KR102056852B1 - Air conditioning system for automotive vehicles - Google Patents

Abstract

The present invention relates to an air stop device for an idle stop vehicle, and when configured to enter the "idle stop mode", the "idle stop mode" by being configured to quickly reduce the "refrigeration pressure deviation" between the outlet side and the inlet side of the compressor. It is intended to be able to quickly reduce the "driving load" of the electric motor to the compressor at the entry of.
In order to achieve the above object, the present invention includes a compressor, a condenser, an expansion valve and an evaporator, and in an idle stop vehicle air conditioner for driving the compressor with an electric motor while entering the idle stop mode when the vehicle is idle. Pressure deviation reducing means capable of reducing a pressure deviation between the outlet high pressure refrigerant and the inlet low pressure refrigerant of the fuel cell; When entering the idle stop mode, if the refrigerant pressure deviation between the outlet side and the inlet side of the compressor is greater than or equal to the preset reference pressure deviation, the pressure difference reducing means is controlled so that the refrigerant pressure deviation between the outlet side and the inlet side can be reduced. A control unit is provided.

Description

Air Conditioning System for Vehicles {AIR CONDITIONING SYSTEM FOR AUTOMOTIVE VEHICLES}

The present invention relates to an air stop device for an idle stop vehicle, and more particularly, by being configured to quickly reduce the "coolant pressure deviation" between the outlet side and the inlet side of the compressor when entering the "idle stop mode", A vehicle air conditioner that can quickly reduce the "drive load" of an electric motor to a compressor upon entering "idle stop mode".

Recently, various eco-friendly vehicles having high fuel economy and low emission of exhaust gas have been developed. An example is an Idle Stop & Go (ISG) vehicle.

An idle stop vehicle is a vehicle that prevents the engine from idling. When the vehicle stops due to a traffic signal or the like, the vehicle enters the "idle stop mode" and stops the engine. When the vehicle restarts, the idle stop mode is released. Restart the engine.

Since such an idle stop vehicle prevents the engine from idling, unnecessary fuel consumption can be reduced and exhaust gas emissions can also be reduced. Therefore, it increases fuel economy of the vehicle and reduces air pollution.

On the other hand, when the idle stop vehicle enters the "idle stop mode", as shown in Fig. 1, the engine 1 is stopped, so that the air conditioner may be stopped. Thus, upon entering the "idle stop mode", the compressor 5 of the air conditioning apparatus is configured to be driven by the electric motor 3 in place of the stopped engine 1.

This allows the air conditioner of the air conditioner to continue to operate even when the engine 1 is stopped at the time of entering the "idle stop mode". As a result, the vehicle interior can maintain a comfortable ecology despite the entry of the "child stop mode" (in FIG. 1, 7 is a condenser, 7a is a condenser cooling fan, 9 is an expansion valve, and 10 is an evaporator). .).

By the way, such a conventional idle stop vehicle has a large "pressure deviation" between the high pressure refrigerant of the outlet side Pd and the low pressure refrigerant of the inlet side Ps of the compressor 5 when the "idle stop mode" enters the compressor ( If the rated capacity of 5) is exceeded, there is a disadvantage that the "drive load" of the electric motor 3 to the compressor 5 becomes too large.

And because of this disadvantage, when entering the "child stop mode", there is a problem that the electric motor 3 can not drive the compressor 5, because of this problem, when entering the "idle stop mode", the air conditioner does not operate There is a drawback.

In particular, when the external load is high and the cooling load of the air conditioner is high, the "pressure deviation" between the outlet side Pd refrigerant and the inlet side Ps refrigerant of the compressor 5 becomes larger. In this case, 12 kPa There is a problem in that the electric motor 3 driven at the "rated voltage" cannot drive the compressor 5 exceeding the "rated capacity".

And because of this problem, there is a problem that the air conditioner does not operate when entering the "idle stop mode".

In particular, as shown in FIG. 2, after the entry of the "idle stop mode", the "pressure deviation" between the outlet side Pd refrigerant and the inlet side Ps refrigerant of the compressor 5 gradually decreases, and the "pressure The disadvantage is that the compressor 5 cannot be driven until the deviation is lower than the "reference pressure deviation" value corresponding to the "rated capacity" of the compressor 5.

Because of this problem, when the "idle stop mode" is entered, the air conditioner is operated until the refrigerant "pressure deviation" between the outlet side Pd and the inlet side Ps of the compressor 5 becomes lower than the "reference pressure deviation". There is a drawback of being delayed during this " Δt1 " time, and a problem has been pointed out that the comfort in the vehicle is significantly reduced due to this drawback.

