JPH053601A - Power supply for refrigerated vehicle - Google Patents

Abstract

PURPOSE:To enhance reliability of operation by connecting an auxiliary machine for vehicle to the output side joint of first and second DC-DC converters producing approximate voltages thereby sustaining travel of vehicle even upon failure of the first DC-DC converter. CONSTITUTION:An induction motor 1 for running a vehicle enters into regenerative state to produce AC power which is then rectified through an inverter 2 and smoothed 3 and thus obtained DC power is subjected to voltage conversion 7 to produce DC power of 96V, for example, for charging a battery 8. The battery voltage is converted through a DC-DC converter 9 into a DC 28V voltage which is then fed to auxiliary machines such as headlights, starter motor and radio. On the other hand, DC 96V voltage is boosted 12 to 280V voltage which is inverted through an inverter 14 into VVVF voltage for driving a refrigerator compressor motor 17. Furthermore, DC 280V voltage is converted through a DC-DC converter 15 into 28.5V voltage for driving the refrigerator load and the 28.5V voltage is also connected through a diode 19 with the output of the converter 9. According to the constitution, the vehicle can sustain traveling even upon failure of the converter 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention In a refrigeration vehicle, the present invention can be used for running a vehicle even if a DC-DC converter for voltage conversion for supplying electric energy stored in a battery to a vehicle auxiliary device fails. The present invention relates to a power supply device for a refrigeration vehicle having a unique configuration.

[0002]

2. Description of the Related Art Heretofore, an induction machine has been attached to a power line so that the AC power generated by the induction machine when the vehicle is braked is exchanged with the DC power to be supplied to a battery and stored in the battery when the vehicle is accelerated. There has been proposed a system (electric braking and auxiliary drive device) configured to take out the electric energy, convert it into an alternating current, and supply it to the induction machine to assist the wheel drive (for example, Japanese Patent Laid-Open No. 63-63). No. 206101).

FIG. 2 is a circuit block diagram showing an example of the above conventional system.

When the induction machine 1 attached to the power line is used as a generator, the electric power generated by the induction machine 1 is converted into direct current by the inverter circuit 2. Here, the capacitor 3 is for smoothing. The electric power converted into this value flow is converted into 96 VDC by the voltage conversion circuit 7 including the chopper 4, the diode 5 and the coil 6 and stored in the battery 8. As a result, regenerative braking is performed when the vehicle is being braked. When the vehicle is accelerated or started, the induction machine 1 is used as an electric motor, the electric power stored in the battery 8 is taken out, boosted by the voltage conversion circuit 7, converted into AC by the inverter circuit 2, and input to the induction machine 1. As a result, driving assistance for acceleration and starting is performed. Further, the electric power accumulated in the battery 8 is converted into 28.0 VDC by the DC-DC converter 9 for vehicle accessories, and vehicle accessories such as a starter motor, ampere meter, thermometer, headlight, radio, air conditioner, etc. Is supplied to.

The electric power stored in the battery 8 is boosted by a boosting circuit 12 composed of a coil 10 and a chopper 11, and is fed to an inverter circuit 14 and a DC-DC converter 15 for a refrigerator load via a backflow prevention diode 13. Is entered. Here, the capacitor 16 is for smoothing. The electric power input to the inverter circuit 14 is converted into alternating current by the inverter circuit 14 and supplied to the refrigerator compressor electric motor 17.

The electric power input to the refrigerator load DC-DC converter 15 is supplied to the DC-DC converter 1.
After being stepped down to 28.5 VDC by No. 5, it is supplied to a refrigerator load such as a refrigerator control circuit and a refrigerator fan.

[0007]

In the system constructed as described above, if the vehicle accessory DC-DC converter 9 fails, electric power cannot be supplied to the vehicle accessory and the vehicle cannot run. There was a problem.

In view of the above circumstances, the present invention is a vehicle auxiliary equipment D
An object of the present invention is to provide a circuit for a refrigerating vehicle in which the reliability of operation is improved by allowing the vehicle to travel at a minimum even if the C-DC converter fails.

