JP2001213150A - Air conditioner for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an uncomfortable feeling of variation in cooling capacity produced when a compressor power source used in an on-vehicle refrigerating cycle is switched from a vehicle traveling drive device to a motor. SOLUTION: This air conditioner for a vehicle is formed so that a drive source for driving a compressor 9 of a refrigerating cycle 25 mounted on a vehicle can be switched between an internal combustion engine 22 and a compressor driving motor 23 different from the internal combustion engine 22. After the conditions for stopping the internal combustion engine 22 are judged to be established, the cooling capacity when the compressor 9 is driven by the internal combustion engine 22 is moved steppingly to that when the compressor 9 is driven by the motor 23. After that, the drive source of the compressor 9 is switched from the internal combustion engine 22 to the motor 23.

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 in which a compressor of a refrigeration cycle mounted on a vehicle is switched between a driving device for driving the vehicle and a motor for driving a compressor different from the driving device for driving. Related to the device.

[0002]

2. Description of the Related Art In a vehicle such as an idle stop car or a hybrid car in which an internal combustion engine used for traveling temporarily stops, a compressor driven by the internal combustion engine is used in a refrigeration cycle. When the internal combustion engine is stopped, the refrigeration cycle stops operating,
There is a disadvantage that the desired cooling capacity cannot be obtained. For this reason, in the prior art, for example,
2. Description of the Related Art A compressor for a vehicle air conditioner as disclosed in Japanese Patent No. 324668 is known.

[0003] This is because it is necessary to maintain the cooling capacity even if the internal combustion engine is stopped while the vehicle is stopped due to a signal waiting or the like. Is kept driven.

[0004]

However, since the driving force of the motor is generally smaller than the driving force of the internal combustion engine, the compressor has been driven by the internal combustion engine to maintain the cooling in the passenger compartment. If the drive source of the compressor is suddenly switched from the internal combustion engine to the motor, the cooling capacity obtained when the compressor was driven by the internal combustion engine cannot be maintained, and the temperature of the air blown into the vehicle compartment will increase rapidly. There is an inconvenience of causing an unpleasant sensation by causing a great rise. To avoid this, it is sufficient to increase the driving force of the motor.However, if a motor of the same level as the driving force of the internal combustion engine is required, the power consumption of the motor will increase significantly, and the size of the motor will increase and the installation space will increase. Inconveniences such as difficulty in securing the space.

Therefore, according to the present invention, in a vehicle air conditioner in which a power source of a compressor used in an on-board refrigeration cycle is switched between a driving device for driving such as an internal combustion engine and a motor, the driving source of the compressor is a driving source for driving. It is an object of the present invention to provide a vehicle air conditioner that can reduce discomfort caused by a change in cooling capacity that occurs when switching from a device to a motor.

[0006]

In order to achieve the above object, a vehicle air conditioner according to the present invention comprises a driving source for driving a compressor of a refrigeration cycle mounted on a vehicle, a driving source for driving the vehicle. An air conditioner for a vehicle, which is switched between an apparatus and a motor for driving a compressor different from the driving apparatus for driving, wherein a judging means for judging that a condition for stopping the driving apparatus for driving is satisfied, and the judging means After it is determined that the condition for stopping the traveling drive device is satisfied, the cooling capacity when driving the compressor with the traveling drive device is changed to the cooling capacity when driving the compressor with the motor. Cooling capacity shifting means for shifting by the cooling capacity shifting means to a cooling capacity when the compressor is driven by the motor. It is characterized in that the driving source of the compressor from the traveling drive device to the after and a compressor drive source switching means for switching the motor (claim 1).

Therefore, after the condition for stopping the traveling drive device is set, the drive source of the compressor is not immediately switched to the motor, but the cooling capacity is stepped down to the cooling capacity when the compressor is driven by the motor. Since the switching is performed after the shift, even if the driving force of the motor and the driving force of the traveling drive device are different, it is possible to avoid the discomfort caused by the rapid change in the cooling capacity. According to such control, it is possible to reduce the load on the driving device for driving by reducing the time during which the driving device for driving is operated for cooling while reducing the discomfort caused by the fluctuation of the cooling capacity. An air conditioner for a vehicle can be provided.

