JPH0259357U

JPH0259357U -

Info

Publication number: JPH0259357U
Application number: JP13956088U
Authority: JP
Priority date: 1988-10-26
Filing date: 1988-10-26
Publication date: 1990-04-27
Anticipated expiration: 2003-10-26
Also published as: JPH0619874Y2

Description

[Brief explanation of drawings]

第１図は、自動変速機の機械的構成の概略図、
第２図は、油圧制御回路の回路図、第３図は、第
２図と同様な油圧制御回路であるが、本考案の実
施例を説明するのに必要な部材に符号を付してい
る回路図、第４図は、第３図の必要な部材を概略
的に示す図、第５図は、各レンジ、各変速段に対
するライン圧のカツトバツクの有無及びコースト
クラツチの締結、解除状態を示す図、及び、第６
図は、Ｄレンジの２速でパターン１、パターン２
を選択する流れを示すフローチヤート図である。１０……自動変速機、３０……変速歯車機構、
６０……油圧制御回路、４２……コーストクラツ
チ、６１……レギユレータバルブ、６１ａ……増
圧ポート、６１ｂ……減圧ポート、６３……１―
２シフトバルブ、６４……２―３シフトバルブ、
６５……３―４シフトバルブ、６６……第１ソレ
ノイドバルブ、６７……第２ソレノイドバルブ、
６８……第３ソレノイドバルブ、９５……スロツ
トルモデユレータバルブ、９７……カツトバツク
バルブ、９７ｂ……第１ポート、９７ｃ……第２
ポート、９７ｄ……第３ポート、１４１……ライ
ン、１４２……ライン、１４３……ライン、１４
４……ライン、１４５……ライン、１４６……ラ
イン。 FIG. 1 is a schematic diagram of the mechanical configuration of an automatic transmission;
Fig. 2 is a circuit diagram of a hydraulic control circuit, and Fig. 3 is a hydraulic control circuit similar to Fig. 2, but the members necessary for explaining the embodiment of the present invention are labeled. The circuit diagram, Fig. 4, is a diagram schematically showing the necessary parts of Fig. 3, and Fig. 5 shows the presence or absence of line pressure cutback for each range and each gear stage, and the engagement and release states of the coast clutch. Figure and 6th
The figure shows pattern 1 and pattern 2 at 2nd speed in D range.
It is a flowchart diagram showing the flow of selecting. 10... Automatic transmission, 30... Speed change gear mechanism,
60...Hydraulic control circuit, 42...Coast clutch, 61...Regulator valve, 61a...Pressure increase port, 61b...Pressure reduction port, 63...1-
2 shift valve, 64...2-3 shift valve,
65...3-4 shift valve, 66...first solenoid valve, 67...second solenoid valve,
68... Third solenoid valve, 95... Throttle modulator valve, 97... Cutback valve, 97b... First port, 97c... Second
Port, 97d...Third port, 141...Line, 142...Line, 143...Line, 14
4... line, 145... line, 146... line.

Claims

[Scope of claim for utility model registration] A low speed gear normally used as a starting gear, and
An automatic transmission having at least two gears, a high gear that may be used as a starting gear when a hold mode is selected, and a cutback control means for reducing line pressure in the high gear; for,
No cutback and coast clutch engagement 1st
A high speed gear with cutback and a second high speed gear with coast clutch released are set, and in the high speed gear of the driving range, the second high speed gear with cutback and coast clutch released is achieved, The high-speed gear of the engine range is configured to achieve the first high-speed gear with no cutback and coast clutch engagement, and when the hold mode of the driving range is selected, at the set vehicle speed or higher, the first high gear with no cutback and coast clutch released is achieved. A control device for an automatic transmission, characterized in that when the second high speed gear is achieved and the vehicle speed is lower than a set vehicle speed, the first high speed gear with no cutback and engagement of a coast clutch is achieved.