JP2012255489A - Release control device of electromagnetic engaging device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a release control device capable of easily, accurately and further quickly determining the release of an electromagnetic engaging device.SOLUTION: This release control device includes: a target rotating speed setting means for determining a target rotating speed of a predetermined rotation member after releasing the electromagnetic engaging device, while the electromagnetic engaging device is engaged when a release determination for switching the electromagnetic engaging device to a release state of cutting off the transmission of torque from an engaging state of being capable of transmitting the torque, is established; a feedback control means (Step S3) for controlling a rotating speed of the predetermined rotation member by making a feedback process based on a deviation between the target rotating speed and an actual rotating speed; and a release determining means (Step S6 and S7) for determining the release of the electromagnetic engaging device based on the fact that an indication torque value of a driving force source for rotating the predetermined rotation member, exceeds a predetermined reference value when releasing by reducing electromagnetic force after the start of the feedback control of the rotating speed of the predetermined rotation member by the feedback control means.

Description

  The present invention relates to a device that controls an engagement device such as a clutch or a brake that is engaged or released by electromagnetic force, and particularly when switching from an engagement state that transmits torque to a release state that interrupts torque transmission. The present invention relates to a device that performs control.

  Clutchs and brakes that transmit and shut off torque are widely used as devices for shifting gears in vehicles or changing power transmission state as appropriate, for example. Has been. The vehicle drive device described in Patent Document 1 is a hybrid drive device that includes an engine and a motor / generator as power sources, and in particular, a power split device that is configured mainly with a planetary gear mechanism for power output from the engine. Is divided into an output side and a first motor / generator side, and the power on the output side is transmitted to the output shaft, while the first motor / generator is divided by the power transmitted to the first motor / generator side. Drive to generate power, supply the power to a second motor / generator connected to the output shaft, and the second motor / generator functions as a motor to transmit the output torque to the output shaft Has been. In this type of hybrid drive device, the first motor / generator functions as a generator and the second motor / generator functions as a motor when the load is high. If the engine speed is controlled by the generator, the first motor / generator functions as a motor to rotate in the opposite direction to the engine, and the second motor / generator functions as a generator to drive power. And the resulting electric power is supplied to the first motor / generator. In such a low-load high-speed driving state, so-called power circulation may occur and energy efficiency may be reduced. Therefore, the reaction force obtained by causing the first motor / generator to function as a motor is braked. The fixed speed change mode to be handled by can be set. That is, in the device described in Patent Document 1, a predetermined rotation element in a power split device configured by combining a single pinion type planetary gear mechanism and a double pinion type planetary gear mechanism is connected to a brake unit, and a fixed speed change mode is established. Then, the brake portion is engaged to stop the rotation of the predetermined rotating element.

  Patent Document 2 describes a device provided with a brake for fixing a first motor / generator in a so-called two-motor type hybrid drive device. In particular, the brake includes a cam lock type lock mechanism and a so-called electromagnetic mechanism. It is comprised by the clutch. In the device described in Patent Document 2, the rotation synchronization feedback control is continued even after the clutch plate is attracted by electromagnetic force and the clutch plate starts a stroke. In this case, after the clutch plate starts to stroke. Is to fix the integral term in the feedback control.

JP 2009-234325 A JP 2010-269668 A

  Engagement devices such as clutches and brakes are not only switched in a stopped state, but may also be switched in an operating state (rotating state). When switching, it is switched from the disengaged state to the engaged state, or vice versa, from the engaged state to the disengaged state. Further, in the hybrid drive device described above, when switching between the fixed speed change mode and the continuously variable speed change mode. On the other hand, the state is switched from the released state to the engaged state, or vice versa. When switching in such an operating state, a shock occurs when the torque or the rotational speed changes abruptly. In order to avoid or suppress this, it is preferable to accurately detect or estimate the timing of engagement or disengagement and appropriately execute control according to the switching.

