JPH08142646A - Control device for air conditioning system - Google Patents

Abstract

PURPOSE: To prevent the simultaneous addition/removal of the torque fluctuation to/from the engine by deviating the connection timing of a magnet clutch from the rotation starting timing of a condenser fan, and deviating the rotation stopping timing of the magnet clutch by the prescribed period of time. CONSTITUTION: An evaporator 3 in which the cooled air flows takes the latent heat required for the evaporation of the refrigerant from the air in a cabin, and cools the air inside the cabin, and at the same time, evaporates the refrigerant to be sucked into a compressor 1. Connection of a magnet clutch 10 to the engine is deviated from the rotation starting timing of a condenser fan 5 by the prescribed period of time, and disconnection of the magnet clutch 10 from the engine is deviated from the rotation starting timing of the condenser fan 5 by the prescribed period of time. The torque fluctuation added/removed to/from the engine is reduced to mitigate the shock to the occupant.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the control of a magnet clutch and a condenser fan, which are components of a vehicle air conditioning system.

[0002]

2. Description of the Related Art In a conventional vehicle air conditioning system, a refrigeration cycle is formed, and a magnet clutch connects a compressor forming the refrigeration cycle and a vehicle engine to drive the compressor. On the other hand, the condenser fan cools the condenser forming the refrigeration cycle.

FIG. 19 is a diagram for explaining the torque that is not applied to the engine by the conventional air conditioning system. For example, the start switch of the air conditioning system simultaneously turns on or off the magnet clutch and the condenser fan as shown in FIGS. In this case, the torque of the compressor is directly applied to the engine or is lost as shown in FIG. Further, as shown in FIG. 3D, the torque of the condenser fan is added to the engine as the alternator torque or disappears as an alternator torque via the power generation amount of the alternator.

[0004]

However, in the conventional air conditioning system, the magnet clutch and the condenser fan are simultaneously turned on, and the compressor torque and alternator torque are simultaneously applied to the engine as shown in FIG. Therefore, there is a problem that the occupant feels a shock. Further, since the magnet clutch and the condenser fan are turned off at the same time, the torque of the compressor and the alternator torque disappear from the engine at the same time, as shown in FIG. 6 (e), which causes a problem that a passenger feels a shock.

Therefore, in view of the above problems, it is an object of the present invention to provide a control device for an air conditioning system that can reduce the torque fluctuations that are applied to or lost in the engine to reduce the shock to the occupants. To do.

[0006]

In order to solve the above problems, the present invention provides a control device for an air conditioning system having the following configuration. That is, the compressor and the vehicle engine are connected to a control device for a vehicle air conditioning system having a compressor, a condenser, and an evaporator according to the first aspect of the invention.
A magnetic clutch that disengages and a condenser fan that cools the condenser are provided. The control circuit shifts the connection timing of the magnet clutch and the rotation start timing of the condenser fan by a predetermined time, and correspondingly shifts the release timing of the magnet clutch and the rotation stop timing of the condenser fan by a predetermined time.

The control circuit sets either one of the connection timing of the magnet clutch or the rotation start timing of the condenser fan, and correspondingly one of the release timing of the magnet clutch or the rotation stop timing of the condenser fan. Alternatively, it may be determined based on the temperature of the outlet of the evaporator. The control circuit sets either one of the connection timing of the magnet clutch or the rotation start timing of the condenser fan, and correspondingly one of the release timing of the magnet clutch or the rotation stop timing of the condenser fan, and the evaporator. The temperature may be determined based on any one of the temperature of the outlet, the amount of solar radiation, the temperature inside the vehicle, the temperature outside the vehicle, and the cooling water temperature.

A controller for an air conditioning system for a vehicle having a compressor, a condenser and an evaporator according to a second aspect of the present invention, a magnet clutch for connecting and disconnecting the compressor and the vehicle engine, and a condenser fan for cooling the condenser. And an evaporator fan for cooling the evaporator. The control circuit mutually shifts the connection timing of the magnet clutch, the rotation start timing of the condenser fan, and the rotation start timing of the evaporator fan by a predetermined time, and correspondingly, the release timing of the magnet clutch and the rotation of the condenser fan. The stop time and the rotation stop time of the evaporator fan are mutually shifted by a predetermined time.

