JPH0729536B2 - Vehicle refrigerator / air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air conditioner combined with a refrigerator including a refrigerator mounted on a vehicle, and particularly to an adjustment for increasing an idle rotation speed of an internal combustion engine during a refrigeration cycle operation. The present invention relates to a vehicle refrigerator / air conditioner having a function.

[Conventional technology]

An apparatus of this type is known in which a refrigerant for a refrigerator is obtained by branching a refrigerant pipe of an air conditioning evaporator, as shown in Japanese Utility Model Laid-Open No. 55-94216.

[Problems to be Solved by the Invention]

In such a refrigerator operation device, since the refrigerant supply to the air conditioning evaporator is reduced when the refrigerant is supplied to the refrigerator, there is a problem that the cooling effect by the air conditioning evaporator is reduced particularly when the internal combustion engine is idling. is there.

[Means for Solving the Problems]

The present invention adopts the following technical means in order to solve the above problems.

That is, in the present invention, (a) a compressor driven by an internal combustion engine capable of adjusting an idle rotation speed via an electromagnetic clutch, and (b) a compressor provided in a refrigeration cycle including this compressor, and blown into a vehicle interior. An air-conditioning evaporator that cools the air to be cooled, (c) a refrigerator evaporator that is provided in parallel with the air-conditioning evaporator in the refrigeration cycle, and cools the inside of the refrigerator; and (d) to both evaporators in the refrigeration cycle. Valve means provided to control the flow of the refrigerant; (e) a refrigerator operation device for issuing an operation command for the refrigerator; and (f) an air conditioning operation device for issuing an operation command for an air conditioner including the air conditioning evaporator. (G) A control hand for controlling the operation of the electromagnetic clutch and the valve means by receiving the signals of both the operation devices. And (h) the control means is configured to energize the electromagnetic clutch to freeze the compressor in the internal combustion engine when the air conditioner operation signal is generated by the air conditioner operation unit, and An air conditioning control means for controlling the valve means so that the refrigerant flows only into the evaporator; and (i) a refrigerator operated by the refrigerator operation device when an air conditioner operation signal is generated by the air conditioning operation device. When the operation signal of (3) is generated, the valve means is provided with a refrigerator control means for giving an intermittent signal for alternately flowing the refrigerant to the both evaporators, and (j) Further, when the operation signal of the air conditioner is generated. ,
When the idle rotation speed of the internal combustion engine is increased to a first value and both the operation signal of the air conditioner and the operation signal of the refrigerator are generated, the idle rotation speed of the internal combustion engine is changed to the first value. A technical measure is adopted, which comprises an idle adjustment means for increasing the second value to a higher value.

[Action]

According to the above technical means, when the air conditioner operation signal is output by the air conditioning operation device, the electromagnetic clutch is energized to operate the compressor, and the refrigeration cycle valve means is provided with refrigerant only in the air conditioning evaporator. Operate to the inflow state. Then, since the idle speed of the internal combustion engine is increased to the first value N1 (see FIG. 5), the compressor speed at the time of engine idling is increased by this increase, the refrigerant flow rate of the refrigeration cycle is increased, and the cooling speed is increased. You can increase your ability.

On the other hand, when the refrigerator operation signal is further output by the refrigerator operation signal while the air conditioning operation signal is being output by the air conditioning operation device, the refrigerant is alternately supplied to the air conditioning evaporator and the refrigerator evaporator by the valve means. Since the intermittent signal for flowing is given, the valve means intermittently repeats the opening / closing operation, and the refrigerant alternately flows into both the evaporators.

As a result, the vehicle interior cooling effect of the air-conditioning evaporator and the interior refrigerating effect of the refrigerator evaporator can be exhibited at the same time.

