JPH07110166A - Compressor controller of air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To prevent an air-conditioning from deteriorating because of the quiescent operation of a motor-driven compressor. CONSTITUTION:When a motor-driven compressor 1 is controlled so that it enters stop from operating state, the revolution number of the motor-driven compressor 1 when it is controlled to stop is detected by a quiescent time-setting device 3 and the quiescent time of the motor-driven compressor 1 is set corresponding to the detected revolution number. The quiescent time is short when the revolution number is low, and the higher the revolution number, the longer the quiescent time is set. The motor-driven compressor 1 is prohibited to start during the set time, and allowed to be started after the quiescent time elapses.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air-conditioning compressor controller, and more particularly to a device for controlling a motor-driven compressor.

[0002]

2. Description of the Related Art As a compressor for a vehicle air conditioner, there is one that uses a motor-driven compressor as described in, for example, Japanese Patent Laid-Open No. 63-57316. In a vehicle air conditioner that uses a motor-driven compressor, when the compressor is driven, if there is a large difference between the discharge pressure and the suction pressure of the compressor, that is, if the motor load is large, the compressor cannot be started. A fixed stop time is provided in the on / off control of the compressor. Since this stop time is set on the basis of the case where the motor load is large, it is generally set to about 3 minutes. Therefore, in this type of conventional air conditioner, when the drive of the compressor is stopped,
The compressor could not be restarted until such a fixed stop time had elapsed.

[0003]

In such a conventional air conditioner, when the compressor is stopped, it is always 3
The compressor cannot be restarted until a fixed time of about a minute has passed, so that the air conditioning feeling is extremely deteriorated in the case of air conditioning in the vehicle compartment where the temperature changes greatly.

The present invention has been made based on the above viewpoint, and an object thereof is to provide a vehicle air-conditioning compressor control device which is effective in preventing deterioration of air-conditioning feeling due to stop time of a motor-driven compressor. .

[0005]

In the present invention, FIG.
As shown in FIG. 3, in a vehicle air conditioner having a motor drive compressor 1 and a drive / stop control means 2 for controlling the drive / stop of the motor drive compressor 1 in response to an external signal, the drive / stop control means In response to 2,
The rotation speed of the motor drive compressor 1 when the motor drive compressor 1 is stop-controlled from the driving state is detected as the rotation speed during stop control, and the stop time of the motor drive compressor 1 is determined according to the rotation speed during stop control. A stop time setting means 3 for setting the stop time when the rotation speed during stop control is low, and shortens the stop time when the rotation speed during stop control increases, and the stop time which increases as the rotation speed during stop control increases. In response to the time setting means 3 and the stop time setting means 3, the start of the motor driven compressor 1 is prohibited during the stop time set by the stop time setting means 3, and after that, the motor driven compressor 1 is stopped. The drive / stop control means 2 so as to allow start-up.
The above object is achieved by a vehicle air conditioning compressor control device having a start control means 4 for controlling the.

In the configuration shown in FIG. 1, the stop time setting means 3 determines the above-mentioned operation based on the refrigerant discharge temperature or torque or power consumption of the motor-driven compressor 1 when the motor-driven compressor 1 is stop-controlled from the driving state. The stop time may be corrected and set as the stop time.

Further, in the present invention, as shown in FIG. 2, a motor drive compressor 5 and a drive / stop control means 6 for controlling the drive / stop of the motor drive compressor 5 in response to an external signal are provided. In a vehicle air conditioner, in response to the drive / stop control means 6, the electric power applied to the motor-driven compressor 5 when the motor-driven compressor 5 is stop-controlled from a driving state is detected as an electric power applied during stop control. The stop time setting means 7 sets the stop time of the motor-driven compressor 5 according to the power applied during the stop control, and shortens the stop time set when the power applied during the stop control is small. The stop time setting means 7 for increasing the stop time set as the applied power during the stop control increases, and the stop time setting means 7 And prohibits the activation of the motor driving the compressor 5 between the stop time setting stop time given from the means, the motor driving the compressor 5 in that elapsed
The above object is achieved by a vehicle air-conditioning compressor control device having a start control means 8 for controlling the drive / stop control means 6 so as to allow the start of.

