WO2012098757A1 - 無段変速機の変速制御装置及び制御方法 - Google Patents
無段変速機の変速制御装置及び制御方法 Download PDFInfo
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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
- 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
- F16H9/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members
- F16H9/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion
- F16H9/04—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes
- F16H9/12—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members
- F16H9/125—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by endless flexible members without members having orbital motion using belts, V-belts, or ropes engaging a pulley built-up out of relatively axially-adjustable parts in which the belt engages the opposite flanges of the pulley directly without interposed belt-supporting members characterised by means for controlling the geometrical interrelationship of pulleys and the endless flexible member, e.g. belt alignment or position of the resulting axial pulley force in the plane perpendicular to the pulley axis
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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
- F16H59/68—Inputs being a function of gearing status
- F16H59/70—Inputs being a function of gearing status dependent on the ratio established
- F16H2059/704—Monitoring gear ratio in CVT's
Definitions
- This invention relates to a shift control of a continuously variable transmission using an endless torque transmission member such as a chain.
- a continuously variable transmission using an endless torque transmission member such as a chain
- the elongation of the endless torque transmission member affects the shift control.
- the chain is stretched in a state where the winding radius of the primary pulley is fixed, the winding radius of the secondary pulley increases, and the gear ratio changes to the increasing side, so-called low side.
- JP08-327857A issued by the Japan Patent Office in 1996, teaches that the deviation between the target gear ratio and the actual gear ratio is solved by gear ratio feedback control using proportional integral (PI) control.
- PI proportional integral
- the target speed ratio may not be achieved. If the target gear ratio cannot be achieved, the feedback correction amount is accumulated in order to eliminate the gear ratio deviation in the feedback control. For this reason, a response to the gear ratio control is delayed when the target gear ratio is changed to a high gear ratio that can be realized later.
- an object of the present invention is to eliminate the response delay of the gear ratio feedback control due to the extension of the endless torque transmission member of the CVT.
- the present invention provides a control device for a continuously variable transmission that shifts between a pair of pulleys via an endless torque transmission member wound around the pair of pulleys.
- the control device feedback-controls the transmission gear ratio so that the actual transmission gear ratio between the pair of pulleys follows the target transmission gear ratio, and whether or not the endless torque transmission member is extended cannot reach the target transmission gear ratio of the actual transmission gear ratio.
- a programmable programmable controller is provided to determine whether or not an elongation dependent transmission condition is satisfied, and to limit the transmission ratio feedback control when the elongation dependent transmission condition is satisfied.
- FIG. 1 is a schematic configuration diagram of a control device for a continuously variable transmission according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing characteristics of a target gear ratio map according to the prior art.
- FIG. 3 is a diagram for explaining the influence of the elongation of the V chain on the gear ratio control.
- FIG. 4 is a diagram showing the relationship between the input torque of the primary pulley of the continuously variable transmission and the elongation of the V chain, according to the simulation of the inventors.
- FIG. 5 is a diagram showing the relationship between the thrust of the secondary pulley of the continuously variable transmission and the elongation of the V chain according to the simulations of the inventors.
- FIG. 1 is a schematic configuration diagram of a control device for a continuously variable transmission according to a first embodiment of the present invention.
- FIG. 2 is a diagram showing characteristics of a target gear ratio map according to the prior art.
- FIG. 3 is a diagram for explaining the influence of the elongation of
- FIG. 6 is a diagram showing the relationship between the rotation speed of the primary pulley and the extension of the V-chain according to the simulation of the inventors.
- FIG. 7 is a diagram showing the relationship between the transmission ratio and the elongation of the V chain according to the simulation of the inventors.
- FIG. 8 is a flowchart for explaining an integral term update limiting routine executed by the speed change controller according to the first embodiment of the present invention.
- FIG. 9 is a diagram for explaining a target speed ratio setting region set by the speed change controller.
- FIG. 10 is a flowchart for explaining an integral term update limiting routine executed by the speed change controller according to the second embodiment of the present invention.
- FIG. 11 is a diagram for explaining the characteristics of a thrust ratio map stored in the speed change controller according to the third embodiment of the present invention.
- FIG. 12 is a diagram for explaining a method of setting the secondary balance thrust and the primary balance thrust by the speed change controller according to the third embodiment of the present invention.
- FIG. 13 is a block diagram illustrating a pulley thrust feedback control function of a speed change controller according to a third embodiment of the present invention.
- FIG. 14 is a flowchart for explaining an integral term update limiting routine executed by the speed change controller according to the third embodiment of the present invention.
- FIG. 15A and 15B are timing charts for explaining changes in the transmission gear ratio and pulley thrust due to integral term update restriction executed by the transmission controller according to the third embodiment of the present invention.
- the vehicle drive system includes an internal combustion engine 1 as a travel power source.
- the output rotation of the internal combustion engine 1 is transmitted to the drive wheels 7 via the torque converter 2, the first gear train 3, the continuously variable transmission (hereinafter referred to as CVT) 4, the second gear train 5, and the terminal reduction gear 6. Is done.
- the CVT 4 is constituted by a V chain type continuously variable transmission mechanism.
- the CVT 4 includes a primary pulley 11, a secondary pulley 12, and a V chain 13 as an endless torque transmission member that is wound around the pulleys 11 and 12.
- the V chain 13 has a V-shaped cross section that gradually decreases in width toward the center of the V chain 13.
- the rotation torque of the internal combustion engine 1 is input to the primary pulley 11 via the torque converter 2 and the first gear train 3.
- the V chain 13 transmits the rotational torque of the primary pulley 11 to the secondary 12.
- the rotational torque of the secondary pulley 12 is output to the drive wheel 7 via the second gear train 5 and the terminal reduction device 6.
- the pulleys 11 and 12 are each composed of a fixed sheave and a movable sheave that forms a V-groove with the sheave surface facing the fixed sheave.
- a hydraulic cylinder 15 for displacing the movable sheave in the axial direction is provided on the back surface of the movable sheave of the primary pulley 11.
- a hydraulic cylinder 16 for displacing the movable sheave in the axial direction is provided on the back surface of the movable sheave of the secondary pulley 12.
- the hydraulic cylinders 15 and 16 apply a thrust according to the supplied hydraulic pressure to the movable sheave to change the width of the V groove.
- the “speed ratio” is a value obtained by dividing the rotational speed of the primary pulley 11 by the rotational speed of the secondary pulley 12.
- the thrust that hydraulic cylinders 15 and 16 exert on each movable sheave of primary pulley 11 and secondary pulley 12 is referred to as pulley thrust.
- the shift control of the CVT 4 includes a hydraulic pump 10 that is driven using a part of the power of the internal combustion engine 1, a hydraulic control circuit 21 that regulates the hydraulic pressure from the hydraulic pump 10 and supplies the hydraulic cylinders 15 and 16 with the hydraulic pressure. This is performed by a shift controller 22 that controls the hydraulic control circuit 21.
