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Shift control device and shift control method of vehicular automatic transmission

An automatic transmission and control device technology, applied in transmission control, components with teeth, climate sustainability, etc., can solve problems such as large speed difference and speed change shock, and achieve good responsiveness and reduce speed change shock.

Inactive Publication Date: 2007-06-13
TOYOTA JIDOSHA KK
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  • Application Information

AI Technical Summary

Problems solved by technology

That is, a situation where the input rotational speed of the automatic transmission rises during the shift waiting control so that there is a large differential rotational speed (rotational speed difference) between the input rotational speed and the synchronous rotational speed of the shift target gear of the coast downshift and thereafter does not exist In the case where the driver intends to decelerate the vehicle and the shift waiting control is released and the coasting downshift continues, there is a possibility of a large shift shock due to a large difference in the rotational speed

Method used

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  • Shift control device and shift control method of vehicular automatic transmission
  • Shift control device and shift control method of vehicular automatic transmission
  • Shift control device and shift control method of vehicular automatic transmission

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no. 1 approach

[0083] According to the first embodiment, the speed change control device includes: a deceleration intention judging device 102 (S2), which judges whether there is an intention of the driver to decelerate the vehicle during the coasting downshift; a shift waiting device 104 (S5), if the deceleration intention judgment Means 102 make affirmative judgment, then this gear shift waiting means 104 stops raising the engagement pressure of engaging side engagement element, thereby makes gear shifting no longer proceed; If the deceleration intention judging means 102 makes a negative determination during increasing the engagement pressure, the shift continuation means 106 again raises the engagement pressure of the engagement side engagement element, thereby allowing the shift to continue. Therefore, if there is the driver's intention to decelerate the vehicle, that is, if it is considered that there is an intention to change from the deceleration state to the stop state, the shift con...

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Abstract

In a shift control device and a shift control method of a vehicular automatic transmission that performs a coast downshift by engagement switch between a release-side engagement element and an element-side engagement element at a time of deceleration of a vehicle, it is determined whether or not there is a driver's intention to decelerate the vehicle during the coast downshift. If an affirmative determination is made regarding the intention to decelerate the vehicle, the rise of engagement pressure of the engagement-side engagement element is stopped so as to cause the coast downshift not to progress. If a negative determination is made regarding the intention to decelerate the vehicle while the rise of the engagement pressure has been stopped, the engagement pressure of the engagement-side engagement element is raised again so as to cause the coast downshift to progress.

Description

technical field [0001] The present invention relates to a gear shift control device and a gear shift control method of an automatic transmission for a vehicle that forms a plurality of gear positions with different gear ratios by selectively engaging a plurality of engaging elements. More particularly, the present invention relates to a technique for reducing shift shock of downshifting (coast downshift) during deceleration running (coasting) of a vehicle. Background technique [0002] For a vehicle automatic transmission that forms a plurality of gears with different gear ratios by selectively engaging a plurality of engaging elements (engaging devices), there is a known technique that allows the vehicle to accelerate again from a deceleration state At this time, the vehicle can accelerate well with appropriate driving power (responsiveness). In this technique, during deceleration of the vehicle, a coast downshift is performed in preparation for depressing the accelerator ...

Claims

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Application Information

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IPC IPC(8): F16H61/04F16H61/16
CPCY02T10/60
Inventor 近藤智敬高波阳二绫部笃志近藤真美田中雅晴
Owner TOYOTA JIDOSHA KK
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