At this time, the refrigerant intermittently flows into the air-conditioning evaporator (for example, the refrigerant inflow for 50 seconds and the refrigerant inflow is stopped for 10 seconds). Therefore, the cooling capacity deterioration during idling with the lowest engine speed is a practical problem. However, in the present invention, in consideration of this point, the idle speed is increased to the second speed increase value N2 which is higher than the first speed increase value N1 during the air conditioning independent operation during the simultaneous air conditioning and refrigerating operation. Because of this, the compressor speed increases further due to the increase in speed due to this N2. As a result, it is possible to prevent the cooling capacity from being lowered due to the intermittent inflow of the refrigerant.

〔effect〕

In short, in the present invention, in the refrigeration cycle having the compressor driven by the internal combustion engine, the air conditioning evaporator and the refrigerator evaporator are connected in parallel,
By alternately and intermittently flowing the refrigerant into both of these evaporators, it is possible to achieve both air conditioning operation and refrigerator operation, and the first and second air conditioning operations that are compatible with the air conditioning independent operation and the air conditioning / refrigeration simultaneous operation, respectively. 2 idle acceleration values N1, N
2 can be set, and the effect of being able to secure the cooling capacity and refrigerating capacity during idling is great.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.

FIG. 1 shows a schematic cross-sectional view of the refrigerator 1, and FIG. 2 shows an overall system in which the refrigerator 1 and an air conditioner are combined.

As shown in more detail in FIG. 1, a convection blower motor 2 and an in-compartment cooling evaporator 3 are arranged in the refrigerator 1, and the refrigerator 1 has an opening / closing member (door) that can be opened and closed by a manual operation. ) 4 is provided. Evaporator 3
The refrigerant is supplied from the refrigeration cycle 5 shown in FIG. 2 driven by the internal combustion engine for traveling the automobile through the pipes 3A and 3B. This evaporator 3 has an upper layer portion.
At 3C, the airflow from the blower motor 2 is passed, at which time the airflow is cooled. This air flow passes through the refrigerating compartment 1A in the refrigerator as shown by the arrow, and then returns to the blower motor 2 through the lower passage of the evaporator 3. 1B shows contents such as canned juice stored in the refrigerating compartment 1A.

In the lower layer portion 3D of the evaporator 3, a compartment shielded from the air flow is formed to form a freezer compartment 1C. An appropriate opening / closing member 6 of a rotary type or a slide type is attached to the freezer compartment 1C. 1D shows an ice tray stored in the freezer compartment 1C. In the refrigerator 1, a heating element 7 that generates heat when energized is disposed in a passage where the air flow from the blower motor 2 reaches the refrigerating compartment 1A, for example, between the blower motor 2 and the evaporator 3. As the heating element 7, a honeycomb structure called a ceramic heater or the like is applied. In this embodiment, one having a particularly positive resistance-temperature coefficient is used. The heating element of this characteristic, which is commonly called a PTC heater, exerts a self-temperature adjusting action by increasing its own resistance value when its temperature reaches a predetermined value.

Then, the cooling action in the evaporator 3 is stopped,
When the heating element 7 is energized, the airflow is heated by the heating element 7 and heats the refrigerating compartment 1A. Therefore, as far as this embodiment is concerned, the refrigerator 1 can be said to be a refrigerator, a refrigerator and a refrigerator.

In the refrigerating compartment 1A, a temperature sensor 8 for detecting the air temperature in the refrigerator, for example, a thermistor is arranged, and is used for electric control of the refrigerator temperature described later.

As shown in FIG. 2, a cooling evaporator 3 of the refrigerator 1
Is arranged so that the refrigerant is supplied from the refrigeration cycle 5 of the air conditioner. That is, in this embodiment, the refrigerator evaporator 3 is connected in parallel with the evaporator 9 of the air conditioner.

The refrigeration cycle 5 has a compressor 10, which is mechanically connected to a rotating system (not shown) of an internal combustion engine for traveling a vehicle when the electromagnetic clutch 11 is electrically energized, whereby the compressor 10 rotates. The driven refrigerant is compressed and discharged. The refrigerant compressed by the compressor 10 passes through the circulation path shown by the arrow in the condenser 12
And the two evaporators mentioned above via the receiver 13
It is sent to 3, 9 and then returned to the compressor 10 again. Although not shown, a suitable pressure reducing means is a solenoid valve 14,15.
And between the evaporators 3 and 9.

