JPH0512216U - Vehicle refrigeration equipment - Google Patents

Abstract

(57) [Summary] [Purpose] An object of the present invention is to provide a vehicle refrigeration system in which switching of a power supply circuit is prevented even when a commercial power supply is turned on while being driven by a DC power supply. [Configuration] In the drive circuit of the AC motor 21 having the DC electromagnetic contactor 39 having the auxiliary contact 45, the protection relay 43 is connected between the coil 41 of the electromagnetic contactor 39 and the outlet 27 connected to the commercial power supply. When driven by a DC power supply, this protection relay prevents the circuit drive state from being switched even if a commercial power supply is turned on, and when driven by a commercial power supply, a DC electromagnetic contactor 39 The auxiliary contact 45 is used to prevent switching to the DC side.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a vehicle refrigeration system, and more particularly to a vehicle refrigeration system in which a vehicle-mounted refrigeration cycle is selectively driven by an on-vehicle DC power source and an external commercial power source.

[0002]

[Prior Art]

 Vehicles equipped with refrigeration systems are used for transporting fresh food products while maintaining high freshness. In such a vehicle, a large freezer compartment is mounted at the position where the truck bed is attached, and the freezer compartment is kept at a low temperature by a refrigeration cycle.

Such a refrigeration cycle is adapted to be driven by a DC power source mounted on the vehicle while the vehicle is traveling. However, when such a vehicle is transported by car ferri, the engine cannot be driven, so it must be driven by an external commercial power source. Therefore, such a refrigeration cycle is usually driven selectively by an on-vehicle DC power source and an external commercial power source.

[0004]

[Problems to be solved by the device]

 In such a vehicle, the DC power supply on the vehicle side must be used as described above, and if necessary, the DC power supply on the vehicle side must be disconnected so that the commercial power supply can be used. However, if the commercial power supply is accidentally turned on while the circuit is composed of the DC power supply on the vehicle side, the DC electromagnetic contactor provided in the compressor drive circuit operates and the circuit is switched to the commercial side. Otherwise, it may lose its function as a frozen controller. The same inconvenience as described above may occur if the power to both sides of the vehicle is accidentally turned on while using the commercial power source.

The present invention has been made in view of the above problems, and even if one of the on-vehicle DC power supply and the external commercial power supply is driven while the other is turned on, the drive circuit It is an object of the present invention to provide a vehicle refrigeration system in which the switching of the vehicle is prevented.

[0006]

[Means for Solving the Problems]

 The present invention relates to a vehicle refrigeration system in which a refrigeration cycle mounted on a vehicle is selectively driven by an on-vehicle DC power source and an external commercial power source, and a relay is connected to a drive circuit of the refrigeration cycle, The relay prevents the circuit from being switched when one of the on-vehicle DC power supply and the external commercial power supply is driven and the other is turned on.

[0007]

[Action]

 Therefore, if one of the on-vehicle DC power supply and the external commercial power supply is driven while the other is turned on, the relay prevents switching of the circuit, which allows the on-vehicle power supply. The drive state of one of the DC power source and the external commercial power source will be maintained.

[0008]

【Example】

 FIG. 1 shows a state in which a refrigerating compartment of a vehicle equipped with a vehicle refrigerating apparatus according to an embodiment of the present invention is removed, and a front end side of a frame 10 and a lower side of a cab 11 have an engine 12 are provided. An AC generator 13 is provided behind the engine 12 and in the flywheel housing. This generator 13 constitutes a retarder, and by exciting it, it absorbs the work from the outside and generates a braking force. The output of the generator 13 is consumed by the resistor 14 and charged in the battery 15. Further, a condensing unit 16 for freezing a freezing compartment provided in this vehicle is attached to a side portion of the frame 10.

As shown in FIG. 2, the condensing unit 16 includes a condenser 19, a compressor 20, and an AC motor 21 that drives the compressor 20. The compressor 20 circulates a cooling medium between the condenser 19 and the evaporator 22 so that the heat in the freezing compartment is discharged to the outside.

Next, the controller of the condensing unit 16 will be described. As shown in FIG. 2, this controller is operated by any one of a three-phase commercial power source taken out by the battery 15 which is an on-vehicle DC power source and the outlet 27. Can be driven. The battery 15 is connected to the boost chopper 25, and the chopper 25 is connected to the main / sub switching device 26. The outlet 27 is connected to the main / sub switching device 26 via a rectifier 28.

The switching device 26 is connected to an inverter 29, and is configured to convert a DC power supply or a rectified output into an AC and supply the AC motor 21.

The main / sub switching device 26 is connected to a DC / DC converter 31, and this converter 31 is also connected to a relay 30 so that the relay 30 switches refrigeration intensity. The DC / DC converter 31 is connected to the system controller 32. The controller 32 is connected to the pair of sensors 33, 34.

Next, a specific configuration example of the drive circuit of the AC motor 21 directly connected to the compressor 20 will be described with reference to FIG. The output of the AC generator 13 that generates electric power while generating the braking force is converted to DC by the inverter 38, and the output is supplied to the pair of DC electromagnetic contactors 39 and 40 via the chopper 25. ing.

The coils 41 and 42 of these contactors 39 and 40 are both connected to an outlet 27 that is connected to a commercial power source. When the commercial power source is turned on, these contactors 39 and 40 are connected. , 40 contacts can be switched to the terminals on the commercial power supply side. Moreover, the protection relay 43 is connected between the outlet 27 and the coil 41. The coil 44 of the relay 43 is connected to the auxiliary contact 45 of the DC electromagnetic contactor 39.