- the shift controller 22 is composed of a microcomputer having a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and an input / output interface (I / O interface). It is also possible to configure the controller with a plurality of microcomputers.
- CPU central processing unit
- ROM read only memory
- RAM random access memory
- I / O interface input / output interface
- the transmission controller 22 determines a target transmission ratio by a known method based on the load of the internal combustion engine 1 and the vehicle speed, and feedback-controls the transmission ratio of the CVT 4 to the target transmission ratio.
- the shift controller 22 includes an accelerator pedal opening sensor 41 that detects an accelerator pedal opening APO provided in the vehicle as a load of the internal combustion engine 1, an inhibitor switch 45 that detects a selection position of a selector lever provided in the vehicle, and a primary pulley 11.
- Each detection data is input as a signal from the primary rotation sensor 42 that detects the rotation speed Np and the secondary rotation sensor 43 that detects the rotation speed Ns of the secondary pulley 12.
- the speed of the vehicle for determining the target speed ratio can be calculated from the rotational speed Ns of the secondary pulley 12 and the speed reduction ratio of the second gear train 5 and the terminal reduction gear 6.
- the target gear ratio of CVT 4 is generally determined according to the output rotation speed of CVT 4 and the load of internal combustion engine 1.
- the load of the internal combustion engine 1 can be expressed by the accelerator pedal opening APO detected by the accelerator pedal opening sensor 41.
- the input rotation speed of the CVT 4 that is, the target rotation speed of the primary pulley 11 was obtained by referring to the characteristic map shown in FIG. A value obtained by dividing the target rotational speed of the primary pulley 11 by the rotational speed of the secondary pulley 12 is the target gear ratio.
- the target gear ratio in this case is set on the assumption that no elongation occurs in the V chain 13.
- the inventors analyzed the influence of the CVT 4 when the V chain 13 is stretched by simulation under the target gear ratio set based on such a map.
- the simulation results are shown in FIG. 4-FIG. 7 shows.
- the elongation amount of the V chain 13 depends on the tension of the V chain 13. In other words, the extension amount of the V chain 13 and the tension of the V chain 13 are equivalent.
- the tension of the V chain 13 increases the input torque of the primary pulley 11 when the transmission ratio of the primary pulley 11 and the secondary pulley 12, the pulley thrust of the secondary pulley 12, and the rotation speed Np of the primary pulley 11 are constant. It gradually increases as you go.
- the tension of the V chain 13 increases as the pulley thrust of the secondary pulley 12 increases, assuming that the input torque and rotation speed Np of the primary pulley 11 and the gear ratio of the primary pulley 11 and the secondary pulley 12 are constant.
- the tension of the V chain 13 increases as the rotational speed Np of the primary pulley 11 increases when the input torque to the primary pulley 11, the pulley thrust of the secondary pulley 12, and the primary pulley 11 are constant.
- FIG. 7 if the tension of the V chain 13 is constant for the pulley thrust of the secondary pulley 12, the input torque of the primary pulley 11, and the rotational speed Np of the primary pulley 11, the transmission ratio of the primary pulley 11 and the secondary pulley 12 There is a tendency to slightly decrease with increase.
- the error caused by the extension of the V-chain 13 caused by these effects to the transmission ratio control is generally eliminated in the transmission ratio feedback control, and the actual transmission ratio is finally controlled to the target transmission ratio.
- the following phenomenon occurs in the vicinity of the minimum speed ratio and the maximum speed ratio.
- variable sheave of the primary pulley 11 is provided with a stopper at each of the forward position and the backward position.
- the extension of the V chain 13 increases only the wrapping radius of the V chain 13 around the secondary pulley 12. Therefore, the elongation of the V chain 13 is the same as the minimum gear ratio and the maximum gear ratio that the CVT 4 can take. As shown in FIG.
- the gear ratio in the region from the minimum gear ratio without elongation to the minimum gear ratio with elongation in the figure is a gear ratio region where CVT 4 cannot be physically realized when the V chain 13 is elongated.
- the speed ratio in the area between the maximum speed ratio without elongation and the maximum speed ratio with extension in the figure is a speed ratio area in which CVT 4 can be realized by the extension of the V chain 13.
- this area is outside the target speed ratio setting area on the map, the speed ratio in this area is not set to the target speed ratio.
- FIG. 3 a target speed ratio region that cannot be achieved in the vicinity of the minimum speed ratio of the CVT 4 is generated, and a target speed ratio region that is not used in the vicinity of the maximum speed ratio is generated. Narrow.
- a speed ratio region that can be always realized is referred to as a constantly realizable gear ratio region.
- the target gear ratio is set on the premise of the V chain 13 that does not stretch, and proportional integral (PI) control or proportional integral derivative control (PID) is applied to set the actual gear ratio to the target gear ratio.
- proportional integral (PI) control or proportional integral derivative control (PID) is applied to set the actual gear ratio to the target gear ratio.
- the integral term of the feedback control is accumulated until the target gear ratio is reset within the realizable gear ratio region due to changes in the vehicle operating conditions such as the rotational speed Ns of the secondary pulley 12 and the accelerator pedal opening APO. Will do.
- the accumulated integral term is gradually eliminated in the feedback control that is performed when the target gear ratio is reset within the always realizable gear ratio region, so the accumulation of the integral term causes a delay in the gear ratio control. I will let you.
- the transmission controller 22 performs the following control in order to solve the above problems caused by the extension of the V chain 13 to the transmission ratio control.
- the speed change controller 22 determines whether or not the current speed change condition corresponds to an extension-dependent speed change condition in which the presence or absence of the V chain 13 makes it impossible to achieve the target speed ratio. If the speed change controller 22 determines that the current speed change condition corresponds to the stretch-dependent speed change condition, the speed change ratio feedback control is limited. Specifically, in this embodiment, the target gear ratio is FIG. When the actual speed ratio is larger than the target speed ratio, the speed change controller 22 determines that the current speed change condition corresponds to the speed-dependent speed change condition. Judgment is made, and updating of the integral term of PI control or PID control is prohibited.
- FIG. 8 an integral term update restriction routine executed by the speed change controller 22 for this control will be described. This routine is repeatedly executed at regular intervals of, for example, 10 milliseconds while the primary pulley 11 is rotating.
- the target gear ratio is set without considering the elongation of the V chain 13 as in the prior art. That is, the target gear ratio is determined based on the accelerator pedal opening APO and the rotational speed Ns of the secondary pulley 12 as shown in FIG. 2 is read with reference to a map of the target speed ratio Dip having the characteristics shown in FIG.
- a target gear ratio that exceeds the maximum gear ratio without elongation is not set. Therefore, even if the actual speed ratio exceeds the maximum speed ratio without elongation, the actual speed ratio is controlled to the target speed ratio by normal feedback control.
