JP2020079622A - Control device for vehicle - Google Patents

Control device for vehicle Download PDF

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JP2020079622A
JP2020079622A JP2018213085A JP2018213085A JP2020079622A JP 2020079622 A JP2020079622 A JP 2020079622A JP 2018213085 A JP2018213085 A JP 2018213085A JP 2018213085 A JP2018213085 A JP 2018213085A JP 2020079622 A JP2020079622 A JP 2020079622A
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temperature
shift
working fluid
vehicle
set value
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JP7055730B2 (en
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チャドル 金
Chadol Kim
チャドル 金
渡辺　正樹
Masaki Watanabe
正樹 渡辺
赤澤　浩明
Hiroaki Akazawa
浩明 赤澤
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JATCO Ltd
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Abstract

To achieve both facilitation of promotion temperature rise of a working fluid of a hydraulic type automatic transmission mounted on a vehicle and securing of an operation performance of the vehicle.SOLUTION: A control device for vehicle includes an automatic transmission 2 in which a working fluid is supplied, a driving source 1 in which a cooling fluid is supplied, and a heat exchanger 5 for performing heat exchange between the working fluid and the cooling fluid. The control device also has a control part 10 which performs shift limiting for prohibiting the transmission ratio of the automatic transmission 2 from becoming equal to or less than a predetermined transmission ratio, in the case where a temperature of the working fluid is equal to or less than a first set value. The control part 10 releases the shift limiting in the case where the temperature of the cooling fluid is higher than the temperature of the working fluid, even though the temperature of the working fluid is equal to or less than the first set value.SELECTED DRAWING: Figure 1

Description

本発明は、自動変速機の作動油を昇温させる制御を実施する車両の制御装置に関するものである。   The present invention relates to a vehicle control device that performs control for raising the temperature of hydraulic oil for an automatic transmission.

作動油（作動流体）を用いて変速を制御する油圧式自動変速機（無段変速機あるいは有段変速機）では、作動油の温度が低いと作動油の粘性が高くなるため、作動油の供給速度の低下や摺動摩擦抵抗の増大を招き、変速応答性が低下する。車両用自動変速機の場合には、車両の運転性能の低下を招く。このため、低温状態の作動油を速やかに昇温させることや、車両の運転性能の低下を抑制できるようにすることが要望される。   In a hydraulic automatic transmission (continuously variable transmission or stepped transmission) that controls gear shifting using hydraulic fluid (working fluid), the viscosity of hydraulic fluid increases when the temperature of hydraulic fluid is low, so This leads to a decrease in the supply speed and an increase in sliding friction resistance, resulting in a decrease in shift response. In the case of an automatic transmission for a vehicle, the driving performance of the vehicle is deteriorated. Therefore, it is required to quickly raise the temperature of the hydraulic oil in a low temperature state and to suppress the deterioration of the driving performance of the vehicle.

特許文献１には、車両用無段変速機において、作動油温度が低くなるのに伴って変速比をエンジン回転速度が増加する側へ補正する技術が開示されている。この技術では、変速比をロー側に補正することにより、エンジン回転速度を増加させてエンジン出力を高めることができ、無段変速機の入力側の回転速度の上昇によって、無段変速機の暖機が促進され、作動油が昇温するため変速応答性が改善される。   Patent Document 1 discloses a technique for correcting a gear ratio of a continuously variable transmission for a vehicle such that the engine rotation speed increases as the hydraulic oil temperature decreases. In this technology, by correcting the gear ratio to the low side, it is possible to increase the engine speed and increase the engine output, and the increase of the input side speed of the continuously variable transmission causes the continuously variable transmission to warm up. The speed of the machine is accelerated and the temperature of the hydraulic oil rises, so that the speed change response is improved.

特開昭６１−８８０６５号公報JP-A-61-88065

特許文献１の技術では、作動油の温度が低いと、エンジン出力が高められ駆動源の出力不足が抑えられるため、出力不足に起因した車両の運転性能の低下は抑制される。しかしながら、変速比をロー側に補正するため、変速制御は最適な制御態様から乖離することになり、車両の運転性能は低下してしまう。つまり、自動変速機においては、作動流体の温度上昇を促進する制御により車両の運転性能が犠牲になってしまう。   In the technique of Patent Document 1, when the temperature of the hydraulic oil is low, the engine output is increased and the output shortage of the drive source is suppressed, so that the deterioration of the driving performance of the vehicle due to the output shortage is suppressed. However, since the gear ratio is corrected to the low side, the gear shift control deviates from the optimum control mode, and the driving performance of the vehicle deteriorates. That is, in the automatic transmission, the driving performance of the vehicle is sacrificed by the control for promoting the temperature rise of the working fluid.

本発明はこのような課題に着目してなされたもので、車両に装備された油圧式自動変速機の作動流体の温度上昇の促進と車両の運転性能の確保との両立を図ることを目的とする。   The present invention has been made in view of such a problem, and an object thereof is to achieve both of promotion of temperature rise of working fluid of a hydraulic automatic transmission mounted on a vehicle and securing of driving performance of the vehicle. To do.

