JP2015190491A - Control device and control method for power transmission device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for a power transmission device and perform an effective restriction of occurrence of drag toque at the time of performing a shift operation.SOLUTION: This invention comprises: an engine 10; a wet-type clutch 25 including a clutch plate 26 for cutting or connecting a rotational force transmitted from the engine 10; a change gear 30 for changing a rotational force transmitted from the wet-type clutch 25 under a prescribed transmission ratio; hydraulic circuits 40, 70 for supplying lubricant oil to the clutch plate 26; and a control valve 49 arranged in the hydraulic circuit 40 capable of shutting off the supply of lubricant oil to the clutch plate 26. After starting a speed changing operation of the change gear 30, supplying of lubricant oil to the clutch plate 26 is shut off by keeping a closed state of the control valve 49 until completion of synchronization of the change gear 30.

Description

  The present invention relates to a control device and a control method for a power transmission device, and more particularly to a control device and a control method for a power transmission device including a wet clutch.

  Conventionally, a power transmission device including a wet clutch capable of connecting / disconnecting power transmitted from an engine to a transmission is known (see, for example, Patent Documents 1 and 2). The wet clutch has the advantage of being excellent in wear resistance and cooling performance as compared with the dry clutch because the clutch plate is lubricated with lubricating oil.

JP 2001-239850 A JP 2003-148607 A

  FIG. 4 shows a general power transmission device in which a wet clutch 112 is interposed between the engine 100 and the transmission 113. Lubricating oil is always supplied to the clutch plate C10 of the wet clutch 112 from a hydraulic circuit (not shown). Therefore, during the speed change operation of the transmission 113, drag torque due to the lubricating oil is generated on the input shaft 114, the input gear 115, the countershaft 116, the output gear 117, etc., and the synchronization of the synchro mechanism 120 may be hindered to cause synchronization loss. There is.

  In order to reduce such drag torque, it is conceivable to limit the supply of lubricating oil to the clutch plate C10. However, for this purpose, a new valve is added to the hydraulic circuit, which increases the cost of the apparatus. There are also challenges.

  An object of the present invention is to provide a control device and a control method for a power transmission device that can effectively suppress drag torque generation during a shift operation and prevent synchronization loss.

  In order to achieve the above object, the present invention shifts an engine, a wet clutch including a clutch plate for connecting and disconnecting rotational power transmitted from the engine, and a rotational power transmitted from the wet clutch at a predetermined speed ratio. Control device for a power transmission device, comprising: a transmission that performs the above operation; a hydraulic circuit that supplies lubricating oil to the clutch plate; and a control valve that is provided in the hydraulic circuit and can shut off the supply of the lubricating oil to the clutch plate The control valve is kept closed until the synchronization of the transmission is completed after the transmission operation of the transmission is started, and the supply of lubricating oil to the clutch plate is shut off.

  The hydraulic circuit further includes a fluid coupling with a lock-up clutch interposed between the engine and the wet clutch, and the hydraulic circuit further supplies hydraulic oil for connecting and disconnecting the lock-up clutch to the lock-up clutch. The control valve may have a fully closed position that cuts off at least the supply of hydraulic oil to the lockup clutch and the supply of lubricating oil to the clutch plate.

  The present invention also includes an engine, a wet clutch including a clutch plate for connecting and disconnecting rotational power transmitted from the engine, a transmission for shifting the rotational power transmitted from the wet clutch at a predetermined gear ratio, In a control method of a power transmission device, comprising: a hydraulic circuit that supplies lubricating oil to a clutch plate; and a control valve that is provided in the hydraulic circuit and that can cut off the supply of lubricating oil to the clutch plate. After starting the shift operation, the control valve is kept closed until the synchronization of the transmission is completed, and the supply of lubricating oil to the clutch plate is shut off.

  According to the control device and the control method of the power transmission device of the present invention, it is possible to effectively suppress the generation of drag torque during the shift operation and prevent the synchronization loss.

It is a typical whole lineblock diagram showing the power transmission device concerning one embodiment of the present invention. It is a circuit diagram showing a hydraulic circuit concerning one embodiment of the present invention. It is a flowchart explaining the action | operation at the time of the speed change of the power transmission device which concerns on one Embodiment of this invention. It is a figure explaining generation | occurrence | production of the drag torque resulting from the drag resistance of lubricating oil in a general power transmission device.

