Method and strategy for detecting the blocking of a planetary gear in hybrid power split vehicles

摘要

A system and method for controlling a hybrid electric vehicle powertrain have an internal combustion engine, generator, and motor connected by a planetary gearset to detect lockup in the planetary gearset and to control the powertrain in response thereto. When torque is distributed in an electrical operating mode with the engine deactivated, the generator is deactivated based on at least a difference between the actual generator speed and an expected generator speed exceeding a threshold, indicating a lock in the planetary gear set. When the engine is activated and distributes torque through the powertrain, the engine and the generator are deactivated based on at least one of a difference between the engine acceleration and an expected engine acceleration exceeding a first threshold and a difference between the engine speed and the ring gear speed below a second one Threshold is.