As solenoid valve means for enabling the selective use of the two evaporators 3,9, two electromagnetic valves 14,15 that are heard when electrically powered are provided on the inlet side of each evaporator 3,9. . Thus, when the solenoid valves 14 and 15 are opened, the cooling action can be exerted by causing the refrigerant to flow into the corresponding evaporator 3 and / or evaporator 9.

In this case, the cooling effect of the evaporator 3 in the refrigerator 1 (that is, the refrigerating capacity of the refrigerating compartment 1A or the freezing compartment 1C)
(Refrigerating capacity of) is remarkably reduced when both solenoid valves 14 and 15 are open, compared to when only the solenoid valve 14 is open. This is due to the difference between the flow resistance on the refrigerator evaporator 3 side and that on the air conditioning evaporator 9 side. As far as this embodiment is concerned, the solenoid valves 14, 15
When both are open, the refrigerant hardly flows into the refrigerator evaporator 3.

Therefore, while the solenoid valve 14 is open,
If the flow resistance on the 15th side is adjusted, the amount of refrigerant passing through the refrigerator evaporator 3 can be adjusted, and thus the balance between the cooling effect of the refrigerator 1 and the cooling effect of the air conditioner can be adjusted. Therefore, in this embodiment, the solenoid valve 15 is intermittently closed, and the ratio of the closing time and the opening time (interruption ratio or duty ratio) of the solenoid valve 15 is determined by the cooling effect required for the refrigerator 1. By changing according to
Adjust the cooling effect of the refrigerator 1.

FIG. 2 also shows a block diagram of an electric control circuit for operating the refrigerator 1 and the refrigeration cycle 5 and adjusting the operating state of the refrigerator 1.

Reference numeral 16 denotes an electric circuit unit (refrigerator control means) prepared especially for controlling the operation of the refrigerator 1. Reference numeral 17 denotes an electric circuit section (air-conditioning control means) for controlling the operation of the air-conditioning apparatus including the air-conditioning evaporator 9.

A switch group 18 as an operation device for instructing the operation of the refrigerator 1 and a display device 19 for displaying the operation state of the refrigerator 1 are connected to the electric circuit unit 16, and the electric circuit unit 17 is also instructed to operate the air conditioner. A switch group 20 as an operating device and a display device 21 for displaying the operating state of the air conditioner are connected. Further, the former electric circuit section 16 is connected to an electromagnetic actuator 32 for increasing the idle rotation speed of the automobile internal combustion engine.

Although not shown, the electric circuit unit 17 for the air conditioner includes an electromagnetic clutch 11 for operating the compressor 10 of the refrigeration cycle 5, a solenoid valve 15, and an idle rotation speed when operating the air conditioner, which is similar to a known one. Means are included for supplying an energizing current to the electromagnetic actuator 33 that increases the current. It should be noted that the two electromagnetic actuators 32, 33 include two valves adapted to change the system of the passage bypassing the carburetor throttle valve (not shown). In addition, the electric circuit section 17
Is equipped with a gate circuit 22 consisting of a suitable logic gate for closing the solenoid valve 15 in response to the electric signal Sr from the electric circuit section 16 for the refrigerator. Then, the gate circuit
Although 22 permits the supply of the energizing current to the solenoid valve 15 when the electric signal Sc is in the energizing level according to the operation request of the air conditioner, but when the electric signal Sr is in the energizing level,
The supply of the energizing current to the solenoid valve 15 is prohibited regardless of the level of the electric signal Sc.

The two electric circuit units 16 and 17 operate in cooperation with each other, and in addition to the electric signal Sr requesting the electric circuit unit 17 to close the solenoid valve 15 as described above, the electric circuit An electric signal So indicating the operation of the compressor 10 is supplied from the section 17 to the electric circuit section 16. The role of the electric signal So is as follows.

