Hybrid powertrain speed control
AssigneeFord Global Technologies, LLC
InventorsWei Liang, Rajit Johri, Xiaoyong Wang, Mark Steven Yamazaki, Ming Lang Kuang, Jeffrey Allen Doering
Life of this patent
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Abstract
In at least one embodiment, a vehicle powertrain includes an engine and an electric machine mechanically coupled by a clutch. The powertrain also includes a torque converter configured to fluidly couple the electric machine to an output shaft. A controller is programmed to command a rotational speed output of the electric machine to the torque converter based on a predicted torque delivered across the clutch. The controller is further programmed to modify the command based on a difference between the commanded rotational speed output and an actual rotational speed output of the electric machine.
Claims13
A hybrid powertrain control method comprising:
- issuing commands for an engine to generate and deliver an estimated torque across a clutch;
- issuing a command for an electric machine to output rotational speed based on the estimated torque delivered across the clutch;
- measuring actual rotational speed of the electric machine;
- providing feedback from a feedback loop indicating a discrepancy between the commanded and actual rotational speeds;
- and
- modifying the command for the electric machine to minimize the discrepancy.
A hybrid powertrain control method comprising:
- issuing commands for an engine to generate and deliver an estimated torque across a clutch;
- issuing a command for an electric machine to output rotational speed based on the estimated torque delivered across the clutch;
- measuring actual rotational speed of the electric machine;
- providing feedback from a feedback loop indicating a discrepancy between the commanded and actual rotational speeds;
- modifying the command for the electric machine to minimize the discrepancy;
- and
- in response to a downshift of a transmission gear ratio during vehicle travel speed less than a speed threshold, the command for the electric machine causes a predetermined rotational speed during a disengagement of a torque converter that is configured to fluidly couple the electric machine to a powertrain output shaft.
Dependencies are inferred from the claim text.