[0008]

In the configuration of FIG. 1, when the drive / stop control means 2 controls the motor drive compressor 1 to stop from the driving state, the stop time setting means 3 stops the rotation speed of the motor drive compressor 1 at the time of stop control. It is detected as the control rotation speed, and the stop time of the motor-driven compressor 1 is set according to the stop control rotation speed. Stop time setting means 3
Sets a short stop time if the rotation speed during stop control is low, and sets a long stop time as the rotation speed during stop control increases. The start-up control means 4 inhibits the start-up of the motor-driven compressor 1 during the stop time set by the stop-time setting means 3, and allows the start-up of the motor-driven compressor 1 after that time. To control. Since the rotation speed during stop control correlates with the difference between the discharge pressure and the suction pressure when the compressor is stopped, setting the stop time according to the rotation speed during stop control makes it suitable for the pressure difference when the compressor is stopped. When the compressor rotation speed is low, such as during defrost control, compared to the conventional one, which can set a different stop time and gives a constant stop time determined based on a large pressure difference. Therefore, the stop time is shortened, and the feeling of air conditioning in the vehicle interior can be improved. When the stop time is corrected based on the refrigerant discharge temperature, the torque, or the power consumption, these also correlate with the pressure difference when the compressor is stopped, so a more appropriate stop time can be set. it can.

In the configuration of FIG. 2, when the drive / stop control means 6 controls the motor drive compressor 5 to stop from the driving state, the stop time setting means 7 controls the power applied to the motor drive compressor 5 at the time of stop control. It is detected as the applied power during stop control, and the stop time of the motor-driven compressor 5 is set according to the applied power during stop control. The stop time setting means 7 sets a short stop time if the applied power during stop control is small, and sets a long stop time as the applied power during stop control increases. The start-up control means 8 prohibits the motor-driven compressor 5 from starting during the stop time set by the stop-time setting means 7, and allows the start-up of the motor-driven compressor 5 after that time. To control. The power applied during stop control correlates with the difference between the discharge pressure and suction pressure when the compressor is stopped.Therefore, by setting the stop time according to the applied power during stop control, it is possible to adjust the pressure according to the pressure difference when the compressor is stopped. The stop time can be set, and the same effect as the configuration of FIG. 1 can be obtained.

[0010]

FIG. 3 is a block diagram showing the first embodiment of the present invention.

In FIG. 3, reference numeral 10 denotes a duct of an air conditioning system for a vehicle, in which a blower 11 and an indoor heat exchanger 12 are provided downstream thereof. At the uppermost stream of the duct 10, an intake door 13 for selecting the introduction of inside and outside air is provided, and the air taken in through the intake door 13 passes through the blower 11 and the indoor heat exchanger 12,
The air is blown as conditioned air to a blowout port (not shown) provided on the most downstream side. The indoor heat exchanger 12 constitutes a heat pump cycle together with the motor-driven compressor 14, the electric four-way valve 15 and the outdoor heat exchanger 16. The motor-driven compressor 14 has a discharge side connected to the electric four-way valve 15 via a refrigerant conduit 18 having an oil separator 17, and a suction side connected to the electric four-way valve 15 via a refrigerant conduit 20 having an accumulator 19. The electric four-way valve 15 is also connected to the outdoor heat exchanger 16 via a refrigerant conduit 21 and also has a refrigerant conduit 22.
It is connected to the indoor heat exchanger 12 via. The indoor heat exchanger 12 and the outdoor heat exchanger 16 are connected via a refrigerant conduit 24 having an orifice 23. In such a heat pump cycle, when the electric four-way valve 15 is indicated by a solid line, the motor-driven compressor 14 to the electric four-way valve 15, the outdoor heat exchanger 16, the indoor heat exchanger 12,
When the cooling operation is performed by forming a cooling path that returns to the motor-driven compressor 14 via the electric four-way valve 15, and the electric four-way valve 15 is indicated by a broken line, the motor-driven compressor 14 to the electric four-way valve 15 and the indoor heat exchanger. A refrigerant path returning to the motor-driven compressor 14 via the 12, the outdoor heat exchanger 16, the electric four-way valve 15 is formed, and the heating operation is performed. The motor drive compressor 14 is under the control of a control unit 26 via a compressor drive circuit 25.

