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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, geared components, climate sustainability, etc. It can solve problems such as deterioration of running performance, achieve the effect of increasing the speed change tolerance and preventing the deterioration of running performance

Active Publication Date: 2013-03-06
JATCO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, even if the shift determined by the shift judgment is a shift that does not generate a large amount of heat and does not reach the friction element damage temperature even if the shift is performed, the shift is uniformly prohibited, so that the running performance deteriorates.

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

[0053] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and the like.

[0054] figure 1 It is a functional block diagram showing the structure of the shift control device of the automatic transmission of the present embodiment. figure 2 It is a frame diagram showing the structure of an automatic transmission. like figure 1As shown, the present transmission control device is configured to include a controller 1 , an input shaft rotational speed sensor (turbine shaft rotational speed sensor) 12 that detects rotational speeds NT of the turbine 25 and the turbine shaft 10 , and an output shaft rotational speed sensor that detects rotational speeds No of the output shaft 28 . (vehicle speed sensor) 13, oil temperature sensor 14 for detecting the temperature of ATF (automatic transmission oil), throttle sensor 30 for detecting the throttle opening degree of the engine (not shown), air flow sensor 31 for dete...

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Abstract

An automatic transmission calculates a current thermal load state of the frictional element, predicts (S24, S31), prior to the start of the shift, a heat generation amount of the frictional element if the shift is performed in the first shift mode, predicts (S25, S32) a thermal load state of the frictional element upon shift completion on the basis of the current thermal load state of the frictional element and the predicted heat generation amount, and either performs (S28, S38) the shift in a second shift mode, in which a heat generation amount is lower than that of the first shift mode, or prohibits (S39) the shift when the predicted thermal load state upon shift completion is inside a predetermined region.

Description

technical field [0001] The present invention relates to a speed change control device of an automatic transmission. Background technique [0002] In general, 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 a plurality of sets of planetary gears, and the rotation is output to a drive shaft or a propeller shaft (axle side). [0003] The speed change mechanism of this automatic transmission transmits the rotation of the input shaft (drive shaft) to a specific gear or carrier constituting the planetary gear according to the shifting position, or transmits the rotation of a specific gear or carrier to a suitable output shaft, thereby Perform a shift. A plurality of friction elements such as clutches and brakes are provided in order to appropriately restrict the rotation of a specific gear or carrier at the time of shifting, and a predetermined sh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/00
CPCY02T10/60
Inventor 池田知正川上大树
Owner JATCO LTD
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