System and method to prevent driveline float in lash region
AssigneeFord Global Technologies, LLC
InventorsRajit Johri, Ming Lang Kuang, Francis Thomas Connolly, Bernard D. Nefcy, Yanan Zhao, Fazal Urrahman Syed
Life of this patent
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Abstract
A vehicle includes an engine and an electric machine coupled to a gearbox through a torque converter. The vehicle includes a controller programmed to command an engine torque and an electric machine torque to achieve a predetermined positive torque at the input of the torque converter when a driver demand torque at the torque converter input decreases to fall within a range between the predetermined positive torque and a predetermined negative torque.
Claims19
A vehicle comprising:
- an engine and an electric machine coupled to a gearbox through a torque converter;
- and
- a controller programmed to, in response to a driver demand torque at an input of the torque converter decreasing to fall within a range between a predetermined positive torque and a predetermined negative torque, command an engine torque and an electric machine torque to achieve the predetermined positive torque at the input of the torque converter.
A method comprising:
- operating, by a controller, an engine and an electric machine that are coupled to a gearbox through a torque converter to cause a torque of the torque converter to achieve a predetermined positive torque at an input of the torque converter in response to a driver demand torque at the torque converter decreasing to fall within a range between the predetermined positive torque and a predetermined negative torque.
A powertrain control system comprising:
- an engine and an electric machine coupled to a gearbox through a torque converter;
- and
- a controller programmed to, responsive to a driver demand torque at the torque converter decreasing to fall within a range between an impeller stall torque of the torque converter and a predetermined negative torque, command the engine and the electric machine to cause a torque at the torque converter to be the impeller stall torque.
Dependencies are inferred from the claim text.