The present invention has been made to solve the above-mentioned conventional problems, the object of which is to quickly reduce the "refrigerant pressure deviation" between the outlet side and the inlet side of the compressor when entering the "idle stop mode". The present invention provides a vehicle air conditioner capable of rapidly reducing the “drive load” of the electric motor to the compressor when entering the “idle stop mode”.

Another object of the present invention is to configure the power supply of the electric motor to the compressor to be reduced quickly when entering the "idle stop mode", so that when entering the "idle stop mode", It is to provide a vehicle air conditioner that can prevent the operation delay of the air conditioner due to the "drive load".

Another object of the present invention is configured to prevent the operation delay of the air conditioner due to the increase in the "drive load" of the electric motor at the time of entering the "idle stop mode", thereby entering the "idle stop mode" The present invention provides a vehicle air conditioner that can be driven quickly without delaying the air conditioner and, therefore, can improve the comfort in the vehicle cabin when entering the "idle stop mode".

In order to achieve this object, the vehicle air conditioner according to the present invention includes a compressor, a condenser, an expansion valve and an evaporator, and when the vehicle is idle, an idle stop for driving the compressor with an electric motor while entering the idle stop mode. An air conditioner for a vehicle, comprising: pressure deviation reducing means capable of reducing pressure variations between an outlet high pressure refrigerant and an inlet low pressure refrigerant of the compressor; At the time of entering the idle stop mode, when the refrigerant pressure deviation between the outlet side and the inlet side of the compressor is equal to or greater than a preset reference pressure deviation, the pressure deviation reducing means so that the refrigerant pressure deviation between the outlet side and the inlet side can be reduced. It characterized in that it comprises a control unit for controlling.

Preferably, the pressure deviation reducing means comprises: a condenser cooling fan capable of reducing the refrigerant pressure deviation between the inlet side by lowering the outlet refrigerant pressure of the compressor as the refrigerant on the condenser side is cooled; An expansion valve capable of reducing a pressure difference between an outlet refrigerant of the compressor acting on the inlet side and an inlet refrigerant of the compressor acting on the outlet side as the opening amount of the throttle passage increases; By directly communicating the inlet and outlet sides of the expansion valve, the pressure difference between the outlet refrigerant of the compressor and the inlet refrigerant, respectively, which act on the inlet and outlet sides of the expansion valve, can be reduced. A first communication passage for communicating the inlet side and the outlet side of the expansion valve, and a first opening / closing valve for opening and closing the first communication passage; By directly communicating the inlet side of the expansion valve and the inlet side of the compressor, it is possible to reduce the pressure deviation between the outlet refrigerant of the compressor and the compressor inlet refrigerant acting on the inlet side of the expansion valve, And a second opening passage for communicating the inlet side of the expansion valve and the inlet side of the compressor, and a second opening and closing valve for opening and closing the second communication passage.

When the idle stop mode is entered, the controller increases the rotational speed of the condenser cooling fan to a predetermined size while entering the first mode when the refrigerant pressure difference between the outlet and inlet sides of the compressor is equal to or greater than the reference pressure deviation. To; After entering the first mode, when the refrigerant pressure deviation between the outlet and inlet sides of the compressor does not decrease below a reference pressure deviation, the opening amount of the expansion valve is increased while entering the second mode; After entering the second mode, when the refrigerant pressure deviation between the outlet and the inlet sides of the compressor does not decrease below the reference pressure deviation, the first opening / closing valve may be opened to enter the third mode to open the first communication passage. To control; After entering the third mode, when the refrigerant pressure deviation between the outlet and the inlet sides of the compressor does not decrease below the reference pressure deviation, the second opening / closing valve may be opened to enter the fourth mode to open the second communication passage. It characterized in that to control.

According to the vehicle air conditioner according to the present invention, when the "idle stop mode" is entered, when the "refrigerant pressure deviation" between the outlet side and the inlet side of the compressor is higher than the reference value, the "refrigerant pressure deviation" is quickly and quickly. Since it is a structure for reducing, when entering the "idle stop mode", there is an effect that can quickly reduce the "drive load" of the electric motor to the compressor.

In addition, since the "drive load" of the electric motor to the compressor can be quickly reduced at the time of entering the "idle stop mode", the "drive load" of the electric motor at the time of entering the "idle stop mode". There is an effect that can prevent the operation delay caused by the air conditioner.

In addition, since the operation delay of the air conditioner can be prevented due to the increase of the "drive load" of the electric motor when entering the "idle stop mode", the entry of the "idle stop mode" can be quickly performed without delaying the air conditioner. It is possible to drive, and therefore, when entering the "child stop mode", there is an effect that can improve the comfort in the vehicle interior.