Reference numeral 27 is a rotation speed sensor for detecting the rotation speed N of the motor drive compressor 14, and supplies the rotation speed of the motor drive compressor 14 to the control unit 26.
A duct sensor 28 is provided on the outlet side of the indoor heat exchanger 12 and has an outlet air temperature T _{e of the} indoor heat exchanger 12.
To the control unit 26. The control unit 26 further includes air conditioner switch information indicating ON / OFF of the air conditioner, blower switch information indicating ON / OFF of the blower 11, ignition switch information indicating ON / OFF of the ignition switch, and setting of the motor-driven compressor 14. Compressor rotation speed setting value information indicating the rotation speed is provided.

The control unit 26 is shown in FIGS.
And according to the flowchart of FIG. 6, the drive / driving of the motor drive compressor 14 is performed based on the air conditioner switch information, the blower switch information, and the ignition switch information.
The function of controlling the stop, the function of controlling the motor-driven compressor 14 to reach the set speed based on the compressor speed setting value information, and the motor-driven compressor 14 based on the outlet side air temperature T _e of the duct sensor 28. Of the motor-driven compressor 14 when the outlet side air temperature T _e becomes lower than a predetermined temperature. Control unit 26
Further, according to the flowcharts of FIGS. 4, 5 and 6, when the motor-driven compressor 14 is stop-controlled from the driving state, the motor-driven compressor 1 at that time is controlled.
4 is taken in and recognized as the rotation speed during stop control, and the stop time T of the motor-driven compressor 14 is determined according to the stop time setting map showing the relationship between the stop time T and the rotation speed during stop control in FIG. Set and set stop time T
During this period, the motor-driven compressor 14 is prohibited from starting, and has a function of permitting starting in that time. Since the rotation speed during stop control has a correlation with the pressure difference between the discharge pressure and the suction pressure when the compressor is stopped, by setting the stop time T according to the rotation speed during stop control, the stop according to the pressure difference can be achieved. Time T is given.

4, 5 and 6 are flow charts of the control unit of FIG. 3, wherein terminals c and d of FIG. 5 are connected to terminals of the same reference numeral of FIG. 4, and terminals a and b of FIG.
And the terminals with the same reference numerals in FIG. Below, FIG.
The operation of the configuration of FIG. 3 will be described with reference to FIG.

The control unit 26 is first shown in FIG.
In step 30 of, it is determined whether the flag F is set to "1". As will be described later, the flag F is set to "1" when the motor-driven compressor 14 is stop-controlled from the driving state, and is reset to "0" when the stop time T elapses. The flag F is in a reset state at the beginning of the start. The control unit 26 proceeds to step 31 following step 30 to determine whether the ignition switch is on / off, step 32 to determine whether the blower switch is on / off, or step 33 to determine whether the air conditioner switch is on / off. Where the ignition switch,
Assuming that the blower switch and the air conditioner switch are all on, the control unit 26 proceeds to step 34.
After the driving process of the motor-driven compressor 14 is performed, step 35 is entered. In step 35, the outlet side air temperature T _e is taken in from the duct sensor 28, and it is determined which of the outlet side air temperature regions A, B, C, D the taken outlet side air temperature T _e belongs to. Outlet side air temperature range A, B, C,
D becomes a low temperature region as region A becomes a high temperature region and regions B, C and D become, and region D becomes the motor drive compressor 14
Has become a stop area. Here, the outlet side air temperature T _e
, Which belongs to any one of the areas A, B, and C, the control unit 26 designates the rotational speed control map of the motor-driven compressor 14 in step 36 and steps 37 and 38 of FIG. 5 according to the determination of step 35. To do. The rotational speed control map is of three types, Hi, Me, and Lo, as shown in step 42 described later, and when the outlet side air temperature T _e belongs to the region A, it is Hi in step 39.
Is specified, and if T _e belongs to area B, step 40
Specifies Me, and if T _e belongs to region C, Lo is specified in step 41. Control unit 26
In step 42 after designating the rotation speed control map, the rotation speed of the motor-driven compressor 14 is controlled according to the designated rotation speed control map in accordance with the compressor rotation speed set value information. Next, in step 43, the rotation speed N of the motor drive compressor 14 is set to N> so that the motor drive compressor 14 does not fall below the minimum stable rotation speed.
Whether 1500 rpm or N ≦ 1500 rpm is judged, N
If ≦ 1500 rpm, the rotation speed is 15 in step 44.
After controlling the speed to be 00 rpm, step 30 in FIG.
Then, if N> 1500 rpm, step 3 immediately.
Return to 0.