As a more specific configuration example of the above configuration, while controlling the air conditioning equipment to adjust the cooling capacity,
In a vehicle air conditioner, a driving source for driving a compressor of a refrigeration cycle is switched between a driving device for driving a vehicle and a motor for driving a compressor different from the driving device for driving. Determining means for determining that a condition for stopping the operation is satisfied; first target cooling capacity calculating means for calculating a target cooling capacity when the compressor is driven by the traveling drive device; and A second target cooling capacity calculating means for calculating a target cooling capacity in the case of being driven by the controller, and the cooling capacity is changed to the first cooling capacity after the determination means determines that a condition for stopping the power source of the vehicle is satisfied. Steps are taken from the target cooling capacity calculated by the target cooling capacity calculating means to the target cooling capacity calculated by the second target cooling capacity calculating means. A cooling capacity transfer means for controlling the air conditioning equipment to shift to the above, and when the cooling capacity has converged to the target cooling capacity calculated by the second target cooling capacity calculation means by the cooling capacity transfer means, A compressor drive source switching means for switching a drive source of the compressor from the traveling drive device to the motor may be provided.

In such a configuration, after the condition for stopping the traveling drive device is established, the cooling capacity is calculated from the target cooling capacity calculated by the first target cooling capacity calculating means by the second target cooling capacity calculating means. Since the drive source of the compressor is switched from the drive for driving to the motor after stepwise shifting to the target cooling capacity calculated in the above, in the process where the drive source of the compressor is switched from the drive for drive to the motor, suddenly Thus, it is possible to avoid the unpleasant feeling accompanying the rapid change in the cooling capacity.

Further, in the above configuration, the time from when the condition for stopping the power source of the vehicle is determined by the determination means to when the transition of the cooling capacity is started by the cooling capacity transition means is determined by the time of the drive source. The shorter the switching frequency, the shorter the switching frequency may be.

According to such a configuration, when the driving source of the compressor is switched from the driving device for driving to the motor, the time until the start of the transfer of the cooling capacity is adjusted according to the switching frequency of the driving source of the compressor. Is done. In other words, when the switching frequency is low, the cooling performance when the compressor is being driven by the traveling drive device is already used to the cooling performance. . Therefore, in such a case, the transition to the motor of the driving source is suppressed as much as possible by extending the time until the transition of the cooling capacity by the cooling capacity transition means is started. vice versa,
When the switching frequency is high, since the interior of the vehicle compartment is approaching the cooling state to a certain extent when the compressor is driven by the motor, even if the time until the start of the transition of the cooling capacity is shortened, the feeling is impaired. In this case, the load on the traveling drive device is reduced by switching the driving source of the compressor to the motor in advance of the transition of the cooling capacity.

Further, the difference between the cooling capacity when the compressor is driven by the driving device and the cooling capacity when the compressor is driven by the motor is equal to or larger than a predetermined value. (Claim 4). More specifically, the transition of the cooling capacity by the cooling capacity transition means is determined by comparing the target cooling capacity calculated by the first target cooling capacity calculation means with the target cooling capacity calculated by the second target cooling capacity calculation means. This may be performed when the difference is equal to or larger than a predetermined value (claim 5).

When the difference between the cooling capacity when the compressor is driven by the traveling drive device and the cooling capacity when the compressor is driven by the motor is small,
Even if the drive source of the compressor is suddenly switched from the drive unit for driving to the motor, there is little possibility that a sense of incongruity due to the fluctuation of the cooling capacity is generated. Therefore, after stepwise shifting from the cooling capacity when driving the compressor by the driving device to the cooling capacity when driving the compressor by the motor, the drive source of the compressor is switched from the driving device to the motor after the step described above. The control is particularly effective when the difference between the cooling capacity when the compressor is driven by the driving device for driving and the cooling capacity when the compressor is driven by the motor is equal to or larger than a predetermined value.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, the vehicle air-conditioning control device has an intake switching device 4 provided with an inside air inlet 2 and an outside air inlet 3 on the most upstream side of an air conditioning duct 1, and the introduction ratio between inside air and outside air is changed to an intake door. 5 to be adjusted. In the air-conditioning duct 1, a blower 7 rotated by a motor 6 is provided so as to face the inlet, and the rotation of the blower 7 sucks air from the inlet,
The pressure is sent to the downstream side.