上記の目的を達成するために、本発明にかかる車両の制御装置は、作動流体が供給される自動変速機と、冷却用流体が供給される駆動源と、前記作動流体と前記冷却用流体の熱交換を行う熱交換器と、を有する車両の制御装置であって、前記作動流体の温度が第１設定値以下である場合に前記自動変速機が所定変速比以下となることを禁止する変速制限を行う制御部を有し、前記制御部は、前記作動流体の温度が第１設定値以下であっても、前記冷却用流体の温度が前記作動流体の温度よりも高い場合は前記変速制限を解除することを特徴としている。   In order to achieve the above object, a vehicle control device according to the present invention includes an automatic transmission to which a working fluid is supplied, a drive source to which a cooling fluid is supplied, and a working fluid and a cooling fluid. A control device for a vehicle having a heat exchanger for exchanging heat, wherein the automatic transmission is prohibited from falling below a predetermined gear ratio when the temperature of the working fluid is below a first set value. The control unit includes a control unit that performs a limitation, and the control unit limits the shift when the temperature of the cooling fluid is higher than the temperature of the working fluid even if the temperature of the working fluid is equal to or lower than a first set value. It is characterized by releasing.

前記自動変速機は、無段変速機であり、前記制御部は、前記変速制限をしている場合に前記所定変速比以上の領域では前記変速制限をしていない場合の変速線と同じ変速線を選択して変速を実行することが好ましい。
前記自動変速機は、有段変速機であり、前記制御部は、前記変速制限をしている場合には、前記所定変速比以上の変速段間での変速の実行を許可することが好ましい。
前記制御部は、前記作動流体の温度が前記第１設定値よりも低い第２設定値以下の場合は、前記作動流体の温度と前記冷却用流体の温度との関係に関わらず、前記変速制限を実行することが好ましい。
前記制御部は、前記作動流体の温度が前記第１設定値よりも高い場合は前記変速制限を禁止することが好ましい。
前記制御部は、前記冷却用流体の温度が第３設定値よりも高い場合は前記変速制限を禁止することが好ましい。
前記作動流体の温度を検知する第１温度センサを前記熱交換器近傍に取り付け、前記冷却用流体の温度を検知する第２温度センサを前記熱交換器近傍に取り付けることが好ましい。 The automatic transmission is a continuously variable transmission, and the control unit has the same shift line as a shift line when the shift limit is set and the shift limit is not set in a region equal to or higher than the predetermined gear ratio. It is preferable to select to execute the gear shift.
It is preferable that the automatic transmission is a stepped transmission, and the control unit permits execution of a shift between shift speeds equal to or higher than the predetermined gear ratio when the shift is restricted.
When the temperature of the working fluid is equal to or lower than a second set value that is lower than the first set value, the control unit limits the shift regardless of the relationship between the temperature of the working fluid and the temperature of the cooling fluid. Is preferably performed.
It is preferable that the control unit prohibits the shift limitation when the temperature of the working fluid is higher than the first set value.
It is preferable that the control section prohibits the shift limitation when the temperature of the cooling fluid is higher than a third set value.
It is preferable that a first temperature sensor that detects the temperature of the working fluid is mounted near the heat exchanger, and a second temperature sensor that detects the temperature of the cooling fluid is mounted near the heat exchanger.

本発明によれば、変速制限を行うことにより自動変速機自身における発熱が促進される。ただし、作動流体の温度が低い場合は変速制限により流体温度の上昇を促進することを基本とするが、駆動源の冷却用流体の温度が作動流体の温度よりも高い場合は熱交換により作動流体の温度を引き上げるので、この場合は変速制限を解除して運転性能の低下を抑制することができる。このようにして、作動流体の温度上昇の促進と運転性能との両立を実現することができる。   According to the present invention, heat generation in the automatic transmission itself is promoted by limiting the shift. However, when the temperature of the working fluid is low, it is basically to promote the increase of the fluid temperature by limiting the shift, but when the temperature of the cooling fluid of the drive source is higher than the temperature of the working fluid, the working fluid is exchanged by heat exchange. In this case, it is possible to cancel the shift limitation and suppress the deterioration of the driving performance. In this way, it is possible to achieve both promotion of temperature rise of the working fluid and operational performance.

本発明の一実施形態にかかる車両の制御装置を車両のパワートレインの一部と共に示す構成図である。It is a block diagram which shows the control apparatus of the vehicle concerning one Embodiment of this invention with a part of power train of a vehicle. 本発明の一実施形態にかかる車両の制御装置による制御に用いられる変速マップの例を示す図である。It is a figure which shows the example of the shift map used for control by the control device of the vehicle concerning one Embodiment of this invention. 本発明の一実施形態にかかる車両の制御装置による制御を説明するフローチャートである。3 is a flowchart illustrating control performed by the vehicle control device according to the embodiment of the present invention.

以下、図面を参照して、本発明の実施の形態を説明する。なお、以下に示す実施形態はあくまでも例示に過ぎず、以下の実施形態で明示しない種々の変形や技術の適用を排除する意図はない。以下の実施形態の各構成は、それらの趣旨を逸脱しない範囲で種々変形して実施することができるとともに、必要に応じて取捨選択することや適宜組み合わせることが可能である。   Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments described below are merely examples, and there is no intention to exclude various modifications and application of techniques that are not explicitly shown in the following embodiments. The configurations of the following embodiments can be variously modified and implemented without departing from the spirit thereof, and can be appropriately selected or combined as needed.

