JP6565027B2 - Hydraulic control device for power split type continuously variable transmission - Google Patents

Hydraulic control device for power split type continuously variable transmission Download PDF

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JP6565027B2
JP6565027B2 JP2014201482A JP2014201482A JP6565027B2 JP 6565027 B2 JP6565027 B2 JP 6565027B2 JP 2014201482 A JP2014201482 A JP 2014201482A JP 2014201482 A JP2014201482 A JP 2014201482A JP 6565027 B2 JP6565027 B2 JP 6565027B2
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佐藤 秀樹
秀樹 佐藤
大輔 岸
岸  大輔
平尾 知之
知之 平尾
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Daihatsu Motor Co Ltd
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Description

本発明は、動力分割式無段変速機の油圧制御装置、とりわけ動力分割式無段変速機において走行モードを切替える場合のクラッチの切替え制御に関する。   The present invention relates to a hydraulic control device for a power split type continuously variable transmission, and more particularly to clutch switching control when a running mode is switched in a power split type continuously variable transmission.

一般に、無段変速機と、副変速機とを備えた動力分割式無段変速機が提供されている。この動力分割式無段変速機では、変速機の変速範囲を拡大するため、無段変速機と、無段変速機の増速側より高いギヤ比に増速可能な副変速機とを備えており、通常走行時には無段変速機のみが駆動する無段変速機モードで走行し、高速走行時には前記無段変速機の変速を補助するために備えた副変速機、又は該副変速機と前記無段変速機とを併用して駆動するスプリットモードで走行することで、高速走行時の燃費の向上を図っている。   Generally, a power split type continuously variable transmission including a continuously variable transmission and a sub-transmission is provided. This power split type continuously variable transmission includes a continuously variable transmission and an auxiliary transmission capable of increasing the gear ratio to a higher gear ratio than the continuously variable transmission in order to expand the transmission range of the transmission. The sub-transmission is provided for assisting the shifting of the continuously variable transmission during high-speed traveling, or the sub-transmission and the sub-transmission By running in split mode, which is driven in combination with a continuously variable transmission, fuel efficiency is improved at high speeds.

無段変速機モードと、スプリットモードとの切替えは、無段変速機モード用クラッチ(又はブレーキ)と、スプリットモード用クラッチ(又はブレーキ)とを持ち替える(切替える)ことで行われる。この両クラッチの切替え制御は、作動油を供給するクラッチを変更することで行われるが、この作動油の動粘度はその油温により変化する。このため、両クラッチの摩擦係数が変化して両クラッチの切替えを安定して行うことが困難となり、その結果、切替え時間が変動してユーザにショックやエンジンの吹け上がり等の違和感を与えてしまう。   Switching between the continuously variable transmission mode and the split mode is performed by switching (switching) the continuously variable transmission mode clutch (or brake) and the split mode clutch (or brake). The switching control of both clutches is performed by changing the clutch that supplies the hydraulic oil, and the kinematic viscosity of the hydraulic oil changes depending on the oil temperature. For this reason, the friction coefficient of both clutches changes, making it difficult to switch between both clutches stably. As a result, the switching time varies, giving the user a sense of incongruity such as shock or engine run-up. .

実際に、例えば特許文献1に開示されている、無段変速機に副変速機を備えた無限変速機(無段変速機)でも、最高速度比付近の出力状態での伝達効率が改善されて車両走行燃費が向上されるものの、無段変速機モード用クラッチと、スプリットモード用クラッチと、の切替え時における作動油の油温変化の問題は残っている。   Actually, for example, even in an infinite transmission (a continuously variable transmission) that is disclosed in Patent Document 1 and includes a sub-transmission in a continuously variable transmission, the transmission efficiency in the output state near the maximum speed ratio is improved. Although the vehicle running fuel efficiency is improved, the problem of the change in the oil temperature of the hydraulic oil at the time of switching between the continuously variable transmission mode clutch and the split mode clutch remains.

