WO2018124022A1 - 無段変速機の制御装置及び無段変速機の制御方法 - Google Patents
無段変速機の制御装置及び無段変速機の制御方法 Download PDFInfo
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- WO2018124022A1 WO2018124022A1 PCT/JP2017/046544 JP2017046544W WO2018124022A1 WO 2018124022 A1 WO2018124022 A1 WO 2018124022A1 JP 2017046544 W JP2017046544 W JP 2017046544W WO 2018124022 A1 WO2018124022 A1 WO 2018124022A1
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- control
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- continuously variable
- variable transmission
- operation amount
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
- F16H61/662—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members
- F16H61/66254—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members controlling of shifting being influenced by a signal derived from the engine and the main coupling
- F16H61/66259—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members controlling of shifting being influenced by a signal derived from the engine and the main coupling using electrical or electronical sensing or control means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
- F16H61/662—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members
- F16H61/66231—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members controlling shifting exclusively as a function of speed
- F16H61/66236—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members controlling shifting exclusively as a function of speed using electrical or electronical sensing or control means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/02—Selector apparatus
- F16H59/04—Ratio selector apparatus
- F16H59/06—Ratio selector apparatus the ratio being infinitely variable
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H59/38—Inputs being a function of speed of gearing elements
- F16H59/40—Output shaft speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H59/00—Control inputs to control units of change-speed-, or reversing-gearings for conveying rotary motion
- F16H59/36—Inputs being a function of speed
- F16H59/44—Inputs being a function of speed dependent on machine speed of the machine, e.g. the vehicle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/02—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by the signals used
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
- F16H61/662—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H2061/0075—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing characterised by a particular control method
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
- F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
- F16H2061/6604—Special control features generally applicable to continuously variable gearings
- F16H2061/6615—Imitating a stepped transmissions
Definitions
- the present invention relates to a continuously variable transmission control device and a continuously variable transmission control method.
- a continuously variable transmission equipped with a primary pulley and a secondary pulley and a belt wound around them is known.
- the target rotational speed of the primary pulley (target primary rotational speed) is set from the vehicle speed detected based on the shift map and the accelerator opening (or output request), and the primary pulley rotational speed is The pulley thrust is feedback controlled so as to achieve this target primary rotational speed.
- the target gear ratio corresponds to the target primary rotation speed.
- low return control is performed to control the gear ratio to the low side (Low side) with a large value in preparation for a re-start from the subsequent stop.
- the target gear ratio is set toward the low side (for example, the lowest), and the thrust of the pulley is feedback-controlled so that the actual gear ratio becomes the target gear ratio.
- Patent Document 1 as a technique for suppressing overshoot of a control target parameter due to accumulation of an integral operation amount related to feedback control, the value corresponding to the integral operation amount is set to zero when the control deviation becomes zero. Techniques to do this are disclosed.
- An object of the present invention is to provide a continuously variable transmission control device and a continuously variable transmission control method capable of preventing overshooting and maintaining a thrust balance appropriately.
- a control device for a continuously variable transmission comprises a primary pulley, a secondary pulley, and a belt wound around both pulleys.
- a control device for a transmission wherein low return control is performed by feedback control using an integral operation amount, wherein the speed ratio of the continuously variable transmission is controlled to a low target speed ratio during deceleration of the vehicle. And when the speed ratio reaches the target speed ratio during the low return control, the speed ratio is determined based on a thrust balance between the primary pulley and the secondary pulley. It is characterized in that the restriction control for restricting the integral operation amount is performed so as to maintain the target transmission speed ratio.
- the control means restricts the integral operation amount by giving a restriction limit value, and restricts the integral operation amount stepwise at the start of the restriction control. And then giving the restriction limit value so as to approach the balance thrust state where the difference in thrust between the two pulleys becomes zero, and the balance thrust state is maintained when the balance thrust state is achieved. It is preferable to provide a limit value.
- control unit cancels the restriction of the integral operation amount when there is a release request for releasing the restriction of the integral operation amount during execution of the restriction control.
- the control means determines that the release request has been made.
- the control means determines that the release request has been made when an actual transmission ratio of the continuously variable transmission is shifted to a high side.
- the gear ratio is prevented from overshooting due to the accumulation of the integral operation amount, and the integral operation amount is regulated based on the thrust balance. Therefore, it is possible to prevent the gear ratio from being changed due to the thrust balance being lost.
