JP2004026076A - Method of driving hybrid compressor for vehicle air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of driving a hybrid compressor for a vehicle air conditioner that can start a predetermined compressor in a short time by a simple operation. <P>SOLUTION: This method of driving a hybrid compressor that is installed on a freezing system of a vehicle air conditioner and that can be driven by driving sources of electric motors built in an engine mounted on the vehicle or another driving source and a compressor, starts the compressor by the engine mounted on the vehicle or the other driving source when it is impossible or difficult to start the hybrid compressor by the electric motor, and to switch to the driving by the electric motor or adds the driving by the electric motor after a while. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a method for driving a hybrid compressor in a vehicle air conditioner including a hybrid compressor that can be driven by both a driving source of a vehicle engine or a built-in electric motor and a built-in electric motor, In particular, the present invention relates to a method for driving a hybrid compressor for a vehicle air conditioner, which can enhance the startability of the hybrid compressor.
[0002]
[Prior art]
As a compressor provided in a refrigeration system of a vehicle air conditioner, a hybrid compressor that can be driven by both a driving source of a vehicle engine or a built-in electric motor and a built-in electric motor is mainly used in terms of power saving. Attracting attention.
[0003]
For example, in Japanese Patent Application Laid-Open No. 2000-54956, a compression unit is composed of a variable displacement compressor having a swash plate type, and an electromagnetic clutch and a built-in electric motor are mounted on the same drive shaft of the compressor. Discloses a hybrid compressor capable of transmitting a driving force from a vehicle engine or a driving source mounted on the vehicle.
[0004]
In Japanese Patent Application Laid-Open No. 2000-130323, the compression unit is configured as a rotary compressor, and an electromagnetic clutch and a built-in electric motor are mounted on the same drive shaft of the compressor. There is disclosed a hybrid compressor capable of selectively transmitting a driving force from a driving source mounted on a vehicle and a driving force from an electric motor from an electric motor.
[0005]
Furthermore, although the application has not yet been published, one of the present applicants has previously divided the drive shaft of the compressor into two and has two compression units, and one of the drive shafts has an electromagnetic clutch. There has been proposed a hybrid compressor in which the other drive shaft can be selectively or simultaneously driven by an engine of a vehicle or a drive source mounted on the vehicle via an electric motor built in the compressor via a drive source mounted on the vehicle. Application 2001-280630).
[0006]
[Problems to be solved by the invention]
In the hybrid compressor for a vehicle air conditioner as described above, the electromagnetic clutch side is driven by an engine or another driving source (for example, a motor generator that performs both power generation and driving) mounted on the vehicle via a belt or the like. The other side is driven by an electric motor, but the driving force of the electromagnetic clutch side driving source is generally larger than the driving force of the other driving source mounted on the compressor. In such a structure, when the load on the compressor exceeds the driving force of the electric motor, the compressor cannot be started by the electric motor, or it becomes extremely difficult to obtain a desired startup characteristic.
[0007]
In such a case, a method of reducing the load on the compressor, for example, a method of reducing the suction pressure and the discharge pressure corresponding to the load of the compressor by adjusting other devices constituting the refrigeration system, and the like are considered. However, it takes time to reduce the pressure, and the operation becomes complicated due to the necessity of adjusting some devices, which causes problems such as a problem.
[0008]
In view of the above, an object of the present invention is to provide a method for driving a hybrid compressor for a vehicle air conditioner, which can start a predetermined compressor in a short time with a simple operation by focusing on the above problems. To provide.
[0009]
[Means for Solving the Problems]
In order to solve the above problems, a method for driving a hybrid compressor for a vehicle air conditioner according to the present invention is provided in a refrigeration system of a vehicle air conditioner and is built in a drive source and a compressor mounted on an engine or a vehicle of the vehicle. A driving method of a hybrid compressor drivable by both driving sources of an electric motor, wherein the starting of the hybrid compressor by the electric motor is impossible or difficult, and the driving source mounted on the vehicle engine or the vehicle. To start the compressor and thereafter switch to driving by the electric motor or add driving by the electric motor.
[0010]
In the driving method of the hybrid compressor for a vehicle air conditioner, the driving shaft of the compressor is the same as the hybrid compressor, and the same driving shaft is connected to a driving source and a compressor mounted on an engine or a vehicle of the vehicle. A motor driven selectively or simultaneously by both driving sources of the built-in electric motor can be used.
[0011]
Further, as the hybrid compressor, a drive shaft of the compressor is divided into two, and one of the drive shafts is driven by a drive source mounted on an engine or a vehicle of a vehicle, and the other drive shaft is driven by an electric motor built in the compressor. A motor that can be selectively or simultaneously driven by a motor can be used.
