JP4111332B2 - Engine cooling water circulation system for testing - Google Patents

Description

  The present invention relates to a test engine coolant circulation system.

  2. Description of the Related Art Conventionally, engine start tests assuming various environments have been performed. In such a start-up test, an engine mounted on a test bench is used, a circulation path for engine cooling water is provided in the laboratory, and the temperature behavior of the engine cooling water is measured.

  At this time, in the start-up test assuming a cold region, it is necessary to cool the engine in advance, and it is conceivable to cool by the following method.

  First, a method of cooling the engine by lowering the temperature in the laboratory can be considered. However, in this case, since it takes a long time for cooling, this method is not suitable for a case where repeated tests are desired.

  Therefore, it is conceivable to forcibly circulate cooling water having a predetermined temperature such as −10 ° C. using a pump or the like before starting the engine. In this way, the engine can be quickly cooled and repeated tests can be performed (see, for example, Patent Document 1).

  By the way, in the engine mounted in a vehicle, the thermostat is attached to the inflow port of engine cooling water. A thermostat is a device that uses a bimetal or the like to open and close an electric circuit according to temperature and control a heat source to automatically adjust the temperature. In this case, the valve is opened and closed by an electric circuit to adjust the inflow of cooling water. The thermostat opens the valve at a predetermined temperature of 82 ° C., and is closed at a temperature lower than that.

  The engine start test in the laboratory described above uses a thermostat control valve (hereinafter referred to as a “thermostat valve”) attached to an actual vehicle and a valve that is always open (hereinafter referred to as an “open state valve”). ")".

  This will be described below with reference to the drawings. FIG. 3 is an explanatory view showing a conventional engine cooling system.

  Here, the engine 100 arranged in the laboratory and the cooling water circulation device 200 connected to the engine 100 are shown.

  When the engine is started, the cooling water flows from the inflow portion 101 that is the inlet of the cooling water into the main body portion 104 through the inflow valve 102. Then, the cooling water is discharged from the outflow portion 105. This circulation of the cooling water is realized by a water pump 103 attached to the engine 100. The two types of tests described above are different in the inflow valve 102 here, and there are cases where a thermostat valve is used for the inflow valve 102 and an open state valve is used.

  However, when the engine 100 is to be cooled before the engine is started, the thermostat valve is in a closed state until a predetermined temperature is reached, and thus cooling water cannot be fed from the inflow portion 101.

  Therefore, another inlet is used for engine cooling before the engine is started. It is an inflow port through which a heater pipe 106 for heating the passenger compartment in an actual vehicle is interposed.

  As described above, since the engine has two cooling water inlets, conventionally, the engine is cooled by using the inlet on the heater pipe 106 side before the engine is started. In this way, regardless of whether the inflow valve 102 is a thermostat valve or an open state valve, the cooling water can be sent to the engine 100 and the engine 100 can be cooled.

  At this time, how the cooling water circulates will be specifically described.

  Before the engine is started, the cooling water cooled by the cooling device 201 flows into the main body 104 of the engine 100 through the heater pipe 106 from one path 202. And it is discharged | emitted from the outflow part 105, and circulates through the return side path | route 204. FIG. At this time, cooling water is circulated by the pump 205, and the electric three-way valve 206 is switched to the one path 202 side.

  When the cooling of the engine is completed, the engine is started and the test is started.

  After starting the engine, the pump 103 of the engine 100 circulates the cooling water instead of the pump 205. At this time, the electric three-way valve 206 is switched to the other path 203 side, the electric two-way valve 207 is opened to switch the flow path of the pump 205, the electric two-way valve 208 is closed, and normal cooling from the inflow portion 101 is performed. Switch to water circulation path.

  When a thermostat valve is used as the inflow valve 102, the inflow valve 102 is closed until the cooling water reaches a predetermined temperature. The cooling water will circulate. On the other hand, when an open state valve is used for the inflow valve 102, cooling water flows from the second path 203 simultaneously with the engine start.

By using such a cooling system, the engine can be rapidly cooled regardless of whether the inflow valve 102 is a thermostat valve or an open state valve.
JP-A-10-274598

  However, when the engine start test as described above is repeatedly performed, cooling water having a relatively high temperature remains in the other path 203 from the electric three-way valve 206 to the inflow portion 101. This is because in cooling for the next test, the electric three-way valve 206 is switched to the one path 202 side and the engine 100 is cooled, so that the cooling water in the other path 203 does not circulate.

  At this time, when a start test is performed using the open state valve, as described above, the cooling water flows from the other path 203 simultaneously with the engine start, and the relatively high temperature cooling water remaining inside the pipe Will flow into the engine 100.