An evaporator 8 is arranged downstream of the blower 7. The evaporator 8 is connected to the compressor 9, the condenser 10, the expansion valve 11, and the like to form a refrigeration cycle 25. Thus, the refrigerant is supplied to the evaporator 8 to cool the air passing through the evaporator 8.

On the downstream side of the evaporator 8, a heater core 12 that uses cooling water of an internal combustion engine as a heat source is disposed.
An air mix door 13 is provided in front of the heater core 12. With respect to the air that has passed through the evaporator 8, the ratio of the air that passes through the heater core 12 to the air that bypasses the heater core 12 is adjusted by the air mix door 13.

The evaporator 8 and the heater core 1
The air whose temperature has been adjusted by the air conditioner 2 flows from the air outlets (defrost air outlet 16, vent air outlet 17, foot air outlet 18) opened and closed by mode doors 14 and 15 provided at the most downstream side of the air conditioning duct 1. 20 is blown.

The compressor 9 includes an electromagnetic clutch 21
The transmission of the driving force from the internal combustion engine 22 is performed by ON / OFF control of the electromagnetic clutch 21 through ON / OFF.
It is turned off. A motor 23 for driving the compressor is directly connected to the drive shaft of the compressor 9 so that the motor 23 can receive a driving force.
By controlling, transmission of the driving force from the motor 23 to the compressor 9 is turned on / off.
And ON / OFF control of these electromagnetic clutches 21;
The drive source of the compressor 9 can be switched from the internal combustion engine 22 to the motor 23 or from the motor 23 to the internal combustion engine 22 by ON / OFF control of energization to the motor 23.

Reference numeral 30 denotes an inside air sensor for detecting the temperature inside the vehicle,
31 is an outside air sensor that detects the temperature outside the vehicle compartment, 32 is a solar radiation sensor that detects the amount of solar radiation, 33 is a suction temperature sensor that detects the temperature of the air taken into the air conditioning duct, and 34 is a temperature setting that sets a target temperature in the vehicle compartment. Reference numeral 35 denotes various switches for manually setting various air-conditioning operations. Detection signals from these sensors, setting signals from the temperature setting device, and signals from various switches are input to the control unit 36. Further, a signal from the internal combustion engine stop condition detecting means 37 for detecting that the condition for stopping the internal combustion engine is satisfied is input to the control unit 36. Here, the internal combustion engine stop condition detecting means 37 is not particularly limited, but a vehicle speed sensor for detecting a vehicle speed is used, and a condition for stopping the internal combustion engine 22 upon detecting that the vehicle speed has become zero is satisfied. A device that detects that the operation has been performed can be considered.

The control unit 36 includes a central processing unit (CPU) (not shown), a read-only memory (ROM), a random access memory (RAM), an input / output port (I / O), and the like. , Various doors (intake door 5, air mix door 13, mode door 14,
15) Drive control of actuators 41, 42, 43 for driving, ON / O of electromagnetic clutch 21 of compressor 9
It has a drive circuit for performing FF control, rotation control of a motor 23 for driving the compressor, and ON / OFF control of energization of the motor 23, and various input signals are inputted according to a predetermined program given to a ROM. Processing, switching of blowing capacity, switching of suction mode, compressor 9
Of the air mix door 13 is controlled.

FIG. 2 is a flow chart showing an example of the air conditioning control by the control unit 36.
An operation example of the air conditioning control will be described based on this flowchart.

After the air conditioner is operated, the control unit 36
Various sensors (inside air sensor 3)
0, an outside air sensor 31, a solar radiation sensor 32, etc.) and a signal from the temperature setting device 34 are input (step 50). Then, based on signals from these various sensors and the set temperature, a target blow-off temperature X1 allowed when the drive source of the compressor 9 is the internal combustion engine 22 is calculated (step 5).
2). Further, based on the signals from the various sensors and the capability of the motor 23, the target blowing temperature X2 allowed when the driving source of the compressor 9 is the motor 23 is calculated (step 54). Since the driving ability of the compressor 9 by the motor 23 is smaller than the driving ability of the compressor 9 by the internal combustion engine 22, X1 is generally lower than X2 (X1 <X2).