〔パワートレインの構成〕
図１は本実施形態に係る車両の制御装置を車両のパワートレインの一部と共に示す構成図である。図１に示すように、車両のパワートレインには、駆動源としてエンジン（内燃機関）１が装備され、エンジン１には自動変速機２が連結され、エンジン１の出力は自動変速機２を介して図示しない駆動輪に伝達される。なお、駆動源には、エンジン１に代えて、或いは、エンジン１に加えて、電動モータ（モータジェネレータ）が装備されてもよい。 [Powertrain configuration]
FIG. 1 is a configuration diagram showing a vehicle control device according to the present embodiment together with a part of a vehicle power train. As shown in FIG. 1, a power train of a vehicle is equipped with an engine (internal combustion engine) 1 as a drive source, an automatic transmission 2 is connected to the engine 1, and the output of the engine 1 is transmitted through the automatic transmission 2. Is transmitted to the drive wheels (not shown). The drive source may be equipped with an electric motor (motor generator) instead of the engine 1 or in addition to the engine 1.

エンジン１には、冷却水（冷却用流体）を利用した冷却システムが付設されている。この冷却システムは、エンジン１のシリンダブロック及びシリンダヘッドに形成されたウォータジャケット（図示略）と、エンジン１に冷却水を供給する冷却水循環回路３とを備えている。冷却水循環回路３には、冷却水が循環する流路３１と、流路３１に介装されたウォータポンプ３２及びラジエータ３３と、ラジエータ３３をバイパスするように流路３１に接続されたバイパス流路３４と、切替弁３５とが装備される。切換弁３５により冷却水の流通ルートがラジエータ３３とバイパス流路３４とで切り替えられる。
また、ラジエータ３３及びバイパス流路３４の下流側とウォータポンプ３２との間には、自動変速機２の作動油との熱交換を行う熱交換器５が設けられている。 The engine 1 is provided with a cooling system using cooling water (cooling fluid). This cooling system includes a water jacket (not shown) formed in a cylinder block and a cylinder head of the engine 1, and a cooling water circulation circuit 3 that supplies cooling water to the engine 1. In the cooling water circulation circuit 3, a flow passage 31 through which the cooling water circulates, a water pump 32 and a radiator 33 interposed in the flow passage 31, and a bypass flow passage connected to the flow passage 31 so as to bypass the radiator 33. 34 and a switching valve 35 are equipped. The switching valve 35 switches the distribution route of the cooling water between the radiator 33 and the bypass passage 34.
Further, between the downstream side of the radiator 33 and the bypass passage 34 and the water pump 32, a heat exchanger 5 that exchanges heat with the hydraulic fluid of the automatic transmission 2 is provided.

このような冷却システムでは、エンジン冷態時には、暖機促進のためにエンジン１から流出した冷却水は流路３１を流通してラジエータ３３に流入しないでバイパス流路３４を経てウォータポンプ３２によって吸引、吐出されてエンジン１に再流入する。エンジン暖機後には、エンジン１を冷却して昇温した冷却水は流路３１を流通してラジエータ３３に流入して放熱，冷却され、ウォータポンプ３２から吐出されてエンジン１に再流入する。   In such a cooling system, when the engine is in a cold state, the cooling water flowing out of the engine 1 for promoting warm-up does not flow into the radiator 33 and flow into the radiator 33, and is sucked by the water pump 32 via the bypass passage 34. , Are discharged and flow into the engine 1 again. After the engine has been warmed up, the cooling water that has cooled the engine 1 and has risen in temperature flows through the flow path 31 and flows into the radiator 33 to radiate and cool, and is discharged from the water pump 32 and flows into the engine 1 again.

自動変速機２は、トルクコンバータ２ＡとＶベルト式の無段変速機２Ｂとを備え、エンジン１からの駆動力はトルクコンバータ２Ａを介して無段変速機２Ｂに入力され適宜の変速比で変速されて駆動輪側に出力される。無段変速機２Ｂは、プライマリプーリ２１と、セカンダリプーリ２２と、これらのプーリ２１，２２に掛け回されたベルト（無端可撓部材）２３とを備えている。   The automatic transmission 2 includes a torque converter 2A and a V-belt type continuously variable transmission 2B, and the driving force from the engine 1 is input to the continuously variable transmission 2B via the torque converter 2A to shift gears at an appropriate gear ratio. And output to the drive wheel side. The continuously variable transmission 2B includes a primary pulley 21, a secondary pulley 22, and a belt (endless flexible member) 23 wound around these pulleys 21 and 22.

プライマリプーリ２１及びセカンダリプーリ２２には、それぞれ、固定シーブ２１ａ，２２ａと可動シーブ２１ｂ，２２ｂと、可動シーブ２１ｂ，２２ｂに推力を加えるための油圧室２１ｃ，２２ｃとが備えられる。油圧室２１ｃ，２２ｃの油圧は、コントロールバルブユニット４内の図示しない油圧調整弁等によって制御される。   The primary pulley 21 and the secondary pulley 22 are provided with fixed sheaves 21a and 22a, movable sheaves 21b and 22b, and hydraulic chambers 21c and 22c for applying thrust to the movable sheaves 21b and 22b, respectively. The hydraulic pressure in the hydraulic chambers 21c and 22c is controlled by a hydraulic pressure adjusting valve (not shown) in the control valve unit 4.

