METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE FOR A HYBRID POWERTRAIN SYSTEM
First Claim
1. A method for operating a hybrid powertrain system including an internal combustion engine operatively connected to a second torque machine to transmit torque to an output member, the method comprising:
- monitoring an operator torque request;
determining an output torque command based upon the operator torque request;
commanding a transition between an engine-off state and an engine-on state;
monitoring an engine crank angle;
spinning the engine unfueled;
estimating cylinder pressure based upon the engine crank angle during the spinning of the engine;
predicting a cylinder pulse torque based upon the cylinder pressure;
determining a cancellation torque for the second torque machine based upon the predicted cylinder pulse torque; and
controlling motor torque output from the second torque machine based upon the cancellation torque and the output torque command.
18 Assignments
0 Petitions
Accused Products
Abstract
A hybrid powertrain system includes an internal combustion engine operatively connected to a second torque machine to transmit torque to an output member. A method for operating the hybrid powertrain system includes monitoring an operator torque request, determining an output torque command based upon the operator torque request, commanding a transition between an engine-off state and an engine-on state, monitoring an engine crank angle, spinning the engine unfueled, estimating cylinder pressure based upon the engine crank angle during the spinning of the engine, predicting a cylinder pulse torque based upon the cylinder pressure, determining a cancellation torque for the second torque machine based upon the predicted cylinder pulse torque, and controlling motor torque output from the second torque machine based upon the cancellation torque and the output torque command.
182 Citations
21 Claims
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1. A method for operating a hybrid powertrain system including an internal combustion engine operatively connected to a second torque machine to transmit torque to an output member, the method comprising:
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monitoring an operator torque request; determining an output torque command based upon the operator torque request; commanding a transition between an engine-off state and an engine-on state; monitoring an engine crank angle; spinning the engine unfueled; estimating cylinder pressure based upon the engine crank angle during the spinning of the engine; predicting a cylinder pulse torque based upon the cylinder pressure; determining a cancellation torque for the second torque machine based upon the predicted cylinder pulse torque; and controlling motor torque output from the second torque machine based upon the cancellation torque and the output torque command. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for operating a hybrid powertrain system including an internal combustion engine operatively connected to a first and second torque machines to transmit torque to an output member, the method comprising:
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monitoring an operator torque request; determining an output torque command based upon the operator torque request; commanding a transition between an engine-off state and an engine-on state; monitoring an engine crank angle; operating one of the torque machines to spin the engine unfueled; estimating cylinder pressure based upon the engine crank angle during the spinning of the engine; predicting a cylinder pulse torque based upon the cylinder pressure; determining cancellation torques for the first and second torque machines based upon the predicted cylinder pulse torque and the output torque command; and controlling the motor torque outputs of the first and second torque machines based upon the cancellation torque and the output torque command. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for operating a hybrid powertrain system including an internal combustion engine operatively connected to a plurality of torque machines to transmit torque to an output member, the method comprising:
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monitoring an operator torque request; determining an output torque command based upon the operator torque request; commanding a transition between an engine-off state and an engine-on state; monitoring an engine crank angle; operating one of the torque machines to spin the engine unfueled and controlling motor torques from the torque machines based upon the output torque command; estimating cylinder pressure based upon the engine crank angle during the spinning of the engine; predicting a cylinder pulse torque based upon the cylinder pressure; determining cancellation torques for the first and second torque machines based upon the predicted cylinder pulse torque and the output torque command; and controlling the motor torque outputs of the torque machines based upon the cancellation torque and the output torque command. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification