JPS6231649B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a circuit configuration for preventing over-discharge of a battery, which is a DC power source, in a sub-engine refrigerator suitable for use in a refrigerator vehicle. A sub-engine refrigerator for a refrigerating vehicle having a DC circuit is equipped with a battery and a battery charging generator as a power source for the DC circuit. This generator has two types of power generation: one is a main generator that generates electricity when the compressor rotates and covers heavy loads such as the cooling motor, and the other is an auxiliary generator that generates electricity as the sub engine rotates in addition to the main generator. In some cases, they have a machine.

In the case of the former, where only the main generator is used, when the sub-engine is running and the temperature inside the freezer satisfies the set value, no power is generated while only the sub-engine is rotating, so electricity is consumed by the fuel pump, etc. As a result, the battery becomes discharged. If the difference between the outside air temperature and the inside temperature is small, the rotation time of the compressor, that is, the charging time, becomes short, and the time that only the sub-engine is rotating, that is, the discharging time becomes long, and the battery eventually becomes over-discharged. In the case where both the main generator and the auxiliary generator are used, both generators are operated in parallel while the compressor is being driven by the sub-engine. However, the generator stops generating electricity when the voltage exceeds a set voltage using a built-in or externally connected voltage regulator, and starts generating electricity again when the voltage drops.
This set voltage usually has a tolerance of about ±1V due to manufacturing reasons, and when operating in parallel, the one with the higher set voltage will generate electricity. Normally, the auxiliary generator is designed for low output, but if its set voltage is higher than the main generator side due to tolerance variations, the auxiliary generator will always be used at maximum output.
This will significantly shorten the life of the auxiliary generator.

In view of the above points, the present invention provides continuity between the auxiliary generator and the battery circuit in connection with the stoppage of the compressor, so that when only the sub-engine is rotating, the auxiliary generator generates electricity to charge the battery and compress the compressor. It is an object of the present invention to provide a sub-engine-driven refrigerator that can easily prevent battery over-discharge without reducing the life of the generator by charging the main generator when the machine is rotating.

The present invention will be described below with reference to embodiments shown in the drawings. 1 and 2 schematically show a refrigerating machine for a refrigerated vehicle. 1 is a compressor, 2 is an electromagnetic clutch attached to the compressor 1, and 3 is a compressor connected to the compressor via the electromagnetic clutch 2. This is a sub-engine that drives the refrigerated vehicle, and is provided independently from the refrigerated vehicle's driving engine (not shown). Reference numeral 4 indicates an auxiliary generator that is built in or separately placed in the sub-engine 3 and is driven by the sub-engine 3. Reference numeral 5 indicates an auxiliary electric motor, which is operated by being supplied with power from an external AC power source when the vehicle is stopped at night. 6 is a main generator, which is connected to the auxiliary charging motor 5 via a pulley and a belt. Further, the auxiliary electric motor 5 and the compressor 1 are also connected via a pulley and a belt.

A condenser 7 condenses the high-temperature, high-pressure gas refrigerant discharged from the compressor 1, and its cooling fan 8 is directly connected to the shaft of the electric motor 5. 9 is a receiver for storing liquid refrigerant; 10 is an expansion valve that adiabatically expands the liquid refrigerant to form a low-temperature, low-pressure mist; 11 is an evaporator that cools the inside of the freezer; 12 is a fan for circulating air inside the refrigerator; This is the drive motor.

A condensing unit 14 includes the devices 1 to 9 above, and is installed under the floor of the freezer 15 of the refrigerating vehicle as shown in FIG. A cooling unit 16 includes the devices 10 to 13 above, and is mounted on the ceiling inside the freezer 15, as shown in FIG. 17 is the driver's cab of the refrigerated truck.

FIG. 3 shows an electric control circuit according to the present invention, in which 18 is an engine system circuit including the auxiliary generator 4, 19 is a main control system circuit, and 20 is a refrigeration system circuit including the main generator 6. 21 is an on-vehicle power battery, 22 is an operation switch, 23a and 23b are changeover switches for switching the drive source between the sub-engine 3 and the auxiliary electric motor 5, 24 is a starting switch for the sub-engine 3, and 25 is a thermostat for adjusting the temperature inside the refrigerator. ,2
6 is a normally closed oil pressure switch that opens when the oil pressure of the sub-engine 3 rises above a predetermined value, and 27 is a high pressure switch for the refrigeration cycle, which closes when the high pressure rises abnormally. 28, 29, 30, 31, 3
2 and 33 are relay coils, each with 28 contacts.
a, 29a, 30a, 31a, and 33a. However, the contacts of the Leecoy 32 are for controlling the auxiliary motor 5 and are installed in an AC circuit (not shown). 34 is a controller that receives signals from switches 24 to 27 to turn on and off electricity to the relay coils 28 to 31; 35 is a starter for starting the sub-engine 3; 36 is a fuel pump; 37 is a sub-engine 3;
A throttle solenoid that switches the rotation between high and low speeds; high speed when energized and slow speed when de-energized. 38 is a voltage regulator for the auxiliary generator 4, and 39 is a voltage regulator for the main generator 6. The motor 13 of the cooling unit 16 is connected in series to the relay contact 33a. In this embodiment, the auxiliary generator 4 is a self-excited type, and the main generator 6 is a separately excited type. 4
0 and 41 are the power supply terminals of the controller 34, and 42
is the operation indicator lamp.

To explain the operation in the above configuration, the compressor 1
When the engine is driven by the sub-engine 3, the changeover switches 23a and 23b are operated to the positions shown in the figure. When the operation switch 22 is closed, power supply voltage is applied to the power supply terminal 40 of the controller 34 through the switch 23a, the relay coil 29 is energized, its contact 29a is closed, and the fuel pump 36 starts operating. Preparations for starting the sub-engine 3 are completed. Next, when the starting switch 24 is closed, the relay coil 28 is energized, its contact 28a is closed, the starter 35 is activated, and the sub-engine 3 is started. After the start is completed, when the start switch 24 is returned to the open position, the relay coil 28 is de-energized, the contact 28a is opened, and the starter 35 is stopped. When the start switch 24 returns to the open position, the timer circuit of the controller 34 energizes the relay coil 30 after a certain period of time, for example, one minute, and its contact 30a switches to the opposite side as shown in the figure, and the throttle solenoid 37 is energized. As a result, the sub-engine 3 rotates at high speed. Further, when some time elapses, for example, 5 seconds after the coil 30 is energized, the relay coil 31 is energized, its contact 31a is closed, the electromagnetic clutch 2 is energized, and the sub-engine 3 is energized.
The power is transmitted to the compressor 1, and the compressor 1 starts rotating. Simultaneously with this compressor 1, power is transmitted to the auxiliary motor 5 and the main generator 6, and the fan 8 rotates through the motor 5, and the main generator 6
rotates. At the same time, relay coil 3
3 is energized and its contact 33a is closed, the motor 13 of the cooling unit 16 rotates, and the refrigeration cycle shown in FIG. 1 is operated. At this time,
The main generator 6 is excited via the voltage regulator 39 and generates electricity. The power generation output passes through line 6a and battery 2
1 and supplies power to other devices.
Further, at this time, the auxiliary generator 4 is driven and rotated by the sub-engine 3, so it is generating electricity, but since the contact 30a is switched to the opposite side as shown in the figure, it is always in a no-load state. Therefore, no load is placed on the auxiliary generator 4.

On the other hand, as cooling progresses and the temperature inside the freezer 15 drops to the set value, the thermostat 25 is closed, the relay coils 30 and 31 are de-energized, the contact 31a is opened, and the electromagnetic clutch 2 is de-energized. Compressor 1 stops. At this time, the relay coil 33 is also de-energized, and the motor 13 of the cooling unit 16 is stopped. Furthermore, when the electromagnetic clutch 2 is de-energized and disconnected, the main generator 6 stops rotating and excitation and does not generate electricity, eliminating wasteful power consumption. On the other hand, since the contact 30a returns to the state shown in the figure, the throttle solenoid 37 is de-energized, the sub-engine 3 rotates at a low speed, and the output of the auxiliary generator 4 is transmitted via the voltage regulator 38 to the contacts 30a, 29a. Through Batsuteri 21
and supplies power to other devices.