コントロールバルブユニット４へは、オイルポンプ２５によってオイルタンク２４内の作動油（作動流体）が供給され、自動変速機２から排出される作動油は油路２６により熱交換機５を介してオイルタンク２４へ放出される。したがって、通常時には、自動変速機２内で使用されて温度上昇した作動油は、熱交換器５を通過することにより冷却水によって冷却され、自動変速機２にとって適正な温度（通常使用温度域）状態の保持されることとなる。
また、トルクコンバータ２Ａには図示しないロックアップクラッチが装備され、コントロールバルブユニット４内の図示しない油圧調整弁等によって制御される。 The control valve unit 4 is supplied with working oil (working fluid) in the oil tank 24 by the oil pump 25, and working oil discharged from the automatic transmission 2 is passed through the oil passage 26 via the heat exchanger 5 to the oil tank 24. Is released to. Therefore, normally, the hydraulic oil that has been used in the automatic transmission 2 and has increased in temperature is cooled by the cooling water as it passes through the heat exchanger 5, so that the automatic transmission 2 has an appropriate temperature (normal operating temperature range). The state will be retained.
Further, the torque converter 2A is equipped with a lock-up clutch (not shown), and is controlled by a hydraulic pressure adjusting valve (not shown) in the control valve unit 4.

〔作動油及び冷却水の温度調整〕
本装置では、低温状態の作動油を昇温させるために、自動変速機２の運転性能の確保ひいては車両の運転性能の確保のために、２つの昇温手法を選択的に用いる制御を実施する。 [Temperature adjustment of hydraulic oil and cooling water]
In the present device, in order to raise the temperature of the hydraulic oil in a low temperature state, the control that selectively uses two temperature raising methods is performed in order to secure the driving performance of the automatic transmission 2 and thus the driving performance of the vehicle. ..

一つの昇温手法としては、作動油の温度が冷却水の温度よりも低い場合において、熱交換器５での熱交換によって作動油を昇温する。
エンジン冷態時での運転開始（エンジン始動）後は、水温の上昇が油温の上昇よりも速く、油温よりも水温の方が高くなる状態があるので、この状態では熱交換器５で高い冷却水の温度を利用して作動油を昇温させることができる。 As one temperature raising method, when the temperature of the hydraulic oil is lower than the temperature of the cooling water, the temperature of the hydraulic oil is raised by heat exchange in the heat exchanger 5.
After the engine is started in the cold state (engine start), the water temperature rises faster than the oil temperature, and there is a state where the water temperature is higher than the oil temperature. The temperature of the hydraulic oil can be raised by utilizing the high temperature of the cooling water.

また、もう一つの昇温手法としては、変速比を高く維持する変速制限によってエンジン１の高回転域を用いるようにして作動油を昇温する。つまり、自動変速機２の無段変速機２Ｂを制御する制御部としての自動変速機制御ユニット（ＡＴＣＵ）１０を備えており、このＡＴＣＵ１０は、無段変速機２Ｂの変速制御にあたって、所定条件下で変速比Ｒが所定変速比（規制変速比）Ｒｓ以下となることを禁止する変速制限を行う。この変速制限によって、無段変速機２Ｂの変速比が比較的高い変速比領域内に保持され、エンジン１の比較的高回転域が用いられるようになるため、無段変速機２Ｂの入力側の回転速度が上昇し無段変速機２Ｂの暖機が促進されて、作動油を昇温するようになっている。   As another temperature raising method, the temperature of the hydraulic oil is raised by using the high rotation speed range of the engine 1 by the shift limitation for keeping the gear ratio high. That is, the automatic transmission control unit (ATCU) 10 as a control unit for controlling the continuously variable transmission 2B of the automatic transmission 2 is provided, and this ATCU 10 has a predetermined condition for shifting control of the continuously variable transmission 2B. Thus, the speed change restriction is performed to prohibit the speed change ratio R from falling below a predetermined speed change ratio (regulated speed change ratio) Rs. Due to this gear shift restriction, the gear ratio of the continuously variable transmission 2B is maintained within a relatively high gear ratio region, and the relatively high rotation speed range of the engine 1 is used. The rotation speed is increased, the warm-up of the continuously variable transmission 2B is promoted, and the temperature of the hydraulic oil is raised.

なお、ＡＴＣＵ１０には、アクセル開度ＡＰＯを検出するアクセル開度センサ６１，入力回転速Ｎinを検出する回転速度センサ６２，車速ＶＳＰを検出する車速センサ６３，作動油の油温Ｔoiを検出する油温センサ（第１温度センサ）６４，冷却水の水温Ｔｗを検出する水温センサ（第２温度センサ）６５の各種センサ類から検出情報が入力され、ＡＴＣＵ１０では、これらの検出情報に基づいて制御を行う。
また、油温センサ６４及び水温センサ６５は熱交換器５の近傍の油路及び流路にそれぞれ取り付けられている。 The ATCU 10 includes an accelerator opening sensor 61 for detecting the accelerator opening APO, a rotation speed sensor 62 for detecting the input rotation speed Nin, a vehicle speed sensor 63 for detecting the vehicle speed VSP, and an oil for detecting the oil temperature Toi of the hydraulic oil. Detection information is input from various sensors such as a temperature sensor (first temperature sensor) 64 and a water temperature sensor (second temperature sensor) 65 that detects the cooling water temperature Tw, and the ATCU 10 performs control based on these detection information. To do.
Further, the oil temperature sensor 64 and the water temperature sensor 65 are attached to the oil passage and the flow passage near the heat exchanger 5, respectively.

