JPH0420770A - Land transportation refrigerator - Google Patents

Abstract

PURPOSE:To prevent overdischarging state of a battery by starting an engine when engine stopping time detected by detecting means becomes a set time or longer, and then stopping the engine when completion of charging of the battery is sensed by sensing means. CONSTITUTION:A start timer TA counts up when counting is started by the stop of an engine 1 and a set time gamma1 is elapsed, and the start of the engine 1 is instructed from a controller 14 by the countup signal. A charge timer TB starts to count simultaneously upon the countup of the timer TA, i.e., the start of the engine 1, and is counted up when a set time gamma2 is elapsed. The stop of the engine 1 is instructed from the controller 14 by the countup signal. The times gamma1, gamma2 are determined, for example, in such a manner that the time gamma1 is decided as a time up to a minimum necessary charge storage amount of a battery 16 due to its discharge and the time gamma2 is decided as a time required to sufficiently charge the battery 16.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is used in a refrigeration unit mounted on a refrigerated transport vehicle, etc., and is driven by a refrigeration system engine separate from the vehicle drive engine. Related to Refrigeration Equipment for Land Transportation [Prior Art] Fig. 4 is a system diagram of a conventional refrigeration equipment. In the figure,
1 is an engine, 2 is a compressor driven by the engine, 3Fi is a three-way valve connected to the same compressor, 4 is a solenoid that drives the three-way valve and switches between cooling operation and heating operation, and 5 is connected to the three-way valve. A condenser, 6 is a fan that sends outside air to the condenser, 7Vi is a motor that drives the fan, 8 is an expansion valve connected to the condenser, 9 is an evaporator installed in the freezer/refrigerator, and 10Fi is a fan that supplies air inside the refrigerator to the evaporator. A sending fan, 11 a motor for driving the fan, 12 a check valve connected to the evaporator, 13
is a thermometer that detects the temperature inside frozen/refrigerated books, 14
15 is a control device; 15 is a generator driven by the engine; 16 is a battery that is charged by the generator and serves as a power source for starting the engine and operating the control device;
Reference numeral 17 indicates a means for detecting the amount of charge of the battery.

In the refrigeration system having the above configuration, during cooling operation, the refrigerant passes through the compressor 2, the three-way valve 3, the condenser 5, the expansion valve 8, the evaporator 9, and the check valve 12 in this order, as shown by the solid arrow. Return to On the other hand, during heating operation, the refrigerant returns to the compressor 2 through the compressor 2, the three-way valve 3, the evaporator 9, and the check valve 12 in this order, as shown by the broken line arrow. The outputs of the thermosensor 13 and the means 17 are input to the control device 14, and the engine 1, solenoid 4,
Motor 7 and motor 11 are controlled.

The control device 14 has a built-in thermostat TH1, a thermostat TH1, and a thermostat TH2, as shown in FIG. 5(b).
It turns OFF when it reaches the upper limit temperature Tl, and turns ON when it reaches the upper limit temperature Tl. In addition, when the TH2Fi internal temperature T reaches the set temperature Ts, it turns OFF.
When the lower limit temperature T2 is reached, it becomes @ON. In such a device, when the load is a cooling load, the
), heat absorption operation is performed as shown by the solid line, and when the load is a heating load, heat radiation operation is performed as shown by the broken line in FIG. 5(2).

During endothermic operation, when the internal temperature T reaches the upper limit temperature T of the thermostat THI, the engine 1 is started according to a command from the control device 14, and the generator 15 starts charging the battery 16, and at the same time the refrigeration system starts. starts cooling operation. And while engine 1 is running, generator 15Fi
Continuing to charge the battery 16, e.g.
When a signal indicating the completion of charging is output, the engine 1 is stopped when the internal temperature T reaches the set temperature Ts, that is, at point C. If there is no signal indicating that the battery 16 is sufficiently charged even when the internal temperature T reaches the set temperature Ts, a command to switch from cooling operation to heating operation is output, and a charging completion signal for the battery 16 is output. The engine 1 is stopped at the time when the sensor 17 outputs the signal, that is, at two points. In this way, the engine 1 is stopped after the battery 16 is sufficiently charged.

Also, when the load is a heating load, heat dissipation operation is performed, and when the internal temperature (T is thermostough) reaches the lower limit temperature T of TH2, heating operation is commanded, and when the set temperature Ts is reached, heating operation is stopped. Switched to cooling operation. Thereafter, the engine 1 is stopped after charging of the battery 16 is completed, as in the endothermic operation.

