JP2016155470A - Pto system and method for controlling pto system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a PTO system using a dual clutch system, which can reduce an influence to installed equipment without causing torque variation at the time of gear change during transmission of power from an internal combustion engine to a PTO shaft, and select an optimal gear reduction ratio relative to expected effects such as noise reduction and a fuel economy, and a method for controlling a PTO system.SOLUTION: The PTO system is configured to perform power transmission between an internal combustion engine 10 and a counter shaft 12a at a first gear reduction ratio GR1 when bringing a first clutch 11a into an engagement condition and to perform power transmission between the internal combustion engine 10 and the counter shaft 12a at a second gear reduction ratio GR2 smaller than the first gear reduction ratio GR1 when bringing a second clutch 11b into an engagement condition.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a PTO system that transmits part of the power of an internal combustion engine to a bodywork facility via a dual clutch, a transmission, and a PTO shaft, and a method for controlling the PTO system.

  Generally, a vehicle including an internal combustion engine such as a diesel engine travels by transmitting engine power to wheels via a transmission. Usually, a clutch is disposed between the engine and the transmission, and the power transmission between the engine and the transmission is controlled by switching the connection / disconnection state of the clutch.

  Here, large-sized vehicles such as fire fighting vehicles and dump trucks are provided with bodywork equipment for performing water discharge work for fire extinguishing and tilting work of the loading platform, that is, for performing work other than traveling of the vehicle. In this bodywork equipment, a PTO (PTO: power take-off) shaft that drives this bodywork equipment is connected to the output shaft of the transmission, and when using the PTO, it is provided between the PTO shaft and the output shaft. In the connected state, a part of the engine power is supplied via a clutch between the engine and the transmission.

  In the prior art, this clutch is configured as a single clutch, and power is transmitted between the engine and the transmission by turning this single clutch on / off. When the bodywork equipment is connected to the PTO shaft, Since the power transmission between the motor and the output shaft is performed with a single gear reduction ratio, if the torque at the time of starting on the PTO side is large, sufficient torque cannot be transmitted to the PTO shaft when the clutch is connected, There has been a concern that starting may be difficult and noise may be generated or fuel consumption may deteriorate.

  In this connection, in the PTO transmission system of the tractor, a PTO clutch is provided in front of the PTO transmission, and a speed increasing clutch is provided adjacent to the PTO clutch, so that the engine rotational speed fluctuates slightly. When the speed-up clutch is set to “ON”, the speed of the PTO input shaft is increased by the speed-up part that transmits the rotation of the PTO input shaft to the PTO transmission part through the meshing of the gear. A PTO rotation speed control device has been proposed (see, for example, Patent Document 1).

  On the other hand, a dual clutch system having a first clutch and a second clutch has been developed and used with two clutches between the engine and the transmission. The dual clutch system is configured such that the gear reduction ratio with the first clutch connected is different from the gear reduction ratio with the second clutch connected (see, for example, Patent Document 2).

Japanese Patent Laid-Open No. 10-44798 JP2013-100060A

  When using the above dual clutch system, the present inventor selects the connection / disconnection state of each clutch included in the dual clutch when the bodywork equipment is connected to the PTO shaft or when the bodywork equipment is operated after the connection. As a result, it has been found that the range of the magnitude of torque that can be transmitted at the time of PTO start-up can be widened while avoiding the generation of noise and the deterioration of fuel consumption.

  The present invention has been made in view of the above, and an object of the present invention is to reduce the influence on the bodywork equipment without causing torque fluctuation during shifting in a PTO system using a dual clutch system. It is an object of the present invention to provide a PTO system and a control method for the PTO system that can be reduced and can select a more optimal reduction ratio with respect to expected effects such as noise reduction and fuel economy saving.

  In order to achieve the above object, a PTO system of the present invention transmits a part of power of an internal combustion engine to a countershaft of a transmission through a dual clutch having a first clutch and a second clutch, In the PTO system for transmitting from the countershaft to the bodywork equipment via the PTO shaft, when the first clutch is in a connected state, power transmission between the internal combustion engine and the countershaft is performed at a first gear reduction ratio. And when the second clutch is in the engaged state, power is transmitted between the internal combustion engine and the countershaft at a second gear reduction ratio smaller than the first gear reduction ratio. Composed.

  According to this configuration, since the reduction ratio can be switched by switching between the first clutch and the second clutch, torque fluctuation at the time of shifting is not caused, so that there is no influence on the bodywork equipment. In addition, by switching between the first clutch and the second clutch, it is possible to select a more optimal reduction ratio for expected effects such as noise reduction and fuel economy saving.

