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

A technology for automatic transmission and shift control, which is applied in the direction of control devices, transmission devices, fluid transmission devices, etc., and can solve problems such as shift shock, fuel efficiency decline, and shift time delay

Inactive Publication Date: 2004-06-16
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This drop and liter of engine speed causes shift shock (vibration) or delay of shift time
Also, if the engine RPM drop is large enough to require refueling, fuel efficiency will drop

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

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] In the following description and in the drawings, the invention is described in detail with reference to exemplary embodiments.

[0041]FIG. 1 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 stator 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 gear pump is c...

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Abstract

Since the engaging pressure of a hydraulic frictional engaging device operated due to the clutch-to-clutch down gear change is corrected by learning control by a learning control means 144 so that the drop amount of the input shaft rotation speed NINis small based on a situation where, at the time of clutch-to-clutch down gear change during the deceleration running, the drop amount NUSMAXof the input shaft rotation speed NIN(turbine rotation speed NT) of the automatic transmission 14 exceeds a predetermined value (target under shoot amount NUSU), at the time of clutch-to-clutch down gear change during the deceleration running, the drop of the engine rotation speed NEis automatically suppressed, and gear change shock caused by the drop and delay of the gear change time are appropriately eliminated.

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 Applications(China)
IPC IPC(8): B60W10/06B60W30/18F16H61/00F16H61/04F16H61/06
CPCB60W2710/0616B60W10/115F16H61/686B60K2741/065Y02T10/76B60W10/06B60W2520/105F16H2061/0087F16H2306/44B60W30/18B60W2510/0638F16H61/061F16H2306/52B60W10/04B60W10/11B60W30/1819
Inventor 绫部笃志杉村敏夫
Owner TOYOTA JIDOSHA KK
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