Hybrid electric vehicle creep control
AssigneeFord Global Technologies, LLC
InventorsJason Meyer, Rajit Johri, Mathew Alan Boesch
Life of this patent
Estimating the term…
Abstract
A vehicle includes an engine, and a transmission including a torque converter having an impeller. The vehicle further includes an electric machine configured to provide drive torque to the impeller. The impeller is selectively coupled to the engine via a clutch. At least one vehicle controller is configured to, in response to the engine being OFF, the transmission being in DRIVE, a vehicle speed being zero and a brake pedal being released beyond a threshold position, command the electric machine to provide a torque to the impeller. The torque is a predetermined feedforward torque adjusted by a feedback torque that is based on a difference between measured and calculated speeds. The speeds may be the speeds of the electric machine.
Claims19
A vehicle comprising:
- a powertrain including an electric machine driveably connected to an impeller of a torque converter;
- and
- a controller configured to, responsive to vehicle speed being zero and a brake pedal being released beyond a threshold position, command the electric machine to provide a torque to the impeller, the torque being a predetermined feedforward torque adjusted by a feedback torque that is based on a difference between actual and target electric machine speeds.
A vehicle comprising:
- an engine;
- a transmission including a torque converter having an impeller;
- an electric machine configured to provide drive torque to the impeller, and selectively coupled to the engine via a clutch;
- and
- at least one controller configured to, in response to the engine being OFF, the transmission being in DRIVE, a vehicle speed being zero and a brake pedal being released beyond a threshold position, command the electric machine to provide a torque to the impeller, the torque being a predetermined feedforward torque adjusted by a feedback torque that is based on a difference between measured and target speeds.
A method of restarting a torque-converter impeller driveably connected to an electric machine, the method comprising:
- in response to a vehicle speed being zero and a brake pedal being released beyond a threshold position, commanding the electric machine to provide a torque to the impeller, the torque being a predetermined feedforward torque proportionally adjusted according to a difference between measured and target electric machine speeds.
Dependencies are inferred from the claim text.