JP2015030282A - Mechanism for power transmission of auxiliary machine and method for power transmission of auxiliary machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mechanism and method for power transmission of an auxiliary machine in which an output of an internal combustion engine is taken out when required by the auxiliary machine, and the auxiliary machine is driven by an optimal rotational speed with superior operating efficiency of the auxiliary machine, thereby contributing the improvement of fuel consumption of vehicles and contributing the decrease of restriction of a layout and space-saving.SOLUTION: A working fluid discharged from a fluid pump 12 connected to a crankshaft 11 of an internal combustion engine 10 through a power separating device 17 and driven by the power of the internal combustion engine 10 is made to flow into a fluid motor 14 connected to a rotating shaft 21 of the auxiliary machine 20 and driving the auxiliary machine 20, and the auxiliary machine 20 is driven by the power of the internal combustion engine 10. Also, the connection and separation of the power separating device 17 is controlled based on a rotational speed Ne of the internal combustion engine 10, and a return flow rate at the time when a portion of the working fluid discharged from the fluid pump 12 is returned to the fluid pump 12 without passing the fluid motor 14 is adjusted based on the rotational speed Ne of the internal combustion engine 10 or the rotational speed Na of the auxiliary machine 20.

Description

  The present invention relates to a power transmission mechanism for an auxiliary machine that can take out power from the crankshaft of an internal combustion engine when necessary, and drive the auxiliary machine at an optimum rotational speed with good operation efficiency in the auxiliary machine, and the power of the auxiliary machine It relates to the transmission method.

  In commercial vehicles such as trucks, driving of auxiliary equipment such as ACG (alternating current generator) of an internal combustion engine and water pump mounted on the vehicle is usually from the viewpoint of installation space in the vehicle and cost reduction. Therefore, the power generated in the internal combustion engine is used without providing a drive source dedicated to the auxiliary equipment. When a belt-type power transmission mechanism or a gear-type power transmission mechanism via gears is used for this power transmission, the power is transmitted to the auxiliary machine at a rotational speed proportional to the rotational speed of the internal combustion engine. And its output is obtained.

  For example, as shown in FIG. 6, a pulley 30 provided on a crankshaft 11X of an internal combustion engine (engine: ENG) 10X and a pulley 31 provided on a drive shaft 21X of an auxiliary machine (such as ACG) 20X are connected to a timing belt 32. And the power of the internal combustion engine 10X is transmitted to and driven by the auxiliary machine 20X using the belt type power transmission mechanism 1X of the auxiliary machine.

  However, in such a power transmission mechanism of an auxiliary machine, the rotation of the crankshaft of the internal combustion engine is transmitted directly and constantly to the auxiliary machine, so that the auxiliary power is compensated according to the rotational speed Ne of the internal combustion engine as shown in FIG. The machine speed Na and the output are determined. For this reason, the auxiliary machine is operated even in the rotation speed region where the operation efficiency is low (“unreachable region” and “overspeed region” in FIG. 7) in the auxiliary machine such as a rotary machine, and the rotation speed Ne of the internal combustion engine is In the small “not-reached region (Ne1 <Ne <Ne3)”, the output of the auxiliary machine does not reach the required amount and becomes insufficient, and conversely, the rotational speed Ne of the internal combustion engine is large “Overspeed region (Ne3 <Ne <Ne2). ) ”Has the problem that the output of the auxiliary machine exceeds the required amount and becomes excessive. In addition, when the rotation speed Na of the auxiliary machine is separated from the high-efficiency rotation speed Nab, there is a problem that the operation efficiency of the auxiliary machine is poor and the energy loss is increased.

  Even if there is no need to transmit power to the auxiliary machine in the operation region where the output of the auxiliary machine is unnecessary and the driving of the auxiliary machine is unnecessary (Ne ≦ Ne1 or Ne2 ≦ Ne), the belt type power transmission mechanism or Since the power is transmitted from the internal combustion engine to the auxiliary machine through the gear-type power transmission mechanism and the auxiliary machine is operated, and a part of the power of the internal combustion engine is wasted, the power used for traveling the vehicle In addition to the power required for driving the auxiliaries, the internal combustion engine consumes extra fuel. As a result, there has been a problem that the fuel consumption of the vehicle is deteriorated.