That is, the cooling action of the refrigerator 1 and the cooling action of the air conditioner are provided by the compressor 10 of the common refrigeration cycle 5. When the refrigerator 1 is operated by operating the refrigerator switch group 18, the operating state of the compressor 10 Must be considered. As one method, when a command is issued by the switch group 18 to exert a cooling action in the refrigerator 1, the operation request signal of the compressor 10 can be sent from the electric circuit unit 16 to the electric circuit unit 17. . However, in this embodiment, when the energizing current is being supplied to the electromagnetic clutch 11 by the air conditioning electric circuit unit 17, the compressor operation signal So is sent to the electric circuit unit 16 and the electric circuit unit 16 receives it. Only when the electric signal Sr
Is intermittently applied to adjust the cooling action of the refrigerator 1.

The electric circuit section 16 is connected to the blower motor 2, the heating element 7, and the solenoid valve 14, which are the functional elements of the refrigerator 1, by an electric wire. One of these functional elements 2, 7 and 14 is connected to the positive and negative terminals or the ground terminal, and the other end is to the electric circuit section.
It is connected to the switch element in 16 (described later). Further, the electric circuit section 16 is connected to the temperature sensor 8 in the refrigerator, and based on the input signals from the temperature sensor 8, the switch group 18 and the like, and the compressor operation signal So from the electric circuit section 17, the functional elements.
It produces an electrical signal Sr requesting the activation, deactivation of 2,7,14 and the intermittent activation of the solenoid valve 15.

The thick broken line in the figure indicates the positive side power supply line from the vehicle battery to the electric circuit parts 16 and 17 and the blower motor 2. This power supply line connects a key switch and, if necessary, a dedicated switch (including relay contact) in series. Core switch
By turning on 23, electric power is supplied to the illustrated electric circuit.

Next, the detailed configuration and operation of the electric circuit section 16 for controlling the refrigerator 1 will be described with reference to FIG.

The refrigerator switch group 18 includes two movable pieces 18A, 18
B includes a structure that opens and closes fixed contacts at 3 positions each, and the 3 positions are divided into warm (H), neutral (N), and cool (I), and operate as a freezer, refrigerator and as a refrigerator. It is configured to selectively command and.

Further, the switch group 18 includes a switch 18C for adjusting the cooling capacity of the refrigerator 1. This switch 18C adjusts the cooling capacity of the refrigerator 1,
As a result, it also serves to adjust the cooling capacity of the air conditioner. In this embodiment, when the switch 18C is closed, the cooling capacity of the refrigerator 1 is increased and when the switch 18C is opened, the cooling capacity of the air conditioner is decreased.

The display device 19 is connected to the fixed contacts H and I corresponding to the movable piece 18B of the switch group 18. The display device 19 includes a red light emitting diode 19A connected to the heating side contact H of the movable piece 18B and a blue light emitting diode 1 connected to the cooling side contact I of the movable piece 18B.
9B and a current limiting resistor 19C, and is connected to the circuit package 24 via the current limiting resistor 19C.

Among the functional elements of the refrigerator 1, the solenoid valve 14 is a switch group 18
Is connected between the cooling side fixed contact I of the movable piece 18A and the ground. Therefore, when the switch group 18 selects the operation of the refrigerator 1, the solenoid valve 14 is immediately supplied with the energizing current, and the solenoid valve 14 is opened.
Is connected between the power lines via the open / close contact of the relay 25, and the relay 25 is connected between the heating side contact H of the movable piece 18A and the ground. Therefore, when the switch group 18 selects the operation of the refrigerator, the normally open contact of the relay 25 is closed and the heating element 7 is immediately supplied with the energizing current to start the heat generation.

The circuit package 24 includes a cooling request signal Si that becomes an energizing level when the switch group 18 selects the refrigerator operation, a heating request signal Sh that becomes an energizing level when the refrigerator operation is selected,
And the control signal Sm generated by opening and closing the switch 18c for adjusting the cooling capacity.

