KR20090062320A - Air conditioner driving system of hybrid electric vehicle - Google Patents

Abstract

An air conditioner driving apparatus of a hybrid vehicle is provided to normally operate an air conditioner by counterrotating power of an ISG(Integrated Starter and Generator) without having a loading action of an engine when power between the ISG and the engine is cut by a one-way clutch. An air conditioner driving apparatus of a hybrid vehicle transmits external rotational power to a compressor driving shaft(31) to operate an air conditioner. An engine crank shaft and the compressor driving shaft are connected through a belt such that power is transmitted. A rotation axis(21) of an ISG(20) and the compressor driving shaft are connected through a pulley and a belt such that power is transmitted. A one-way clutch pulley which transmits only one-way rotational power is attached to the engine crank shaft or the rotation axis of the ISG. A solenoid valve for reversely changing a refrigerant incoming and outgoing direction is installed at a refrigerant inlet of a compressor(30). The ISG is reversely rotated when the engine is off. The compressor driving shaft is reversely rotated by the backlashing driving power of the ISG to operate the air conditioner when the torque between the rotation axis of the ISG and the engine crank shaft is cut by the one-way clutch pulley and the solenoid valve reversely changes the refrigerant incoming and outgoing direction.

Description

Air conditioner driving system of hybrid electric vehicle

The present invention relates to an air conditioner driving apparatus of a hybrid vehicle, and more particularly, an air conditioner of a hybrid vehicle capable of operating the air conditioner by driving the air conditioner compressor using the rotational force of the ISG even in the engine off state (EV mode, etc.) of the hybrid vehicle. It relates to a drive device.

In general, a hybrid vehicle in a broad sense means to drive a vehicle by efficiently combining two or more different power sources, but in most cases, an engine (internal combustion engine) that obtains rotational force by burning fuel (fossil fuel such as gasoline). It means a vehicle driven by an electric motor that obtains rotational power by the power of the battery, and this is called a hybrid electric vehicle (HEV).

In response to the recent demand for improving fuel economy and developing more environmentally friendly products, research on hybrid vehicles is being actively conducted.

As is well known, in a hybrid vehicle, an electric vehicle (EV) mode, which is a pure electric vehicle mode for driving a vehicle using only the rotational force of an electric motor (driving motor), an engine mode using only the rotational force of an engine, and rotational forces of an engine and an electric motor It is possible to select and switch the hybrid electric vehicle (HEV) mode used at the same time.

As such, in the hybrid vehicle, the mechanical energy of the engine and the electric energy of the battery can be used together, and thus the energy can be efficiently used. Especially, the fuel efficiency of the vehicle can be improved by using the optimum operating area of the engine and the electric motor. At the same time, since the energy is recovered by the electric motor, there is an advantage that the efficient energy can be used.

On the other hand, in order to drive the air conditioner in the above-described hybrid vehicle as well as a general vehicle equipped only with a gasoline or diesel engine, the air conditioner compressor, which is a refrigerant compressor, needs to receive power from the engine.

That is, the air conditioner compressor is driven by receiving the power of the engine, and the refrigerant is compressed and circulated, thereby operating the air conditioner to lower the vehicle indoor temperature.

In general, an air conditioner compressor is driven by a compressor drive shaft receiving power from a pulley and a belt from an engine crankshaft.

However, since the EV mode of the hybrid vehicle drives only the electric motor alone, when the EV mode is driven, the air conditioner compressor is not powered by the engine off, which causes a problem that the air conditioner cannot be operated.

Therefore, the present invention is invented to solve the above problems, to provide an air conditioner driving apparatus of a hybrid vehicle capable of operating the air conditioner by operating the air conditioner compressor even in the engine off state (EV mode, etc.) of the hybrid vehicle. There is this.

In order to achieve the above object, the present invention, in the air conditioner driving apparatus of a hybrid vehicle for transmitting the external rotational force to the compressor drive shaft to operate the air conditioner,

The engine crankshaft and the compressor drive shaft are connected to enable transmission of power through the belt, and the rotation shaft of the ISG serving as a starting motor and generator for starting the engine and the compressor drive shaft are connected to the belt between the pulley and the pulley so as to transmit power.