Output sides of the pair of DC electromagnetic contactors 39, 40 are connected to a DC / DC converter 31, and a temperature controller 47 and an evaporator heater controller 48 are connected to the DC / DC converter 31. .. The temperature controller 47 is connected to the system controller 32. On the other hand, an evaporator 49 is connected to the evaporator controller 48.

An inverter 29 is connected to the output terminal side of the DC electromagnetic contactor 40, and the AC motor 21 is driven by the AC output obtained by the inverter 29. A freezing ON / OFF switch 52 is connected to the inverter 29 via a relay 30.

Next, the battery 15 constituting the DC power source on the vehicle side is connected to the inverter 38 via the battery relay 53. The battery 15 is connected to a DC / DC converter 54 that steps down a DC voltage, and the output of this converter 54 is supplied to a vehicle load via a battery relay 55.

In the above-mentioned configuration, the DC power source on the vehicle side is supplied to the step-up chopper 25 of the drive circuit of the motor 21 through the terminal of 108 V, and the chopper 25 boosts the voltage to 300 V. Then, the boosted DC power is supplied to the inverter 29 through the DC electromagnetic contactor 39, converted into AC by the inverter 29, and drives the AC motor 21.

Since the AC motor 21 is linked to the compressor 20, the compressor 20 compresses the refrigerant and circulates the refrigerant between the condenser 19 and the evaporator 22 to provide the vehicle. The heat is taken from the freezer and released into the atmosphere by the condenser 19.

A part of the output side of the DC electromagnetic contactor 39 is stepped down to 27 V by the DC / DC converter 31, and the low-voltage DC power supply of 27 V is passed through the auxiliary contact 45 of the DC electromagnetic contactor 39 to the protection relay 43. It is supplied to the coil 44. The protective relay 43 is normally closed so that it is turned off only when the coil 44 is excited.

When the vehicle-side direct-current power is supplied, the coil 44 is excited and the protective relay 43 is turned off. Therefore, it is possible to cut off the commercial power from the outside supplied through the outlet 27. become. That is, in the state where the coil 44 of the protection relay 43 is excited, even if the consensus 27 is connected to the commercial power source side and the commercial power source is accidentally turned on to this circuit, the coils 41, 42 of the DC electromagnetic contactors 39, 40 are Maintains the demagnetized state as it is and maintains the state in which it is in contact with the vehicle-side contact. Therefore, the pair of contactors 39, 40 is prevented from being switched to the commercial power source side.

Next, when the AC motor 21 of the compressor 20 is driven by the commercial power source supplied through the outlet 27, this commercial power source is rectified by the rectifier 28 and the commercial power source side of the DC electromagnetic contactor 39 is connected. It is supplied to the inverter 29 through the terminal. Then, it is converted into alternating current again by the inverter 29 and drives the motor 21.

Moreover, at this time, the coils 41 and 42 are both excited by the AC power supply, and in particular, the auxiliary contact 45 is opened by the excitation of the coil 41. Therefore, even if the on-vehicle DC power is applied in such a state, the DC power is cut off by the auxiliary contact 45 of the DC electromagnetic contactor 39, and the coil 44 of the protection relay 43 is not excited. That is, the protection relay 43 is maintained in the closed state, and is maintained in the drive state by the commercial power source. Therefore, even if the DC power supply is turned on while operating on the commercial power supply side, the drive circuit will not be switched to the DC drive state.

[0024]

[Effect of the device]

 As described above, according to the present invention, the relay is connected to the drive circuit of the refrigeration cycle, and the circuit is disconnected when one of the on-vehicle direct current power source and the external commercial power source is driven and the other is turned on. It is designed to prevent the relay from changing. Therefore, even if one of the on-vehicle DC power supply and the external commercial power supply is being driven and the other is turned on, the driving state of the circuit does not change.

[Brief description of drawings]

FIG. 1 is a plan view of a main part of a truck including a vehicle refrigeration system according to an embodiment of the present invention.

FIG. 2 is a block diagram of a control circuit of this refrigeration system.

FIG. 3 is a circuit diagram of a drive circuit of a compressor drive motor.

[Explanation of symbols]

 10 Frame 11 Cab 12 Engine 13 Alternator 14 Resistor 15 Battery 16 Condensing Unit 19 Capacitor 20 Compressor 21 AC Motor 22 Evaporator 25 Boost Chopper 26 Main / Sub Switching Device 27 Outlet 28 Rectifier 29 Inverter 30 Relay 31 DC / DC Converter 32 System Controller 33 Control Panel 34, 35 Sensor 38 Inverter 39, 40 DC Electromagnetic Contactor 41, 42 Coil 43 Protection Relay 44 Coil 45 Auxiliary Contact 47 Temperature Controller 48 Eva Heater Controller 49 Eva Heater 52 Freezing ON / OFF Switch 53 Battery Relay 54 DC / DC converter 55 Battery relay

Front Page Continuation (72) Creator Tetsuo Koike 3-1-1 Hinodai, Hino-shi, Tokyo Within Hino Motor Co., Ltd. (72) Seiichi Yamaguchi 3-1-1 Hinodai, Hino-shi, Tokyo Hino Motor Co., Ltd. In the company

Claims (1)

[Scope of utility model registration request] 1. A vehicle refrigeration system in which a refrigeration cycle mounted on a vehicle is selectively driven by an on-vehicle DC power source and an external commercial power source, wherein a relay is connected to a drive circuit of the refrigeration cycle. A vehicle characterized in that the relay prevents the circuit from being switched when one of the on-vehicle DC power supply and the external commercial power supply is driven while the other is turned on. Refrigeration equipment.