1 is a view showing a conventional vehicle air conditioner,
2 is a graph showing an operation example of a conventional vehicle air conditioner, a graph showing a refrigerant pressure deviation between the outlet side and the inlet side of the compressor when entering the idle stop mode, and the operating time of the compressor thereby;
3 is a view showing the configuration of a vehicle air conditioner according to the present invention;
4 and 5 is a flow chart showing an operation example of the vehicle air conditioner according to the present invention,
Fig. 6 is a graph showing an operation example of the vehicle air conditioner according to the present invention, which is a graph showing the refrigerant pressure deviation between the outlet side and the inlet side of the compressor when entering the idle stop mode, and the operating time of the compressor.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a vehicle air conditioner according to the present invention will be described in detail with reference to the accompanying drawings.

First, before looking at the vehicle air conditioner according to the present invention, a brief description of the air conditioner of the idle stop vehicle with reference to FIG.

The air conditioner of the idle stop vehicle includes a compressor 5, a condenser 7, an expansion valve 9, and an evaporator 10.

The compressor 5 compresses the vaporized refrigerant into a gas of high temperature and high pressure, and the condenser 7 liquefies the refrigerant of high temperature and high pressure.

Here, the compressor 5 is driven by the electric motor 3 when the vehicle enters the "idle stop mode" and is driven by the engine 1 when released from the "idle stop mode". .

After introducing the liquefied refrigerant, the expansion valve 9 is throttled into the throttle passage 9a to expand under reduced pressure with the low temperature and low pressure refrigerant.

Here, the expansion valve 9 is composed of an electronic expansion valve, it is configured so that the opening amount of the throttle passage (9a) is variable in proportion to the heat load of the evaporator (10). Therefore, the amount of decompression expansion of the refrigerant is actively controlled according to the heat load of the evaporator 10. As a result, the amount of refrigerant flowing into the evaporator 10 is actively changed according to the heat load of the evaporator 10.

The evaporator 10 injects the refrigerant of low temperature and low pressure expanded under reduced pressure, and then exchanges heat with surrounding air to generate cold air.

Next, the features of the vehicle air conditioner according to the present invention will be described in detail with reference to FIGS.

First, referring to FIG. 3, the air conditioner of the present invention includes an idle stop mode detecting means 20 for detecting whether the vehicle has entered an idle stop mode.

The idle stop mode detecting unit 20 is composed of a transmission sensor (not shown), and detects whether the transmission is stopped and outputs an "idle stop mode entry signal S1". Thus, the vehicle detects "entrance to the kids stop mode".

In addition, the air conditioner of the present invention includes a refrigerant pressure deviation detection means 30 for detecting a "coolant pressure deviation" between the outlet side Pd and the inlet side Ps of the compressor 5.

The refrigerant pressure deviation detecting means 30 detects an outlet side refrigerant pressure detecting sensor 32 for detecting a refrigerant pressure Pd of the outlet side Pd of the compressor 5, and a refrigerant pressure of an inlet side Ps of the compressor 5. An inlet refrigerant pressure sensor 34 and a microcomputer 36 for processing data inputted from these outlet / inlet refrigerant pressure sensors 32, 34.

In particular, the microcomputer 36 processes the data input from the outlet / inlet refrigerant pressure sensors 32 and 34 to “refrigerate pressure deviation” of the outlet Pd and the inlet Ps of the compressor 5. Calculate the value.

The air conditioner of the present invention is provided on the first communication passage 40 and the first communication passage 40 for communicating the inlet side 9b and the outlet side 9c of the expansion valve 9 with each other. A first opening and closing valve 42 is included.

The first communication passage 40 communicates the inlet side 9b and the outlet side 9c of the expansion valve 9 with each other, so that the high pressure refrigerant at the inlet side 9b of the expansion valve 9 enters the outlet side 9c. This allows direct bypassing.

Therefore, the "refrigerant pressure deviation" between the inlet side 9b and the outlet side 9c of the expansion valve 9 is reduced. Thus, the outlet Pd of the compressor 5 acting on the inlet side 9b of the expansion valve 9 and the inlet side of the compressor 5 acting on the outlet side 9c of the expansion valve 9. (Ps) makes it possible to reduce the "pressure deviation" between the refrigerants.

The first opening / closing valve 42 is a normally closed solenoid valve that normally closes the first communication passage 40, and opens the first communication passage 40 while being operated according to an applied control signal. .

