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Shift control device for automatic transmission

A technology of automatic transmission and control device, which is applied in the direction of transmission control, components with teeth, climate sustainability, etc., can solve problems such as speed limit on the upshift side, and achieve the effect of preventing deterioration of operating performance

Active Publication Date: 2009-04-01
JATCO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the prescribed value for judging the prohibition of shifting is set to be the same regardless of the type of shifting, the shifting on the upshift side will be restricted too much

Method used

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  • Shift control device for automatic transmission
  • Shift control device for automatic transmission
  • Shift control device for automatic transmission

Examples

Experimental program
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Embodiment Construction

[0054] Embodiments of the present invention will be described in detail below with reference to the drawings and the like.

[0055] FIG. 1 is a functional block diagram showing the configuration of a shift control device of an automatic transmission according to this embodiment. figure 2It is a block diagram showing the structure of the automatic transmission. As shown in FIG. 1 , this variable speed control device is configured to include: a controller 1, an input shaft rotational speed sensor (turbine shaft rotational speed sensor) 12 for detecting the rotational speed NT of the turbine 25 and the turbine shaft 10, and an output for detecting the rotational speed No of the output shaft 28. Shaft rotational speed sensor (vehicle speed sensor) 13, oil temperature sensor 14 for detecting the temperature of ATF (automatic transmission fluid), throttle sensor 30 for detecting the throttle opening degree of the engine not shown in the figure, and air flow sensor for detecting the ...

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PUM

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Abstract

An automatic transmission calculates a current thermal load state of the frictional element, predicts (S24, 531), prior to the start of the shift, a heat generation amount of the frictional element during the shift, predicts (S25, S32) a thermal load state of the frictional element upon shift completion on the basis of the current thermal load state and the predicted heat generation amount, and when the predicted thermal load state upon shift completion is inside a predetermined region, either performs (S28, S38) the shift after modifying a shift mode such that the heat generation amount of the frictional element is smaller than that of a case in which the predicted thermal load state upon shift completion is outside the predetermined region, or prohibits (S39) the shift, wherein the predetermined region is set at a different region depending on whether the shift is an upshift or a downshift.

Description

technical field [0001] The invention relates to a shift control device of an automatic transmission. Background technique [0002] Generally, as an automatic transmission for automobiles, it is known that the rotation of the engine is input through a torque converter, the speed is changed by a transmission mechanism having multiple sets of planetary gears, and the rotation is output to a drive shaft or propeller shaft (axle side). [0003] The transmission mechanism of this automatic transmission transmits the rotation of the input shaft (drive shaft) to a specific gear or carrier constituting the planetary gear, or transmits the rotation of a specific gear or carrier to an appropriate output shaft according to the shift position, thereby Implement variable speed. In order to properly restrict the rotation of a specific gear or carrier during gear shifting, a plurality of friction elements such as clutches and brakes are provided, and the transmission path is switched throu...

Claims

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Application Information

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IPC IPC(8): F16H61/00
CPCY02T10/60
Inventor 池田知正川上大树
Owner JATCO LTD
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