JP2000351317A - Air conditioning device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioning device for vehicle capable of reducing power consumption and allowing use of a small electric motor by optimizing the timing for stopping an engine, the timing for controlling a compressor to low capacity, and the timing for starting the motor, respectively, in the air conditioning device for vehicle. SOLUTION: In this air conditioning device for vehicle, capacity of an external control type variable capacity compressor 2 is reduced to capacity below a predetermined value before a predetermined time at the time when the drive of the compressor 2 ends by a driving force transmission means selection means 8 selecting at least either or both of an engine driving force transmission means 4 and an auxiliary machinery driving force transmission means 5 and an engine 1, when the compressor 2 is used by an air conditioning means 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile for stopping an engine (engine) in a so-called idling stop state,
In a so-called hybrid vehicle in which a vehicle is driven by at least one of an engine and a motor, even when an auxiliary device such as an air-conditioning compressor is driven, the engine can be stopped to improve fuel efficiency. It relates to an air conditioner.

[0002]

2. Description of the Related Art Conventionally, an air conditioner for a vehicle has been disclosed in
No. 0-236151. This is because when the compressor is started by the electric motor, the physical size of the electric motor is increased, and to prevent the vehicle mountability from being deteriorated.
Using an external capacity control compressor as the compressor,
It is characterized in that the capacity of the external control compressor is reduced before starting the electric motor.

Further, in the prior art disclosed in Japanese Patent Application Laid-Open No. Hei 10-291415, a drive source is selected according to a required cooling capacity in a refrigeration cycle. If it is above, the compressor is driven by the engine, and if the cooling capacity is below a predetermined value,
The compressor is driven by an electric motor.

[0004]

However, in such a conventional technique, since the time required for controlling the external variable displacement compressor to a low capacity is not considered, the engine is stopped, the compressor is set to a low capacity, and then the electric power is reduced. It takes some time to start the motor. That is, in order to reduce the capacity of the compressor, for example, control from the maximum capacity to the minimum capacity requires at least several seconds. During this time, if the compressor is stopped, the cooling capacity naturally drops, and the temperature of the conditioned air blown into the passenger compartment rises, giving rise to a problem of discomfort to the occupant. Therefore, it was necessary to find a better time to control the compressor to a low capacity. Furthermore, when the electric motor is started after the engine is stopped, there is a problem that the starting torque of the electric motor is large, and the physical size of the electric motor itself is increased. In order to solve this, it is necessary to optimize the timing for stopping the engine, the timing for controlling the compressor to have a low capacity, and the timing for starting the electric motor.

[0005] The present invention has been made in view of such problems of the prior art, and in an air conditioner for a vehicle,
By optimizing the timing to stop the engine, the timing to control the compressor to low capacity, and the timing to start the electric motor, power consumption is low,
It is another object of the present invention to provide a vehicle air conditioner that can use a small-sized motor.

[0006]

According to the first aspect of the present invention, there is provided a so-called external control type in which an engine for generating a driving force of a vehicle and a refrigerant are pressurized and supplied to an air conditioner, and a discharge amount can be varied by an external signal. A variable capacity compressor, an auxiliary machine driving means such as an electric motor for driving a vehicle auxiliary machine such as the compressor, an engine driving force transmitting means for driving the compressor by a driving force of the engine, and the auxiliary machine driving means. An engine driving force transmitting means for driving the compressor; a refrigeration cycle including at least the compressor refrigerant condensing means, a refrigerant expansion means, a refrigerant evaporating means, and a pipe for flowing the refrigerant; Air conditioning means for controlling the temperature of the air conditioner, when the compressor is used by the air conditioning means, And a driving force transmitting means selecting means for selecting at least one or both of the auxiliary driving force transmitting means and the auxiliary machine driving force transmitting means, and a predetermined time before the end of driving the compressor by the engine, the external control type. The capacity of the variable displacement compressor is reduced to a capacity equal to or less than a predetermined value.

According to a second aspect of the present invention, in the vehicle air conditioner according to the first aspect, the compressor has a minimum capacity which can be set as a predetermined value of the capacity reduction.

According to a third aspect of the present invention, in the vehicle air conditioner according to the first or second aspect, the auxiliary device driving means is provided before the second predetermined time before the driving of the engine is stopped. An apparatus which starts up and drives the compressor by the accessory driving force transmission means.

According to a fourth aspect of the present invention, in the vehicle air conditioner according to the first aspect, a compressor capacity detecting means for detecting a capacity of the compressor; A device characterized by extending the time.

According to a fifth aspect of the present invention, in the vehicle air conditioner according to any one of the first to fourth aspects, a refrigeration cycle state detecting means for detecting a state of the refrigeration cycle is provided as the compressor capacity detecting means, The apparatus is a heat load detection type compressor capacity detection means for judging that the larger the heat load state of the refrigeration cycle is, the larger the capacity is.

According to a sixth aspect of the present invention, in the vehicle air conditioner according to the third aspect, as the refrigeration cycle state detecting means, either the high-pressure side gas pressure or the high-pressure side gas temperature of the refrigeration cycle is used. An apparatus characterized by detecting.

According to a seventh aspect of the present invention, in the vehicle air conditioner according to any one of the first to sixth aspects, when the compressor is driven by the engine by the engine driving force transmitting means, the engine is driven. When the drive stop command is received, the capacity of the compressor is reduced to a predetermined value or less, and the engine that is driving the compressor is stopped by the engine driving force transmission unit after a predetermined time after a predetermined time, or An apparatus for cutting off transmission of driving force to the compressor.

According to the invention described in claim 8, in the vehicle air conditioner according to any one of claims 1 to 6, when the compressor is driven by the engine by the engine driving force transmitting means, the engine is started. When the drive stop command is received, the accessory drive means also drives the compressor, reduces the capacity of the compressor to a predetermined value or less, and drives the compressor by the engine driving force transmission means after a predetermined time. An apparatus for stopping an engine or cutting off transmission of driving force from the engine to the compressor.

According to a ninth aspect of the present invention, in the air conditioner, an engine stop instruction delay means for delaying an engine stop instruction for stopping the operation of the engine until a predetermined engine stop condition is satisfied; When the compressor is used, a driving force transmitting means selecting means for selecting at least one or both of the engine driving force transmitting means and the auxiliary machine driving force transmitting means, and a capacity detecting means for detecting a capacity of the compressor When the engine stop command is received, the capacity of the compressor is reduced to a capacity equal to or less than a predetermined value, and when the capacity of the compressor is equal to or less than a predetermined value, the predetermined capacity is detected by the capacity detection means. An apparatus for determining that an engine stop condition is satisfied.

According to a tenth aspect of the present invention, in the vehicle air conditioner according to the ninth aspect, the driving of the engine is stopped when the engine is driven by the engine by the engine driving force transmitting means. Upon receiving the command,
The capacity of the compressor is reduced to a predetermined value or less, and when the capacity of the compressor is reduced to a predetermined value or less by the capacity detection means, it is determined that the predetermined engine stop condition is satisfied.

According to a twelfth aspect of the present invention, in the vehicle air conditioner according to the ninth aspect, the driving of the engine is stopped when the engine is driven by the engine by the engine driving force transmitting means. Upon receiving the command,
Starting the auxiliary equipment driving means, the auxiliary equipment driving means also drives the compressor by the auxiliary equipment driving force transmission means, and reduces the capacity of the compressor to a predetermined value or less. When the capacity of the compressor becomes equal to or less than a predetermined value, it is determined that the predetermined engine stop condition is satisfied.

[0017]

According to the first aspect of the present invention, the compressor capacity control is started a predetermined time before the engine is stopped, the capacity is reduced from the current capacity to the predetermined capacity, and the low capacity is set before the engine is stopped. Because the compressor is low-capacity at any time just after the engine stops or at any time after the engine stops, the compressor is driven by the auxiliary drive means such as a motor. The load is small, and the physique of accessory driving means such as a motor can be reduced.

Further, when the vehicle is in the idling stop state, by performing control to reduce the capacity of the external control type variable displacement compressor immediately before stopping the engine, when the compressor needs to be operated by the air conditioner, The problem that the compressor stops when the engine is stopped can be avoided. Furthermore, the problem that the load of the electric motor becomes excessive due to the starting torque and the inertia torque that occurs when the electric motor is started and the compressor is driven by the electric motor is another problem that the engine is stopped by starting the electric motor before stopping the engine. The starting torque and inertia torque of the electric motor at the time can also be reduced, so that the size of the electric motor can be reduced, and the weight can be reduced and the vehicle mounting system can be improved.

According to the second aspect of the present invention, by setting the minimum capacity as the predetermined capacity to reduce the capacity, the compressor drive load can be further reduced.

According to the third aspect of the present invention, the compressor is reduced in capacity to reduce the compressor load before the engine is stopped, and the auxiliary drive means such as a motor is started before the engine is stopped. Since the motor does not follow the entire load of the compressor, the starting current of the motor can be reduced, thereby reducing the size of the motor.

In the present invention, the time until the compressor low-capacity control is started before the engine stops, that is, the predetermined time is set according to the discharge amount of the compressor. Is larger, the transition time to the predetermined capacity can be increased. For example, when the discharge amount is small, the engine can be stopped earlier and the fuel consumption can be reduced by shortening the predetermined time.

According to the seventh aspect of the invention, when the engine stop command is issued, the compressor enters the low-capacity control mode. However, the engine is not stopped, and after a predetermined time, the engine is stopped. The driving load when the compressor is driven by the machine driving means can be reduced. Thereby, the physique of a motor or the like can be reduced.

According to the invention described in claim 8, since the auxiliary device driving means such as the motor is started before the engine is stopped, the starting current of the motor can be reduced, thereby reducing the size of the motor. Can be smaller.

According to the ninth to eleventh aspects of the present invention, when the engine stop command is issued, it is determined that the engine stop condition is not satisfied, the engine does not stop, and the control enters the low capacity control of the compressor. Next, when the compressor becomes smaller than the predetermined capacity, it is determined that the engine stop condition is satisfied, and the engine is stopped. At this time, the starting current of the motor and the like can be reduced by starting the accessory driving means such as the motor from the time when the engine stop command is issued.
Therefore, power consumption can be reduced and the size of the motor can be reduced.

[0025]

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

(Embodiment 1) FIG. 2 is a schematic explanatory view of a vehicle air conditioner provided with a hybrid compressor according to the present invention.

First, the structure will be described.
When the clutch 8 is connected through the pulley 3, the V-belt 7, and the clutch 8, the compressor 2 is driven. On the other hand, the compressor 2 is also operated by an electric motor (accessory driving means) 52, and this transmission force drives the compressor 2 via the pulleys 5 and 6.

A refrigeration cycle 9 including the compressor 2
Are the condenser 10, the liquid tank 11, the expansion valve 1
2, an evaporator 13, and a refrigerant pipe 14 connecting these to form a refrigerant passage. The cooling air generated by the refrigeration cycle 9 can cool the conditioned air. The air conditioner includes the refrigeration cycle 9, cools the conditioned air generated by the fan 15 by the evaporator 13 as described above, and controls the conditioned air that passes through the heater core 17 according to the opening degree of the air mix door 16 and the air that does not pass. Generate wind. Further, the conditioned air can be blown into the vehicle compartment from each outlet according to the opening degree of each of the defroster air distribution control door 18, the ventilator air distribution control door 19, and the underflow air distribution control door 20. Cooling water (hot air) of the engine (engine) 1 is supplied to a heater core 17 for heating the conditioned air by a cooling water pipe 21, and the amount thereof is adjusted by a hot water control valve 22.

By the way, in the expansion valve 12 described above, the temperature-sensitive cylinder 23
The opening degree is set in accordance with the temperature of the evaporator outlet refrigerant detected in the above. When the refrigerant temperature is high, the opening degree is opened, so that more refrigerant flows.

A high-pressure detector 24 is provided on the high-pressure pipe connected to the outlet of the compressor 2 so that the state of the refrigeration cycle 9 can be detected. That is, if the high pressure is high, the load of the refrigeration cycle is high, and the driving force of the compressor 2 is relatively large.
The compressor speed detection circuit 25 receives the vehicle speed signal and the engine speed signal from the air conditioner control amplifier 26, and combines the signal with the pressure detected by the high-pressure pressure detector 24 to form the driving load of the compressor 2 and the compressor 2
Can be calculated. That is, the higher the engine speed, the higher the speed of the compressor 2 and the higher the refrigerant discharge rate.

As a result, the amount of the refrigerant passing through the condenser 10 increases, and the high-pressure side of the refrigeration cycle 9 rises because the amount of cooling by the outside air is insufficient. That is, the high pressure is higher. On the other hand, when the vehicle speed increases, the amount of outside air passing through the condenser 10 increases,
The higher pressure is lower because the ability to cool the high pressure refrigerant is higher. Next, if the capacity is controlled so as to increase the amount of refrigerant discharged per one rotation of the compressor 2, the amount of refrigerant passing through the condenser 10 increases, so that the high-pressure side pressure becomes higher. As described above, the high-pressure side pressure of the refrigeration cycle 9 is affected by the engine speed, the vehicle speed, and the compressor discharge capacity. Therefore, the high-pressure side pressure, the engine speed, and the vehicle speed are detected, and the compressor discharge capacity is calculated from these. it can.

Next, signals from the solar radiation sensor 27, the outside air temperature sensor 28, the room temperature sensor 29, the vehicle speed sensor 30, the evaporator outlet air temperature sensor 31, and the like are input to the air conditioner control amplifier 26, and as described above. A signal from the high-pressure pressure detector 24 from the compressor capacity detection circuit 25, an engine stop signal 33, an engine speed signal 34, and an idling signal 35 from the engine control amplifier 32 are input. The vehicle speed is sent from the air conditioner control amplifier 26 to the compressor capacity detection circuit 25. The air conditioner control amplifier 26 outputs a compressor capacity signal 36 to the compressor capacity control circuit 53, and the air conditioner control amplifier 26 outputs a compressor drive signal 37 and an engine stop signal to the engine control amplifier 32. A delay signal 38 and a compressor drive signal 39 are output. . The air conditioner control amplifier 26 also has a blower outlet setting signal 41 and a room temperature setting signal 4 from an air conditioner control panel 40 as an air conditioner adjusting device for an occupant in the vehicle.
2, an air inlet setting signal 43, an air volume setting signal 44, a compressor setting signal 45, an automatic control setting signal 46 as a so-called automatic air conditioner, and an air conditioner operation stop setting signal 47 are input.

An ignition switch 48, a vehicle speed sensor 30, a compressor drive signal 37, an engine stop delay signal 38, a compressor drive system signal 39, and the like are input to the engine control amplifier 32. The engine stop signal 33, the engine speed signal 34, It outputs the idling signal 35 to the air conditioner control amplifier 26 and outputs the compressor drive system selection signal 39 to the compressor drive system selection circuit 54.

In the compressor drive system selection circuit 54,
Based on the compressor drive system selection signal 39 from the engine control amplifier 32, the compressor (engine) 1 alone, the electric motor 52 alone, or both the engine 1 and the electric motor 52 are selected as the compressor drive source.

The compressor capacity control circuit 53 outputs a set capacity signal to the capacity control valve 49 of the compressor 2 based on a signal from the air conditioner control amplifier 26, and discharges the refrigerant amount per one rotation of the compressor 2 (discharge amount). To adjust.

Next, the operation will be described.

FIG. 3 shows a flowchart of the engine stop control in FIG.

In step S101, the engine control amplifier 3
2 and predetermined data are input to the air conditioner control amplifier 26.

In step S102, the engine control amplifier 3
At 2, the vehicle is driven and controlled.

In step S103, the air conditioner is controlled by the air conditioner control amplifier 26.

In step S104, the engine control amplifier 3
It is determined whether the current mode is the pre-engine-stop mode issued by step 2. If the mode is the pre-engine-stop mode, the process proceeds to step S105; otherwise, the process proceeds to step S110.

In step S105, low displacement control is performed to reduce the displacement of the external control type variable displacement compressor.

In step S106, it is determined whether the mode is the motor start mode. If the mode is the motor start mode, the process proceeds to step S107; otherwise, the process proceeds to step S110.

In step S107, the electric motor 52 is started, and if the electric motor 52 has already been started, the operation is continued.

In step S108, it is determined whether or not the engine is in the engine stop mode.
09, otherwise to step S110.

In step S109, the engine 1 is stopped.

In step S110, the engine 1 is started,
If it is running, it runs as it is.

In step S111, the operation of the electric motor 52 is stopped.

In step S112, these modes are canceled.

That is, predetermined data is input to the engine control amplifier 32 and the air conditioner control amplifier 26, the engine control amplifier 32 controls the driving of the vehicle, and the air conditioner control amplifier 26 controls the air conditioner. Engine control amplifier 3
When the pre-engine-stop mode is issued by 2, low displacement control for reducing the displacement of the externally controlled variable displacement compressor is performed. FIG. 9 shows the relationship between the predetermined time and the compressor displacement in the first embodiment of the present invention. A time until the compressor low-capacity control is started before the engine is stopped, that is, a predetermined time is set according to the discharge amount of the compressor 2. With this control, it is possible to cope with a longer transition time to the predetermined capacity as the discharge amount of the compressor 2 is larger. For example, when the discharge amount is small, the engine 1 is stopped earlier by shortening the predetermined time. And the fuel consumption can be reduced.

Next, in the motor start mode, the electric motor 52 is started, and in the engine stop mode, the engine 1 is stopped.

FIG. 6 is a time chart showing the operating state of the engine 1 and the change in the capacity of the compressor 2 according to Embodiment 1 of the present invention.

This is a control in which the capacity of the compressor 2 is controlled before the engine 1 is stopped for a predetermined time, the control for reducing the current capacity to the predetermined capacity is performed, and the capacity is reduced before the engine 1 is stopped. Under such control, the compressor 2 is driven by the electric motor 52 at any time before the engine stops or after the engine stops, since the compressor 2 has a low capacity. The load is small, and the size of the electric motor 52 can be reduced.

FIG. 7 is a time chart showing the operating state of the engine 1 and the change in the capacity of the compressor 2 according to Embodiment 1 of the present invention.

The control is basically the same as the control in FIG. 3 described above. However, the compressor drive load can be further reduced by setting the minimum capacity as a predetermined capacity for reducing the capacity.

FIG. 8 is a time chart showing the operating state of the engine 1, the operating state of the electric motor 52, and the change in the capacity of the compressor 2 according to Embodiment 1 of the present invention.

As shown in the figure, three modes are set. The capacity control of the compressor 2 is started a predetermined time (1) before stopping the engine, which is set a little longer, and a period set a little shorter. The operation of the electric motor 52 is started a predetermined time (2) before the stop. This control reduces the compressor load by reducing the capacity of the compressor 2 before the engine 1 is stopped, and reduces the electric motor 52 before the engine 1 is stopped.
Is started, the electric motor 52 does not bear the entire load of the compressor 2, so that the starting current of the electric motor 52 can be reduced, thereby making it possible to reduce the size of the electric motor 52.

(Second Embodiment) The basic configuration is the same as that of the first embodiment, and therefore, different portions of the engine start control will be described.

FIG. 4 shows a flowchart in the control for issuing the engine stop command.

In step S201, the engine control amplifier 3
2 and predetermined data are input to the air conditioner control amplifier 26.

In step S202, the engine control amplifier 3
At 2, the vehicle is driven and controlled.

In step S203, the air conditioner control amplifier 36 controls the air conditioner.

In step S204, it is determined whether or not the command is an engine stop command.
Go to step 5, otherwise go to step 210.

In step S205, low displacement control for reducing the displacement of the external control type variable displacement compressor is performed.

In step S206, it is determined whether the mode is the motor start mode. If the mode is the motor start mode, the process proceeds to step S207; otherwise, the process proceeds to step S210.

In step S207, the electric motor 52 is started, and if the electric motor 52 has already been started, it is operated as it is.

In step S208, it is determined whether a predetermined time has elapsed. If the predetermined time has elapsed, the process proceeds to step S209, and if not, the process proceeds to step S210.
Proceed to.

In step S209, the engine 1 is stopped.

In step S210, the engine 1 is started,
If it is running, it runs as it is.

In step S211, the operation of the electric motor 52 is stopped.

In step S212, these modes are canceled.

That is, predetermined data is input to the engine control amplifier 32 and the air conditioner control amplifier 26, the engine control amplifier 32 controls the driving of the vehicle, and the air conditioner control amplifier 26 controls the air conditioner. Engine control amplifier 3
2. When an engine stop command is issued from the engine 2, an external control type variable displacement compressor discharge capacity is controlled to be lower than the discharge capacity. If the motor start mode, the electric motor 52 is started. To stop.

FIG. 10 is a time chart showing an engine stop command, the capacity of compressor 2 and the operating state of engine 1 according to the second embodiment of the present invention.

At the time when the engine stop command is issued, although the low capacity control of the compressor 2 is started, the engine 1 is not stopped.
After a predetermined time, the engine 1 is stopped, so that the electric motor 52 is stopped.
As a result, the driving load when driving the compressor 2 can be reduced. Thus, the physical size of the electric motor 52 can be further reduced.

FIG. 11 is a time chart showing an engine stop command, a change in the capacity of the compressor 2, and an operating state of the electric motor 52 and the engine according to the second embodiment of the present invention. When the engine stop command is issued, the operation of the engine is continued for a predetermined time, and the capacity control of the compressor 2 is started, and at the same time, the electric motor 5
2 starts operation. Thus, by starting the electric motor 52 before the engine 1 is stopped, the driving force of both the engine 1 and the electric motor 52 acts on the compressor 2 so that the starting current of the electric motor 52 can be reduced. Thus, the physical size of the electric motor 52 can be reduced.

(Embodiment 3) The basic configuration is the same as that of Embodiment 1, and therefore, different parts of the control will be described.

FIG. 5 shows a flowchart of the engine start control when the engine stop condition is set.

In step S301, the engine control amplifier 3
2 and predetermined data are input to the air conditioner control amplifier 26.

In step S302, the engine control amplifier 3
At 2, the vehicle is driven and controlled.

In step S303, the air conditioner control amplifier 26 controls the air conditioner.

In step S304, it is determined whether or not the command is an engine stop command.
Go to step 5; otherwise go to step 310.

In step S305, low displacement control is performed to reduce the discharge displacement of the external control type variable displacement compressor.

In step S306, it is determined whether the mode is the motor start mode. If the mode is the motor start mode, the process proceeds to step S307; otherwise, the process proceeds to step S310.

In step S307, the electric motor 52 is started, and if the electric motor 52 has already been started, the operation is continued.

In step S308, it is determined whether or not the compressor 2 has a predetermined capacity or less. If it is equal to or less than the predetermined amount, the process proceeds to step S309. If not, the process proceeds to step S310.

In step S309, it is confirmed that the engine stop condition is satisfied.

In step S310, it is confirmed that the engine stop condition is not satisfied.

In step S311, the engine 1 is stopped.

In step S312, the engine 1 is started, and
If it is running, it keeps running.

In step S313, the operation of the electric motor 52 is stopped.

In step S314, the respective modes of the pre-engine stop mode, the compressor low displacement control, and the engine stop mode are released.

That is, predetermined data is input to the engine control amplifier 32 and the air conditioner control amplifier 26, the engine control amplifier 32 controls the driving of the vehicle, and the air conditioner control amplifier 26 controls the air conditioner. Engine control amplifier 3
When the engine stop command is issued from the engine 2, the external control type variable displacement compressor discharge capacity is reduced, and in the motor start mode, the electric motor 52 is started and the compressor 2
Is less than or equal to a predetermined capacity, the engine is determined to be satisfied, and the engine is stopped.

FIG. 12 is a time chart showing an engine stop command, a change in the capacity of the compressor 2, an engine stop condition, and an operating state of the engine 1 according to the second embodiment of the present invention.

At the time when the engine stop command is issued, it is determined that the engine stop condition is not satisfied, and the engine 1 does not stop, and the compressor 2 starts low capacity control. Next, when the compressor 2 becomes smaller than the predetermined capacity, it is determined that the engine stop condition is satisfied, and the engine 1 is stopped. As a result, after the engine stop command is issued, the starting current of the electric motor 52 can be reduced, and the size of the electric motor 52 can be reduced.

FIG. 13 is a time chart showing an engine stop command, a change in the capacity of the compressor 2, an engine stop condition, an operating state of the engine 1, and an operating state of the electric motor 52 according to the second embodiment of the present invention. 9 is basically the same as the time chart of FIG. 9, but by starting the electric motor 52 from the point in time when the engine stop command is issued, even if the capacity of the compressor 2 is high, the engine 1 and the electric motor 5
Since the two driving forces are input, the starting current of the electric motor 52 can be reduced.

[Brief description of the drawings]

FIG. 1 is a view corresponding to a claim showing a vehicle air conditioner of the present invention.

FIG. 2 is an overall system diagram showing the vehicle air conditioner according to the first embodiment.

FIG. 3 shows a flowchart of engine stop control according to the first embodiment.

FIG. 4 shows a flowchart of engine stop control according to a second embodiment.

FIG. 5 shows a flowchart of engine stop control according to a third embodiment.

FIG. 6 shows a time chart of an engine operating state and a change in compressor capacity in the first embodiment.

FIG. 7 shows a time chart of an engine operating state and a change in compressor capacity in the first embodiment.

FIG. 8 shows a time chart of an engine operating state, an electric motor operating state, and a change in compressor capacity in the first embodiment.

FIG. 9 shows a relationship between a predetermined time and a compressor displacement in the first embodiment.

FIG. 10 shows a time chart of an engine stop command, an engine operating state, and a change in compressor capacity in the second embodiment.

FIG. 11 is a time chart showing an engine stop command, a change in compressor capacity, an electric motor operating state, and an engine operating state in the second embodiment.

FIG. 12 shows a time chart of an engine stop command, a change in compressor capacity, an engine stop condition, and an engine operating state in the third embodiment.

FIG. 13 shows a time chart of an engine stop command, a change in compressor capacity, an engine stop condition, an engine operating state, and an electric motor operating state in the third embodiment.

[Explanation of symbols]

 Reference Signs List 1 engine 2 compressor 3, 4, 5, 6 pulley 7 V belt 8 clutch 9 refrigeration cycle 10 condenser 11 liquid tank 12 expansion valve 13 evaporator 14 refrigerant pipe 15 fan 16 air mix door 17 heater core 18 defroster air distribution control door 19 ventilator distribution Wind control door 20 Underfoot blow-out air distribution control door 21 Cooling water pipe 22 Hot water control valve 23 Temperature sensing tube 24 High pressure pressure detector 25 Compressor capacity detection circuit 26 Air conditioner control amplifier 27 Solar radiation sensor 28 Outside temperature sensor 29 Room temperature sensor 30 Vehicle speed Sensor 31 Evaporator outlet air temperature sensor 32 Engine control amplifier 33 Engine stop signal 34 Engine speed signal 35 Idling signal 36 Compressor capacity signal 37 Compressor drive signal 38 Engine stop delay signal 39 Presser driving system signal 40 Air conditioner control panel 41 Air outlet setting signal 42 Room temperature setting signal 43 Air outlet setting signal 44 Air volume setting signal 45 Compressor setting signal 46 Automatic control setting signal 47 Air conditioner operation stop signal 48 Ignition switch 49 Capacity control valve 50 Battery 51 Starter generator 52 Electric motor 53 Compressor capacity control circuit 54 Compressor drive system selection circuit (1) Engine (2) External variable capacity compressor (3) Auxiliary equipment drive means (4) Driving force transmission means (5) Driving force transmission means ( 6) Refrigeration cycle (7) Air conditioning means (8) Driving force transmission means selection means

Claims (11)