特許第4552376号公報Japanese Patent No. 4552376

本発明は、上記課題に鑑み創作されたものであり、無段変速機のみが駆動する無段変速機モードと、副変速機と前記無段変速機とを併用して駆動するスプリットモードとで走行可能な動力分割式無段変速機において、作動油の油温により動粘度が変化する場合も、両モードの切替え制御を安定して実施可能な油圧制御装置の提供を目的とする。   The present invention has been created in view of the above problems, and includes a continuously variable transmission mode in which only the continuously variable transmission is driven, and a split mode in which the auxiliary transmission and the continuously variable transmission are driven in combination. An object of the present invention is to provide a hydraulic control device capable of stably performing switching control between both modes even when the kinematic viscosity changes depending on the temperature of the hydraulic oil in a power split continuously variable transmission capable of traveling.

本発明は、通常走行時には無段変速機のみが駆動する無段変速機モードで走行し、高速走行時には前記無段変速機の変速を補助するために備えた副変速機、及び/又は該副変速機と前記無段変速機とを併用して駆動するスプリットモードで走行する動力分割式無段変速機の油圧制御装置を提供する。この油圧制御装置では、
前記無段変速機モード時に係合されるクラッチ又はブレーキ、及び前記スプリットモード時に係合されるクラッチ又はブレーキの、少なくとも係合制御に用いられる作動油の動粘度が安定する所定の油温TS1以上の場合に、前記無段変速機モードと、前記スプリットモードとの切替えが許可される。
The present invention travels in a continuously variable transmission mode in which only a continuously variable transmission is driven during normal traveling, and a sub-transmission provided to assist shifting of the continuously variable transmission during high-speed traveling, and / or the sub-transmission. Provided is a hydraulic control device for a power split type continuously variable transmission that travels in a split mode that is driven by using both a transmission and the continuously variable transmission. In this hydraulic control device,
The clutch or brake engaged in the continuously variable transmission mode and the clutch or brake engaged in the split mode are at least a predetermined oil temperature TS1 at which the dynamic viscosity of the hydraulic oil used for engagement control is stabilized. In this case, switching between the continuously variable transmission mode and the split mode is permitted.

また、前記無段変速機モードと、前記スプリットモードとの切替えは、前記作動油が前記所定の油温TS1より高い所定の油温TS2以上の場合に規制され、前記無段変速機モードと、前記スプリットモードとの切替えは、前記作動油が前記所定の油温TS1より低い場合は、中止される。 Further, switching between the continuously variable transmission mode and the split mode is restricted when the hydraulic oil is at or above a predetermined oil temperature TS2 higher than the predetermined oil temperature TS1 , The switching to the split mode is stopped when the hydraulic oil is lower than the predetermined oil temperature TS1.

本発明の動力分割式無段変速機の油圧制御装置によれば、無段変速機モード時に係合されるクラッチ又はブレーキ、及びスプリットモード時に係合されるクラッチ又はブレーキの切替え制御に用いられる作動油の動粘度が安定する、所定の油温以上でのみ、両クラッチ又はブレーキの切替えが実施されるため、作動油の油温により動粘度が変化する場合も、両モードの切替え制御を安定して実施することが可能となる。   According to the hydraulic control device of the power split type continuously variable transmission of the present invention, the clutch or brake engaged in the continuously variable transmission mode and the operation used for switching control of the clutch or brake engaged in the split mode. Since both clutches and brakes are switched only when the oil kinematic viscosity is stable and above the specified oil temperature, even when the kinematic viscosity changes due to the oil temperature, the switching control of both modes is stable. Can be implemented.