  In the device described in Patent Document 1 described above, the first motor / generator is controlled to the target rotational speed after the reaction force of the clutch becomes almost zero, but the reaction force of the clutch is the state of acceleration / deceleration of the vehicle. Alternatively, it is difficult to accurately detect or determine when the torque changes from the driving wheel and the time when the torque becomes almost zero. This is a factor in controlling the timing of the first motor / generator. Alternatively, there is a possibility that the control amount becomes inappropriate and a shock occurs or drivability deteriorates.

  Note that the device described in Patent Document 2 is intended for a clutch that uses a cam lock type locking mechanism. In this type of device, there is backlash due to backlash. It is possible to determine the completion of torque adjustment by using and to set the operation start point. However, since such a determination is based on the assumption that play occurs, it cannot be employed in a mechanism without play.

  The present invention has been made against the background described above, and it is an object of the present invention to provide a control device that can easily and accurately detect or determine the release timing of an electromagnetic engagement device, and thus enables quick release control. It is what.

  In order to achieve the above object, the invention according to claim 1 is arranged between a predetermined rotating member and another member, and the predetermined rotating member and the other rotating member are arranged with a frictional force corresponding to an electromagnetic force. In a release control device for an electromagnetic engagement device that transmits torque between the electromagnetic engagement devices, when the release determination for switching the electromagnetic engagement device from an engagement state in which torque can be transmitted to a release state in which torque transmission is interrupted is established A target rotational speed setting means for obtaining a target rotational speed of the predetermined rotating member after releasing the electromagnetic engaging device in a state in which the combined device is engaged, and the target rotational speed and the actual rotational speed; Feedback control means for feedback control of the rotational speed of the predetermined rotating member based on the deviation of the predetermined rotational member, and electric power after the rotational speed of the predetermined rotating member starts feedback control by the feedback control means. Release determination for determining release of the electromagnetic engagement device based on an indication torque value of a driving force source for rotating the predetermined rotating member exceeding a predetermined reference value when the force is reduced and released Means.

  According to a second aspect of the present invention, in the first aspect of the invention, the feedback control unit executes feedback control for performing an integral operation, and until the release determination unit determines that the electromagnetic engagement device is released. A release control device for an electromagnetic engagement device comprising means for stopping the integration operation.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, the release determination means may be configured so that the difference between the actual rotational speed of the predetermined rotating member and the target rotational speed is equal to or less than a predetermined value. An electromagnetic engagement device disengagement control device including means for starting a determination as to whether or not a command torque value of a driving force source exceeds a predetermined reference value.

  According to a fourth aspect of the present invention, in the first to third aspects of the present invention, the apparatus further comprises torque reducing means for reducing the indicated torque value when the temperature of the driving force source is equal to or higher than a predetermined reference temperature. This is a release control device for the electromagnetic engagement device.

  According to the first aspect of the present invention, when the determination to release the electromagnetic engagement device that connects the predetermined rotation member to another member is established and the electromagnetic engagement device is released, the predetermined engagement after release is performed. A target rotational speed of the rotating member is set, and the rotational speed of the predetermined rotating member toward the target rotational speed is feedback-controlled. This is performed by the driving force source connected to the predetermined rotating member outputting torque, and the indicated torque value for the driving force source decreases as the actual rotational speed approaches the target rotational speed. As a result, the release of the electromagnetic engagement device is determined when the command torque value exceeds a predetermined reference value. Therefore, it is possible to easily and accurately determine the release of the electromagnetic engagement device or the release timing without detecting the transmission torque of the electromagnetic engagement device or the torque of the predetermined rotating member.

  In particular, according to the second aspect of the present invention, when performing the rotational speed feedback control, the electromagnetic engaging device is still engaged and the predetermined rotating member is stopped, or the relative rotation with the other member is performed. When the number does not occur, the integral operation (integral term) for canceling the steady deviation is stopped, so that the torque that causes the predetermined rotation member to rotate relative to the other member is excessively generated. After the determination of the release of the electromagnetic engagement device is established, the rotational speed feedback control for the target rotational speed can be executed in the same manner as usual.

