JPS59202361A - Controller for compressor of air conditioner for automobile - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Summary of the Invention) The present invention provides an air conditioner for an automobile in which a compressor for compressing refrigerant is connected to an automobile engine via a belt transmission device. This relates to a control device.

(Conventional example) When the temperature of the refrigerant gas discharged from a compressor for an automobile air conditioner becomes high, seizure occurs in the sliding parts within the compressor. known from. As one of the conventional examples, the invention described in Japanese Utility Model Application Publication No. 56-115592 can be mentioned. This system has a temperature detector that detects when the compressor reaches a predetermined temperature or higher, and a means for cutting off the power supply to the compressor based on the output of this temperature detector. When the temperature reaches that temperature, the compressor stops driving to prevent seizure from occurring.

However, whether or not the compressor seizes depends solely on the compressor temperature.
7) For example, even though it has a relationship with the rotational speed of the compressor, this point is not considered at all in the above conventional example). In many cases, the cooling capacity is suddenly stopped, resulting in a deterioration of the cooling feeling, and when controlling the compressor to increase the braking force during deceleration, the braking force may be reduced. There was a drawback that the chopsticks could not be raised and the compressor could not be controlled.

(Purpose and Structure of the Invention) Therefore, 1. the present invention eliminates the conventional drawbacks caused by the fact that the drive of the compressor stops immediately when the temperature exceeds a predetermined temperature as described above, and protects the compressor more appropriately. The object of the present invention is to provide a control device that can perform control for the purpose of achieving this object, and the first configuration for achieving this object is shown as a block diagram in FIG. 1, and the second configuration is shown as a block diagram in FIG. There is.

That is, in FIG. 1, an engine 1 of an automobile and a compressor 2 for compressing refrigerant are connected via a belt transmission device 3. As shown in FIG. The belt transmission device 3 includes a pulley ratio conversion mechanism 8 that is, for example, a two-stage pulley and converts the pulley ratio, and an electromagnetic clutch 9 that connects and connects the driving force from the engine 1 to the compressor 2. Further, a temperature detector 29 for detecting the temperature of the compressor 2 and a level setting means 50 for setting the temperature level are provided, and the determining means 6
0, it is determined to which temperature level the detected temperature from the temperature detector 29 belongs. Furthermore, in the control means 70, a control system is selected according to the determination result of the determination means 60, and in each control system, based on a predetermined input signal, the boost ratio converter 8 of the belt transmission device 3 and the electromagnetic clutch are selected. 9. Therefore, since the belt transmission device 3 is controlled by appropriately selecting a control system depending on the temperature level of the compressor 2, the above object can be achieved.

On the other hand, the second configuration shown in FIG.
The electromagnetic clutch 9, and the temperature detector 29 are the same as those in the first configuration, but a rotation speed detector 80 for detecting the rotation speed of the engine 1 is newly provided, and the level setting means 50' stores information in advance. The temperature-rotation speed level is set based on the set value, and the determining means 60' determines to which temperature-rotation speed level the detected temperature and the detected rotation speed from the temperature detector 29 and the rotation speed detector 80 belong. is determined. Then, in accordance with the determination result of the determination means 60', the control means 70 performs the same control as that shown in the first configuration, and therefore the aforementioned problem can be achieved in the same way.

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) A first embodiment of the present invention is shown in FIGS. 3 to 5. First, the hardware of this embodiment will be explained based on FIGS. 3 and 4. The engine 1 and the compressor 2 for compressing refrigerant are connected via a belt transmission device 3, which will be described later. This constitutes a closed cooling cycle.

The belt transmission device 3 is, for example, as shown in FIG.
It has a pulley ratio conversion mechanism 8 and an electromagnetic clutch 9. This pulley ratio conversion mechanism 8 is a two-stage pulley, and V-belts 12a and 12b are stretched between the large-diameter pulley 10 and the small-diameter pulley 11, respectively. Also, large diameter pulley 1
0 is connected to the engine body 1 via the ball bearing 13.
4, and surrounds an electromagnet 15 fixed to the engine body 14. A crankshaft J6 is inserted into the center of this large-diameter pulley lO, a mount 17 is fixed to the tip of the crankshaft 16, and a small-diameter pulley 11 is rotatable with respect to this mount 17 via a ball bearing 18. Supported.