また、無段変速機モードと、前記スプリットモードとの切替えは、作動油が所定の油温以上の場合に規制されるため、両モードの切替え制御を安定して実施することが可能となるとともに、詳しくは後述するが、無段変速機が備える無端ベルトの滑りによるショックの発生等を防止し、上記無端ベルトの寿命を向上させることができる。   In addition, since switching between the continuously variable transmission mode and the split mode is restricted when the hydraulic oil is at a predetermined oil temperature or higher, switching control between both modes can be stably performed. As will be described in detail later, it is possible to prevent the occurrence of a shock due to the slip of the endless belt provided in the continuously variable transmission, and to improve the life of the endless belt.

尚、上記で両クラッチ又はブレーキの切替えが許可される所定の油温は、上記切替えが規制される所定の油温よりも低く設定される。   The predetermined oil temperature at which the switching of both clutches or brakes is permitted is set lower than the predetermined oil temperature at which the switching is restricted.

本発明の一実施形態に係る動力分割式無段変速機の油圧制御装置の、制御フローの概略を示したフロー図である。It is a flow figure showing an outline of a control flow of a hydraulic control device of a power split type continuously variable transmission concerning one embodiment of the present invention. 本発明の一実施形態に係る油圧制御装置が採用される動力分割式無段変速機の構成の概略を示すスケルトン図である。1 is a skeleton diagram showing an outline of a configuration of a power split continuously variable transmission in which a hydraulic control device according to an embodiment of the present invention is employed. 本発明の一実施形態に係る油圧制御装置が採用される動力分割式無段変速機に使用される作動油の動粘度特性の概略を示す図表である。It is a graph which shows the outline of the kinematic viscosity characteristic of the hydraulic fluid used for the power split type continuously variable transmission by which the hydraulic control apparatus which concerns on one Embodiment of this invention is employ | adopted.

《動力分割式無段変速機の構成》
本発明の油圧制御装置について説明する前提として、動力分割式無段変速機の構成について、本発明の一実施形態に係る油圧制御装置が採用される動力分割式無段変速機の構成の概略を示すスケルトン図である図2を参照しながら説明する。
<Configuration of power split type continuously variable transmission>
As a premise for explaining the hydraulic control device of the present invention, the configuration of the power split continuously variable transmission is outlined with respect to the configuration of the power split continuously variable transmission. This will be described with reference to FIG.

動力分割式無段変速機50は、無段変速機10と、副変速機20とを備える。無段変速機10は、概ねプライマリプーリ12と、セカンダリプーリ14と、プライマリプーリ12とセカンダリプーリ14との間に掛け渡されて、動力を伝達する無端ベルト16とで構成される。また、副変速機20は、概ねフロントプラネタリ22と、スプリットギヤ24と、リヤプラネタリ24とで構成される。   The power split type continuously variable transmission 50 includes a continuously variable transmission 10 and an auxiliary transmission 20. The continuously variable transmission 10 is generally composed of a primary pulley 12, a secondary pulley 14, and an endless belt 16 that is stretched between the primary pulley 12 and the secondary pulley 14 to transmit power. The auxiliary transmission 20 is generally composed of a front planetary 22, a split gear 24, and a rear planetary 24.

無段変速機10のみが駆動する無段変速機モード(以下、単に「CVTモード」とも称する)で走行する場合は、CVTモードクラッチ30が係合されて、エンジン(図示せず)から動力分割式無段変速機50へ入力された駆動力を無段変速機10で変速して出力し、車両(図示せず)は走行する。   When traveling in a continuously variable transmission mode in which only the continuously variable transmission 10 is driven (hereinafter also simply referred to as “CVT mode”), the CVT mode clutch 30 is engaged and power split from an engine (not shown). The driving force input to the continuously variable transmission 50 is shifted and output by the continuously variable transmission 10, and the vehicle (not shown) travels.

副変速機20、及び/又は副変速機20と無段変速機10とを併用して駆動するスプリットモードで走行する場合は、スプリットモードブレーキ32が係合されて、上記エンジンから動力分割式無段変速機50へ入力された駆動力を副変速機20、及び/又は副変速機20と無段変速機10とを併用して変速して出力し、上記車両は走行する。   When traveling in the split mode in which the sub-transmission 20 and / or the sub-transmission 20 and the continuously variable transmission 10 are driven in combination, the split mode brake 32 is engaged and the engine is separated from the engine. The driving force input to the stepped transmission 50 is shifted and output using the auxiliary transmission 20 and / or the auxiliary transmission 20 and the continuously variable transmission 10 together, and the vehicle travels.