  According to the invention of claim 3, in addition to the same effect as described above, after the determination of the release of the electromagnetic engagement device is established, the electromagnetic engagement device is still engaged. Even if the command torque value decreases due to disturbance, the release determination has not yet been made at that time, and after the rotational speed deviation has decreased to some extent, that is, after the release of the electromagnetic engagement device has become close, Since the determination is performed, erroneous determination can be prevented or suppressed in advance.

  According to the fourth aspect of the present invention, when the temperature of the driving force source that outputs torque increases so as to control the rotation speed of the predetermined rotating member toward the target rotation speed, the driving force source Since the torque to be output, that is, the indicated torque value is reduced, the durability of the driving force source can be improved.

It is a flowchart for demonstrating an example of the control performed by the release control apparatus which concerns on this invention. It is a time chart which shows an example of changes, such as rotation speed at the time of performing control shown in Drawing 1, and instruction torque value. It is sectional drawing which shows typically the brake which is an example of the electromagnetic engagement apparatus made into object by this invention. It is sectional drawing which shows typically the clutch which is an example of the electromagnetic engagement apparatus made into object by this invention. It is a schematic diagram which shows an example of the hybrid drive device using the brake. It is a collinear diagram about the planetary gear mechanism that constitutes the power split mechanism. It is a schematic diagram which shows the other example of the hybrid drive device using the brake. It is a schematic diagram which shows an example of the hybrid drive device for FF vehicles.

  The present invention is a device that generates a frictional force according to an electromagnetic force (electromagnetic attractive force) and controls an engagement device having a transmission torque capacity based on the frictional force, and a brake that connects a rotating member to a fixed location. An example is a clutch that connects the rotating members to each other. FIG. 3 shows an example of the brake 1. In the example shown here, the rotary shaft 2 is selectively connected to the mission casing 3 to apply a braking force to the rotary shaft 2, and the rotary shaft 2 is connected to the mission casing 3 via a bearing 4. A yoke 6 having an electromagnetic coil 5 is disposed on the outer peripheral side of the rotating shaft 2, and the yoke 6 is fixed to the transmission casing 3. A brake hub 7 is disposed opposite to the yoke 6, and the brake hub 7 is spline-fitted to the rotary shaft 2 and fixed by a snap ring 8. The brake hub 7 is made of a magnetic material, and further includes a boss portion 9 having an outer diameter approximately equal to the inner diameter of the yoke 6, and a brake disk 10 is spline fitted to the boss portion 9.

  On the other hand, a spline is formed in an integral part of the transmission casing 3 on the outer peripheral side of the yoke 6, and brake plates 11 arranged alternately so as to sandwich the brake disk 10 are fitted with the spline. The brake disc 10 and the brake plate 11 are made of a magnetically permeable material. Further, a return spring 13 is disposed between the brake hub 7 and the yoke 6 with a thrust bearing 12 interposed therebetween. The brake hub 7 is pushed away from the yoke 6 by the return spring 13. If the elastic force is larger than the electromagnetic attraction force by the electromagnetic coil 5 and the yoke 6, the return spring 13 pushes the brake hub 7 back and The frictional force between the brake disc 10 and the brake plate 11 is reduced. That is, the brake 1 is released by the return spring 13.

  FIG. 4 shows an example in which the electromagnetic engagement device is configured as the clutch 20, and is configured to selectively connect the first rotating shaft 21 and the second rotating shaft 22. The first rotating shaft 21 is rotatably supported by a mission casing 24 via a bearing 23. A clutch hub 25 is spline-fitted to the first rotating shaft 21 and is fixed by a snap ring 26. The second rotating shaft 22 is rotatably disposed on the outer peripheral side of the first rotating shaft 21, and a cylindrical clutch drum 27 that covers the outer peripheral side of the clutch hub 25 is integrated at an end thereof. . A clutch disk 28 is spline-fitted to the clutch hub 25 and is prevented from coming off by a snap ring 29, and a clutch plate 30 disposed so as to face the clutch disk 28 is splined on the inner peripheral portion of the clutch drum 27. It is made to fit.

