System and method for determining engine pull-up threshold
AssigneeFord Global Technologies, LLC
InventorsRajit JOHRI, Jason MEYER, Jeffrey Allen DOERING
Life of this patent
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Abstract
A system and method for modifying the engine pull-up (EPU) logic within a hybrid vehicle based on max motor torque that accounts for the drop or change in available motor torque due to the opening/slipping of a torque converter bypass clutch during engine starts is disclosed. An engine pull-up threshold is determined from max available motor torque at a virtual impeller speed, where the virtual impeller speed is the impeller speed that would result if the torque converter bypass clutch was open/slipping and transferring the same amount of torque.
Claims20
A vehicle, comprising:
- a powertrain including an engine, a torque converter having a bypass clutch, and a motor configured to be selectively coupled to the engine;
- and
- a controller programmed to restart the engine in response to the bypass clutch of the torque converter being locked and a motor torque exceeding an engine pull up threshold based on a maximum available motor torque determined from a virtual impeller speed of the torque converter.
An engine pull up system for a vehicle having an engine selectively coupled to a motor, comprising:
- a controller programmed to restart the engine in response to a bypass clutch of a torque converter being locked and a motor torque exceeding an engine pull up threshold based on a maximum available motor torque determined from a virtual impeller speed of the torque converter, wherein the virtual impeller speed is determined from a speed that would have resulted if the bypass clutch of the torque converter was fully open for a turbine speed and a turbine torque.
A method for control of a vehicle having a motor selectively coupled to an engine, comprising:
- controlling engine pull up in response to a bypass clutch of a torque converter being locked and a motor torque exceeding an engine pull up threshold associated with a maximum available motor torque determined from a virtual impeller speed of the torque converter.
Dependencies are inferred from the claim text.