  Further, in the above PTO system of the internal combustion engine, when the control device that controls the PTO system starts transmission of power from the internal combustion engine to the PTO shaft, the first clutch is connected by the dual clutch. The second clutch is disengaged and the countershaft rotational acceleration is equal to or higher than a preset rotational acceleration, or the countershaft rotational speed is preset. When the rotation speed exceeds the first set rotational speed, the dual clutch is configured to switch the first clutch to the disengaged state and to control the second clutch to the connected state.

  According to this configuration, when the bodywork equipment is connected to the PTO shaft, the connection / disconnection state of each clutch included in the dual clutch is controlled, the first clutch is connected, and the PTO shaft is connected at the first gear reduction ratio. Since the transmission countershaft connected to is connected, a relatively large torque can be generated, and it is less likely to lose the required torque in the PTO shaft side installation equipment, and the range in which PTO can be started can be expanded. Further, noise at the time of clutch engagement can be reduced, and further, deterioration of the engine operating state can be avoided.

  Furthermore, when the start-up operation in the bodywork equipment is completed and the steady operation state is entered, and the transmission torque to the PTO shaft side becomes small, the connection to the second clutch is switched to the first one. Since the countershaft is rotated at a second gear reduction ratio that is smaller than this gear reduction ratio, changes in the engine operating state can be reduced, deterioration of fuel consumption can be prevented, and fuel consumption can be improved.

  Further, in the PTO system of the internal combustion engine, when the control device transmits the power from the internal combustion engine to the PTO shaft and operates the bodywork facility, the request for the bodywork facility is required. When the torque is equal to or greater than a preset set torque, or when the rotation speed of the counter shaft is less than a preset second set rotation speed, the first clutch is brought into a connected state, When the second clutch is disengaged and power is transmitted to the PTO shaft at the first gear reduction ratio, and the required torque of the bodywork equipment is less than the set torque, or the counter shaft When the rotational speed is equal to or higher than the second set rotational speed, the first clutch is disengaged, the second clutch is engaged, and the PTO shaft is powered by the second gear reduction ratio. Communicate A control configured to perform that can achieve the following effects.

  In other words, when the bodywork equipment is operated by transmitting power from the engine to the PTO shaft in the same way as when starting the bodywork equipment, the operation state of the PTO shaft is not changed significantly. The first clutch having a large gear reduction ratio and the second clutch having a small gear reduction ratio are selectively connected in accordance with the required rotational speed and the required torque. Can be improved.

  And the control method of the PTO system of the present invention for achieving the above object is that a part of the power of the internal combustion engine is transferred to the transmission countershaft via the dual clutch having the first clutch and the second clutch. In the control method of the PTO system for transmitting and transmitting from the countershaft to the bodywork equipment via the PTO shaft, when the first clutch is in the connected state, the internal combustion engine and the When power is transmitted between the countershafts and the second clutch is in a connected state, power is transmitted between the internal combustion engine and the countershaft with a second gear reduction ratio that is smaller than the first gear reduction ratio. It is the method characterized by performing.

  Further, in the control method of the PTO system, when transmission of power from the internal combustion engine to the PTO shaft is started, the first clutch is set to a connected state, and the second clutch is set to a disconnected state. When the dual clutch is engaged, power is transmitted between the internal combustion engine and the countershaft at a first gear reduction ratio, and the rotational acceleration of the countershaft is equal to or higher than a preset rotational acceleration. Or when the rotational speed of the countershaft is equal to or higher than a preset first rotational speed, the dual clutch is disengaged and the second clutch is engaged. To transmit power between the internal combustion engine and the countershaft at a second gear reduction ratio lower than the first gear reduction ratio.

  In the control method of the PTO system, when the bodywork equipment is operated by transmitting power from the internal combustion engine to the PTO shaft, a required torque of the bodywork equipment is set in advance. When the torque is equal to or greater than the set torque, or when the rotation speed of the countershaft is less than a preset second rotation speed, the first clutch is brought into the connected state, and the second clutch is In a disconnected state, power is transmitted to the PTO shaft at a first gear reduction ratio, and when the required torque of the bodywork equipment is less than the set torque, or the rotational speed of the countershaft is When the rotation speed exceeds the second set rotational speed, the first clutch is disengaged and the second clutch is engaged, and power is transmitted to the PTO shaft at a second gear reduction ratio.

  According to these methods, the same operational effects as the above PTO system can be achieved.

  According to the PTO system and the control method of the PTO system of the present invention, in the PTO system using the dual clutch system, the reduction ratio can be switched by switching between the first clutch and the second clutch. It will not cause any impact on the bodywork equipment. In addition, by switching between the first clutch and the second clutch, it is possible to select a more optimal reduction ratio for expected effects such as noise reduction and fuel economy saving.

  Furthermore, the clutch output torque of the transmission countershaft is selectively controlled by selectively controlling the connection / disconnection state of each clutch of the dual clutch when the clutch is engaged at the start of the bodywork equipment or when the bodywork equipment is operated after the clutch is connected. Further, by controlling the output rotation speed, it is possible to suppress the generation of noise when the clutch is connected, and to prevent the deterioration of the operating state of the internal combustion engine, thereby improving the fuel consumption.

It is a figure which shows an example of a structure of the PTO system of embodiment which concerns on this invention, and is a figure which shows the power transmission path | route at the time of the contact state of a 1st clutch. It is a figure which shows the power transmission path | route at the time of the contact state of the 2nd clutch in the PTO system of FIG.

  Hereinafter, a PTO system according to an embodiment of the present invention and a control method of the PTO system will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, a PTO system 1 according to an embodiment of the present invention includes an engine (internal combustion engine) 10, a dual clutch 11 including a first clutch 11a and a second clutch 11b, and a transmission. 12 are arranged in order, a PTO shaft 13 is connected to the counter shaft 12a of the transmission 12, and a part of the power P of the engine 10 is transferred to either the first clutch 11a or the second clutch 11b. The system is configured as a system that transmits the twelve countershafts 12a and the PTO shaft 13 to the bodywork equipment (not shown).

  Here, a power transmission path when the power P of the engine 10 is transmitted to the wheels (not shown) via the dual clutch 11 and the transmission 12 will be described. Each connection / disconnection state of the first clutch 11a and the second clutch 11b can be switched according to the operating state of the engine 10. However, when the dual clutch 11 is switched from the disconnection state to the connection state, normally, the engine Ten powers P are transmitted to the wheels (not shown) via the first clutch 11a, the counter shaft 12a, and the main shaft 12b. However, when a direct gear stage is used as the transmission gear stage of the transmission 12, the first clutch 11a is connected and the power P of the engine 10 is transmitted to the first clutch 11a and the main shaft without the counter shaft 12a. It transmits to a wheel via 12b.

  1 and 2, the torque converter 14 is disposed between the engine 10 and the dual clutch 11. However, the present invention can be applied to a case where the torque converter 14 is not provided, and will be described later. The effects of the present invention can be achieved.

  Further, as shown in FIG. 1, when the first clutch 11a is in the connected state, power transmission between the engine 10 and the countershaft 12a is performed at the first gear reduction ratio GR1, and FIG. As shown, when the second clutch 11b is in the connected state, power transmission between the engine 10 and the countershaft 12a is performed at a second gear reduction ratio GR2 that is smaller than the first gear reduction ratio GR1. .

  Moreover, the control apparatus 20 which controls the PTO system 1 is provided. The control device 20 may be incorporated in an engine control unit (ECU) that controls the operation state of the engine 10 in general, or may be provided independently.

  The PTO system 1 according to the embodiment of the present invention is configured so that the control unit 20 that controls the PTO system 1 starts with the dual clutch 11 when the transmission of power from the engine 10 to the PTO shaft 13 is started. When the clutch 11a of the counter shaft 12 is disengaged and the second clutch 11b is disengaged and the rotational acceleration αn of the countershaft 12 becomes equal to or higher than the preset rotational acceleration αnc, or the rotation of the countershaft 12 When the number Ne becomes equal to or higher than the first preset rotation speed Ne1, the dual clutch 11 performs control to switch the first clutch 11a to the disconnected state and switch the second clutch 11b to the connected state. Configure. Here, the set rotational acceleration αnc and the first set rotational speed Ne1 are set in advance to appropriate values through experiments or the like.

  Thereby, at the time of connection of the bodywork equipment to the PTO shaft 13, the connection / disconnection state of each clutch 11a, 11b provided in the dual clutch 11 is controlled, and the first clutch 11a is connected to thereby connect the first gear reduction ratio. Since the countershaft 12a of the transmission 12 connected to the PTO shaft 13 is connected with the GR1, a relatively large torque can be generated, and it is less likely to lose the required torque in the bodywork equipment on the PTO shaft 13 side, so that PTO start can be performed. Can be enlarged. Moreover, the noise at the time of clutch connection can be reduced, and the deterioration of the operating state of the engine 10 can be avoided.