  A yoke 32 including an electromagnetic coil 31 is arranged in the axial direction with respect to the clutch disk 28 and the clutch plate 30, and the yoke 32 is attached to the mission casing 24. A return spring 35 is disposed between the clutch hub 25 and the yoke 32 with a thrust bearing 34 interposed therebetween. The clutch hub 25 is pushed away from the yoke 32 by the return spring 35. If the elastic force is larger than the electromagnetic attraction force by the electromagnetic coil 31 and the yoke 32, the return spring 35 pushes the clutch hub 25 back, The frictional force between the clutch disk 28 and the clutch plate 30 is reduced. That is, the clutch 20 is released by the return spring 35.

  An example of a gear train using the brake 1 is schematically shown in FIG. The example shown here is a so-called two-motor type hybrid drive apparatus in which the power output from the engine (E / G) 40 is output by the power split mechanism 41 to the output shaft 42 side and the first motor generator (MG1) 43 side. It is comprised so that it may divide into. The engine 40 is an internal combustion engine such as a gasoline engine or a diesel engine, and an output element such as a crankshaft is connected to the power split mechanism 41. In the example shown in FIG. 5, the power split mechanism 41 is configured by a single-pinion type planetary gear mechanism. Is held by a carrier 46 so that it can rotate and revolve. The engine 40 is connected to its carrier 46, so that the carrier 46 is an input element. The sun gear 44 is connected to the first motor / generator 43, and therefore the sun gear 44 is a reaction force element. Further, the ring gear 45 is connected to the output shaft 42, and thus the ring gear 45 is an output element.

  A second motor / generator 47 is connected to the output shaft 42 via a transmission 48. The transmission 48 is configured by a transmission mechanism that increases or decreases the torque of the second motor / generator 47 and transmits it to the output shaft 42, and the transmission ratio may be fixed to a predetermined value. Alternatively, it may be configured to be switched to a plurality of gear ratios.

  Each of the motor generators 43 and 47 is constituted by, for example, a permanent magnet type synchronous motor, and functions as a motor by energizing the coil to output torque, and the rotor is forcibly rotated by an external force. It functions as a generator and is configured to generate electric power. Each of these motor generators 43 and 47 is electrically connected to a power storage device such as a battery via an inverter (not shown), and the electric power generated by one motor generator 43 (47) is used for the other motor generator 47. (43) can be supplied. The inverter is connected to an electronic control device (not shown) mainly composed of a microprocessor, and the electronic control device controls the rotational speed, torque, power generation amount, etc. of each motor / generator 43, 47. Is configured to do. The engine 40 is configured such that the intake air amount, the fuel supply amount, the ignition timing, and the like are electrically controlled, and the torque and the rotational speed are electrically controlled accordingly.

  A collinear diagram of the single pinion type planetary gear mechanism constituting the power split mechanism 41 is shown in FIG. In the so-called normal hybrid mode in which the power output from the engine 40 is divided into the output shaft 42 side and the first motor / generator 43 side, the first motor / generator 43 functions as a generator as shown by the solid line in FIG. The torque generated by the power generation acts on the sun gear 44 as a so-called reaction torque. Along with this, a torque obtained by amplifying the engine torque is generated in the ring gear 45 as an output element. Further, the electric power obtained by the first motor / generator 43 is supplied to the second motor / generator 47 so that the second motor / generator 47 functions as a motor, and the output torque is output via the transmission unit 48 to the output shaft 42. Is transmitted to. That is, a part of the power output from the engine 40 is transmitted to the output shaft 42 via the power split mechanism 41, and other power is once converted into electric power and then converted into mechanical power again. It is transmitted to the output shaft 42.