  Hereinafter, based on an accompanying drawing, a control device and a control method of a power transmission device concerning one embodiment of the present invention are explained. The same parts are denoted by the same reference numerals, and their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  First, a schematic configuration of the power transmission device according to the present embodiment will be described with reference to FIG.

  As shown in FIG. 1, a transmission 30 is connected to the engine 10 via a clutch mechanism 20. The clutch mechanism 20 includes a fluid coupling (torque converter) 21 and a wet multi-plate clutch 25 in order from the upstream side of the power transmission path.

  The fluid coupling 21 includes a pump 22 connected to the crankshaft 11 of the engine 10, and a turbine 23 disposed opposite to the pump 22 and connected to the input side of the wet multi-plate clutch 25. The fluid coupling 21 is provided with a lock-up clutch 24 that connects and disconnects power transmission between the pump 22 and the turbine 23. The lockup clutch 24 is connected and disconnected by hydraulic pressure supplied from a hydraulic circuit 40 (see FIG. 2), which will be described in detail later.

  The wet multi-plate clutch 25 has a clutch plate 26 and connects and disconnects power transmission between the fluid coupling 21 and the transmission 30. The clutch plate 26 has an input side connected to the turbine 23 and an output side connected to the transmission 30 input shaft 31. Lubricating oil is supplied to the clutch plate 26 from a hydraulic circuit 40 and a clutch lubrication circuit 70 (see FIG. 2). The wet multi-plate clutch 25 is normally urged in the disconnecting direction by a return spring 42 (see FIG. 2), and the piston 27 is moved by the operating oil pressure from the hydraulic circuit 40 (see FIG. 2), and each clutch plate 26 is moved. It is made contact by pressing.

  The transmission 30 is arranged in parallel with the input shaft 31 to which rotational power is transmitted from the wet multi-plate clutch 25, the output shaft 32 arranged coaxially with the input shaft 31, and the input shaft 31 and the output shaft 32. And a countershaft 33. An input gear 34 is provided on the input shaft 31. The output shaft 32 is provided with a plurality of output gears 36, and the output shaft 32 and the output gear 36 are engaged with each other by synchronizing the rotation of the output shaft 32 and the rotation of the output gear 36 between the output gears 36. A synchronization mechanism 37 is provided.

  The electronic control unit 80 executes connection / disconnection control of the lockup clutch 24 and the wet multi-plate clutch 25 and shift control of the transmission 30 based on detection values of various sensors provided in each part of the power transmission device. . Various sensors include an engine rotation sensor 81 that detects the rotation speed of the crankshaft 11 of the engine 10, a vehicle speed sensor 82 that detects the rotation speed of the output shaft 32 of the transmission 30, and a shift lever (not shown) operated by the driver. There is a shift lever sensor 83 and the like for detection.

  Next, details of the hydraulic circuit 40 of the present embodiment will be described with reference to FIG.

  As shown in FIG. 2, the hydraulic circuit 40 includes a supply line 46 that is connected to an oil pan 45 and includes a filter F and an oil pump OP. The oil pump OP is connected to the crankshaft 11 (see FIG. 1) of the engine 10, and the oil in the oil pan 45 is supplied to the supply line 46 when the engine 10 is driven. The oil pressure in the supply line 46 is maintained at a preset pressure by the relief valve 47.

  A lockup clutch control valve 49 is connected to the supply line 46 via a line 48. The lockup clutch control valve 49 can control the connection and disconnection of the lockup clutch 24 by switching the direction of oil flowing to the lockup clutch 24. The lockup clutch control valve 49 is connected to oil return lines 50 and 60 for returning the oil that has passed through the lockup clutch 24 to the oil pan 45. The oil return line 50 is provided with a throttle valve 51, a cooler 52, a relief valve 53, and a clutch lubrication circuit 70. The clutch lubrication circuit 70 supplies lubricating oil to each clutch plate 26 (see FIG. 1) of the wet multi-plate clutch 25.

  The valve position of the lockup clutch control valve 49 is controlled to a first valve opening position, a second valve opening position, and an intermediate position by a signal oil pressure supplied from a signal line 55 connected to the supply line 46. The signal line 55 is provided with a lockup solenoid valve 56 (ON / OFF valve) for switching between supply and discharge of signal oil to the lockup clutch control valve 49.