  Further, in the power transmission mechanism via the timing belt and the gear, since it is necessary to arrange an auxiliary machine around the internal combustion engine, there is a problem that a large restriction is imposed on a layout in a narrow engine room.

  In this connection, a hydraulic pump driven by an engine mounted on the vehicle, a variable capacity hydraulic motor driven by the hydraulic pressure generated by the hydraulic pump, and an AC generator rotated by the hydraulic motor, A low-speed rotation of the engine, comprising: an electronic control means for supplying a detection signal of a rotating body such as the engine, the hydraulic motor, or an AC generator, and controlling the capacity of the hydraulic motor and the excitation current of the AC generator Even in some cases, there has been proposed an AC generator for a vehicle that is driven and controlled at a constant rotational speed so that the AC generator generates electric power having a constant frequency (see, for example, Patent Document 1).

  However, in this vehicle AC generator, the rotational speed of the AC generator is maintained at a constant rotational speed by using a variable displacement hydraulic motor. However, it is necessary for driving the motive power and auxiliary equipment used for traveling the vehicle. The problem of deterioration of the fuel consumption of the vehicle due to consumption of the output of the internal combustion engine other than power cannot be solved.

Japanese Patent Laid-Open No. 03-169298

  The present invention has been made in view of the above, and an object of the present invention is to provide an output of the internal combustion engine when the auxiliary machine requires it in a power transmission mechanism of the auxiliary machine that drives the auxiliary machine with the output of the internal combustion engine. The auxiliary machine can be driven at an optimal speed with good driving efficiency of the auxiliary machine, contributing to improved fuel efficiency of the vehicle, and reducing layout constraints, contributing to space saving. It is an object to provide a power transmission mechanism for an auxiliary machine and a power transmission method for the auxiliary machine.

  To achieve the above object, a power transmission mechanism of an auxiliary machine according to the present invention is connected to a crankshaft of an internal combustion engine through a power disconnecting device, and is driven by a fluid pump driven by the power of the internal combustion engine. A fluid motor connected to the rotary shaft of the machine and driving the auxiliary machine; a fluid motor driving flow path for returning the working fluid discharged from the fluid pump to the fluid pump after passing through the fluid motor; A return flow path for returning the working fluid discharged from the fluid pump to the fluid pump without passing through the fluid motor; and a return flow rate for adjusting a flow rate of the fluid motor drive flow path and the return flow path An adjusting device configured to control connection and disconnection of the power disconnecting device based on the rotational speed of the internal combustion engine, and based on the rotational speed of the internal combustion engine or the rotational speed of the auxiliary machine Return flow rate Configured with a control device for controlling the integer unit.

  According to this configuration, since the connection and disconnection of the power disconnecting device are controlled based on the rotational speed of the internal combustion engine, the auxiliary equipment driven by the power of the internal combustion engine can be controlled according to the rotational speed of the internal combustion engine. If the operating efficiency of the machine is extremely bad or unnecessary, or from the viewpoint of safety, the power transmission to the auxiliary machine is cut off, and if the auxiliary machine is driven at a high operating efficiency, the power transmission to the auxiliary machine is performed. Only the driving force can be transmitted from the internal combustion engine. Accordingly, useless driving of the auxiliary machine can be eliminated, and the fuel injection amount of the internal combustion engine based on the useless driving of the auxiliary machine can be reduced, thereby improving the fuel consumption.

  Further, by controlling the return flow rate adjusting device based on the rotational speed of the internal combustion engine or the rotational speed of the auxiliary machine, the power from the internal combustion engine is larger than the power required for the auxiliary machine, or it is compensated with high operating efficiency. When the machine cannot be driven, the flow rate of the working fluid flowing to the fluid motor can be adjusted so that only power that can be operated with high operating efficiency can be transmitted, so that the auxiliary machine can be operated with high operating efficiency. On the other hand, the load of the fluid pump can be reduced by the amount of the return flow rate, so that the fuel injection amount of the internal combustion engine can be reduced and the fuel consumption can be improved.

