JP2003042073A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for a vehicle which prevents lubricating oil and refrigerants from being retained in either one of compressors even without providing a selector valve and a check valve to thereby increase the durable service life and the cooling performance of a compressor or an electric compressor. SOLUTION: The air conditioner for a vehicle is provided with the electric compressor 200 disposed in parallel to the compressor 111 and having a compressor part 220 that compresses the refrigerant through the driving of a motor 210, and a control device 130 controlling the operation of the electric compressor 200, wherein the electric compressor 200 is operated by the control device 130 when an engine 10 is stopped during the operation of the air conditioner 110. The electric compressor 200 is controlled so as to operate for a specified time T1 also when the compressor 111 is operated by the engine 10. Alternatively, the compressor 111 may serves as a variable displacement compressor 111a which controls displacement volume in the operation so as to be larger.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioner for a so-called idle stop vehicle in which the engine is stopped when the vehicle is temporarily stopped during traveling.

[0002]

2. Description of the Related Art Recently, there is an example in which a so-called idle stop vehicle is put on the market from the viewpoint of fuel saving. In this vehicle, since the engine is stopped when the vehicle is temporarily stopped during traveling, the compressor for the cooling device that operates by receiving the driving force of the engine is stopped together while the engine is stopped. Will not work as.

As a solution to this problem, for example, Japanese Patent Laid-Open No. 2000-
In Japanese Patent No. 127753, an electric compressor driven by a motor is provided so as to be arranged in parallel with the compressor,
When the engine is stopped, the cooling device is operated by this electric compressor so that the cooling function is achieved regardless of whether the engine is operated or stopped.

Further, here, the compressor and the electric compressor are operated alternately, so that the durability life of the compressor and the cooling performance are deteriorated due to the retention of the lubricating oil and the refrigerant on one of the compressor sides. To prevent this, a refrigerant flow direction switching valve and a check valve are provided in the pipe.

[0005]

However, by providing the switching valve and the check valve, the cooling device becomes complicated and the cost is increased.

In view of the above problems, an object of the present invention is to prevent a lubricating oil or a refrigerant from staying on one of the compressor sides without providing a switching valve or a check valve, and to suppress the compressor or the electric compressor. An object of the present invention is to provide a vehicle air-conditioning device that improves the durability life and air-conditioning performance of the vehicle.

[0007]

The present invention employs the following technical means in order to achieve the above object.

According to the first aspect of the invention, the invention is applied to a vehicle in which the engine (10) is stopped when the vehicle is temporarily stopped during traveling, and operates by receiving the driving force of the engine (10). The refrigerant is compressed by the compressor (111) and then condensed, expanded, and evaporated to cool the air, which is arranged in parallel with the compressor (111) and the motor (210). ), An electric compressor (2) having a compressor section (220) for compressing a refrigerant by driving
00) and a control device (130) for controlling the operation of the electric compressor (200), and the cooling device (110).
When the engine (10) is stopped during operation, in the vehicle cooling system in which the electric compressor (200) is operated by the control device (130), when the compressor (111) is operated by the engine (10). Also, the control device (1
30), the electric compressor (200) is operated for a first predetermined time (T1).

As a result, the electric compressor (200) is operated for the first predetermined time (T1) even while the compressor (111) is operating.
The refrigerant pipe (11) connected to the electric compressor (200) or to the electric compressor (200)
5a) retains the lubricating oil and the refrigerant when it stays in the compressor (11
1) Can be returned to the side. In addition, the electric compressor (20
When the 0) side lubricating oil or refrigerant is taken out to the compressor (111) side, the lubricating oil or refrigerant is returned to the electric compressor (200) side by operating the electric compressor (200). Therefore, the durability and the cooling performance of the compressor (111) or the electric compressor (200) can be improved without providing a switching valve or a check valve as in the prior art.

According to a second aspect of the invention, the engine (1
The control device (130) operates the electric compressor (200) for a first predetermined time (T1) every time the engine is started from the stopped state to the activated state.

As a result, when the compressor (111) is started by the engine (10), the lubricating oil staying on the electric compressor (200) side is returned to the compressor (111) side, and the compressor (111) is returned. Since there is no shortage of lubricating oil at the start of operation, the compressor (111) can be reliably operated.
The durability of can be improved.

According to the third aspect of the invention, the control device (1
30), the electric compressor (200) is intermittently operated for each first predetermined time (T1) at the second predetermined time (T2) intervals.