[0012]
Further, the hybrid compressor includes two compressors arranged side by side, one of which is driven by an engine of a vehicle or a driving source mounted on the vehicle, and the other of which is an electric motor built in the compressor. A motor driven selectively or simultaneously by a motor can also be used.
[0013]
In such a driving method of the hybrid compressor for a vehicle air conditioner according to the present invention, generally, the driving force of the electromagnetic clutch side driving source, that is, the driving force of the vehicle engine or the driving source mounted on the vehicle. The driving force is larger than the driving force of the electric motor, which is the other driving source with the compressor, and even if the problem described above occurs, the driving force of the electromagnetic clutch side driving source is It is set to exceed the driving force of the motor. Therefore, when it is desired to start the compressor on the electric motor side, when the load of the compression unit exceeds the driving force (starting force) of the electric motor and cannot be started or cannot be started with predetermined startup characteristics, first, on the electromagnetic clutch side, In other words, by being started by the vehicle engine or the drive source mounted on the vehicle, the refrigerant starts to circulate in the refrigeration system, and the driving load of the hybrid compressor in the refrigeration system is greatly reduced. Therefore, after the start, when the load that can be driven by the electric motor is reached, the driving is switched to the electric motor side, or in the case of simultaneous driving, the electric motor side driving is added. This allows for a smooth startup.
[0014]
In this method, complicated control such as control of other devices constituting the refrigeration system is not required, and there is no time delay due to such control, and the drive sources are simply selected in a predetermined order. With this simple method, the desired compressor can be started.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a system configuration diagram of a vehicle air conditioner to which a method according to an embodiment of the present invention can be applied. The refrigeration system 1 is provided with a hybrid compressor 4 that uses either the engine 2 as a drive source mounted on the vehicle and the electric motor 5 driven by electric power supply, or both of them as power sources simultaneously. 2 is transmitted via the electromagnetic clutch 3.
[0016]
As disclosed in JP-A-2000-54956 and JP-A-2000-130323, the drive shaft of the compressor is the same, and the same drive shaft is mounted on the engine or the vehicle of the vehicle. A drive source that is selectively or simultaneously driven by both a drive source (for example, a motor generator that performs power generation and drive) and an electric motor 5 built in the compressor can be used.
[0017]
Further, as proposed by one of the present applicants (Japanese Patent Application No. 2001-280630), the drive shaft of the compressor is divided into two, and one of the drive shafts is used as the hybrid compressor 4. Alternatively, a drive source whose other drive shaft is selectively or simultaneously driven by a drive source mounted on a vehicle by an electric motor built in the compressor may be used.
[0018]
Further, the hybrid compressor 4 includes two compressors arranged in parallel, one of which is driven by an engine of a vehicle or a drive source mounted on the vehicle, and the other of which is an electric motor built in the compressor. A motor driven selectively or simultaneously by a motor can also be used.
[0019]
The high-temperature and high-pressure refrigerant compressed by the hybrid compressor 4 having two driving sources as described above is cooled by exchanging heat with the outside air by the condenser 6, condensed and liquefied. Gas and liquid are separated by the receiver 7, and the liquid refrigerant is decompressed by the expansion valve 8. The depressurized low-pressure refrigerant flows into the evaporator 9 and exchanges heat with the air blown by the blower 12. The refrigerant evaporated and vaporized in the evaporator 9 is again sucked into the hybrid compressor 4 and compressed.
[0020]
A ventilation duct 13 through which air for vehicle interior air conditioning passes is provided with a blower 12, an evaporator 9, an air mix damper 10, and a heater core 11. Downstream of the ventilation duct 13, outlets 41, 42, 43 such as DEF, VENT, and FOOT are provided, and a predetermined outlet is selected by each damper (not shown). .
[0021]
As various sensors for air conditioning control, an evaporator outlet air temperature sensor 14 for detecting an air temperature Te after passing through the evaporator 9 is provided, and a detected signal is input to an air conditioning control device 15 for performing air conditioning control. You. Further, the air-conditioning control device 15 includes an outside air temperature Tam, a vehicle interior air temperature Tr, a heater hot water temperature Tw, a solar radiation amount Rsun, a remaining amount Bt of a battery as power supply means (detected by a power source detection means), and a vehicle speed signal. Signal groups 16 such as SP, the engine speed signal Ne, and the accelerator opening signal ACC are input. Further, an electric motor rotation speed control signal 17 and a clutch control signal 18 are output as output signals.