  Furthermore, since the auxiliary machine is driven using the working fluid, there are fewer layout restrictions compared to the belt-type power transmission mechanism and gear-type power transmission mechanism, and the placement of the auxiliary machine in the engine room is free. Since the degree increases, the space for arranging the internal combustion engine and the auxiliary machine can be reduced, which can contribute to space saving.

  In the power transmission mechanism of the above-mentioned auxiliary machine, when the rotational speed of the internal combustion engine is equal to or lower than the first rotational speed of the first internal combustion engine, or when the rotational speed of the internal combustion engine is greater than the first rotational speed of the first internal combustion engine, 2 When the engine speed is equal to or higher than the internal combustion engine speed, the power disconnecting device is controlled to be disconnected, and the internal combustion engine speed is greater than the first internal combustion engine speed and the second internal combustion engine speed is increased. If the power disconnecting device is controlled to be in the connected state when the number is less than the number, the driving of the auxiliary machine is unnecessary, or the rotational speed of the internal combustion engine or the rotational speed of the auxiliary machine is inappropriate for driving the auxiliary machine. When the engine speed is low or high, power transmission to the auxiliary machine can be cut off, reducing the energy loss of the internal combustion engine based on unnecessary driving of the auxiliary machine and improving fuel efficiency. Can do.

  Further, in the power transmission mechanism of the auxiliary machine, when the rotational speed of the internal combustion engine is higher than a preset third internal combustion engine speed, or when the rotational speed of the auxiliary machine is higher than a preset high efficiency rotational speed. If the control flow is adjusted so that the return flow rate adjustment device adjusts the return flow rate so that the rotation speed of the auxiliary machine maintains the high-efficiency rotation rate, power is extracted from the crankshaft of the internal combustion engine. When it is necessary to drive the auxiliary machine, and the rotational speed of the internal combustion engine is within a range suitable for driving the auxiliary machine, the auxiliary machine can be controlled to rotate at a high efficiency, and the auxiliary machine can be operated at high speed. Drive with efficiency. Therefore, the energy loss in driving the auxiliary machine can be reduced, and the fuel consumption of the internal combustion engine can be improved.

  This high-efficiency rotational speed is the rotational speed of the auxiliary machine that can be operated in a state in which the auxiliary machine has the highest efficiency, and can be set from the relationship between the rotational speed and the efficiency of the auxiliary machine specification. The third internal combustion engine rotational speed is the internal combustion engine speed at which the rotational speed of the rotating device is a preset high efficiency rotational speed when the return flow rate is set to a predetermined flow rate (for example, zero) by the return flow rate adjusting device. Set as number of revolutions.

  In addition, in order to achieve the above object, the power transmission method of the auxiliary machine according to the present invention is a discharge from a fluid pump connected to a crankshaft of an internal combustion engine via a power disconnecting device and driven by the power of the internal combustion engine. The actuated working fluid is flowed to a fluid motor that is connected to a rotating shaft of an auxiliary machine and drives the auxiliary machine, and the auxiliary machine is driven by the power of the internal combustion engine, and the power disconnecting device is connected and disconnected. Is controlled based on the rotational speed of the internal combustion engine, and a return flow rate when returning a part of the working fluid discharged from the fluid pump to the fluid pump without passing through the fluid motor is And adjusting based on the number or the rotational speed of the auxiliary machine.

  Further, in the power transmission method for an auxiliary machine, when the rotation speed of the internal combustion engine is equal to or lower than a first rotation speed of the first internal combustion engine, or a second internal combustion engine set in advance larger than the rotation speed of the first internal combustion engine. When the rotational speed is equal to or higher than the rotational speed of the internal combustion engine is set to a disconnected state, and the rotational speed of the internal combustion engine is greater than the first internal combustion engine speed and less than the second internal combustion engine speed, The power disconnecting device is connected.