Then, in the next step 56, it is determined whether or not the stop condition of the internal combustion engine 22 is satisfied. This determination is, for example, whether or not a signal for detecting that the condition for stopping the internal combustion engine 22 has been satisfied by the internal combustion engine stop condition detecting means 37 of FIG. Is determined not to be satisfied (if the signal output from the internal combustion engine stop condition detecting means 37 is not input when the condition for stopping the internal combustion engine 22 is satisfied), the electromagnetic clutch 2
1 is turned on, the power supply to the motor 23 is turned off, and the internal combustion engine 22 drives the compressor 9 to perform normal air conditioning control (air conditioning control when the internal combustion engine is driven).

On the other hand, when it is determined that the stop condition of the internal combustion engine 22 is satisfied (when the condition for stopping the internal combustion engine 22 is satisfied, the internal combustion engine stop condition detecting means 37)
Is input), the difference between the target outlet temperature X1 and the target outlet temperature X2 (ΔX = X2-X
It is determined whether 1) is smaller than a predetermined value α (step 6).
0), if it is determined that it is smaller than the predetermined value α, even if the drive source of the compressor 9 is suddenly switched from the internal combustion engine 22 to the motor 23, there is no large change in the target outlet temperature.
In this case, since there is little possibility that the temperature of the air blown into the cabin changes greatly and gives the occupant a feeling of discomfort,
As shown in (a), the drive source of the compressor 9 is quickly switched from the internal combustion engine 22 to the motor 23 as in the related art. That is, if it is determined in step 60 that it is smaller than α, the internal combustion engine 22 is stopped at the same time that the stop condition of the internal combustion engine 22 is satisfied (step 76), and the air conditioning control (motor The driving air conditioning is performed (step 78). Then, the number of times of switching to the motor drive is counted in step 80.

The air conditioning control at the time of driving the internal combustion engine shown at step 58 and the air conditioning control at the time of driving the motor shown at step 78 are the same as the conventional air conditioning control. Then, as shown in FIG. 3, for example, based on the target blowing temperature calculated in step 52, the mode doors 14 and 15 are controlled to blow out the temperature-controlled air as shown in FIG. An outlet control for selecting the outlet 17 and the foot outlet 18) is performed (step 82), and the number of revolutions of the air mix door 13 and the blower 7 is controlled to reduce the outlet air temperature to the target outlet temperature X.
1 (steps 84 and 86), and controls the intake door 5 to perform suction port control for selecting an air suction port (step 88). Control is performed (step 90). In the case of air-conditioning control at the time of driving the motor, for example, based on the target outlet temperature calculated in step 54, similarly, as shown in FIG. Is performed (step 82), and the number of revolutions of the air mix door 13 and the blower 7 is controlled to adjust the outlet air temperature to the target outlet temperature X2 (steps 84 and 86). 5
Control the air inlet to select the air inlet.
The compressor control such as the discharge capacity of the compressor 9 and ON / OFF is performed (step 90).

Here, the control method for setting the blown air temperature to the target blow temperature is not particularly limited. For example, the blow air temperature is converged within a predetermined range to the target blow temperature using PID control or the like. A method of controlling the control amount of the air mix door 13 and the blower 7 may be used.

On the other hand, in step 60, the difference between the target outlet temperature X1 and the target outlet temperature X2 (ΔX = X2
-X1) is determined to be equal to or greater than the predetermined value α,
The drive source of the compressor 9 is changed from the internal combustion engine 22 to the motor 23.
If the air conditioner is switched suddenly, the target air temperature changes greatly, and the air temperature of the air outlet changes greatly, which may cause discomfort to the occupant. Therefore, in this case, the processes of steps 76 to 80 are performed after the processes of steps 62 to 74 are performed.