[0009]

A power supply device for a refrigerating vehicle according to the present invention for achieving the above object stores an induction machine connected to a main shaft of an internal combustion engine and electric energy regenerated by the induction machine. A battery and AC power generated by the induction machine when the vehicle is braked are converted to DC power and supplied to the battery, and electric energy stored in the battery is taken out when the vehicle is accelerated and converted to AC to induce the induction. A first inverter circuit to be supplied to the machine, a first DC-DC converter for extracting and converting the electric energy stored in the battery to supply it to a vehicle auxiliary machine, and the electric energy stored in the battery. The second inverter circuit that takes out and converts it into alternating current and supplies it to the electric motor for driving the compressor of the refrigerator, and the electric energy stored in the battery. A second DC-DC converter for extracting and converting the voltage of the rugie and supplying it to the refrigerator load, wherein the first DC-DC converter and the second DC-DC converter have the same or similar voltages. The vehicle accessory outputs electric power, and is connected to a connection point where the output side of the first DC-DC converter and the output side of the second DC-DC converter are connected to each other. It is a thing.

[0010]

In the power supply device for a refrigerating vehicle of the present invention, the output side of the first DC-DC converter and the output side of the second DC-DC converter that output the same or similar voltages are connected to each other, and the connection thereof is made. Since the vehicle accessory is connected to the point, even if the vehicle accessory DC-DC converter (first DC-DC converter) fails, the refrigerator DC-
Electric power is supplied to the vehicle auxiliary device via the DC converter (second DC-DC converter). Therefore, even if the first DC-DC converter fails, the vehicle can run and the reliability of operation is improved.

[0011]

1 is a circuit diagram showing the configuration of a refrigerating vehicle according to an embodiment of the present invention. Elements corresponding to those of the circuit of the conventional example shown in FIG. 2 are denoted by the reference numerals used in FIG. 2, and description thereof will be omitted.

In the apparatus shown in FIG. 1, a DC-
A backflow prevention diode 1 is provided on the output side of the DC converter 15.
9 is connected. The cathode of the diode 19 and the output side of the vehicle auxiliary machine DC-DC converter 9 are connected to each other, and electric power is supplied to the vehicle auxiliary machine through this connection point 20.

Therefore, even if the vehicle accessory DC-DC converter 9 fails, the refrigerator DC-DC converter 15
Power will be supplied to the vehicle auxiliary equipment via the.
Therefore, even if the vehicle accessory DC-DC converter 9 fails, the traveling of the vehicle is ensured and the reliability of vehicle operation is improved.

[0014]

As described in detail above, in the power supply device for a refrigerating vehicle of the present invention, the first DC-device for the vehicle auxiliary equipment is used.
The DC converter and the second DC-DC converter for the refrigerator load output electric power having the same or similar voltages, and the output sides of these two converters are connected to each other, and via the connection point. Since it is configured to supply power to the vehicle accessory, the first DC-D
Even if the C converter fails, electric power is supplied to the vehicle auxiliary device via the second DC-DC converter, and thus the vehicle operation is ensured even if the first DC-DC converter fails. ..

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an electrical configuration of a refrigeration vehicle according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an electrical configuration of a refrigeration vehicle including a conventional electric braking and auxiliary drive device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 induction machine 2 inverter circuit 7 voltage conversion circuit 8 battery 9 DC-DC converter for vehicle accessories 12 booster circuit 14 inverter circuit 15 DC-DC converter for refrigerator load 17 electric motor for refrigerator compressor 18, 19 diode for backflow prevention 20 Connection point

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Suzuki, 1-1, Hinodai, Hino City, Tokyo Hino Motors Co., Ltd. Hino Factory

Claims (1)

Claim: What is claimed is: 1. A first DC for extracting electric energy stored in a battery, converting it into a voltage, and supplying the voltage to an auxiliary machine for a vehicle.
-A DC converter and a second DC-DC converter for extracting the electric energy stored in the battery and converting the voltage to supply it to a refrigerator load.
-The DC converter and the second DC-DC converter output electric power having the same or similar voltages to each other, and the vehicle auxiliary machine includes the output side of the first DC-DC converter and the output side of the first DC-DC converter. Second DC-
An electric power supply device for a refrigerating vehicle, characterized in that the output sides of the DC converters are connected to connection points connected to each other.