  Further, in the power transmission method for an auxiliary machine, when the rotational speed of the internal combustion engine is higher than a preset third internal combustion engine speed, or the auxiliary machine has a preset rotational speed higher than a preset high efficiency rotational speed. Is higher, the return flow rate is adjusted so that the rotational speed of the auxiliary machine maintains the high-efficiency rotational speed.

  According to these methods, the same effects as those of the corresponding power transmission mechanism of the auxiliary machine can be obtained.

  According to the auxiliary power transmission mechanism and auxiliary power transmission method of the present invention, the power transmission to the auxiliary machine is cut off and connected according to the rotational speed of the internal combustion engine, and the auxiliary machine requires it. By extracting the output of the internal combustion engine and transmitting the power from the internal combustion engine by the amount of power that the auxiliary machine drives with high operating efficiency, unnecessary driving of the auxiliary machine can be eliminated and the operation of the auxiliary machine can be eliminated. Since the auxiliary machine can be driven at an optimal number of revolutions with high efficiency, it can contribute to the improvement of the fuel consumption of the vehicle, and the layout constraints can be reduced, thereby contributing to space saving.

It is a figure which shows typically the structure of the power transmission mechanism of the auxiliary machine of embodiment which concerns on this invention. It is a figure which shows the flow path for fluid motor drive which passes a fluid motor in FIG. It is a figure which shows the return flow path which does not pass a fluid motor in FIG. It is a figure which shows the preliminary | backup channel in FIG. It is a figure which shows the relationship between an engine speed and the rotation speed of a rotation apparatus in the power transmission mechanism of the auxiliary machine of embodiment which concerns on this invention. It is a figure which shows an example of the belt type power transmission mechanism of the auxiliary machine of a prior art. It is a figure for demonstrating the problem in the belt type power transmission mechanism of the auxiliary machine of a prior art.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an auxiliary machine power transmission mechanism and an auxiliary machine power transmission method according to embodiments of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, an auxiliary power transmission mechanism 1 that transmits the power of an internal combustion engine (ENG) 10 to a rotating device (auxiliary machine: ACG) 20 is connected to a crankshaft 11 of the internal combustion engine 10 with a power disconnecting device ( Rotation of an auxiliary machine 20 composed of a hydraulic pump (fluid pump: P) 12 connected via a clutch (C) 17 and driven by the power of the internal combustion engine 10 and a rotating device such as an ACG or a water pump A hydraulic motor (fluid motor: M) 14 that is connected to the shaft 21 via a flange 22 and drives the auxiliary machine 20 and a reserve tank (T) 15 are configured.

  Further, a hydraulic motor driving flow path (fluid motor driving flow path) A (shown in FIG. 5) returns the working fluid discharged from the hydraulic pump 12 to the hydraulic pump 12 through the reserve tank 15 after passing through the hydraulic motor 14. 2), a return flow path B (see FIG. 3) for returning the working fluid discharged from the hydraulic pump 12 to the hydraulic pump 12 via the reserve tank 15 without passing through the hydraulic motor 14, and driving of the hydraulic motor And a return flow rate adjusting device (V) 13 for adjusting the flow rate of the flow path A and the return flow path B.

  Further, preferably, as a backup channel when the return flow rate adjusting device 13 fails, a reserve channel C (FIG. 4) that connects the hydraulic pump 12 and the hydraulic motor 14 without the return flow rate adjusting device 13 interposed therebetween. And a three-way valve 16 that closes the preliminary flow path C during normal operation and opens the preliminary flow path C only when the return flow rate adjusting device 13 breaks down.

  By providing the preliminary flow path C and the three-way valve 16, even when the return flow rate adjusting device 13 breaks down, the working fluid discharged from the hydraulic pump 12 by operating the three-way valve 16 is passed through the return flow rate adjusting device 13. Since the power of the internal combustion engine 10 can be transmitted to the auxiliary machine 20 without being transmitted to the hydraulic motor 14, the auxiliary machine 20 can be operated although the operating efficiency is lowered. Thereby, it is possible to avoid the auxiliary machine 20 from being stopped due to a failure of the return flow rate adjusting device 13.

