| US 7,530,413 B2 | ||
| Reducing torque disturbances and improving fuel economy in hybrid electric powertrains | ||
| Allen B. Rayl, Waterford, Mich. (US) | ||
| Assigned to General Motors Corporation, Detroit, Mich. (US) | ||
| Filed on Aug. 13, 2004, as Appl. No. 10/918,620. | ||
| Prior Publication US 2006/0032684 A1, Feb. 16, 2006 | ||
| Int. Cl. B60W 20/00 (2006.01) | ||
| U.S. Cl. 180—65.2 [701/48; 903/930] | 13 Claims |
| 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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