| US 7,349,785 B2 | ||
| Method of controlling clutch slip during gear shifts of an automatic transmission | ||
| Chunhao J. Lee, Troy, Mich. (US); Kumaraswamy V. Hebbale, Troy, Mich. (US); Chi-Kuan Kao, Troy, Mich. (US); Farzad Samie, Franklin, Mich. (US); and Richard W. Carlson, Warren, Mich. (US) | ||
| Assigned to General Motors Corporation, Detroit, Mich. (US) | ||
| Filed on Mar. 31, 2004, as Appl. No. 10/813,898. | ||
| Prior Publication US 2005/0222736 A1, Oct. 06, 2005 | ||
| Int. Cl. G06F 19/00 (2006.01); B60W 10/02 (2006.01) | ||
| U.S. Cl. 701—67 [701/51; 477/34; 477/39; 477/70; 477/90] | 18 Claims |
| 1. A method of controlling engagement of a clutch which carries torque before, during and after a shifting event in a transmission
which is connected to an engine, the method comprising:
providing a feed-forward input command which increases as the engine torque increases, and decreases as the engine torque
decreases;
providing a feedback input command which is a function of an error value equaling a calculated difference between a measured
clutch slip and a reference slip profile; and
summing said feed-forward input command and said feedback input command to provide a clutch control command for controlling
engagement of the clutch before, during and after the shifting event to allow a desired amount of clutch slip to damp excitation
of the transmission.
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