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Gear-reducing controller for automatic vehicle gear shift and controlling method thereof

A technology of automatic transmission and control device, applied in transmission, gear transmission, transmission control, etc., can solve the problems of insufficient engagement torque of hydraulic friction engagement device, hindering smooth reception of engagement torque, vibration, etc., to avoid Insufficient engagement torque, stable turbo torque, and anti-vibration effects

Inactive Publication Date: 2004-04-07
TOYOTA JIDOSHA KK +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if the value of the throttle opening is set to correspond to the accelerator operation amount while slowing down the end of the throttle opening control, there is a risk that the engagement torque of the hydraulic friction engagement device will be insufficient, thereby causing a clutch-to-clutch downshift. prevents the smooth reception of the engagement torque, causing vibration

Method used

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  • Gear-reducing controller for automatic vehicle gear shift and controlling method thereof
  • Gear-reducing controller for automatic vehicle gear shift and controlling method thereof
  • Gear-reducing controller for automatic vehicle gear shift and controlling method thereof

Examples

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Embodiment Construction

[0022] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

[0023] FIG. 1 is a schematic diagram of a transverse vehicle drive device for a FF (Front Engine Front Drive) vehicle. The vehicle driving device is configured such that the output of an engine 10 composed of an internal combustion engine, such as a gasoline engine, etc. is driven by a drive including a torque converter 12, an automatic transmission 14, a differential gear device (differential) 16, etc. The force transmission is transmitted to the drive wheels (front wheels (not shown)). The torque converter 12 includes a pump wheel 20 connected to the crankshaft 18 of the engine 10, a turbine 24 connected to the input shaft 22 of the automatic transmission 14, and a one-way clutch 26 fixed on a housing 28 (non-rotating Components) on the stator 30 and a lock-up clutch 32 that directly couples the crankshaft 18 and the input shaft 22 via a buffer (not ...

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PUM

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Abstract

In a vehicle in which a moderate throttle opening degree control of maintaining a degree of throttle opening that is less than a degree of throttle opening that corresponds to an accelerator operation is performed for a predetermined period following a beginning of the accelerator operation, if it is determined that a clutch-to-clutch downshift judgment has been made, the reduction of the engaging pressure of a disengage-side friction engagement device is restrained until it is determined that the moderate throttle opening degree control has ended. Therefore, even if the turbine torque is returned to a normal value at the end of the moderate throttle opening degree control, insufficient engaging torque is avoided, and the takeover of engaging torque for the clutch-to-clutch downshift is smoothly performed while the turbine torque is stable. Hence, occurrence of a shock related to the end of the moderate throttle opening degree control is suitably prevented.

Description

technical field [0001] The present invention relates to a downshift control device and a control method of a vehicle automatic transmission, which are used to properly prevent the occurrence of vibration (shock) caused by downshifting during vehicle accelerator operation. Background technique [0002] For example, Japanese Patent Application Laid-Open No. 9-229176 proposes a shift control device that operates as follows when downshifting, such as clutch-to-clutch downshift, in which the reduction-disengagement (disengagement The engagement pressure of the hydraulic friction engagement device on the ) side temporarily increases the engagement pressure of the hydraulic friction engagement device on the one engagement side. The shift control device determines whether the current downshift is a downshift that requires a temporary increase in the engine speed to achieve a constant speed downshift. This device changes the content of the control to increase the engagement pressure...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60W10/04B60W10/06B60W10/10B60W10/11F16H3/66F16H59/24F16H59/42F16H61/04F16H61/06F16H61/08F16H63/50
CPCF16H3/66F16H63/502F16H61/061F16H3/64F16H61/04
Inventor 佐藤利光野本久德坂本尚之杉村敏夫木村弘道原田吉晴柴田昇
Owner TOYOTA JIDOSHA KK
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