JPS62169952A - Air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To be able to save energy by carrying out the variable speed operation of an air conditioner with an inverter operated on the basis of data concerning a temp. in a vehicle, the number of passengers, and opening and closing signals from a gateway door in the vehicle fed to a control device. CONSTITUTION:For example, even if a temp. in a vehicle becomes highest, a detector 7 for opening and closing of a gateway door detects the opening of the door or a load detector 8 finds out that a number of passengers enter a vehicle and then an inverter operation command is put out immediately from an operational circuit and an inverter 2 is controlled by an operation control circuit to increase the operation speed of an air conditioner 3. On the contrary, when the detector 7 finds out the opening and closing of the door and the detector 8 finds out that the passengers leave out the vehicle, a command to reduce the operation speed of the conditioner 3 is fed to the inverter 2 from a controller 4. The operation adjustment of the conditioner 3 or an inverter operation frequency comes near an intermediate frequency and the condition for the operation adjustment is computed on the basis of vehicle temp. and the number of the passengers by the operational circuit to feed to the operation control circuit.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention uses the output of a power conversion device as a power source to control the temperature inside the vehicle to the optimum temperature, and to control the driving pattern so that it is the most energy-saving. The present invention relates to air conditioners for vehicles.

C. Prior Art] Figures 5 to 8 are, for example, disclosed in Japanese Patent Application Laid-Open No. 56-2501.
FIG. 5 is a block diagram of the vehicle air conditioner, and FIG. 6 is a cross-sectional view of the vehicle showing the arrangement of the detectors. , FIG. 7 is a block diagram showing details of the control device, and FIG. 8 is a graph showing the inverter operating frequency.

First, in FIG. 5, ■ is a pantograph that collects current from an overhead wire (not shown), 2 is an inverter that converts the power input from the pantograph 1, and the output of this inverter 2 is used to control the air conditioner 3. I'm trying to drive it.

The operating state of this inverter 2 is controlled by a control device 4. The control device 4 includes temperature detectors 5 and 6.
is connected. Temperature detection signals are input from these temperature detectors 5.6.

As is clear from FIG. 6, the temperature detector 5 is placed near the suction port of the air conditioner 3.
is arranged near the floor inside the vehicle 9. The control device 4 controls the operating state of the inverter 2 based on the temperature detection signals from the temperature detectors 5 and 6. The detection signal is input to a temperature difference detection circuit 10. The output of this temperature difference detection circuit 10 is the arithmetic processing circuit I
It is configured to send to I.

The output of the set temperature storage circuit 13 is also input to the arithmetic processing circuit 1, and a signal corresponding to the difference between this output and the output of the temperature difference detection circuit 10 is output to the operation control circuit 12. That's what I do.

The output of this operation control circuit 12 is used to control the operation of the inverter 2.

Next, the operation will be explained. In the conventional air conditioner, the output of a temperature difference detection circuit 10 that detects the temperature difference inside the car and the temperature setting inside the car stored in advance in the set temperature storage circuit 11 are determined based on the detection signals of the temperature detectors 5 and 6. Depending on the value, the arithmetic processing circuit 1 is activated to calculate the optimum temperature inside the vehicle.

That is, a value proportional to the temperature difference detected by the temperature difference detection circuit 10 is subtracted from the temperature setting value, and this value is calculated by the arithmetic processing circuit 1.
1 output. This takes advantage of the fact that when there are few passengers, the temperature difference between the temperature detectors 5 and 6 is small, and when there are many passengers, the temperature difference is large, so that the arithmetic processing circuit 11 The value is calculated.

In order to achieve the optimum temperature calculated in this way, an operation command is given to the inverter 2 from the operation control circuit 12, and the inverter 2 varies the operating frequency as shown in FIG.
Variable speed operation was performed, and the air conditioner 3 was driven so that the inside of the vehicle reached the optimum temperature output by the arithmetic processing circuit 11.

[Problem that the invention seeks to solve]

Since the conventional air conditioner is configured as described above, the operation command to the inverter 2 depends only on the temperature of the air inside the vehicle.

However, since air has a large heat storage effect, even if you operate the air conditioner to cool the car, the temperature inside the car does not drop immediately, and there is a so-called dead time in which it takes a certain amount of time to reach the set temperature. was.

Therefore, even if variable speed operation is performed using the inverter 2,
As shown in Fig. 8, the inverter 2 is immediately operated at the maximum frequency, and once it cools down, it immediately enters the lowest frequency operation, that is, the same state as on-off operation, and cannot operate continuously at the intermediate frequency. , the energy saving effect of variable speed operation of the inverter 2 could not be expected.

The present invention has been made to solve these problems, and an object of the present invention is to provide a vehicle air conditioner that enables continuous variable speed operation of the inverter and is highly energy-saving.

Means for Solving Problem c] The vehicle air conditioner according to the present invention uses, as the inverter operation command, not only the air temperature inside the vehicle, but also the number of passengers, which affects the temperature inside the vehicle, and the opening and closing of the entrance/exit door inside the vehicle. The apparatus is provided with a detecting means and a control means for controlling the operation of the inverter using the output of the detecting means.