Further, a one-way clutch 19 is interposed between the small-diameter pulley 11 and the mount 17, and is configured to couple the two only when the rotation of the crank shirt 1-16 is faster than the rotation of the small-diameter pulley 11. A clutch plate 21 is provided on the mount 17 via a leaf spring 20, and this clutch plate 21 is connected to the large diameter pulley 10 on the opposite magnet side.
When the electromagnet 15 is excited, the clutch plate 21 is attracted to the large diameter pulley 10. Therefore, when the electromagnet 15 is in a demagnetized state, when the crankshaft 16 rotates, the crankshaft 16 and the small diameter pulley 11 are coupled via the one-way clutch 19, and the small diameter pulley 11 is used to connect the pulley 22 of the electromagnetic clutch 9 as described below. While driving, the large diameter pulley 10 rotates freely. On the other hand, when the electromagnet 15 is excited, the clutch plate 21 is attracted to the large-diameter pulley 10, and the large-diameter pulley 10 drives a boo U 22 of the electromagnetic clutch 9, which will be described below, and the rotation of the small-diameter pulley 11 is caused by the rotation of the crankshaft 1.
6, the connection by the one-way clutch 19 is released, the small diameter pulley 11 rotates freely, and the pulley ratio is changed.

On the other hand, the electromagnetic clutch 9 has a pulley 22 rotatably supported on the compressor main body 24 via a ball bearing 23, and the belts 12a, 1
2b are stretched with the same radius. This pulley 2
2 surrounds an electromagnet 25 fixed to the compressor main body 24, and a drive shaft 26 is inserted through the center of the pulley 22. A clutch plate 27 is supported by the drive shaft 26, and the pulley 22
is facing. Therefore, when the electromagnet 25 is in a demagnetized state, the pulley 22 and the drive shaft 26 are not coupled, so the pulley 22 rotates freely and no driving force is transmitted. 2
2, the clutch plate 27 is attracted to the pulley 22 and the drive shaft 26.
are connected, and the driving force is transmitted to rotate the drive shaft 26. This is so that the driving force is intermittent.

In this embodiment, the pulley ratio conversion mechanism 8 is provided on the engine side, and the electromagnetic clutch 9 is provided on the compressor side. Alternatively, it may be a known method that continuously changes the pulley ratio.

In order to control the pulley ratio conversion mechanism 8 and the electromagnetic clutch 9, a microcomputer 2 is used in this embodiment.
The microcomputer 28 in which 8 is used is
Central processing unit CPU, memory ROM that stores program procedures and fixed data, memory RA that can read and write data
This is a well-known device equipped with M, input/output ports, etc. This microcomputer 16 receives analog signals from a temperature detector 29 and a heat load detector 30 through a multiplexer 3.
1, and is further converted into a digital signal via the A/D converter 32 and input. The temperature detector 29 is configured such that a heat sensitive element such as a thermistor is disposed in the discharge chamber of the compressor 2 and detects the temperature of the compressor 2 as a voltage value. In addition, the heat load detector 3
0 is a temperature setting device that sets the temperature inside the vehicle, a temperature detector inside the vehicle that detects the temperature inside the vehicle, an outside temperature detector that detects the outside temperature, a solar radiation amount detector that detects the amount of solar radiation, and a fin temperature of the evaporator 7. It consists of an evaporator temperature detector, etc. And the microcomputer 28
The above signals are compared and processed, and control signals are sent to the pulley ratio conversion mechanism drive circuit 33 and the electromagnetic clutch drive circuit 34, respectively, to control the pulley ratio conversion mechanism 8 and the electromagnetic clutch 9.

Next, the software in this embodiment will be explained based on the flowchart of FIG. 5. The microcomputer 28 is stored in the memory ROM from the start step 40 by closing an ignition key switch and an air conditioner switch (not shown) and turning on the power. Execution of the stored program is started, and in the next step 41, a selection signal is sent to the multiplexer 31 to select the signal from the temperature detector 29, and the signal from the compressor 2 is detected via the A/D converter 32. The temperature Tc is input as a digital signal and stored at a predetermined location in the memory RAM.

In the next step 42, a set value T1 (corresponding to 140° C., for example) is stored in advance in the memory ROM.
Read out. The upper and lower sides of this set value T1 are defined as temperature levels, and thereby the temperature level setting means 50 shown in FIG.
is configured.