[Problem to be solved by the invention]

In a conventional refrigeration system, for example, during endothermic operation, when the battery 16 is sufficiently charged and the engine 1 is in a stopped state, the temperature difference between the outside air and the inside of the refrigerator is small, and there is almost no heat intrusion from the outside into the inside of the refrigerator. If the refrigeration load is extremely small, such as when something goes wrong or the heat generation of the frozen object is small, it will take a long time for the internal temperature T to reach the upper limit temperature Tl of THI (thermostough). The engine 1 will be stopped for a long time. In such a case, the battery 16 is not charged, and the battery 16 is only discharged by energizing the control device 14, resulting in an overdischarge.

-! In addition, conventionally, in order to compensate for insufficient charging, charging was performed by repeating heat absorption operation without starting or stopping the engine, but this method: #! However, it had the disadvantage of wasting money unnecessarily.

The present invention solves the above-mentioned drawbacks of the prior art, avoids stopping the engine for a long time, maintains a sufficient amount of battery charge, and
It is an object of the present invention to provide a means for preventing an over-discharge state of a battery from occurring, thereby reducing the need to carry out endothermic operation, heat dissipation operation, and oxidative charging that waste a lot of fuel.

[Failure to solve the problem]

The present invention has solved the above problem, and is equipped with an engine for a refrigeration system, and the engine drives a compressor, and also drives a generator to charge a battery, and uses the battery as a power source to power the engine. A refrigeration system for land transport that adjusts the temperature inside a freezer/refrigerator by starting and stopping the refrigeration system, comprising: a detection means for detecting the stop time of the top and bottom; and a detection means for detecting the completion of charging of the battery; A control device is provided that starts the engine when the engine stop time detected by the detection means exceeds a set time, and then stops the engine when the detection means detects that the battery is fully charged. The present invention relates to a refrigeration system for land transportation characterized by the following.

[Effect]

In the present invention, by having the above-mentioned configuration, when the engine stop time has elapsed beyond the set time, the engine is started and the generator starts charging the battery.Next, after the battery is sufficiently charged, the engine is started and the generator starts charging the battery. As a result, the engine will not remain stopped for a long time even when the refrigeration load or heating load on the refrigeration system is extremely small, and the battery will always maintain a sufficient charge level. I can do it.

〔Example〕

FIG. 1 is a system diagram of an embodiment of the present invention. In the figure, TA is a start timer provided in the control device 14, and acts as a means for detecting the engine stop time. T.B.
is a charging timer also provided in the control f=t14, and serves as a means for detecting the completion of battery charging.
The configuration other than the above is the same as that of the prior art, so a description thereof will be omitted.

The start timer TA starts counting when the engine 1 is stopped, and counts up when the set time τ1 has elapsed.This count-up signal causes the control device 14 to command the engine 1 to start, and the charging timer TB starts counting up when the set time τ1 has elapsed. That is, the count-up starts at the same time as the engine 1 is started, and the count-up starts when the set time τ2 has elapsed, and the control device 14 issues a command to stop the engine 1 based on this count-up signal. For each set time τ and 2τ2, for example, the set time τlii is defined as the time required for the battery 16 to reach the minimum required amount of electricity by discharging it, and the set time τ2 is defined as the time required to sufficiently charge the battery 16. FIG. 2 is an explanatory diagram showing the start/stop state of the engine during endothermic operation of the above embodiment. In FIG. 2, during the endothermic operation, the control device 14 commands the cooling operation at point A, that is, the upper limit temperature T, 'tc of the thermostat TH1. Then, the engine 1 starts, the refrigeration system starts cooling operation, and at the same time, the generator 15 starts charging the battery 16. The internal temperature T of the refrigerator gradually decreases due to the cooling operation of the refrigeration system, and if, for example, the battery 16 completes photoelectric discharge at four points during this period, it is determined that the internal temperature of the refrigerator has reached the set temperature Ts.
At point C, the engine 1 is stopped. Then, at the same time as the engine 1 is stopped, the start timer TA starts counting. When the stop time of the engine 1 reaches the set time 71 or more, that is, when the start timer TA counts up at two points, the engine 1 is started and the generator 15 is activated by the batch '7'.
At the same time as charging starts, the charging timer TB starts counting. Note that when the engine 1 is started, the count of the start timer TA is reset and held at zero. Subsequently, the charging timer TB counts up when the set time τ2 has elapsed, and when the engine 1 is stopped, the starting timer TA starts counting again.