As a result, the lubricating oil and the refrigerant, which are accumulated in the electric compressor (200) side, are periodically discharged from the compressor (11).
Since it is returned to the 1) side, the durability of the compressor (111) and the cooling performance can be stabilized.

According to a fourth aspect of the invention, the control device (1
When the engine (10) is stopped, 30) operates the electric compressor (200) by an amount that can maintain the cooling capacity of the compressor (111) before that, and the engine (10) is in a stopped state. It is characterized in that the electric compressor (200) is operated only for a first predetermined time (T1) every time the engine is started from the above state.

For example, if the cooling capacity has a margin, the cooling capacity can be maintained without operating the electric compressor (200) even if the engine (10) is stopped.
It is conceivable that the lubricating oil and the refrigerant stay on the electric compressor (200) side for a long time. When the operation of the compressor (111) is repeated in such a situation, the lack of lubricating oil becomes particularly noticeable. According to the invention of claim 4,
The electric compressor (200) is operated for a first predetermined time (T1) each time the compressor (111) is started, whereby the electric compressor (200) is operated.
Similar to the invention described in (1), the operation does not start in the state where the lubricating oil is insufficient, and the durability of the compressor (111) can be surely improved.

In addition, additionally, since the electric compressor (200) which remains inactive for a long time is periodically operated, problems such as sticking between internal members of the electric compressor (200) are prevented. However, the smooth operation of the electric compressor (200) can be ensured.

Further, in the invention described in claim 5, the compressor (111) is a variable capacity compressor (111a) whose discharge capacity is variable by the control device (130), and the compressor is driven by the engine (10). When the (111) is operating, the control device (130) makes the discharge capacity of the compressor (111) larger than the discharge capacity required for cooling during the third predetermined time (T3). Is characterized by.

As a result, the lubricating oil and the refrigerant that stay in the electric compressor (200) side can be returned to the compressor (111) side with an increased discharge force (ie, suction force). Similar to the described invention, a compressor (111)
The durability and cooling performance of can be improved.

According to a sixth aspect of the invention, the control device (1
30) so that the discharge capacity of the compressor (111) is made larger than the discharge capacity required for cooling for the third predetermined time (T3) each time the engine (10) is started from the stopped state to the operating state. It is characterized by having done.

As a result, the lubricating oil and the refrigerant due to the operation of the electric compressor (200) when the engine (10) is stopped are
Since the compressor (111) whose discharge force has been increased immediately after the engine (10) is started can be returned to this compressor (111) side at a stroke, like the invention according to claim 2, in particular,
It is possible to prevent a lack of lubricating oil on the compressor (111) side, and reliably improve the durability of the compressor (111).

In the invention described in claim 7, the control device (1
30), the discharge amount of the compressor (111) is intermittently made larger than the discharge capacity required for cooling for every third predetermined time (T3) at intervals of the fourth predetermined time (T4). I am trying.

As a result, similarly to the third aspect of the present invention, the lubricating oil and the refrigerant when staying on the electric compressor (200) side are periodically returned to the compressor (111) side, so the compressor The durability of (111) and the cooling performance are stabilized.

In the invention described in claim 8, the control device (130) operates the electric compressor (200) for a first predetermined time (T1) immediately before the engine (10) is stopped. I am trying.

As a result, when the lubricating oil or the refrigerant is carried out from the electric compressor (200) side to the compressor (111) side, the lubricating oil or the refrigerant is returned to the electric compressor (200) side and immediately thereafter. The electric compressor (200) can be operated when the engine (10) is stopped later. Therefore, the electric compressor (200) side does not start to operate with insufficient lubricating oil, and the durability of the electric compressor (200) can be reliably improved.

Further, in the invention as set forth in claim 9, the control device (130) is arranged so that the running condition of the vehicle or the cooling device (11).
It is characterized in that the length of the first predetermined time (T1) is made variable according to the heat load of (0).

As a result, the electric compressor (200) is consumed for the first predetermined time (T1) while optimizing the amount of return to the compressor (111, 200) on the side where the lubricating oil or refrigerant is insufficient. The power can be minimized.

The reference numerals in parentheses of the above-mentioned means indicate the correspondence with the concrete means described in the embodiments described later.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention is shown in FIGS. 1 to 3, and its specific structure will be described below. The vehicle cooling device 100 is applied to a so-called idle stop vehicle in which the engine 10 is stopped when the vehicle is temporarily stopped during traveling, and as shown in FIG.
Cooling device 110, electric compressor 200, and control device 13
It consists of 0 and.