- the target gear ratio is set in a region between the minimum gear ratio with elongation and the minimum gear ratio without elongation, if the V chain 13 is elongated, the actual gear ratio cannot achieve the target gear ratio.
- the integral term of feedback control is accumulated.
- the integral term update restriction routine is executed to prevent a delay in response to a change in the gear ratio that occurs when the target gear ratio is increased and changes to a value larger than the minimum gear ratio as a result of the accumulation of the integral term.
- step S1 of FIG. 8 the transmission controller 22 reads the target transmission ratio Dip and the actual transmission ratio ip.
- the target speed ratio Dip is a value obtained by referring to the target speed ratio Dip map as described above.
- the actual gear ratio ip is a ratio between the rotation speed Np of the primary pulley 11 detected by the primary rotation sensor 42 and the rotation speed Ns of the secondary pulley 12 detected by the secondary rotation sensor 43.
- the transmission controller 22 determines whether or not the actual transmission ratio ip is less than or equal to the minimum transmission ratio threshold value ip_min.
- the minimum speed ratio threshold value ip_min is set in FIG. 2 is set equal to the minimum transmission gear ratio.
- the minimum speed ratio threshold value ip_min may be set to a value slightly larger than the minimum speed ratio with elongation. If the determination in step S2 is affirmative, the actual gear ratio ip is FIG. It is located on the line of the minimum gear ratio with elongation of 2 or on the lower right side thereof. On the other hand, if the determination in step S2 is negative, the gear ratio ip is FIG. It is located on the upper left side of the line of minimum transmission ratio with elongation of 2. In this region, the speed ratio ip can be increased or decreased by feedback control of the speed ratio.
- step S3 the transmission controller 22 determines in step S3 whether the actual transmission ratio ip is greater than the target transmission ratio Dip.
- the actual speed ratio ip is less than or equal to the target speed ratio Dip, the actual speed ratio ip is increased to the target speed ratio Dip by speed ratio feedback control even if the actual speed ratio ip is extended and less than the minimum speed ratio. Can do.
- the actual speed ratio ip is larger than the target speed ratio Dip, the actual speed ratio ip must be further reduced in order to bring the actual speed ratio ip closer to the target speed ratio Dip.
- the actual gear ratio ip is already in FIG.
- step S5 the gear ratio feedback control amount is calculated by applying one of the following control equations.
- the transmission ratio feedback control amount is an update amount of the target transmission ratio.
- Integral term means the second term of the PI control equation and the PID control equation as follows.
- step S5 the transmission controller 22 calculates the transmission ratio feedback control amount and stores the integral term in the RAM.
- step S6 gear ratio feedback control is executed using the gear ratio feedback control amount calculated in step S5. After the process of step S6, the shift controller 22 ends the routine.
- step S3 determines whether the gear ratio feedback control is performed. If the V chain 13 is extended, the actual gear ratio ip cannot reach the target gear ratio Dip. That is, an elongation-dependent shift condition near the minimum speed ratio is established. As a result, when the integral term is accumulated and the target speed ratio Dip is increased and changed to a value larger than the minimum speed ratio, a response delay occurs in the speed ratio change.
- the transmission controller 22 limits the feedback control amount by setting the integral term included in the feedback control amount to a fixed value in step S4, and performs feedback control of the target gear ratio based on the limited value.
- the integral term of the feedback control amount is a time integral value, and continues to increase as long as the deviation between the target gear ratio and the actual gear ratio continues.
- the shift controller 22 prohibits the update of the integral term value stored in the RAM by not performing the process of step S5.
- the integral term stored in the RAM is fixed to a value immediately before the elongation-dependent shift condition near the minimum gear ratio is satisfied.
- the speed change controller 22 calculates the speed ratio feedback control amount using the PI control formula or the PID control formula in step S4, and calculates the feedback control amount by applying the fixed value stored in the RAM to the integral term at that time. Based on the calculation result, feedback control of the gear ratio is executed. After the process of step S4, the shift controller 22 ends the routine.
- step S5 for updating the integral term in the RAM is not executed as long as the stretch-dependent shift condition near the minimum gear ratio is maintained, in which the determinations of steps S2 and S3 are both positive. In other words, as long as the elongation-dependent shift condition near the minimum gear ratio is maintained, the update of the integral term stored in the RAM is prohibited.
- the actual gear ratio ip is FIG. If it is equal to or less than the minimum speed ratio with elongation of 2 and greater than the target speed ratio Dip, it is determined that an elongation-dependent speed condition near the minimum speed ratio that cannot achieve the target speed ratio Dip is satisfied if the V chain 13 is extended. If the elongation-dependent shift condition near the minimum gear ratio is satisfied, updating of the integral term is prohibited in step S4.
- the gear ratio feedback control amount stored in the RAM is stored even if the gear ratio feedback control with the same target gear ratio Dip is continued under the elongation-dependent gear condition in the subsequent routine execution.
- the integral term in does not increase. Therefore, the driving state of the vehicle changes and the target gear ratio becomes FIG.
- the transmission controller 22 can quickly follow the actual transmission ratio ip to the target transmission ratio Dip.
- FIG. 9 and FIG. A second embodiment of the present invention will be described with reference to FIG.
- the target gear ratio is set without considering the elongation of the V chain 13 as in the prior art.
- the target gear ratio Dip is set in consideration of the elongation of the V chain 13. To decide.
- the speed change controller 22 sets the target speed change ratio Dip to FIG. This is determined with reference to the characteristic map shown in FIG. FIG. 9 is FIG. 2 is similar to FIG. 2, the minimum transmission ratio with elongation, the minimum transmission ratio without elongation, the minimum transmission ratio with elongation, and the minimum transmission ratio without elongation are FIG. 2 is the same.
- FIG. 2 the target speed ratio Dip is set between the maximum speed ratio without elongation and the minimum speed ratio without elongation
- FIG. In 9 the target gear ratio is set between the maximum gear ratio with elongation and the minimum gear ratio without elongation.
- the target speed ratio Dip When the target speed ratio Dip is set based on the map of FIG. 9, the speed ratio width can be set wide.
- the minimum speed ratio and the maximum speed ratio cannot be achieved depending on whether or not the V chain 13 is extended. Occurs. That is.
- the target speed ratio Dip in the region between the maximum speed ratio with extension and the maximum speed ratio without extension in the figure cannot be physically achieved.
- the target speed ratio Dip in the region between the stretched minimum speed ratio and the unstretched minimum speed ratio in the figure cannot be physically achieved.
- the speed change controller 22 determines whether or not an extension dependent speed change condition in which the target speed change ratio cannot be physically achieved by the presence or absence of the extension of the V-chain 13 for both speed change conditions near the minimum speed ratio and the maximum speed ratio.
- the update of the integral term is restricted according to the determination result.