図２に示すように、無段変速機２Ｂは、車速（出力回転速度）Ｖspと入力回転数（入力回転速度）Ｎinとの比として規定される変速比Ｒを最ローＲｌと最ハイＲｈとの間で制御されるが、変速比Ｒが所定変速比（規制変速比）Ｒｓ以下となることを禁止すると、変速比Ｒを最ローＲｌと所定変速比Ｒｓとの間で制御される。変速比Ｒが大きいほど車速Ｖspに対する入力回転数Ｎinが大きく、したがって、無段変速機２Ｂの入力側やエンジン１の回転速度が上昇し、これによって、トルクコンバータ２Ａ内などで撹拌抵抗によって、作動油の昇温が促進される。   As shown in FIG. 2, in the continuously variable transmission 2B, the gear ratio R defined as the ratio of the vehicle speed (output rotation speed) Vsp and the input rotation speed (input rotation speed) Nin is set to the lowest Rl and the highest Rh. However, if the gear ratio R is prohibited from falling below a predetermined gear ratio (regulated gear ratio) Rs, the gear ratio R is controlled between the lowest Rl and the predetermined gear ratio Rs. The larger the gear ratio R, the larger the input rotation speed Nin with respect to the vehicle speed Vsp. Therefore, the input speed of the continuously variable transmission 2B and the rotation speed of the engine 1 increase, which causes agitation resistance in the torque converter 2A and the like. The temperature rise of oil is promoted.

以下の表１は、冷却水の水温Ｔｗ及び作動油の温度Ｔoiと、変速制限及び熱交換の制御態様との関係を示している。

Figure 2020079622
Table 1 below shows the relationship between the water temperature Tw of the cooling water and the temperature Toi of the hydraulic oil, and the control modes of gear shift limitation and heat exchange.
Figure 2020079622

表１に示すように、本装置では、ＡＴＣＵ１０は、冷却水の水温Ｔｗが基準水温（第３設定値）Ｔws以下の暖機完了前であることを前提条件に、作動油の温度Ｔoiが第１設定値Ｔos１以下である場合に、無段変速機２Ｂが所定変速比Ｒｓ以下となることを禁止する変速制限（変速比規制）を行って作動油を昇温する。   As shown in Table 1, in this device, the ATCU 10 sets the temperature Toi of the hydraulic oil to the first value under the condition that the cooling water temperature Tw is not higher than the reference water temperature (third set value) Tws and is not yet warmed up. When it is 1 set value Tos1 or less, the continuously variable transmission 2B is subjected to a gear shift restriction (gear ratio regulation) that prohibits the continuously variable transmission 2B from becoming equal to or less than the predetermined gear ratio Rs to raise the temperature of the hydraulic oil.

ただし、作動油の温度Ｔoiが第１設定値Ｔos１以下（中低温域）であっても、所定条件下、即ち、作動油の温度Ｔoiが第１設定値Ｔos１よりも低く且つ第２設定値Ｔos２よりも大きく（中温域）且つ冷却水の水温Ｔｗが作動油の温度Ｔoiよりも高い条件が成立すると、変速制限は行わないで（変速制限を禁止する（「規制なし」とする））熱交換器５を用いて作動油を昇温する。   However, even if the temperature Toi of the hydraulic oil is equal to or lower than the first set value Tos1 (mid-low temperature range), the temperature Toi of the hydraulic oil is lower than the first set value Tos1 and the second set value Tos2. If the condition that the water temperature Tw of the cooling water is higher than the temperature Toi of the hydraulic oil is satisfied (medium temperature range) is higher than the temperature Toi of the hydraulic oil, the heat exchange is not performed (the shift limitation is prohibited (there is no regulation)). The temperature of the hydraulic oil is raised using the vessel 5.

作動油の温度Ｔoiが第１設定値Ｔos１よりも大きい場合は、変速制限を禁止する（「規制なし」とする）。この場合、作動油が十分な温度に昇温しているので、これ以上昇温する必要はなく、通常は、作動油の温度Ｔoiが冷却水の水温Ｔｗを上回るようになり、作動油は、熱交換器５を通過することにより冷却水によって冷却される。   When the temperature Toi of the hydraulic oil is higher than the first set value Tos1, the shift limitation is prohibited (“no regulation” is set). In this case, since the temperature of the hydraulic oil has risen to a sufficient temperature, it is not necessary to raise the temperature anymore, and normally the temperature Toi of the hydraulic oil exceeds the water temperature Tw of the cooling water, and the hydraulic oil is As it passes through the heat exchanger 5, it is cooled by cooling water.

