JP4947292B2 - Fuel temperature control device - Google Patents

Description

  The present invention relates to a fuel temperature adjusting device capable of supplying fuel adjusted to various temperatures to the engine in order to test a gasoline engine or a diesel engine provided in an engine test chamber.

Conventionally, in order to confirm the performance of a newly developed engine, performance evaluation tests assuming various environments have been performed. In such a performance evaluation test, engine performance may be evaluated while supplying fuel at a constant temperature. For example, assuming a cold region, a technique is considered in which a predetermined cooling means is installed, the fuel is cooled by the cooling function of the cooling means, and the cooled fuel is supplied to the engine (for example, Patent Document 1). reference). However, for example, in a diesel engine test, when it is necessary to heat light oil as a fuel, the fuel can be heated based on the heat generated by the engine, but when the engine load is small, that is, the amount of heat generated by the engine If the amount is small, the fuel may not be heated sufficiently. Therefore, it is very difficult to control the temperature of the fuel at room temperature or higher in the technology having only such a cooling function. On the other hand, there is a technique of providing a heating means such as an electric heater that directly heats the fuel in addition to the cooling means (see, for example, Patent Document 2).
Japanese Patent Publication No. 5-54903 Japanese Utility Model Publication No. 57-156069

  However, the provision of a heating means that directly heats the fuel with an electric heater, regardless of whether light oil is used as the fuel, causes ignition due to overheating of the heating means when gasoline with a low flash point / ignition point is used. There is a risk of exceeding the point, and in fact, the electric heater is locally extremely hot, which is extremely difficult in practice. That is, the above-described technique is practically available only when testing a diesel engine and cannot be used when testing a gasoline engine.

  The present invention has been made in view of the above-described problems, and its object is to determine whether the fuel is gasoline or light oil in a performance evaluation test of a gasoline engine or a diesel engine provided in an engine test chamber. Accordingly, it is an object of the present invention to provide a fuel temperature adjusting device capable of stably supplying a fuel having a desired temperature to an engine, and thereby dramatically improving test accuracy.

  Hereinafter, each means suitable for solving the above-described object will be described in terms of items. In addition, the effect specific to the means to respond | corresponds as needed is added.

Means 1. A fuel temperature adjusting device capable of supplying fuel adjusted to various temperatures to the engine for testing a gasoline engine or a diesel engine provided in an engine test chamber,
A first circulation device for circulatingly supplying fuel to the engine;
A second circulation device comprising pump means for circulating the heat exchange medium;
A heat exchanger for exchanging heat between the fuel circulating in the first circulation device and the heat exchange medium circulating in the second circulation device;
Heating means for heating the heat exchange medium of the second circulation device;
Cooling means for cooling the heat exchange medium of the second circulation device;
Temperature detecting means for detecting the temperature of the heat exchange medium immediately before flowing into the heat exchanger;
2. A fuel temperature adjusting apparatus comprising: a control unit that controls the heating unit and the cooling unit based on a temperature detected by the temperature detection unit and a preset target temperature of the fuel.

  According to the means 1, the fuel temperature adjusting device is provided with pump means, heating means, and cooling means. The pump means can circulate and supply the heat exchange medium to the heat exchanger. In the first circulation device, the fuel is sent to the engine side by some pressure feeding means. Before the test, the fuel pressure can be constantly applied to the fuel while keeping the fuel at a predetermined temperature. When a large amount of fuel is consumed during operation or the like, the structure may be such that almost no fuel flows into the return pipe of the first circulation device. Furthermore, the temperature of the heat exchange medium can be adjusted in a wide range from a low temperature to a high temperature by the heating means and the cooling means, and the temperature of the fuel can be adjusted in a wide range from the low temperature to the high temperature. This is a configuration that can be achieved even when fuel does not flow through the return pipe of the first circulation device. This is because the heat capacity of the fuel flow rate is small.

  Further, in the heat exchanger, heat exchange is performed between the fuel circulating in the first circulation device and the heat exchange medium circulating in the second circulation device, thereby heating or cooling the fuel. be able to. Further, the fuel can be indirectly heated by the heat exchanger via a heat exchange medium whose temperature is adjusted. In the case of the present application, instead of direct heating that takes a large temperature difference with a heat exchanger having a small heat transfer area, indirect heating via a heat exchange medium, and increasing the heat transfer area of the heat exchanger and its heat capacity, Instead, the temperature difference is reduced. Therefore, it is easy to ensure safety compared with the case where the first circulation device is provided with heating means and the fuel is directly heated. In particular, even when gasoline with high volatility and low flash point / ignition point is used as a fuel, it is not directly heated, so that a relatively safe test can be realized. As a result, regardless of whether the fuel is gasoline or light oil, fuel at a desired temperature can be stably supplied to the engine.

  In addition, a control unit is provided, and the control unit controls the heating unit and the cooling unit based on the temperature of the heat exchange medium immediately before being supplied to the heat exchanger and a preset target temperature of the fuel. The Normally, it is possible to control the heating means and the cooling means by using the temperature measurement value of the fuel having a small flow rate and further changing the heat capacity. In this case, the heating means and the cooling means are controlled. Due to the large capacity of the fuel, it is impossible to follow the fluctuation of the fuel flow rate, and overshoot of the fuel outlet temperature occurs and it is difficult to maintain the control accuracy. With the above configuration of the means 1, the heating means and the cooling means are controlled at the temperature immediately before the heat exchanger of the heat exchange medium circulating in the second circulation device, so that the heat capacity of the heat exchange medium with a constant flow rate is increased. That is, if the amount of liquid retained in the second circulation device and the heat exchanger is increased, the heat exchange medium temperature does not overshoot and becomes very stable. If the temperature of the heat exchange medium immediately before the heat exchanger is set close to the target temperature of the fuel, the fuel temperature will not rise above the heat medium temperature on the primary side, and the temperature of the fuel supplied to the engine Adjustments can be made very close to the desired target temperature. As a result, the test accuracy can be dramatically improved.

  Further, if the temperature detection means is provided immediately after the fuel flows out of the heat exchanger, it can be said that the heat capacity of the heat exchange medium circulating in the second circulation device is larger than that of the fuel. The heat exchange medium temperature at the outlet is the result of the heat exchange, and in an advantageous countercurrent heat exchanger, the upper limit temperature of the fuel temperature can be directly controlled, and the heat exchange medium immediately before being supplied to the heat exchanger can be controlled. Compared with control by temperature, the control accuracy is necessarily inferior. On the other hand, in the means 1, a temperature detecting means is provided at a portion immediately before the heat exchange medium flows into the heat exchanger. Further, the flow rate of the heat exchange medium circulating through the second circulation device is substantially constant, and the detected temperature fluctuation is relatively gradual. Therefore, the above problems can be eliminated, and an increase in the difference between the target fuel temperature and the temperature of the fuel supplied to the engine can be prevented.

Mean 2. In the fuel temperature adjusting device according to means 1,
The upper limit of the temperature difference between the temperature of the heat exchange medium immediately before flowing into the heat exchanger and the temperature of the heat exchange medium immediately after flowing out of the heat exchanger is actually the target temperature of the fuel and the engine. The heat exchanger is calculated from the maximum heat exchange heat amount of the fuel passing through the first circulation device so that the specific value is not more than half of the allowable temperature difference allowed as the temperature difference with the temperature of the fuel supplied to the fuel. A fuel temperature adjusting device characterized in that the pump means has a sufficient heat exchanging capacity to process the quantity of heat and the pump means has a sufficient pumping capacity.