Thus, the high pressure refrigerant at the inlet side 9b of the expansion valve 9 can be bypassed to the outlet side 9c. Thus, the outlet Pd of the compressor 5 acting on the inlet side 9b of the expansion valve 9 and the inlet side of the compressor 5 acting on the outlet side 9c of the expansion valve 9. (Ps) The "pressure deviation" between refrigerants is reduced. As a result, the "refrigerant pressure deviation" between the outlet side Pd high pressure refrigerant of the compressor 5 and the inlet side Ps low pressure refrigerant can be reduced.

The air conditioner of the present invention includes a second communication passage 50 and a second communication passage 50 for communicating the inlet side 9b of the expansion valve 9 and the inlet side Ps of the compressor 5 with each other. The second opening and closing valve 52 is installed on the).

The second communication passage 50 communicates the inlet side 9b of the expansion valve 9 and the inlet side Ps of the compressor 5 with each other so that the high pressure refrigerant of the inlet side 9b of the expansion valve 9 Allows direct bypass to the inlet side Ps of the compressor 5.

Therefore, the "refrigerant pressure deviation" between the inlet side 9b of the expansion valve 9 and the inlet side Ps of the compressor 5 is reduced. Thereby, the "pressure deviation" between the outlet side Pd refrigerant of the compressor 5 and the inlet side Ps refrigerant of the compressor 5 acting on the inlet side 9b of the expansion valve 9 is directly reduced. As a result, the "refrigerant pressure deviation" between the outlet side Pd high pressure refrigerant of the compressor 5 and the inlet side Ps low pressure refrigerant can be reduced.

The second opening / closing valve 52 is a normally closed solenoid valve that normally closes the second communication passage 50, and opens the second communication passage 50 while being operated in accordance with an applied control signal. .

Thus, the high pressure refrigerant at the inlet side 9b of the expansion valve 9 can be bypassed directly to the inlet side Ps of the compressor 5. Thereby, the "pressure deviation" between the outlet side Pd refrigerant of the compressor 5 and the inlet side Ps refrigerant of the compressor 5 acting on the inlet side 9b of the expansion valve 9 is directly reduced. As a result, the "refrigerant pressure deviation" between the outlet side Pd high pressure refrigerant of the compressor 5 and the inlet side Ps low pressure refrigerant can be reduced.

3, the air conditioner of this invention is equipped with the control part 60. As shown in FIG.

The controller 60 is equipped with a microprocessor, and when the "idle stop mode entry signal S1" is input from the idle stop mode detection means 20, the "refrigerant pressure" input from the refrigerant pressure deviation detection means 30. The deviation value is compared with the preset reference pressure deviation.

At this time, if the "refrigerant pressure deviation" input from the refrigerant pressure deviation detection means 30 is equal to or more than the "standard pressure deviation", the controller 60 is in a state in which the vehicle enters the "idle stop mode" and the compressor 5 It is determined that the "refrigerant pressure deviation" between the outlet side Pd and the inlet side Ps of the () is too large to drive the compressor 5 with the electric motor 3.

When the determination is made, the control unit 60 enters the "first mode 62", and the control unit 60 entering the "first mode 62" is the rotational speed of the condenser cooling fan 7a. To increase.

In particular, the rotational speed of the condenser cooling fan 7a is increased by a predetermined size. Therefore, the temperature of the refrigerant circulating along the inside of the condenser 7 is lowered. This allows the refrigerant pressure of the outlet side Pd of the compressor 5 to be lowered.

As a result, the "pressure deviation" between the outlet side Pd high pressure refrigerant of the compressor 5 and the inlet side Ps low pressure refrigerant can be reduced quickly. This allows the "drive load" of the electric motor 3 to the compressor 5 to be reduced. This enables the electric motor 3 to drive the compressor 5 without difficulty.

On the other hand, after increasing the rotational speed of the condenser cooling fan 7a, the controller 60 again checks whether the "refrigerant pressure deviation" input from the refrigerant pressure deviation detecting means 30 is lower than the "standard pressure deviation". Judge for comparison.

At this time, if the "refrigerant pressure deviation" of the refrigerant pressure deviation detection means 30 is not lowered below the "reference pressure deviation", the control unit 60 is still at the outlet side Pd and the inlet side of the compressor 5 ( It is determined that the "refrigerant pressure deviation" of Ps) is too large to drive the compressor 5 with the electric motor 3.

When the determination is made, the control unit 60 enters the "second mode 64" from the "first mode 62", and the control unit 60 entering the "second mode 64" The opening amount of the throttle passage 9a is increased by controlling the expansion valve 9.

In particular, the expansion valve 9 is controlled so that the opening amount of the throttle passage 9a becomes the maximum state. Therefore, the "refrigerant pressure deviation" between the inlet side 9b and the outlet side 9c of the expansion valve 9 is reduced.

Thus, the outlet Pd of the compressor 5 acting on the inlet side 9b of the expansion valve 9 and the inlet side of the compressor 5 acting on the outlet side 9c of the expansion valve 9. (Ps) Secondarily reduce the "pressure deviation" between the refrigerants.

As a result, the "refrigerant pressure deviation" between the outlet Pd high pressure refrigerant of the compressor 5 and the inlet Ps low pressure refrigerant can be reduced secondarily. This allows the "drive load" of the electric motor 3 to the compressor 5 to be reduced. This enables the electric motor 3 to drive the compressor 5 without difficulty.

On the other hand, the controller 60 controls the opening amount of the throttle passage 9a of the expansion valve 9, and then the "coolant pressure deviation" input from the refrigerant pressure deviation detection means 30 is less than the "standard pressure deviation". It is judged again whether or not it fell.

At this time, if the "refrigerant pressure deviation" of the refrigerant pressure deviation detection means 30 is still not lower than the "standard pressure deviation", the control unit 60 still has the outlet side Pd and the inlet side of the compressor 5. It is determined that the "refrigerant pressure deviation" of Ps is too large to drive the compressor 5 with the electric motor 3.

When the determination is made, the controller 60 enters the "third mode 66" from the "second mode 64", and the controller 60 entering the "third mode 66" The first opening and closing valve 42 is controlled to open the first communication passage 40.

Therefore, the high pressure refrigerant at the inlet side 9b of the expansion valve 9 and the low pressure refrigerant at the outlet side 9c can be directly communicated. Thus, the outlet Pd of the compressor 5 acting on the inlet side 9b of the expansion valve 9 and the inlet side of the compressor 5 acting on the outlet side 9c of the expansion valve 9. (Ps) It is possible to reduce the "pressure deviation" between the refrigerants.

As a result, the "refrigerant pressure deviation" between the outlet side Pd high pressure refrigerant of the compressor 5 and the inlet side Ps low pressure refrigerant can be reduced in three dimensions. This allows the "drive load" of the electric motor 3 to the compressor 5 to be reduced. This enables the electric motor 3 to drive the compressor 5 without difficulty.

On the other hand, the control unit 60 opens the first opening / closing valve 42, and then compares and again determines whether the “refrigerant pressure deviation” input from the refrigerant pressure deviation detecting means 30 is lower than the “standard pressure deviation”. do.

At this time, if the "refrigerant pressure deviation" of the refrigerant pressure deviation detection means 30 is not lowered below the "reference pressure deviation", the control unit 60 is still at the outlet side Pd and the inlet side of the compressor 5 ( It is determined that the "refrigerant pressure deviation" of Ps) is too large to drive the compressor 5 with the electric motor 3.

When the determination is made, the controller 60 enters the "fourth mode 68" from the "third mode 66", and the controller 60 entering the "fourth mode 68" The second opening and closing valve 52 is controlled to open the second communication passage 50.

Therefore, the high pressure refrigerant of the inlet side 9b of the expansion valve 9 and the low pressure refrigerant of the inlet side Ps of the compressor 5 can be directly communicated. Thereby, the "pressure deviation" between the outlet side Pd refrigerant of the compressor 5 and the inlet side Ps refrigerant of the compressor 5 acting on the inlet side 9b of the expansion valve 9 can be reduced. do.

As a result, the " refrigerant pressure deviation " between the outlet side Pd high pressure refrigerant of the compressor 5 and the inlet side Ps low pressure refrigerant can be reduced quaternarily. This allows the "drive load" of the electric motor 3 to the compressor 5 to be reduced. This enables the electric motor 3 to drive the compressor 5 without difficulty.

On the other hand, the control unit 60, when the vehicle enters the "first mode 62", the vehicle is released from the "idle stop mode", the "idle stop mode entry signal input from the idle stop mode detection means 20; (S1) "is erased, the rotation speed of the condenser cooling fan 7a is returned to the original state.

In addition, when the control unit 60 enters the "second mode 64" and the "idle stop mode entry signal S1" of the idle stop mode detecting means 20 is cleared, the condenser cooling fan 7a. Of the expansion valve 9, the opening amount of the throttle passage 9a of the expansion valve 9 is returned to the original state. Thus, the expansion valve 9 can be automatically controlled according to the heat load of the evaporator 10.

In addition, when the controller 60 enters the "third mode 66" and the "idle stop mode entry signal S1" of the idle stop mode detecting means 20 is erased, the condenser cooling fan 7a. And the opening amount of the throttle passage 9a of the expansion valve 9 are returned to the original state, and the first opening / closing valve 42 is returned to the original state.

In particular, the first communication passage 40 is shut off by returning the first opening / closing valve 42 to its original state. This prevents the refrigerant at the inlet side 9b of the expansion valve 9 from being directly bypassed to the outlet side 9c. As a result, the expansion valve 9 is normally operated to allow the refrigerant to expand under reduced pressure.

In addition, when the control unit 60 enters the "fourth mode 68" and the "idle stop mode entry signal S1" of the idle stop mode detecting means 20 is erased, the condenser cooling fan 7a. , The opening amount of the throttle passage 9a of the expansion valve 9 and the first opening / closing valve 42 are returned to the original state, and the second opening / closing valve 52 is returned to the original state. Let's do it.

In particular, the second communication passage 50 is shut off by returning the second opening / closing valve 52 to its original state. This prevents the refrigerant at the inlet side 9b of the expansion valve 9 from being directly bypassed to the inlet side Ps of the compressor 5. As a result, the "pressure deviation" increases between the outlet side Pd refrigerant and the inlet side Ps refrigerant of the compressor 5, thereby allowing a normal cooling operation to be made.

Next, an operation example of the present invention having such a configuration will be described with reference to FIGS. 3 to 5.

First, in the state in which the air conditioner is ON (S101), it is determined whether the vehicle has entered the "idle stop mode" state (S103).

As a result of the determination, when entering the "idle stop mode" state, the controller 60 determines that the "refrigerant pressure deviation" of the outlet side Pd and the inlet side Ps of the compressor 5 is equal to or greater than the preset reference pressure deviation. It determines the recognition (S105).

As a result of the determination, if it is equal to or more than the “standard pressure deviation”, the controller 60 determines that the electric motor 3 cannot drive the compressor 5 and enters the “first mode 62” (S107).

Then, the controller 60 entering the "first mode 62" increases the rotation speed of the condenser cooling fan 7a by a predetermined size (S109).

Then, while the temperature of the refrigerant circulating along the inside of the condenser 7 is lowered, the refrigerant pressure of the outlet side Pd of the compressor 5 is lowered. Thereby, the "refrigerant pressure deviation" between the outlet side Pd and the inlet side Ps of the compressor 5 is reduced (S110).

As a result, the " drive load " of the electric motor 3 with respect to the compressor 5 is reduced, whereby the electric motor 3 can drive the compressor 5 without difficulty.

On the other hand, the controller 60 increases the rotational speed of the condenser cooling fan 7a, and then the "refrigerant pressure deviation" between the outlet side Pd and the inlet side Ps of the compressor 5 is the "reference pressure deviation". It is determined again whether or not lower than (S111).

If the determination result is lower than the "standard pressure deviation", the control part 60 determines that the electric motor 3 drives the compressor 5 normally, and after a predetermined time elapses from the "first mode 62", While being released, the condenser cooling fan 7a returns to its original state at step S113. Then, the air conditioner operates while operating normally.

On the other hand, in step (S111), if the "refrigerant pressure deviation" of the outlet side Pd and the inlet side Ps of the compressor 5 does not fall below the "standard pressure deviation" (S111-1), the control unit ( 60 determines that the electric motor 3 cannot drive the compressor 5 and enters the "second mode 64" (S115).

Then, the controller 60 entering the "second mode 64" controls the expansion valve 9 to increase the opening amount of the throttle passage 9a (S117).

Then, the "refrigerant pressure deviation" between the outlet side Pd and the inlet side Ps of the compressor 5 is reduced while the "refrigerant pressure deviation" between the inlet side 9b and the outlet side 9c of the expansion valve 9 is reduced. Is reduced secondary (S118).

As a result, the " drive load " of the electric motor 3 with respect to the compressor 5 is reduced. Thereby, the electric motor 3 can drive the compressor 5 without difficulty.

On the other hand, the controller 60 increases the opening amount of the expansion valve 9, and then the "refrigerant pressure deviation" at the outlet side Pd and the inlet side Ps of the compressor 5 is less than the "standard pressure deviation". It is determined whether or not it is reduced again (S119).

If the determination result is lower than the "standard pressure deviation", the control unit 60 determines that the electric motor 3 normally drives the compressor 5, and then after the preset time elapses, the control unit 60 starts from the "second mode 64". While being released, the rotational speed of the condenser cooling fan 7a and the opening amount of the expansion valve 9 are returned to their original state (S121). Then, the air conditioner operates while operating normally.

