| US 7,582,041 B2 | ||
| Controller for continuously variable transmission | ||
| Yuji Suzuki, Kariya Aichi (Japan); Takashi Ohta, Chikushino Fukuoka (Japan); Yosuke Hanai, Tokyo (Japan); and Hiroshi Izumi, Tokyo (Japan) | ||
| Assigned to Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Apr. 13, 2006, as Appl. No. 11/402,805. | ||
| Claims priority of application No. 2005-117065 (JP), filed on Apr. 14, 2005. | ||
| Prior Publication US 2006/0235596 A1, Oct. 19, 2006 | ||
| Int. Cl. B60K 31/00 (2006.01); F16H 9/00 (2006.01) | ||
| U.S. Cl. 477—42 | 16 Claims |
| 1. A controller for a continuously variable transmission mounted in a vehicle which has an engine and a cruise control system
for maintaining a target vehicle speed, said controller comprising:
basic speed ratio setting means for setting a basic speed ratio of said continuously variable transmission based on said target
vehicle speed;
adjustment speed ratio setting means for sequentially setting an adjustment speed ratio of said continuously variable transmission
based on a target torque interrelated value which is a value interrelated with a target torque of said engine; and
speed ratio control means for controlling said continuously variable transmission so that an actual speed ratio of said continuously
variable transmission becomes equal to a target speed ratio obtained by adding said adjustment speed ratio set by said adjustment
speed ratio setting means to said basic speed ratio set by said basic speed ratio setting means;
wherein said adjustment speed ratio setting means comprises
adjustment speed ratio increasing means for progressively increasing said adjustment speed ratio according to an increase
in said target torque interrelated value only when said target torque interrelated value is increased and when an operating
point determined by said target torque interrelated value and adjustment speed ratio is present on a first operating area,
and
adjustment speed ratio decreasing means for progressively decreasing said adjustment speed ratio according to a decrease in
said target torque interrelated value only when said target torque interrelated value is decreased and when said operating
point is present on a second operating area;
and wherein, when said operating point is present within a third operating area between said first operating area and said
second operating area, said adjustment speed ratio setting means maintains said adjustment speed ratio that is set finally.
|