  According to the means 2, the temperature of the heat exchange medium immediately before flowing into the heat exchanger (referred to as “medium inflow temperature”) and the temperature of the heat exchange medium immediately after flowing out of the heat exchanger (“medium outflow temperature”). The heat exchanger and the pump means are used so that the upper limit of the difference (referred to as “temperature difference between the inlet and outlet”) becomes a value equal to or less than half of the allowable temperature difference, that is, a specific value. That is, as such a heat exchanger and pump means, for example, the maximum fluctuation value of the fuel temperature in the performance evaluation test [for example, the normal temperature (for example, 25 ° C.) to the upper limit temperature of the fuel target temperature (for example, 75 ° C.) Temperature difference (for example, 50 ° C.)], maximum flow rate per unit time of fuel, specific heat of fuel, etc. A heat exchanger having a sufficient capacity and heat transfer area and a pump means capable of pumping a sufficient amount of heat exchange medium are used so that the temperature difference between the two becomes a specific value. By providing such a heat exchanger and pump means, the temperature difference between the inlet and outlet can be kept within a relatively small range regardless of the flow rate and temperature of the fuel flowing into the heat exchanger. Thereby, it is possible to prevent variation in the temperature of the fuel flowing out from the heat exchanger, and to stabilize the fuel temperature. As a result, fuel having a substantially constant temperature can be supplied to the engine. When the flow rate of the fuel is relatively small or when the temperature difference between the target temperature of the fuel and the temperature of the fuel flowing into the heat exchanger is relatively small, the temperature difference between the inlet and outlet is further greater than the specific value. As a result, the fuel temperature can be further stabilized.

Means 3. In the fuel temperature adjusting device according to means 2,
The heat exchanger has a sufficient heat exchange capability so that the temperature of the fuel flowing out of the heat exchanger becomes substantially equal to the temperature of the heat exchange medium immediately before flowing into the heat exchanger,
The control means is a temperature obtained by adding the specific numerical value to the target temperature of the fuel, or a temperature obtained by subtracting the specific numerical value from the target temperature of the fuel, the temperature of the heat exchange medium immediately before flowing into the heat exchanger. The fuel temperature control apparatus controls the heating means and the cooling means.

  According to the means 3, the heat exchanger has sufficient heat exchange capability, and the temperature of the fuel discharged from the heat exchanger can be made substantially equal to the temperature of the heat exchange medium flowing through the heat exchanger. Further, by controlling the heating means and the cooling means by the control means, the temperature of the heat exchange medium flowing through the heat exchanger is between the target temperature of the fuel and the temperature obtained by adding the specific numerical value to the target temperature of the fuel. Alternatively, it is set between the target temperature of the fuel and the temperature obtained by subtracting the specific numerical value from the target temperature of the fuel. That is, the temperature difference of the specific numerical value to be added or subtracted becomes potential, and the temperature of the fuel flowing out from the heat exchanger can be brought close to the target temperature of the fuel. On the other hand, when the temperature of the heat exchange medium flowing into the heat exchanger is equal to the target temperature of the fuel, the target temperature is not reached because of the finite heat transfer area of the heat exchanger. Therefore, as a result of the means 3, the temperature of the fuel flowing out from the heat exchanger can be made very close to the target temperature.

Means 4. In the fuel temperature adjusting device according to any one of means 1 to 3,
The control means sets the set value of the temperature of the heat exchange medium immediately before flowing into the heat exchanger,
When the target temperature of the fuel is equal to or higher than a predetermined numerical value set in advance, a temperature obtained by adding the specific numerical value to the target temperature of the fuel,
When the target temperature of the fuel is less than the specified value, the heating unit and the cooling unit are controlled so as to be a temperature obtained by subtracting the specific value from the target temperature of the fuel to be a set value of each heat exchange medium temperature. A fuel temperature control device.

  Depending on the test conditions, the allowable temperature difference allowed for the target temperature of the fuel is allowed to be higher from the target temperature or lower than the target temperature, rather than being the same numerical value around the target temperature. Many are acceptable. If there is a meaning of high temperature test or low temperature test after the specified value of the test purpose, if the allowable value setting is high temperature test, the target temperature of the fuel is cleared and allowed to be higher, in the case of low temperature test, The target temperature of the fuel is cleared and allowed to be lowered. Therefore, adding or subtracting a specific value from the target temperature of the fuel in accordance with this allowable temperature setting is advantageous for making the temperature of the fuel flowing out of the heat exchanger very close to the target temperature. It goes without saying that there is.

  In this respect, according to the means 4, the heating means and the cooling means are controlled by the control means, and when the target temperature of the fuel is equal to or higher than the specified value, the temperature obtained by adding the specific value to the target temperature of the fuel flows into the medium. On the other hand, when the fuel target temperature is lower than the specified value, the medium inflow temperature is determined by subtracting the specific value from the fuel target temperature. As a result, when the target temperature of the fuel is higher than the specified value, the fuel flowing out of the heat exchanger is relatively higher than the target temperature of the fuel, and when the target temperature of the fuel is lower than the specified value. Is made relatively cooler than the target temperature of the fuel. As a result, it is possible to accurately control the fuel target temperature in accordance with the purpose of the test, including the allowable temperature difference.

Means 5. A fuel temperature adjusting device capable of supplying fuel adjusted to various temperatures to the engine for testing a gasoline engine or a diesel engine provided in an engine test chamber,
A first circulation device for circulatingly supplying fuel to the engine;
A second circulation device comprising pump means for circulating the heat exchange medium;
A heat exchanger for exchanging heat between the fuel circulating in the first circulation device and the heat exchange medium circulating in the second circulation device;
Heating means for heating the heat exchange medium of the second circulation device;
In addition to the heat exchange medium circulating in the second circulation device, a third circulation device in which a cooling heat exchange medium circulates;
Heat for cooling that performs heat exchange between the heat exchange medium that circulates in the second circulation device and the heat exchange medium that circulates in the third circulation device, and cools the heat exchange medium that circulates in the second circulation device An exchange,
A flow rate adjusting means for adjusting a flow rate of the cooling heat exchange medium supplied to the cooling heat exchanger;
Temperature detecting means for detecting the temperature of the heat exchange medium immediately before flowing into the heat exchanger;
2. A fuel temperature adjusting apparatus comprising: a control means for controlling the heating means and the flow rate adjusting means based on a temperature detected by the temperature detecting means and a preset target temperature of the fuel.

  According to the means 5, the heat exchange medium can be circulated and supplied to the heat exchanger by the pump means, and the temperature of the heat exchange medium circulating in the second circulation device is lowered from the low temperature by the heating means and the cooling heat exchanger. A wide range up to a high temperature can be adjusted quickly. As a result, the temperature of the fuel can be adjusted in a wide range and quickly. The flow rate adjusting means adjusts the flow rate of the cooling heat exchange medium flowing into the cooling heat exchanger. As a result, the degree of cooling of the heat exchange medium by the cooling heat exchanger is adjusted.

  In the heat exchanger, heat is exchanged between the fuel circulating in the first circulation device and the heat exchange medium circulating in the second circulation device, whereby the fuel can be heated or cooled. it can. Further, the fuel can be indirectly heated by the heat exchanger via a heat exchange medium whose temperature is adjusted. Therefore, the first circulation device is provided with heating means for directly heating the fuel with an electric heater, and it is easy to ensure safety as compared with the case of directly heating the fuel. Especially when light oil is used as fuel, even when gasoline with low flash point / ignition point is used, overheating of the heating means does not occur, and there is no risk that the ignition point of the fuel will be exceeded by heating. A relatively safe test can be performed. As a result, regardless of whether the fuel is gasoline or light oil, fuel at a desired temperature can be stably supplied to the engine.

  In addition, a control unit is provided, and the heating unit and the flow rate adjusting unit are controlled by the control unit based on the temperature of the heat exchange medium immediately before flowing into the heat exchanger and a preset target temperature of the fuel. The As a result, the temperature of the heat exchange medium supplied to the heat exchanger can be made substantially equal to the target temperature of the fuel, and consequently the temperature of the fuel supplied to the engine is adjusted to a temperature substantially equal to the desired target temperature. be able to. As a result, the test accuracy can be dramatically improved.

  Further, in the cooling heat exchanger, heat is exchanged between the heat exchange medium circulating in the second circulation device and the cooling heat exchange medium circulating in the third circulation device, whereby the second circulation is performed. The heat exchange medium circulating in the device can be cooled. As described above, since the heat exchange medium can be indirectly cooled by the heat exchanger, the cooling device is provided with a cooling means in the second circulation device, and compared with the case where the refrigeration output of the cooling means is variably controlled. The degree of freedom is greatly increased. Specifically, the cooling means is provided in the second circulation device to variably control the refrigeration output of the cooling means because the cooling means is a refrigerator and controls the output of the compressor and the like, and the heat flowing through the cooling means Since control is performed to change the flow rate and temperature difference of the exchange medium, the temperature of the heat exchange medium tends to become unstable. In the case of means 5, it is possible to form a control system in which a predetermined amount of heat medium and flow rate are passed through the cooling means and a bypass is formed by piping. Furthermore, if such a control system is assembled, it is possible to share the cooling means, which is one refrigerator, with a large number of fuel temperature adjusting devices. In addition, different heat exchange media can be circulated between the second circulation device and the third circulation device. Thus, for example, the second circulation device circulates a heat exchange medium that can be used in a wide temperature range from a relatively high temperature to a relatively low temperature, while the third circulation device has a relatively low freezing temperature, A heat exchange medium suitable for cooling can be circulated.