  When the engine load gradually decreases, the rotational speed of the sun gear 44, that is, the first motor / generator 43 is decreased. This is because the rotational speed of the engine 40 is controlled to a rotational speed with good fuel efficiency. Finally, the driving state is reached in which the rotational speed of the sun gear 44 is set to “0”. In this case, instead of generating the reaction torque by the first motor / generator 43, the brake 1 is engaged and the brake 1 Thus, a reaction torque for fixing the sun gear 44 is generated. This state is shown by a one-dot chain line in FIG. By doing so, it is not necessary to control the torque of the first motor / generator 43, and energy loss can be suppressed.

  When the vehicle speed of a vehicle equipped with the above hybrid drive device further increases and the engine load is relatively small, the first motor / generator 43 is caused to function as a motor in order to prevent overreving of the engine 40. The sun gear 44 is rotated in the opposite direction to the engine 40. This state is indicated by a broken line in FIG. In this case, the second motor / generator 47 functions as a generator to perform energy regeneration, and the electric power is supplied to the first motor / generator 43.

  Of the drive modes described above, in the mode in which the first motor / generator 43 functions as a generator or a motor, the engine speed continuously changes in accordance with the speed of the first motor / generator 43. The gear ratio can be changed steplessly. Therefore, such a drive mode can be referred to as a continuously variable transmission mode. On the other hand, in the state where the sun gear 44 is fixed by the brake 1, the engine speed cannot be changed by the first motor / generator 43. Therefore, the drive mode can be referred to as a fixed speed change mode.

  When switching from such a fixed speed change mode to a continuously variable speed change mode, the reaction torque that has been handled by the brake 1 is received by the first motor generator 43 and the brake 1 is released. The control device according to the present invention executes the release control of the brake 1 in such a case as described below. FIG. 1 is a flowchart for explaining an example of the control, and is repeatedly executed every predetermined short time when the determination to release the brake 1 is established. The release determination can be made based on, for example, the vehicle speed, the engine speed, the charge capacity of the power storage device, the drive request amount such as the accelerator opening, and the like.

  When the determination to release the engaged brake 1 capable of transmitting torque is established as described above, first, the operating point after release is calculated (step S1). One example of this operating point is driving to output the engine power required at that time with optimum fuel consumption. The requested fuel consumption such as the accelerator opening and the vehicle speed and the optimum fuel consumption line ( Or a map).

  As described with reference to FIG. 6 above, the relationship between the engine speed and the number of rotations of the first motor / generator 43 and the relationship between these torques are determined by the planetary gear mechanism constituting the power split mechanism 41. Since the relationship is defined by the gear ratio (ratio between the number of teeth of the sun gear 44 and the number of teeth of the ring gear 45), the target rotational speed of the first motor / generator 43 is determined according to the operating point obtained in step S1. . In step S2, the control target value of the rotation speed thus obtained is set. Rotational speed feedback (F / B) control based on the deviation between the target value and the actual rotational speed is executed (step S3). This rotational speed feedback control includes a proportional operation (P operation) and an integration operation (I operation), or adds a differential operation (D operation) to the first motor / generator 43 in the same manner as normal feedback control. In this invention, the integration operation is stopped during the release control of the brake 1, that is, until the determination of the release of the brake 1 is established. The integral operation is for eliminating the steady-state deviation or reducing its influence on the control amount. In the case of the brake 1 release control described here, the first operation is performed while the brake 1 is engaged. This is because the rotation of the 1-motor / generator 43 stops and a steady deviation occurs, and if the integration operation is continued, the value of the integral term may become excessively large.

