JPH01110001A - Power supply device for air conditioner for vehicle - Google Patents

Abstract

PURPOSE:To enable an air conditioner to be continuously operated even during the stopping of a vehicle, by lowering the output frequency of an inverter when the output voltage value of the inverter goes below a value corresponding with an operation continuing value. CONSTITUTION:Power generated by an axle generator 5 is stored in a storage battery 7 via a charging equipment 6. Output voltage from the storage battery 7 and the charging equipment 6 is converted to AC power by a DC-DC converter 8 and an inverter 9, and is fed to an air conditioner 10. In this case, when the voltage of the AC power of output generated from the inverter 9 goes below a set value corresponding with a value for enabling the air conditoner 10 to be continuously operated, then the output frequency of the inverter 9 is lowered. As a result, even while the vehicle is stopped, the air conditioner can be continuously operated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a power supply device for a vehicle air conditioner, and particularly to a power supply device for a vehicle air conditioner suitable for a railway vehicle having a wheel generator. It is.

[Conventional technology]

Conventionally, passenger cars have been provided with an axle generator as the wL#I that generates power from the axle by belt drive, and the power generated by the axle generator is supplied to lighting equipment and the like. This type of configuration is discussed in 1, for example, "Latest Railway Encyclopedia J, February 12, 1980, published by Seibundo Shinkosha, p. 215.In recent years, there has been a demand for improved cabin comfort. The power load of the air rI4 device was added to the 9th passenger car.Therefore, since the capacity of the axle generator as mentioned above was insufficient, the D-G-1, which combines a diesel engine and a generator, was installed.
! - Will it be equipped as a power supply vehicle (centralized type)?

Either equip every few cars with a D-G set that covers the above load (semi-centralized type), or use an axle generator to directly drive the compressor of the air conditioner, or use a DC motor to drive the compressor of the air conditioner. It was either to use it or not.

[Problems that the invention attempts to solve]

In the above conventional technology, when the vehicle is running, air conditioning is performed as the axle rotates! Ii! However, since the axle is not rotating while the vehicle is stopped, there is a problem in that the air conditioner is not driven and the comfort in the cabin is impaired. Further, in a configuration including an open type compressor powered by a DC motor using a power source consisting of an axle generator and a storage battery, there is a risk that refrigerant leaks and maintenance becomes complicated.

The object of the present invention is to operate an air conditioner using electric power obtained from an axle generator.
A power source for a vehicle air conditioner that allows the air conditioner to continue operating even when the vehicle is stopped! The purpose is to provide tl location.

[Means for solving problems]

The above object is to provide an axle generator driven by the rotational force of the axle, a photoelectric device that charges a storage battery with the electric power generated by the axle generator, and a power supply means consisting of the axle generator Ia, a charger, and a storage battery. An inverter that converts DC power into AC power and supplies power to the air conditioner, and a controller that reduces the output frequency of the inverter when the voltage value of the power supplied from the inverter to the air conditioner falls below a value corresponding to a continuous operation value. [Function] By the power supplied by the power supply means.

Air conditioning via an inverter! However, when the vehicle is stopped, the air conditioner is operated using electricity from the storage battery. At this time, by giving priority to control based on the output voltage of the inverter over control based on the air conditioning load of the air conditioner, the operation of the air conditioner can be continued.

〔Example〕

An embodiment according to the present invention will be described below with reference to FIGS. 1 to 3. In the figure, 1 is the axle.

Reference numeral 2 designates a pulley attached to the axle 1, and 3 designates a belt that is connected to the pulley 2 on one side, and to the pulley 4 on the other side. Reference numeral 5 designates an axle generator provided correspondingly to the axle 1, to which the pulley 4 is attached. Reference numeral 6 denotes a charger for charging the storage battery 7 with electric power generated by the M-distributed axle generator. 8 is a DC-DC for boosting the voltage of the power supplied from the charger 6 or the storage battery 7 to a predetermined value.
A converter 9 is an inverter for converting the boosted DC voltage output from the DC-DC converter 8 into an AC voltage. Reference numeral 10 denotes an air conditioner driven by AC power output from the inverter 9, and the compressor forming the refrigeration cycle is of a completely hermetic type with a built-in electric motor. (2) detects the voltage of the AC power output from the inverter 9, and determines that the voltage detection result has fallen below a set value that allows the air conditioner 111G to continue operating; This is a controller that outputs a command to the inverter 9 to lower the output frequency of the inverter.