[Claims] An engine (1) for generating a driving force for a vehicle, a so-called external control type variable displacement compressor (2) that pressurizes a refrigerant and supplies the air to an air conditioner, and can vary a discharge amount by an external signal. Accessory driving means (3) such as an electric motor for driving vehicle accessories such as a compressor (2); and engine driving force transmitting means (4) for driving the compressor (2) by the driving force of the engine (1). And the compressor (2) by the accessory driving means (3).
A refrigeration cycle (6) comprising at least the compressor refrigerant condensing means, the refrigerant expansion means, the refrigerant evaporating means, and a pipe for flowing the refrigerant, and the like. An air conditioner (7) for controlling the temperature of the air in the vehicle compartment; and an engine driving force transmitting means (4) when the compressor (2) is used by the air conditioner (7). A driving force transmitting means selecting means (8) for selecting at least one or both of the accessory driving force transmitting means (5); and a predetermined time before the end of driving the compressor (2) by the engine (1). The air conditioner for a vehicle, wherein the capacity of the external control type variable displacement compressor (2) is reduced to a capacity equal to or less than a predetermined value. 2. A vehicle air conditioner according to claim 1, wherein said compressor has a minimum capacity that can be set as a predetermined value of said capacity reduction. 3. The vehicle air conditioner according to claim 1, wherein the auxiliary device driving means (3) is activated before a second predetermined time before the driving of the engine (1) is stopped. An air conditioner for a vehicle, wherein the compressor is driven by the accessory driving force transmitting means (5). 4. The vehicle air conditioner according to claim 1, wherein a compressor capacity detecting means (9) for detecting a capacity of the compressor (2); An air conditioner for a vehicle, wherein a predetermined time is extended. 5. The vehicle air conditioner according to claim 1, wherein a refrigeration cycle state detection means (10) for detecting a state of the refrigeration cycle (6) is provided as the compressor capacity detection means (9). An air conditioner for a vehicle, which is a heat load detection type compressor capacity detection means for judging that the larger the heat load state of the refrigeration cycle is, the larger the capacity is. 6. The air conditioner for a vehicle according to claim 3, wherein the refrigeration cycle state detecting means (10) detects either a high pressure side gas pressure or a high pressure side gas temperature of the refrigeration cycle. Vehicle air conditioner. 7. The vehicle air conditioner according to claim 1, wherein the engine (2) is driven by the engine (1) by the engine driving force transmitting means (4). When the drive stop command of (1) is received, the capacity of the compressor (2) is reduced to a predetermined value or less, and the compressor (2) is driven by the engine driving force transmission means (4) after a predetermined time after a predetermined time. An air conditioner for a vehicle, wherein the engine (1) is stopped or the transmission of driving force from the engine (1) to the compressor (2) is cut off. 8. The air conditioner for a vehicle according to claim 1, wherein the engine (2) is driven by the engine (1) by the engine driving force transmitting means (4). Upon receiving the drive stop command of (1), the accessory drive means (3) also drives the compressor (2), reduces the capacity of the compressor (2) to a predetermined value or less, and after a predetermined time, the engine Driving force transmission means (4)
The engine (1) that is driving the compressor (2) is stopped, or the transmission of driving force from the engine (1) to the compressor (2) is stopped. . 9. An engine stop command (1) for stopping driving of the engine (1) in the vehicle air conditioner.
An engine stop command delay means (12) for delaying 1) until a predetermined engine stop condition is satisfied; and an engine drive force transmitting means (4) when the compressor (2) is used by the air conditioning means (7). ), A driving force transmitting means selecting means (8) for selecting at least one or both of the auxiliary machine driving force transmitting means (5), and a capacity detecting means (9) for detecting a capacity of the compressor (2). When the engine stop command (11) is received, the capacity of the compressor (2) is reduced to a capacity equal to or less than a predetermined value, and the capacity detection means (9) causes the capacity of the compressor (2) to be reduced. Is determined to satisfy the predetermined engine stop condition when the engine is below a predetermined value. 10. The vehicle air conditioner according to claim 9, wherein the engine (1) is driven when the engine (1) is driven by the engine (1) by the engine driving force transmitting means (4). ), The capacity of the compressor (2) is reduced to a predetermined value or less. When the capacity of the compressor (2) is reduced to a predetermined value or less by the capacity detecting means (9), the predetermined capacity is reduced. An air conditioner for a vehicle, which determines that an engine stop condition is satisfied. 11. The air conditioner according to claim 9, wherein the engine (1) is driven by the engine (1) by the engine driving force transmitting means (4). ), The accessory drive means (3) is started to be activated, and the accessory drive means (3) is also driven by the accessory drive means (3) by the accessory drive force transmitting means (5). At the same time, the capacity of the compressor (2) is reduced to a predetermined value or less, and when the capacity of the compressor (2) is reduced to a predetermined value or less by the capacity detection means (9), it is determined that the predetermined engine stop condition is satisfied. An air conditioner for a vehicle.