The circuit package 24 includes a control circuit 26 for the blower motor 2,
An intermittent signal generation circuit 27 that generates an electric signal Sr for intermittently energizing the solenoid valve 15, a drive circuit 28 of the display device 19, and a logic gate 29 for signal reception and a logic gate 30 for signal transmission. There is.

The logic gate 29 for receiving the signal is an AND gate in this embodiment, and the compressor activation signal So is
When the cooling request signal Si from the switch group 18 becomes the activating level, the line 29A is set to the activating level.

The blower control circuit 26 includes a relay 26A having a normally open relay contact connected in series with the blower motor 2, a drive transistor 29B thereof, an OR gate 26C, an AND gate 26D, and a comparison circuit 26E connected to the temperature sensor 8. It

In the blow control circuit 26, when the cooling request signal Si is at the energizing level, the AND gate 26D is "opened" based on the line 29A being at the energizing level, that is, the compressor 10 being in the operating state. In this case, the output terminal of the AND gate 26D is connected to the control signal Sb appearing at the output terminal of the comparison circuit 26E.
A logic signal having an energizing / de-energizing level corresponding to The output signal of the AND gate 26D is applied to the control input terminal of the drive transistor 26B via the OR gate 26 ° C. After all, the transistor 26B is the control signal of the comparison circuit 26E.
It conducts and cuts off in accordance with Sb, thereby closing and opening the contact of the relay 26A.

When the resistance value of the temperature sensor 8 having a negative temperature coefficient of resistance is larger than a predetermined value of about 0 ° C. in the refrigerator temperature, that is, when the temperature becomes lower, the comparison circuit 26E makes the deactivation level. If the temperature is higher than that, a control signal Sb is generated which becomes the energizing level. It should be noted that in this comparison circuit 26E, appropriate hysteresis is added.

That is, when the cooling request signal Sr is at the energizing level, the blower control circuit 26 operates and stops the blower motor 2 according to the operation of the comparison circuit 26E based on the operation state of the compressor 10. Here, the comparison circuit 26E has a role of preventing the inside temperature from becoming too cold by stopping the blower motor 2 to stop agitation of the inside air when the inside temperature drops below a predetermined temperature. Hold.

In the blower control circuit 26, a storage request signal Sh is given to the other input terminal of the OR gate 26C. Therefore, when the heating request signal Sh reaches the energizing level, the transistor 26B
Immediately conducts, and activates the blower motor 2 by energizing the relay 26A.

The intermittent signal generating circuit 27 may have a clock pulse counting type digital circuit configuration or an analog circuit configuration as exemplified in this embodiment. The intermittent signal generating circuit 27 shown in the figure includes a triangular wave oscillating circuit 27A that generates a triangular waveform voltage having a constant slope at a constant cycle, and an output terminal that compares this output waveform with a predetermined threshold voltage value from the reference voltage source 27B. A comparator circuit 27C that generates a pulse train signal (intermittent signal) at
The reference voltage source 27B is configured by a voltage adjusting circuit 27D that changes the threshold voltage value generated by the reference voltage source 27B in two steps. In this configuration, the threshold voltage value generated by the reference voltage source 27B is
By changing the voltage adjustment circuit 27D based on the adjustment signal Sm, it is possible to change and adjust the interruption ratio of the intermittent signal.

Here, the voltage adjusting circuit 27D is composed of an inverter gate, and generates a signal which becomes an energizing level when the switch 18C of the switch group 18 is closed and an energizing level when the switch 18C is opened.

This signal is applied to the analog switch 27d of the reference voltage source 27B shown in detail in FIG. The reference voltage source 27B is provided with resistors 27a and 27a when the analog switch 27d is open.
The divided voltage of b is given to the comparison circuit 27C, but when the analog switch 27d is closed by closing the switch 18C,
By connecting resistor 27C in parallel with resistor 27a,
Raise the voltage at the junction of 27a and 27b.