  In this embodiment, the working oil is used as the working fluid. However, the working fluid may be an incompressible fluid, such as lubricating oil for the internal combustion engine 10, hydraulic oil for the hydraulic device, cooling water for the internal combustion engine 10, or the like. Can be used. In addition, by providing the reserve tank 15, it is possible to easily collect the hydraulic oil in each of the flow paths A, B, and C at the time of maintenance inspection or when the return flow rate adjusting device 13 breaks down. Can be improved. Although the auxiliary machine 20 and the hydraulic motor 14 are connected via the flange 22, it is only necessary that the power of the hydraulic motor 14 can be transmitted to the auxiliary machine 20, and it is not always necessary to connect the flange 22.

  As shown in FIG. 1, a control device 40a for operating and controlling the hydraulic pump 12, the return flow rate adjusting device 13, the hydraulic motor 14, the three-way valve 16, the power disconnecting device 17, and the like is provided. The control device 40a is normally configured to be incorporated in an overall system control device 40 that performs overall control of the internal combustion engine 10 and overall control of a vehicle in which the internal combustion engine 10 is mounted.

  The control device 40a controls the disconnection of the power disconnection device 17 based on the rotational speed Ne of the internal combustion engine 10, and controls the connection of the power disconnection device 17 based on the rotational speed Ne of the internal combustion engine 10.

  That is, as shown in FIG. 5, when the rotational speed Ne of the internal combustion engine 10 is equal to or lower than the first internal combustion engine speed Ne1 set in advance (Ne ≦ Ne1), or set higher than the first internal combustion engine speed Ne1. When the second internal combustion engine speed Ne2 is greater than or equal to Ne2 (Ne2 ≦ Ne), the power disconnecting device 17 is disconnected and the power of the internal combustion engine 10 is not transmitted to the auxiliary machine 20 so that the rotational speed Na of the auxiliary machine 20 Is zero.

  Furthermore, when the rotational speed Ne of the internal combustion engine 10 is greater than the first internal combustion engine speed Ne1 and less than the second internal combustion engine speed Ne2 (Ne1 <Ne <Ne2), the power disconnecting device 17 is brought into the connected state. Configured to perform control.

  At the same time, the control device 40a is configured to control the return flow rate adjusting device 13 based on the rotational speed Ne of the internal combustion engine 10 or the rotational speed Na of the auxiliary machine. That is, when the rotational speed Ne of the internal combustion engine 10 is higher than the preset third internal combustion engine rotational speed Ne3, or when the rotational speed Na of the auxiliary machine 20 is higher than the preset high-efficiency rotational speed Nab, The return flow rate adjusting device 13 is configured to control the return flow rate of the working fluid so that the rotation rate Na of the auxiliary machine 20 maintains the high-efficiency rotation rate Nab.

  The control of the return flow rate is performed, for example, by previously setting a numerical value for control of the return flow rate adjustment device 13 based on the rotational speed Ne of the internal combustion engine 10 as map data or the like, and referring to this map data. It is done by controlling.

  Alternatively, the return flow rate is controlled by monitoring the rotation speed Na of the auxiliary machine 20 with a rotation speed sensor (not shown) or the like and adjusting the return flow volume when the rotation speed Na of the auxiliary machine 20 exceeds the high efficiency rotation speed Nab. When the opening degree of the adjustment valve of the device 13 is slightly opened from the current state to increase the return flow rate, and the rotational speed Na of the auxiliary machine 20 becomes smaller than the high efficiency rotational speed Nab, the valve of the adjustment valve of the return flow rate adjustment device 13 This is performed by feedback control that the opening degree is slightly closed from the current state and the return flow rate is reduced.