- FIG. 10 FIG. An integral term update restriction routine executed by the speed change controller 22 based on the target speed ratio map of 9 will be described.
- FIG. This corresponds to a configuration in which steps S12 and S13 are provided between steps S2, S3 and S5.
- the routine execution conditions are the same as those in the first embodiment.
- step S1 the transmission controller 22 reads the target transmission ratio Dip and the actual transmission ratio ip.
- the target speed ratio Dip is set to FIG. 9 is a value obtained by referring to a map previously stored in the ROM having the characteristics shown in FIG.
- step S3 if the determination in step S3 is affirmative, it means that the current speed change condition corresponds to an elongation-dependent speed change condition near the minimum speed ratio.
- the elongation-dependent shift condition near the minimum gear ratio is satisfied, the actual gear ratio ip cannot reach the target gear ratio Dip if the V chain 13 is extended.
- the shift controller 22 performs feedback control by applying the fixed value stored in the RAM to the integral term in step S4.
- step S2 or step S3 determines in steps S12 and S13 whether or not the current speed change condition corresponds to an elongation dependent speed change condition near the maximum speed change ratio.
- the elongation-dependent transmission condition near the maximum transmission ratio means a transmission condition in which the target transmission ratio Dip cannot be realized unless the V chain 13 is extended.
- step S12 the transmission controller 22 determines whether or not the actual transmission ratio ip is greater than or equal to the maximum transmission ratio threshold ip_max.
- the maximum gear ratio threshold value ip_max is set in FIG. 9 is set equal to the maximum transmission ratio without elongation.
- the maximum speed ratio threshold value ip_max may be set to a value slightly smaller than the maximum speed ratio without elongation in consideration of the influence of hardware variations. If the determination in step S12 is negative, the transmission controller 22 performs normal transmission ratio feedback control to which PI control or PID control is applied in steps S5 and S6.
- step S13 the transmission controller 22 determines whether the actual transmission ratio ip is smaller than the target transmission ratio Dip.
- step S13 If the determination in step S13 is affirmative, the actual gear ratio ip is FIG. This means that it is still smaller than the target speed ratio Dip even though it is located on the line of the maximum speed ratio 9 without extension or on the upper left side thereof. In this case, if the V-chain 13 is not stretched, the actual gear ratio ip cannot reach the target gear ratio Dip simply by integrating the integral term in the normal gear ratio feedback control. On the other hand, as described above, the accumulation of the integral term causes a response delay of the change in the gear ratio when the target gear ratio Dip is changed to a value smaller than the maximum gear ratio without elongation. If the determination in step S13 is affirmative, it means that the current speed change condition corresponds to an elongation-dependent speed change condition near the maximum speed ratio.
- step S13 If the determination in step S13 is negative, the shift controller 22 performs feedback control in step S4 by applying the fixed value stored in the RAM to the integral term as described above.
- step S12 or S13 determines whether the transmission controller 22 is transmitting normal transmission ratio feedback control in steps S5 and S6.
- the target speed ratio Dip can be set widely in a section from the minimum speed ratio when the V chain 13 is not extended to the maximum speed ratio when the V chain 13 is extended.
- an extension-dependent shift condition in which the actual speed ratio ip cannot follow the target speed ratio Dip is determined.
- the integral term of the speed ratio feedback control is updated. Ban. Therefore, according to this embodiment, while the target speed ratio setting range is expanded, response delay due to accumulation of integral terms can be prevented under any of the elongation-dependent speed conditions near the minimum speed ratio and the maximum speed ratio.
- the fixed value is not limited to the integral term immediately before the elongation-dependent shift condition is established.
- a value obtained by adding a predetermined amount to the integral term immediately before the establishment of the elongation dependent shift condition may be used.
- the limitation of the feed hack control is not limited to fixing the integral term to a fixed value, but includes setting an upper limit for the integral term and limiting the update amount of the integral term.
- the integral term is not limited to the integral term of the PI control equation and the PID control equation.
- the present invention can be applied to all feedback control having correction terms that accumulate over time, and the integral term includes all correction amounts that accumulate over time. Therefore, for example, the present invention can be applied to sliding mode control.
- the target speed ratio Dip is the target of feedback control.
- the feedback control amount ⁇ x of the PI control type or PID control type is set as the change amount of the target gear ratio.
- the hydraulic control circuit 21 implements the thrust of the primary pulley 11 and the secondary pulley 12 corresponding to the target gear ratio corrected by the feedback control amount ⁇ x via the hydraulic cylinders 15 and 16, respectively. Furthermore, when the thrust of one of the primary pulley 11 and the secondary pulley 12 is kept constant, it is possible for the hydraulic control circuit 21 to realize feedback control by changing only the other thrust.
- the thrust of the primary pulley 11 is constant and the gear ratio of the CVT 4 is changed by thrust control of the secondary pulley 12.
- the feedback control amount ⁇ x of the PI control type or the PID control type is used as the thrust of the secondary pulley 12.
- ⁇ y is a gear ratio deviation.
- FIG. 8 and FIG. 10 is different from the first embodiment or the second embodiment in that the feedback control target in steps S4 to S6 is replaced with the thrust of the secondary pulley 12 from the target gear ratio.
- the feedback control is performed with respect to the prevention of the response delay due to the accumulation of the integral term under the elongation-dependent shift condition.
- a preferable effect similar to that obtained when the target gear ratio is set as the target can be obtained.
- FIG. 11-FIG. 14 and FIG. A third embodiment of the present invention will be described with reference to 15A and 15B.
- the object of feedback control is the pulley thrust
- the stretch-dependent shift condition is determined by a method different from that in the first and second embodiments.
- the elongation-dependent shift conditions will be explained in relation to pulley thrust.
- pulley thrust When the V chain 13 transmits torque between the primary pulley 11 and the secondary pulley 12, if a large slip occurs between the V chain 13 and the primary pulley 11 or the secondary pulley 12, torque transmission becomes difficult. Such slip occurs due to a decrease in the thrust of the primary pulley 11 or the pulley thrust of the secondary pulley 12. For normal torque transmission, it is necessary to apply a pulley thrust greater than the slip limit thrust to both the primary pulley 11 and the secondary pulley 12.
- the pulley thrust that the hydraulic cylinder 15 applies to the primary pulley 11 is referred to as primary thrust
- the pulley thrust that the hydraulic cylinder 16 applies to the secondary pulley 12 is referred to as secondary thrust.
- the ratio of primary thrust to secondary thrust to achieve the target gear ratio is called thrust ratio.
- the gear ratio is 1.0 when the primary thrust and the secondary thrust are equal when the CVT 4 is in a no-load state, that is, the input torque is zero.
- the primary thrust exceeds the secondary thrust, the high gear ratio is obtained.
- the primary thrust is less than the secondary thrust, the low gear ratio is obtained.