  Also, if the temperature detection means is provided immediately after the fuel flows out of the heat exchanger, if the fuel flow rate fluctuates abruptly (for example, the engine speed is increased or decreased abruptly). In such a case, the control cannot follow the temperature fluctuation of the fuel, and as a result, the difference between the temperature of the fuel supplied to the engine and the target temperature of the fuel may increase. On the other hand, in the means 5, a temperature detection means is provided at a site immediately before the heat exchange medium flows into the heat exchanger. Further, the flow rate of the heat exchange medium circulating through the second circulation device is substantially constant, and the detected temperature fluctuation is relatively gradual. Therefore, the above problems can be eliminated, and an increase in the difference between the target temperature and the temperature of the fuel supplied to the engine can be prevented.

Means 6. In the fuel temperature adjusting device according to means 5,
The fuel temperature adjusting device, wherein the amount of exchange heat in the heat exchanger for cooling and the amount of exchange heat of the heating means are substantially equal.

  According to the means 6, the exchange heat amount of the cooling heat exchanger and the exchange heat amount of the heating means are substantially equal. That is, the ability to cool and heat the heat exchange medium circulating in the second circulation device is substantially equal. Therefore, even when the heat exchange medium is overheated or supercooled, the heat exchange medium can be quickly returned to the original temperature by the heating means or the cooling heat exchanger. As a result, the temperature of the heat exchange medium can be instantaneously controlled, and consequently the temperature of the fuel can be instantaneously controlled.

Mean 7 A fuel temperature adjusting device capable of supplying fuel adjusted to various temperatures to the engine for testing a gasoline engine or a diesel engine provided in an engine test chamber,
A first circulation device for circulatingly supplying fuel to the engine;
A second circulation device comprising pump means for circulating the heat exchange medium;
A heat exchanger for exchanging heat between the fuel circulating in the first circulation device and the heat exchange medium circulating in the second circulation device;
Heating means for heating the heat exchange medium of the second circulation device;
A third circulation device connected to the second circulation device and capable of supplying a cooling heat exchange medium for cooling the heat exchange medium by being mixed with a heat exchange medium circulating in the second circulation device When,
Flow rate adjusting means for adjusting the flow rate of the cooling heat exchange medium supplied to the second circulation device;
Temperature detecting means for detecting the temperature of the heat exchange medium immediately before flowing into the heat exchanger;
2. A fuel temperature adjusting apparatus comprising: a control means for controlling the heating means and the flow rate adjusting means based on a temperature detected by the temperature detecting means and a preset target temperature of the fuel.

  According to the means 7, basically the same effect as the means 5 can be obtained.

Means 8. In the fuel temperature adjusting device according to any one of means 5 to 7,
The upper limit of the temperature difference between the temperature of the heat exchange medium immediately before flowing into the heat exchanger and the temperature of the heat exchange medium immediately after flowing out of the heat exchanger is actually the target temperature of the fuel and the engine. The heat exchanger is calculated from the maximum heat exchange heat amount of the fuel passing through the first circulation device so that the specific value is not more than half of the allowable temperature difference allowed as the temperature difference with the temperature of the fuel supplied to the fuel. A fuel temperature adjusting device characterized in that the pump means has sufficient heat exchanging capacity to process the quantity of heat and the pump means has sufficient pumping capacity.

  According to the means 8, the same effect as the means 2 can be obtained.

Means 9. In the fuel temperature adjusting device according to means 8,
The heat exchanger has a sufficient heat exchange capability so that the temperature of the fuel flowing out of the heat exchanger becomes substantially equal to the temperature of the heat exchange medium immediately before flowing into the heat exchanger,
The control means is a temperature obtained by adding the specific numerical value to the target temperature of the fuel, or a temperature obtained by subtracting the specific numerical value from the target temperature of the fuel, the temperature of the heat exchange medium immediately before flowing into the heat exchanger. The fuel temperature adjusting device is characterized by controlling the heating means and the flow rate adjusting means.

  According to the means 9, the same effect as the means 3 can be obtained.

Means 10. In the fuel temperature adjusting device according to any one of means 5 to 9,
The control means sets the set value of the temperature of the heat exchange medium immediately before flowing into the heat exchanger,
When the target temperature of the fuel is equal to or higher than a predetermined numerical value set in advance, a temperature obtained by adding the specific numerical value to the target temperature of the fuel,
When the target temperature of the fuel is lower than the specified value, the heating means and the flow rate adjusting means are controlled so as to obtain a set value of each heat exchange medium temperature by subtracting the specific value from the target temperature of the fuel. A fuel temperature adjusting device.

  According to the means 10, the same effect as the means 4 can be obtained.

Means 11. In the fuel temperature adjusting device according to any one of means 1 to 10,
The heating means is provided in the flow path of the heat exchange medium, and is sufficient to allow the heat exchange medium to be heated to a temperature substantially equal to the target temperature of the fuel by passing through the flow path. A fuel temperature adjusting device characterized by having a large amount of exchange heat.

  As a means for heating the heat exchange medium, for example, it can be considered that the heat exchange medium is stored in a tank and then heated by an electric heater or the like. However, when it is necessary to cool the heated heat exchange medium, it is necessary to cool all of the heat exchange medium stored in the tank, and there is a possibility that it takes time for the cooling.

  In this regard, according to the means 11, since the heating means is provided in the flow path of the heat exchange medium, it is not necessary to heat more heat exchange medium than necessary. Therefore, even if it is necessary to cool the heat exchange medium, the cooling can be performed quickly, and controllability can be improved. Further, the heating means has an exchange heat quantity that can make the temperature of the heat exchange medium that has passed through the flow path substantially equal to the target temperature of the fuel. As such a heating means, for example, by passing through a flow path provided with the heating means, the heat exchange medium can be set from a lower limit temperature (for example, −10 ° C.) of a fuel temperature range that can be set in the performance evaluation test. Those that can be heated to the upper limit temperature (for example, 75 ° C.) of the temperature range of the fuel that can be set in the performance evaluation test are used. By using such heating means, the heat exchange medium can be instantaneously brought to a temperature substantially equal to the target temperature of the fuel. As a result, the controllability can be further improved.

Means 12. In the fuel temperature adjusting device according to any one of means 1 to 11,
An input means for setting and inputting the target temperature of the fuel;
A fuel temperature adjusting device characterized in that, when the fuel to be supplied is gasoline, the maximum target temperature that can be set and input is lower than when the fuel to be supplied is light oil.

  In the engine performance evaluation test, there are cases where the fuel to be supplied is gasoline and light oil depending on the type of engine. In this regard, according to the means 12, the input means for setting and inputting the target temperature of the fuel is provided, and when the fuel to be supplied is gasoline, the highest target that can be set and inputted compared to the case of light oil. The temperature is set to a low temperature. As a result, when the fuel to be supplied is gasoline, a high target temperature can be set, and problems due to this can be prevented, and a performance evaluation test can be performed more safely. it can.

Means 13. In the fuel temperature adjusting device according to any one of means 1 to 12,
The fuel temperature adjusting device according to claim 1, wherein the heat exchanger is a countercurrent type.

  According to the means 13, the heat exchanger is a countercurrent heat exchanger in which the fuel and the heat exchange medium flow in opposite directions via the heat transfer plate. Therefore, the temperature of the heat exchange medium and the temperature of the fuel can be made closer, as compared with a parallel flow type heat exchanger in which the fuel and the heat exchange medium flow in the same direction via the heat transfer plate. The temperature of the fuel can be made closer to the target temperature.

Hereinafter, embodiments will be described with reference to the drawings.
[First Embodiment]
FIG. 1 is an explanatory diagram showing a schematic configuration of a fuel temperature adjusting device 1, a gasoline engine 2, and the like in the engine test chamber 100. In the present embodiment, it is assumed that a gasoline engine 2, an existing refrigerator 3, and a fuel tank 17 in which gasoline is stored are installed in the engine test chamber 100. In the present embodiment, the temperature difference (referred to as “allowable temperature difference”) that the tester can accept as the temperature difference between the target temperature of the fuel and the temperature of gasoline supplied to the gasoline engine 2 is set to be relatively small. It shall be. Specifically, the allowable temperature difference is set to “1 ° C.” (the difference from the target fuel temperature is plus or minus 1 ° C.).

  The fuel temperature adjusting device 1 includes a first circulation device 4, a second circulation device 5, a third circulation device 6, a heat exchanger 7, a cooling heat exchanger 8, and a controller 9.

  The first circulation device 4 includes a first feed side flow path 10, a fuel supply flow path 11, a regulator 12, a fuel gauge 13, a first pressure feed pump 14, a first control valve 15, and a first return. Side flow path 16.

  The first feed side flow path 10 is a path connecting the fuel tank 17 and the heat exchanger 7, and is for supplying gasoline toward the heat exchanger 7. In the present embodiment, the same amount of gasoline as consumed by the gasoline engine 2 is replenished from the fuel tank 17 to the junction of the first feed side channel 10 and the first return side channel 16. . However, the temperature of the gasoline supplied from the fuel tank 17 to the junction of the first feed-side flow path 10 and the first return-side flow path 16 is normal temperature (20 ° C. in this embodiment). The fuel supply passage 11 is a path connecting the heat exchanger 7 and the gasoline engine 2, and is for supplying gasoline to the gasoline engine 2. The regulator 12 provided in the middle of the fuel supply flow path 11 has a path that branches in two directions, and is an orifice that can mechanically set the supply pressure to the subsequent stage of each path. While flowing into the gasoline engine 2, unnecessary gasoline is returned to the first return side passage 16. The fuel gauge 13 is provided in the middle of the intersection of the first feed-side channel 10 and the first return-side channel 16 from the fuel tank 17, and measures the flow rate of gasoline replenished from the fuel tank 17. is there. The first pressure feed pump 14 is provided on the downstream side of the fuel gauge 13, and gasoline circulates with the operation of the first pressure feed pump 14. The first control valve 15 is provided in a flow path between the fuel gauge 13 and the first pressure feed pump 14, and adjusts the flow rate of gasoline supplied toward the heat exchanger 7. The first return-side flow path 16 is a flow path that connects the fuel supply flow path 11 (the regulator 12) and the first feed-side flow path 10 between the flow meter 13 and the first control valve 15. This is for returning the gasoline that has not been supplied to the engine 2 toward the first feed-side flow path 10. Under such a configuration, in the first circulation device 4, the gasoline replenished from the fuel tank 17 passes through the first feed-side flow path 10, passes through the heat exchanger 7 and the fuel supply flow path 11 in this order, and the required amount. Of gasoline is supplied to the gasoline engine 2. Furthermore, unnecessary gasoline can be circulated through the first return side flow path 16 to return to the first feed side flow path 10 (in the direction of the white arrow in the figure).

  The second circulation device 5 includes a second feed side flow path 18, a second return side flow path 19, a second pressure feed pump 20, an electric heater 21, and a temperature detection sensor 22.

  The second feed side flow path 18 is a path connecting between the heat exchanger 8 for cooling and the heat exchanger 7, and is for supplying brine as a heat exchange medium toward the heat exchanger 7. It is. On the other hand, the second return side channel 19 is a path connecting the heat exchanger 7 and the cooling heat exchanger 8, and returns the brine that has passed through the heat exchanger 7 to the cooling heat exchanger 8. Is for. The second pressure feed pump 20 is provided in the second return side flow path 19, and the brine circulates with the operation of the second pressure feed pump 20. The electric heater 21 is provided in the second feed side channel 18 and heats the brine in the channel. The electric heater 21 has an annular shape and is provided in the flow path, and a thyristor circuit is incorporated outside the power supply as an output control device so that the amount of heat generated can be continuously changed. It has become. In addition, the electric heater 21 has sufficient heating capability to instantaneously bring the brine passing through the flow path to a relatively high temperature (75 ° C. in this embodiment), and the cooling heat exchanger Those having an exchange heat quantity (heating capacity) substantially equal to the exchange heat quantity (cooling capacity) of 8 are used. The temperature detection sensor 22 is provided at a site immediately before the brine flows into the heat exchanger 7 and detects the temperature of the brine at the site. Under this configuration, the brine returns from the cooling heat exchanger 8 to the cooling heat exchanger 8 through the second feed-side channel 18, through the heat exchanger 7, through the second return-side channel 19. So that it can be circulated (in the direction of the black arrow in the figure).

  The third circulation device 6 includes a third feed side channel 23, a third return side channel 24, and a main control valve 25.

  Here, as described above, the refrigerator 3 is installed in the engine test chamber 100, but the refrigerator 3 can cool a cooling brine different from the brine of the second circulation device 5. Yes, it has an inlet and an outlet.

  The third feed-side flow path 23 is a path connecting the outlet of the refrigerator 3 and the cooling heat exchanger 8 and is used to supply cooling brine to the cooling heat exchanger 8. It is. On the other hand, the third return-side flow path 24 is a path connecting between the cooling heat exchanger 8 and the inlet of the refrigerator 3, and for the cooling through the cooling heat exchanger 8 with respect to the refrigerator 3. To return the brine. The main control valve 25 is provided in the third return side flow path 24 so that the amount of cooling brine supplied to the cooling heat exchanger 8 can be continuously adjusted. Under this configuration, the cooling brine passes from the cooling heat exchanger 8 through the third return-side flow path 24, passes through the refrigerator 3, passes through the second feed-side flow path 23, and passes through the cooling heat exchanger 8. It can be circulated to return to (the direction of the arrow with a dotted pattern in the figure). In addition, there may be a case where the third feed side flow path and the third return side flow path of another fuel temperature adjusting device are connected in parallel to the refrigerator 3. A pipe provided with a direction valve may be provided.

  The heat exchanger 7 performs heat exchange between gasoline flowing on the first circulation device 4 side and brine flowing on the second circulation device 5 side. The heat exchanger 7 is a countercurrent heat exchanger, and is configured such that gasoline and brine flow indirectly in the reverse direction via a heat transfer plate.

  The cooling heat exchanger 8 performs heat exchange between the brine flowing on the second circulation device 5 side and the brine flowing on the third circulation device 6 side. That is, the brine that flows on the second circulation device 5 side is cooled by the cooling brine that flows on the third circulation device 6 side, and the cooling brine that flows on the third circulation device 6 side by the brine that flows on the second circulation device 5 side. Heat is exchanged by heating. The cooling heat exchanger 8 has a sufficient cooling capacity so that the brine flowing through the second circulation device 5 can be quickly cooled to a low temperature (−10 ° C. in the present embodiment) comparable to a cold region. have. Furthermore, as described above, as the cooling heat exchanger 8, a cooling heat exchanger 8 having an exchange heat quantity (cooling capacity) substantially equal to the exchange heat quantity (heating capacity) of the electric heater 21 is used.

  The controller 9 is embodied by a computer system, particularly a sequencer. The electric heater 21 and the main control valve 25 are controlled based on the brine temperature detected by the temperature detection sensor 22 and the gasoline target temperature. In addition, a setting input means (not shown) such as a keyboard and a touch panel is electrically connected to the controller 9. By operating the setting input means, the target temperature and the type of fuel (this embodiment) In the form, gasoline and light oil) can be input. Further, the controller 9 has information about the maximum target temperature (referred to as “maximum temperature that can be set”, which is 25 ° C. in the present embodiment) that can be set and inputted when the fuel is gasoline, and heating of the brine described later. In the control and cooling control, prescribed numerical values serving as control switching criteria are stored in advance. The default value can be changed. In addition, when the input fuel is gasoline, the controller 9 determines whether the target temperature is equal to or lower than the settable maximum temperature, and the target temperature is lower than the settable maximum temperature. If it is larger, it has a function of determining that the input target temperature is invalid and prompting the input of the target temperature again (referred to as an “incorrect input prevention function”).

  In the present embodiment, the upper limit of the temperature difference between the temperature of the brine immediately before flowing into the heat exchanger 7 and the temperature of the brine immediately after flowing out of the heat exchanger 7 (referred to as “temperature difference between inlet / outlet”). Is a value less than half of the allowable temperature difference (referred to as “specific value”, which is 0.3 ° C. in the present embodiment), and the temperature of gasoline flowing out from the heat exchanger 7 and heat The heat exchanger 7 and the second pumping pump 20 are used so that the temperature of the brine flowing into the exchanger 7 becomes substantially equal even at the maximum load. That is, the heat exchanger 7 has a sufficiently large capacity and a sufficiently large heat transfer area, and the second pressure pump 20 can pump a relatively large amount of brine per unit time. Is used.

  In the fuel temperature adjusting device 1 configured as described above, the temperature of gasoline supplied to the gasoline engine 2 can be adjusted. Then, next, operation | movement of the fuel temperature control apparatus 1 made in the temperature control of gasoline is demonstrated.

  When a power supply device (not shown) is activated, power is supplied to the first pressure pump 14, the first control valve 15, the second pressure pump 20, and the like. As a result, each is activated, and gasoline and brine circulate in the flow path.

  Then, the operator inputs information on the fuel type (in this embodiment, gasoline) and the target fuel temperature to the controller 9 via the setting input means. The fuel type and the target temperature may be input in advance. The controller 9 determines whether or not the input target temperature is equal to or lower than the maximum gasoline settable temperature. When the input target temperature is equal to or lower than the maximum settable temperature, the controller 9 compares the target temperature with the temperature of the brine detected by the temperature detection sensor 22 and performs heating control or cooling control of the brine.

  Here, the brine heating control is performed when the actual temperature of the brine (referred to as “actual brine temperature”) is lower than the target temperature. At this time, if the target temperature is lower than the specified value, the temperature of the brine flowing into the heat exchanger 7 is set as a brine temperature setting value that is a target temperature substituting the temperature obtained by subtracting the specific value from the target temperature of the fuel. The controller 9 increases the heat generation amount of the electric heater 21 so as to approach the value, and controls the main control valve 25 to reduce the amount of cooling brine flowing into the cooling heat exchanger 8. On the other hand, when the target temperature is equal to or higher than the specified value, the temperature of the brine flowing into the heat exchanger 7 is set as a brine temperature setting value that replaces the target temperature with a temperature obtained by adding a specific value to the target temperature of the fuel The controller 9 increases the heat generation amount of the electric heater 21 so as to approach the value, and controls the main control valve 25 to reduce the amount of cooling brine flowing into the cooling heat exchanger 8.

  On the other hand, the brine cooling control is performed when the actual brine temperature is equal to or higher than the target temperature. At this time, if the target temperature is less than the specified value, the brine temperature that flows into the heat exchanger 7 is set as the brine temperature setting value that replaces the target temperature with the temperature obtained by subtracting the specific value from the target temperature of the fuel, The controller 9 reduces the amount of heat generated by the electric heater 21 so as to approach the set value, and controls the main control valve 25 to increase the amount of cooling brine that flows into the cooling heat exchanger 8. On the other hand, when the target temperature is equal to or higher than a specified value, the brine temperature that flows into the heat exchanger 7 is set as a brine temperature setting value that replaces the target temperature with a temperature obtained by adding a specific value to the target temperature of the fuel, The controller 9 reduces the amount of heat generated by the electric heater 21 so as to approach the set value, and controls the main control valve 25 to increase the amount of cooling brine that flows into the cooling heat exchanger 8.

  For example, when the input target temperature is “23 ° C.” and the actual brine temperature is “15 ° C.”, the controller 9 performs heating control of the brine. At this time, since the target temperature (23 ° C.) is higher than a set specified numerical value (for example, 20 ° C.), the temperature of the brine immediately before flowing into the heat exchanger 7 is a specific numerical value (in this embodiment, the target temperature). , 0.3 ° C.) is added to the set value (23.3 ° C.), and the heating control of the brine is performed so that the set temperature is reached. On the other hand, for example, when the input target temperature is “−5 ° C.” and the actual brine temperature is “15 ° C.”, the controller 9 performs cooling control of the brine. At this time, since the target temperature (−5 ° C.) is lower than a set specified numerical value (for example, 20 ° C.), the temperature of the brine immediately before flowing into the heat exchanger 7 is determined from the target temperature by a specific numerical value (this embodiment). Then, the temperature (−5.3 ° C.) obtained by subtracting 0.3 ° C. is replaced with a set value, and brine cooling control is performed so that the set temperature is reached.

  The brine temperature information detected by the temperature detection sensor 22 is fed back to the controller 9 as needed. In each case, the temperature of the brine flowing into the heat exchanger 7 is changed to be equal to the temperature obtained by adding the specific numerical value to the target temperature of the fuel or the temperature obtained by subtracting the specific numerical value from the target temperature of the fuel. In addition, necessary control is performed on the electric heater 21 and the main control valve 25, and brine heating control and cooling control are executed.

  As described above in detail, according to the test temperature adjusting apparatus 1 of the present embodiment, the temperature of the brine is quickly adjusted in a wide range from a low temperature to a high temperature by the electric heater 21 and the cooling heat exchanger 8. be able to. As a result, the temperature of gasoline supplied to the gasoline engine 2 can be adjusted in a wide range and quickly.

  In addition, the heat exchanger 7 can indirectly heat the gasoline through the temperature-adjusted brine. Therefore, it is easy to ensure safety as compared with the case where the first circulation device 4 is provided with heating means and the gasoline is directly heated by the heating means. In particular, even when gasoline with a low flash point / ignition point is used as the fuel, it is not directly heated, so a relatively safe test can be realized. As a result, regardless of whether the fuel is gasoline or light oil, fuel at a desired temperature can be stably supplied to the engine.

  Furthermore, the upper limit of the temperature difference between the inlet and outlet is a specific value, and the temperature of gasoline flowing out from the heat exchanger 7 and the temperature of brine flowing into the heat exchanger 7 are substantially equal. 7 and the second pump 20 are used. By providing the heat exchanger 7 and the pressure feed pump 20 as described above, the temperature difference between the inlet and outlet can be kept within a relatively small range regardless of the flow rate and temperature of gasoline flowing into the heat exchanger 7. Thereby, it is possible to prevent the temperature of gasoline flowing out from the heat exchanger 7 from being varied, and as a result, it is possible to supply gasoline having a substantially constant temperature to the gasoline engine 2. In addition, the controller 9 sets the temperature of the brine immediately before flowing into the heat exchanger 7 to a temperature obtained by adding a specific value to the target temperature when the target temperature is equal to or higher than a specified value. When the temperature is lower than the specified value, the temperature is obtained by subtracting the specific value from the target temperature. Thereby, the temperature of the brine flowing into the heat exchanger 7 and the temperature of the brine flowing out of the heat exchanger 7 are set between the target temperature and the temperature obtained by adding a specific numerical value to the target temperature, or between the target temperature and the target temperature. It can be stored between the temperature and a temperature obtained by subtracting a specific numerical value. That is, the temperature of the brine flowing through the heat exchanger 7 can be set to a temperature substantially equal to the target temperature at any part in the heat exchanger 7. Depending on the test conditions, the allowable temperature difference allowed for the target temperature of the fuel is allowed to be higher from the target temperature or lower than the target temperature, rather than being the same numerical value around the target temperature. Many are acceptable. If the purpose of the test has the meaning of high temperature test or low temperature test after the specified value, if the allowable value is set to high temperature test, the target temperature of the fuel is cleared and allowed to be higher. The target temperature is cleared and allowed to be lower. Therefore, adding or subtracting a specific value from the target temperature of the fuel in accordance with this allowable temperature setting is advantageous for making the temperature of the fuel flowing out of the heat exchanger very close to the target temperature. is there. Therefore, the temperature of gasoline flowing out from the heat exchanger 7 can be set to a temperature very close to the target temperature, and the test accuracy can be dramatically improved.

  In addition, if the temperature detection sensor 22 is provided immediately after the gasoline has flowed out of the heat exchanger 7, if the gasoline flow rate fluctuates rapidly, the controller against the temperature fluctuation of the gasoline. 9 control may not follow. As a result, the difference between the temperature of the gasoline supplied to the gasoline engine 2 and the target temperature may increase. On the other hand, the temperature detection sensor 22 is provided in the site | part just before a brine flows in into the heat exchanger 7. FIG. Further, since the flow rate of the brine circulating in the second circulation device is substantially constant, the detected temperature fluctuation is relatively gradual. Therefore, the said malfunction can be wiped off and it can prevent that the difference of target temperature and the temperature of the gasoline actually supplied increases.

  Furthermore, the amount of exchange heat (cooling capacity) of the cooling heat exchanger 8 and the amount of exchange heat (heating capacity) of the electric heater 20 are substantially equal. Thereby, the temperature of a brine can be controlled instantaneously and by extension, the temperature of gasoline can be controlled instantaneously. Furthermore, since the electric heater 20 is provided in the flow path of the brine, it is not necessary to heat more brine than necessary. Moreover, since the electric heater 20 has a heating capability that can instantaneously make the temperature of the brine that has passed through the flow path relatively high, the brine can be instantaneously set to a temperature substantially equal to the target temperature. As a result, controllability can be further improved.

Further, when the fuel to be supplied is gasoline, the controller 9 is provided with an erroneous input prevention function for determining that the target temperature exceeding the maximum settable temperature is invalid. Therefore, when the fuel is gasoline, a high target temperature can be set, and problems due to this can be prevented, and the performance evaluation test can be performed more safely.
[Second Embodiment]
Next, a second embodiment will be described. FIG. 2 is an explanatory diagram showing a schematic configuration of the fuel temperature adjusting device 31, the diesel engine 32, and the like in the engine test chamber 101. In the present embodiment, it is assumed that a diesel engine 32, an existing refrigerator 33, and a fuel tank 47 in which light oil as fuel is stored are installed in the engine test chamber 101. A fuel pump 56 for pumping light oil is provided inside the diesel engine 32. In addition, the refrigerator 33 has a sufficient cooling capacity so that the brine, which is a heat exchange medium, can be quickly cooled to a low temperature (−10 ° C. in the present embodiment) comparable to a cold district. . In addition, in this embodiment, a temperature difference (referred to as “allowable temperature difference”) that can be allowed by the tester is set as a temperature difference between the target temperature of the fuel and the temperature of the light oil supplied to the diesel engine 32. It shall be. Specifically, the allowable temperature difference is set to “1 ° C.” (the difference from the target temperature is plus or minus 1 ° C.).

  The fuel temperature adjustment device 31 includes a first circulation device 34, a second circulation device 35, a third circulation device 36, a heat exchanger 37, and a controller 39.

  The first circulation device 34 includes a first feed side flow path 40, a fuel supply flow path 41, a fuel gauge 43, a first pressure feed pump 44, a first control valve 45, and a first return side flow path 46. And a strainer 57.

  The first feed side flow path 40 is a path that connects the fuel tank 47 and the heat exchanger 37, and supplies light oil toward the heat exchanger 37. In the present embodiment, the same amount of light oil consumed by the diesel engine 32 is supplied from the fuel tank 47. However, the temperature of the light oil supplied from the fuel tank 47 to the intersection of the first feed side flow path 40 and the first return side flow path 46 is normal temperature (25 ° C. in this embodiment). The fuel supply flow path 41 is a path connecting the heat exchanger 37 and the diesel engine 32, and is for supplying light oil toward the diesel engine 32. The fuel gauge 43 is provided in the middle of the first feed-side flow path 40 and measures the flow rate of light oil replenished from the fuel tank 47. The first pressure feed pump 44 is provided on the upstream side of the fuel gauge 43, and light oil is sent to the engine as the first pressure feed pump 44 operates. The first control valve 45 is provided on the downstream side of the fuel gauge 43 and adjusts the flow rate of light oil supplied to the heat exchanger 37. The first return side flow path 46 is a flow path connecting the flow path on the downstream side of the fuel pump 56 in the diesel engine 32 and the first feed side flow path 40 on the downstream side of the first control valve 45, The surplus light oil that has not been consumed by the diesel engine 32 is returned to the first feed side flow path 40. The fuel pump 56 is a high-pressure pump, and does the first return-side flow path 46 always have the same pressure as the first feed-side flow path at the intersection of the first feed-side flow path 40 and the first return-side flow path 46? Or kept at a high pressure. The strainer 57 is provided in a flow path between the fuel gauge 43 and the first pressure feed pump 44, and removes impurities remaining in the light oil. Under such a configuration, in the first circulation device 34, the light oil replenished from the fuel tank 47 passes through the first feed-side flow path 40, passes through the heat exchanger 37 and the fuel supply flow path 41 in this order, and is a diesel engine. 32. Further, the light oil that has not been consumed can be circulated so as to return to the first feed-side channel 40 through the first return-side channel 46 (in the direction of the white arrow in the figure).

  The second circulation device 35 includes a second feed side flow channel 48, a second return side flow channel 49, a second pressure feed pump 50, an electric heater 51, and a temperature detection sensor 52.

  The second feed side flow path 48 is a path connecting the third circulation device 36 and the heat exchanger 37, and is for supplying brine to the heat exchanger 37. On the other hand, the second return side flow path 49 is a path connecting the heat exchanger 37 and the third circulation device 36, and returns the brine that has passed through the heat exchanger 37 to the third circulation device 36. Is. The second pressure feed pump 50 is provided in the second feed side flow path 48, and the brine circulates through a bypass flow path 59 described later with the operation of the second pressure feed pump 50. The electric heater 51 is provided in the second feed-side channel 48 and heats the brine in the channel. The electric heater 51 has an annular shape and is provided in the flow path, and a thyristor circuit is incorporated outside the power supply as its output control device so that the amount of heat generated can be continuously changed. It has become. In addition, the electric heater 21 has a sufficient heating capacity so that the brine passing through the flow path can be instantaneously brought to a relatively high temperature (75 ° C. in this embodiment). The temperature detection sensor 52 is provided at a site immediately before the brine flows into the heat exchanger 37, and detects the temperature of the brine at the site. Under such a configuration, the brine passes from the third circulation device 36 through the second feed-side channel 48, through the heat exchanger 37, through the second return-side channel 49, and through a bypass channel 59 described later. It can circulate back to the third circulation device (in the direction of the black arrow in the figure).

  The third circulation device 36 includes a third feed side flow channel 53, a third return side flow channel 54, a main control valve 55, and a bypass control valve 58. In addition, a bypass channel 59 that connects the third feed-side channel 53 and the third return-side channel 54 is provided.

  Here, although the point where the refrigerator 33 is installed in the engine test chamber 101 has already been described, the refrigerator 33 can cool the brine and has an inlet and an outlet.

  The third feed side flow path 53 is a path connecting the outlet of the refrigerator 33 and the second circulation device 35, and is for supplying relatively low temperature brine to the second circulation device 35. is there. The third feed side channel 53 has an intersection with the bypass channel 59, and a part of the brine of the third circulation device 35 is mixed from the bypass channel 59. Here, the brine circulating through the second circulation device 35 is cooled by mixing the relatively low-temperature brine and the brine circulating through the second circulation device 35. On the other hand, the third return side flow path 54 is a path connecting the second circulation device 35 and the inlet of the refrigerator 33, and a part of the brine that has passed through the second circulation device 35 with respect to the refrigerator 33. It is for returning. The main control valve 55 is provided in the third feed-side flow path 53 so that the amount of relatively low-temperature brine supplied to the second circulation device 35 can be continuously adjusted. The bypass control valve 58 is provided in the bypass flow path 59 so that the amount of brine flowing into the third feed-side flow path 53 through the bypass flow path 59 can be continuously adjusted. Under such a configuration, the brine passes from the second circulation device 35 through the third return side flow channel 54, passes through the refrigerator 33 and / or the bypass flow channel 59, passes through the third feed side flow channel 53, and passes through the second circulation device 35. It is possible to circulate back to 35 (in the direction of the arrow with a dotted pattern in the figure).

