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Control apparatus and method for vehicular automatic transmission

A technology of automatic transmission and control equipment, applied in the direction of vehicle gearbox, transmission control, mechanical equipment, etc., can solve problems such as short time and achieve the effect of ensuring durability

Inactive Publication Date: 2008-08-06
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology enables continuous execution of neutral control for relatively short periods of time considering durability in the harshest environments

Method used

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  • Control apparatus and method for vehicular automatic transmission
  • Control apparatus and method for vehicular automatic transmission
  • Control apparatus and method for vehicular automatic transmission

Examples

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Embodiment Construction

[0025] In the following description and accompanying drawings, the invention will be described in more detail on the basis of exemplary embodiments.

[0026] FIG. 1 is a schematic diagram showing a driving force transmission device 10 to which a control apparatus of an automatic transmission for a vehicle according to an embodiment of the present invention can be applied. In the drawing, an output from an engine 12 as a driving force source for driving the vehicle is input to an automatic transmission 16 via a torque converter 14 as a fluid power transmission device, and then transmitted via a differential gear unit and axle shafts. to the drive wheels, which are not shown.

[0027] The engine 12 is an internal combustion engine, such as a gasoline engine, which generates driving power by combusting fuel injected into cylinders. The torque converter 14 includes a pump impeller 22 , a turbine rotor 24 and a stator 26 . The impeller 22 is coupled to the crankshaft 18 of the en...

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PUM

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Abstract

A control apparatus for a vehicular automatic transmission includes a control portion that executes a neutral control in which the control portion places the automatic transmission in a neutral state by reducing an application load on a frictional apply device inside the automatic transmission when the vehicle is stopped. The control portion ends the neutral control when a torque transmitted to the frictional apply device has been continually equal to, or greater than, a predetermined value for a consecutive predetermined of time. As a result, by considering the torque transmitted to the frictional apply device in addition to the continuation time of the neutral control, it is possible to more precisely grasp the state of the frictional apply device. In other words, it is possible to execute, as quickly as possible, neutral control for an extended period of time while ensuring durability of the frictional apply device.

Description

technical field [0001] The invention relates to a control device and method of an automatic transmission for vehicles. More specifically, the present invention relates to a technique of performing neutral control for as long as possible while ensuring durability of a frictional engagement device in an automatic transmission. Background technique [0002] A known control device of an automatic transmission for a vehicle, such as that disclosed in JP(A) 9-32917, includes a frictional engagement device and a control portion. The friction meshing device acts as an input clutch, increasing or decreasing the torque transmitted from the engine depending on whether it engages, slips, or releases. When the vehicle is stopped, the control portion places the automatic transmission in a substantially neutral state by reducing the meshing load on the frictional meshing device. This operation, called neutral control, reduces engine load, which improves fuel efficiency. [0003] However...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/20F16H61/00F16H3/66F16H59/14F16H59/72F16H61/686
CPCF16H61/686F16H2061/207F16H2342/044F16H2200/0052F16H2057/016F16H2059/147F16H61/20F16H3/666F16H2059/725F16H2200/201F16H35/10F16H59/14F16H59/72
Inventor 中屋敷诚松原亨酒井隆弘长谷川善雄田中义和
Owner TOYOTA JIDOSHA KK
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