One-way clutch pulley is installed on the engine crankshaft or ISG rotation shaft to transmit only one-way torque between the shaft and the pulley, and a solenoid valve is installed at the compressor inlet and outlet to reverse the refrigerant inlet.

As the ISG is reversely rotated when the engine is turned off, the pulley and the belt are rotated with the one-way clutch pulley disconnected from the ISG rotational shaft and the engine crankshaft, and the refrigerant inflow direction is reversed by the solenoid valve. By the reverse rotation drive force of the ISG transmitted through, the compressor drive shaft is characterized in that configured to be made to operate the air conditioner while the reverse rotation.

In a preferred embodiment, the engine crankshaft is provided with a one-way clutch pulley capable of transmitting forward rotational force only, and between the one-way clutch pulley of the engine crankshaft, the ISG pulley of the ISG rotation shaft, and the compressor pulley of the compressor drive shaft. It is characterized in that the belt is configured to be connected.

Also in a preferred embodiment, the one-way clutch pulley capable of only forward rotational force is installed on the ISG rotation shaft, the engine crankshaft pulley and the one-way clutch pulley of the ISG rotation shaft are connected by a belt, and the ISG pulley on the ISG rotation shaft. And a separate belt is connected between the compressor pulley of the compressor drive shaft.

In a preferred embodiment, the ISG rotation shaft is provided with a first one-way clutch pulley capable of transmitting only forward rotational force, and a second one-way clutch pulley capable of transmitting only reverse rotational force is further installed on the compressor drive shaft. A belt is connected between the crankshaft pulley, the first one-way clutch pulley of the ISG rotary shaft, and the compressor pulley of the compressor drive shaft, and is separate between the ISG pulley of the ISG rotary shaft and the second one-way clutch pulley of the compressor drive shaft. The belt is characterized in that the configuration is connected.

According to the air conditioner driving device of the hybrid vehicle of the present invention as described above, there is an effect that can operate the air conditioner by driving the air conditioner compressor even in the engine off state (EV mode, etc.) of the hybrid vehicle.

In particular, in the present invention, the air conditioner can be normally operated by the reverse rotational power of the ISG without the load action by the engine in a state where the power between the ISG and the engine is disconnected by the one-way clutch.

In particular, in the present invention, by installing a solenoid valve to reverse the flow direction of the refrigerant in the air conditioner compressor, the air conditioner can operate normally even in the reverse rotation driving state of the ISG and the air conditioner compressor.

In addition, the use of a one-way clutch is advantageous in terms of component cost and system applicability (complexity) compared to the existing electronic clutch system.

In addition, the amount of change of new additional system and existing components is small, and the air conditioner can be operated without load of the crankshaft and water pump, thereby improving the efficiency and performance of the air conditioner.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is to solve the problem that the air conditioner is not driven because it is not driven in the EV mode of the hybrid vehicle, that is, the electric motor is driven alone in the engine off state, a one-way that can only transmit the rotational force in one direction By using the clutch, the air conditioning compressor can be driven even when the engine is turned off by the power of the ISG.

1 is an overall configuration diagram of an air conditioner driving apparatus according to an exemplary embodiment of the present invention (same as the embodiment of FIG. 5), which is a plan view from an upper side of the engine, and FIG. As a side view, this is a view from the engine side.

As shown in FIG. 1, an integrated starter & generator (ISG) 20 serving as a starting motor and a generator for starting an engine is connected to the engine 10 so as to transmit power, and the pulley of the ISG (one- The way clutch pulley) 23 and the engine crankshaft pulley 12b are directly connected to the belt 64 for power transmission, so that the ISG rotation shaft 21, the ISG pulley 23, the crankshaft pulley 12b, and the crank shaft 11 is made to rotate together.

Accordingly, the ISG 20 rotates to rotate the crankshaft 11 through the belt 64, and the engine 10 is started in the state in which the crankshaft 11 is rotated by the ISG 20. You lose.