  The heat exchanger 37 performs heat exchange between the light oil flowing on the first circulation device 34 side and the brine flowing on the second circulation device 35 side. The heat exchanger 37 is a countercurrent heat exchanger, and is configured such that light oil and brine flow indirectly in the reverse direction via a heat transfer plate.

  The controller 39 is embodied by a computer system, particularly a sequencer. Then, the electric heater 51, the main control valve 55, and the bypass control valve 58 are controlled based on the brine temperature and the light oil target temperature detected by the temperature detection sensor 52. In addition, a setting input means (not shown) such as a keyboard or a touch panel is electrically connected to the controller 39. By operating the setting input means, the target temperature and the type of fuel (main book) In the embodiment, gasoline and light oil) can be input. Furthermore, information on the maximum target temperature (75 ° C. in the present embodiment) that can be set and inputted when the supply target is light oil, and a prescribed numerical value that serves as a control switching reference in brine heating control and cooling control to be described later Is stored in advance. In addition, when the input fuel is gasoline, the controller 39 determines whether or not the target temperature falls below the settable maximum temperature, and the target temperature is less than the settable maximum temperature. If it is larger, it has a function of determining that the input target temperature is invalid and prompting the input of the target temperature again.

  Note that the upper limit of the temperature difference between the temperature of the brine immediately before flowing into the heat exchanger 37 and the temperature of the brine immediately after flowing out of the heat exchanger 37 is a value less than half of the allowable temperature difference (“specific” The temperature of the light oil flowing out from the heat exchanger 37 and the temperature of the brine flowing into the heat exchanger 37 are substantially equal. The heat exchanger 37 and the second pumping pump 50 are used. That is, as the heat exchanger 37, one having a sufficiently large capacity and a sufficiently large heat transfer area is used, and as the second pumping pump 50, the brine can be pumped in a relatively large amount per unit time. Is used.

In the fuel temperature adjusting device 31 configured as described above, the temperature of the light oil supplied to the diesel engine 32 can be adjusted. Therefore, next, the operation of the fuel temperature adjusting device 31 performed in the temperature adjustment of the light oil will be described. By starting a power supply device (not shown), the first pressure feed pump 44, the first control valve 45, and the second pressure feed pump 50 will be described. Etc. are supplied with power. Thereby, it will be in an activated state, respectively, and light oil and brine will circulate in the flow path.

  Then, the operator inputs information on the fuel type (light oil in the present embodiment) and the target temperature of the light oil supplied to the diesel engine 32 to the controller 39 via the setting input means. The fuel type and the target temperature may be input in advance. Since “light oil” is input as the fuel type, the controller 39 compares the input target temperature with the brine temperature detected by the temperature detection sensor 52 and performs heating control or cooling control of the brine.

  Here, the brine heating control is performed when the actual temperature of the brine (referred to as “actual brine temperature”) is lower than the target temperature. At this time, if the target temperature is lower than the specified value, the temperature of the brine flowing into the heat exchanger 37 is set by subtracting the specific value from the target temperature of the fuel as the brine temperature setting value instead of the target temperature. The controller 39 increases the heat generation amount of the electric heater 51 so as to approach the value, and controls the main control valve 55 and the bypass control valve 58 to reduce the amount of relatively low-temperature brine flowing into the second circulation device 35. Let On the other hand, if the target temperature is equal to or higher than the specified value, the temperature of the brine flowing into the heat exchanger 37 is set as a brine temperature setting value that replaces the target temperature with a temperature obtained by adding a specific value to the target temperature of the fuel The controller 39 increases the heat generation amount of the electric heater 51 so as to approach the value, and controls the main control valve 55 and the bypass control valve 58 to reduce the amount of relatively low-temperature brine flowing into the second circulation device 35. Let

  On the other hand, the brine cooling control is performed when the actual brine temperature is equal to or higher than the target temperature. At this time, if the target temperature is less than the specified value, the brine temperature flowing into the heat exchanger 37 is set as a brine temperature setting value that replaces the target temperature with a temperature obtained by subtracting a specific value from the target temperature of the fuel. The controller 39 reduces the amount of heat generated by the electric heater 51 so as to approach the set value, controls the main control valve 55 and the bypass control valve 58, and sets the amount of relatively low-temperature brine to flow into the second circulation device 35. Increase. On the other hand, when the target temperature is equal to or higher than a specified value, the brine temperature flowing into the heat exchanger 37 is set as a brine temperature setting value that replaces the target temperature with a temperature obtained by adding a specific value to the target temperature of the fuel, The controller 39 reduces the amount of heat generated by the electric heater 51 so as to approach the set value, controls the main control valve 55 and the bypass control valve 58, and sets the amount of relatively low-temperature brine to flow into the second circulation device 35. Increase.

  For example, when the input target temperature is “70 ° C.” and the actual brine temperature is “25 ° C.”, the controller 39 controls the heating of the brine. At this time, since the target temperature (70 ° C.) is higher than a set specified numerical value (for example, 60 ° C.), the temperature of the brine immediately before flowing into the heat exchanger 37 is set to a specific numerical value (in this embodiment). , 0.3 ° C.) is substituted for the set value (70.3 ° C.), and the heating control of the brine is performed so that the set temperature is reached. On the other hand, for example, when the input target temperature is “5 ° C.” and the actual brine temperature is “25 ° C.”, the controller 39 performs cooling control of the brine. At this time, since the target temperature (5 ° C.) is lower than the set specified numerical value (for example, 60 ° C.), the temperature of the brine immediately before flowing into the heat exchanger 37 is changed from the target temperature to a specific numerical value (in this embodiment). , 0.3 ° C.) is subtracted from the set value (4.7 ° C.), and brine cooling control is performed so that the set temperature is reached.

  Further, the brine temperature information detected by the temperature detection sensor 52 is fed back to the controller 39 as needed. Each time, the temperature of the brine flowing into the heat exchanger 37 is changed to be equal to the temperature obtained by adding the fuel target temperature and the specific numerical value, or the temperature obtained by subtracting the specific numerical value from the fuel target temperature. In addition, necessary control is performed on the electric heater 51, the main control valve 55, and the bypass control valve 58, and brine heating control and cooling control are executed.

  Also in the fuel temperature adjusting device 31 of the present embodiment, basically the same effects as the effects of the first embodiment can be achieved.

  In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows. Of course, other application examples and modification examples not illustrated below are also possible.

  (A) In the first embodiment, the fuel temperature adjusting device 1 is used for the gasoline engine 2, and in the second embodiment, the fuel temperature adjusting device 31 is used for the diesel engine 32. The fuel temperature adjusting device 31 may be used for 2, or the fuel temperature adjusting device 1 may be used for the diesel engine 32. That is, the fuel temperature adjusting devices 1 and 31 can be used regardless of the type of engine.

  (B) The fuel temperature adjusting devices 1 and 31 in the above embodiment need only be able to supply at least gasoline and light oil, and can supply other fuel (for example, alcohol fuel such as ethanol). Good.

  (C) Instead of the third circulation device 6 and the cooling heat exchanger 8 in the first embodiment, the fuel temperature adjusting device 1 may be configured by providing the third circulation device 36 in the second embodiment. Good. The fuel temperature adjusting device 31 may be configured by providing the third circulation device 6 and the cooling heat exchanger 8 in the first embodiment instead of the third circulation device 36 in the second embodiment. . That is, as a cooling means, a means for indirectly cooling using a heat exchanger may be employed, or a means for directly cooling by mixing a relatively low temperature brine may be employed.

  (D) In the above embodiment, the existing refrigerators 3 and 33 and the fuel tanks 17 and 47 are installed in the engine test chambers 100 and 101. However, the refrigerators 3 and 33 and the fuel tanks 17 and 47 are engine tests. It may be installed outside the chambers 100 and 101. Further, either one of the refrigerators 3 and 33 and the fuel tanks 17 and 47 may be installed in the engine test chambers 100 and 101, and the other may be installed outside the engine test chambers 100 and 101.

