JPH0137305B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner for a railway vehicle, and more particularly to a method and device for controlling the air conditioner for a vehicle, which is suitable for linking to the operating mode of the vehicle and the load status of the ground power source. be.

As shown in FIG. 1, a conventional railway vehicle air conditioner includes a compressor 1, a condenser 2, a pressure reducing mechanism 3, an evaporator 4,
It is composed of a condenser blower 5 and an evaporator blower 6, and their operation is generally controlled ON-OFF by a thermostat installed inside the vehicle. On the other hand, looking at the operation modes of the vehicle, as shown in Figure 2, power running (driving by driving the traveling motor, i.e. acceleration state) A, coasting (driving by inertia without driving the traveling motor) B, braking (decelerating state) It consists of C and stop D. The power consumption at that time is shown in FIG. 3.
That is, since the electric power required for vehicle running is only in the power running section, it is shown as a solid line, and the operating electric power of the air conditioner is added to this as shown by the diagonal line within the dotted line. Therefore, in the power running section A, the sum of both powers becomes the sum, and the peak power becomes large. If the peak power increases in this way, the capacity of above-ground substation equipment must be increased, which is uneconomical.

As vehicle operation and air conditioner operation were controlled separately and independently in this way, the power running of two or more trains happened to overlap within the same substation section, and moreover, the power running and air conditioning operations overlapped. The drawback was that the peak power would become even larger, requiring reinforcement of ground power equipment. Also,
Even if there was sufficient ground power supply equipment, power contracts were determined based on peak power, which had the disadvantage that customers would end up paying more for power.

In view of the above points, it is an object of the present invention to prevent an increase in peak power in each substation section and to prevent an increase in the capacity of substation equipment.

The present invention detects the amount of power consumption within the substation section while the vehicle is traveling, and when the amount is about to exceed a preset peak amount of power, forcibly stops the operation of the air conditioner, The other feature is that the increase in peak power in each substation section is suppressed by performing thermostatic operation.

An embodiment of the present invention will be explained with reference to FIGS. 4 and 5. 11 is a thermostat that opens and closes an electric circuit for controlling the air conditioner according to the level of room temperature;
2 is a relay that is operated by opening and closing the thermostat 11; 13 is an electromagnetic switch that is operated by the relay 12 and starts and stops the compressor 14;
These diagrams show control circuits in conventional air conditioners. 15 is a motor generator for converting direct current supplied from the overhead wire 16 into alternating current and supplying it to the air conditioner; 17 is a voltage interlocking switch that detects the primary side voltage of the motor generator 15 and opens/closes it; and 18 is a A relay is operated by opening and closing a voltage interlocking switch 17, 19 is an electromagnetic switch operated by relay 18, and 20 is a timer.

Next, the operation of this embodiment will be explained.
When two or more trains are running simultaneously in the same substation section and power consumption increases, the overhead wire voltage in that section drops. Then, the primary voltage of the motor generator 15 mounted on the vehicle will drop, which will be detected and the voltage interlocking switch 1 will be switched on.
7 is released. When the voltage interlocking switch 17 is opened, the relay 18 is operated and the electromagnetic switch 19 is opened. When the electromagnetic switch 19 is opened, the relay 12 operates independently of the thermostat 11.
The electromagnetic switch 13 is opened and the compressor 14 is stopped.

Note that the timer 20 is used to prevent the control circuit from being energized for a certain period of time once the voltage interlocking switch 17 is opened. This prevents the compressor 14 from restarting. That is, generally the compressor 14 of an air conditioner
When the compressor 14 is stopped, the discharge side pressure Pd and the suction side pressure Ps of the compressor 14 change as shown in FIG. and,
If the difference between Pd and Ps becomes small to some extent (τ after ₁ hour)
A reboot is possible. The value of τ ₁ changes depending on the characteristics of the air conditioner and compressor 14. Therefore, the timer 20 may be set for a period longer than τ ₁ hour in accordance with the characteristics of the air conditioner or the compressor 14.