That is, in step 62, it is determined whether or not a predetermined time has elapsed since the previous switch to the motor drive. This predetermined time is set to such a time that the state in which the compressor 9 is driven by the internal combustion engine 22 continues and the occupant in the vehicle cabin gets used to the air-conditioning environment when the compressor is driven by the internal combustion engine 22. I have. If it is determined in step 62 that the predetermined time t has elapsed since the previous motor drive, the number counted in step 80 is reset (step 6).
4) The start time T (time from when the stop condition of the internal combustion engine is achieved) T of the cooling suppression control to be described later is set to a time τ previously determined by experiment for each vehicle type (step 66).
In step 62, the timer used to determine whether or not a predetermined time has elapsed is reset and started (step 68).

If it is determined in step 62 that the predetermined time has not elapsed since the last drive of the motor, the start time of the cooling suppression control (the time from when the stop condition of the internal combustion engine is achieved) T Is set as the time (τ / n) obtained by dividing the time τ previously determined by experiment for each vehicle type by the number n counted in step 80 (step 7).
0), the timer is reset and started (step 68).

Then, in the next steps 72 and 74, the cooling suppression control as shown in FIG. 4B is performed until the blown air temperature matches the target blowout temperature during motor driving within a predetermined range. In this cooling suppression control, after the cooling suppression start time calculated in step 66 or 70 has elapsed after the stop condition of the internal combustion engine 22 has been achieved, the cooling capacity is gradually reduced, and the compressor 9 is driven by the motor 23. In this case, the cooling capacity is shifted to the allowable cooling capacity. More specifically, the target blowing temperature is calculated based on the target blowing temperature calculated in step 52 when the compressor is driven in step 52 and the motor driving calculated in step 54. The air temperature of the air mix door 13 is gradually changed to the target outlet temperature stepwise so as to follow the changed target outlet temperature.
It is realized by adjusting the opening degree of the fan and the rotation speed (blowing capacity) of the blower 7.

Therefore, the drive source of the compressor 9 is switched from the internal combustion engine 22 to the motor 2
In the process up to switching to 3, the cooling capacity of the air conditioner is gradually reduced from the cooling capacity when the driving source of the compressor 9 is the internal combustion engine 22 to the cooling capacity when the motor 23 is used, Then the internal combustion engine 2
2 is stopped and the drive source of the compressor 9 is switched to the motor 23, so that there is no sudden change in the cooling capacity as in the prior art, and the drive source of the compressor 9 is
Even if it switches to, the feeling will not be harmed.

Further, according to the configuration in which the switching to the motor is performed, it is not necessary to keep the internal combustion engine 22 constantly operating at the time of cooling in order to secure the cooling capacity. The fuel consumption of the vehicle can be saved, and both the request for improving the fuel efficiency and the request for improving the air conditioning environment in the vehicle compartment can be made compatible.

Further, according to this configuration, the target blowing temperature X
(ΔX = X1−X2) is equal to or greater than a predetermined value α (ΔX ≧ α), and a condition for switching the drive source of the compressor 9 from the internal combustion engine 22 to the motor 23 ( If a predetermined time has elapsed since the previous motor drive at the time when the internal combustion engine stop condition) is satisfied, the occupant is accustomed to the coolness when the drive source of the compressor 9 is the internal combustion engine 22. Step 66 to minimize the switching of the driving source of Step 9
Is set to τ, and after this time τ has elapsed, FIG.
The cooling suppression control of (b) is performed.

On the other hand, the difference (ΔX = X1−X2) between the target outlet temperature X1 and the target outlet temperature X2 is smaller than the predetermined value α (ΔX <α), and the driving source of the compressor 9 is the internal combustion engine 22. If the predetermined time has not yet elapsed since the previous motor drive at the time when the condition for switching to the motor 23 (the internal combustion engine stop condition) is satisfied, the drive source is started after the timer of step 68 is started. Number of times the internal combustion engine 22 has been switched to the motor 23,
The start time T of the cooling suppression control is calculated according to the switching frequency of the drive source of the compressor 9.