- FIG. 1 is a schematic configuration diagram of a drive system of a vehicle to which a continuously variable transmission and a control device thereof according to an embodiment of the present invention are applied. It is a time chart explaining the control by the control apparatus of the continuously variable transmission which concerns on one Embodiment of this invention, and its effect, Comprising: (a) shows the thing at the time of not applying this control, (b) is this control Indicates the case where is applied. It is a flowchart explaining control by the control apparatus of the continuously variable transmission which concerns on one Embodiment of this invention.
- FIG. 1 shows a schematic configuration of a drive system of a vehicle 1 to which a continuously variable transmission and a control device thereof according to this embodiment are applied.
- the drive system of the vehicle 1 includes an engine 2 as a drive source, a torque converter 4 with a lock-up clutch 41, a forward / reverse switching mechanism 5, and a variator (none) from the upstream side of the power transmission path.
- the torque converter 4, the forward / reverse switching mechanism 5, and the variator 6 constitute a continuously variable transmission (CVT) 3.
- CVT continuously variable transmission
- An oil pump 10 and a hydraulic circuit 20 are provided to supply hydraulic oil to the oil chambers of the lockup clutch 41, the forward / reverse switching mechanism 5 and the variator 6 of the CVT 3. Further, a CVTCU (CVT control unit) 30 as a control means is provided in order to control these devices 41, 5, 6 of the CVT 3 through the hydraulic circuit 20. Further, an ECU (Engine Control Unit) 40 is provided to control the engine 2.
- each of the CVTCU 30 and the ECU 40 includes a CPU, a RAM, a ROM, an input / output interface, and the like. Information is transmitted between the CVTCU 30 and the ECU 40.
- the oil pump 10 is driven using a part of the output of the engine 2.
- Engine 2 is an internal combustion engine that uses gasoline or light oil as fuel, and the rotational speed, torque, and the like are controlled based on commands from ECU 40.
- the rotation of the engine 2 is shifted by the variator 6 and transmitted to the left and right drive wheels 9 via the reduction gear train 7 and the differential unit 8.
- the torque converter 4 amplifies the torque input from the engine 2 by the torque amplification action when the lockup clutch 41 is not engaged, and outputs the torque when the lockup clutch 41 is engaged. Transmits rotation without loss.
- the engagement state of the lockup clutch 41 is controlled by adjusting the hydraulic pressure PLU supplied from the hydraulic circuit 20.
- the forward / reverse switching mechanism 5 includes a forward clutch that is engaged during forward travel and a reverse clutch that is engaged during backward travel, both of which are hydraulic multi-plate clutches that adjust the hydraulic pressure PCL supplied from the hydraulic circuit 20. By doing so, the torque capacity (the maximum value of torque that can be transmitted, also referred to as transmission capacity) can be controlled.
- the reverse clutch When the reverse clutch is engaged, the rotation of the engine 2 is reversed and input to the variator 6.
- the variator 6 is a belt-type continuously variable transmission mechanism including a primary pulley 61 and a secondary pulley 62 and a belt 63 wound around the pair of pulleys 61 and 62.
- Each pulley 61, 62 includes a fixed sheave 61a, 62a and a movable sheave 61b, 62b.
- the movable sheaves 61b and 62b clamp the belt 63 to each oil chamber (primary oil chamber and secondary oil chamber, both of which are not shown) by a thrust according to the hydraulic pressure supplied from the hydraulic circuit 20, and the difference between the thrusts.
- the hydraulic circuit 20 adjusts the hydraulic pressure supplied to the lockup clutch 41, the forward clutch, the variator 6 and the like using the hydraulic pressure generated by the oil pump 10 as a source pressure, and supplies the adjusted hydraulic pressure to each part. Thereby, each state of the lockup clutch 41 and the forward / reverse switching mechanism 5 and the gear ratio of the variator 6 are changed.
- the CVTCU 30 sets a target speed ratio Rt based on vehicle travel information such as the vehicle speed Vsp detected by the vehicle speed sensor 21 and the accelerator opening APO detected by the accelerator opening sensor 22 when shifting the variator 6.
- the speed ratio is feedback-controlled by PID control or PI control so that the actual speed ratio Rr becomes the target speed ratio Rt.
- the CVTCU 30 calculates the control amount Ro based on the deviation ⁇ R between the target speed ratio Rt and the actual speed ratio Rr.
- ⁇ R Rt ⁇ Rr
- Ro K1 ⁇ R + ⁇ K2 ⁇ R + K3d ⁇ R / dt (2)
- the thrust for clamping the belt 63 is adjusted by the secondary pressure applied to the oil chamber of the secondary pulley 62, and the thrust balance with the secondary pressure of the secondary pulley 62 is adjusted by the primary pressure applied to the oil chamber of the primary pulley 61.
