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Line pressure control apparatus and line pressure control method for automatic transmission

By designing a pipeline pressure control device in the automatic transmission to dynamically adjust the pipeline pressure, the problem of shift shock during lock-up clutch slip control is solved, and fuel efficiency and smoothness of power transmission are improved.

Inactive Publication Date: 2007-06-27
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, Japanese Patent Application Publication No. JP-A-5-118417 does not describe the line pressure for performing the slip control of the lock-up clutch

Method used

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Examples

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Embodiment Construction

[0024] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same components are denoted by the same reference numerals, and have the same names and the same functions. Therefore, a detailed description thereof will not be repeated.

[0025] A vehicle equipped with a control device according to an embodiment of the present invention will be described with reference to FIG. 1 . The vehicle is a front engine front drive vehicle. The control device according to the embodiment can also be mounted on vehicles other than front-engine front-drive vehicles.

[0026] The vehicle includes an engine 1000, an automatic transmission 2000, a planetary gear unit 3000 constituting a part of the automatic transmission 2000, a hydraulic circuit 4000 constituting a part of the automatic transmission 2000; a differential gear 5000; a drive shaft 6000; front wheels 7000; control unit) 8000.

[0027] Engine 1000 is ...

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Abstract

An ECU executes a program that includes the steps of setting a line pressure to a line pressure ( 1 ) that is appropriate for improving fuel efficiency, if an automatic transmission is not shifting, and a deceleration slip control for a lock-up clutch is not being executed; setting the line pressure to a line pressure ( 2 ) that is equal to or lower than a line pressure ( 3 ) that is appropriate when the automatic transmission is shifting, if it is determined that the automatic transmission is not shifting, and the deceleration slip control is being executed; and setting the line pressure to the line pressure ( 3 ), if it is determined that the automatic transmission is shifting. The line pressure ( 1 ) is lower than the line pressure ( 2 ). The line pressure ( 2 ) is equal to or lower than the line pressure ( 3 ).

Description

technical field [0001] The invention relates to a line pressure control device and a line pressure control method for an automatic transmission. More particularly, the present invention relates to an apparatus and method for controlling line pressure when slip control of a lock-up clutch is being performed. Background technique [0002] Generally, an automatic transmission includes a torque converter and a gear train. A power transmission path is switched in a gear transmission mechanism by selectively operating a plurality of friction-fit elements such as clutches and brakes to automatically select a predetermined gear ratio. A hydraulic circuit is provided in such an automatic transmission to control supply / discharge of hydraulic pressure to / from actuators for frictional engagement elements. More specifically, regulator valves and various other valves such as manual valves and shift valves are provided in the hydraulic circuit. The regulator valve regulates the hydrauli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/00F16H61/14
CPCF16H61/0021F16H61/14F16H2059/465F16H61/00F16H61/46
Owner TOYOTA JIDOSHA KK
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