- the primary thrust and the secondary thrust for realizing the target speed ratio Dip are expressed by a thrust ratio determined by the target speed ratio Dip and the tension of the V chain 13.
- both primary thrust and secondary thrust must be equal to or greater than the slip limit thrust and satisfy the thrust ratio.
- substantial slip means slip of the V chain 13 that hinders torque transmission.
- the slip limit thrust can be obtained by the following equation (1).
- Fmin slip limit thrust
- Fs_min slip limit secondary thrust
- Fp_min slip limit primary thrust
- Tp primary pulley input torque
- ⁇ sheave angle
- ⁇ coefficient of friction between V chain and pulley
- Rp the radius of winding of the V chain around the primary pulley.
- the slip limit secondary thrust Fs_min is also expressed by the following equation (2).
- the primary pulley input torque Tp and the secondary pulley input torque Ts are in the relationship of the following equation (3).
- the winding radius Rp of the V chain 13 around the primary pulley 11 and the winding radius Rs of the V chain 13 around the secondary pulley 12 are in the relationship of the following equation (4).
- the slip limit thrust is set to a value slightly larger than the value obtained by the equation (1).
- the thrust ratio is FIG. 11 can be obtained by referring to the characteristic map shown in FIG. FIG.
- the horizontal axis represents the input torque ratio.
- the input torque ratio refers to the ratio of the input torque Tp of the primary pulley 11 to the transmission torque capacity Tin_max of the V chain 13, that is, Tp / Tin_max.
- the transmission torque capacity Tin_max of the V chain 13 is set equal to the value of the input torque Tp calculated by substituting the smaller one of the actual primary thrust and the actual secondary thrust for the slip limit thrust F_min in the equation (1). .
- the transmission torque capacity Tin_max means the maximum input torque Tp of the primary pulley 11 at which the V chain 13 does not slip with respect to the actual primary thrust and the actual secondary thrust.
- the vertical axis 11 indicates the thrust ratio Fp / Fs between the primary thrust Fp and the secondary thrust Fs that is necessary to achieve various target speed ratios Dip under the input torque ratio Tp / Tin_max.
- the shift controller 22 is shown in FIG.
- the thrust ratio Fp / Fs is obtained from the input torque ratio Tp / Tin_max and the target speed ratio Dip with reference to the characteristic map shown in FIG.
- the transmission controller 22 sets the secondary thrust Fs to the slip limit thrust and obtains the primary thrust Fp from the slip limit thrust and the thrust ratio.
- FIG. 12 denotes a method for determining the secondary balance thrust and the primary balance thrust in a region where the thrust ratio is 1 or more.
- the shortage of the primary thrust is added based on the secondary thrust so that the ratio of the secondary thrust and the primary thrust satisfies the thrust ratio.
- FIG. 13 With reference to FIG. 13, the structure of the speed change controller 22 that feedback-controls the primary thrust and the secondary thrust will be described.
- An engine torque Teng is input to the transmission controller 22 from an engine control unit (ECU) 51 that controls the operation of the internal combustion engine 1.
- ECU engine control unit
- the accelerator pedal opening APO detected by the accelerator pedal opening, the rotation speed Np of the primary pulley 11 detected by the primary rotation sensor 42, and the rotation speed Ns of the secondary pulley 12 detected by the secondary rotation sensor 43 are input as signals. .
- the transmission controller 22 calculates the slip limit thrust Fmin, the target speed ratio Dip, the secondary balance thrust Fs, and the primary balance thrust Fp from the above input data. Therefore, the transmission controller 22 includes a primary input torque calculation unit B1, a target primary rotational speed calculation unit B2, a target transmission ratio calculation unit B3, an actual transmission ratio calculation unit B4, a slip limit thrust calculation unit B5, and a V chain transmission torque capacity calculation unit. B6, thrust ratio calculation unit B7, secondary balance thrust calculation unit B8, primary balance thrust calculation unit B9, transmission ratio feedback secondary thrust calculation unit B10, transmission ratio feedback primary thrust calculation unit B11, hydraulic conversion units B12 and B13, and an adder B14 and B15 are provided.
- Blocks B1-B15 shown in this figure represent the pulley thrust feedback control function of the speed change controller 22 as a virtual unit, and do not imply physical presence.
- the primary input torque calculation unit B1 is based on the engine torque Teng input from the ECU 51, the lock-up state of the torque converter 2, and the inertia torque of the power transmission member from the internal combustion engine 1 to the primary pulley 11 in a known manner. Tp is calculated.
- the target primary rotational speed calculation unit B2 calculates the FIG. 1 stored in advance from the accelerator pedal opening APO and the rotational speed Ns of the secondary pulley 12.
- the target primary rotational speed DNp is calculated with reference to the shift map having the characteristics shown in FIG.
- the target gear ratio calculation unit B3 calculates the target gear ratio Dip from the rotation speed Ns of the secondary pulley 12 and the target primary rotation speed DNp input from the target primary rotation speed calculation unit B2.
- Actual speed ratio calculation unit B4 calculates the actual speed ratio ip of CVT4 from the rotational speed Ns of the secondary pulley 12 and the rotational speed Np of the primary pulley 11 detected by the primary rotation sensor 42.
- the slip limit force calculating unit B5 is based on the primary input torque Tp, the winding radius Rp of the V chain 13 around the primary pulley 11, the friction coefficient ⁇ between the V chain 13 and the pulley 11, and the sheave angle ⁇ .
- the slip limit thrust Fmin is calculated. Further, based on the equation (2), the slip limit is calculated from the primary input torque Tp, the radius Rs of the V chain 13 wound around the secondary pulley 12, the friction coefficient ⁇ between the V chain 13 and the secondary pulley 12, and the sheave angle ⁇ .
- the thrust Fmin is calculated.
- the primary input torque Tp is input from the primary input torque calculation unit B1.
- the winding radius Rp of the V chain 13 around the primary pulley 11 and the winding radius Rs of the V chain 13 around the secondary pulley 12 are calculated from the actual gear ratio ip.
- the sheave angle ⁇ is a known value determined in advance by the shapes and dimensions of the primary pulley 11, the secondary pulley 12, and the V chain 13, and the friction coefficient ⁇ is determined from the material of the primary pulley 11, the secondary pulley 12, and the V chain 13. It is a known value determined in advance.
- the slip limit force calculation unit B5 sets the smaller value of the obtained slip limit thrusts Fp_min and Fs_min to F_min.
- the V chain transmission torque capacity calculation unit B6 employs the value of the primary input torque Tp obtained by inputting the set slip limit thrust F_min into the equation (1) as the transmission torque capacity Tin_max.
- the thrust ratio calculation unit B7 calculates the input torque ratio Tp / Tin_max from the transmission torque capacity Tin_max and the primary input torque Tp, and based on the input torque ratio Tp / Tin_max and the target gear ratio Dip, FIG.