In addition, the air conditioner compressor 30 and the ISG 20 are connected to the belt 62a for power transmission, so that the air conditioner compressor 30 is driven by receiving the rotational force of the ISG 20 when the ISG 20 rotates. have.

However, in the present invention, the air conditioning compressor 30 is rotated by transmitting the rotational force of the ISG by driving the ISG 20 even in the engine off state. Therefore, if only the ISG 20 is driven, the ISG is the engine 10. The load by the crankshaft 11 of ().

That is, in order to drive the air conditioner compressor 30, there is a problem in that the ISG 20 needs to rotate together with the engine 10 as at the start.

Therefore, in order to drive the air conditioner compressor by driving the ISG in the engine off state, the rotational force of the ISG is prevented from being transmitted to the crankshaft of the engine so as not to be loaded by the crankshaft of the engine during the driving of the ISG. Shut off power transmission between the crankshafts of the engine.

Of course, when the ISG is driven to start the engine, the rotational force of the ISG must be transmitted to the crankshaft of the engine.

In addition, since the air conditioner must be driven by the power of the engine while the engine is basically driven, the air conditioner compressor must be rotated by transmitting the driving force of the engine through the crankshaft and the belt.

In view of this, in the present invention, a pulley (hereinafter referred to as a one-way clutch pulley) 23 employing a one-way clutch is used, and the one-way clutch is one-way between the pulley and the other pulley. It is configured to transmit the rotational force in the forward direction but block the rotational force in the opposite direction.

The one-way clutch is widely applied as an element capable of only one-way rotation in a gear of a planetary gear set. In the present invention, the one-way clutch is applied to a pulley, and the industrial configuration of the one-way clutch is widely used industrially. Since it is a known technology applied, only the state at the time of the pulley application will be described.

The one-way clutch includes an outer body 5 forming a pulley on which a belt is wound, and an inner body 2 integral with a pulley shaft (rotary shaft or drive shaft) 1, as shown in FIG. And a clutch body 3 interposed between the outer body 5 and the inner body 2 so that only one direction of rotational force is transmitted between the two bodies on both sides, and the clutch body 3 is a ball bearing. It is shaped like this.

Referring to the accompanying FIG. 4, the operating state will be described. As shown in (A), when the outer body 5 rotates in the forward direction, the ball embedded in the clutch body 3 (reference numeral 4 in FIG. 3) is used. The friction force is generated and the rotational force of the outer body (5) to be transmitted to the belt is transmitted to the inner body (2), such that the whole one-way clutch pulley rotates as if it were a normal pulley.

As a result, the rotational force of the belt is transmitted to the pulley shaft 1 through the one-way clutch pulley, ie, the outer body 5, the clutch body 3, and the inner body 2, which are integrally rotated, and by the rotational force of the belt The pulley shaft 1 can be rotated.

Conversely, when the pulley shaft 1 rotates in the forward direction, the rotational force of the inner body 2 integral with the pulley shaft 1 may be transmitted to the outer body 5 by the frictional force of the clutch body 3. Therefore, the forward rotational force of the pulley shaft 1 can be transmitted to the other pulley through the belt.

In the reverse rotation of the pulley shaft 1, the rotational force of the inner body 2 is not transmitted to the outer body 5, so even if the pulley shaft 1 is driven in the reverse direction, transmission of the rotational force to the other pulley through the belt does not occur. The bar, the pulley and its shaft do not act as a load.

On the other hand, as shown in (B), when the outer body 5 rotates in the reverse direction, power transmission does not occur between the bodies, and the inner body 2 does not rotate due to the bearing action of the clutch body 3.

That is, the clutch body 3 serves as a ball bearing, so that the rotational force of the outer body 5 transmitted to the belt is not transmitted to the inner body 2 so that only the outer body 5 rotates.

