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Shift control apparatus and shift control method for a vehicular automatic transmission

A technology of automatic transmission and shift control, applied in the direction of transmission control, components with teeth, belts/chains/gears, etc., can solve problems such as shift shocks, and achieve the effect of eliminating shift shocks

Inactive Publication Date: 2006-12-27
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But doing so can cause shift shock with little or no drop in engine speed

Method used

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  • Shift control apparatus and shift control method for a vehicular automatic transmission
  • Shift control apparatus and shift control method for a vehicular automatic transmission
  • Shift control apparatus and shift control method for a vehicular automatic transmission

Examples

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Embodiment Construction

[0034] In the following description and in the drawings, the invention is described in detail with reference to exemplary embodiments.

[0035] figure 1It is a schematic diagram of a transverse vehicle drive device of a vehicle such as a FF (Front Engine Front Drive) vehicle. One is an internal combustion engine such as a gasoline engine, and the output of the engine 10 is transmitted to the drive wheels (front wheels) through a power transmission device such as a torque converter 12, an automatic transmission 14 and a differential gear device (differential) 16. 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 fixed on a housing 28 as a non-rotating member via a one-way clutch 26. The guide wheel 30 and the lock-up clutch 32 directly connect the crankshaft 18 and the input shaft 22 via a buffer (not shown). A mechanical oil pump 21 such as a gea...

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PUM

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Abstract

A shift control apparatus for a vehicular automatic transmission provided with a fuel cut apparatus which cuts off fuel supplied to an engine when an engine speed exceeds a predetermined value during deceleration of a vehicle, and an automatic transmission in which a gearshift is achieved with a clutch-to-clutch downshift in which a hydraulic friction device to be released is released and a hydraulic friction device to be applied is applied, further includes a controller. The controller corrects, through learning control, an apply pressure of at least one of the hydraulic friction devices to be operated for the clutch-to-clutch downshift such that an amount of drop in a rotational speed of an input shaft of the automatic transmission increases when that amount of drop is less than a predetermined value during the clutch-to-clutch downshift.

Description

technical field [0001] The present invention relates to a shifting (shifting) control device and shifting control of a vehicle automatic transmission capable of suppressing a decrease in the rotational speed of an input shaft during a clutch-to-clutch downshift when the vehicle is decelerating method. Background technique [0002] A known shift control device for an automatic transmission for a vehicle is that it performs shift hydraulic control during a clutch-to-clutch downshift to reduce a disengagement-side hydraulic friction engagement engaged for a predetermined rotational speed before shifting The engagement pressure of the device is simultaneously increased to realize the engagement pressure of the hydraulic friction engagement device on the engagement side at a predetermined speed after shifting. For example, according to JP(A) 11-287318, in the clutch-to-clutch downshift, the engagement pressure of the hydraulic friction engagement device on the engagement side is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/08F16H61/06
CPCF16H61/061F16H2061/0496F16H2306/52F16H2306/44
Inventor 绫部笃志杉村敏夫
Owner TOYOTA JIDOSHA KK
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