On the other hand, in step S119, if the "refrigerant pressure deviation" of the outlet side Pd and the inlet side Ps of the compressor 5 is not lowered below the "reference pressure deviation" (S119-1), the control unit ( 60 determines that the electric motor 3 cannot drive the compressor 5 and enters the "third mode 66" (S123).

And the control part 60 which entered into the "third mode 66" opens the 1st opening / closing valve 42 (S125).

Then, the high-pressure refrigerant at the inlet side 9b of the expansion valve 9 is bypassed to the outlet side 9c and the "refrigerant pressure deviation" between the outlet side Pd and the outlet side Ps of the compressor 5 is the third. It is reduced to (S126).

As a result, the "drive load" of the electric motor 3 with respect to the compressor 5 is reduced, so that the electric motor 3 can drive the compressor 5 without difficulty.

On the other hand, the control part 60 opens the 1st opening / closing valve 42, and after that, the "refrigerant pressure deviation" of the outlet side Pd and the inlet side Ps of the compressor 5 is less than the "reference pressure deviation". It is determined again whether the degradation (S127).

If the determination result is lower than the "standard pressure deviation", the control unit 60 determines that the electric motor 3 normally drives the compressor 5, and then after the preset time elapses, the control unit 60 starts from the "third mode 66". While being released, the rotation speed of the condenser cooling fan 7a, the opening amount of the expansion valve 9, and the first opening / closing valve 42 are returned to their original state (S129). Then, the air conditioner operates while operating normally.

On the other hand, in step S127, if the "refrigerant pressure deviation" of the outlet side Pd and the inlet side Ps of the compressor 5 is not lowered below the "reference pressure deviation" (S127-1), the control unit ( 60 determines that the electric motor 3 cannot drive the compressor 5 and enters the "fourth mode 68" (S131).

And the control part 60 which entered into the "fourth mode 68" opens the 2nd opening / closing valve 52 (S133).

Then, the high-pressure refrigerant at the inlet side 9b of the expansion valve 9 is bypassed directly to the inlet side Ps of the compressor 5, and the " between the outlet side Pd and the outlet side Ps of the compressor 5 " The refrigerant pressure deviation "is reduced quaternarily (S135).

As a result, the "drive load" of the electric motor 3 with respect to the compressor 5 is reduced, so that the electric motor 3 can drive the compressor 5 without difficulty.

On the other hand, the control part 60 opens the 2nd opening / closing valve 52, and the "refrigerant pressure deviation" of the outlet side Pd and the inlet side Ps of the compressor 5 is less than the "reference pressure deviation". It is determined again whether the degradation (S137).

If the determination result is lower than the "standard pressure deviation", the control unit 60 determines that the electric motor 3 normally drives the compressor 5, and then after the preset time elapses, the control unit 60 starts from the "fourth mode 68". While being released, the rotational speed of the condenser cooling fan 7a, the opening amount of the expansion valve 9, the first open / close valve 42 and the second open / close valve 52 are returned to their original state (S139). Then, the air conditioner operates while operating normally.

According to the present invention having such a configuration, as shown in FIG. 6, at the time of entering the "idle stop mode", the "refrigerant pressure deviation" between the outlet side Pd and the inlet side Ps of the compressor 5 is reduced. If it is higher than the "standard pressure deviation", it is a structure that reduces the "refrigerant pressure deviation" within a quick time (Δt2), so that when the "idle stop mode" enters, the electric motor 3 with respect to the compressor 5 "Drive load" can be reduced quickly.

In addition, since the "drive load" of the electric motor to the compressor 5 can be quickly reduced at the time of entering the "idle stop mode", the operation delay of the air conditioner is entered at the time of entering the "idle stop mode". The time [Delta] t2 can be significantly shortened as compared with the prior art.

In addition, since the operation delay time [Delta] t2 of the air conditioner can be drastically shortened in the case of entering the "idle stop mode", the comfort in the vehicle is remarkably improved when entering the "idle stop mode". You can.

Although the preferred embodiments of the present invention have been described above by way of example, the scope of the present invention is not limited to these specific embodiments, and may be appropriately changed within the scope of the claims.