When at least one of the ignition switch, the blower switch, and the air conditioner switch is turned off while the motor-driven compressor 14 is being driven by such control, the control unit 26 causes the control unit 26 to start from any one of steps 31 to 33. Enter step 45,
In step 45, the motor-driven compressor 14 is stopped and controlled, and step 46 in FIG. 6 is entered. In step 46, it is determined whether or not the motor-driven compressor 14 has been stop-controlled from the driving state, and the stop-control is performed from the driving state to enter step 47. The control unit 26 takes in the rotation speed of the motor-driven compressor 14 when the stop control is performed from the drive state in step 47 from the rotation speed sensor 27, recognizes this as the rotation speed during stop control, and then stops in the next step 48. Set time T. The stop time T is set according to the stop time setting map of FIG. 7, and as is clear from FIG. 7, the stop time T is set longer as the rotation speed during stop control increases. The control unit 26 goes to step 49 after step 48, sets the flag F to "1", starts an internal timer to regulate the stop time, and goes to the next step 50. In step 50, it is determined whether or not the stop time T set in step 48 has elapsed. Where the stop time T is still
Is not elapsed, the control unit 26
Returns from step 50 to step 30 in FIG. 4 and the flag F is "1" so that the step 50 starts again from step 30 and during the stop time T, regardless of the operation of the ignition switch, the blower switch and the air conditioner switch. The start of the motor-driven compressor 14 is prohibited. When the stop time T has elapsed, the control unit 2
6 goes from step 50 to step 51 and the flag F
Is reset to "0" to release the stop of the motor-driven compressor 14, and the internal timer is reset to enter step 30 in FIG. 4 to allow the motor-driven compressor 14 to start.

Outlet side air temperature T from the duct sensor 28
_{If e} is determined to be area D in step 35, the control unit 26 proceeds from step 38 to step 5
2 through the stop control of the motor-driven compressor 14 of FIG.
In step 46, the start of the motor-driven compressor 14 is prohibited during the stop time T by the above-described control, and the start is permitted after that time.

If at least one of the ignition switch, the blower switch and the air conditioner switch remains in the off state under the condition that the stop time T has elapsed and the flag F is reset to "0", the steps 31 to 31 are executed.
From 33 to step 45 and then to step 46, and since the motor-driven compressor 14 is still in the stopped state, the routine goes from step 46 to step 53, through compressor stop control, and then returns to step 30.

FIG. 8 is a block diagram showing a second embodiment of the present invention. In addition to the configuration of the first embodiment, a discharge temperature sensor 60 for detecting the refrigerant discharge temperature T _d of the motor driven compressor 14 is provided in the refrigerant conduit 18. The discharge temperature T _d from the discharge temperature sensor 60 is provided to the control unit 61. The control unit 61 is the first
When the motor-driven compressor 14 is controlled according to the flowchart of FIG. 4 and FIG. 5 of the embodiment and the motor-driven compressor 14 is stopped from the driving state according to the flowchart of FIG. Stop time T using the stop time setting map of
Further, the stop time correction value ΔT is calculated based on the refrigerant discharge temperature T _d from the discharge temperature sensor 60 using the stop time correction map of FIG. 10, and the stop time T is corrected by the stop time correction value ΔT. It has a function of setting the stop time T ₀ . Other configurations are as described in the first embodiment.

FIG. 9 is a flow chart of the control unit of FIG. 8, which is connected to terminals a and b of the same reference numerals of FIGS. 4 and 5 instead of FIG. In FIG. 9, when the motor-driven compressor 14 is stopped from the driving state, the control unit 61 causes the step 62 to step 6
3, the rotation speed at the time of stop control of the motor-driven compressor 14 is recognized as described in the first embodiment, the stop time T is obtained using the map for setting the stop time in FIG. 7, and the next step 64 is entered. In step 64, the discharge temperature sensor 6
The refrigerant discharge temperature T _d is taken in from 0, and the stop time correction value ΔT is obtained using the stop time correction map of FIG. 10. Figure 1
As is clear from 0, a larger stop time correction value ΔT is given as the refrigerant discharge temperature T _d increases. In the next step 65, the control unit 61 obtains the corrected stop time T ₀ by adding the stop time correction value ΔT to the stop time T, and sets this as the stop time. Since the refrigerant discharge temperature T _d has a correlation with the difference between the suction pressure and the protrusion pressure of the compressor, the stop time can be set more appropriately by correcting the stop time T according to T _d . The control unit 61 proceeds to step 66 after step 65, sets the flag F to "1" and starts the internal timer, and in the next step 67, determines whether or not the stop time T ₀ has elapsed. If it has not elapsed, the routine returns from step 67 to step 30 in FIG. 4, and if it has elapsed, the routine returns to step 30 in FIG. 6 after resetting the flag F, releasing the compressor stop and resetting the internal timer. Other operations are as described in the first embodiment.