When the temperature inside the freezer rises due to the stoppage of the compressor 1 and the thermostat 25 is opened again, the relay coils 30 and 31 are energized and a cooling operation is started. As described above, the two generators 4 and 6 are used without generating load power at the same time, and the voltage regulators 38 and 3 of each
Regardless of whether the setting value 9 is high or low, the battery 21 can be charged without reducing its life and will not be over-discharged. Further, when driving by the auxiliary electric motor 5 when the vehicle is stopped at night, etc., the changeover switches 23a and 23b are operated to the opposite side as shown in the figure. Then, when the operation switch 22 is closed, the switch 2
3a, a power supply voltage is applied to the power supply terminal 40, the relay coil 31 is energized and the contact 31a is closed, the relay coil 32 is energized through the switch 23b, the auxiliary motor control circuit (not shown) is activated, and the motor is activated. 5 rotates to drive the compressor 1, main generator 6, and fan 8. As in the case of cooling by the sub-engine 3, the main generator 6 charges the battery 21. When the temperature inside the freezer drops to the set value, the thermostat 25 closes, the relay coil 31 becomes de-energized, and the contact 3
1a is opened, the compressor 1, electric motor 5, main generator 6, and fan 8 stop, and the main generator 6 stops generating electricity, but the power consumption at this time is about the indicator lamp 42, and the battery 21 will not over-discharge.

It should be noted that although the above-described embodiments show preferred embodiments of the present invention, the present invention is not limited thereto and can be modified in various ways.
The auxiliary generator 4 may be self-excited or separately excited. Further, for switching between the throttle solenoid 37 and the auxiliary generator 4, instead of providing one set of make-break contacts 30a as in the previous embodiment, a make contact and a break contact may be separated. Further, separate relays may be provided independently for controlling the throttle solenoid 37 and for switching the circuit of the auxiliary generator 4. Further, the electromagnetic clutch 2 can be replaced with a centrifugal clutch, and either clutch can be used to replace the compressor 1 with the sub-engine 3.
It may be installed on the

Furthermore, in the above-mentioned embodiment, the case where the compressor 1 is driven by both the sub-engine 3 and the electric motor 5 has been explained, but the present invention can also be applied to a case where the electric motor 5 is abolished and the compressor 1 is driven only by the sub-engine 3. is equally applicable.

As described above, the present invention is equipped with an auxiliary generator that rotates as the sub-engine rotates, and a main generator that rotates as the compressor rotates, and when only the sub-engine rotates, the auxiliary generator charges the battery. However, since the battery is charged by the main generator when the compressor is rotating, it has the excellent effect of preventing battery over-discharge without reducing the life of the generator.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic diagram of a refrigerator, FIG. 2 is a schematic diagram of a vehicle showing how the refrigerator car is mounted, and FIG. 3 is an electric circuit diagram. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Electromagnetic clutch forming clutch means, 3... Sub engine, 4... Auxiliary generator, 5... Auxiliary motor, 6... Main generator, 21...
...Battery, 34...Controller, 28-33
...Relay coil, 28a to 30a...Contact.

Claims (1)

[Claims] 1. A sub-engine that drives the compressor via a clutch means, an auxiliary generator that rotates as the sub-engine rotates, a main generator that rotates as the compressor rotates, and a compressor that drives the compressor by the sub-engine. a controller that controls the temperature inside the refrigerator by intermittent driving of the machine; and a controller that connects the auxiliary generator to a battery circuit to charge the battery when the compressor is stopped and only the sub-engine is rotating;
and a relay means for disconnecting the auxiliary generator from the battery circuit and charging the battery with the main generator when the compressor is being driven by the sub-engine. Machine.