  Then, an engagement element release instruction, that is, an instruction to release the brake 1 is started (step S4). In the brake 1 having the configuration shown in FIG. 3, the current flowing through the electromagnetic coil 5 is gradually reduced. While the braking torque corresponding to the current value is larger than the torque acting on the sun gear 44, the first motor / generator 43 and the sun gear 44 to which the first motor / generator 43 is coupled are stopped without rotating. When the torque acting on the sun gear 44 is reduced, the brake 1 slips and the first motor / generator 43 and the sun gear 44 start to rotate gradually. Therefore, in step S5, it is determined whether or not the absolute value of the difference between the target rotational speed and the actual rotational speed (measured rotational speed) is smaller than a predetermined threshold value. The actual rotational speed can be detected by a resolver (not shown) attached to the first motor / generator 43, and an appropriate rotational speed sensor is provided to detect the actual rotational speed. Also good. Further, this step S5 is for determining that the brake 1 is approaching the released state, and therefore the threshold value may be a value set appropriately in design.

  If the absolute value of the rotational speed difference is greater than or equal to the threshold value and a negative determination is made in step S5, the control in step S4, that is, the release instruction is continued. On the other hand, if the absolute value of the rotational speed deviation falls below the threshold value and is affirmatively determined in step S5, the instruction value of the torque applied from the first motor / generator 43 to the sun gear 44 (after feedback calculation) It is determined whether or not (value) is equal to or less than a predetermined threshold (reference value), that is, whether or not the threshold is exceeded (step S6). This torque is a negative torque because it replaces the torque applied to the sun gear 44 by the brake 1. Therefore, in step S6, whether or not the absolute value of the indicated torque has exceeded the reference value, in other words, It is determined whether or not the command torque value has increased beyond the reference value in the negative direction. The reference value is a criterion for determining that the brake 1 has been substantially released or has become very close to the released state, and executes appropriate control following the release of the brake 1. Also, it can be determined in advance by experiments or simulations based on the fact that there is no inconvenience such as shock.

  If a negative determination is made in step S6 because the command torque exceeds the reference value, the previous control state is continued by returning to step S5. On the contrary, if a positive determination is made in step S6, a release prior determination is established (step S7). This pre-release determination is a “pre-release” release determination in the sense that there is a difference corresponding to the reference value (threshold value) between the command torque value and the required torque after the brake 1 is released. Therefore, if the above-described reference value is small enough not to cause trouble in the control following the release of the brake 1, it can be handled as a release determination.

  In the control example shown in FIG. 1, it is determined whether or not a certain time has elapsed after performing the release prior determination (step S <b> 8). This fixed time is set in advance as a time required for eliminating the difference corresponding to the above-described reference value between the indicated torque value and the required torque after release. Since it is set and the above reference value is a value determined by design, the above-mentioned fixed time can be determined from these values. If the elapsed time from the time when the release pre-determination is established does not reach this fixed time and is determined negative in step S8, the previous control state is continued, such as returning to step S7. On the other hand, if the predetermined time has elapsed and the determination in step S8 is affirmative, the brake 1 has been completely released. In this case, the calculation of the integral term is resumed (step S9). ). That is, the integration operation is restored.

  An example of changes in the rotational speed, torque, etc. when the above control is performed is shown in FIG. In a state where the brake 1 is engaged, the measured engagement element relative rotational speed is “0”. Here, the engagement element relative rotation speed is a relative rotation speed between the fixed-side member and the movable-side member of the brake 1. In addition, since the rotational speed feedback control is not started in the state before the target rotational speed is obtained, the engagement element section instruction torque value, that is, the instruction torque value of the first motor / generator 43 that rotates the sun gear 44 is “ 0 ". Furthermore, the engagement element torque capacity, that is, the torque capacity of the brake 1 has a predetermined negative value because it is a capacity that handles negative torque.

  In this state, when the determination to release the brake 1 is established, for example, by the determination to switch from the fixed transmission mode to the continuously variable transmission mode described above, the rotational speed feedback control (F / B) is started (time t1). At the same time, the command torque value is output so as to eliminate the deviation between the target rotational speed and the actual rotational speed. In the example shown in FIG. 2, the command torque value is decreased by a predetermined decrease range. In other words, the command torque value is increased in the negative direction and maintained at that value. An engagement element release instruction for releasing the brake 1 is executed at time t2 immediately after that. Specifically, the current value of the electromagnetic coil 5 with which the brake 1 is engaged is reduced. The reduction control is executed with first-order lag control or smoothing control with respect to the target value so that the torque capacity of the brake 1 gradually decreases. Accordingly, the torque capacity smoothly increases from a predetermined negative value toward “0” as shown in FIG. That is, the absolute value of torque capacity gradually decreases.