車両が停止状態から発進、加速する通常走行時は、CVTモードクラッチ30が係合されてCVTモードで走行し、車両速度が所定値以上になる等の条件が成立すると、スプリットモードブレーキ32が係合され、CVTモードクラッチ30が解放されてスプリットモードでの走行に移行する。   During normal driving, where the vehicle starts and accelerates from a stopped state, the CVT mode clutch 30 is engaged and the vehicle travels in the CVT mode, and if the vehicle speed exceeds a predetermined value, the split mode brake 32 is engaged. The CVT mode clutch 30 is released and the vehicle shifts to the split mode.

このとき、係合状態にあるCVTモードクラッチ30を開放するとともに、開放状態にあるスプリットモードブレーキ32を係合する、いわゆる持ち替え制御が行われる。本発明の油圧制御装置においては、係合制御(持ち替え制御)に用いられる作動油(図示せず)の動粘度が安定する所定の油温以上の場合に、無段変速機モードと、スプリットモードとの切替え制御が許可される。   At this time, so-called holding control is performed in which the CVT mode clutch 30 in the engaged state is released and the split mode brake 32 in the released state is engaged. In the hydraulic control device of the present invention, when the kinematic viscosity of hydraulic oil (not shown) used for engagement control (holding control) is equal to or higher than a predetermined oil temperature, the continuously variable transmission mode and the split mode Switching control is permitted.

詳述すると、本発明の一実施形態に係る油圧制御装置(図示せず)が採用される動力分割式無段変速機50に使用される作動油の動粘度特性の概略を示す図表である図3に示すように、作動油の動粘度は作動油の温度(以下、単に「油温」とも称する)により大きく変化する。特に低油温の場合には、油温の変化による動粘度の変化が大きい。   More specifically, it is a chart showing an outline of kinematic viscosity characteristics of hydraulic oil used in a power split type continuously variable transmission 50 in which a hydraulic control device (not shown) according to an embodiment of the present invention is employed. As shown in FIG. 3, the kinematic viscosity of the hydraulic oil varies greatly depending on the temperature of the hydraulic oil (hereinafter also simply referred to as “oil temperature”). In particular, when the oil temperature is low, the change in kinematic viscosity due to the change in oil temperature is large.

本発明の油圧制御装置では、作動油の油温が所定油温TS1以上の場合に、CVTモードと、スプリットモードとの切替えが許可される。   In the hydraulic control device of the present invention, switching between the CVT mode and the split mode is permitted when the oil temperature of the hydraulic oil is equal to or higher than the predetermined oil temperature TS1.

《本発明の油圧制御装置の制御構成》
本発明の油圧制御装置における両モード間のモード切替え制御について、本発明の一実施形態に係る動力分割式無段変速機50の油圧制御装置の、制御フローの概略を示したフロー図である図1を参照しながら、詳細に説明する。
<< Control Configuration of Hydraulic Control Device of the Present Invention >>
FIG. 3 is a flowchart showing an outline of a control flow of a hydraulic control device of a power split type continuously variable transmission 50 according to an embodiment of the present invention, for mode switching control between both modes in the hydraulic control device of the present invention. This will be described in detail with reference to FIG.

図1の制御フローのSTEP110(以下、単に「S110」と称す。他のSTEPも同様とする)でモード切替え制御が開始される。S112では、作動油の油温がTS1以上であることが確認される。上記の確認結果を満たせば、S114へ進む。   The mode switching control is started at STEP 110 in the control flow of FIG. 1 (hereinafter simply referred to as “S110”, and the same applies to other STEPs). In S112, it is confirmed that the oil temperature of the hydraulic oil is TS1 or higher. If the confirmation result is satisfied, the process proceeds to S114.