第１設定値Ｔos１は、一例として１２０℃（変速機の通常使用温度域の下限温度）であり、第２設定値Ｔos２は一例として極低温である−２０°であるものとする。
また、基準水温（第３設定値）Ｔwsは駆動源がエンジン（内燃機関）１であるのでエンジン１の暖機完了判定温度（例えば９０℃）としているが、駆動源がモータである場合は冷却用流体の流動性が良くなる温度、つまり、油であれば粘度が所定値以下になる温度であり、水であれば確実に凍らなくなる温度とする。 For example, the first set value Tos1 is 120° C. (lower limit temperature of the normal operating temperature range of the transmission), and the second set value Tos2 is −20° which is an extremely low temperature.
Further, the reference water temperature (third set value) Tws is set as the warm-up completion determination temperature (for example, 90° C.) of the engine 1 because the drive source is the engine (internal combustion engine) 1, but is cooled when the drive source is a motor. The temperature at which the fluidity of the working fluid becomes good, that is, the temperature at which the viscosity becomes a predetermined value or less for oil, and the temperature at which it does not freeze if water is set.

また、暖機完了前であることを前提条件に、作動油の温度Ｔoiが第２設定値Ｔos２以下（低温域）にある場合には、冷却水の水温Ｔｗと作動油の温度Ｔoiとの関係に関わらず変速制限を実施する。エンジン１の暖機完了後に作動油の温度Ｔoiが第２設定値Ｔos２以下（低温域）にある場合には、変速制限は行わないで熱交換器５を用いて作動油を昇温する。   If the temperature Toi of the hydraulic oil is equal to or lower than the second set value Tos2 (low temperature range) on the precondition that the warm-up is not completed, the relationship between the water temperature Tw of the cooling water and the temperature Toi of the hydraulic oil. Regardless of the gear shift restriction. When the temperature Toi of the hydraulic oil is equal to or lower than the second set value Tos2 (low temperature range) after the warm-up of the engine 1 is completed, the heat exchanger 5 is used to raise the temperature of the hydraulic oil without restricting the shift.

本実施形態にかかる上記のように構成されているので、例えば図３に示すように、作動油の温度Ｔoiの消音のための制御冷却水の水温Ｔｗを行うことができる。   With the above-described configuration according to the present embodiment, as shown in FIG. 3, for example, the water temperature Tw of the control cooling water for silencing the temperature Toi of the hydraulic oil can be set.

図３に示すように、まず、冷却水の水温Ｔｗが基準水温Ｔws以下の暖機完了前であるか否かを判定する（ステップＳ１０）。ここで、暖機完了前でなければ（即ち、暖機完了後であれば）、規制なし、即ち変速制限は行わない（ステップＳ２０）。   As shown in FIG. 3, first, it is determined whether or not the cooling water temperature Tw is equal to or lower than the reference water temperature Tws and has not yet been warmed up (step S10). Here, if the warm-up is not completed (that is, after the warm-up is completed), there is no regulation, that is, the shift limitation is not performed (step S20).

暖機完了前であれば、作動油の温度Ｔoiが第１設定値Ｔos１以下（中低温域）であるか否かを判定する（ステップＳ３０）。ここで、作動油の温度Ｔoiが第１設定値Ｔos１以下（中低温域）でなければ（即ち、高温領域であれば）、規制なし、即ち変速制限は行わない（ステップＳ２０）。   If the warm-up has not been completed, it is determined whether or not the temperature Toi of the hydraulic oil is equal to or lower than the first set value Tos1 (mid-low temperature range) (step S30). Here, if the temperature Toi of the hydraulic oil is not equal to or lower than the first set value Tos1 (middle temperature range) (that is, if it is a high temperature range), there is no regulation, that is, shift restriction is not performed (step S20).

作動油の温度Ｔoiが第１設定値Ｔos１以下（中低温域）であれば、次に、作動油の温度Ｔoiが第２設定値Ｔos２よりも大きい（中温域）か否かを判定する（ステップＳ４０）。ここで、作動油の温度Ｔoiが第２設定値Ｔos２よりも高くなければ（低温域であれば）、変速規制、即ち変速制限を行う（ステップＳ５０）。   If the temperature Toi of the hydraulic oil is equal to or lower than the first set value Tos1 (mid-low temperature range), then it is determined whether the temperature Toi of the hydraulic oil is higher than the second set value Tos2 (mid-temperature range) (step). S40). Here, if the temperature Toi of the hydraulic oil is not higher than the second set value Tos2 (in the low temperature range), shift restriction, that is, shift restriction is performed (step S50).

作動油の温度Ｔoiが第２設定値Ｔos２よりも高ければ（中温域であれば）、冷却水の水温Ｔｗが作動油の温度Ｔoiよりも高いか否かを判定する（ステップＳ６０）。ここで、却水の水温Ｔｗが作動油の温度Ｔoiよりも高ければ、規制なし、即ち変速制限は行わないで熱交換器５を用いた熱交換により作動油を昇温する（ステップＳ７０）。一方、却水の水温Ｔｗが作動油の温度Ｔoiよりも高くなければ、変速規制、即ち変速制限を行う（ステップＳ５０）。   If the temperature Toi of the hydraulic oil is higher than the second set value Tos2 (in the middle temperature range), it is determined whether or not the water temperature Tw of the cooling water is higher than the temperature Toi of the hydraulic oil (step S60). Here, if the water temperature Tw of the waste water is higher than the temperature Toi of the hydraulic oil, the hydraulic oil is heated by heat exchange using the heat exchanger 5 without restriction, that is, without restricting the shift (step S70). On the other hand, if the water temperature Tw of the waste water is not higher than the temperature Toi of the hydraulic oil, shift regulation, that is, shift limitation is performed (step S50).

