Method and apparatus for engine torque cancellation in a powertrain system
AssigneeGM Global Technology Operations LLC
InventorsBrian L. Spohn, Michael William Roblin
Life of this patent
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Abstract
A powertrain system includes an internal combustion engine rotatably coupled via an input member to a transmission. The transmission has a hydraulic circuit including a hydraulic fluid pump directly mechanically coupled to the input member. A computer-implemented method for operating the powertrain system includes, in response to a command to execute an engine autostop maneuver, determining an engine speed ramping profile to achieve a desired stopped engine position. Hydraulic pressure in the hydraulic circuit is controlled in response to the engine speed ramping profile and engine speed during said engine autostop maneuver.
Claims20
Computer-implemented method for operating a powertrain system including an internal combustion engine rotatably coupled via an input member to a transmission, said transmission comprising a hydraulic circuit including a hydraulic fluid pump directly mechanically coupled to the input member, the method comprising:
- in response to a command to execute an engine autostop maneuver:
- determining an engine speed ramping profile to achieve a desired stopped engine position;
- and
- controlling hydraulic pressure in the hydraulic circuit responsive to the engine speed ramping profile and engine speed during said engine autostop maneuver.
Computer-implemented method for executing an engine autostop maneuver in a powertrain system including an internal combustion engine rotatably coupled via an input member to a transmission, the method comprising:
- determining an engine speed ramping profile to achieve a desired stopped engine position;
- and
- controlling hydraulic pressure in a hydraulic circuit of the transmission responsive to the engine speed ramping profile and an engine speed.
Dependencies are inferred from the claim text.