On the contrary, of course, also in the reverse rotation of the pulley shaft 1, as mentioned above, the rotational force of the inner body 2 integrally with the pulley shaft 1 by the ball bearing action of the clutch body 3. Since it is not transmitted to the outer body 5 and the pulley shaft 1 is powered off with the belt by the one-way clutch pulley, even if the pulley shaft 1 is driven in the reverse direction, transmission of rotational force to the other pulley through the belt does not occur. In other words, the other pulley and the shaft connected to the belt during the reverse driving of the pulley shaft does not act as a load.

If the one-way clutch pulley as described above is properly utilized as a pulley for driving the air conditioner as in the present invention, the air conditioner compressor can be driven by the engine when the engine is driven, and in the engine off state, the ISG is the crankshaft of the engine. It is possible to smoothly run the air conditioner compressor without being subjected to the load (eliminating unnecessary power transmission to the engine).

However, as will be described later, as the one-way clutch pulley is used, the rotation direction of the ISG rotation shaft for starting the engine and the rotation direction of the ISG rotation shaft for driving the air conditioner compressor are reversed when viewed on the basis of the ISG. .

In other words, to drive the air conditioner compressor, the ISG is driven in reverse rotation as opposed to starting.

In addition, when the air conditioner compressor is used as a reference, the air conditioner compressor rotation direction when driven by the rotational force of the engine and the air conditioner compressor rotation direction when driven by the rotational force of the ISG are reversed.

That is, when driven by the ISG, the air conditioner compressor rotates in the opposite direction as when driven by the engine.

This is because the air conditioner compressor can be rotated in both directions. When the air conditioner compressor 30 reversely rotates as opposed to when driven by the engine 10 by the ISG 20, the refrigerant can be compressed, but the Since the flow direction is reverse, this is solved by mounting a solenoid valve 34 for controlling the refrigerant flow direction on the refrigerant inlet (33a, 33b) side of the air conditioner compressor 30 in the present invention.

The functions and actions of the one-way clutch pulley and solenoid valve described above can be summarized as follows.

-One-way clutch pulley

→ ISG power can be transmitted to the crankshaft of the engine when the engine is started (start mode), and engine power can be transferred to the air conditioner compressor when the engine is running (HEV operation mode). The air conditioner compressor can be used to prevent unnecessary ISG power transmission to the engine when the ISG is rotated in the opposite direction of the engine rotation (engine crankshaft rotation at engine start-up and drive) (blocking the engine crankshaft from acting as a load). Ensure ISG power transfer.

Solenoid valve (installed on the refrigerant inlet side of the air conditioner compressor)

→ When operating the air conditioner compressor using the power of the ISG in the EV operation mode, the refrigerant flow path of the air conditioner compressor is reversed, so that the normal refrigerant compression and circulation even when the air conditioner compressor rotates in reverse direction (the normal refrigerant line of the air conditioner system). Circulation) and allow the air conditioner to operate normally.

As described above, the present invention drives the air conditioner compressor by driving the ISG in reverse rotation in the EV mode in which the engine is turned off by using the characteristic of the one-way clutch that transmits power in a constant rotational direction.

In addition, various embodiments of the present invention may be implemented according to the installation position of the one-way clutch pulley as described above, which will be described with reference to FIGS. 5 to 7.

First, Figure 5 is a view showing a first embodiment according to the present invention, showing an embodiment in which the one-way clutch pulley 13 is installed on the engine crankshaft 11, the engine crankshaft pulley 12 ) Is connected to the water pump pulley 41 and the belt 63 to drive the water pump 40, and the one-way clutch pulley 13 of the engine crankshaft 11 is the ISG pulley 22 and the air conditioner. The compressor pulley 32 and the belt 62 are connected.

Reference numeral 51 denotes a tensioner for maintaining the tension of the belt 62.

In this configuration, one belt 62 and one one-way clutch pulley 13 between the engine 10, the ISG 20, and the air conditioner compressor 30 are used, respectively, and the ISG pulley 22 and the air conditioner are used. As the compressor pulley 32, an ordinary belt connection pulley is used.

At start-up of the engine 10, the ISG 20 is driven to rotate in the forward direction, so that the forward rotational force of the ISG rotation shaft 21 and the pulley 22 passes through the belt 62 to the one-way clutch pulley of the engine crankshaft 11. And the one-way clutch pulley 13 and the crankshaft 11 are integrally rotated forward to enable engine starting.

In addition, when the engine 10 is driven (HEV operation mode), the engine crankshaft 11 is rotated in the forward direction, and the inner body of the one-way clutch pulley 13 is integrally rotated in this direction, whereby the clutch body The outer body rotates integrally forward due to friction (the clutch is in a bonded state), so that the rotational force of the engine crankshaft 11 can be transmitted to the belt 62.

As a result, while the rotational force of the engine 10 is transmitted to the ISG pulley 22 and the air conditioner compressor pulley 32 through the belt 62, the ISG 20 and the air conditioner compressor 30 are driven by the rotational force of the engine 10. It can be driven, thereby enabling the power generation and air conditioning operation of the ISG (20).

The water pump 40 is driven by receiving the rotational force of the engine 10 separately through the crankshaft pulley 12 connected to the belt 63.

In addition, when the ISG 20 is driven in the reverse direction to operate the air conditioner in the off state (EV driving mode) of the engine 10, the reverse rotational force of the ISG 20 is transmitted to the air conditioner compressor 30 through the belt 62. The air conditioner compressor 30 is reversely driven by the power of the ISG 20 to operate the air conditioner.

At this time, the reverse rotational force of the ISG 20 is transmitted to the one-way clutch pulley 13 through the belt 62, but the clutch body when the reverse rotational force of the ISG 20 acts on the outer body of the one-way clutch. Since it is not transmitted to the inner body by the bearing action of (power disconnection), the ISG 20 is not loaded by the crankshaft 11 connected to the inner body of the one-way clutch.

Next, Figure 6 shows a second embodiment according to the present invention, showing an embodiment in which the one-way clutch pulley 23 is installed on the ISG rotation shaft 21.

As shown, the engine crankshaft first pulley 12a is connected to the water pump pulley 41 and the belt 63 to drive the water pump 40, and the one-way clutch of the ISG rotation shaft 21 The pulley 23 is connected to the engine crankshaft second pulley 12b with a separate belt 64, and the ISG pulley 22 is connected with the air conditioner compressor pulley 32 and another belt 62a.

In this configuration, two belts 62a, 64 are used between the engine 10, the ISG 20, and the air conditioner compressor 30, and one one-way clutch pulley 23 is used.

Although the number of belts is one more than that of the first embodiment of FIG. 5, the first embodiment requires a large one-way clutch pulley for driving the air conditioner compressor in the HEV mode, while in the second embodiment, a small specification is required. Since the one-way clutch pulley can be used, there is a cost reduction effect compared to the first embodiment and the third embodiment to be described later.

As the engine crankshaft first pulley 12a, the second pulley 12b, the ISG pulley 22, and the air conditioner compressor pulley 32, a conventional belt connection pulley is used.

At start-up of the engine 10, the ISG 20 is driven to rotate in the forward direction, and the forward rotational force of the ISG rotation shaft 21 and the pulley 23 is transmitted through the belt 64 to the second pulley 12b of the engine crankshaft 11. ), And the engine crankshaft second pulley 12b and the crankshaft 11 are integrally rotated in the forward direction so that the engine can be started.

In addition, when the engine 10 is driven (HEV operation mode), the engine crankshaft 11, the first pulley 12a and the second pulley 12b rotate in the forward direction, and the second pulley 12b and the belt 64 are rotated. One-way clutch pulley 23 is rotated in the forward direction.

At this time, when the forward rotation force is applied to the outer body of the one-way clutch by the belt 64, the inner body is integrally rotated forward (in the clutch joint state) due to the friction of the clutch body, thereby integrated with the inner body The ISG rotation shaft 21 is rotated in the forward direction so that the ISG 20 can drive power generation by the rotational force of the engine 10.

