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Control method and control device of automatic transmission

A technology of automatic transmission and control method, which is applied in the direction of transmission, transmission control, gear transmission, etc., and can solve problems such as joint impact

Inactive Publication Date: 2019-04-26
MAZDA MOTOR CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] That is, when the oil pressure is supplied to the automatic transmission only by the mechanical oil pump, when the engine is automatically stopped, the frictional engagement elements of the automatic transmission are in the disengaged state, and the engagement shock will be generated due to the delayed response when the engine is restarted.

Method used

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  • Control method and control device of automatic transmission
  • Control method and control device of automatic transmission
  • Control method and control device of automatic transmission

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Embodiment Construction

[0095] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the form described below is one form of the present invention, and the present invention is not limited by any of the following forms except for its essential structure;

[0096] [Implementation form]

[0097] [Overall structure of automatic transmission 1]

[0098] figure 1 It is a schematic diagram showing the structure of the automatic transmission 1 for automobiles (vehicles) according to the embodiment of the present invention. The automatic transmission 1 includes a transmission case 2, an input shaft 3 arranged in the transmission case 2 and extending from the engine side, an output gear 4, and four planetary gear sets (the first planetary gear set 11, the second Two planetary gear sets 12, third planetary gear sets 13, fourth planetary gear sets 14), two brakes (first brake 21, second brake 22), and three clutches (first clutch 31, second clutch 32...

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Abstract

The present invention provides a control method and a control device for an automatic transmission. The purpose is to reduce the size of an oil pressure supply device, reduce the vehicle shock when the engine is restarted, and suppress the delayed response when the automatic transmission is engaged. In the present invention: when the automatic stop signal of the engine is input (time T10), the mechanical oil pump (MOP) powered by the engine is turned off, and the electric oil pump (EOP) is turned on. Then, at this time T10, the set pressure (release pressure) of the pressure reducing valve provided in the second oil passage connected to the second brake release oil pressure chamber is reduced from the oil pressure level L5 to the oil pressure level L8. By reducing the set pressure (release pressure) of the pressure reducing valve, the hydraulic pressure supplied from the EOP to the second brake can be reduced to a hydraulic pressure level L7 lower than the hydraulic pressure level L6 before time T10 .

Description

technical field [0001] The present invention relates to a control method and a control device of an automatic transmission, and particularly relates to a control method and a control device of an automatic transmission mounted on a vehicle having an automatic engine stop mechanism. Background technique [0002] In recent years, in order to reduce the environmental load including increased fuel consumption, vehicles equipped with a mechanism (idle start-stop mechanism) that automatically stops the engine when waiting for a traffic light, etc. have been developed and put into practical use. Moreover, in a vehicle equipped with such an automatic engine stop mechanism, in order to supply oil pressure to the automatic transmission, it is proposed to provide an oil pressure supply device such as an electric oil pump or an accumulator (accumulator) in addition to the mechanical oil pump powered by the engine ( Patent Document 1). [0003] That is, when oil pressure is supplied to ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16H61/02
CPCF16H61/0262F16H61/0267F16H61/0031F16H2059/446F16H2312/14F16H63/3026F16H2063/303F16H3/66F16H59/74F16H61/0021F16H61/30F16H2059/746F16H2200/006F16H2200/2012F16H2200/2043F16H61/36
Inventor 福田裕太郎笹原学齐藤忠志久保智宏
Owner MAZDA MOTOR CORP