The cooling device 110 forms a well-known refrigeration cycle, and includes a compressor 111 for compressing the refrigerant in the refrigeration cycle to high temperature and high pressure, a condenser 112 for condensing and liquefying the compressed refrigerant, and a liquefied refrigerant. An expansion valve 113 for adiabatically expanding the refrigerant, and an evaporator 114 for evaporating the expanded refrigerant and cooling the air passing therethrough by the latent heat of evaporation are sequentially connected by a refrigerant pipe 115.

The compressor 111 operates the driving force of the engine 10 via a pulley and a pulley belt.

Next, the electric compressor 20 which is the main part of the present invention.
0 and the configuration of the control device 130 will be described.

The electric compressor 200 is provided with a compressor section 220 driven by a motor 210 that operates independently of the driving of the engine 10.

The compressor section 220 of the electric compressor 200 is arranged in parallel with the compressor 111 by the refrigerant pipe 115a, specifically, between the inflow side of the condenser 112 and the outflow side of the evaporator 114. Air conditioner 110 to be connected by
It is arranged inside.

The control device 130 controls the operation of the electric compressor 200, and signals from various sensors (not shown), that is, vehicle speed, engine speed, evaporator rear temperature, vehicle interior temperature, A Based on the / C request signal, the motor 210 is driven and the compressor section 220 is operated.

Further, the compressor 111 is provided in the control unit 130.
During the operation of the first predetermined time T2
A program for operating the electric compressor 200 for a predetermined time T1 is stored in advance.

The operation of this embodiment based on the above configuration will be described.

When the vehicle is traveling, that is, when the engine 10 is operating, the cooling device 110 operates normally.
That is, the compressor 111 operates by receiving the driving force of the engine 10 to compress the refrigerant, and the compressed refrigerant is
2. Condensation liquefaction, adiabatic expansion, and evaporation by the expansion valve 113 and the evaporator 114 in sequence, and the air passing through the evaporator 114 is cooled by the latent heat of evaporation.

However, since the applicable vehicle is an idle stop vehicle, when the vehicle is temporarily stopped, the engine 10
Is stopped and the compressor 111 using the engine 10 as a drive source does not operate. Therefore, basically, the electric compressor 200 is operated at this time. In the present invention, since the switching valve and the check valve as in the above-described conventional technology are not provided, the compressor 111 and the electric compressor 200 are alternately operated, so that the mounting positions of both the compressors 111 and 200 and the refrigerant. It is conceivable that the lubricating oil or the refrigerant accumulates in the other compressor 111, 200 while the one compressor 111, 200 is operating due to the refrigerant flow resistance of the pipes 115, 115a. Here, the electric compressor 200
Even when the compressor 111 is operating, the electric compressor 200 is operated intermittently (every predetermined time T2) for a predetermined time in order to prevent the lubricating oil from staying inside the refrigerant pipe 115a or inside the refrigerant pipe 115a. It is made to operate during T1.

Hereinafter, the electric compressor 2 by the control device 130
Details of the control of 00 will be described with reference to the flowchart shown in FIG.

First, in step S10, the electric compressor 20
0 is stopped. In step S20, it is determined from the A / C request signal whether or not there is a cooling request. If not, the process returns to step S10 and the stopped state of the electric compressor 200 is continued.

If there is a cooling request in step S20, the process proceeds to step S30, and it is determined whether or not there is an operation instruction of the compressor 111. If there is an operation instruction, the process proceeds to step S70 and the present embodiment Electric compressor 2 as a characteristic part
The intermittent control of 00 is performed, the details of which will be described later.

When it is determined in step S30 that there is no instruction to operate the compressor 111, the process proceeds to step S40, and it is determined from the vehicle speed signal whether or not the vehicle is stopped. If the vehicle is in the stopped state, it is determined in step S50 whether the engine 10 is in the stopped state based on the engine speed signal. If it is determined that the engine 10 is stopped, step S6
At 0, electric compressor control is performed when the engine 10 is stopped. That is, by operating the electric compressor 200 at this time, the cooling function is continued even if the engine 10 is stopped. Then, while the engine 10 is stopped, step S60 is continued and the electric compressor 200
Keeps working.