In addition, the forward rotational force of the ISG rotation shaft 21 is transmitted to the air conditioner compressor pulley 32 through the ISG pulley 22 and the belt 62a, and thus the air conditioner compressor 30 may be driven by the rotational force of the engine 10. The air conditioner can be operated.

The water pump 40 is driven while the water pump pulley 41 is rotated by the rotational force of the engine 10 through the first pulley 12a and the belt 63.

In addition, when the ISG 20 is driven in the reverse direction to operate the air conditioner in the off state of the engine 10 (EV mode), the reverse rotational force of the ISG 20 is controlled by the ISG pulley 22 and the belt 62a connected thereto. The air conditioner compressor 30 is delivered to the compressor pulley 32, and the air conditioner 30 is driven in reverse rotation by the power of the ISG 20.

At this time, the reverse rotational force of the ISG 20 is transferred to the belt 64 of the engine crankshaft second pulley 12b by the one-way clutch pulley 23 (the clutch body of the one-way clutch acts as a bearing). It is not transmitted (disconnected power between the ISG and the engine), whereby the ISG 20 is not loaded by the engine crankshaft 11.

Next, Figure 7 shows a third embodiment according to the present invention, showing an embodiment in which the one-way clutch pulleys (23, 32a) is installed on the ISG rotary shaft 21 and the air conditioner compressor drive shaft (31). Giving.

As shown, the engine crankshaft first pulley 12a is connected to the water pump pulley 41 and the belt 63 to drive the water pump 40, and the first circle of the ISG rotary shaft 21- The way clutch pulley 23 is connected to the engine crankshaft second pulley 12b and the air conditioner compressor pulley 32 by a separate belt 62, and the ISG pulley 22 is the second member of the air conditioner compressor drive shaft 31. The way clutch pulley 32a and another belt 66 are connected.

In this configuration, two belts 62, 66 are used between the engine 10, the ISG 20, and the air conditioner compressor 30, and two one-way clutch pulleys 23, 32a are also used.

However, the first one-way clutch pulley 23 of the ISG rotation shaft 21 is capable of transmitting power with respect to the forward rotational force, but the one-way clutch pulley having a structure in which power is disconnected with respect to the reverse rotational force as in the above-described embodiment. The second one-way clutch pulley 32a of the air conditioner compressor drive shaft 31 is used to transmit power against the reverse rotational force, but the power is cut off against the forward rotational force, as opposed to the first one-way clutch pulley 23. One-way clutch pulleys of construction are used.

To this end, the first one-way clutch pulley 23 and the second one-way clutch pulley 32a have the same configuration and operation principle, but in the case of the second one-way clutch pulley, When the ball in the clutch body generates friction, the outer body and the inner body rotate together (possible to transmit power), and for the forward rotational force, the clutch body acts as a ball bearing, so that power transmission between the outer body and the inner body is prevented. Configured to be blocked.

The engine crankshaft 1st pulley 12a, the 2nd pulley 12b, the ISG pulley 22, and the air conditioner compressor pulley 32 use the normal pulley for belt connection.

When the engine is started, the ISG 20 is driven to rotate in the forward direction, and the forward rotational force of the ISG rotation shaft 21 is transmitted to the engine crankshaft second pulley 12b through the first one-way clutch pulley 23 and the belt 62. And the engine crankshaft second pulley 12b and the crankshaft 11 are integrally rotated in the forward direction so that the engine can be started.

In addition, when the engine 10 is driven (HEV operation mode), the engine crankshaft 11, the first pulley 12a and the second pulley 12b rotate in the forward direction, and the second pulley 12b and the belt 62 are rotated. ) Rotates the first one-way clutch pulley 23 of the ISG rotary shaft 21 in the forward direction.

At this time, the first one-way clutch pulley 23 is rotated forward by the belt 62 (the clutch is in a bonded state), and the ISG rotation shaft 21 rotates in the forward direction so that the ISG 20 of the engine 10 is rotated. Power generation drive can be performed by the rotational force.

In addition, the air conditioner compressor drive shaft 31 is rotated in the forward direction by the forward rotational force transmitted from the crankshaft second pulley 12b to the air conditioner compressor pulley 32 by the belt 62. Air conditioner compressor 30 may be driven, it is possible to operate the air conditioner.

The water pump 40 is driven while the water pump pulley 41 is rotated by the rotational force of the engine 10 through the first pulley 12a and the belt 63.

In addition, when the ISG 20 is driven in the reverse direction to operate the air conditioner in the off state (EV mode) of the engine 10, the reverse rotational force of the ISG 20 is controlled by the ISG pulley 22 and the belt 66 connected thereto. The second one-way clutch pulley 32a of the compressor drive shaft 31 is transferred to the air conditioner 30 while the air conditioner compressor 30 is driven in reverse rotation by the power of the ISG 20.

At this time, the reverse rotational force of the ISG 20 is the belt 62 of the engine crankshaft second pulley 12b by the first one-way clutch pulley 23 (the clutch body of the one-way clutch acts as a bearing). The furnace is not transmitted (disconnected power between the ISG and the engine), whereby the ISG 20 is not loaded by the engine crankshaft 11.

8 is a diagram illustrating a pulley driving direction of an ISG and an air conditioner compressor and an operating state of a solenoid valve due to the rotational force of the engine in the HEV mode. In FIG. 20 shows the rotational direction of the one-way clutch pulley 23 and the air conditioner compressor pulley 32 by arrows.

9 is a view showing a driving state of the air conditioner compressor and an operating state of the solenoid valve 34 in the EV mode.

First, when the engine is driven (HEV operation mode), the engine power is transmitted to the air conditioner compressor by the one-way clutch of the ISG to operate the air conditioner while driving the vehicle. The rotational direction of the -way clutch pulley 23 and the air conditioner compressor pulley 32 is the same as the rotational direction of the engine crankshaft pulley (second pulley) 12b as indicated by the arrow.

At this time, the inlet and outlet states of the refrigerant in and out according to the flow path state and the refrigerant flow direction in the solenoid valve 34 installed on the refrigerant inlet and outlet 33a and 33b side of the air conditioner compressor, and the flow path state of the solenoid valve 34 are the same as before. (See the lower figure in FIG. 8).

In addition, in the EV mode in which the engine is turned off, the ISG and the air conditioner compressor are rotated in the opposite direction by the inverter (35 in FIG. 1), and the air conditioner is operated.

When the air conditioner is operated by the reverse rotation power of the ISG, the air conditioner compressor is in the reverse rotation state. Therefore, the direction of the refrigerant inlet flow path should be reversed in the air conditioner compressor so that the refrigerant is not compressed and circulated backward in the entire refrigerant line of the air conditioner system. Only then will the air conditioner operate normally.

To this end, the solenoid valve 34 provided on the refrigerant inlet and outlet 33a, 33b side of the air conditioner compressor is switched to change the direction of the internal refrigerant inlet flow path as shown in FIG.

FIG. 10 is a flowchart illustrating a method for driving an air conditioner of a hybrid vehicle according to the present invention. Referring to FIG. 10, first, the ECU determines whether the air conditioner switch is on or off, and if the air conditioner switch is on, turns on / off the engine. It will be judged.

At this time, if the engine is in the on state, as the above-described HEV mode, the flow path in the solenoid valve is set to the normal refrigerant inflow direction in the ISG off state, and in this state, the compressor is driven by the rotational force of the engine as described above. Start the air conditioner.

On the other hand, if the engine is in the off state, as the above-described EV mode, the ISG is driven to rotate in the reverse direction, and at this time, the solenoid valve is switched to operate so that the flow path of the refrigerant is reversed so that the flow path in the valve is opposite to that of the normal engine driving. In this state, as described above, the compressor is driven by the rotational force of the ISG to operate the air conditioner.

In this way, in the present invention, when the air conditioner is operated when the engine is turned off, the compressor refrigerant inlet and outward direction is changed so that the solenoid valve 34 provided at the refrigerant inlet and outlet 33a, 33b of the air conditioner compressor 30 is opposite to that of the engine driving. At this time, the ISG 20 is driven in reverse rotation to drive the air conditioner compressor 30 so that the load by the engine 10 in a state where the power between the ISG 20 and the engine 10 is disconnected by the one-way clutch. Without action, it is possible to operate the air conditioner normally by the reverse rotational power of the ISG 20.