- the gear ratio is changed (shift).
- the CVTCU 30 performs low return control for shifting the variator 6 to the low side so that the vehicle can be restarted well immediately before the vehicle stops.
- This low return control is performed on the condition that, based on information from the accelerator opening sensor 22 and the brake sensor 23, for example, the vehicle speed Vsp drops below a certain vehicle speed when the accelerator is off and the brake is on.
- the low-side target target gear ratio (for example, the lowest) is set, and the target gear ratio Rt for each control cycle is given toward the target target gear ratio.
- the actual speed ratio Rr is feedback controlled. Note that the low return control is canceled by brake-off or accelerator-on.
- FIG. 2 (a) is a time chart for explaining this problem.
- the target speed ratio Rt is quickly approached to the ultimate target speed ratio Rtt.
- the difference between the actual speed ratio Rr and the target speed ratio Rt becomes large, the target speed ratio Rt reaches the ultimate target speed ratio Rtt at time t2, and the integral operation amount CVint is provided at time t3 thereafter.
- the integral operation amount CVint reaches the upper limit value CVint_up, is regulated by the upper limit value CVint_up, and then the actual speed ratio Rr finally reaches the ultimate target speed ratio Rtt at time t4.
- the accelerator is depressed at time t5 without stopping the vehicle, the low return control is canceled, and the shift to the normal shift control is performed, and the target speed ratio Rt is also changed to the high side, but the actual speed ratio Rr is After waiting for the accumulation of the integral operation amount CVint to be canceled, the change to the high side is started with a great lag with respect to the change of the target gear ratio Rt. Therefore, the gear ratio cannot be changed according to the target, and the shift feeling is lowered.
- the CVTCU 30 is in a state where the differential thrust is zero based on the thrust balance of the primary pulley 61 and the secondary pulley 62 when the actual speed ratio Rr reaches the target speed ratio Rtt during the low return control. Restriction control is performed to restrict the integral operation amount CVint so that the balance thrust state is maintained and the actual transmission gear ratio Rr maintains the final target transmission gear ratio Rtt.
- a restriction value CVint_lim for restriction is given to restrict the magnitude of the integral operation amount CVint.
- a restriction limit value CVint_lim is given so that the integral operation amount CVint decreases stepwise, and then the thrust of the secondary pulley 62 and the primary pulley 61 are given.
- difference thrust 0
- the restriction value CVint_lim for regulation is gradually decreased so that the differential thrust approaches the balance thrust state. As a result, a change in the gear ratio due to a sudden change in the integral operation amount CVint is suppressed.
- the thrusts of the primary pulley 61 and the secondary pulley 62 correspond to the pressures (primary pressure and secondary pressure) in the oil chambers 61 and 62, so the primary pressure and the secondary pressure are detected by the primary pressure sensor 24 and the secondary pressure sensor 25. And the differential thrust can be obtained from this detection information. When there is no primary pressure sensor or secondary pressure sensor, an estimated value of the differential thrust can be calculated from the control instruction value.
- the downshift side thrust generated by the shift operation is reduced.
- the restriction limit value CVint_lim is decreased (increase the limit) so that the downshift side thrust is decreased toward the balance thrust state, and when the difference thrust reaches the balance thrust state at time t14,
- the restriction value CVint_lim for regulation is given so as to maintain the balance thrust state.
- the restriction limit value CVint_lim that holds this balance thrust state is in the vicinity of a low level of the integral operation amount CVint, but is not necessarily the zero level of the integral operation amount CVint.
- the limitation of the integral operation amount CVint by the present control device is only for setting the differential thrust to the balance thrust state and holding it, and the restriction limit value CVint_lim is set based on the differential thrust.
- the integral operation amount CVint is simply reset to 0, the differential thrust cannot be controlled to the balanced thrust state, and the gear ratio may not be stable.
- the accelerator is depressed at time t15 without stopping the vehicle, the low return control is canceled, and the shift to the normal shift control is performed, and the target gear ratio Rt is also changed to the high side.
- the cumulative operation amount CVint is little accumulated, the actual speed ratio Rr immediately follows the change of the target speed ratio Rt and starts changing to the high side. Therefore, the transmission ratio can be changed according to the target, and the transmission feeling can be improved.
- CVTCU 30 if there is a release request for releasing the restriction on the integral operation amount during the restriction control, the restriction on the integral operation amount CVint is released.
- the release request may include a downshift request for CVT3 or the actual gear ratio Rr of CVT3 shifted to the high side. If any of these occurs, the restriction on the integral operation amount CVint is released. That is, the CVTCU 30 determines that there is a cancel request when there is a downshift request for the CVT 3, and determines that there is a cancel request when the actual gear ratio Rr of the CVT 3 shifts to the high side, and also requests a reacceleration to the vehicle. If there is, it is determined that there is a release request, and the restriction control is released.