In the next step 43, the detected temperature Tc detected in step 41 is compared with the set value T1 read out in step 42, and whether the detected temperature Tc belongs to the first temperature level of Tc<Tt or Tc≧T1. A determination is made as to whether the temperature belongs to the second temperature level, and thereby the determination means 60 shown in FIG. 1 is configured.

If it is determined in step 43 that the temperature belongs to the first temperature level where Tc<TI, step 44.
On the other hand, if it is determined that the temperature belongs to the second temperature level of T c ≧TI, the process proceeds to step 46.
Proceed to the general limit control system of step 45 or step 4.
When the process of step 6 is completed, the process returns to step 41 again.

A normal control system allows free control of the pulley ratio.
In step 44, the restriction is released by, for example, clearing a flag, allowing the pulley ratio to shift to the high rotation side, and in step 45, the multiplexer 31
A selection signal is sent to A and the signal from the heat load detector 30 is
/D converter 32, calculates a control signal suitable for the heat load, and sends the control signal to pulley ratio conversion mechanism drive circuit 33. On the other hand, the general restriction control system calculates a control signal in step 46 in the same manner as in step 45, but prohibits the pulley ratio from shifting the rotation of the compressor l to the high speed side. Electromagnet 15
A control signal is sent to the pulley ratio conversion mechanism drive circuit 33 so as to constantly demagnetize the pulley ratio conversion mechanism. These steps 44 to 46 constitute the control means 70 shown in FIG. While we hope that the temperature in 2 will return to a safe level, we can ensure a minimum amount of cooling capacity during that time. Particularly when the compressor 2 is a vane type as in this embodiment, the burning of the vanes (not shown) is not effective because it depends only on the temperature of the compressor 2, but the burning of the drive shaft 26 or the rotor (not shown) Regarding this, it depends on the rotation speed of the compressor 2, and it is extremely effective because seizure can be prevented by lowering the rotation speed of the compressor 2. In this embodiment, the input signal is from the heat load detector 30, but is not limited to this, and instead of the heat load detector 30, a pressure detector is used in the booth 1 to provide input signals during acceleration and deceleration. Various input signals can be used, such as controlling the load on the engine 1 by the compressor 2, or controlling the power by operating the compressor 2 using an economy switch. This has the advantage of eliminating the need to stop driving the compressor 2 even if the pressure rises, thereby preventing loss of control.

(Second Embodiment) A second embodiment of the present invention is shown in FIGS. 6 to 8, but only the aspect of the level setting means 50 is different from the first embodiment. The level setting means 50 will be explained, and common parts will be given the same numbers in the drawings and their explanation will be omitted.

First, the differences in hardware will be explained based on FIG. 6. In this second embodiment, the engine 1
A rotation speed detector 80 is added to detect the rotation speed of the engine. The rotation speed detector 80 detects the rotation speed of the engine 1 as a digital signal obtained by shaping the voltage signal of the ignition coil 82, whose primary current is interrupted and connected by the distributor 81, by a waveform shaping circuit 83, for example. This detected rotation signal is detected by the microcomputer 2B.
is input.

Next, the differences in software will be explained based on FIGS. 7 and 8. In this second embodiment, the first
Step 90.91 instead of step 42 in the embodiment of
is inserted, and in step 60, the detected rotational speed Ne is input from the rotational speed detector 80. Then, in the next step 91, a predetermined function f(
The set value T1 is obtained and determined as T1=f(Ne) according to the set value TI, and the temperature level is determined by the upper and lower sides of this set value TI, thereby forming the level setting means 50 shown in FIG. .

Therefore, according to this embodiment, since the temperature level is corrected based on the rotational speed of the engine 1, more appropriate control for protecting the compressor can be performed.

(Third Embodiment) In FIG. 9, a third embodiment of the present invention is shown, but since only the software is different compared to the first embodiment, a description of the hardware will be omitted. , the differences in software will be explained.

That is, in step 100 after step 41, which is common to the first embodiment, the first set value T1 (corresponding to, for example, 140° C.) and the second set value T2 (corresponding to 140° C.) stored in the memory RQM in advance are This step 100 constitutes the level setting means 50 having three temperature levels.

In the next step 101, it is determined whether or not Tc<TI. If T1 is above Tc, the process proceeds to step 102. In this step 102, it is determined whether or not Tc ('r2). 101. In 102, a first temperature level where the detected temperature Tc is 1゛c<T1,
T1≦T c <second temperature level of Co2 or T2≦
It is determined which of the third temperature levels Tc belongs to, and in steps 101 and 102, the determination means 6
Configure 0.