  The high-efficiency rotational speed Nab is the rotational speed of the auxiliary machine 20 that can be operated in a state where the auxiliary machine 20 has the highest efficiency, and can be set from the relationship between the rotational speed and the efficiency of the specifications of the auxiliary machine 20. Further, the third internal combustion engine rotational speed Ne3 is a high-efficiency rotational speed Nab preset by the rotational speed Na of the auxiliary machine 20 when the return flow rate adjusting device 13 sets the return flow rate to a preset flow rate (for example, zero). Is set as the rotational speed of the internal combustion engine 10.

  That is, when the rotational speed Ne of the internal combustion engine 10 exceeds the third internal combustion engine rotational speed Ne3, when the return flow rate is kept at a preset flow rate (for example, zero) by the return flow rate adjustment device 13, The rotational speed Na of the auxiliary machine 20 driven by the hydraulic motor 14 rises, for example, along the rotational speed characteristic line Lx as shown in FIG. 5 and exceeds the high-efficiency rotational speed Nab in the over-rotation region. It will be driven by Na, and the auxiliary machine (rotating device) 20 will drive | operate by the rotation speed Na with a bad operating efficiency.

  On the other hand, in the present invention, when the rotational speed Ne of the internal combustion engine 10 exceeds the third internal combustion engine rotational speed Ne3, the return flow rate adjusting device 13 adjusts the return flow rate to set a flow rate (for example, 5), the flow rate of the working fluid flowing to the hydraulic motor 14 is decreased, and the rotational speed Na of the auxiliary machine 20 driven by the hydraulic motor 14 is set to a rotational speed characteristic line as shown in FIG. (Bold line) Control is performed so as to maintain the high-efficiency rotational speed Nab along La. As a result, the auxiliary machine (rotating device) 20 can avoid entering the over-rotation region and operates at a high-efficiency rotational speed Nab with good operating efficiency.

  Depending on the capacity of the hydraulic pump 12 and the capacity of the hydraulic motor 14, as shown in FIG. 5, a portion corresponding to the “unreachable region” of the prior art occurs. Even if the rotational speed Ne of 10, that is, the rotational speed of the hydraulic pump 12 is small, the rotational speed of the hydraulic motor 14, that is, the rotational speed Na of the auxiliary machine (rotating device) 20 is increased. The number characteristic line (thick line) La1 can be changed to a long broken line La2, a short broken line La3, a thin line La4, etc., and a portion corresponding to the “unreachable region” can be reduced.

  In the auxiliary power transmission method using the auxiliary power transmission mechanism 1, the hydraulic pressure is connected to the crankshaft 11 of the internal combustion engine 10 via the power disconnection device 17 and driven by the power of the internal combustion engine 10. The working fluid discharged from the pump 12 is supplied to the hydraulic motor 14 that is connected to the rotating shaft 21 of the auxiliary machine 20 and drives the auxiliary machine 20, and the auxiliary machine 20 is driven by the power of the internal combustion engine 10. At the same time, the connection and disconnection of the power disconnecting device 17 is controlled based on the rotational speed Ne of the internal combustion engine 10, and a part of the working fluid discharged from the hydraulic pump 12 is hydraulically passed without passing through the hydraulic motor 14. The return flow rate when returning to the pump 12 is adjusted based on the rotational speed Ne of the internal combustion engine 10 or the rotational speed Na of the auxiliary machine 20.

  Further, when the rotational speed Ne of the internal combustion engine 10 is equal to or smaller than the first internal combustion engine rotational speed Ne1, or when the rotational speed Ne is equal to or larger than the second internal combustion engine rotational speed Ne2 that is larger than the first internal combustion engine rotational speed Ne1, When the power disconnecting device 17 is in the disconnected state and the rotational speed Ne of the internal combustion engine 10 is greater than the first internal combustion engine rotational speed Ne1 and less than the second internal combustion engine rotational speed Ne2, the power disconnecting device 17 is Connected.

