Engine and motor control during wheel torque reversal in a hybrid vehicle
AssigneeFord Global Technologies, LLC
InventorsMark Steven Yamazaki, Jason Meyer, Jeffrey Allen Doering, Bernard D. Nefcy
Life of this patent
Estimating the term…
Abstract
A system and method for controlling a hybrid vehicle having an engine selectively coupled by an upstream clutch to an electric machine, which is selectively coupled by a downstream clutch to a step-ratio transmission, include at least one controller programmed to control the engine and the electric machine in response to entering a lash zone in anticipation of a wheel torque reversal to adjust a gain applied to an active motor damping torque controller to reduce driveline oscillations and backlash.
Claims18
A vehicle comprising:
- an engine selectively coupled by an upstream clutch to an electric machine, which is selectively coupled by a downstream clutch to a step-ratio transmission;
- and
- at least one controller programmed to control the engine and the electric machine in response to entering a lash zone in anticipation of a wheel torque reversal to adjust a gain applied to an active motor damping torque controller to reduce driveline oscillations and backlash, wherein the at least one controller reduces the gain prior to a zero torque point where meshing gear teeth of driveline components are floating.
A method for controlling a vehicle having an engine, an electric machine, and a transmission, comprising:
- in response to:
- a change in driver demanded torque;
- and input torque to the transmission approaching zero, reducing at least one gain of an electric machine torque feedback controller to control torque of the electric machine through a lash region associated with a driveline or wheel torque reversal.
A non-transitory computer readable storage medium having stored instructions executable by a vehicle controller to control a vehicle having an engine, a traction motor, and a transmission, comprising instructions for:
- adjusting a gain of a traction motor feedback controller in response to a change in driver demanded torque anticipated to result in a driveline torque reversal or a wheel torque reversal;
- and
- reducing the gain in response to an increase in driver demanded torque and transmission input torque approaching zero.
Dependencies are inferred from the claim text.