AUTOMATIC GEAR CONTROL DEVICE

• US 20090055063A1
• Filed: 04/17/2006
• Published: 02/26/2009
• Est. Priority Date: 04/18/2005
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Minaki, Shun, Kondo, Takahiro, Nakamura, Kazuaki, Kimura, Hiromichi, Asami, Tomohiro, Oshima, Koji
• Granted Patent: US 8,046,143 B2
• Time in Patent Office: Days
• US Class Current: 701/60
• CPC Class Codes: F16H 2059/385 Turbine speed
• CPC Class Codes: F16H 2061/145 for controlling slip, e.g. approaching target slip value
• CPC Class Codes: F16H 59/14 Inputs being a function of torque or torque demand
• CPC Class Codes: F16H 59/70 dependent on the ratio established
• CPC Class Codes: F16H 61/143 using electric control means

Abstract

An ECU executes a program including: a step (S100) of detecting a turbine revolution speed, a step (S200) of detecting an engine torque TE, a step (S300) of detecting a speed change ratio, a step (S500) of setting a range an enlarged slip region when a slip region enlargement condition is satisfied (YES in S400), and a step (S600) of enlarging the slip region toward a lock-up region side (high-load side).

Claims

1. A control device of an automatic transmission formed of a multi-gear or continuously variable transmission mechanism and a torque converter with a lockup clutch arranged between said transmission mechanism and a drive source, wherein

when said lockup clutch is used in a slip region, control is performed to attain a slippage equal to the target slippage, using a learned value learned in said slip region,

said control device comprises:

a region enlarging unit enlarging said slip region to increase a frequency of learning in said slip region, and

a learning control unit learning the slippage with respect to an amount of operation in said slip region and obtaining said learned value; and

said region enlarging unit enlarges a region side of an extremely small slippage.

3. The control device of the automatic transmission according to claim 1, wherein

said control device of the automatic transmission further comprises a detecting unit detecting an output from said drive source, and

said region enlarging unit enlarges said slip region according to increase of said output.

2. (canceled)

4. A control device of an automatic transmission formed of a multi-gear or continuously variable transmission mechanism and a torque converter with a lockup clutch arranged between said transmission mechanism and a drive source, wherein

when said lockup clutch is used in a slip region, control is performed to attain a slippage equal to the target slippage, using a learned value learned in said slip region,

said control device comprises:

region enlarging means for enlarging said slip region to increase a frequency of learning in said slip region, and

learning control means for learning the slippage with respect to an amount of operation in said slip region and obtaining said learned value and

said region enlarging means includes means for enlarging a region side of an extremely small slippage.

6. The control device of the automatic transmission according to claim 4, wherein

said control device of the automatic transmission further comprises detecting means for detecting an output from said drive source, and

said region enlarging means includes means for enlarging said slip region according to increase of said output.

5. (canceled)

7. A control device of an automatic transmission formed of a multi-gear or continuously variable transmission mechanism and a torque converter with a lockup clutch arranged between said transmission mechanism and a drive source, wherein

when said lockup clutch is used in a slip region, control is performed to attain a slippage equal to the target slippage, using a learned value learned in said slip region;

said control device comprises an electronic control unit (ECU); and

said electronic control unit (ECU) enlarges said slip region toward a region side of an extremely small slippage to increase a frequency of learning in said slip region, and

obtains said learned value by learning the slippage with respect to an amount of operation in said slip region.