本装置によれば、このような制御によって、油温Ｔoiが通常使用温度域以下の状態において、作動油の温度Ｔoiが第１設定値Ｔos１以下（中低温域）の場合には、作動油の温度Ｔoiを昇温させる制御を実施するので、作動油の温度Ｔoiが速やかに昇温して、作動油の粘性が高く作動油の供給速度の低下や摺動摩擦抵抗の増大を招く状況を速やかに解消することができる。これにより、自動変速機２の変速応答性の低下を抑制して、車両の運転性能の低下を抑制することができる。   According to the present device, by such control, when the temperature Toi of the hydraulic oil is equal to or lower than the first set value Tos1 (mid-low temperature range) in the state where the oil temperature Toi is equal to or lower than the normal use temperature range, Since the control for raising the temperature Toi is carried out, the temperature Toi of the hydraulic oil is rapidly raised, and the situation in which the viscosity of the hydraulic oil is high and the supply speed of the hydraulic oil is lowered and the sliding friction resistance is increased promptly. It can be resolved. As a result, it is possible to suppress a decrease in the shift responsiveness of the automatic transmission 2 and a decrease in the driving performance of the vehicle.

特に、変速制限は、作動油の昇温には寄与するものの、変速制御範囲が制限されるため（図２）、規制する分だけ自動変速機２の運転性能が犠牲にされる。この点、本装置では、作動油の温度Ｔoiが第１設定値Ｔos１以下（中低温域）であっても、作動油の温度Ｔoiが第２設定値Ｔos２よりも大きく且つ冷却水の水温Ｔｗが作動油の温度Ｔoiよりも高い場合には、変速制限は行わないで（変速制限を禁止して）熱交換器５を用いて作動油を昇温する。これにより、自動変速機２の運転性能を確保しながら作動油の昇温による車両の運転性能の向上を図ることができる。   In particular, although the shift limitation contributes to the temperature rise of the hydraulic oil, the shift control range is limited (FIG. 2 ), so that the operating performance of the automatic transmission 2 is sacrificed by the amount of the limitation. In this respect, in this device, even if the temperature Toi of the hydraulic oil is equal to or lower than the first set value Tos1 (middle and low temperature range), the temperature Toi of the hydraulic oil is higher than the second set value Tos2 and the water temperature Tw of the cooling water is larger than the second set value Tos2. When the temperature is higher than the temperature Toi of the hydraulic oil, the speed of the hydraulic oil is raised by using the heat exchanger 5 without restricting the shift (prohibiting the restriction of the shift). As a result, the driving performance of the vehicle can be improved by raising the temperature of the hydraulic oil while ensuring the driving performance of the automatic transmission 2.

また、作動油の温度Ｔoiが第１設定値Ｔos１よりも小さい第２設定値Ｔos２以下の極低温の場合は、作動油の昇温が優先され、作動油の温度Ｔoiと冷却水の温度Ｔｗとの関係に関わらず常に変速制限を実行するので、作動油の極低温状態を速やかに脱することができる。   Further, when the temperature Toi of the hydraulic oil is a very low temperature equal to or lower than the second set value Tos2 which is smaller than the first set value Tos1, the temperature rise of the hydraulic oil is prioritized, and the temperature Toi of the hydraulic oil and the temperature Tow of the cooling water are set. Since the shift restriction is always executed regardless of the relationship of (1), the cryogenic state of the hydraulic oil can be quickly released.

また、温度センサ６４，６５の設置場所に応じて装置内での温度ばらつきがあるが、熱交換器５の近傍に温度センサ６４，６５を取り付けることで、温度のずれによる誤差を低減することができる。   Further, although there are temperature variations in the apparatus depending on the installation locations of the temperature sensors 64 and 65, by mounting the temperature sensors 64 and 65 in the vicinity of the heat exchanger 5, it is possible to reduce the error due to the temperature shift. it can.

以上、本発明の実施形態を説明したが、本発明は、その趣旨を逸脱しない範囲で上記実施形態を適宜変更して実施することができる。
例えば、上記実施形態では自動変速機の一例として無段変速機を適用したものを説明したが、本発明は有段変速機に適用してもよい。
この場合、変速制限としては、所定の変速段以上の高速側の変速段への変速を規制すればよい。逆に、変速制限がされていない変速段までは有段変速の実行を許可することにより、変速機の一定の運転性能が確保される。 Although the embodiments of the present invention have been described above, the present invention can be implemented by appropriately modifying the above embodiments without departing from the spirit of the present invention.
For example, although the continuously variable transmission is applied as an example of the automatic transmission in the above embodiment, the present invention may be applied to a stepped transmission.
In this case, as the shift restriction, it is sufficient to restrict the shift to a higher speed gear than a predetermined gear. On the contrary, by permitting the execution of the stepped shift up to the shift stage where the shift is not restricted, a certain operation performance of the transmission is ensured.

