01-03-2012 дата публикации
Номер: US20120053010A1
Автор:
Ming Lang Kuang,
Shailesh Shrikant Kozarekar,
Fazal Urrahman Syed,
Edward William Haran,
Jonathan Andrew Butcher,
Kimberly Murphy,
KUANG MING LANG,
KOZAREKAR SHAILESH SHRIKANT,
SYED FAZAL URRAHMAN,
HARAN EDWARD WILLIAM,
BUTCHER JONATHAN ANDREW,
MURPHY KIMBERLY
A system and method for controlling a hybrid electric vehicle powertrain having an engine, a generator, and a motor connected via a planetary gear set to detect lockup in the planetary gear set and control the powertrain in response. When torque is distributed in an electric mode of operation with the engine disabled, the generator is disabled based at least upon a difference between actual generator speed and an expected generator speed exceeding a threshold, indicating a lockup in the planetary gear set. When the engine is activated and distributes torque through the powertrain, the engine and the generator are disabled based at least upon a difference between engine acceleration and an expected engine acceleration exceeding a first threshold, and a difference between engine speed and ring gear speed being less than a second threshold. 1. A method for controlling a hybrid vehicle having an engine and a traction motor coupled to a driveline including a generator and a planetary gear set with a ring gear , comprising: a difference between engine acceleration and expected engine acceleration exceeding a first threshold, and', 'a difference between engine speed and ring gear speed being less than a second threshold, indicating a lockup in the planetary gear set., 'disabling the generator based at least upon2. The method of claim 1 , wherein the generator is coupled to the planetary gear set and electrically connected to the traction motor claim 1 , the method further comprising disabling the engine when the lockup in the planetary gear set is indicated.3. The method of claim 1 , wherein disabling the generator includes disabling the generator based at least upon:a difference between the engine speed and a target engine speed exceeding a third threshold, andgenerator torque exceeding a fourth threshold.4. The method of claim 1 , further comprising delivering torque from the traction motor to vehicle wheels upon the disabling of the generator.5. The method of claim 1 , ...
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