[0022]
The air-conditioning control device 15 also functions as a compressor drive source selection unit. When the hybrid compressor 4 is driven by the electric motor 5, the clutch 3 is turned off by the clutch control signal 18, and then the electric motor 5 The rotation speed of the electric motor 5 is controlled by giving the rotation speed control signal 17 as a duty signal. Conversely, when the compressor 4 is driven by the engine 2, the output of the rotation speed control signal 17 of the electric motor 5 is stopped, and the clutch 3 is turned on. Further, simultaneous driving by both driving sources of the engine 2 and the electric motor 5 is also possible.
[0023]
In the air conditioning control, for example, the control of the air temperature Te after passing through the evaporator 9 is performed by controlling the rotation speed of the electric motor 5 when the compressor is driven by the electric motor 5, and the on / off state of the clutch is controlled when the compressor is driven by the engine 2. This is performed by off control or compressor capacity control.
[0024]
In the vehicle air conditioner as described above, it is required to start the hybrid compressor 4 by the electric motor 5, but even if the electric motor 5 wants to start the hybrid compressor 4, the starting load of the compressor 4 is reduced. When a predetermined starting force (driving force) by the electric motor 5 is exceeded and the motor cannot be started or cannot be started with predetermined rising characteristics, first, the electromagnetic clutch 3 is turned on, and the driving force from the engine 2 is transmitted to the hybrid compressor 4. Is started. Since the driving force of the engine 2 is much larger than the driving force of the electric motor 5, the hybrid compressor 4 can be started quickly and smoothly without any problem.
[0025]
By starting the hybrid compressor 4, the refrigerant starts to be compressed and circulated in the refrigeration system 1, so that the load required for driving the compressor 4 is sharply reduced. When the hybrid compressor 4 is started and becomes a load that can be driven by the electric motor 5, the driving is switched to the electric motor 5 side. Alternatively, when simultaneous driving is required, the driving force of the electric motor 5 is added to the driving force of the engine 2.
[0026]
The start of the hybrid compressor 4 does not require complicated control such as control of other devices constituting the refrigeration system 1 and does not cause a time delay due to such control. With the simple control of simply selecting the sources in a predetermined order, the hybrid compressor 4 can be started smoothly and without any problem in a very short time. Therefore, the control of the refrigeration system 1 using the hybrid compressor 4, and thus the entire air conditioning control, can be smoothly controlled to a desired state. In addition, effects such as power saving by using the hybrid compressor 4 can be obtained without any problem.
[0027]
【The invention's effect】
As described above, according to the driving method of the hybrid compressor for a vehicle air conditioner according to the present invention, the hybrid compressor can be started to a predetermined state in a very short time with a simple operation, As a result, it is possible to obtain the effect of saving power and improving the fuel efficiency of the vehicle without any problem.
[Brief description of the drawings]
FIG.
1 is a system configuration diagram of a vehicle air conditioner to which a method according to an embodiment of the present invention can be applied.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Refrigeration system 2 Engine 3 Electromagnetic clutch 4 Hybrid compressor 5 Electric motor 6 Condenser 7 Liquid receiver 8 Expansion valve 9 Evaporator 10 Air mix damper 11 Heater core 12 Blower 13 Ventilation duct 14 Evaporator outlet air temperature sensor 15 Air conditioning control device 16 signal group 17 electric motor rotation speed control signal 18 clutch control signals 41, 42, 43 outlet

Claims (4)

A method for driving a hybrid compressor, which is provided in a refrigeration system of a vehicle air conditioner and is drivable by both a driving source of a vehicle engine or a driving source mounted on the vehicle and an electric motor built in the compressor. When it is impossible or difficult to start the hybrid compressor by the motor, the compressor is started by the engine of the vehicle or a drive source mounted on the vehicle, and thereafter, the drive is switched to the drive by the electric motor, or the drive by the electric motor is performed. A method for driving a hybrid compressor for a vehicle air conditioner, comprising: The hybrid compressor, wherein the drive shaft of the compressor is the same, and the same drive shaft is selectively provided by both a drive source mounted on the engine or the vehicle of the vehicle and an electric motor built in the compressor. Alternatively, the method for driving a hybrid compressor for a vehicle air conditioner according to claim 1, wherein the method is driven simultaneously. In the hybrid compressor, a drive shaft of the compressor is divided into two, and one of the drive shafts is driven by a drive source mounted on an engine or a vehicle of the vehicle, and the other drive shaft is driven by an electric motor built in the compressor. 2. The method for driving a hybrid compressor for a vehicle air conditioner according to claim 1, wherein said method is selectively or simultaneously driven. The hybrid compressor is composed of two compressors arranged side by side, one of which is driven by an engine of a vehicle or a drive source mounted on the vehicle, and the other of which is driven by an electric motor built in the compressor. 2. The method for driving a hybrid compressor for a vehicle air conditioner according to claim 1, wherein said method is selectively or simultaneously driven.

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