US 2015/0308568 A1Published application

Oil pressure control device for automatic transmission

AssigneesToyota Jidosha Kabushiki Kaisha, Aisin Aw Co., Ltd.

InventorsHideharu NOHARA, Toshio SUGIMURA, Tooru MATSUBARA, Koichi OKUDA, Kota FUJII, Kazuyuki NODA, Kousuke TANAKA

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Abstract

When a user performs an operation to switch from a forward range to a reverse range, an ECU switches an oil passage (referred to hereafter as a “B2 pressure supply source oil passage”), through which oil pressure is supplied to a brake, from a first oil passage to a second oil passage while engaging the same brake. At this time, in consideration of a response delay in the oil pressure in the second oil passage, the ECU switches the B2 pressure supply source oil passage from the first oil passage to the second oil passage after a predetermined time α elapses from the point at which the user performs the forward-reverse switch operation (in other words, after waiting for the oil pressure in the second oil passage to reach a threshold pressure) rather than at the point at which the user performs the forward-reverse switch operation.

Claims6

Dependent claims

An oil pressure control device for an automatic transmission, the automatic transmission including

an engagement element configured to be engaged by application of oil pressure that is equal to or larger than a predetermined pressure in any case where a control condition of the automatic transmission is a first condition or a second condition,
a first oil passage configured to supply the oil pressure to the engagement element when the control condition of the automatic transmission is the first condition,
a second oil passage configured to supply the oil pressure to the engagement element when the control condition of the automatic transmission is the second condition, and
a switch device configured to switch an oil passage, through which the oil pressure is supplied to the engagement element, between the first oil passage and the second oil passage,
the oil pressure control device comprising
an electronic control unit configured to switch the oil passage from the first oil passage to the second oil passage when a switch operation is performed to switch the control condition of the automatic transmission from the first condition to the second condition, on condition that the oil pressure in the second oil passage is equal to or larger than a threshold pressure corresponding to the predetermined pressure.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 14/682,499Filed 9 Apr 2015
Priority: JP 2014-09176025 Apr 2014
Published: 29 Oct 2015
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

F16H 61/2807
With at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted: using electric control…
F16H 61/0025
Generation or control of line pressure: supply of control fluid; Pumps therefor
F16H 61/061
By controlling rate of change of fluid pressure: using electric control means
F16H 61/30
With at least one movement of the final actuating mechanism being caused by a non-mechanical force, e.g. power-assisted: hydraulic or pneumatic…