a transmission input torque based on a difference between a target shift profile and a measured shift profile during an inertia phase of a transmission downshift event conducted while the hybrid vehicle is in a regenerative braking mode.