1: Engine 3: Electric Motor
5: compressor 7: condenser
7a: condenser cooling fan 9: expansion valve
9a: throttle flow path 9b: inlet side of expansion valve
9c: outlet side of expansion valve 10: evaporator
20: idle stop mode detection means 30: refrigerant pressure deviation detection means
40: first communication passage 42: first opening and closing valve (Valve)
50: second communication passage 52: second opening and closing valve (Valve)
60: control unit Pd: outlet side of the compressor
Ps: Inlet side of the compressor

Claims (4)

It comprises a compressor (5), a condenser (7), an expansion valve (9) and an evaporator (10), which drives the compressor (5) with the electric motor (3) while entering the idle stop mode when the vehicle is idle. In the air stop device for an idle stop vehicle,
Pressure deviation reducing means capable of reducing the pressure deviation between the high pressure refrigerant at the outlet side (Pd) and the low pressure refrigerant at the inlet side (Ps) of the compressor (5);
When entering the idle stop mode, when the refrigerant pressure deviation between the outlet side Pd and the inlet side Ps of the compressor 5 is equal to or more than the preset reference pressure deviation, the outlet side Pd and the inlet side Ps A control unit for controlling the pressure deviation reducing means so as to reduce the refrigerant pressure deviation between the air conditioner and shorten the operation delay of the air conditioner due to excessive refrigerant pressure deviation between the outlet side Pd and the inlet side Ps of the compressor 5 ( 60),
The pressure deviation reducing means,
By cooling the refrigerant on the condenser 7 side, the refrigerant pressure deviation between the inlet side Ps can be reduced by lowering the refrigerant pressure of the outlet side Pd of the compressor 5. and;
As the opening amount of the throttle passage 9a is increased, the refrigerant in the outlet side Pd of the compressor 5 acting on the inlet side 9b and the compressor 5 acting on the outlet side 9c are An expansion valve 9 capable of reducing pressure variations between the inlet side Ps refrigerant;
The compressor 5 acting on the inlet and outlet sides 9b and 9c of the expansion valve 9 by directly communicating the inlet side 9b and the outlet side 9c of the expansion valve 9. The first communication passage communicating the inlet side 9b and the outlet side 9c of the expansion valve 9 so as to reduce the pressure deviation between the outlet side Pd refrigerant and the inlet side Ps refrigerant 40 and a first open / close valve 42 for opening and closing the first communication passage 40;
The compressor 5 acting on the inlet side 9b of the expansion valve 9 by directly communicating the inlet side 9b of the expansion valve 9 with the inlet side Ps of the compressor 5. The inlet side 9b of the expansion valve 9 and the inlet of the compressor 5 so as to reduce the pressure deviation between the refrigerant Pd of the outlet side Ps and the refrigerant inlet Ps of the compressor 5. And a second opening and closing valve (52) for opening and closing the second communication passage (50) for communicating the side (Ps). delete The method of claim 1,
The control unit 60,
When entering the idle stop mode, if the refrigerant pressure deviation between the outlet and inlet sides Pd and Ps of the compressor 5 is equal to or greater than the reference pressure deviation, the rotational speed of the condenser cooling fan 7a is entered while entering the first mode. Increase to a preset size;
After entering the first mode, if the refrigerant pressure deviation between the outlet and inlet sides Pd and Ps of the compressor 5 does not fall below the reference pressure deviation, the second valve enters the second mode and the Increases the amount of opening;
After entering the second mode, when the refrigerant pressure deviation between the outlet and inlet sides Pd and Ps of the compressor 5 does not decrease below the reference pressure deviation, the first communication passage 40 enters the third mode. Control the first opening / closing valve (42) to be open;
After entering the third mode, when the refrigerant pressure deviation between the outlet and inlet sides Pd and Ps of the compressor 5 does not decrease below the reference pressure deviation, the second communication passage 50 enters the fourth mode. ) Controls the second opening and closing valve (52) so that it can be opened. The method of claim 3, wherein
The control unit 60,
After entering the first mode, when the refrigerant pressure deviation between the outlet and inlet sides Pd and Ps of the compressor 5 drops below a reference pressure deviation, the condenser cooling fan 7a is released in the first mode. ) Return the rotation speed to its original state,
After entering the second mode, when the refrigerant pressure deviation between the outlet and inlet sides Pd and Ps of the compressor 5 drops below a reference pressure deviation, the condenser cooling fan 7a is released in the second mode. Return the rotational speed of c) and the opening amount of the expansion valve 9 to their original state;
After entering the third mode, when the refrigerant pressure deviation between the outlet and inlet sides Pd and Ps of the compressor 5 drops below the reference pressure deviation, the condenser cooling fan 7a is released in the third mode. Return the original speed of the rotational speed of?), The opening amount of the expansion valve 9, and the first opening / closing valve 42;
After entering the fourth mode, when the refrigerant pressure deviation between the outlet and inlet sides Pd and Ps of the compressor 5 drops below the reference pressure deviation, the condenser cooling fan 7a is released in the fourth mode. And returning the rotation speed, the opening amount of the expansion valve (9), the first opening / closing valve (42) and the second opening / closing valve (52) to their original state.

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