作動油の油温がTS1よりも低い場合は、作動油の動粘度が安定しておらず、作動油の動粘度が油圧制御により吸収可能な範囲にないため、モード切替えを安定して行える状況にないと判断され、モード切替え制御は中止される。   When the oil temperature of the hydraulic oil is lower than TS1, the dynamic viscosity of the hydraulic oil is not stable, and the dynamic viscosity of the hydraulic oil is not within the range that can be absorbed by hydraulic control, so the mode can be switched stably. Therefore, the mode switching control is stopped.

図1のS114では、車両速度が所定値以上であることが確認される。上記の確認結果を満たせば、S116へ進む。車両速度が所定値より低い場合は、CVTモードでの走行を継続した方が燃費向上のため有利であると判断され、モード切替えは中止される。   In S114 of FIG. 1, it is confirmed that the vehicle speed is equal to or higher than a predetermined value. If the confirmation result is satisfied, the process proceeds to S116. If the vehicle speed is lower than the predetermined value, it is determined that it is more advantageous to continue traveling in the CVT mode in order to improve fuel consumption, and mode switching is stopped.

図1のS116では、アクセル開度が所定値以上であることが確認される。上記の確認結果を満たせば、S118へ進む。アクセル開度が所定値より低い場合は、ユーザ(運転者)に減速の意図があると判断され、モード切替え制御は中止される。   In S116 of FIG. 1, it is confirmed that the accelerator opening is equal to or greater than a predetermined value. If the confirmation result is satisfied, the process proceeds to S118. If the accelerator opening is lower than the predetermined value, it is determined that the user (driver) intends to decelerate, and the mode switching control is stopped.

図1のS118では、S112〜S116までの結果を受け、モード切替えが許可されてCVTモードと、スプリットモードとの切替え制御が実行され、S120で上記切替え制御が終了される。   In S118 of FIG. 1, in response to the results of S112 to S116, mode switching is permitted, switching control between the CVT mode and the split mode is executed, and the switching control is terminated in S120.

上述してきた制御フローに従って、CVTモードと、スプリットモードとの切替え制御が実行されることにより、両モードの切替え制御を安定して実施することを達成し得る。   By executing switching control between the CVT mode and the split mode according to the control flow described above, it is possible to achieve stable switching control between both modes.

また、本発明の油圧制御装置では、作動油の油温が所定油温TS2以上の場合に、無段変速機モードと、スプリットモードとの切替えが規制される。この場合の制御フローは、上述した作動油の油温が所定油温TS1以上の場合に、無段変速機モードと、スプリットモードとの切替えが許可される場合とほぼ同様であるので、詳細な説明は省略する。   Further, in the hydraulic control device of the present invention, switching between the continuously variable transmission mode and the split mode is restricted when the oil temperature of the hydraulic oil is equal to or higher than the predetermined oil temperature TS2. The control flow in this case is almost the same as the case where switching between the continuously variable transmission mode and the split mode is permitted when the oil temperature of the hydraulic oil is equal to or higher than the predetermined oil temperature TS1. Description is omitted.

相違する点は、作動油の油温が所定油温TS2以上の場合に、無段変速機モードと、スプリットモードとの切替えが規制される場合においては、図1のSTEP110で、作動油の油温がTS2よりも低いこと、が確認される点である。   The difference is that in the case where switching between the continuously variable transmission mode and the split mode is restricted when the oil temperature of the hydraulic oil is equal to or higher than the predetermined oil temperature TS2, in step 110 of FIG. It is a point that temperature is lower than TS2.