If it is determined in step S40 that the vehicle is not in a stopped state (running state), then step S5
When it is determined that the engine 10 is not in the stopped state (engine rotating state) at 0, the process returns to step S10 and the electric compressor 200 is stopped.

On the other hand, if there is an instruction to operate the compressor 111 in step S30, the electric compressor 200 is intermittently controlled in step S70. Specifically, as shown in the time chart of FIG. 3, when the vehicle is traveling and the engine 10 is operating, the original compressor 111 is operated, but during this period, the electric compressor 200 is operated. Is repeatedly operated for a predetermined time T1 at intervals of a predetermined time T2.

The operation and effect of the present embodiment will be described based on the above-mentioned configuration and operation description.

Even during the operation of the compressor 111, by operating the electric compressor 200 for a predetermined time T1, lubrication staying in the electric compressor 200 or in the refrigerant pipe 115a connected to the electric compressor 200. Since oil and refrigerant can be returned to the compressor 111 side, the durability and cooling performance of the compressor 111 can be improved.

Since the operation of the electric compressor 200 is intermittently repeated, the lubricating oil and the refrigerant are periodically returned to the compressor 111 side, and the compressor 11
The durability and cooling performance of No. 1 are stabilized.

It should be noted that the predetermined times T1 and T2 may be arbitrarily set in consideration of the retention status of the lubricating oil and the refrigerant and the effect of returning the electric compressor 200 to the compressor 111 side.

Further, if the timing for operating the electric compressor 200 for the predetermined time T1 is set at least at each starting time when the engine 10 shifts from the stopped state to the operating state, when the compressor 111 is started by the engine 10. Lubricating oil that has accumulated from the electric compressor 200 side is returned to the compressor 111 side, and the compressor 111 does not start operating when the lubricating oil is insufficient. Therefore, it is possible to reliably improve the durability of the compressor 111. it can.

(Second Embodiment) A second embodiment of the present invention is shown in FIG. FIG. 4 shows a compressor 111 and an electric compressor 20.
It is a time chart at the time of control of 0.
Although the basic configuration is the same as that of the first embodiment,
Here, it is assumed that the operation control pattern of the electric compressor 200 is changed.

First, the control of the electric compressor 200 when the engine 10 is stopped is controlled by the electric compressor 200 by the amount capable of maintaining the cooling capacity of the compressor 111 before the engine 10 is stopped, based on the vehicle interior temperature and the evaporator rear temperature signal. I am working. That is, the electric compressor 200 is not simply continuously operated while the engine 10 is stopped, but the electric discharge capacity and the discharge time of the compressor unit 220 are minimized.

The compressor 11 is driven by the engine 10.
For intermittent control when 1 is operating, the engine 10
The electric compressor 200 is operated for a predetermined time T1 each time the engine is started from the stopped state to the activated state.

For example, when the cooling capacity has a margin, the cooling capacity can be maintained without operating the electric compressor 200 even if the engine 10 is stopped, but the lubricating oil to the electric compressor 200 side is correspondingly increased. It is conceivable that the retention of the refrigerant continues for a long time. When the operation of the compressor 111 is repeated in such a situation, the lack of lubricating oil becomes particularly noticeable. According to the present embodiment, the electric compressor 200 is operated for a predetermined time each time the compressor 111 is started. By operating only T1,
The operation of the compressor 111 does not start when the lubricating oil is insufficient, and the durability of the compressor 111 can be reliably improved.

In addition, additionally, since the electric compressor 200, which remains inactive for a long time, is to be operated periodically, problems such as sticking between internal members of the electric compressor 200 are prevented, and electric compression is performed. The smooth operation of the machine 200 can be ensured.

(Third Embodiment) FIGS. 5 to 7 show a third embodiment of the present invention. In the third embodiment, by controlling the operation of the compressor 111 side, the lubricating oil and the refrigerant when they stay in the electric compressor 200 side are returned to the compressor 111 side.

As shown in FIG. 5, the vehicle cooling device 100.
The overall configuration is similar to that of the first embodiment, but here, the compressor 111 is a variable capacity compressor (hereinafter, compressor) 111a whose discharge capacity is variable, and a control device. This compressor 1 also serves as 130
The discharge capacity of 11a is controlled.

Specifically, the compressor 1 is driven by the engine 10.
When the vehicle 11a is operated, the original vehicle cooling device 110
The discharge capacity is set to be larger than the discharge capacity required for the load, and the engine 10 is operated for a third predetermined time T3 at the timing of start-up from the stopped state to the operating state, and thereafter, It is arranged to operate intermittently at intervals of a fourth predetermined time T4, and its program is stored in the controller 130 in advance.