- the restriction control of the integral operation amount CVint in the low return control is performed as shown in the flowchart of FIG. .
- This flow is performed at a predetermined control period during the low return control.
- F in the flowchart of FIG. 3 is a flag relating to the restriction control of the integral operation amount CVint, and is set to 1 during the restriction control, and is set to 0 otherwise.
- step S10 it is determined whether or not the flag F is 0 (step S10). If the flag F is 0, that is, if the restriction control of the integral operation amount CVint is not performed, it is next determined whether or not the low return is completed (step S20). In the low return control, feedback control is performed with the actual speed ratio toward the low target speed ratio. When the actual speed ratio reaches the target speed ratio, it is determined that the low return has been completed. If it is not determined that the low return has been completed (NO determination in step S20), the process of the current control cycle is terminated.
- step S20 If it is determined that the low return has been completed (YES in step S20), a differential thrust between the thrust of the secondary pulley 62 and the thrust of the primary pulley 61 is calculated (step S30). Then, it is determined whether or not this differential thrust is a differential thrust toward the low side (step S40). If the differential thrust is a differential thrust toward the low side (YES in step S40), the flag F is set to 1 (step S50), and the restriction control is performed to regulate the integral operation amount CVint based on the thrust balance (step S50). Step S60). If the low return is not completed, or the low return is completed but the differential thrust is not the differential thrust toward the low side (NO determination in step S40), the process of the current control cycle is terminated.
- step S10 determines whether or not a downshift is requested. If the final target speed ratio is the lowest, a downshift is not required. However, since the target target speed ratio is not always the lowest in the low return control, a downshift may be required.
- step S80 it is determined whether the gear ratio has shifted to the high side (step S80). For example, when the accelerator pedal is depressed, the target gear ratio is shifted to the high side, and the actual gear ratio is also shifted to the high side following this. Alternatively, the actual gear ratio is shifted to the high side even when the restriction control is applied and the high-side differential thrust is generated.
- step S90 When a downshift is requested (when a low-side target gear ratio is set) or when the gear ratio is shifted to the high side, the flag F is reset to 0 (step S90), and the integration operation amount CVint is restricted. Control is released (step S100). If no downshift is required and the gear ratio does not shift to the high side, the restriction control of the integral operation amount CVint is continued (step S60).
- a restriction value CVint_lim for restriction is given to restrict the magnitude of the integral operation amount CVint.
- the limit value CVint_lim for use is given.
- the present invention can be implemented by appropriately changing the embodiment.