１ 駆動源としてエンジン（内燃機関）
２ 自動変速機
２Ａ トルクコンバータ
２Ｂ 無段変速機
３ 冷却水循環回路
４ コントロールバルブユニット４
５ 熱交換器
１０ 制御部としての自動変速機制御ユニット（ＡＴＣＵ）
６４ 油温センサ（第１温度センサ）
６５ 水温センサ（第２温度センサ） 1 Engine (internal combustion engine) as a drive source
2 Automatic transmission 2A Torque converter 2B Continuously variable transmission 3 Cooling water circulation circuit 4 Control valve unit 4
5 Heat exchanger 10 Automatic transmission control unit (ATCU) as a control unit
64 Oil temperature sensor (first temperature sensor)
65 Water temperature sensor (second temperature sensor)

Claims (7)

作動流体が供給される自動変速機と、
冷却用流体が供給される駆動源と、
前記作動流体と前記冷却用流体の熱交換を行う熱交換器と、を有する車両の制御装置であって、
前記作動流体の温度が第１設定値以下である場合に前記自動変速機が所定変速比以下となることを禁止する変速制限を行う制御部を有し、
前記制御部は、前記作動流体の温度が第１設定値以下であっても、前記冷却用流体の温度が前記作動流体の温度よりも高い場合は前記変速制限を解除する
ことを特徴とする車両の制御装置。 An automatic transmission supplied with working fluid,
A drive source to which a cooling fluid is supplied,
A control device for a vehicle, comprising: a heat exchanger that exchanges heat between the working fluid and the cooling fluid,
The automatic transmission has a control unit that restricts shifts when the temperature of the working fluid is equal to or lower than a first set value, and that prohibits the automatic transmission from falling below a predetermined gear ratio;
The vehicle, wherein the control unit releases the shift limitation when the temperature of the cooling fluid is higher than the temperature of the working fluid even if the temperature of the working fluid is equal to or lower than a first set value. Control device. 請求項１において、
前記自動変速機は、無段変速機であり、
前記制御部は、前記変速制限をしている場合に前記所定変速比以上の領域では前記変速制限をしていない場合の変速線と同じ変速線を選択して変速を実行する
ことを特徴とする車両の制御装置。 In claim 1,
The automatic transmission is a continuously variable transmission,
The control unit may perform the shift by selecting the same shift line as the shift line when the shift limit is not applied in a region equal to or higher than the predetermined gear ratio when the shift limit is applied. Vehicle control device. 請求項１において、
前記自動変速機は、有段変速機であり、
前記制御部は、前記変速制限をしている場合には、前記所定変速比以上の変速段間での変速の実行を許可する
ことを特徴とする車両の制御装置。 In claim 1,
The automatic transmission is a stepped transmission,
The control device for a vehicle, wherein the control unit permits execution of a shift between shift stages having a predetermined gear ratio or more when the shift is restricted. 請求項１乃至請求項３の何れか１項において、
前記制御部は、前記作動流体の温度が前記第１設定値よりも低い第２設定値以下の場合は、前記作動流体の温度と前記冷却用流体の温度との関係に関わらず、前記変速制限を実行する
ことを特徴とする車両の制御装置。 In any one of Claim 1 thru|or Claim 3,
When the temperature of the working fluid is equal to or lower than a second set value that is lower than the first set value, the control unit limits the shift regardless of the relationship between the temperature of the working fluid and the temperature of the cooling fluid. A control device for a vehicle, which executes: 請求項１乃至請求項４のいずれか１項において、
前記制御部は、前記作動流体の温度が前記第１設定値よりも高い場合は前記変速制限を禁止する
ことを特徴とする車両の制御装置。 In any one of Claim 1 thru|or 4,
The control device for a vehicle, wherein the control unit prohibits the shift limitation when the temperature of the working fluid is higher than the first set value. 請求項１乃至請求項５のいずれか１項において、
前記制御部は、前記冷却用流体の温度が第３設定値よりも高い場合は前記変速制限を禁止する
ことを特徴とする車両の制御装置。 In any one of Claim 1 thru|or Claim 5,
The control device for a vehicle, wherein the control unit prohibits the shift limitation when the temperature of the cooling fluid is higher than a third set value. 請求項１乃至請求項６のいずれか１項において、
前記作動流体の温度を検知する第１温度センサを前記熱交換器近傍に取り付け、
前記冷却用流体の温度を検知する第２温度センサを前記熱交換器近傍に取り付けた
ことを特徴とする車両の制御装置。 In any one of Claim 1 thru|or Claim 6,
A first temperature sensor for detecting the temperature of the working fluid is attached near the heat exchanger,
A control device for a vehicle, wherein a second temperature sensor for detecting the temperature of the cooling fluid is attached near the heat exchanger.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6188065A (en) * 1984-10-04 1986-05-06 Toyota Motor Corp Speed ratio control method for stepless speed change gear for car
JP2002130452A (en) * 2000-10-24 2002-05-09 Honda Motor Co Ltd Control device for vehicular hydraulically operable transmission
JP2010053772A (en) * 2008-08-28 2010-03-11 Nissan Motor Co Ltd Warming-up control device of vehicle
JP2011094643A (en) * 2009-10-27 2011-05-12 Jatco Ltd Automatic transmission and protection method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6188065A (en) * 1984-10-04 1986-05-06 Toyota Motor Corp Speed ratio control method for stepless speed change gear for car
JP2002130452A (en) * 2000-10-24 2002-05-09 Honda Motor Co Ltd Control device for vehicular hydraulically operable transmission
JP2010053772A (en) * 2008-08-28 2010-03-11 Nissan Motor Co Ltd Warming-up control device of vehicle
JP2011094643A (en) * 2009-10-27 2011-05-12 Jatco Ltd Automatic transmission and protection method thereof

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