In the second embodiment, the motor-driven compressor 1
Refrigerant discharge temperature T _d when 4 is stopped from the driving state
Although the stop time T is corrected based on the above, instead of this, the stop time T is corrected based on the power consumption or torque of the motor-driven compressor 14 when the motor-driven compressor 14 is stop-controlled from the driving state. You may do it. When correcting with power consumption, a stop time correction map as shown in FIG. 10 showing the relationship between power consumption and the stop time correction value is provided, and the control unit 61 controls the motor drive compressor 14 via the compressor drive circuit 25. A map for stop time correction, which monitors the power consumption, detects the power consumption of the motor drive compressor 14 when the motor drive compressor 14 is stop-controlled from the driving state, and represents the relationship between the power consumption and the stop time correction value. The stop time correction value may be obtained using.
In the case of correction by torque, a stop time correction map showing the relationship between the torque and the stop time correction value is provided, and the control unit 61 monitors the power consumption and rotation speed of the motor driven compressor 14 via the compressor drive circuit 25. In order to correct the stop time, the torque is calculated from the power consumption and the rotation speed of the motor drive compressor 14 when the motor drive compressor 14 is stopped from the driving state. The stop time correction value may be obtained using a map.
Since the power consumption and the torque also have a correlation with the difference between the suction pressure and the protrusion pressure of the compressor similarly to the refrigerant discharge temperature T _d , the stop time T is corrected according to the power consumption or the torque, so that the stop time can be more appropriately adjusted. Can be set.

FIG. 11 is a block diagram showing the third embodiment of the present invention.

In FIG. 11, reference numeral 70 denotes a duct for an air conditioner for a vehicle, in which a blower 71, an evaporator 72 downstream of the blower 71, and a heater core 73 downstream of the evaporator 72 are arranged. An intake door 74 for switching between the inside air and the outside air is provided in the uppermost stream of the duct 70, and the air taken in through the intake door 74 is blown downstream through the blower 11 and between the evaporator 72 and the heater core 73. Air is blown as conditioned air to a blowout port (not shown) provided at the most downstream side through an air mix door 75 provided at the.
The evaporator 72 constitutes a cooling cycle together with the motor driving compressor 76, the condenser 77, the receiver tank 78 and the expansion valve 79. The motor drive compressor 76 is under the control of a compressor control circuit 81 via a compressor drive circuit 80. A rotation speed sensor 82 detects the rotation speed of the motor drive compressor 76, and supplies the rotation speed of the motor drive compressor 76 to the compressor control circuit 81. The compressor control circuit 81 is further supplied with compressor rotation speed set value information indicating the set rotation speed of the motor-driven compressor 76, and a compressor on / off signal from the compressor on / off instruction circuit 83. It is designed to be used. Reference numeral 84 denotes a duct sensor, which is provided on the outlet side of the evaporator 72.
Compressor on / off instruction circuit 8 for the outlet side air temperature
Give to 3. Further, the compressor on / off instruction circuit 83 is provided with air conditioner switch information indicating on / off of the air conditioner switch, blower switch information indicating on / off of the blower 71, and ignition switch information indicating on / off of the ignition switch. It is like this.

The compressor on / off instruction circuit 83 is
When the air conditioner switch, the blower switch and the ignition switch are all on and the outlet side air temperature from the duct sensor 84 is equal to or higher than a predetermined temperature, a compressor on signal is given to the compressor control circuit 81 and at least one is turned off. , The duct sensor 84
It has a function of giving a compressor-off signal when the temperature of the air on the outlet side from the engine becomes lower than a predetermined temperature. The compressor control circuit 81 duty-controls the motor-driven compressor 76 according to the flowcharts of FIGS. 12 and 13 so that the motor-driven compressor 76 has a set rotation speed based on the compressor rotation-speed setting value information, and drives the motor-drive compressor 76. When the stop control is performed from the state, the duty ratio of the drive signal to the motor drive compressor 76 at that time is recognized, and the stop time T of the motor drive compressor 76 is set based on the recognized duty ratio. It has a function of prohibiting the startup of the inter-motor drive compressor 76 and permitting the startup after that. The duty ratio of the drive signal applied to the motor-driven compressor 76, that is, the applied power has a correlation with the pressure difference between the discharge pressure and the suction pressure when the compressor is stopped. Therefore, by setting the stop time T accordingly, The stop time T corresponding to the difference is given.