In such a configuration, the operating status is explained as follows.
The rotation of the axle 1 changes from no rotation when stopped to high speed rotation when running at maximum speed (assuming the wheel diameter is 8601 El and the speed is 1001 m/h, the rotational image of the axle 1 is approximately 62 Orpm). This rotation of the axle l drives an axle generator 5 via the pulleys 2 and 4 and the belt 3. Electric power generated by the axle generator 5 is stored in a storage battery 7 via a charger 6. Since the air conditioner 710 is driven using the output voltage (VA) from the storage battery 7 and the charger 6, constant and stable DC power can be supplied despite fluctuations in the rotational speed of the axle l. However, this DC power is, for example, DC2
Since it is a low voltage such as 4V or DC48V, it cannot drive AC motors used for air conditioners.

Therefore, a DC-DC converter 8 is used to boost the DC power. The DC power thus obtained is further converted into current power by the inverter 9, and serves as a power source for driving the air conditioner tIO. Note that the DC-D
Although the C converter 8 is used as a stage of the inverter 90, the DC-DC converter 8 may be omitted and a transformer may be used after the W inverter 9, but the DC-DC converter 8 or the transformer may be It depends on the voltage VA and the characteristics of the inverter 9, and can be omitted depending on the characteristics of the inverter 9.

By obtaining AC power from the inverter 9 in this way, an AC motor can be used as the motor for the air conditioning bag 5110 to be driven. Air conditioner 1 due to the second thing
The compressor of 110 can be of a completely hermetic type.

Furthermore, by obtaining AC power through the inverter 9, the air conditioner 10 can continue to operate even when the vehicle is stopped. That is, the axle generator 5
．． The voltage VA of the power finally supplied to the air conditioning bag [10 by the power supply means consisting of the charger 6 and the storage battery 7 is detected by the voltage detection means built into the controller 11 and constantly monitored. The relationship between the detection result of the voltage detection means and the air-conditioning heat load Q is as shown in the second layer, and as the air-conditioning heat load Q increases, the voltage V
The cloud descends. When this drop in the voltage Vm is detected and the voltage Vm becomes less than a predetermined set value Vo, the output frequency f1 of the inverter 9 is changed from that value regardless of the air conditioning heat load, as shown in FIG. is also lowered to a lower frequency f2. This reduces the power consumption associated with the operation of the air conditioner I 10, allowing the air conditioner 10 to continue operating without stopping. Note that the set value Vo
is the voltage value required to continue the operation of the air conditioner 10 in relation to the output frequency f of the inverter 9.

Therefore, the set value Vo may be changed depending on the above-mentioned conditions, or may be fixed at the lowest value. By the way, the above-mentioned control is performed within the capacity of the power supply means, and if a load exceeding the capacity acts, the operation of the air conditioner 110 must be stopped.

According to such a configuration, even when the vehicle is stopped and the axle power generation unit 4115 is not generating electricity, the air conditioning bag ff110 can continue to operate, improving service to passengers. I can figure it out.

In addition, since the power supply means is DC and the DC power supplied is converted into AC power by the inverter 9 and used, the motor used for the compressor of the air chamber 5110 can be an AC motor, and is completely sealed. An air conditioning system using a type compressor can be adopted. With these two methods, refrigerant leakage in the air conditioner 110 can be completely prevented, so maintenance and inspection can be simplified.

〔Effect of the invention〕

As explained above, according to the present invention, the air conditioner can continue to operate even when the vehicle is stopped.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram showing an embodiment of the power supply device for air conditioners according to the present invention, Fig. 2 is a graph showing the relationship between air conditioning heat load Q and detected voltage vA, and Fig. 3 is the output frequency f of the inverter.
It is a graph which shows the relationship between and detection voltage VA. 5... Axle generator, 6... Charger, 7
...1 storage battery, 8...DC-DC converter,
9...Inverter, 10...Air conditioner
. Agent: Patent attorney Katsuo Ogawa. Second prisoner cuff 11;

Claims (1)

[Claims] 1. An axle generator driven by the rotational force of the axle, a charger that charges a storage battery with the power generated by the axle generator, and DC power from a power supply means consisting of the axle generator, charger, and storage battery. an inverter that converts the AC power into AC power and supplies power to the air conditioner, and a controller that reduces the output frequency of the inverter when the voltage value of the power supplied from the inverter to the air conditioner falls below a value corresponding to a continuous operation value. A power supply device for a vehicle air conditioner, characterized in that: