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US 9,067,600 B2Granted
Engine speed control apparatus and method for a hybrid vehicle
AssigneeFord Global Technologies, LLC
InventorsWei Liang, Carol Louise Okubo, Thomas Chrostowski, Ming Lang Kuang
Life of this patent
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Abstract
A vehicle powertrain system has an engine, a damper and an electric machine configured to be selectively mechanically coupled with the engine via damper. The vehicle powertrain system also has at least one controller programmed to filter a frequency content of a speed or torque command for the electric machine corresponding to a resonant frequency of the engine, damper and electric machine to reduce resonance of the engine, damper and electric machine.
Claims12
A vehicle comprising:
- an electric machine mechanically coupled with an engine via a damper;
- and
- a controller programmed to
- measure a speed of the electric machine,
- generate a torque command based on a difference between the measured electric machine speed and a commanded electric machine speed,
- filter a frequency content of the torque command to remove a resonant frequency of the engine, damper and electric machine, and
- issue the filtered command to the electric machine.
4 more elements
A method comprising:
- in response to a speed or torque command for an electric machine, filtering a frequency content of the command corresponding to a resonant frequency of a powertrain system including an engine, damper and the electric machine to reduce vibration of the powertrain system while the engine is generating power.
A powertrain system comprising:
- an electric machine mechanically coupled with an engine via a damper;
- and
- at least one controller programmed to
- generate a torque command based on a measured electric machine speed and a commanded electric machine speed, wherein the torque command is filtered to remove a resonant frequency of the powertrain system, and
- while the engine is generating power, issue the torque command to the electric machine.
2 more elements
Dependencies are inferred from the claim text.