  Furthermore, when the rotational speed Ne of the internal combustion engine 10 is higher than the preset third internal combustion engine speed Ne3, or when the rotational speed Na of the auxiliary machine 20 is higher than the preset high-efficiency rotational speed Nab. The return flow rate adjustment device 13 adjusts the return flow rate so that the rotation rate Na of the auxiliary machine 20 maintains the high efficiency rotation rate Nab.

  According to the auxiliary power transmission mechanism 1 and the auxiliary power transmission method, the connection and disconnection of the power disconnecting device 17 are controlled based on the rotational speed Ne of the internal combustion engine 10. In the driven auxiliary machine (rotating equipment) 20, the transmission of power to the auxiliary machine 20 is interrupted when the operating efficiency of the auxiliary machine 20 is poor according to the rotational speed Ne of the internal combustion engine 10 or the rotational speed Na of the auxiliary machine. In addition, when the auxiliary machine 20 is driven with high efficiency according to the rotational speed Ne of the internal combustion engine 10, power is transmitted to the auxiliary machine 20 and only the driving force is transmitted from the internal combustion engine 10. Can do. Therefore, useless driving of the auxiliary machine 20 can be eliminated, and the fuel injection amount in the internal combustion engine 10 based on the useless driving of the auxiliary machine 20 can be reduced to improve fuel consumption.

  Further, by controlling the return flow rate adjusting device 13 based on the rotational speed Ne of the internal combustion engine 10 or the rotational speed Na of the auxiliary machine 20, the power from the internal combustion engine 10 is larger than the power required for the auxiliary machine 20, or When the auxiliary machine 20 cannot be driven with high operating efficiency, the amount of working fluid to the hydraulic motor (fluid motor) 14 is set so that the auxiliary machine 20 transmits only necessary power that can be operated with high operating efficiency. Since it can be adjusted, the auxiliary machine 20 can be operated with high operation efficiency. On the other hand, since the load of the hydraulic pump (fluid pump) 12 can be reduced by the return flow rate, the fuel injection amount of the internal combustion engine 10 can be reduced to improve the fuel consumption.

  Further, since the auxiliary machine 20 is driven using the working fluid, layout restrictions are reduced as compared with the belt type power transmission mechanism and the gear type power transmission mechanism, and the arrangement of the auxiliary machine 20 in the engine room is reduced. Therefore, the space in which the internal combustion engine 10 and the auxiliary machine 20 are arranged can be reduced, which can contribute to space saving.

  Further, when the rotational speed Ne of the internal combustion engine 10 is a low rotational speed (Ne <Ne1) or high rotational speed (Ne2 <Ne) inappropriate for driving the auxiliary machine 20, the power transmission to the auxiliary machine 20 is cut off. Therefore, energy loss of the internal combustion engine 10 based on useless driving of the auxiliary machine 20 can be reduced, and fuel consumption can be improved.

  Further, even when the rotational speed Ne of the internal combustion engine 10 is in a region suitable for driving the auxiliary machine 20, the auxiliary machine 20 can be controlled to rotate at the high-efficiency rotational speed Nab. It can be driven with. Therefore, the energy loss in driving the auxiliary machine 20 can be reduced, so that the fuel consumption of the internal combustion engine 10 can be improved.

  Therefore, according to the auxiliary power transmission mechanism and auxiliary power transmission method of the present invention, the power transmission to the auxiliary machine 20 is cut off and connected in accordance with the rotational speed Ne of the internal combustion engine 10, and the auxiliary machine 20 The output of the internal combustion engine 10 is taken out when necessary, and power is transmitted from the internal combustion engine 10 by the amount of power that the auxiliary machine 20 drives with high operating efficiency, thereby eliminating unnecessary driving of the auxiliary machine 20. In addition, since the auxiliary machine 20 can be driven at the optimum rotational speed Nab with good operating efficiency of the auxiliary machine 20, it can contribute to the improvement of the fuel consumption of the vehicle, and the layout constraint can be reduced. It can contribute to space saving.