12 and 13 are flowcharts of the compressor control circuit of FIG. 11, and terminals e and f of FIG. 13 are connected to terminals of the same reference numeral of FIG. The operation of the configuration of FIG. 11 will be described below with reference to FIGS. 12 and 13.

When the compressor on signal is given from the compressor on / off instruction circuit 83, the compressor control circuit 81 goes through step 90 and then step 9
When the flag F is set to 1, it is determined whether or not the flag F is set to "1". As will be described later, the flag F is set to "1" when the motor-driven compressor 76 is stop-controlled from the driving state, and is reset to "0" when the stop time T elapses. Here, it is assumed that it is in the reset state. The compressor control circuit 81 goes from step 91 to step 92, and after the driving process of the motor driving compressor 76 in step 92, in step 93 the difference ΔN between the actual rotation speed N of the motor driving compressor 76 and the set rotation speed N _S = N-N _S is obtained, and in the next step 94, it is determined which of the rotation difference regions A, B, C the difference ΔN belongs to. In this example, the area A is a + difference area, the area B is an appropriate area, and the area C is
Is the difference area. When the difference ΔN belongs to the area A, −2% is set as the duty change α in step 95, and when the difference ΔN belongs to the area B, step 96.
Is set to 0%, and when the difference ΔN belongs to the region C, + 2% is set in step 97. Next, the compressor control circuit 81 enters step 98, calculates the new duty ratio by adding the set duty change amount α to the previous duty ratio, and in the next step 99, the motor drive compressor 76 according to the new duty ratio. Control processing is performed, and step 100 is entered. In step 100,
It is determined to which of the duty regions A, B and C the duty ratio of the drive signal currently given to the motor drive compressor 76 belongs. In this example, the area A is a high duty area, the area B is a middle duty area, and the area C is a low duty area. If the current duty ratio belongs to the area A, 3 minutes is set as the stop time T in step 101, and if it belongs to the area B, step 102 is set.
2 minutes is set with, and if it belongs to area C, step 10
Set 1 minute with 3. After that, the compressor control circuit 8
In step 104, it is determined whether or not the motor-driven compressor 76 has been stopped and controlled from the driving state.
Here, if the compressor off signal is not given from the compressor on / off instruction circuit 83, the compressor control circuit 81 returns from step 104 to step 90, and repeats the above control.

When a compressor off signal is given from the compressor on / off instruction circuit 83 while the motor driving compressor 76 is driven by such control, the compressor control circuit 81 goes from step 90 to step 105, After the stop process of the motor-driven compressor 76, step 104 is entered. The compressor control circuit 81 enters from step 104 to step 106 because the motor drive compressor 76 is stop-controlled from the driving state, sets the stop time T set in the previous step 101 or 102 or 103 in the internal timer, and then In step 107, the flag F is set to "1" and the internal timer is started, and step 90
Return to. Here, the compressor on / off instruction circuit 83
If it continues to give the compressor off signal, the compressor control circuit 81 goes through step 90 and step 105 to step 104, and since it is in the off state continuously, circulates the control loop returning from step 104 to step 90. To do. On the other hand, if the compressor on / off instruction circuit 83 gives a compressor on signal, the compressor control circuit 81 proceeds from step 90 to step 91, and since the flag F is set to "1", it proceeds to step 108. . In step 108, it is judged whether or not the stop time T has passed. If not, step 105 is entered to prohibit the start of the motor-driven compressor 76, and when it has passed, the flag F of step 109 is reset to "0". Then, the motor driven compressor 76 is allowed to start by entering step 92 after resetting the internal timer.

In the third embodiment, the stop time T is calculated based on the duty ratio of the drive signal of the motor drive compressor 76.
However, the motor drive compressor 76
Alternatively, the stop time T may be set by calculating the applied power by detecting the input current and voltage of the above.