- the thrust ratio Fp / Fs is obtained with reference to the thrust ratio map of the characteristic shown in FIG.
- the thrust ratio map is stored in advance in the ROM of the speed change controller 22.
- the transmission ratio feedback secondary thrust calculation unit B10 is based on the difference or ratio between the actual transmission ratio ip and the target transmission ratio Dip so that the actual transmission ratio ip approaches the target transmission ratio Dip.
- Fs_fb is calculated.
- the speed ratio feedback secondary thrust Fs_fb is calculated using the above-described PI control formula or PID control formula.
- the feedback correction amount ⁇ x on the left side of these equations is not the feedback correction amount of the gear ratio but the gear ratio feedback secondary thrust Fs_fb corresponding to the feedback correction amount of the secondary thrust.
- the transmission ratio feedback secondary thrust calculation unit B10 further regulates the transmission ratio feedback secondary thrust Fs_fb so that the value obtained by adding the transmission ratio feedback secondary thrust Fs_fb to the secondary balance thrust Fs does not fall below the slip limit thrust Fmin.
- the transmission ratio feedback primary thrust calculation unit B11 calculates the transmission ratio feedback primary thrust Fp_fb so that the actual transmission ratio ip approaches the target transmission ratio Dip based on the difference or ratio between the actual transmission ratio ip and the target transmission ratio Dip.
- the transmission ratio feedback primary thrust Fp_fb is calculated using the above-described PI control formula or PID control formula. However, the feedback correction amount ⁇ x on the left side of these equations is not the gear ratio feedback correction amount but the gear ratio feedback primary thrust Fp_fb corresponding to the primary thrust feedback correction amount.
- the transmission ratio feedback primary thrust calculation unit B11 further regulates the transmission ratio feedback primary thrust Fp_fb so that the value obtained by adding the transmission ratio feedback primary thrust Fp_fb to the primary balance thrust Fp does not fall below the slip limit thrust Fmin.
- the adder B14 adds the gear ratio feedback secondary thrust Fs_fb to the secondary balance thrust Fs and inputs the addition result to the hydraulic pressure conversion unit B12.
- the adder B15 adds the gear ratio feedback primary thrust Fp_fb to the primary balance thrust Fp, and inputs the addition result to the hydraulic pressure conversion unit B13.
- the hydraulic pressure calculation unit B12 converts the input value Fs + Fs_fb from the adder B14 into the target secondary pressure Ps to be supplied to the hydraulic cylinder 16, and outputs the target secondary pressure Ps to the hydraulic pressure control circuit 21.
- the target secondary pressure Ps is calculated by dividing the value obtained by subtracting the centrifugal thrust and the spring thrust from the input value Fs + Fs_fb by the pressure receiving area.
- the centrifugal thrust is calculated from the rotational speed Ns of the secondary pulley 12 and a predetermined secondary pulley centrifugal thrust coefficient.
- the spring thrust is calculated from the stroke distance of the hydraulic cylinder 16.
- the hydraulic idle unit B13 converts the input value Fp + Fp_fb from the adder B15 into a target primary pressure Pp to be supplied to the hydraulic cylinder 15 and outputs it to the hydraulic control circuit 21.
- the target primary pressure Pp is calculated by dividing the value obtained by subtracting the centrifugal thrust and the spring thrust from the input value Fp + Fp_fb by the pressure receiving area.
- the centrifugal thrust is calculated from the rotational speed Np of the primary pulley 11 and a predetermined primary pulley centrifugal thrust coefficient.
- the spring thrust is calculated from the stroke distance of the hydraulic cylinder 15.
- the pulley thrust in other words, the target primary pressure Pp to be supplied to the hydraulic cylinder 15 and the target secondary pressure Ps to be supplied to the hydraulic cylinder 16 are targets for feedback control.
- the speed change controller 22 sets the target speed change ratio Dip to FIG. 9 is set between the maximum speed ratio without elongation and the minimum speed ratio with elongation, with reference to the characteristic map shown in FIG. 9, the speed ratio width can be set wide as in the second embodiment.
- the maximum gear ratio there are cases where the target gear ratio Dip cannot be realized depending on whether the V chain 13 is extended. That is.
- the target speed ratio Dip in the region between the maximum speed ratio with extension and the maximum speed ratio without extension in the figure cannot be physically achieved.
- the target speed ratio Dip in the region between the stretched minimum speed ratio and the unstretched minimum speed ratio in the figure cannot be physically achieved.
- the shift controller 22 determines whether or not the elongation-dependent shift condition is satisfied with respect to both the shift condition near the minimum speed ratio and the maximum speed ratio. Limit the update of the integral term depending on the result.
- Steps S1-S3 and steps S12 and S13 are the same as those in the second embodiment.
- the processing of steps S45 and S46 is similar to the processing of steps S5 and S6 of the second embodiment, but the processing target of the processing of steps S5 and S6 is the target gear ratio, whereas the processing of steps S45 and S46.
- the difference is that the object is pulley thrust.
- step S3 If the determination in step S3 is affirmative, it means that the current speed change condition corresponds to an elongation-dependent speed change condition near the minimum speed ratio as described above.
- the speed change controller 22 reads the primary input torque Tp and the rotation speed Np of the primary pulley 11 in step S21.
- the transmission controller 22 calculates a primary thrust lower limit value Fp_min from the primary input torque Tp.
- the primary pulley 11 is configured such that the V-groove does not expand beyond a certain width when the movable sheave contacts the stopper. After the movable sheave comes into contact with the stopper, even if the primary thrust is further reduced, the width of the V groove of the primary pulley 11 is not changed and the gear ratio is not reduced. Therefore, the primary thrust lower limit value Fp_min is set based on the primary thrust corresponding to the contact position with the stopper of the movable sheave.
- the primary thrust lower limit value Fp_min is calculated from the primary input torque Tp and the rotational speed Np of the primary pulley 11, and the primary thrust lower limit value Fp_min is set to a value slightly higher than the calculated value in consideration of uncertain factors due to hardware variations. You may do it.
- step S23 the transmission controller 22 determines whether or not the addition value Fp + Fp_fb by the adder B15 is smaller than the primary thrust lower limit value Fp_min.
- the added value Fp + Fp_fb is smaller than the primary thrust lower limit Fp_min, the actual speed ratio ip cannot reach the target speed ratio Dip if the V chain 13 is extended.
- the integral term included in the feedback control amount Fp_fb is accumulated each time it is executed. As a result, when the target speed ratio Dip increases and exceeds the minimum speed ratio, a delay occurs in following the actual speed ratio ip.