作動油の油温が所定油温TS2以上の場合に、両モードの切替え制御を規制することにより、両モードの切替え制御を安定して実施することが可能となるとともに、無段変速機20が備える上記無端ベルト16の滑りによるショックの発生等を防止し、無端ベルト16の寿命を向上させることができる。   When the oil temperature of the hydraulic oil is equal to or higher than the predetermined oil temperature TS2, it is possible to stably perform the switching control of both modes by restricting the switching control of both modes, and the continuously variable transmission 20 The occurrence of a shock due to the slip of the endless belt 16 provided can be prevented, and the life of the endless belt 16 can be improved.

詳述すると、作動油の油温が所定のTS2以上となると、動粘度の低下に伴ってクラッチ、及び/又はブレーキの動摩擦係数が低下する。このため、両モードの切替え制御を行った場合、クラッチ、及び/又はブレーキにおいてスムーズに係合力が作用せず、異音や振動が起きる、いわゆるジャダーが生じてしまう。   More specifically, when the oil temperature of the hydraulic oil is equal to or higher than a predetermined TS2, the dynamic friction coefficient of the clutch and / or the brake is lowered as the kinematic viscosity is lowered. For this reason, when switching control of both modes is performed, the engagement force does not act smoothly in the clutch and / or the brake, and so-called judder is generated in which abnormal noise or vibration occurs.

このジャダーが生じると、振動が発生したり、図2に示す無段変速機10において、上記プライマリプーリ12と、セカンダリプーリ14との間で動力を伝達する上端ベルト16への入力が過大となる場合がある。このため、上記プーリと無端ベルト16とが相対的に滑ってしまうベルト滑りが発生し、無端ベルト16が損傷して寿命が低下したり、プライマリプーリ12やセカンダリプーリ14が損傷して正常な変速が困難となる。   When this judder occurs, vibration is generated, or in the continuously variable transmission 10 shown in FIG. 2, the input to the upper end belt 16 that transmits power between the primary pulley 12 and the secondary pulley 14 becomes excessive. There is a case. For this reason, a belt slip occurs in which the pulley and the endless belt 16 slide relative to each other, the endless belt 16 is damaged and the service life is shortened, or the primary pulley 12 and the secondary pulley 14 are damaged to perform a normal shift. It becomes difficult.

本発明の油圧制御装置では、上述したように、作動油の油温が所定油温TS2以上の場合には、無段変速機モードと、スプリットモードとの切替えが規制される。したがって、上記したような、無端ベルト16の損傷による寿命低下や、プライマリプーリ12や、セカンダリプーリ14の損傷により正常な変速が困難となることを防止し得る。   In the hydraulic control device of the present invention, as described above, when the oil temperature of the hydraulic oil is equal to or higher than the predetermined oil temperature TS2, switching between the continuously variable transmission mode and the split mode is restricted. Therefore, it is possible to prevent the above-described decrease in life due to damage to the endless belt 16 and difficulty in normal gear shifting due to damage to the primary pulley 12 and the secondary pulley 14 as described above.

尚、上記ではCVTモードからスプリットモードへ移行する場合を例に説明したが、スプリットモードからCVTモードへ移行する場合も同様である。また、上記ではCVTモード時に係合するものをクラッチとし、スプリットモード時に係合するものをブレーキとしたが、これは動力分割式無段変速機の構成により適宜変更されても良い。   In the above description, the case of shifting from the CVT mode to the split mode has been described as an example, but the same applies to the case of shifting from the split mode to the CVT mode. In the above description, the clutch that is engaged in the CVT mode is a clutch and the brake that is engaged in the split mode is a brake. However, this may be changed as appropriate depending on the configuration of the power split continuously variable transmission.

また、作動油の油温を検知する手段としては、一例として動力分割式無段変速機50が備える油温センサ(図示せず)が考えられる。この油温センサが配設される位置は、制御により油路を切り換える油圧回路の中でも良いし、作動油が貯留されるオイルパン(図示せず)等でも良く、配置位置は適宜、設定可能である。また、車両に搭載される他の機器により、動力分割式無段変速機50の作動油の油温が検知されても良い。   As an example of means for detecting the oil temperature of the hydraulic oil, an oil temperature sensor (not shown) provided in the power split continuously variable transmission 50 can be considered. The position where the oil temperature sensor is disposed may be in a hydraulic circuit that switches the oil path by control, or may be an oil pan (not shown) in which hydraulic oil is stored, and the position of the oil temperature sensor can be set as appropriate. is there. Moreover, the oil temperature of the hydraulic oil of the power split type continuously variable transmission 50 may be detected by other equipment mounted on the vehicle.

以上、本発明の動力分割式無段変速機の油圧制御装置についての実施形態およびその概念について説明してきたが、本発明はこれに限定されるものではなく、特許請求の範囲および明細書等に記載の精神や教示を逸脱しない範囲で他の変形例、改良例が得られることが当業者は理解できるであろう。   As described above, the embodiment and concept of the hydraulic control device of the power split type continuously variable transmission according to the present invention have been described, but the present invention is not limited to this, and the claims and the description etc. Those skilled in the art will appreciate that other variations and modifications can be obtained without departing from the spirit and teaching of the description.

10 無段変速機
12 プライマリプーリ
14 セカンダリプーリ
16 無端ベルト
20 副変速機
22 フロントプラネタリ
24 スプリットギヤ
26 リヤプラネタリ
30 CVTモードクラッチ
32 スプリットモードブレーキ
50 動力分割式無段変速機
TS1 モード切替えが許可される所定油温
TS2 モード切替えが規制される所定油温
DESCRIPTION OF SYMBOLS 10 Continuously variable transmission 12 Primary pulley 14 Secondary pulley 16 Endless belt 20 Subtransmission 22 Front planetary 24 Split gear 26 Rear planetary 30 CVT mode clutch 32 Split mode brake 50 Power split type continuously variable transmission TS1 Mode switching is permitted Predetermined oil temperature TS2 Predetermined oil temperature at which mode switching is regulated

Claims (1)

通常走行時には無段変速機のみが駆動する無段変速機モードで走行し、高速走行時には前記無段変速機の変速を補助するために備えた副変速機、及び/又は該副変速機と前記無段変速機とを併用して駆動するスプリットモードで走行する動力分割式無段変速機の油圧制御装置であって、
前記無段変速機モード時に係合されるクラッチ又はブレーキ、及び前記スプリットモード時に係合されるクラッチ又はブレーキの、少なくとも係合制御に用いられる作動油の動粘度が安定する所定の油温TS1以上の場合に、前記無段変速機モードと、前記スプリットモードとの切替えが許可され、
前記無段変速機モードと、前記スプリットモードとの切替えは、前記作動油が前記所定の油温TS1より高い所定の油温TS2以上の場合に規制され、
前記無段変速機モードと、前記スプリットモードとの切替えは、前記作動油が前記所定の油温TS1より低い場合は、中止される、
ことを特徴とする、動力分割式無段変速機の油圧制御装置。
It travels in a continuously variable transmission mode in which only the continuously variable transmission is driven during normal traveling, and a sub-transmission provided to assist shifting of the continuously variable transmission during high-speed traveling, and / or the sub-transmission and the A hydraulic control device for a power split type continuously variable transmission that travels in a split mode that is driven in combination with a continuously variable transmission,
The clutch or brake engaged in the continuously variable transmission mode and the clutch or brake engaged in the split mode are at least a predetermined oil temperature TS1 at which the dynamic viscosity of the hydraulic oil used for engagement control is stabilized. In this case, switching between the continuously variable transmission mode and the split mode is permitted ,
Switching between the continuously variable transmission mode and the split mode is restricted when the hydraulic oil is equal to or higher than a predetermined oil temperature TS2 higher than the predetermined oil temperature TS1,
Switching between the continuously variable transmission mode and the split mode is stopped when the hydraulic oil is lower than the predetermined oil temperature TS1.
A hydraulic control device for a power split type continuously variable transmission.
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