1, 1X Auxiliary power transmission mechanism 10, 10X Internal combustion engine
11 Crankshaft 12 Hydraulic pump (fluid pump)
13 Return flow adjusting device 14 Hydraulic motor (fluid motor)
15 Reserve tank 16 Three-way valve 17 Power disconnection device (clutch)
20, 20X Auxiliary machine (Rotating equipment: ACG)
21 Rotating shaft 40a Control device 40 Overall system control device A Hydraulic motor drive flow path B Return flow path C Preliminary flow path La, La1, La2, La3, La4, Lx Auxiliary machine speed characteristic line Na Auxiliary machine speed High efficiency rotation speed of Nab auxiliary machine Na1 First auxiliary machine rotation speed Na2 Second auxiliary machine rotation speed Ne Internal combustion engine speed Ne1 First internal combustion engine speed Ne2 Second internal combustion engine speed Ne3 Third internal combustion engine speed

Claims (6)

A fluid pump connected to the crankshaft of the internal combustion engine via a power disconnecting device and driven by the power of the internal combustion engine; a fluid motor connected to the rotary shaft of the auxiliary machine and driving the auxiliary machine; The working fluid discharged from the fluid pump is passed through the fluid motor and then returned to the fluid pump, and the working fluid discharged from the fluid pump is passed through the fluid motor. Without a return flow path returning to the fluid pump, and a flow rate adjustment device for adjusting the flow rate of the fluid motor driving flow path and the return flow path,
A control device for controlling connection and disconnection of the power disconnecting device based on the rotational speed of the internal combustion engine and for controlling the return flow rate adjusting device based on the rotational speed of the internal combustion engine or the rotational speed of the auxiliary machine A power transmission mechanism for an auxiliary machine, comprising: The control device is
When the rotational speed of the internal combustion engine is less than or equal to a preset first internal combustion engine speed, or when the rotational speed is greater than or equal to a preset second internal combustion engine speed greater than the first internal combustion engine speed, And control to turn off
The power disconnecting device is controlled to be connected when the rotational speed of the internal combustion engine is larger than the first internal combustion engine rotational speed and less than the second internal combustion engine rotational speed. Item 2. A power transmission mechanism for an auxiliary machine according to Item 1. The control device is
When the rotational speed of the internal combustion engine is higher than a preset third internal combustion engine speed, or when the rotational speed of the auxiliary machine is higher than a preset high-efficiency rotational speed, the rotational speed of the auxiliary machine The power transmission mechanism for an auxiliary machine according to claim 1 or 2, wherein control for adjusting the return flow rate is performed by the return flow rate adjustment device so that the high-efficiency rotational speed is maintained. A working fluid discharged from a fluid pump connected to a crankshaft of the internal combustion engine via a power disconnecting device and driven by the power of the internal combustion engine is connected to a rotation shaft of the auxiliary machine to drive the auxiliary machine. Flowing through a fluid motor, driving the auxiliary machine with the power of the internal combustion engine,
Controlling the connection and disconnection of the power disconnection device based on the rotational speed of the internal combustion engine;
A return flow rate when returning a part of the working fluid discharged from the fluid pump to the fluid pump without passing through the fluid motor is adjusted based on the rotational speed of the internal combustion engine or the rotational speed of the auxiliary machine. A power transmission method for an auxiliary machine. When the rotational speed of the internal combustion engine is less than or equal to a preset first internal combustion engine speed, or when the rotational speed is greater than or equal to a preset second internal combustion engine speed greater than the first internal combustion engine speed, In a disconnected state,
5. The power disconnecting device is brought into a connected state when the rotational speed of the internal combustion engine is larger than the first internal combustion engine rotational speed and less than the second internal combustion engine rotational speed. The power transmission method of the described auxiliary machine.   When the rotational speed of the internal combustion engine is higher than a preset third internal combustion engine speed, or when the rotational speed of the auxiliary machine is higher than a preset high-efficiency rotational speed, the rotational speed of the auxiliary machine 6. The auxiliary power transmission method according to claim 4 or 5, wherein the return flow rate is adjusted so as to maintain the high-efficiency rotational speed.

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