Since this cooling suppression control start time T is calculated by τ / n, the greater the number of times the drive source of the compressor 9 has been switched from the internal combustion engine 22 to the motor 23, that is, the drive source of the compressor 9 The higher the switching frequency, the shorter. That is, if the driving source of the compressor 9 has been switched to the motor 23 many times so far, the temperature in the passenger compartment increases, and the occupant is close to the cooling state when the compressor 9 is driven by the motor 23. Therefore, in this case, even if the control is promptly shifted to the cooling suppression control, the feeling is hardly impaired.
The higher the switching frequency of the driving source, the shorter the start time T of the cooling suppression control, and for example, the cooling capacity is controlled so as to have the characteristic shown by the broken line in FIG.

In other words, according to this configuration, the occupant's bodily sensation that changes according to the frequency of switching of the drive source of the compressor 9 is taken into account, and air conditioning control that makes it difficult to give a sense of incongruity due to a change in cooling capacity during switching can be realized. Becomes

Further, according to the above configuration, the difference (ΔX = X1−X) between the target outlet temperature X1 and the target outlet temperature X2.
If 2) is equal to or greater than the predetermined value α, cooling suppression control is performed, and α
If it is smaller, the drive source is
Even if the switching is suddenly performed, the uncomfortable feeling due to the change in the cooling capacity at the time of the switching is small, so that the drive source of the compressor 9 is quickly switched from the internal combustion engine 22 to the motor 23. Therefore, when the difference (ΔX = X2−X1) between the target outlet temperature X1 and the target outlet temperature X2 is small,
It is possible to quickly switch to the motor drive to prolong the motor drive time, and accordingly to improve the fuel efficiency of the internal combustion engine 22. That is, since it is not necessary to delay the switching until the change in the cooling capacity at the time of the switching is small, in such a case, the motor 23 is quickly switched when the internal combustion engine stop condition is satisfied, thereby improving the fuel efficiency. It is possible to satisfy both the request and the request for improving the air conditioning environment in the passenger compartment.

In the above configuration, the case where the internal combustion engine 22 is used as the driving device for running the vehicle has been described.
In an electric vehicle such as an electric vehicle that uses a traveling motor as a traveling drive device, the present invention can be similarly used when switching from a traveling motor to a compressor driving motor 23 different from the traveling motor. The same operation and effect as described above can be obtained.

Further, in the above-described configuration, the case where the internal combustion engine stop condition detecting means 37 is configured to detect that the vehicle speed has become zero has been described, but the vehicle does not necessarily need to be stopped. For example, when the vehicle is traveling at a low speed due to traffic congestion, or when the vehicle is traveling stably, the traveling drive device such as the internal combustion engine 22 is switched to the motor 23, and the traveling drive device is stopped in some way. It may be one that detects or determines that the conditions for making the condition are satisfied.

[0040]

As described above, according to the air conditioner for a vehicle according to the present invention, when it is determined that the condition for stopping the driving device for driving is satisfied, the compressor is driven by the driving device for driving. The cooling capacity of the compressor is stepwise shifted to the cooling capacity when the compressor is driven by the motor, and then the driving source of the compressor is switched from the driving device for driving to the motor. It is possible to reduce discomfort caused by a change in cooling capacity that occurs when switching from the driving device to the motor. Further, according to such control, the time for driving the driving device for cooling can be reduced as in the conventional case. If the driving device for driving is an internal combustion engine, a request for saving fuel consumption and a request for cooling are performed. And a request for improving a comfortable air-conditioning environment.

Further, if the time from when the condition for stopping the power source of the vehicle is determined to be satisfied to when the transition of the cooling capacity is started is shortened as the frequency of switching of the drive source of the compressor increases, When the switching frequency is low, the transition control of the cooling capacity is performed so as to maintain the tendency, so that a feeling of strangeness due to the fluctuation of the cooling capacity can be hardly felt. Conversely, when the switching frequency is high, there is not much resistance to the cooling capacity when the compressor is driven by the motor,
By shortening the time until the start of the transfer of the cooling capacity, the transfer of the drive source to the motor can be performed quickly, and the load on the traveling drive device can be reduced.

Further, the transition of the cooling capacity by the cooling capacity transition means is performed by determining the difference between the cooling capacity when the compressor is driven by the driving device for driving and the cooling capacity when the compressor is driven by the motor by a predetermined magnitude. If the configuration is performed in the above case, since the feeling of discomfort is more likely to occur as the change in the cooling capacity when the drive source is switched is increased, in such a case, by changing the cooling capacity stepwise, Discomfort caused by changes in cooling capacity can be reduced, and when the change in cooling capacity when the drive source is switched is small, the drive source is quickly switched from the drive unit for driving to the motor as in the past, and the vehicle is driven. The load on the driving device for the vehicle can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of a vehicle air conditioner according to the present invention.