The control circuit sets one of the connection timing of the magnet clutch, the rotation start timing of the condenser fan, and the rotation start timing of the evaporator fan, corresponding to the release timing of the magnet clutch and the condenser fan. Either the rotation stop timing or the rotation stop timing of the evaporator fan may be determined based on the temperature of the outlet of the evaporator.

The control circuit sets one of the connection timing of the magnet clutch, the rotation start timing of the condenser fan, and the rotation start timing of the evaporator fan, corresponding to the release timing of the magnet clutch and the condenser fan. Rotation stop timing, either one of the rotation stop timing of the evaporator fan, the temperature of the outlet of the evaporator, the amount of solar radiation, the temperature inside the vehicle, the temperature outside the vehicle,
It may be determined based on any one of the cooling water temperatures.

The control circuit may set the predetermined time to about 2 seconds.

[0012]

According to the control device of the air conditioning system of the present invention, in the first aspect of the present invention, the connection timing of the magnet clutch and the rotation start timing of the condenser fan are shifted by a predetermined time so that the separation timing of the magnet clutch and the condenser. By shifting the rotation stop timing of the fan by a predetermined time, it is possible to prevent the torque fluctuations of the compressor and the alternator from being added to the engine at the same time, and to eliminate the torque fluctuations, thereby reducing the shock felt by the occupant. Either one of the connection timing of the magnet clutch or the rotation start timing of the condenser fan, corresponding to either the release timing of the magnet clutch or the rotation stop timing of the condenser fan, the temperature at the outlet of the evaporator Based on the above, the torque fluctuations of the compressor and alternator are added to the engine at the same time even in the automatic operation of the control device of the air conditioning system,
Avoiding disappearance and reducing the shock felt by passengers. Furthermore, either one of the connection timing of the magnet clutch or the rotation start timing of the condenser fan is
Correspondingly, either the disengagement timing of the magnetic clutch or the rotation stop timing of the condenser fan is determined based on one of the temperature of the outlet of the evaporator, the amount of solar radiation, the temperature inside the vehicle, the temperature outside the vehicle, and the cooling water temperature. By determining the above, it is possible to prevent the torque fluctuations of the compressor and the alternator from being added to the engine at the same time even when smoother automatic operation of the control device of the air conditioning system is performed, and to reduce the shock felt by the occupant.

In the second invention, an evaporator fan for cooling the evaporator is additionally provided.
In the same manner as in the invention described above, it is possible to prevent the torque fluctuations of the compressor and the plurality of alternators from being applied to the engine at the same time, and to prevent the torque fluctuations from disappearing to reduce the shock felt by the occupant. Furthermore, in the case of automatic operation as well as in the case of smoother automatic operation, torque fluctuations of the compressor and multiple alternators are added to the engine at the same time, avoiding disappearance,
Reduces the shock felt by passengers. Optimum control becomes possible by specifically setting the predetermined time to about 2 seconds.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing an air conditioning system according to a first embodiment of the present invention. As shown in this figure, a refrigeration cycle is formed in the air conditioning system by connecting the compressor 1, the condenser 2, the expansion valve 4, and the evaporator 3 via a refrigerant pipe. This compressor 1 is a magnet clutch 10
(See FIG. 2) through to the engine. Further, the condenser 2 is provided with a condenser fan 5 for cooling the condenser 2. The condenser fan 5 is driven by a condenser fan motor 6, and when the condenser fan motor 6 is turned on, the power generation amount of the alternator increases. Here, the compressor 1 draws in and compresses a gaseous refrigerant to form a high temperature / high pressure gas. The condenser 2 to which the high temperature / high pressure gas is sent out from the compressor 1 cools this high temperature / high pressure gas during passage and takes away the latent heat of condensation to liquefy. In this case, the condenser fan 5 is used for cooling the condenser 2, and the condenser fan 5 is driven by the condenser fan motor 6. The expansion valve 4 to which the liquid refrigerant is sent rapidly expands the liquid refrigerant to form a low-temperature, low-pressure mist-like refrigerant. Evaporator 3 into which this refrigerant flows
Takes the latent heat required for the refrigerant to evaporate from the air in the vehicle compartment, cools the air in the vehicle compartment, and at the same time is vaporized and taken into the compressor 1. The coupling of the magnet clutch 10 to the engine and the rotation start timing of the condenser fan 5 are shifted by a predetermined time t0, and further, the detachment of the magnet clutch 10 from the engine and the rotation stop timing of the condenser fan 5 are predetermined. The time t0 is shifted. The control circuit that shifts by the predetermined time t0 will be described below.

FIG. 2 is a diagram showing the control circuit 15 of the air conditioning system. Control circuit 15 shown in this figure
In, an air conditioner switch 7 for turning on or off the air conditioning system is provided. A magnet clutch relay 8 is connected to the air conditioner switch 7, and a magnet clutch 10 is connected via the magnet relay 8 so that the magnet clutch 10 is turned on or off at the same time as the air conditioner switch 7 is turned on or off. On the other hand, the air-conditioner switch 7 is connected with a delay circuit 11 that delays by the time t0.
The condenser fan relay 9 is connected via.

FIG. 3 is a diagram for explaining the switching timing of the magnet clutch 10 and the condenser fan 5 in detail. At the same time when the air conditioner switch 7 is turned on or off, the magnet clutch 10 is turned on or off via the magnet clutch relay 8 as shown in the figure.
On the other hand, the condenser fan 5 rotates or stops the condenser motor 6 via the condenser fan relay 9 after a predetermined time t0 after the air conditioner 7 is turned on or off by the delay circuit 11. In this way, the timing at which the magnet clutch 10 and the condenser fan 5 are turned on or off can be shifted by a predetermined time t0. As shown in the figure, the condenser fan motor 6 is rotated or stopped via the condenser fan relay 9 after a predetermined time t0 after the air conditioner switch 7 is turned on or off. In this way, the timing at which the magnet clutch 10 and the condenser fan 2 are turned on or off can be shifted by a predetermined time t0.

In the above example, the delay circuit 11 is connected to the condenser fan relay 9 side, but it may be connected to the magnet relay 8 side. As a result, the magnet clutch 10 can be turned on or off after a predetermined time t0 after the air conditioner switch 7 is turned on or off. FIG. 4 is a time chart for explaining reduction of torque fluctuations of the compressor and the alternator which are simultaneously added to the engine and disappear.

As shown in FIGS. 4 (a) and 4 (b), the switching time from OFF to ON of the magnet clutch 10 and the condenser fan 5 is deviated by a predetermined time t0 from ON to O.
The switching time to FF is shifted by a predetermined time t0. FIG.
As shown in (c) and (d), the compressor torque and the alternator torque are deviated by a predetermined time t0 due to the deviation of the predetermined time t0 regarding the magnet clutch 10 and the condenser fan 5. As shown in FIG. 4D, the torque applied to the engine is increased stepwise by turning on the air conditioner switch 7, and is decreased stepwise by turning it off. In this way, the timing at which the magnet clutch 10 and the condenser fan 5 are turned on or off is set to the predetermined time t.
By advancing or delaying by 0, it is possible to prevent the torque of the compressor 1 and the torque equivalent to the condenser fan of the alternator from being applied to the engine at the same time and disappearing. By sequentially turning on and off the loads forming the air conditioning system in this way, it is possible to smooth torque fluctuations and reduce shocks caused by simultaneous turning on and off of loads felt by an occupant. The predetermined time t0 is preferably about 2 seconds.

FIG. 5 is a diagram showing an air conditioning system according to a second embodiment of the present invention. Compared with the configuration of FIG. 1, the air conditioning system shown in this figure is provided with a post-evaporator temperature sensor 14 at the outlet of the evaporator 3. The post-evaporator temperature sensor 14 automatically controls ON / OFF switching of the air conditioning system. The timing of connecting and disconnecting the magnet clutch 10 and the condenser fan motor 6 in this automatic control will be described as follows.

FIG. 6 is a diagram showing the control circuit 15 of the air conditioning system of FIG. The control circuit 15 shown in the figure includes an input interface 16 connected to the air conditioner switch 7 and the evaporator post-temperature sensor 14.
A microcomputer 17 for processing a signal from the input interface 16 and an output interface 18 for inputting a signal generated by the microcomputer 17 and energizing and controlling the magnet clutch relay 8 and the condenser fan relay 9 are provided.

FIG. 7 is a flow chart for explaining the processing of the microcomputer 17 of FIG. In step S1, it is determined whether the air conditioner switch is ON. If this determination is "YES", the process proceeds to step S2, and if this determination is "NO", it waits until it becomes "YES".

In step S2, it is determined whether the post-evaporator temperature T has become equal to or higher than the reference temperature T0. The reference temperature T0 serves as a reference for determining whether to operate the air conditioning system. This judgment is "YES"
If so, the process proceeds to step S3. If "NO", the process proceeds to step S6. In step S3, the magnet clutch relay 8 is turned on.

In step S4, the timer is started by turning on the magnet clutch relay 8 and it is determined whether or not the elapsed time t is equal to or longer than the reference time t0.
This reference time is a time for biasing the magnet clutch relay 8 and the condenser fan relay 9 by shifting them. If this determination is "YES", the process proceeds to step S5 and "NO".
Then wait until it becomes "YES".

In step S5, the condenser fan relay 9 is turned on. In step S6, the magnet clutch relay 8 is turned off. In step S7, the timer is started by turning off the magnet clutch relay 8 and it is determined whether or not the elapsed time t is equal to or longer than the reference time t0. This reference time is a time for deactivating the magnet clutch relay 8 and the condenser fan relay 9 by shifting them. If this determination is "YES", the process proceeds to step S8, and if "NO", the process waits until "YES".

In step S8, the condenser fan relay 9 is turned off. According to the present embodiment, the air conditioning system is automatically controlled according to the post-evaporator temperature, but in this case as well, the load can be sequentially turned on or off, and the shock to the occupant due to torque fluctuations can be reduced. FIG. 8 is a diagram showing a modification of the control circuit 15 of FIG. As shown in the figure, the input interface 16 includes an air conditioner switch 7 and a post-evaporator temperature sensor 1
In addition to 4, an insolation sensor 19 for detecting the amount of insolation, an in-vehicle air temperature sensor 20 for detecting the air temperature inside the vehicle, an outside air temperature sensor 21 for detecting the air temperature outside the vehicle, and a cooling water temperature sensor 22 for detecting the cooling water of the engine are provided. Is entered. The microcomputer 17 processes the signals of these sensors and controls the energization and deenergization of the magnet clutch relay 8 and the condenser fan relay 9 via the output interface 18 as follows.

FIG. 9 is a diagram for explaining the processing of the microcomputer 17 of FIG. In step S11, it is determined whether the air conditioner switch is ON. If this determination is “YES”, the process proceeds to step S12, and this determination is “N
If "O", wait until "YES". In step S12, it is determined whether the post-evaporator temperature T has become equal to or higher than the reference temperature T10. The reference temperature T10 serves as a reference for determining whether to operate the air conditioning system. If this determination is "YES", the process proceeds to step S13, and if "NO", the process proceeds to step S16.

In step S13, the magnet clutch relay 8 is turned on. In step S14,
The timer is started by turning on the magnet clutch relay 8 and it is determined whether or not the elapsed time t has become the reference time t0 or more. If this determination is “YES”, step S
If it is "NO", it will wait until it becomes "YES".

In step S15, the condenser fan relay 9 is turned on. In step S16, it is determined whether or not the solar radiation sensor 19 indicating that the solar radiation amount is equal to or larger than a predetermined amount is ON. If this determination is "YES", the process proceeds to step S13, and if "NO", the process proceeds to step S17. Step S
In step 17, it is determined whether or not the vehicle interior temperature T2 has become equal to or higher than the reference temperature T20. This reference temperature T20 is a reference for determining whether or not the air conditioning system should be operated. If this determination is "YES", the process proceeds to step S13,
If “NO”, the process proceeds to step S18.