Next, the operation (control) based on the above configuration will be described.

When the engine 10 is operating, the compressor 111 is operated and the cooling device 110 is operated. Further, when the engine 10 is stopped, the electric compressor 200 is operated instead of the compressor 111 and the cooling function is continued, and further detailed operation control of the compressor 111 is as follows.
This will be described below with reference to the flowchart shown in FIG.

First, in step S100, the compressor 111
To stop. In step S200, it is determined from the A / C request signal whether or not there is a cooling request. If not, the process returns to step S100 and the stopped state of the electric compressor 200 is continued.

If there is a cooling request in step S200, it is determined in step S300 based on the engine speed signal whether the engine 10 is stopped. If the determination is negative, that is, if the engine 10 is operating, step S4
At 00, the cooling capacity variable control is performed. Specifically, the discharge capacity of the compressor 111 is changed so as to match the load of the cooling device 110 based on the vehicle interior temperature signal and the evaporator rear temperature signal.

Further, the process proceeds to step S500 to control the forced capacity increase. As shown in the time chart of FIG.
The discharge capacity of No. 1 is set to be larger than the discharge capacity required for cooling to operate intermittently.
The discharge capacity is increased to the maximum value of its own capacity for a predetermined time T3 in accordance with the start timing of
The process is repeated at intervals of a predetermined time T4. After that, the process returns to step S200 and is repeatedly controlled.

On the other hand, if it is determined in step S300 that the engine is in the stopped state, the compressor 111 is stopped in step S600, and the process returns to step S200 to be repeatedly controlled.

The operation and effect of the present embodiment will be described based on the above-mentioned configuration and operation description.

Here, the compressor 111 is a variable capacity compressor 111a, and the compressor 11 is driven by the engine 10.
1 is operating, the discharge capacity is made larger than the discharge capacity required for cooling for the predetermined time T3, so that the discharge force (that is, the suction force) that increases the lubricating oil and the refrigerant staying on the electric compressor 200 side is increased. ), The compressor 111 can be returned to the side, and the durability and cooling performance of the compressor 111 can be improved.

The timing for increasing the discharge capacity is assigned at least when the engine 10 is started, and the electric compressor 200 when the engine 10 is stopped is assigned.
Since the lubricating oil and the refrigerant due to the operation of 1 can be immediately returned to the compressor 111 side by the compressor 111 having the increased discharge force immediately after the engine 10 is started, the operation can be started particularly when the lubricating oil is insufficient. Compressor 1 surely disappeared
The durability of 11 can be improved.

Further, since it is repeated at intervals of a predetermined time T4 thereafter, the lubricating oil and the refrigerant are periodically returned to the compressor 111 side, and the durability and cooling performance of the compressor 111 are stabilized. Be peeled off.

The third embodiment and the first embodiment may be combined to perform both the forced capacity increase control of the compressor 111 and the intermittent control of the electric compressor 200.

(Fourth Embodiment) FIG. 8 shows a fourth embodiment of the present invention. In the first to third embodiments described above, when the lubricating oil or the refrigerant stays on the electric compressor 200 side, the lubricating oil or the refrigerant is returned to the compressor 111 side. Lubricating oil and refrigerant are used in the electric compressor 200
The lubricating oil and the refrigerant are effectively returned to the electric compressor 200 side when they are taken out from the side to the compressor 111 side.

The basic structure is the same as that of the first embodiment, but the electric compressor 20 is operated while the compressor 111 is operating.
The timing of operating 0 for a predetermined time T1 is set to immediately before the engine 10 stops.

As a result, the lubricating oil and the refrigerant are discharged from the electric compressor 2.
When the oil is taken out from the 00 side to the compressor 111 side, this lubricating oil or refrigerant can be returned to the electric compressor 200 side, and the electric compressor 200 can be operated immediately after that when the engine 10 is stopped. Therefore, the electric compressor 200
Since the operation does not start in the state where the lubricating oil is insufficient on the side, the durability of the electric compressor 200 can be reliably improved.

(Fifth Embodiment) FIG. 9 shows a fifth embodiment of the present invention. In the first, second, and fourth embodiments described above, the predetermined time T1 for intermittently operating the electric compressor 200 is described as an arbitrarily fixed time, but in the fifth embodiment, the vehicle running condition or the cooling device 110. The length of the predetermined time T1 is changed according to the heat load of. Figure 9
3 is a flowchart showing control of the electric compressor 200, in which step S31 and step S32 are added to FIG.

Considering the case where the lubricating oil or the refrigerant stays on the electric compressor 200 side during the operation of the compressor 111, here, the length of the predetermined time T1 is based on the ratio of the idling time Ti to the traveling time Tr. Is made variable. That is, the controller 130 has a timer function,
In step S31, the integrated time ΣTi during idling and the integrated time ΣTr during running are calculated from the vehicle speed and the engine speed signal.
A ratio ΣTi / ΣTr of the integrated times of the two from the present time to a predetermined time before is obtained.

Then, based on this, in step S32, the length of the predetermined time T1 is determined. Specifically, the smaller the integrated time ratio ΣTi / ΣTr, the longer the predetermined time T1 and the integrated time ratio ΣTi / ΣTr.
The larger the Tr, the shorter the predetermined time T1.

A small cumulative time ratio ΣTi / ΣTr indicates that the idling state is small and the running state continues for a long time, and during that time, the amount of lubricating oil or refrigerant accumulated on the electric compressor 200 side increases. Therefore, the predetermined time T1
Is made longer to ensure that the accumulated amount is returned.
When the ratio ΣTi / ΣTr of the integration time is large, the above is reversed, the ratio of the idling state is high, and the electric compressor 2
00 also operates longer, so this electric compressor 20
Since the amount of the lubricating oil and the refrigerant staying on the 0 side is small, the predetermined time T1 can be short.

As a result, the electric power consumption of the electric compressor 200 for the predetermined time T1 is reduced to the required minimum while optimizing the amount of return to the compressor (here, the compressor 111) on the side where the lubricating oil or the refrigerant is insufficient. Can be limited.

The judgment data for changing the length of the predetermined time T1 may be based on the heat load of the cooling device 110. (Step S31 is referred to as a heat load calculation step.) In this case, the heat load is taken as a ratio Td / Ti of the idling time Ti to the operation time Td of the electric compressor 200, and for example, from the present time to a predetermined time before. It is used as an average value obtained from the number of idlings during the period. The smaller the ratio Td / Ti between the two times is, the longer the predetermined time T1 is.
The larger the i is, the shorter the predetermined time T1 is.

When the ratio Td / Ti of both times is small, the heat load of the cooling device 110 is low, the operating time of the electric compressor 200 during idling becomes short, and the lubrication staying on the electric compressor 200 side during that time. Since the amount of oil or refrigerant increases, the predetermined time T1 is lengthened to surely return the accumulated amount. When the ratio Td / Ti between both times is large, the above is the opposite, the heat load is high, and the electric compressor 200
Since the amount of lubricating oil and the amount of refrigerant that stays on the side of the electric compressor 200 is small, the predetermined time T1 is shortened. As a result, the same effect as when the predetermined time T1 is varied based on the traveling conditions is obtained.

Even when the compressor on the side where the lubricating oil or the refrigerant stays is the compressor 111 side, the fifth embodiment can be similarly applied.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an overall configuration in a first embodiment of the present invention.

FIG. 2 is a flowchart showing operation control of the electric compressor in FIG.

3A is a vehicle speed during control in FIG. 1, FIG. 3B is an engine speed, and FIG.
(D) is a time chart showing an ON-OFF state of the electric compressor.

FIG. 4 is a modification of the operation control pattern of the electric compressor according to the second embodiment, where (a) is a time chart showing the drive and stop states of the compressor, and (b) is an ON-OFF state of the electric compressor. Is.

FIG. 5 is a schematic diagram showing an overall configuration in a third embodiment.

FIG. 6 is a flowchart showing operation control of the compressor in FIG.

FIG. 7 is a time chart showing the vehicle speed, (b) engine speed, (c) compressor capacity, and (d) ON-OFF state of the electric compressor during control in FIG. is there.

FIG. 8 is a time chart showing an operation control pattern of an electric compressor according to a fourth embodiment, in which (a) shows a drive and stop state of the compressor and (b) shows an ON-OFF state of the electric compressor. Is.

FIG. 9 is a flowchart showing operation control of the electric compressor according to the fifth embodiment.

[Explanation of symbols]

10 engine 100 Vehicle cooling system 110 Air conditioner 111 compressor 111a Variable capacity compressor 130 control device 200 electric compressor 210 motor 220 Compressor section

Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) F02D 17/00 F02D 29/02 321A 29/02 321 29/04 B 29/04 F04B 49/00 A F04B 49/00 F25B 1/00 341S F25B 1/00 341 361G 361 361J F04B 49/02 331B 331F (72) Inventor Yasushi Suzuki 1-chome, Showa-cho, Kariya city, Aichi stock company Denso F-term (reference) 3G092 AC03 CA02 DG08 EA17 FA13 FA30 GA01 GA10 GB10 HE01Z HF04Z HF21Z 3G093 AA12 BA17 BA22 CA00 CA02 DA01 DB05 DB09 DB23 DB25 EB05 EB06 EC02 3H045 AA01 AA09 AA10 AA16 AA27 BA03 BA07 BA44 DA01

Claims (9)

[Claims] 1. The present invention is applied to a vehicle in which an engine (10) is stopped when the vehicle is temporarily stopped during traveling, and a compressor (111) which operates by receiving a driving force of the engine (10) is used. A cooling device (110) that cools air by condensing, expanding, and evaporating the refrigerant after compressing the refrigerant is arranged in parallel with the compressor (111), and is driven by a motor (210). Electric compressor (200) having a compressor section (220) for compressing a refrigerant
And a control device (130) for controlling the operation of the electric compressor (200), and the engine (10) during operation of the cooling device (110).
In the vehicle cooling device in which the electric compressor (200) is operated by the control device (130), the control device (130) controls the compressor (111) by the engine (10). Even when operating, the electric compressor (200) is operated for a first predetermined time (T1),
A cooling device for a vehicle, which is adapted to be operated. 2. The control device (130) is configured such that the engine (10) is started from a stopped state to an operating state at each startup.
The electric compressor (200) is operated for the first predetermined time (T1).
The air conditioner for a vehicle according to claim 1, wherein the air conditioner is operated only by the air conditioner. 3. The control device (130) is configured to intermittently operate the electric compressor (200) for the first predetermined time (T1) at intervals of a second predetermined time (T2). The vehicle cooling device according to claim 1 or 2. 4. The control device (130) is configured to control the compressor (1) before the engine (10) when the engine (10) is stopped.
The electric compressor (200) is operated only by an amount capable of maintaining the cooling capacity by 11), and the electric compressor (200) is started each time the engine (10) shifts from a stopped state to an operating state. The air conditioner for a vehicle according to claim 1, wherein the air conditioner is operated for the first predetermined time (T1). 5. The present invention is applied to a vehicle in which an engine (10) is stopped when a vehicle is temporarily stopped during traveling, and a compressor (111) operated by receiving a driving force of the engine (10). A cooling device (110) that cools air by condensing, expanding, and evaporating the refrigerant after compressing the refrigerant is arranged in parallel with the compressor (111), and is driven by a motor (210). Electric compressor (200) having a compressor section (220) for compressing a refrigerant
And a control device (130) for controlling the operation of the electric compressor (200), and the engine (10) during operation of the cooling device (110).
In the vehicle cooling device in which the electric compressor (200) is operated by the control device (130), the compressor (111) is variably controlled in discharge capacity by the control device (130). Variable capacity compressor (111
a), the control device (130) controls the discharge capacity of the compressor (111) for a third predetermined time (T3) when the compressor (111) is operating by the engine (10). A cooling device for a vehicle, characterized in that the discharge capacity is larger than that required for cooling. 6. The control device (130) is configured so that the engine (10) is started from a stopped state to an operating state at each start.
The vehicle cooling device according to claim 5, wherein the discharge capacity of the compressor (111) is made larger than the discharge capacity required for cooling for the third predetermined time (T3). 7. The control device (130) intermittently discharges a discharge capacity of the compressor (111) required for cooling at a third predetermined time (T3) at intervals of a fourth predetermined time (T4). The cooling device for a vehicle according to claim 5, wherein the cooling device has a capacity larger than the capacity. 8. The control device (130) is configured to operate the electric compressor (200) for the first predetermined time (T1) immediately before the engine (10) is stopped. Item 2. The vehicle cooling device according to Item 1. 9. The control device (130) is configured to change the length of the first predetermined time (T1) according to the traveling condition of the vehicle or the heat load of the cooling device (110). The vehicle cooling device according to any one of claims 1 to 4 and claim 8, which is characterized.