  Since the torque is applied to the sun gear 44 so as to set this as the target rotational speed, the torque is also applied to the brake 1 connected to the sun gear 44, so that the torque capacity is reduced. When the torque is lower than the torque acting on the brake 1, the brake 1 slips (at time t3). That is, the engagement element relative rotational speed gradually increases and approaches the target value. At the same time, the command torque value is further reduced. That is, it is increased in the negative direction. As described above, the decrease in the command torque value causes the absolute value of the deviation between the target rotation speed and the actual rotation speed to fall below the threshold at the time t4. As a result, the command torque value after the time t4 is reduced. The determination is started.

  The command torque value is decreased with a design-designed tendency or gradient, and when the value reaches the reference value described above (at time t5), the release pre-determination is established. The brake 1 is released at a time t6 when a predetermined time has elapsed from the time t5, and the integration operation is restarted from this time.

  Therefore, according to the control device according to the present invention configured to execute the above-described control, the target rotational speed is set and the rotational speed feedback control is performed so as to become the target rotational speed, and the instruction torque in the process Since the release of the engagement device such as the brake 1 is determined based on the value, it is possible to easily and accurately determine the release of the engagement device without performing torque adjustment using a detector such as a torque sensor. Further, in the control device according to the present invention, the release of the engagement device is determined using the rotation speed feedback control that changes the actual rotation speed toward the target value, so that quick control is possible. Therefore, it is possible to improve the control responsiveness of the shift control and the driving force control accompanied by the release of the engaging device.

  In particular, when the release determination based on the command torque value is performed after the rotation speed deviation has decreased to a predetermined value or less, the release determination is affected by fluctuation or decrease in the command torque value due to disturbance or the like. It is difficult to prevent or suppress erroneous determination. Furthermore, since the integral operation (calculation of the integral term) in the feedback control is stopped before the rotational speed feedback control is executed and the release determination is established, a control amount for eliminating or reducing the steady-state deviation is generated. Therefore, the command torque value does not increase and the torque related to the engagement device does not increase, the durability of the friction surface does not decrease, and the command torque value and the torque in the engagement device do not increase. Correlation with capacity can be taken, and the accuracy of release determination control is improved. Since the release determination is performed based on the command torque value in the process of performing the rotational speed feedback control toward the target rotational speed after release, in addition to being able to make the release determination quickly, the rotation after release When the engagement device is released for shifting and controlling the driving force, the shift response and the driving force control response can be improved.

  As described in the above specific example, in a state where the brake 1 is engaged and the sun gear 44 is fixed, the first motor / generator 43 connected to the sun gear 44 outputs torque and rotates. Perform number feedback control. For this reason, the load on the drive device used for the rotational speed feedback control such as the first motor / generator 43 may become large. In the present invention, the temperature of the drive device is detected by measuring or calculating it. When the detected temperature exceeds a predetermined reference temperature, the instruction torque value for the drive device is reduced. In this way, it is possible to prevent or suppress a decrease in durability of the drive device.

  Here, the relationship between the present invention and the specific example described above will be briefly described. The functional means for executing the control in step S3 described above corresponds to the feedback control means in the present invention, and the control in steps S6 and S7. The functional means for executing is equivalent to the release determination means in the present invention. Further, the functional means for executing the control for reducing the command torque value based on the temperature of the drive device corresponds to the torque reduction means in this invention.