It is explanatory drawing which shows the outline of the fuel temperature control apparatus etc. in the engine test chamber in 1st Embodiment. It is explanatory drawing which shows the outline of the fuel temperature control apparatus etc. in the engine test chamber in 2nd Embodiment.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1,31 ... Fuel temperature control apparatus, 2 ... Gasoline engine, 3,33 ... Refrigerator, 4,34 ... 1st circulation device, 5,35 ... 2nd circulation device, 6,36 ... 3rd circulation device, 7, 37 ... heat exchanger, 8 ... cooling heat exchanger as cooling means, 9, 39 ... controller as control means, 20, 50 ... second pumping pump as pump means, 21, 51 ... electricity as heating means Heater, 22, 52 ... Temperature detection sensor as temperature detection means, 25, 55 ... Main control valve as flow rate adjustment means, 32 ... Diesel engine, 58 ... Bypass control valve as flow rate adjustment means.

Claims (13)

A fuel temperature adjusting device capable of supplying fuel adjusted to various temperatures to the engine for testing a gasoline engine or a diesel engine provided in an engine test chamber,
A first circulation device for circulatingly supplying fuel to the engine;
A second circulation device comprising pump means for circulating the heat exchange medium;
A heat exchanger for exchanging heat between the fuel circulating in the first circulation device and the heat exchange medium circulating in the second circulation device;
Heating means for heating the heat exchange medium of the second circulation device;
Cooling means for cooling the heat exchange medium of the second circulation device;
Temperature detecting means for detecting the temperature of the heat exchange medium immediately before flowing into the heat exchanger;
2. A fuel temperature adjusting apparatus comprising: a control unit that controls the heating unit and the cooling unit based on a temperature detected by the temperature detection unit and a preset target temperature of the fuel. The fuel temperature adjusting device according to claim 1,
The upper limit of the temperature difference between the temperature of the heat exchange medium immediately before flowing into the heat exchanger and the temperature of the heat exchange medium immediately after flowing out of the heat exchanger is actually the target temperature of the fuel and the engine. The heat exchanger is calculated from the maximum heat exchange heat amount of the fuel passing through the first circulation device so that the specific value is not more than half of the allowable temperature difference allowed as the temperature difference with the temperature of the fuel supplied to the fuel. A fuel temperature adjusting device characterized in that the pump means has a sufficient heat exchanging capacity to process the quantity of heat and the pump means has a sufficient pumping capacity. The fuel temperature control apparatus according to claim 2, wherein
The heat exchanger has a sufficient heat exchange capability so that the temperature of the fuel flowing out of the heat exchanger becomes substantially equal to the temperature of the heat exchange medium immediately before flowing into the heat exchanger,
The control means is a temperature obtained by adding the specific numerical value to the target temperature of the fuel, or a temperature obtained by subtracting the specific numerical value from the target temperature of the fuel, the temperature of the heat exchange medium immediately before flowing into the heat exchanger. The fuel temperature control apparatus controls the heating means and the cooling means. The fuel temperature adjusting device according to any one of claims 1 to 3,
The control means sets the set value of the temperature of the heat exchange medium immediately before flowing into the heat exchanger,
When the target temperature of the fuel is equal to or higher than a predetermined numerical value set in advance, a temperature obtained by adding the specific numerical value to the target temperature of the fuel,
When the target temperature of the fuel is less than the specified value, the heating unit and the cooling unit are controlled so as to be a temperature obtained by subtracting the specific value from the target temperature of the fuel to be a set value of each heat exchange medium temperature. A fuel temperature control device. A fuel temperature adjusting device capable of supplying fuel adjusted to various temperatures to the engine for testing a gasoline engine or a diesel engine provided in an engine test chamber,
A first circulation device for circulatingly supplying fuel to the engine;
A second circulation device comprising pump means for circulating the heat exchange medium;
A heat exchanger for exchanging heat between the fuel circulating in the first circulation device and the heat exchange medium circulating in the second circulation device;
Heating means for heating the heat exchange medium of the second circulation device;
In addition to the heat exchange medium circulating in the second circulation device, a third circulation device in which a cooling heat exchange medium circulates;
Heat for cooling that performs heat exchange between the heat exchange medium that circulates in the second circulation device and the heat exchange medium that circulates in the third circulation device, and cools the heat exchange medium that circulates in the second circulation device An exchange,
A flow rate adjusting means for adjusting a flow rate of the cooling heat exchange medium supplied to the cooling heat exchanger;
Temperature detecting means for detecting the temperature of the heat exchange medium immediately before flowing into the heat exchanger;
2. A fuel temperature adjusting apparatus comprising: a control means for controlling the heating means and the flow rate adjusting means based on a temperature detected by the temperature detecting means and a preset target temperature of the fuel. The fuel temperature adjusting device according to claim 5, wherein
The fuel temperature adjusting device, wherein the amount of exchange heat in the heat exchanger for cooling and the amount of exchange heat of the heating means are substantially equal. A fuel temperature adjusting device capable of supplying fuel adjusted to various temperatures to the engine for testing a gasoline engine or a diesel engine provided in an engine test chamber,
A first circulation device for circulatingly supplying fuel to the engine;
A second circulation device comprising pump means for circulating the heat exchange medium;
A heat exchanger for exchanging heat between the fuel circulating in the first circulation device and the heat exchange medium circulating in the second circulation device;
Heating means for heating the heat exchange medium of the second circulation device;
A third circulation device connected to the second circulation device and capable of supplying a cooling heat exchange medium for cooling the heat exchange medium by being mixed with a heat exchange medium circulating in the second circulation device When,
Flow rate adjusting means for adjusting the flow rate of the cooling heat exchange medium supplied to the second circulation device;
Temperature detecting means for detecting the temperature of the heat exchange medium immediately before flowing into the heat exchanger;
2. A fuel temperature adjusting apparatus comprising: a control means for controlling the heating means and the flow rate adjusting means based on a temperature detected by the temperature detecting means and a preset target temperature of the fuel. The fuel temperature adjusting device according to any one of claims 5 to 7,
The upper limit of the temperature difference between the temperature of the heat exchange medium immediately before flowing into the heat exchanger and the temperature of the heat exchange medium immediately after flowing out of the heat exchanger is actually the target temperature of the fuel and the engine. The heat exchanger is calculated from the maximum heat exchange heat amount of the fuel passing through the first circulation device so that the specific value is not more than half of the allowable temperature difference allowed as the temperature difference with the temperature of the fuel supplied to the fuel. A fuel temperature adjusting device characterized in that the pump means has sufficient heat exchanging capacity to process the quantity of heat and the pump means has sufficient pumping capacity. The fuel temperature control apparatus according to claim 8, wherein
The heat exchanger has a sufficient heat exchange capability so that the temperature of the fuel flowing out of the heat exchanger becomes substantially equal to the temperature of the heat exchange medium immediately before flowing into the heat exchanger,
The control means is a temperature obtained by adding the specific numerical value to the target temperature of the fuel, or a temperature obtained by subtracting the specific numerical value from the target temperature of the fuel, the temperature of the heat exchange medium immediately before flowing into the heat exchanger. The fuel temperature adjusting device is characterized by controlling the heating means and the flow rate adjusting means. The fuel temperature adjusting device according to any one of claims 5 to 9,
The control means sets the set value of the temperature of the heat exchange medium immediately before flowing into the heat exchanger,
When the target temperature of the fuel is equal to or higher than a predetermined numerical value set in advance, a temperature obtained by adding the specific numerical value to the target temperature of the fuel,
When the target temperature of the fuel is lower than the specified value, the heating means and the flow rate adjusting means are controlled so as to obtain a set value of each heat exchange medium temperature by subtracting the specific value from the target temperature of the fuel. A fuel temperature adjusting device. The fuel temperature control apparatus according to any one of claims 1 to 10,
The heating means is provided in the flow path of the heat exchange medium, and is sufficient to allow the heat exchange medium to be heated to a temperature substantially equal to the target temperature of the fuel by passing through the flow path. A fuel temperature adjusting device characterized by having a large amount of exchange heat. The fuel temperature adjusting device according to any one of claims 1 to 11,
An input means for setting and inputting the target temperature of the fuel;
A fuel temperature adjusting device characterized in that, when the fuel to be supplied is gasoline, the maximum target temperature that can be set and input is lower than when the fuel to be supplied is light oil. The fuel temperature adjusting device according to any one of claims 1 to 12,
The fuel temperature adjusting device according to claim 1, wherein the heat exchanger is a countercurrent type.

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