  Furthermore, when the start-up operation in the bodywork equipment is finished and the steady operation state is entered, and the transmission torque to the PTO shaft 13 side becomes small, switch to the connection of the second clutch 11b, Since the countershaft 12a is rotated at the second gear reduction ratio GR2 that is smaller than the first gear reduction ratio GR1, the change in the engine operating state can be reduced, the deterioration of the fuel consumption can be prevented, and the fuel consumption can be improved. Can do.

  In the PTO system 1 described above, when the control device 20 transmits the power from the engine 10 to the PTO shaft 13 and operates the bodywork equipment, the required torque Tq of the bodywork equipment is When the torque is equal to or higher than the set torque Tqc, or when the rotational speed Ne of the countershaft 12a is less than the preset second rotational speed Ne2, the first clutch 11a is brought into the connected state. When the clutch 11b is disengaged and power is transmitted to the PTO shaft 13 at the first gear reduction ratio GR1, and the required torque Tq of the bodywork equipment is less than the set torque Tqc, or the counter shaft 11a When the rotational speed Ne becomes equal to or higher than the second set rotational speed Ne2, the first clutch 11a is disengaged, the second clutch 11b is engaged, and the second gear is reduced. Configured to perform control for transmitting the power to the PTO shaft 13 at a ratio GR2. Here, as with the first set speed Ne1, the second set speed Ne2 is set to an appropriate value in advance through experiments or the like, but is set to the same value as the first set speed Ne1. Also good.

  As a result, similarly to when starting the bodywork equipment, even when the power is transmitted from the engine 10 to the PTO shaft 13 to operate the bodywork equipment, the operating state of the engine 10 is not significantly changed. The first clutch 11a having a large gear reduction ratio and the second clutch 11b having a small gear reduction ratio are selectively connected in accordance with the required rotational speed and required torque Tq of the PTO shaft 13, so that the engine 10 is operated. Fuel consumption can be improved by avoiding large changes in the state.

  In the PTO system control method according to the embodiment of the present invention, a part of the power P of the engine 10 is transferred to the counter of the transmission 12 via the dual clutch 11 having the first clutch 11a and the second clutch 11b. This is a control method of the PTO system that transmits to the shaft 12a and transmits to the bodywork equipment from the counter shaft 12a via the PTO shaft 13.

  In this method, when the first clutch 11a is in the connected state, power is transmitted between the engine 10 and the counter shaft 12a at the first gear reduction ratio GR1, and the second clutch 11b is in the connected state. Sometimes, power transmission is performed between the engine 10 and the countershaft 12a at a second gear reduction ratio GR2 that is smaller than the first gear reduction ratio GR1.

  In this method, when transmission of power from the engine 10 to the PTO shaft 13 is started, the first clutch 11a is in the connected state, the second clutch 11b is in the disconnected state, and the dual clutch 11 is in the connected state. Power transmission between the engine 10 and the countershaft 12a at the first gear reduction ratio GR1, and when the rotational acceleration αn of the countershaft 12a becomes equal to or higher than a preset rotational acceleration αnc, or When the rotational speed Ne of the countershaft 12a becomes equal to or higher than a preset first rotational speed Ne1, the dual clutch 11 switches the first clutch 11a to the disconnected state and the second clutch 11b to the connected state. Thus, the engine 10 and the countershaft 12 at a second gear reduction ratio GR2 lower than the first gear reduction ratio GR1. This is a method for transmitting power between a.

  Further, in this PTO system control method, when the bodywork equipment is operated by transmitting power from the engine 10 to the PTO shaft 13, the required torque Tq of the bodywork equipment is set in advance. When the torque is equal to or greater than Tqc, or when the rotation speed Ne of the countershaft 12a is less than a preset second set rotation speed Ne2, the first clutch 11a is brought into a connected state, and the second clutch 11b is moved. When power is transmitted to the PTO shaft 13 at the first gear reduction ratio GR1 and the required torque Tq of the bodywork equipment is less than the set torque Tqc, or when the rotational speed Ne of the counter shaft 12a is When the second set rotational speed Ne2 or more is reached, the first clutch 11a is disengaged, the second clutch 11b is engaged, and the second gear reduction ratio GR2 is set. Transmitting power to the PTO shaft 13.

  According to the PTO system 1 and the PTO system control method configured as described above, in the PTO system 1 using the dual clutch system, the reduction ratios GR1 and GR2 can be switched by switching between the first clutch 11a and the second clutch 11b. For this reason, torque fluctuations at the time of shifting are not caused, so that there is no influence on the bodywork equipment. In addition, by switching between the first clutch 11a and the second clutch 11b, it is possible to select the optimum reduction ratios GR1 and GR2 for expected effects such as noise reduction and fuel economy saving.