- step S23 the speed change controller 22 limits the feedback control amount Fp_fb by setting the integral term included in the feedback control amount Fp_fb to a fixed value in step S24. Pulley thrust feedback control based on the value. Specifically, if the determination in step S23 is affirmative, the integral term in step S45 is not updated, and the pulley term feedback control is performed in step S24 using the pre-update integral term stored in the buffer. I do. After the process of step S24, the shift controller 22 ends the routine. If the determination in step S23 is negative, the transmission controller 22 performs normal pulley thrust feedback control in steps S45 and S46.
- step S13 determines whether the current speed change condition corresponds to an elongation-dependent speed change condition near the maximum speed ratio as described above.
- the speed change controller 22 calculates the secondary thrust upper limit value Fs_max from the primary input torque Tp in step S32.
- the secondary thrust upper limit Fs_max is a secondary thrust for realizing the maximum speed ratio without elongation, calculated from the primary input torque Tp and the rotational speed Np of the primary pulley 11.
- the secondary thrust upper limit Fs_max may be set to a value slightly lower than the calculated value in consideration of uncertain factors due to hardware variations.
- step S33 the transmission controller 22 determines whether or not the addition value Fs + Fs_fb by the adder R14 is greater than the secondary thrust upper limit value Fs_max.
- the added value Fs + Fs_fb is larger than the secondary thrust upper limit value Fs_max, the actual speed ratio ip cannot reach the target speed ratio Dip unless the V chain 13 is extended.
- the integral term included in the feedback control amount Fs_fb is accumulated, and when the target speed ratio Dip falls below the maximum speed ratio without elongation, there is a delay in following the actual speed ratio ip.
- step S33 the speed change controller 22 limits the feedback control amount Fs_fb in step S34 by limiting the feedback integrated value included in the hoodback control amount Fs_fb to a fixed value. Pulley thrust feedback control based on the value. Specifically, if the determination in step S33 is positive, the integral term in step S45 is not updated, and the pulley thrust feedback control is performed in step S34 using the pre-update integral term stored in the buffer. I do. After step S34, the transmission controller 22 ends the routine. If the determination in step S33 is negative, the transmission controller 22 performs normal pulley thrust feedback control in steps S45 and S46. Also, if either of the determinations in steps S12 and S13 is negative, the transmission controller 22 performs normal pulley thrust feedback control in steps S45 and S46.
- FIG. 13 When the output value Fp + Fp_fb of the adder B15 shown in FIG. 13 falls below the primary thrust lower limit value Fp_min, the integral term included in the feedback control amount Fp_fb is fixed, and when the output value Fs + Fs_fb of the adder B14 exceeds the secondary thrust upper limit value Fs_max Is fixed to an integral term included in the feedback control amount Fs_fb.
- the shift condition is changed from the stretch-dependent shift condition to the non-extension-dependent shift condition by limiting the feedback control with respect to the primary thrust or the secondary thrust corresponding to the stretch-dependent shift condition. If this happens, response delays are prevented.
- FIGS. 15A and 15B when the target speed ratio Dip increases, the elongation-dependent speed change condition near the maximum speed ratio is satisfied at time t1, and the pulley thrust according to this embodiment is not satisfied at time t2.
- the thin broken line represents the target speed ratio Dip.
- a thick broken line represents a change in the actual gear ratio ip when the integral term update limiting routine according to this embodiment is executed.
- the solid line shows the change in the actual gear ratio ip when the integral term update restriction routine is not executed under the elongation-dependent gear condition.
- FIG. 15B a thin broken line represents a change in the pulley thrust of the secondary pulley 12 when the gear ratio feedback control is prohibited.
- the pulley thrust of the secondary pulley 12 when the gear ratio feedback control is prohibited is the FIG. This corresponds to the secondary balance thrust Fs output by the 13 secondary balance thrust calculation unit B8.
- a thick broken line represents a change in pulley thrust of the secondary pulley 12 when the integral term update restriction routine is executed.
- a solid line represents a change in pulley thrust of the secondary pulley 12 when the integral term update restriction routine is not executed.
- the shift controller 22 is shown in FIG.
- the integral term is accumulated under the PI control or PID control by the pulley thrust feedback control function shown in FIG.
- the pulley thrust Fs of the secondary pulley 12 increases with time.
- the shift controller 22 is operated in parallel with the feedback control of the pulley thrust in FIG. 14 when the integral term update restriction routine is not executed, the FIG.
- the thrust Fs of the secondary pulley 12 continues to increase.
- the thrust Fs of the secondary pulley 12 starts to decrease, but it takes time to decrease the accumulated integral term.
- the decrease in the thrust Fs cannot immediately follow the decrease in the target speed ratio Dip.
- FIG. As indicated by the solid line 15A, the actual gear ratio ip matches the target gear ratio Dip after a considerable time has elapsed from time t2.
- the shift controller 22 is operated in parallel with FIG. 14, when the deviation of the actual speed ratio ip from the target speed ratio Dip starts after the time t1, the pulley thrust of the secondary pulley 12 reaches the maximum speed ratio threshold value ip_max. Thereafter, the integral term used for pulley thrust feedback control is fixed to a value immediately before the pulley thrust Fs reaches the maximum gear ratio threshold value ip_max. For this reason, even if the deviation state between the actual speed ratio ip and the target speed ratio Dip continues, the integral term used for the feedback control of the pulley thrust does not accumulate, and the pulley thrust of the secondary pulley 12 adds a constant value to the secondary balance thrust Fs. Maintain the state. Therefore, an excessive pulley thrust exceeding the maximum gear ratio threshold value ip_max is not commanded.
- the pulley thrust of the secondary pulley 12 immediately starts to decrease. Then, after the target speed ratio Dip does not satisfy the elongation-dependent speed change condition at time t2, the pulley thrust of the secondary pulley 12 is quickly reduced to make the actual speed ratio ip coincide with the target speed ratio Dip.
- the transmission ratio feedback control is limited by setting the integral term to a fixed value under the elongation-dependent shift condition.
- the limitation of the gear ratio feedback control is not limited to setting the integral term to a fixed value. For example, it is possible to uniformly prohibit feedback control. Also in this case, FIG. As shown to 15B, when the target gear ratio Dip stops satisfy
- the gear ratio feedback control is not prohibited even under the elongation-dependent gear shift condition in consideration of such a case.