  On the other hand, when the electromagnetic engagement device targeted in the present invention is used as a brake in a hybrid drive device, the hybrid drive device is not limited to the configuration shown in FIG. 5 described above. For example, the present invention can be used in a hybrid drive device configured as shown in FIG. The example shown in FIG. 7 is an example in which the power split mechanism 41 is configured by a so-called composite planetary gear mechanism that includes a set of single pinion type planetary gear mechanisms and a set of double pinion type planetary gear mechanisms. The carrier 46 in the single pinion type planetary gear mechanism to which the reference numeral 40 is connected is connected to the ring gear 51 in the double pinion type planetary gear mechanism, and the ring gear 45 in the single pinion type planetary gear mechanism connected to the output shaft 42 is the double pinion. It is connected to the carrier 52 in the type planetary gear mechanism. A sun gear 53 in the double pinion type planetary gear mechanism is connected to the brake 1. The other configuration is the same as the configuration shown in FIG. 6, and the same reference numerals as those in FIG. 6 are attached to FIG.

  Also in the hybrid drive device configured as described above, by engaging the brake 1, the torque that the first motor / generator 43 is responsible for can be applied to the brake 1 and the first motor / generator 43 can be energized or Power generation by one motor generator 43 can be stopped.

  Further, the example shown in FIG. 8 is an example in which the arrangement of the components of the hybrid drive device shown in FIG. 6 is changed to be suitable for a front engine front wheel drive vehicle (FF vehicle), and therefore FIG. 8 is similar to FIG. The reference numerals are attached and the description is omitted. In the example shown in FIG. 8, the transmission unit 48 is configured by a single pinion type planetary gear mechanism 55 to which a carrier is fixed. A counter gear pair 56 is provided in place of the output shaft 42, and power is output to the front differential 57 via the counter gear pair 56.

  Furthermore, the present invention is not limited to the above-described specific examples, and can be applied to a release control device for an electromagnetic engagement device used as a clutch in addition to a brake, and can be applied to a hybrid drive or a vehicle transmission. The present invention can be applied to a release control device intended for an electromagnetic engagement device used as an engagement device other than the engagement device in FIG.

  DESCRIPTION OF SYMBOLS 1 ... Brake, 2 ... Rotary shaft, 5 ... Electromagnetic coil, 6 ... Yoke, 7 ... Brake hub, 20 ... Clutch, 31 ... Electromagnetic coil, 32 ... Yoke, 40 ... Engine, 41 ... Power split mechanism, 43 ... 1st Motor generator 47: Second motor generator.

Claims (4)

In a release control device for an electromagnetic engagement device that is disposed between a predetermined rotating member and another member and transmits torque between the predetermined rotating member and the other rotating member by a frictional force corresponding to the electromagnetic force. ,
When the release determination for switching the electromagnetic engagement device from the engagement state capable of transmitting torque to the release state interrupting torque transmission is established, the electromagnetic engagement device is engaged. Target rotational speed setting means for obtaining a target rotational speed of the predetermined rotating member after releasing
Feedback control means for feedback-controlling the rotational speed of the predetermined rotating member based on the deviation between the target rotational speed and the actual rotational speed;
An instruction torque value of a driving force source that rotates the predetermined rotating member when the number of rotations of the predetermined rotating member is released by reducing the electromagnetic force after feedback control is started by the feedback control means is predetermined. A release control device for an electromagnetic engagement device, comprising: release determination means for determining release of the electromagnetic engagement device based on exceeding a reference value.   The feedback control means includes means for executing feedback control for performing an integration operation and stopping the integration operation until the release determination means determines that the electromagnetic engagement device is released. The release control device for an electromagnetic engagement device according to claim 1.   The release determination means determines whether the indicated torque value of the driving force source has exceeded a predetermined reference value after the difference between the actual rotational speed of the predetermined rotating member and the target rotational speed is equal to or less than a predetermined value. 3. The release control device for an electromagnetic engagement device according to claim 1, further comprising means for starting determination of whether or not.   The electromagnetic engagement according to any one of claims 1 to 3, further comprising torque reduction means for reducing the indicated torque value when the temperature of the driving force source is equal to or higher than a predetermined reference temperature. Device release controller.

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