- the restriction limit value CVint_lim is given so that the integral operation amount CVint decreases stepwise, and then the restriction limit value CVint_lim is given so that the differential thrust approaches the balance thrust state.
- the present invention is not limited to this, and the restriction limit value CVint_lim may be given so that the differential thrust approaches the balance thrust state from the start of the regulation control.
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Abstract
Description
(5)前記制御手段は、前記無段変速機の実変速比がハイ側にシフトすると、前記解除要求があったと判定することが好ましい。
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共に、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。
図1は、本実施形態に係る無段変速機及びその制御装置が適用される車両1の駆動系の概略構成を示している。図1に示すように、車両1の駆動系は、動力伝達経路の上流側から、駆動源であるエンジン2と、ロックアップクラッチ41付きのトルクコンバータ4と前後進切替機構5と、バリエータ(無段変速機構)6と、減速ギヤ列7と、ディファレンシャルユニット8と、駆動輪9とを備えている。トルクコンバータ4と前後進切替機構5とバリエータ6とから、無段変速機(CVT)3が構成される。
また、オイルポンプ10は、エンジン2の出力の一部を利用して駆動される。
△R=Rt-Rr ・・・(1)
Ro=K1△R+∫K2△R+K3d△R/dt・・・(2)
K1:比例ゲイン
K2:積分ゲイン
K3:微分ゲイン
また、CVTCU30は、車両の停止直前には、再発進を良好に行なえるように、バリエータ6をロー側に変速させるロー戻し制御を行う。このロー戻し制御は、例えばアクセル開度センサ22及びブレーキセンサ23からの情報に基づいて、アクセルオフで且つブレーキオンの制動時に車速Vspが一定車速以下に低下したことを条件に実施する。このロー戻し制御においても、ロー側の到達目標変速比(例えば最ロー)を設定し、到達目標変速比に向けて各制御周期毎の目標変速比Rtを与えては、PID制御又はPI制御によって実変速比Rrをフィードバック制御する。なお、ロー戻し制御は、ブレーキオフ又はアクセルオンで解除される。
つまり、CVTCU30では、CVT3に対するダウンシフト要求があると解除要求があったと判定し、また、CVT3の実変速比Rrがハイ側にシフトすると解除要求があったと判定し、また、車両に対する再加速要求があると解除要求があったと判定し、それぞれ規制制御を解除する。
本発明の一実施形態にかかる無段変速機の制御装置は、上述のように構成されているので、ロー戻し制御における積分操作量CVintの規制制御は、図3のフローチャートに示すように行なわれる。このフローは、ロー戻し制御中に、所定の制御周期で実施される。なお、図3のフローチャート中のFは積分操作量CVintの規制制御に関するフラグであり、規制制御中には1とされ、そうでなければ0とされる。
到達目標変速比が最ローであればダウンシフトが要求されることはないが、ロー戻し制御において到達目標変速比が最ローとは限らないので、ダウンシフトが要求されることもある。
ダウンシフトが要求されず変速比がハイ側にシフトすることもなければ、積分操作量CVintの規制制御が続行される(ステップS60)。
また、その後の再加速要求等に対しても速やかに適正な変速比制御を実現することができる。したがって、目標に沿った変速比の変更ができ、変速フィーリングが向上することになる。
例えば、上記実施形態では、規制制御の開始時には積分操作量CVintがステップ状に減少するように規制用制限値CVint_limを与え、その後差推力がバランス推力状態に近づくように規制用制限値CVint_limを与えており、速やかにバランス推力状態に近づくが、これに限られず、規制制御の開始時から差推力がバランス推力状態に近づくように規制用制限値CVint_limを与えてもよい。
Claims (7)
- プライマリプーリとセカンダリプーリとこれら両プーリに巻き掛けられたベルトとからなり、車両に装備された無段変速機の制御装置であって、
前記車両の減速中に前記無段変速機の変速比をロー側の到達目標変速比に変速制御するロー戻し制御を、積分操作量を用いたフィードバック制御によって実施する制御手段を有し、
前記制御手段は、前記ロー戻し制御中に前記変速比が前記到達目標変速比に到達したら、前記プライマリプーリ及び前記セカンダリプーリの推力バランスに基づいて、前記変速比が前記到達目標変速比を保持するように前記積分操作量を規制する規制制御を実施する、無段変速機の制御装置。 - 前記制御手段は、前記規制制御では、規制用制限値を与えて前記積分操作量を規制し、
前記規制制御の開始時には、前記積分操作量がステップ状に減少するように前記規制用制限値を与え、
その後、前記両プーリの推力の差分がゼロとなるバランス推力状態に近づけるように前記規制用制限値を与え、
前記バランス推力状態が達成されたら、このバランス推力状態を保持するように前記規制用制限値を与える、請求項1に記載の無段変速機の制御装置。 - 前記制御手段は、前記規制制御の実施中に、前記積分操作量の規制を解除する解除要求があると、前記積分操作量の規制を解除する、請求項1又は2に記載の無段変速機の制御装置。
- 前記制御手段は、前記無段変速機に対するダウンシフト要求があると、前記解除要求があったと判定する、請求項3に記載の無段変速機の制御装置。
- 前記制御手段は、前記無段変速機の実変速比がハイ側にシフトすると、前記解除要求があったと判定する、請求項3又は4に記載の無段変速機の制御装置。
- プライマリプーリとセカンダリプーリとこれら両プーリに巻き掛けられたベルトとからなり、車両に装備された無段変速機に対して、前記車両の減速中に前記無段変速機の変速比をロー側の到達目標変速比に変速制御するロー戻し制御を、積分操作量を用いたフィードバック制御によって実施する無段変速機の制御方法であって、
前記ロー戻し制御中に前記変速比が前記到達目標変速比に到達したら、前記プライマリプーリ及び前記セカンダリプーリの推力バランスに基づいて、前記変速比が前記到達目標変速比を保持するように前記積分操作量を規制する規制制御を実施する、無段変速機の制御方法。 - 前記規制制御では、規制用制限値を与えて前記積分操作量を規制し、
前記規制制御の開始時には、前記積分操作量がステップ状に減少するように前記規制用制限値を与え、
その後、前記両プーリの推力の差分がゼロとなるバランス推力状態に近づけるように前記規制用制限値を与え、
前記バランス推力状態が達成されたら、このバランス推力状態を保持するように前記規制用制限値を与える、請求項6に記載の無段変速機の制御方法。
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