Method and apparatus for determination of fast actuating engine torque for a hybrid powertrain system
First Claim
1. Method for controlling an engine coupled to an input member of a hybrid transmission, the hybrid transmission operative to transfer torque between the input member and a torque machine and an output member to generate an output torque in response to an operator torque request, and the torque machine connected to an energy storage device, the method comprising:
- determining a preferred input torque from the engine to the hybrid transmission based upon operator inputs to an accelerator pedal and a brake pedal;
determining maximum and minimum allowable input torques from the engine to the hybrid transmission;
controlling the engine at the preferred input torque when the preferred input torque is within the maximum and minimum allowable input torques;
controlling the engine based upon the maximum and minimum allowable input torques when the preferred input torque is outside one of the maximum and minimum allowable input torques;
determining a decrease in the maximum allowable input torque;
selectively controlling combustion timing to decrease the input torque based upon the determined decrease in the maximum allowable input torque;
determining a rate of decrease in the maximum allowable input torque;
controlling combustion timing based upon the determined rate of decrease when the maximum allowable input torque exceeds the preferred input torque; and
adjusting a position of an engine throttle when the determined rate of decrease in the maximum allowable input torque is less than a threshold rate.
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0 Petitions
Accused Products
Abstract
An engine is coupled to an input member of a hybrid transmission and the hybrid transmission is operative to transfer torque between the input member and a torque machine and an output member to generate an output torque in response to an operator torque request. The torque machine is connected to an energy storage device. A method for controlling the engine includes determining a preferred input torque from the engine to the hybrid transmission based upon operator inputs to an accelerator pedal and a brake pedal, determining maximum and minimum allowable input torques from the engine to the hybrid transmission, controlling the engine at the preferred input torque when the preferred input torque is within the maximum and minimum allowable input torques, and controlling the engine based upon the maximum and minimum allowable input torques when the preferred input torque is outside one of the maximum and minimum allowable input torques.
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Citations
11 Claims
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1. Method for controlling an engine coupled to an input member of a hybrid transmission, the hybrid transmission operative to transfer torque between the input member and a torque machine and an output member to generate an output torque in response to an operator torque request, and the torque machine connected to an energy storage device, the method comprising:
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determining a preferred input torque from the engine to the hybrid transmission based upon operator inputs to an accelerator pedal and a brake pedal; determining maximum and minimum allowable input torques from the engine to the hybrid transmission; controlling the engine at the preferred input torque when the preferred input torque is within the maximum and minimum allowable input torques; controlling the engine based upon the maximum and minimum allowable input torques when the preferred input torque is outside one of the maximum and minimum allowable input torques; determining a decrease in the maximum allowable input torque; selectively controlling combustion timing to decrease the input torque based upon the determined decrease in the maximum allowable input torque; determining a rate of decrease in the maximum allowable input torque; controlling combustion timing based upon the determined rate of decrease when the maximum allowable input torque exceeds the preferred input torque; and adjusting a position of an engine throttle when the determined rate of decrease in the maximum allowable input torque is less than a threshold rate. - View Dependent Claims (2, 3, 4, 5)
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6. Method for controlling an engine coupled to an input member of a hybrid transmission, the hybrid transmission operative to transfer torque between the input member and a torque machine and an output member to generate an output torque in response to an operator torque request, the method comprising:
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determining a preferred input torque from the engine to the hybrid transmission; determining an input torque constraint based upon a capacity of the hybrid transmission to react input torque from the engine; determining a rate of change in the input torque constraint; and controlling engine operation to adjust the preferred input torque when the determined rate of change in the input torque constraint is greater than a threshold, comprising adjusting combustion timing based upon the rate of change in the input torque constraint when a maximum allowable input torque exceeds the preferred input torque, and adjusting a position of an engine throttle when the determined rate of change in the input torque constraint is less than a threshold rate. - View Dependent Claims (7, 8, 9)
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10. Method for controlling an engine coupled to an input member of a hybrid transmission, the hybrid transmission operative to transfer torque between the input member and a torque machine and an output member to generate an output torque in response to an operator torque request, and the torque machine connected to an energy storage device, the method comprising:
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determining a preferred input torque from the engine to the hybrid transmission based upon operator inputs to an accelerator pedal and a brake pedal; determining maximum and minimum allowable input torques from the engine to the hybrid transmission; controlling the engine at the preferred input torque when the preferred input torque is within the maximum and minimum allowable input torques; controlling the engine based upon the maximum and minimum allowable input torques when the preferred input torque is outside one of the maximum and minimum allowable input torques; determining a first rate of decrease in the maximum allowable input torque; adjusting a position of an engine throttle to decrease the input torque based upon the first rate of decrease; determining a second rate of decrease in the maximum allowable input torque when adjusting the position of the engine throttle; and retarding spark to decrease input torque based upon the second rate of decrease.
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11. Method for controlling an engine coupled to an input member of a hybrid transmission, the hybrid transmission operative to transfer torque between the input member and a torque machine and an output member to generate an output torque in response to an operator torque request, the method comprising:
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determining a preferred input torque from the engine to the hybrid transmission; determining an input torque constraint based upon a capacity of the hybrid transmission to react input torque from the engine and the output torque responsive to the operator torque request; determining a rate of change in the input torque constraint; and controlling engine operation to adjust the preferred input torque when the determined rate of change in the input torque constraint is greater than a threshold, comprising adjusting combustion timing based upon the rate of change in the input torque constraint when a maximum allowable input torque exceeds the preferred input torque, and adjusting a position of an engine throttle when the determined rate of change in the input torque constraint is less than a threshold rate.
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Specification