Therefore, in the comparison circuit 27C, the discontinuity ratio in the closed state of the switch 18C takes a larger value than the discontinuity ratio (energizing time / deenergizing time) of the intermittent signal in the open state of the switch 18C.

The intermittent signal generated by the intermittent signal generating circuit 27 is sent to the electric circuit section 17 as the electric signal Sr via the logic gate 30 which is an AND gate. Thus, the inflow of the refrigerant from the refrigeration cycle 5 to the refrigeration evaporator 3 is intermittently performed by the intermittent ratio of the intermittent signal generated by the intermittent signal generating circuit 27, and the cooling capacity of the refrigerator 1 is adjusted. Logic gate 30 has a role of sending an intermittent signal only when it is determined by logic gate 29 that cooling request signal Si is at the energizing level and compressor operation signal So is at the energizing level.

The drive circuit 28 includes a drive transistor 28A connected to the current limiting resistor 19C of the display device 19, and an OR gate 2B connected to its control input terminal. The line 29A is connected to one of the two input ends of the OR gate 2B, and the heating request signal Sh is applied to the other. This allows
Transistor 28A is conductive when either cooling request signal Si is at the energizing level and compressor 10 is in the operating state and line 29A is at the energizing level, or when heating request signal Sh is at the energizing level. Light emitting diodes 19A and 1
Energize one side of 9B to light it.

The drive circuit 31 is composed of a drive transistor 31A connected to an electromagnetic actuator 32 for improving the capacity when using the refrigerator. The transistor 31A energizes the electromagnetic actuator 32 when the cooling request signal Si is at the energizing level and the compressor actuation signal So is at the energizing level and the line 29A is at the energizing level, thereby increasing the idle rotation speed. Therefore, the engine speed at idle-up is set as shown in FIG.

That is, when the compressor operation signal So from the electric circuit 17 is at the energizing level, first, the electromagnetic actuator 33 on the air conditioning side is energized to increase the idle rotation speed to the first value N ₁ , and at this time the refrigerator 1 also operates. Then, the electromagnetic actuator 32 on the refrigerating side is energized to increase the idle rotation speed to the higher second value N ₂ .

The operation of this device will be summarized. When the cooling contact (I) is turned on in the refrigerator switch group 18, the solenoid valve 14 is energized so that the refrigerator evaporator 3 shown in FIG. Opened. At this time, when the electric signal So of the energizing level indicating the operation of the compressor 10 is given from the electric circuit section 17 for air conditioning, the circuit package 24 electrically controls the operation of the refrigerator and lights the light emitting diode 19B. And display it to the crew. Further, the idle speed is increased to N ₂ .

As a control method of the refrigerator operation, the energizing circuit of the blower motor 2 is opened and closed based on the air temperature in the refrigerator detected by the temperature sensor 8, and the stirring operation is performed when the air temperature in the refrigerator is high,
If the air temperature in the refrigerator is low, stop stirring.

In addition, the intermittent signal generating circuit 27 generates an intermittent signal having a predetermined interruption ratio and sends it as an electric signal Sr to the air-conditioning electric circuit section 17, thereby intermittently closing the solenoid valve 15 in FIG. In this case, the amount of refrigerant flowing into the evaporator 3 for the refrigerator is adjusted, and thus the cooling capacity of the refrigerator 1 is adjusted.

In this case, the intermittent signal intermittent ratio is the switch group 18
Since the switch 18C has a larger value in the closed state than the open state in the switch 18C, the balance of the cooling capacities of the refrigerator 1 and the air conditioner can be changed by the switch 18C. As an example of the intermittent ratio, the valve opening time / valve closing time of the solenoid valve 15 may be 10 seconds / 50 seconds as opposed to 5 seconds / 55 seconds.

In this case, since the idle speed of the internal combustion engine is increased to the second value N ₂ which is higher than the first value N _1, the rotation speed of the compressor 10 is increased by the increased speed and the refrigerant of the refrigeration cycle is increased. The flow rate increases. As a result, it is possible to prevent a reduction in the cooling capacity of the air conditioner during idling.

