| US 7,497,799 B2 | ||
| Torque transmitting mechanism engagement control system and method | ||
| Bryan H. Hagelskamp, Carmel, Ind. (US); and Jeffrey E Shultz, Zionsville, Ind. (US) | ||
| Assigned to General Motors Corporation, Detroit, Mich. (US) | ||
| Filed on Jan. 27, 2006, as Appl. No. 11/341,203. | ||
| Prior Publication US 2007/0179019 A1, Aug. 02, 2007 | ||
| Int. Cl. F16H 61/06 (2006.01) | ||
| U.S. Cl. 475—128 [477/143; 477/155] | 8 Claims |
| 1. An electro-hydraulic control system for an automatically shiftable transmission comprising:
at least one variable bleed solenoid valve operable to selectively provide pressurized fluid to selectively engage at least
one torque transmitting mechanism;
an electronic control unit operable to control said at least one variable bleed solenoid valve, wherein said electronic control
unit is sufficiently programmed to control said at least one variable bleed solenoid to provide said pressurized fluid at
a high pressure level to said at least one torque transmitting mechanism for a first predetermined time and subsequently to
substantially disallow said pressurized fluid to said at least one torque transmitting mechanism for a second predetermined
time subsequent to said first predetermined time;
a main source of pressurized fluid wherein said main source of pressurized fluid provides said pressurized fluid to said at
least one variable bleed solenoid valve; and
wherein said electronic control unit is sufficiently programmed to determine a time required to stabilize said main source
of pressurized fluid after said first predetermined time and to substantially equate said time required to stabilize said
main source of pressurized fluid to said second predetermined time.
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