  Further, when the clutch is connected at the start of the bodywork equipment or when the bodywork equipment is operated after the clutch is connected, the connection / disconnection state of each clutch 11a, 11b of the dual clutch 11 is selectively controlled to By controlling the output torque and the output rotation speed Ne of the countershaft 12a, it is possible to suppress the generation of noise when the clutch is connected and to prevent the deterioration of the operating state of the engine 10 and to improve the fuel consumption.

1 PTO system 10 engine (internal combustion engine)
11 Dual clutch 11a First clutch 11b Second clutch 12 Transmission 12a Counter shaft 12b Main shaft 13 PTO shaft 14 Torque converter 20 Controller P Engine power GR1 First gear reduction ratio GR2 Second gear reduction ratio Ne Counter Shaft rotation speed Ne1 First setting rotation speed Ne2 Second setting rotation speed αn Countershaft rotation acceleration αnc Setting rotation acceleration

Claims (6)

A part of the power of the internal combustion engine is transmitted to a transmission countershaft via a dual clutch having a first clutch and a second clutch, and is transmitted from the countershaft to a bodywork facility via a PTO shaft. In the system,
When the first clutch is in the connected state, the power transmission between the internal combustion engine and the countershaft is performed at a first gear reduction ratio,
The power transmission between the internal combustion engine and the countershaft is performed at a second gear reduction ratio smaller than the first gear reduction ratio when the second clutch is in a connected state. PTO system to do. A control device for controlling the PTO system
When starting transmission of power from the internal combustion engine to the PTO shaft,
With the dual clutch, the first clutch is connected and the second clutch is disconnected,
When the rotational acceleration of the countershaft is equal to or higher than a preset rotational acceleration, or when the rotational speed of the countershaft is equal to or higher than a first preset rotational speed, the dual 2. The PTO system according to claim 1, wherein the PTO system is configured to switch the first clutch to a disengaged state by a clutch and to switch the second clutch to a connected state. 3. A control device for controlling the PTO system
When transmitting the power from the internal combustion engine to the PTO shaft and operating the bodywork equipment,
When the required torque of the bodywork equipment is equal to or higher than a preset set torque, or when the rotational speed of the counter shaft is less than a preset second preset rotational speed, the first clutch In a connected state, disengage the second clutch, and transmit power to the PTO shaft at a first gear reduction ratio,
When the required torque of the bodywork equipment is less than the set torque or when the rotation speed of the countershaft is equal to or higher than the second set rotation speed, the first clutch is disengaged. 3. The PTO system according to claim 1, wherein the PTO system is configured to perform control for transmitting power to the PTO shaft at a second gear reduction ratio with the second clutch in a connected state. A part of the power of the internal combustion engine is transmitted to a transmission countershaft via a dual clutch having a first clutch and a second clutch, and is transmitted from the countershaft to a bodywork facility via a PTO shaft. In the system control method,
When the first clutch is in a connected state, power is transmitted between the internal combustion engine and the countershaft at a first gear reduction ratio, and when the second clutch is in a connected state, the first clutch A method for controlling a PTO system, wherein power transmission is performed between the internal combustion engine and the countershaft with a second gear reduction ratio smaller than a gear reduction ratio. When transmission of power from the internal combustion engine to the PTO shaft is started, the first clutch is brought into a connected state, the second clutch is brought into a disengaged state, the dual clutch is brought into a connected state, Performing power transmission between the internal combustion engine and the countershaft at a gear reduction ratio;
When the rotational acceleration of the countershaft is equal to or higher than a preset rotational acceleration, or when the rotational speed of the countershaft is equal to or higher than a first preset rotational speed, the dual The clutch is switched to the disengaged state and the second clutch is switched to the connected state, and the second gear reduction ratio is lower than the first gear reduction ratio between the internal combustion engine and the countershaft. 5. The method for controlling a PTO system according to claim 4, wherein power transmission is performed. When transmitting the power from the internal combustion engine to the PTO shaft and operating the bodywork equipment,
When the required torque of the bodywork equipment is equal to or higher than a preset set torque, or when the rotational speed of the counter shaft is less than a preset second preset rotational speed, the first clutch In a connected state, disengage the second clutch, and transmit power to the PTO shaft at a first gear reduction ratio,
When the required torque of the bodywork equipment is less than the set torque or when the rotation speed of the countershaft is equal to or higher than the second set rotation speed, the first clutch is disengaged. 6. The method of controlling a PTO system according to claim 4, wherein the second clutch is in a connected state, and power is transmitted to the PTO shaft at a second gear reduction ratio.

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