In particular, in the present invention, the solenoid valve 34 for changing the refrigerant flow direction in the air conditioner compressor 30 is installed in reverse, so that the refrigerant can be circulated normally along the refrigerant line of the air conditioner system even in the reverse rotation driving state of the air conditioner compressor. The air conditioner can be operated normally.

1 is an overall configuration diagram of an air conditioner driving apparatus according to an embodiment of the present invention;

2 is a side view of the air conditioner driving device shown in FIG. 1;

3 and 4 is a view for explaining the configuration and operating state of the one-way clutch in the present invention,

5 to 7 is a configuration diagram showing various embodiments of the present invention,

8 is a view showing the operation direction of the ISG and the compressor and the solenoid valve in the HEV mode in the present invention,

9 is a view showing the driving state of the compressor and the operating state of the solenoid valve in the EV mode in the present invention,

10 is a flowchart illustrating a method of driving an air conditioner of a hybrid vehicle according to the present invention.

<Explanation of symbols for the main parts of the drawings>

10: engine 20: ISG

30: air conditioner compressor 13, 23, 32a: one-way clutch pulley

Claims (4)

In the air conditioner driving device of the hybrid vehicle for transmitting the external rotational force to the compressor drive shaft 31 to operate the air conditioner, The engine crankshaft 11 and the compressor drive shaft 31 are connected to enable power transmission through the belt, and the rotary shaft 21 and the compressor drive shaft 31 of the ISG 20 serving as a starting motor and a generator for starting the engine. ) Is connected to the belt between the pulley and the pulley to allow power transmission. A one-way clutch pulley capable of only transmitting one-way rotational force between the shaft and the pulley is installed on the engine crankshaft 11 or the ISG rotation shaft 21, and the refrigerant inflow direction 33a, 33b of the compressor 30 is reversed. Solenoid valve 34 to switch to the installation is installed, As the ISG 20 is reversely rotated when the engine is turned off, the rotational force between the ISG rotation shaft 21 and the engine crankshaft 11 is cut off by the one-way clutch pulley, and the refrigerant flows in and out by the solenoid valve 34. In the reversed state, the compressor driving shaft 31 is reversely rotated by the reverse rotation driving force of the ISG 20 transmitted through the pulley and the belt, and the air conditioner driving for the hybrid vehicle is configured to be operated. Device. The method according to claim 1, The engine crankshaft 11 is provided with a one-way clutch pulley 13 capable of transmitting only a forward rotational force, and the one-way clutch pulley 13 of the engine crankshaft 11 and the ISG rotation shaft 21 A belt 62 is connected between the ISG pulley (22) and the compressor pulley (32) of the compressor drive shaft (31). The method according to claim 1, The one-way clutch pulley 23 capable of transmitting only forward rotational force is installed on the ISG rotation shaft 21, and the engine crankshaft pulley 12b and the one-way clutch pulley 23 of the ISG rotation shaft 21 are belts. And a separate belt 62a is connected between the ISG pulley 22 of the ISG rotary shaft 21 and the compressor pulley 32 of the compressor drive shaft 31. Device. The method according to claim 1, The first one-way clutch pulley 23 capable of transmitting forward rotational force only to the ISG rotation shaft 21 is installed, and the second one-way clutch pulley 32a capable of transmitting only reverse rotational force to the compressor drive shaft 31 is provided. A belt 62 is further installed between the engine crankshaft pulley 12b, the first one-way clutch pulley 23 of the ISG rotation shaft 21, and the compressor pulley 32 of the compressor drive shaft 31. Is connected, and a separate belt 66 is connected between the ISG pulley 22 of the ISG rotary shaft 21 and the second one-way clutch pulley 32a of the compressor drive shaft 31. Automotive air conditioning drive.

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