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Abstract
Description
Δx=変速比フィードバック制御量、
Kp=比例ゲイン、
Ki=積分ゲイン、
Kd=微分ゲイン。
Fs_min=滑り限界セカンダリ推力、
Fp_min=滑り限界プライマリ推力、
Tp=プライマリプーリ入力トルク、
α=シーブ角、
μ=Vチェーンとプーリ間の摩擦係数、
Rp=プライマリプーリへのVチェーンの巻き付き半径。
Rs=セカンダリプーリへのVチェーンの巻き付き半径。
Claims (12)
- 一対のプーリ(11,12)に掛け回された無端トルク伝達部材(13)を介して一対のプーリ(11,12)間で変速を行う無段変速機(4)の変速制御装置、において:
次のようにプログラムされたプログラマブルコントローラ(22):
一対のプーリ(11,12)間の実変速比が目標変速比に追随するように変速比をフィードバック制御し(S6,S46);
無端トルク伝達部材(13)の伸びの有無が実変速比の目標変速比への到達を不可能にする伸び依存変速条件が成立するかどうかを判定し(S2,S3、S12,S13);
伸び依存変速条件が成立する場合に、変速比のフィードバック制御を制限する(S4,S24,S34);
を備える。 - 請求項1の変速制御装置において、コントローラ(22)は、目標変速比と実変速比との乖離が継続する限り累加する積分項を含むフィードバック制御量を適用することで、変速比をフィードバック制御し(S5,S6,S45,S46)、積分項の累加を阻止することで変速比のフィードバック制御を制限するよう(S4,S24,S34)、さらにプログラムされる。
- 請求項2の変速制御装置において、コントローラ(22)は、伸び依存変速条件が成立する期間中の積分項を、伸び依存変速条件が成立する直前の積分項の値に固定することで、積分項の累加を阻止するよう(S4,S24,S34)、さらにプログラムされる。
- 請求項2の変速制御装置において、コントローラ(22)は、伸び依存変速条件が成立する期間中の積分項に上限を設けることで、積分項の累加を阻止するよう(S4,S24,S34)、さらにプログラムされる。
- 請求項1から4のいずれかの変速制御装置において、コントローラ(22)は、実変速比が、無端トルク伝達部材(13)に伸びがある場合に実現し得る伸びあり最小変速比以下であって(S2)、かつ目標変速比より大きい場合に(S3)、伸び依存変速条件が成立したと判定するよう、さらにプログラムされる。
- 請求項1から5のいずれかの変速制御装置において、コントローラ(22)は、実変速比が、無端トルク伝達部材(13)に伸びがない場合に実現し得る伸びなし最大変速比以上であって(S12)、かつ目標変速比より小さい場合に(S13)、伸び依存変速条件が成立したと判定するよう、さらにプログラムされる。
- 請求項2から4のいずれかの変速制御装置において、コントローラ(22)は、フィードバック制御量を目標変速比に適用することで変速比をフィードバック制御するよう(S6)、さらにプログラムされる。
- 請求項2から4のいずれかの変速制御装置において、実変速比は、一対のプーリ(11,12)を構成する各プーリ(11,12)に加えられるプーリ推力に応じて変化するとともに、コントローラ(22)は、フィードバック制御量を一対のプーリ(11,12)のいずれかのプーリ(11,12)に加えられるプーリ推力に適用することで変速比をフィードバック制御するよう(S46)、更にプログラムされる。
- 請求項7または8の変速制御装置において、一対のプーリ(11,12)は回転トルクを入力するプライマリプーリ(11)と回転トルクを出力するセカンダリプーリ(12)からなり、コントローラ(22)は、実変速比が、無端トルク伝達部材(13)に伸びがある場合に実現し得る伸びあり最小変速比以下であって(S2)、かつ目標変速比より大きい場合に(S3)、伸び依存変速条件が成立したと判定し、伸び依存変速条件が成立し、かつフィードック制御を加えたプライマリプーリ推力が予め定めたプーリ推力下限値を下回る場合に(S23)、積分項の累加を阻止するよう(S24)、さらにプログラムされる。
- 請求項7または8の変速制御装置において、一対のプーリ(11,12)は回転トルクを入力するプライマリプーリ(11)と回転トルクを出力するセカンダリプーリ(12)からなり、コントローラ(22)は、実変速比が、無端トルク伝達部材に伸びがない場合に実現し得る伸びなし最大変速比以上であって(S12)、かつ目標変速比より小さい場合に(S13)、伸び依存変速条件が成立したと判定し、伸び依存変速条件が成立し、かつフィードバック制御を加えたセカンダリプーリ推力が予め定めたプーリ推力上限値を上回る場合に(S33)、積分項の累加を阻止するよう(S34)、さらにプログラムされる。
- 請求項1から10のいずれかの変速制御装置において、目標変速比は、無端トルク伝達部材(13)に伸びがない場合に実現し得る伸びなし最小変速比から、無端トルク伝達部材(13)に伸びがある場合に実現し得る伸びあり最大変速比に至る変速比領域の全域を対象として設定される。
- 一対のプーリ(11,12)に掛け回された無端トルク伝達部材(13)を介して一対のプーリ(11,12)間で変速を行う無段変速機(4)の制御方法、において:
一対のプーリ(11,12)間の実変速比が目標変速比に追随するように変速比をフィードバック制御し(S6,S46);
無端トルク伝達部材の伸びの有無が実変速比の目標変速比への到達を不可能にする伸び依存変速条件が成立するかどうかを判定し(S2,S3、S12,S13);
伸び依存変速条件が成立する場合に、変速比のフィードバック制御を制限する(S4,S24,S34);
ことを特徴とする無段変速機(4)の変速制御方法。
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RU2013138403/11A RU2013138403A (ru) | 2011-01-17 | 2011-11-14 | Устройство управления и способ управления изменением передаточного отношения для бесступенчатой трансмиссии |
CN2011800651100A CN103314239A (zh) | 2011-01-17 | 2011-11-14 | 无级变速器的变速控制装置及控制方法 |
MX2013008204A MX2013008204A (es) | 2011-01-17 | 2011-11-14 | Dispositivo de control de cambio y metodo de control para la transmision continuamente variable. |
EP11856144.8A EP2667057A1 (en) | 2011-01-17 | 2011-11-14 | Transmission control device for continuously variable transmission, and control method |
BR112013018143A BR112013018143A2 (pt) | 2011-01-17 | 2011-11-14 | dispositivo de controle de desvio e método de controle para transmissão continuamente variável |
US13/979,463 US20130289841A1 (en) | 2011-01-17 | 2011-11-14 | Shift control device and control method for continuously variable transmission |
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CN107407404B (zh) * | 2015-03-23 | 2019-06-07 | 加特可株式会社 | 无级变速器的控制装置及其控制方法 |
JP2018003952A (ja) * | 2016-07-01 | 2018-01-11 | 本田技研工業株式会社 | ベルト式無段変速機 |
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JP2001330135A (ja) * | 2000-05-23 | 2001-11-30 | Toyota Motor Corp | ベルト式無段変速機の制御装置 |
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JP5691602B2 (ja) * | 2011-02-15 | 2015-04-01 | 日産自動車株式会社 | 無段変速機の変速制御装置及び制御方法 |
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JPH08327857A (ja) | 1995-05-29 | 1996-12-13 | Fujikura Ltd | 多心光ファイバの分岐部の形成方法及び分岐部の構造 |
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RU2013138403A (ru) | 2015-02-27 |
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