In step S18, it is determined whether or not the vehicle outside temperature T3 is equal to or higher than the reference temperature T30. This reference temperature T30 is a reference for determining whether or not to operate the air conditioning system. If this determination is "YES", the process proceeds to step S13, and if "NO", the process proceeds to step S19. In step S19, it is determined whether the cooling water temperature T4 is equal to or higher than the reference temperature T40. This reference temperature T
40 is a criterion for judging whether to operate the air conditioning system. If this determination is "YES", the process proceeds to step S13, and if "NO", the process proceeds to step S20.

In step S20, the magnet clutch relay 8 is turned off. In step S21, the timer is started by turning off the magnet clutch relay 8, and it is determined whether or not the elapsed time t has become the reference time t0 or more. If this determination is "YES", the process proceeds to step S22, and if "NO", the process waits until "YES".

In step S22, the condenser fan relay 9 is turned off. According to the present embodiment, the air conditioning system is smoothly and automatically controlled by using a plurality of sensors, but in this case as well, the load can be sequentially applied or released, and the shock due to torque fluctuations to the occupant can be reduced. . FIG. 10 is a diagram showing an air conditioning system according to a third embodiment of the present invention. Compared with the configuration of FIG. 1, the air conditioning system shown in this figure includes an evaporator fan 12 for cooling the evaporator 3 and an evaporator fan motor 1 for driving the evaporator fan 12.
3 is provided.

FIG. 11 is a diagram showing the control circuit 15 of the air conditioning system of FIG. Compared with the configuration of FIG. 6, the control circuit 15 of the air conditioning system shown in this figure is provided with an evaporator fan relay 30 for driving the evaporator fan motor 13. Further, the air conditioner switch 7 is connected to the first delay circuit 11 which delays by time t0, and the second delay circuit 31 which delays by time 2t0. By the air conditioner switch 7, the evaporator fan relay 30 is energized and deenergized via the second delay circuit 31.

FIG. 12 is a diagram for explaining the reduction of torque fluctuations of the compressor and alternator which are lost in addition to the engine. As shown in this figure (a), (b), (c),
Even when the evaporator fan 12 is provided, the condenser fan 5 is turned on after a predetermined time t0 after the magnet clutch 10 is turned on, and then the evaporator fan 12 is turned on after a predetermined time t0, and vice versa after the magnet clutch 10 is turned off. After the time t0, the condenser fan 5 is turned off, and after a predetermined time t0, the evaporator fan 12 is turned off. Therefore, this figure (d),
As shown in (e) and (f), generation and disappearance of compressor torque and alternator torque (1) and (2) are deviated,
As shown in (g) of this figure, torque fluctuations that are applied to or disappear in the engine are reduced.

FIG. 13 is a diagram showing an air conditioning system according to the fourth embodiment of the present invention. Compared with the configuration of FIG. 1, the air conditioning system shown in this figure has an evaporator fan 12 that cools the evaporator 3 and an evaporator fan motor 13 that drives the evaporator fan 12.
And a post-evaporator temperature sensor 14 is provided at the outlet of the evaporator 3.

FIG. 14 is a diagram showing the control circuit 15 of the air conditioning system of FIG. Compared with the control circuit 15 of the air conditioning system of FIG.
The microcomputer 17 includes an evaporator fan relay 3 for driving the evaporator fan motor 13.
Energizing and deactivating control of 0 is added. FIG. 15 is a flow chart for explaining the processing of the microcomputer 17 of FIG.

In step S1, it is determined whether the air conditioner switch is ON. If this determination is "YES", the process proceeds to step S2, and if this determination is "NO", "YES"
Wait until. In step S2, it is determined whether the post-evaporator temperature T has become equal to or higher than the reference temperature T0. The reference temperature T0 serves as a reference for determining whether to operate the air conditioning system. This judgment is "Y
If "ES", the process proceeds to step S3, and if "NO", the process proceeds to step S6.

In step S3, the magnet clutch relay 8 is turned on. In step S4, the timer is started by turning on the magnet clutch relay 8, and it is determined whether or not the elapsed time t has become the reference time t0 or more. This reference time is a time for biasing the magnet clutch relay 8 and the condenser fan relay 9 by shifting them. If this determination is "YES", the process proceeds to step S5, and if "NO", the process waits until "YES".

In step S5, the condenser fan relay 9 is turned on. In step S30, it is determined whether or not the elapsed time t from the timer start by turning on the magnet clutch relay 8 has become the reference time 2t0 or more. This reference time is a time for activating the condenser fan relay 9 and the evaporator fan relay 30 by shifting them. If this determination is “YES”, step S3
Proceed to 1 and if "NO", wait until "YES".

In step S31, the evaporator fan relay 30 is turned on. In step S6,
Turn off the magnet clutch relay 8. In step S7, the timer is started by turning off the magnet clutch relay 8, and the elapsed time t is the reference time t0.
It is determined whether or not it is above. This reference time is a time for deactivating the magnet clutch relay 8 and the condenser fan relay 9 by shifting them. This judgment is "YES"
If so, the process proceeds to step S8, and if "NO", the process waits until "YES".

In step S8, the condenser fan relay 9 is turned off. In step S32, it is determined whether or not the elapsed time t from the timer start by turning off the magnet clutch relay 8 has become the reference time 2t0 or more. This reference time is a time for deactivating the condenser fan relay 9 and the evaporator fan relay 30 by shifting them. If this determination is "YES", the process proceeds to step S33, and if "NO", the process waits until "YES".

In step S33, the evaporator fan relay 30 is turned off. According to the present embodiment, the air conditioning system is automatically controlled according to the post-evaporator temperature, but in this case, even if there is a large number of loads, it can be sequentially turned on or off, and shocks due to torque fluctuations to the occupants are generated. Can be reduced. FIG. 16 is a diagram showing a modification of the control circuit 15 of FIG. As shown in the figure, in addition to the air conditioner switch 7 and the evaporator post-temperature sensor 14, the input interface 16 includes an insolation sensor 19 for detecting the amount of insolation, an in-vehicle air temperature sensor 21 for detecting the air temperature inside the vehicle, and an air temperature outside the vehicle. Vehicle temperature sensor 21 to detect
Then, the cooling water temperature sensor 22 for detecting the cooling water of the engine is input. The microcomputer 17 processes the signals of these sensors and controls the energization and deenergization of the magnet clutch relay 8 and the condenser fan relay 9 via the output interface 18 as follows.

17 and 18 are diagrams for explaining the processing of the microcomputer 17 of FIG. 16 (No. 1 and No. 2). At step S11, the air conditioner switch is turned off.
Judge whether N or not. If this determination is "YES", the process proceeds to step S2, and if this determination is "NO", it waits until it becomes "YES".

In step S12, it is determined whether the post-evaporator temperature T has exceeded the reference temperature T10.
The reference temperature T10 serves as a reference for determining whether to operate the air conditioning system. This judgment is "YE
If "S", the process proceeds to step S13, and if "NO", the process proceeds to step S16. In step S13, the magnet clutch relay 8 is turned on.

In step S14, the timer is started by turning on the magnet clutch relay 8 and it is determined whether or not the elapsed time t has become the reference time t0 or more. If this determination is “YES”, the process proceeds to step S15,
If "NO", wait until "YES". Step S1
At 5, the condenser fan relay 9 is turned on.

In step S40, it is determined whether or not the elapsed time t from the timer start when the magnet clutch relay 8 is turned ON is equal to or longer than the reference time 2t0. This reference time is a time for activating the condenser fan relay 9 and the evaporator fan relay 30 by shifting them. If this determination is "YES", the process proceeds to step S41,
If "NO", wait until "YES".

In step S41, the evaporator fan relay 30 is turned on. In step S16, it is determined whether or not the solar radiation sensor 19 indicating that the solar radiation amount is equal to or larger than a predetermined amount is ON. If this determination is “YES”, step S
13. If "NO", the process proceeds to step S17. In step S17, it is determined whether or not the vehicle interior temperature T2 is equal to or higher than the reference temperature T20. This reference temperature T20 is a reference for determining whether or not the air conditioning system should be operated. If this determination is "YES", the process proceeds to step S13, and if "NO", the process proceeds to step S18.