If the temperature falls within the first temperature level of Tc<T+, there is no risk of the compressor seizing.
Proceed to steps 44 and 45 similar to the first embodiment, and if the temperature falls under the second temperature level of TI≦TC<T2, the compressor can be prevented from seizing by shifting the pulley ratio to the low rotation side. Since it can be considered as a caution level,
The process proceeds to step 46, which is similar to the first embodiment. However,
If it belongs to the third temperature level of T2≦Tc, it can be considered as a dangerous level where there is a risk of seizure even if the rotation of the compressor is shifted to the low rotation side, so the stop control system is selected and the step The process proceeds to step 103, where a stop control signal is sent to the electromagnetic clutch drive circuit 34 shown in FIG. 4 to stop driving the compressor.

Therefore, according to this embodiment, the compressor can be protected more reliably. Furthermore, steps 45 and 46
After that, a step 104 is provided to control the compressor on and off based on heat load etc., and these steps 44
46 and steps 103 and 104 constitute the control means 70.

(Fourth Embodiment) A fourth embodiment of the present invention is shown in FIGS. 10 and 11, and the hardware of this fourth embodiment is similar to that of the second embodiment. Yes, and the software is
90', 91 instead of step 42 in the embodiment of
' is inserted, and the level determining means 50 has a configuration substantially similar to that of the second embodiment. That is, step 9
0', the rotational speed N detected by the rotational speed detector 80 is
e is input, and in the next step 91', predetermined functions f (N e ), 'G (N e ) shown in FIG.
Set values TI and T2 according to T'+ = f (N e
), T 2 = G (N O), and the third
As in the embodiment, three temperature levels are set, and the effect is a combination of the second embodiment and the third embodiment.

(Fifth Embodiment) In FIG. 12, a fifth embodiment of the present invention is shown. In this fifth embodiment, the hardware is the same as that of the first embodiment, and only software is used. are different.

That is, if it is determined in step 43 that the temperature belongs to the first temperature level of T c < T I, the process proceeds to steps 111 and 112 and the normal control system is selected;
If it is determined that the temperature belongs to the second temperature level of upper T1, the process advances to step 113. In this step 113, it is determined whether the compressor is being driven.

If the result of step 113 is YES, the process proceeds to steps 111 and 112. In other words, the normal control system is selected even when the detected temperature Tc follows the first temperature level where Tc < T I, or even when Tc belongs to the second temperature level where Tc ≥ T+. This is when the compressor is being driven.

On the other hand, if the determination in step 113 is No, that is, if the detected temperature belongs to the second temperature level of Tc≧T1 and the compressor drive is stopped, then the special Select the limit control system. here.

The special restriction control system refers to a control system that prohibits the pulley ratio from shifting the rotation of the compressor to the high speed side until a predetermined period of time has elapsed since the compressor moved from the stopped state to the driving state.First, in step 114, the pulley ratio is set to In the next step 115, the compressor is controlled to be on/off, and the process proceeds to the next step 116. In this step 116, it is determined whether or not the compressor has been driven, and if the compressor has been stopped, a circulation process is performed which returns to step 115, and on the other hand,
If the compressor is activated, steps 117-1
A timer process indicated by 2σ is performed, and when a predetermined time has elapsed, the process proceeds to step 121, and the pulley ratio is returned to normal control. These steps 111 to 121 constitute the control means 70.

The reason for selecting the special limit control system in this way is that the most common occurrence of compressor seizure is when the compressor suddenly rotates at high speed from a stopped state. This is to prevent the compressor from seizing by restricting it to the rotation side, while minimizing the restriction of the drive of the compressor to the low rotation side.

(Sixth to Eighth Embodiments) Fig. 13 shows the sixth embodiment of the present invention, Fig. 14 shows the seventh embodiment of the above, and Fig. 15 shows the eighth embodiment of the invention. Both embodiments are slightly modified versions of the fifth embodiment, and the modified parts have already been explained in the sections of the second to fourth embodiments, so the same numbers are assigned to the drawings. The explanation will be omitted.

(Ninth to Twelfth Embodiments) While the first to eighth embodiments correspond to the first invention shown in FIG.
The second embodiment corresponds to the second invention shown in FIG.

