Reducing torque disturbances and improving fuel economy in hybrid electric powertrains
First Claim
1. A method of transitioning between activated and deactivated modes in a hybrid powertrain driven by a displacement on demand engine and an electric machine, comprising:
- calculating a desired powertrain torque;
determining a maximum electric machine torque output;
reducing an engine torque output by said maximum electric machine torque output;
increasing an electric machine torque output to achieve said desired powertrain torque;
deactivating cylinders of said engine, and;
increasing said engine torque output and reducing said electric machine torque output to maintain said desired powertrain torque after said step of deactivating cylinders of said engine.
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Accused Products
Abstract
An engine control system for controlling transitions between activated and deactivated modes in a hybrid powertrain driven by a displacement on demand engine and an electric machine includes a calculator that calculates a desired powertrain torque. An engine control controls operation of the engine to produce an engine torque. An electric machine control controls operation of the electric machine to produce an electric machine torque. The electric machine torque supplements the engine torque to achieve the desired powertrain torque during a transition from the activated mode to the deactivated mode.
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Citations
13 Claims
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1. A method of transitioning between activated and deactivated modes in a hybrid powertrain driven by a displacement on demand engine and an electric machine, comprising:
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calculating a desired powertrain torque; determining a maximum electric machine torque output; reducing an engine torque output by said maximum electric machine torque output; increasing an electric machine torque output to achieve said desired powertrain torque; deactivating cylinders of said engine, and; increasing said engine torque output and reducing said electric machine torque output to maintain said desired powertrain torque after said step of deactivating cylinders of said engine. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of reducing torque disturbances when transitioning between activated and deactivated modes in a hybrid powertrain driven by a displacement on demand engine and an electric machine, comprising:
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calculating a desired powertrain torque; activating said cylinders of said engine; calculating an excess torque output of said engine; operating said electric machine to absorb at least a portion of said excess torque output; determining a maximum electric machine torque output; reducing an engine torque output by said maximum electric machine torque output; increasing an electric machine torque output to achieve said desired powertrain torque; deactivating cylinders of said engine; and increasing said engine torque output and reducing said electric machine torque output to maintain said desired powertrain torque after said step of deactivating cylinders of said engine. - View Dependent Claims (12, 13)
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Specification