In step S18, it is determined whether or not the vehicle outside temperature T3 is equal to or higher than the reference temperature T30. This reference temperature T30 is a reference for determining whether or not to operate the air conditioning system. If this determination is "YES", the process proceeds to step S13, and if "NO", the process proceeds to step S19. In step S19, it is determined whether the cooling water temperature T4 is equal to or higher than the reference temperature T40. This reference temperature T
40 is a criterion for judging whether to operate the air conditioning system. If this determination is "YES", the process proceeds to step S13, and if "NO", the process proceeds to step S20.

In step S20, the magnet clutch relay 8 is turned off. In step S21, the timer is started by turning off the magnet clutch relay 8, and it is determined whether or not the elapsed time t has become the reference time t0 or more. If this determination is "YES", the process proceeds to step S22, and if "NO", the process waits until "YES".

In step S22, the condenser fan relay 9 is turned off. In step S42,
It is determined whether or not the elapsed time t from the timer start by turning off the magnet clutch relay 8 has become the reference time 2t0 or more. This reference time is a time for deactivating the condenser fan relay 9 and the evaporator fan relay 30 by shifting them. If this determination is "YES", the process proceeds to step S33, and if "NO", the process waits until "YES".

In step S43, the evaporator fan relay 30 is turned off. According to the present embodiment, the air conditioning system is smoothly and automatically controlled using a plurality of sensors, but in this case, even if the number of loads is large, it can be sequentially turned on or off, and the torque to the occupant can be increased. The shock due to fluctuations can be reduced.

[0051]

As described above, according to the present invention, the connection timing of the magnet clutch and the rotation start timing of the condenser fan are shifted by a predetermined time, and the disengagement timing of the magnet clutch and the rotation stop timing of the condenser fan are changed by a predetermined time. Since it is shifted, torque fluctuations of the compressor and alternator are added to the engine at the same time, avoiding disappearance,
Reduces the shock felt by passengers. Based on the temperature at the outlet of the evaporator, either the connection time of the magnetic clutch or the rotation start time of the condenser fan, corresponding to the disengagement time of the magnet clutch or the rotation stop time of the condenser fan, , The same effect can be expected in the case of automatic driving.
Further, either one of the connection timing of the magnet clutch or the rotation start timing of the condenser fan, corresponding to this, either one of the release timing of the magnet clutch or the rotation stop timing of the condenser fan, the temperature of the outlet of the evaporator, Since it is determined based on any one of the amount of solar radiation, the temperature inside the vehicle, the temperature outside the vehicle, and the temperature of the cooling water, the same effect can be expected in the case of smoother automatic driving. Even if an additional evaporator fan is installed to cool the evaporator,
The torque fluctuations of the compressor and multiple alternators are added to the engine at the same time, which prevents the torque fluctuations from disappearing and reduces the shock felt by the occupants. Further, in the case of automatic operation as well as in smoother automatic operation, torque fluctuations of the compressor and the plurality of alternators are simultaneously applied to the engine to prevent the torque fluctuations from disappearing, and the shock felt by the occupant is reduced. Optimum control is possible by specifically setting the predetermined time to about 2 seconds.

[Brief description of drawings]

FIG. 1 is a diagram showing an air conditioning system according to a first embodiment of the present invention.

FIG. 2 is a control circuit 1 of the air conditioning system.
It is a figure which shows 5.

FIG. 3 is a diagram for explaining in detail switching timings of the magnet clutch 10 and the condenser fan 5.

FIG. 4 is a time chart illustrating reduction of torque fluctuations of a compressor and an alternator that are simultaneously added to an engine and disappear.

FIG. 5 is a diagram showing an air conditioning system according to a second embodiment of the present invention.

6 is a diagram showing a control circuit 15 of the air conditioning system of FIG.

7 is a flowchart illustrating a process of the microcomputer 17 of FIG.

8 is a diagram showing a modified example of the control circuit 15 of FIG.

9 is a diagram illustrating a process of the microcomputer 17 of FIG.

FIG. 10 is a diagram showing an air conditioning system according to a third embodiment of the present invention.

11 is a diagram showing a control circuit 15 of the air conditioning system of FIG.

FIG. 12 is a diagram illustrating reduction of torque fluctuations of a compressor and an alternator that are lost when they are added to an engine.