Note that when the engine 1 is stopped, the count of the charging timer TB is reset and held at zero. As described above, the generator 15F'i is driven open for the set time τ2, and thereby the patch 1J16F'i is sufficiently charged.

In the above, if the start timer TA starts counting when the engine stops and the internal temperature T reaches the upper limit temperature Tl before the set time τl elapses, the thermostat T The engine 1 is started and a cooling operation is performed, and the generator 15 is driven to charge the battery 16.

When the engine 1 is started, the start timer TAo count is reset and held at zero.

In this way, the refrigeration load is extremely small, making thermo-tough)
When the engine 1 start command based on I (also i! TH2) is not issued for a long time and the engine 1 has stopped for a set time τl, the engine 1 is started and the generator 15 starts the battery 16. Since the battery 16 is sufficiently charged, over-discharge of the battery 16 is prevented. Therefore, the engine 1 is stopped after the battery 16 is sufficiently charged, and since the engine 1 is not stopped for a long time, the battery 1
6 can maintain a sufficient amount of charge at all times.

In this example, a case has been described in which the refrigeration system is under heat absorption operation, but similarly during heat release operation, when the engine stop time exceeds the set time τ, the engine is started for the set time τ2, The battery is sufficiently charged.

In addition, in this example, the charging timer TB is shown as the charging detection means, but a charging sensor that issues a charging completion signal when the charging current becomes less than a predetermined value may also be used. It is a control flowchart which shows the order.

As detailed above, in this embodiment, when the engine stop time exceeds a predetermined time, the engine is started and the battery is sufficiently charged, so that the refrigeration load or heating load on the refrigeration system is extremely low. Even if it is small, the engine will not be stopped for a long time, and over-discharge of the battery will be prevented. In addition, since a sufficient amount of charge is always maintained, there is no need to repeatedly perform charging through heat absorption and heat release operations, and fuel can be saved.

[Effects of the Invention] The land transport refrigeration system of the present invention includes a detection means for detecting engine stop time and a detection means for detecting completion of battery charging, and the engine stop time detected by the detection means is The control device starts the engine when the time exceeds a set time, and then stops the engine when the detection means detects that the battery is fully charged. Even if the amount of charge is extremely small, the engine will not remain stopped for a long time, and the battery can always maintain a sufficient amount of charge.

Thereby, it is possible to avoid an over-discharge state of the battery, and it is also possible to eliminate waste of fuel due to repetition of heat absorption operation and heat radiation operation for charging.

[Brief explanation of the drawing]

Figure 1 is a system diagram of one embodiment of the present invention, 'Ig2 diagram is P]
An explanatory diagram showing the start/stop state of the engine during endothermic operation of the embodiment, FIG. 3 is a control flowchart of the embodiment, and FIG.
The figure is a system diagram of a conventional refrigeration system, FIG. 5(a) is an explanatory diagram of operation switching of the conventional refrigeration system, and FIG. 5(b) is an explanatory diagram of switching of the thermostat of the same equipment. , 2... Compressor, 3...
・Three-way valve, 4... Lenoid, 5°... Capacitor, 6... Fan, 7... Motor, 8...
...Bulge? i sho, 9...evaporator, 1o...
Fan, 11...Motor, 12...Check valve,
13... Thermosensor, 14... Control device, 15
-... Generator, 16... Battery, 17... Battery charge detection means, TA... Starting timer, TB... Charging timer. Agent Patent Attorney Akatsuki Sakama 2 Meigetsu 1 Flash 9 Shimane 4 Figures! 55 flash sacrifice

Claims (1)

[Claims] Equipped with an engine for the refrigeration system, the engine drives the compressor, drives a generator to charge the battery, and uses the battery as a power source to start and stop the engine to adjust the temperature inside the freezer/refrigerator. A refrigeration system for land transportation, comprising a detection means for detecting the stop time of the engine and a detection means for detecting completion of charging of the battery, wherein the stop time of the engine detected by the detection means is longer than a set time. When the above engine is started,
A refrigeration system for land transportation, further comprising a control device that stops the engine when the detection means detects that charging of the battery is completed.