  The lock-up solenoid valve 56 is closed by the urging force of the spring 57 when not energized (OFF) and opened when energized (ON) by the electronic control unit 80.

  When the lock-up solenoid valve 56 is closed (OFF), no signal oil is supplied to the lock-up clutch control valve 49, and the lock-up clutch control valve 49 is in the state shown in FIG. Position. In this case, the pressure oil from the line 48 flows to the oil discharge line 76, the lockup clutch 24, and the oil supply line 77, and returns from the oil return line 50 to the oil pan 45 through the clutch lubrication circuit 70. In this case, the pressure oil flowing in the lockup clutch 24 operates the lockup clutch 24 in the disconnecting direction.

  On the other hand, when the electromagnetic valve 56 is open (ON), signal oil is supplied from the signal line 55 to the lockup clutch control valve 49, and the lockup clutch control valve 49 is switched to the second open position. Then, the pressure oil from the line 48 flows to the oil supply line 77, the lockup clutch 24, and the oil discharge line 76, and returns from the oil return line 60 to the oil pan 45. In this case, the hydraulic pressure flowing in the lockup clutch 24 operates the lockup clutch 24 in the contact direction. At this time, a part of the oil flowing from the line 48 to the oil supply line 77 returns to the oil pan 45 from the branch line 58 via the oil return line 50 and the clutch lubrication circuit 70.

  Further, when the lockup solenoid valve 56 is controlled by the electronic control unit 80 and the lockup clutch control valve 49 is switched to the intermediate position, the lines 76, 77, 48, 50, 60 are all closed, Oil supply to the lockup clutch 24 and the clutch lubrication circuit 70 is cut off.

  Further, a wet multi-plate clutch control valve 61 is connected to the supply line 46 via a line 68. With this wet clutch control valve 61, the wet multi-plate clutch 25 can be connected / disconnected by switching the supply / discharge of hydraulic oil to / from the wet multi-plate clutch 25.

  The wet multi-plate clutch control valve 61 is switched by an electromagnetic valve 63 provided on a signal line 62 connected to the supply line 46.

  That is, as shown in the figure, when the electromagnetic valve 63 is opened by the electronic control unit 80, the set pressure pressure oil is supplied from the signal line 62 to the wet multi-plate clutch control valve 61, and the wet multi-plate clutch control valve 61. Is the valve closing position. Therefore, no hydraulic oil is supplied to the wet multi-plate clutch 25, and the piston 27 of the wet multi-plate clutch 25 is operated to the disconnected side by the urging force of the return spring 42.

  On the other hand, when the electromagnetic valve 63 is closed, the wet multi-plate clutch control valve 61 is switched to the valve open position. As a result, hydraulic oil is supplied to the wet multi-plate clutch 25 through the oil supply line 69, and the piston 27 is moved against the urging force of the return spring 42, and the wet multi-plate clutch 25 is operated to the contact side. The In this way, the open / close control of the electromagnetic valve 63 by the electronic control unit 80 allows the wet multi-plate clutch 25 to be connected / disconnected.

  Next, based on the flowchart shown in FIG. 3, the operation | movement at the time of the speed change of the power transmission device which concerns on this embodiment is demonstrated.

  In step S1, it is determined whether or not the speed change operation of the transmission 30 has started. If the speed change operation has started, the process proceeds to step S2. If the speed change operation has not started, the process returns.

  In step S2, the supply of lubricating oil to the clutch lubricating circuit 70 is shut off by setting the lockup clutch control valve 49 to the intermediate position. That is, the supply of lubricating oil to the clutch plate 26 of the wet multi-plate clutch 25 is interrupted, and the lubricating oil between the clutch plates 26 is discharged (or reduced).

  In step S3, the wet multi-plate clutch control valve 61 is switched to the valve closing position, and the supply of hydraulic oil to the wet multi-plate clutch 25 is stopped. That is, the piston 27 of the wet multi-plate clutch 25 is separated from the clutch plate 26 by the urging force of the return spring 42, and the wet multi-plate clutch 25 is disconnected. In addition, by cutting off the lubricating oil to the clutch plate 26 (step S2) prior to step S3, after the wet multi-plate clutch 25 is disconnected, the input shaft 31 and the auxiliary shaft 33 are inertially rotated by drag torque. This can be effectively suppressed.

