Apparatus and method for active driveline damping with clunk control
AssigneeGeneral Motors Corporation
InventorsRobert L. Morris, Kevin S. Kidston, Richard C. Peterson
Life of this patent
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Abstract
A propulsion system designed for hybrid vehicles utilizing a first torque path from a coupled motor generator system and internal combustion engine through and automatically shifted manual transmission having a secondary torque path from a secondary torque source to the wheels. The system incorporates the high-efficiency of a manual transmission with the smoothness of the most advanced automatic transmissions by utilizing a second torque path to maintain driver requested torque during shifts and braking requests.
Claims22
A method for controlling a torque in a driveline of a hybrid vehicle, comprising:
- a) controlling the torque applied to an input shaft of a transmission of said vehicle;
- b) differentiating a twist angle trajectory of said input shaft;
- c) adding said twist angle trajectory to a measured output shaft speed of said input shaft;
- d) scaling said twist angle trajectory and said measured output shaft speed;
- e) determining a desired input shaft speed trajectory;
- f) determining a speed target of said input shaft, said speed target causing a lash of said input shaft to be taken up with little impact;
- and
- g) applying the torque to said input shaft.
A method for controlling a transmission of a hybrid vehicle during the shifting of the gears of the transmission comprising:
- calculating a change in speed of an output shaft of the transmission due to a gear shifting request, the transmission receiving a driving force from a first drive and/or a second drive;
- calculating a phase compensated change in speed from said change in speed;
- calculating a damping torque from said phase compensated change in speed;
- and
- controlling one of said first or second drives to apply said damping torque to an input shaft of the transmission to provide a damping compensation during the shifting of gears.
A method of controlling a transmission of a hybrid vehicle upon the application of a torque request on the transmission comprising:
- determining a lash condition of an axel that is driven by the transmission as a result of the torque request, said lash condition being defined in a range by a first lash state and a second lash state;
- applying a compensating torque to an input shaft of the transmission when said lash condition is in said first lash state;
- and
- controlling a speed of said input shaft to a target speed when said lash condition is in said second lash state.
Dependencies are inferred from the claim text.