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System and method for double transition shifting in a transmission

A transmission and gear technology, applied in the field of automatic transmission, can solve the problem that the clutch cannot provide reaction torque, etc.

Active Publication Date: 2017-01-11
GM GLOBAL TECH OPERATIONS LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if one of the clutches participating in the shift has a slip direction in the current gear and an opposite torque direction (that is, the direction the clutch is carrying torque) in the commanded gear, or a slip direction in the current gear torque direction, with an opposite slip direction in the commanded gear, the clutch cannot provide reactive torque during the shift and still allow the desired output torque and input acceleration during the shift

Method used

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  • System and method for double transition shifting in a transmission
  • System and method for double transition shifting in a transmission
  • System and method for double transition shifting in a transmission

Examples

Experimental program
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Embodiment Construction

[0024] Referring to the drawings, wherein like reference numerals refer to like parts, figure 1 The portion of the transmission system 10 is shown including an automatic transmission 12 having a plurality of selectively engageable clutches C1, C2, C3, C4, C5 and C6 that can be engaged in different Eleven different forward gear ratios and one reverse gear ratio are established between 14 and output member 16. The input member 14 receives drive torque from an engine, not shown, and the output member 16 provides torque to wheels (not shown) through a final drive, as understood by those skilled in the art.

[0025] The clutch engagement schemes used to establish the various gear ratios are shown in Table 1. An "X" indicates that the clutch is engaged and carrying torque.

[0026] Table 1

[0027]

[0028] The transmission 12 includes a gear arrangement having four planetary gear sets 20 , 30 , 40 and 50 . Each planetary gear set 20, 30, 40, 50 has a corresponding sun gear m...

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PUM

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Abstract

A method of performing a double transition shift in a transmission includes determining, by a controller, that one of four clutches participating in the shift has a relative direction of rotation of an input member in one of a current gear and a commanded gear. A clutch slip direction and an opposite clutch torque direction relative to an input member torque direction in the other of the current gear and the commanded gear. The controller then calculates clutch torques for at least some of the off clutches and at least some of the oncoming clutches, and controls the torque at the off and on clutches during shifts based on the calculated clutch torques to ensure opposite slip and torque direction clutches do not provide reactive torque during a shift unless there is zero clutch slip across said one of the four clutches, or in the clutch torque direction.

Description

technical field [0001] The present invention generally includes automatic transmissions and control methods for implementing double transition shifts in the transmissions. Background technique [0002] Automatic transmissions have a plurality of selectively engageable clutches that can be engaged in different combinations to establish a plurality of different gears with different ratios of input member torque to input member torque. The controller may command the transmission to shift between different gears in response to driver input, or in response to vehicle operating conditions, such as vehicle speed, input or output torque, and other conditions. [0003] Some transmissions can be configured so that shifts between two gears are double transition shifts. A double transition shift requires two clutches engaged in the current gear to be disengaged in the commanded gear, and two other clutches not engaged in the current gear to be engaged in the commanded gear. These clut...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H59/02F16D48/00
CPCF16H61/04F16H61/68F16H2061/0425F16D2500/30406F16D2500/3165F16D2500/50287F16D2500/50661F16D2500/7044F16D48/06
Inventor V.A.尼拉坎坦N.E.维尔克
Owner GM GLOBAL TECH OPERATIONS LLC