FIG. 13 is a diagram showing an air conditioning system according to a fourth embodiment of the present invention.

14 is a diagram showing a control circuit 15 of the air conditioning system of FIG.

15 is a flowchart illustrating a process of the microcomputer 17 of FIG.

16 is a diagram showing a modification of the control circuit 15 of FIG.

FIG. 17 is a diagram for explaining the process of the microcomputer 17 of FIG. 16 (No. 1).

FIG. 18 is a diagram for explaining the processing of the microcomputer 17 of FIG. 16 (No. 2).

FIG. 19 is a diagram for explaining the torque that is lost by being applied to the engine by the conventional air conditioning system.

[Explanation of symbols]

 1 ... Compressor 2 ... Condenser 3 ... Evaporator 5 ... Condenser fan 10 ... Magnet clutch 12 ... Evaporator fan 15 ... Control circuit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mitsuo Inagaki 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Japan Auto Parts Research Institute (72) Inventor Kenji Kanehara 14 Iwatani, Shimohakaku-cho, Nishio-shi, Aichi Stock Association Company Japan Automotive Parts Research Institute (72) Inventor Koji Yamanaka 1-1, Showa-cho, Kariya city, Aichi prefecture Nihon Denso Co., Ltd.

Claims (7)

[Claims] 1. A controller for an air conditioning system for a vehicle, comprising a compressor, a condenser, and an evaporator, a magnet clutch for connecting and disconnecting the compressor and an engine of the vehicle, a condenser fan for cooling the condenser, and the magnet. A control circuit is provided which shifts the clutch connection timing and the condenser fan rotation start timing by a predetermined time, and correspondingly shifts the magnet clutch disengagement timing and the condenser fan rotation stop timing by a predetermined time. Control device for air conditioning system. 2. The control circuit sets either one of the connection timing of the magnet clutch and the rotation start timing of the condenser fan, and corresponding to either the release timing of the magnet clutch or the rotation stop timing of the condenser fan. The controller of the air conditioning system according to claim 1, wherein one of the two is determined based on a temperature of a blowout port of the evaporator. 3. The control circuit sets either one of the connection timing of the magnet clutch or the rotation start timing of the condenser fan, and corresponding to either the release timing of the magnet clutch or the rotation stop timing of the condenser fan. The air-conditioning system according to claim 1, wherein one of them is determined based on any one of a temperature of an outlet of the evaporator, a solar radiation amount, a vehicle interior temperature, a vehicle exterior temperature, and a cooling water temperature. Control device. 4. A controller for an air conditioning system for a vehicle, comprising a compressor, a condenser and an evaporator, a magnet clutch for connecting and disconnecting the compressor and an engine of the vehicle, a condenser fan for cooling the condenser, and an evaporator. An evaporator fan for cooling, the connection timing of the magnet clutch, the rotation start timing of the condenser fan and the rotation start timing of the evaporator fan are mutually shifted by a predetermined time, and correspondingly, the release timing of the magnet clutch and A control device for an air conditioning system, comprising: a control circuit that shifts the rotation stop timing of the condenser fan and the rotation stop timing of the evaporator fan from each other by a predetermined time. 5. The control circuit comprises: a connection timing of the magnet clutch, a rotation start timing of the condenser fan,
Either one of the rotation start timing of the evaporator fan, corresponding to this, one of the magnet clutch disengagement timing, the condenser fan rotation stop timing, and the evaporator fan rotation stop timing is set to the evaporator outlet temperature. The control device of the air conditioning system according to claim 4, wherein the control device is determined based on 6. The control circuit comprises: a connection timing of the magnet clutch, a rotation start timing of the condenser fan,
Either one of the rotation start timing of the evaporator fan, corresponding to the disengagement timing of the magnet clutch, the rotation stop timing of the condenser fan, and the rotation stop timing of the evaporator fan is corresponding to the outlet of the evaporator. Temperature, solar radiation, vehicle interior temperature, vehicle exterior temperature,
The control device of the air conditioning system according to claim 4, wherein the determination is made based on any one of the cooling water temperatures. 7. The control device for an air conditioning system according to claim 1, wherein the control circuit sets the predetermined time to about 2 seconds.