Therefore, the ninth embodiment will be explained first. Since the hardware of the ninth embodiment is the same as that of the second embodiment, based on FIGS. 16 and 17 while referring to FIG. and explain the software.

Steps 40 to 46 are similar to the first embodiment except that steps 130 to 132 are inserted. Therefore, only these steps 130 to 132 will be explained. The engine rotation speed Ne is inputted from the rotation speed detector 80. In the next step 131, the set value Ni (corresponding to, for example, 200Or, p, m) stored in advance in the memory ROM is read out. Then, in the next step 132, the rotation speed Ne detected in step 130 is changed to the set value N set in step 131.
It is determined whether or not it is smaller than 1. If Ne<Nl, the process proceeds to step 44, while if Ne≧Nl, the process proceeds to step 46. Therefore, step 42 and step 131 result in the level setting means 5 shown in FIG.
0' and step 43 and step 132 constitute the determination means 60' shown in FIG. 2, and as shown in FIG. Rotation speed Ne is Ne, < N 1
If the detected temperature Tc is Tc≧TI and the detected rotation speed Ne belongs to the second temperature-rotation speed level of the Ne hole N1, the control system is set to the normal control system. By selecting the respective control systems, it is possible to perform control for more appropriate compressor protection as in the second embodiment.

18 and 19, a tenth embodiment of the present invention is shown, which combines the ninth embodiment with the third embodiment (see FIG. 9). The steps 41 and 131 are similar to the ninth embodiment in that the detected temperature Tc and detected rotational speed Ne are input, but in the next step 140,
Setting values Tt, T2 . Nll Read N2. The set value T1 is, for example, 140°C, the set value 7rz is, for example, 160°C, and the set value N1 is, for example, 2000r, p.
, n+, and the set value N2 corresponds to, for example, 3000r, p, m&, respectively, and the temperature-rotational speed level is set in three levels by upper and lower of these set values. Then, in the next step 141, it is determined whether Tc≧T2 and Ne above N2. If YES, the process proceeds to step 103; if NO, the process proceeds to step 142, and it is determined whether Tc≧T1 and Ne≧Nl. If Yes, the process proceeds to step 46, and if No, the process proceeds to step 44. That is. Step 1
41°142, the three temperatures as shown in Figure 19 -
If it is determined that the detected temperature Tc belongs to the first temperature-rotation speed level where Te<Tt or the detected rotation speed Ne belongs to the first temperature-rotation speed level where N"e<N+, steps 44 and 45 , 104 is performed when the detected temperature TC is Tc≧T2 and the detected rotational speed Ne is Ne above N2.
Step 1 if it belongs to the third temperature-speed level of
The stop control system indicated by 03 is controlled at a second temperature between the first temperature-rotation speed level and the third temperature-rotation speed level.
If it belongs to the rotational speed level, the general limit control system shown in step 46 104 is selected.

In FIG. 20, an eleventh embodiment of the present invention is shown,
This eleventh embodiment can be considered as a combination of the ninth embodiment and the fifth embodiment (see FIG. 12), and instead of the general limit control system in the ninth embodiment. It incorporates a special restriction control system, and steps 42° 131 and 43° 132 in FIG. 16 are summarized as step 150 and step 151, respectively. Other points are explained in the section of the fifth embodiment. Since those skilled in the art can easily understand by referring to , the same steps will be given the same number and their explanation will be omitted.

In FIG. 21 a twelfth embodiment of the invention is shown,
This twelfth embodiment is the same as the sixth embodiment in addition to the tenth embodiment.
It is considered to be a combination of the embodiments (see Fig. 14),
For the same reason as in the eleventh embodiment, the same steps are given the same numbers and their explanations will be omitted.

(Effects) As described above, according to the present invention, even if the temperature of the compressor reaches a predetermined temperature or higher, the drive of the compressor is not immediately stopped, but the pulley ratio is controlled to drive the compressor within a safe range. This not only prevents the compressor from seizing up, but also minimizes problems caused by stopping the compressor, such as a sudden rise in the cabin temperature or a decrease in braking force. It is something.