On the other hand, in the switch group 18, when the contact for heat storage (H) is turned on, the heating element 7 is energized, and the energizing circuit of the blower motor 2 is closed to stir the air inside the refrigerator and refrigerate it. Room 1A is uniformly heated. Further, the light emitting diode 19A is turned on to display the heating operation to the occupant.

The above-described embodiment of the present invention can be modified into further embodiments based on the claims.

For example, in addition to changing the cooling capacity of the refrigerator 1 on / off with the switch 18C, if a variable resistor is used and connected to the reference voltage source 27B, it can be continuously changed.

Further, the switch 18C, which is a capacity adjuster, can also be provided with an indicator showing the open / closed state.

Further, the refrigerator electric circuit unit 16 can be realized by program control of a microcomputer in a form combined with the air conditioning electric circuit unit 17 if necessary.

Further, the means for increasing the idle rotation speed is provided with a known feedback type idle speed control device instead of using the two electromagnetic actuators 32 and 33, and the target idle rotation speed corresponds to whether the refrigerator is used or not. You may make it change. The target value of the idle rotation speed to be increased may be changed according to the temperature detected by the internal temperature sensor 8 of the refrigerator 1.

Further, in the configuration of FIG. 3, the signal of the internal temperature sensor 8 is compared with a preset value, and the transistor 31A is energized only when the preset value is exceeded so that the electromagnetic actuator 32 operates. Good.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of a refrigerator, FIG. 2 is a configuration diagram showing an overall system in which a refrigerator and an air conditioner are further combined, and FIG. Is an electric connection diagram showing a concrete circuit of an electric circuit part for a refrigerator, FIG. 4 is an electric connection diagram showing a circuit configuration of a reference voltage source in FIG. 3, and FIG. 5 is a setting of idle rotation speed. It is a characteristic diagram. 1 …… Refrigerator, 3 …… Refrigerator evaporator, 5 …… Refrigeration cycle, 9 …… Air conditioner evaporator, 10 …… Compressor, 11 …… Electromagnetic clutch, 14,15 …… Solenoid valve (valve means),
16 …… Electric circuit for refrigerator (control means for refrigerator), 17…
… Air conditioning electric circuit (air-conditioning control means), 18 …… Refrigerator operating switch group, 20 …… Air conditioning operating switch group, 32,33 …… Electromagnetic operation to increase idle speed Vessel (idle adjustment means).

Claims (1)

[Claims] 1. A compressor, which is driven by an internal combustion engine capable of adjusting an idle rotation speed through an electromagnetic clutch, and (b) which is provided in a refrigeration cycle having this compressor and is blown into a vehicle interior. An air conditioning evaporator that cools air; (c) a refrigerator evaporator that is provided in parallel with the air conditioning evaporator in the refrigeration cycle and cools the inside of the refrigerator; and (d) a refrigerant flow to both evaporators in the refrigeration cycle. And (e) a refrigerator operation device for issuing an operation command of the refrigerator, and (f) an air conditioning operation device for issuing an operation command of an air conditioner including the air conditioning evaporator, (G) a control means for controlling the operation of the electromagnetic clutch and the valve means, the signals of the both operating devices being inputted, ) The control means energizes the electromagnetic clutch to freeze the compressor in the internal combustion engine when a signal for operating the air conditioner is generated by the air conditioner controller, and the refrigerant flows only into the air conditioner evaporator. (I) When an operation signal for the air conditioner is generated by the air conditioner operation device, an operation signal for the refrigerator is generated by the refrigerator operation device. A refrigerator control means for applying an intermittent signal to the valve means to alternately flow the refrigerant to both evaporators, and (j) further, when an operation signal of the air conditioner is generated,
When the idle rotation speed of the internal combustion engine is increased to a first value and both the operation signal of the air conditioner and the operation signal of the refrigerator are generated, the idle rotation speed of the internal combustion engine is changed to the first value. A vehicle refrigerator / air conditioner having an idle adjusting means for increasing the second value to a higher value.