[For production]

In this invention, the air temperature inside the car, the number of passengers, and the opening/closing signal of the entrance/exit door inside the car are input to the control device, and the control device gives an operation command to the inverter based on these inputs.
The inverter operates the air conditioner at variable speed.

〔Example〕

Embodiments of the vehicle air conditioner according to the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of one embodiment, and corresponds to FIG. 5 of the conventional example. In FIG. 1, parts that are the same as those in FIG. 5 are given the same reference numerals, and the parts that are different from those in FIG. 5 will be mainly explained.

As is clear from comparing Figure 1 with Figure 5,
In the figure, an entrance/exit door opening/closing detector 7 inside the vehicle and a load detector 8 for detecting the floor load caused by passengers are newly added to the configuration shown in FIG.
It has been added. These entrance/exit door opening/closing detector 7 and load detector 8 are connected to the control device 4.

As is clear from the cross-sectional view of the vehicle in FIG. 2, the entrance/exit door opening/closing detector 7 is attached to the outside of the vehicle 9, and the load detector 8 is disposed at the bottom of the vehicle 9.

FIG. 3 is a block diagram showing the structure of the control bag W4. In FIG. 3, the outputs of a temperature device 5 placed near the air intake of the air conditioner and a temperature detector 6 placed near the floor of the car are input to an arithmetic processing circuit 10. However, the output of the entrance/exit door opening/closing detector 7 is input to a door opening/closing detection circuit 14. Further, the output of the load detector 8 is input to a passenger number detection circuit 15. This passenger number detection circuit 15 detects the number of passengers based on the floor load.

The arithmetic processing circuit 11 includes a temperature difference detection circuit 10°, a set temperature storage circuit 13. Door opening/closing detection circuit 140 Number of passengers detection circuit 1
5 output is input. Other configurations are the same as before.

Next, the operation of this invention will be explained. Temperature detector 5
．． The process of processing the output signal No. 6 and calculating the optimum temperature inside the vehicle is the same as the conventional one.

The biggest factors that affect the air temperature inside a car are the inflow of outside air due to opening of the entrance/exit door and the number of passengers. That is,
The temperature inside the car increases due to the inflow of outside air when the entrance/exit door is opened, and the temperature inside the car changes when a large number of passengers suddenly get on and off the train during rush hours.

As mentioned above, there is dead time when controlling the air temperature, so if we were to capture the changes in the interior temperature due to changes in these factors, temperature control would not be able to be done in time, and the inverter would not be able to turn on or off. Although it becomes a state,
In the invention, the change in the factor itself is captured and used as an inverter operation command.

For example, even if the inside of the vehicle has reached the optimum temperature, if the door opening/closing detector 7 detects that a door is opened or if the load detector 8 detects that a large number of passengers are boarding, the inverter operation command is immediately sent to the arithmetic processing circuit 11. The operation control circuit 12 controls the inverter 2 to increase the operation of the air conditioner 3.

Conversely, the entrance/exit door opening/closing detector 7 detects that the entrance/exit door is open,
When the load detector 8 detects that a passenger gets off the vehicle, the air conditioner 3
The control device 4 issues a command to the inverter 2 to weaken the operation.

The control of the operation of the air conditioner 3, that is, the inverter operating frequency, is around the intermediate frequency as shown in FIG.
At this time, depending on the temperature inside the car and the number of passengers, the calculation processing circuit 11
is calculated and output to the operation control circuit 12.

〔Effect of the invention〕

As explained above, this invention controls the inverter operation based on the factors that change the temperature inside the car to drive the air conditioner, so there is no wasted time in temperature control and the impark operation frequency It is possible to operate continuously near the intermediate frequency, resulting in significant energy savings and lower power consumption compared to the conventional on/off operation.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the vehicle air conditioner of the present invention, and Fig. 2 is a cross section of a vehicle showing the arrangement of a temperature detector, an entrance/exit door opening/closing detector, and a load detector in the same vehicle air conditioner. Figure 3 is a block diagram showing the detailed configuration of the control device in the vehicle air conditioner as above, and Figure 4 is a block diagram showing the detailed configuration of the control device in the vehicle air conditioner.
The figure shows a graph of the operating frequency of the inverter in the vehicle air conditioner shown above, Figure 5 is a block diagram of a conventional vehicle air conditioner, and Figure 6 is temperature detection in the vehicle air conditioner shown in Figure 5. Vehicle cross-sectional view showing the arrangement of the containers, No. 7
This figure is a block diagram showing a detailed configuration of the control device in the vehicle air conditioner shown in FIG. 5, and FIG. 8 is a diagram showing a graph of the operating frequency of the inverter in the vehicle air conditioner shown in FIG. 5. 1... Pantograph, 2... Inverter, 3...
Air conditioner, 4... Control device, 5.6... Temperature detector, 7... Entrance/exit door opening/closing detector, 8... Load detector, 9... Vehicle. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] an inverter that operates an air conditioner by varying the operating frequency; a plurality of temperature detectors that detect temperatures at predetermined locations on a vehicle; an entrance/exit door opening/closing detector that detects opening/closing of an entrance/exit door of the vehicle; For vehicles, comprising: a load detector that detects the load due to the number of passengers in the vehicle; and a control device that controls the operation of the inverter based on the detection signals of the temperature detector, entrance/exit door opening/closing detector, and load detector. Air conditioner.