[Brief explanation of the drawing]

FIG. 1 is a block diagram according to the first invention of the present invention, FIG. 2 is a block diagram according to the second invention same as above, and FIGS. 3 to 5 show the first embodiment of the present invention, 3 is a configuration diagram, FIG. 4 is a sectional view of the belt transmission device used in the above, FIG. 5 is a flowchart, and FIGS. 6 to 8 show a second embodiment of the present invention. , FIG. 6 is a configuration diagram, FIG. 7 is a flowchart diagram, FIG. 8 is a relationship diagram for determining the set temperature T1, FIG. 9 is a flowchart diagram showing a third embodiment of the present invention, and FIG. 10 and 11 show a fourth embodiment of the present invention, in which FIG. 10 is a flowchart and FIG. 11 is a flow chart of the film temperature T1. FIG. 12 is a relationship diagram for determining Tz, and FIG. 12 is a flow chart diagram showing the fifth embodiment of the present invention.
14 is a flowchart showing a seventh embodiment of the invention, FIG. 15 is a flowchart showing an eighth embodiment of the invention, and FIG. 16 and 17 show a ninth embodiment of the present invention, FIG. 16 is a flowchart, and FIG. 17 is a temperature
18 and 19 show a tenth embodiment of the present invention, FIG. 18 is a flowchart diagram, and FIG. 19 is a diagram showing temperature-rotation speed level. FIG. 20 is a flowchart 1 showing the eleventh embodiment of the invention, and FIG. 21 is a flowchart showing the twelfth embodiment of the invention. 1. Engine, 2. Compressor, 3. Belt transmission device, 8. Pulley ratio conversion mechanism, 9. Electromagnetic clutch, 29. Temperature detector, 50.50'
... Level setting means 7, 60.60'... Judgment means, 70... Control means, 80... Rotation speed detector. Patent applicant: Diesel Equipment Co., Ltd. Figure 3 Figure 4 Figure 17 Figure 19 [Tc]

Claims (1)