According to such a configuration, when the power consumption within each power station section is about to exceed a preset value, a drop in the overhead wire voltage is detected and the air conditioner is stopped, thereby preventing an increase in peak power. By the way, in the description of the above embodiment, the motor generator 15 is used as a means for detecting an increase in power consumption.
We have described the case of detecting the primary voltage of
In particular, the detection is not limited to the primary voltage of the motor generator 15, but may be detected using the primary voltage of other equipment.In short, the same effect can be obtained as long as the drop in the overhead line voltage can be detected.

FIG. 6 is a circuit diagram showing another embodiment of the present invention,
Identical parts are given the same reference numerals as in Fig. 4. In the figure, 21 is an air spring of the truck, 22 is a load switch that detects the number of passengers by the air spring 21 and opens the circuit when the number of passengers exceeds a certain level, and 23 is a load switch that is linked to the drive of the vehicle's travel motor. This is an acceleration-linked switch that opens and closes the control circuit (that is, the switch opens when the travel motor is driven during power running, and closes when the motor is stopped).

In other embodiments of the present invention, when a passenger rides beyond a preset limit, it is detected by the air spring 21 and the load switch 22 is opened. Further, the acceleration interlock switch 23 is opened for a while after the vehicle starts running from a stop, that is, when the running motor is running, the acceleration or the energization state of the motor is detected.
Then, when the load switch 22 and the acceleration interlocking switch 23 are opened simultaneously, the relay 18 is operated and the electromagnetic switch 19 is opened. Electromagnetic switch 1
9 is opened, the relay 12 is operated independently of the thermostat 11, the electromagnetic switch 13 is opened, and the compressor 14 is stopped. That is, the original purpose is to control the power consumption within the same substation section so that it does not exceed a certain limit, but this embodiment attempts to detect this indirectly. That is, since power consumption within the same substation section increases during morning and evening rush hours when the number of trains within the same section increases, this is indirectly detected by the load switch 22. Therefore, the load switch 22 and the acceleration interlocking switch 23 are opened at the same time only when powering during lashing, and the operation of the air conditioner is forcibly stopped.

According to such a configuration, the peak power consumption within each substation section can be suppressed, especially during rush hours in the morning and evening, and there is no need to configure a high voltage circuit in the detection circuit, simplifying the circuit configuration. can be converted into

As explained above, according to the present invention, by directly or indirectly detecting the drop in overhead line voltage and controlling the operation of the air conditioner, it is possible to prevent an increase in the peak power amount within each substation section. It is possible to prevent the capacity of substation equipment from increasing, and to save power costs if the power costs are determined based on peak power.

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing the refrigeration cycle, Figure 2 is a graph showing vehicle operation modes, and Figure 3 is the power required when driving a vehicle equipped with a conventional air conditioner and operating the air conditioner at the same time. FIG. 4 is a circuit diagram showing an embodiment of the control device for an air conditioner according to the present invention; FIG. 5 is a graph showing changes in pressure on the discharge side and suction side of the compressor after operation is stopped; FIG. 6 is a circuit diagram showing another embodiment of the control device for an air conditioner according to the present invention. 11... thermostat, 12, 18... relay, 14... compressor, 16... overhead wire, 17... voltage interlocking switch, 19... electromagnetic switch, 20...
Timer, 22...load switch, 23...acceleration interlocking switch.

Claims (1)

[Scope of Claims] 1. In an air conditioner for a railway vehicle that is driven by an electric motor and runs, the air conditioner is configured to detect an overhead wire voltage and control the operation of the air conditioner to reduce power consumption when the voltage drops below a predetermined value. A method for controlling an air conditioner for a railway vehicle. 2. In an air conditioner for a railway vehicle that is driven by an electric motor and runs, there is a detection means for detecting overhead wire voltage, and a system that reduces power consumption when the main power supply of the air conditioner is turned on when the detected voltage of the detection means is lower than a set value. A control device for an air conditioner for a railway vehicle, comprising a control means for controlling the air conditioner. 3. In claim 2, the detection means is a voltage detector that detects the primary side voltage of electrical equipment in a railway vehicle, and the control means compares the detected voltage of the voltage detector with a set value, and A control device for an air conditioner for a railway vehicle, characterized in that the control means is a switch provided in the main power source of the air conditioner.