  In step S4, the output shaft 32 and the output gear 36 are synchronously engaged by the synchronization mechanism 37 of the transmission 30.

  In step S5, it is determined whether or not the synchronous engagement between the output shaft 32 and the output gear 36 by the synchro mechanism 37 has been completed. When the synchronous engagement is completed, the process proceeds to step S6.

  In step S6, the supply of lubricating oil to the clutch lubrication circuit 70 is resumed by setting the lockup clutch control valve 49 to the first valve opening position (or the second valve opening position). That is, lubricating oil is supplied to the clutch plate 26 of the wet multi-plate clutch 25.

  In step S7, the wet multi-plate clutch control valve 61 is switched to the open position, and the supply of hydraulic oil to the wet multi-plate clutch 25 is resumed. That is, the piston 27 of the wet multi-plate clutch 25 moves against the urging force of the return spring 42 and starts to press the clutch plate 26 (half-clutch). Thereafter, in step S8, the piston 27 completes engagement (clutch engagement) of the clutch plate 26 and returns.

  Next, the effects of the control device and control method for the power transmission device of this embodiment will be described.

  In this embodiment, when the speed change operation of the transmission 30 is started, the supply of the lubricating oil to the clutch plate 26 of the wet multi-plate clutch 25 is interrupted until the synchronous engagement by the sync mechanism 37 is completed. That is, since no lubricating oil is supplied to the clutch plate 26, the drag resistance of the clutch plate 26 due to the lubricating oil is reduced. As a result, it is possible to effectively suppress the generation of drag torque that becomes a load when the transmission 30 is synchronized, and the synchronization loss can be reliably prevented.

  In the present embodiment, the supply of the lubricating oil to the clutch plate 26 of the wet multi-plate clutch 25 is cut off by setting the lock-up clutch control valve 49 to the intermediate position. That is, the control valve for controlling the supply of hydraulic oil to the lockup clutch 24 and the control valve for controlling the supply of lubricating oil to the wet multi-plate clutch 25 are integrated (common) without being provided separately. The entire apparatus can be simply configured, and an increase in cost can be effectively suppressed.

  In addition, this invention is not limited to the above-mentioned embodiment, In the range which does not deviate from the meaning of this invention, it can change suitably and can implement.

  For example, the wet multi-plate clutch 25 is not limited to a single clutch, and may be a dual clutch. In this case, the same effects as those of the above-described embodiment can be obtained.

DESCRIPTION OF SYMBOLS 10 Engine 20 Clutch mechanism 21 Fluid coupling 24 Lockup clutch 25 Wet multi-plate clutch 30 Transmission 40 Hydraulic circuit 49 Lockup clutch control valve 56 Lockup solenoid valve 70 Clutch lubrication circuit 80 Electronic control unit

Claims (3)

An engine, a wet clutch including a clutch plate for connecting and disconnecting rotational power transmitted from the engine, a transmission for shifting the rotational power transmitted from the wet clutch at a predetermined gear ratio, and lubricating oil for the clutch plate In a control device for a power transmission device, comprising: a hydraulic circuit to supply; and a control valve provided in the hydraulic circuit and capable of shutting off the supply of lubricating oil to the clutch plate;
A control device for a power transmission device, wherein after the transmission operation of the transmission is started, the control valve is kept closed until the synchronization of the transmission is completed, and supply of lubricating oil to the clutch plate is shut off. A fluid coupling with a lock-up clutch interposed between the engine and the wet clutch;
The hydraulic circuit further supplies hydraulic oil for connecting and disconnecting the lockup clutch to the lockup clutch;
The control device for a power transmission device according to claim 1, wherein the control valve has a fully closed position that cuts off at least supply of hydraulic oil to the lockup clutch and supply of lubricant to the clutch plate. An engine, a wet clutch including a clutch plate for connecting and disconnecting rotational power transmitted from the engine, a transmission for shifting the rotational power transmitted from the wet clutch at a predetermined gear ratio, and lubricating oil for the clutch plate In a control method of a power transmission device comprising: a hydraulic circuit to be supplied; and a control valve that is provided in the hydraulic circuit and permits or shuts off the supply of lubricating oil to the clutch plate.
A control method for a power transmission device, wherein after the shifting operation of the transmission is started, the control valve is kept closed until the synchronization of the transmission gear is completed, and the supply of lubricating oil to the clutch plate is shut off.

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