FIG. 2 is a flowchart illustrating an example of a control operation in a control unit illustrated in FIG. 1;

FIG. 3 is a flowchart schematically showing the air conditioning control when the internal combustion engine is driven and the air conditioning control when the motor is driven in FIG. 2;

FIG. 4 is a characteristic line showing a change from the cooling capacity at the time of driving the internal combustion engine to the cooling capacity at the time of driving the motor by the blowing temperature. FIG. 4A is a target blowing temperature at the time of driving the motor. X1 and the difference between the target outlet temperature X2 when the internal combustion engine is driven (Δ
X = X1−X2) is smaller than the predetermined value α.
FIG. 4B shows a difference (ΔX = X1−X) between the target blowing temperature X1 when the motor is driven and the target blowing temperature X2 when the internal combustion engine is driven.
It is a figure which shows each characteristic when 2) is more than predetermined value (alpha).

[Explanation of symbols]

 9 Compressor 22 Internal combustion engine 23 Motor 25 Refrigeration cycle

Claims (5)

[Claims] 1. A vehicle in which a driving source for driving a compressor of a refrigeration cycle mounted on a vehicle is switched between a driving device for driving the vehicle and a motor for driving a compressor different from the driving device for driving. In the air conditioner for use, determining means for determining that the condition for stopping the travel driving device is satisfied; and determining that the condition for stopping the travel drive device is satisfied by the determination means, the driving for travel is performed. Cooling capacity transfer means for stepwise shifting the cooling capacity when the compressor is driven by the device to the cooling capacity when the compressor is driven by the motor; and the motor being driven by the motor by the cooling capacity transfer means. After switching to the cooling capacity, the drive source of the compressor is switched from the traveling drive device to the motor. An air conditioner for a vehicle, comprising: a compressor drive source switching means for switching. 2. A driving source for driving a compressor of a refrigeration cycle is controlled by controlling an air conditioner to control a cooling capacity, and a driving device for driving a vehicle and a driving device different from the driving device for driving the compressor are used. In a vehicle air conditioner that is switched by a motor, a determination unit that determines that a condition for stopping the traveling drive device is satisfied, and a target cooling capacity when the compressor is driven by the travel drive device. A first target cooling capacity calculating means for calculating the target cooling capacity when the compressor is driven by the motor; a second target cooling capacity calculating means for calculating a target cooling capacity when the compressor is driven by the motor; After it is determined that the conditions for stopping are satisfied, the cooling capacity is calculated from the target cooling capacity calculated by the first target cooling capacity calculating means. Cooling capacity transition means for controlling the air conditioner so as to step-by-step shift to the target cooling capacity calculated by the second target cooling capacity calculation means; Air conditioner for a vehicle, comprising compressor drive source switching means for switching the drive source of the compressor from the driving device for driving to the motor when the target cooling capacity calculated by the capacity calculating means is converged. apparatus. 3. The switching frequency of the driving source is defined as the time from when the condition for stopping the power source of the vehicle is determined by the determining means to when the transition of the cooling capacity is started by the cooling capacity shifting means. 3. The vehicle air conditioner according to claim 1, wherein the shorter the distance, the shorter the distance. 4. The transition of the cooling capacity by the cooling capacity transition means is performed by a difference between a cooling capacity when the compressor is driven by the traveling drive device and a cooling capacity when the compressor is driven by the motor. 2. The air conditioner for a vehicle according to claim 1, wherein the control is performed when is larger than a predetermined size. 5. The transfer of the cooling capacity by the cooling capacity transfer means is performed by the target cooling capacity calculated by the first target cooling capacity calculation means and the target cooling capacity calculated by the second target cooling capacity calculation means. 3. The air conditioner for a vehicle according to claim 2, wherein the air conditioning is performed when a difference between the air conditioner and the difference is equal to or larger than a predetermined value.