[0029]

As described above, according to the present invention, the rotation speed of the motor-driven compressor or the electric power applied to the motor-driven compressor when the motor-driven compressor is stopped from the driving state is detected, and the detected rotation is detected. Since the motor drive compressor stop time is set according to the number or applied power, it is possible to set an appropriate stop time according to the pressure difference when the compressor is stopped. It is possible to improve the air-conditioning feeling in the vehicle compartment as compared with the conventional one in which a fixed stop time is provided. Further, since the stop time set according to the number of revolutions is further corrected according to the refrigerant discharge temperature or torque or the power consumption when the motor-driven compressor is stop-controlled from the driving state, it is more appropriate. It is possible to set different stop times.

[Brief description of drawings]

FIG. 1 is a block diagram of the present invention.

FIG. 2 is another block diagram of the present invention.

FIG. 3 is a configuration diagram showing a first embodiment of the present invention.

4 is a flowchart of the control unit of FIG.

5 is a flowchart of the control unit shown in FIG. 3, which is connected to the terminals having the same reference numerals in FIG.

6 is a flowchart of the control unit shown in FIG. 3, which is connected to the terminals having the same reference numerals in FIGS. 4 and 5;

7 is a stop time setting map showing the relationship between the stop time and the rotation speed during stop control stored in the control unit shown in FIG. 3;

FIG. 8 is a block diagram showing a second embodiment of the present invention.

9 is a flowchart of the control unit of FIG. 8, and is connected to the terminals of the same reference numerals of FIGS. 4 and 5 instead of the flowchart of FIG.

10 is a stop time correction map showing the relationship between the stop time correction value and the refrigerant discharge temperature stored in the control unit shown in FIG. 8;

FIG. 11 is a configuration diagram showing a third embodiment of the present invention.

FIG. 12 is a flowchart of the compressor control circuit of FIG.

FIG. 13 is a flowchart of the compressor control circuit of FIG. 11, which is connected to the terminal of the same reference numeral of FIG.

[Explanation of symbols]

 1 Motor Drive Compressor 2 Drive / Stop Means 3 Stop Time Setting Means 4 Start Control Means 5 Motor Drive Compressors 6 Start / Stop Control Means 7 Stop Time Setting Means 8 Start Control Means 14 Motor Drive Compressors 25 Compressor Drive Circuits 26 Control Units 27 Rotation Number sensor 60 Discharge temperature sensor 61 Control unit 76 Motor drive compressor 80 Compressor drive circuit 81 Compressor control circuit 82 Rotation speed sensor 83 Compressor on / off instruction circuit

Claims (3)

[Claims] 1. A vehicle air conditioner having a motor-driven compressor and drive / stop control means for controlling the drive / stop of the motor-driven compressor in response to an external signal. Then, the rotation speed of the motor drive compressor when the motor drive compressor is stop-controlled from the driving state is detected as the rotation speed during stop control, and the stop time of the motor drive compressor is determined according to the rotation speed during stop control. A stop time setting means for setting, wherein the stop time to be set is shortened when the rotation speed during stop control is low, and the stop time is set to be longer as the rotation speed during stop control increases. Means for responding to the stop time setting means, the motor drive controller during the stop time set by the stop time setting means. It prohibits the activation of suppressor, so as to permit activation of the motor driving the compressor at its course, compressor control system for a vehicle air conditioner and a start control means for controlling the drive / stop control unit. 2. The stop time setting means corrects the stop time based on a refrigerant discharge temperature or torque or power consumption of the motor drive compressor when the motor drive compressor is stop-controlled from a driving state. The vehicle air-conditioning compressor control device according to claim 1, wherein is set as the stop time. 3. A vehicle air conditioner having a motor-driven compressor and drive / stop control means for controlling the drive / stop of the motor-driven compressor in response to an external signal. Then, the power applied to the motor-driven compressor when the motor-driven compressor is stop-controlled from the driving state is detected as the power applied during the stop control, and the stop time of the motor-driven compressor is determined according to the power applied during the stop control. A stop time setting means for setting the stop time when the applied power during the stop control is small, and shortens the set stop time when the applied power during the stop control increases. Responsive to the stop time setting means, for the stop time given by the stop time setting means, It prohibits the start of driving the compressor, so as to permit activation of the motor driving the compressor at its course, compressor control system for a vehicle air conditioner and a start control means for controlling the drive / stop control unit.