[Scope of Claims] 1. The engine and the compressor are connected via a belt transmission device, and the belt transmission device includes a pulley ratio conversion mechanism that converts the pulley ratio and an intermittent transmission of driving force from the engine to the compressor. A compressor control device for an automotive air conditioner, comprising: a temperature detector for detecting the temperature of the compressor; a level setting means for setting a temperature level; and a level setting means for detecting humidity detected from the temperature sensor. a determination means for determining which temperature level the belt transmission device belongs to, and a control system is selected according to the determination result of the determination means, and in each control system, the pulley ratio of the belt transmission device is determined based on a predetermined input signal. 1. A compressor control device for an automobile air conditioner, comprising a conversion mechanism and a control means for controlling an electromagnetic clutch. 2. The compressor control device for an air conditioner for an automobile as set forth in claim 1, wherein the level setting means sets the temperature level to be above and below a pre-stored set value. 3. The scope of claims characterized in that the level determination means calculates a set value based on the output of a rotation detector that detects the number of revolutions of the engine, and defines the temperature level above and below the calculated set value. 2. A compressor control device for an automotive air conditioner according to item 1. 4. When the detected temperature belongs to a first temperature level below a predetermined temperature, the control means controls a normal control system that allows free control of the pulley ratio, and when the detected temperature belongs to a second temperature level above a predetermined temperature. In this case, the pulley ratio selects a general limit control system that prohibits the rotation of the compressor from shifting to a high speed side.
A compressor control device for an automotive air conditioner according to item 1 or 3. 5. The control means controls the first
If the detected temperature belongs to a temperature level of If the temperature is within the range, the pulley ratio will set up a general limit control system that prohibits the compressor rotation from shifting to the high speed side.
If the detected temperature belongs to a third temperature level that is equal to or higher than the second predetermined temperature, a stop control system that stops driving the compressor is selected, respectively. 4. A compressor control device for an automotive air conditioner according to item 3. 6. Even if the detected temperature belongs to a first temperature level below a predetermined temperature, or even when the detected temperature belongs to a second temperature level above a predetermined temperature, when the compressor is being driven, , the normal control system that allows free control of the pulley ratio is changed from the stopped state to the driven state when the detected temperature belongs to the second temperature level above the predetermined temperature and the compressor is stopped. Claim 1, characterized in that the pulley ratio prohibits the rotation of the compressor from shifting to the high-speed side until a predetermined time has elapsed.
A compressor control device for an air conditioner for an automobile according to item 1, 2 or 3. 7. The control means controls the first
or when the detected temperature belongs to a second temperature level between the first predetermined temperature and a second predetermined temperature higher than the first predetermined temperature and the compressor is not driven. If the compressor is in the second temperature level and the compressor drive is stopped, the normal control system that allows free control of the pulley ratio is activated after the compressor moves from the stop state to the drive state. When the detected temperature reaches the second
Claims 1, 2, or 3, wherein a stop control system is selected to stop driving the compressor if the compressor belongs to a third temperature level that is higher than a predetermined temperature. Compressor control device for automotive air conditioners. 8. The engine and the compressor are connected via a belt transmission device, and the belt transmission device includes a pulley ratio conversion mechanism that converts the pulley ratio, and an electromagnetic clutch that connects and disconnects the transmission of driving force from the engine to the compressor. A compressor control device for an automotive air conditioner, comprising: a temperature detector for detecting the temperature of the compressor; a rotation speed detector for detecting the rotation speed of the engine; a level setting means for setting a number of levels; a determining means for determining which temperature/rotational speed level the detected temperature and detected rotational speed from the temperature detector and the rotation detector belong to; and a determination result of the determining means. An automobile characterized in that it is provided with a control means for selecting a control system according to the above, and controlling a pulley ratio conversion mechanism and an electromagnetic clutch of the bell 1 transmission device in each control system based on a predetermined input signal. Compressor control device for air conditioners. 9. If the detected temperature is below a predetermined temperature or the detected rotational speed is below a predetermined rotational speed and belongs to the first temperature-speed level, the control means allows free control of the pulley ratio and controls the normal control system to control the detected temperature. is higher than a predetermined temperature and the detected rotational speed belongs to a second temperature-same rotational speed level that is higher than a predetermined rotational speed, the pulley ratio sets a general limit control system that prohibits the rotation of the compressor from shifting to the high speed side. 9. The compressor control device for an air conditioner for an automobile according to claim 8, wherein each of the compressor control devices is selected. 10. The control means allows free control of the boolean ratio when the detected temperature is below the first predetermined temperature or when the detected rotational speed belongs to a first temperature-1 rotational speed level that is below the first predetermined rotational speed. The normal control system is connected to a second predetermined temperature whose detected temperature is higher than the first predetermined temperature.
If the temperature is higher than the predetermined temperature and the detected rotation speed is in a third temperature rotation speed level that is higher than the second predetermined rotation speed, the detection control system detects The temperature and the detected rotation speed are between the first temperature and one rotation speed level and the third temperature and one rotation speed level.
Claim 8, characterized in that when the compressor falls within the second temperature/rotation speed level, a general limit control system is selected in which the pulley ratio prohibits the rotation of the compressor from shifting to a high speed side. A compressor control device for an automatic military air conditioner as described in Section 1. 11. When the detected temperature belongs to the first temperature-rotational speed level where the detected temperature is below a predetermined temperature or the detected rotational speed is below the predetermined rotational speed, or when the detected temperature is above the predetermined temperature and the detected rotational speed is the predetermined rotational speed. When the compressor is being driven even at the above second temperature-rotational speed level, the normal control system that allows free control of the pulley ratio is used, even if it belongs to the second temperature-rotational speed level. When the rotation of the compressor is stopped, a special restriction control system is selected that prohibits the pulley ratio from shifting the rotation of the compressor to the high speed side until a predetermined time has elapsed since the compressor moved from the stopped state to the driven state. A compressor control device for an automobile air conditioner according to claim 8. 12. The control means controls a first temperature at which the detected temperature is below a first predetermined temperature or the detected rotational speed is below a first predetermined rotational speed.
If it belongs to the rotation speed level, or the second temperature below -
When the compressor is being driven even if it belongs to the rotational speed level, the normal control system that allows free control of the pulley ratio is activated. and the detected rotation speed belongs to a third temperature-rotation speed level that is higher than the second predetermined temperature, which is higher than the first predetermined rotation speed, the stop control system that stops driving the compressor is set to the detected temperature and the detected rotation speed. number belongs to a second temperature-rotational speed level between the first temperature-rotational speed level and the third temperature-rotational speed level, and when the compressor is stopped, the compressor Claim 8, characterized in that a special restriction control system is selected in which the pulley ratio prohibits the rotation of the compressor from shifting to a high speed side until a predetermined period of time has elapsed after the compressor moves from a stopped state to a driven state. A compressor control device for an automotive air conditioner as described above.