  As a result, the temperature behavior of the cooling water may be different from the temperature behavior in an actual vehicle, and there is a possibility that the temperature behavior is not appropriate.

  The present invention has been made to solve the above-described problems, and a test engine cooling water circulation system and a test engine that can obtain an appropriate cooling water temperature behavior when an open state valve is used. An object is to provide a cooling device.

  In the following, each means suitable for solving the above-mentioned purpose will be described in terms of items. In addition, the effect etc. peculiar to the means to respond | correspond as needed are added.

Means 1. In an engine cooling water circulation system for testing, comprising an engine having an inlet and an outlet for cooling water that enables circulation of the cooling water, and a circulation device that circulates and supplies the cooling water to the engine.
The engine has, as the inlet, a first inlet through which an inflow valve is interposed and a second inlet through which a heater pipe is interposed,
The circulation device is
Pump means for circulating cooling water;
Cooling means for cooling the cooling water;
A first path for supplying cooling water cooled by the cooling means to the first inlet;
A second path for supplying cooling water cooled by the cooling means to the second inlet,
A test engine cooling water circulation system comprising: a path switching unit capable of switching and setting a path including either the first path or the second path as a cooling water circulation path.

  The engine cooling water circulation system for testing described in the means 1 includes an engine and a circulation device that circulates and supplies the cooling water to the engine in order to install the engine on a test bench for testing. The engine has an inlet and an outlet for cooling water that allow circulation of the cooling water. The inlet has a first inlet through which an inflow valve is interposed and a second inlet through which a heater pipe is interposed. is doing. Regardless of whether the engine is a gasoline engine or a diesel engine, the engine generally has two inlets as described above, and as a result, the system functions for most engines.

  In particular, the circulation device includes a pump unit and a cooling unit, and can circulate and supply the cooling water cooled by the cooling unit.

  Here, the first path is for supplying cooling water to the first inlet of the engine, while the second path is for supplying cooling water to the second inlet of the engine. Then, the cooling water circulation path can be switched and set as a path including either the first path or the second path by the path switching means.

  Conventionally, when cooling the engine before starting the engine, the cooling water is supplied to the second inlet mentioned here. And since the 1st path | pass here was used at the time of engine starting, the high temperature cooling water will remain in the 1st path | route.

  On the other hand, in the present invention, each of the first and second paths is configured to be able to supply the cooling water cooled by the cooling means, and by performing switching setting, the first and second inlets are provided. The cooling water can be selectively supplied.

  Here, if the inflow valve is a thermostat valve, it is in a closed state until the cooling water reaches a predetermined temperature, so the cooling water is supplied to the second inlet using the second path to cool the engine. Like that. On the other hand, if the inflow valve is an open state valve, it is always in an open state, so that cooling water is supplied to the first inlet using the first path to cool the engine.

  In this way, when the open state valve is used, the cooling water is supplied from the first path before starting the engine, so that the high temperature cooling water does not remain in the first path, and the engine starts. Sometimes, hot coolant does not flow into the engine. As a result, an appropriate cooling water temperature behavior can be obtained even when the open state valve is used.

Mean 2. In the engine coolant circulation system according to means 1,
The circulating system for testing is further provided with a control means for controlling the entire apparatus.

  According to the means 2, the circulation device is provided with the control means. For example, the control means is embodied as a computer, and the entire apparatus is controlled by the computer. In this way, control of the entire circulation device is facilitated, which is convenient for the operator.

Means 3. In the engine coolant circulation system according to means 2,
The test engine cooling water circulation system, wherein the control means is configured to control the path switching means based on input information.

  According to the means 3, the control means controls the path switching means based on the input information. For example, by inputting the type of the inflow valve, the path switching means is controlled to set the circulation path including the first path or the second path. In this way, the possibility of erroneous route switching is reduced, which is convenient for the operator.

Means 4. In the engine coolant circulation system according to any one of means 1 to 3,
The test engine coolant circulation system, wherein the path switching means is realized by a three-way valve.

  As shown in the means 4, the path switching means described above can be realized by a three-way valve. At this time, for example, if an electrically controllable electric three-way valve is used, control by a computer or the like becomes possible.

Means 5. In the engine coolant circulation system according to any one of means 1 to 4,
The engine cooling water circulation system for testing, wherein the pump means is provided in a cooling water return side path different from the first path and the second path.

  According to the means 5, the pump means is provided in the return side path, that is, the common part not related to the first path and the second path. In this way, it is sufficient to provide only one pump means in the circulation path, and the configuration of the circulation device is simplified.

Means 6. In the engine coolant circulation system according to any one of means 1 to 5,
The circulation device further includes:
A path not interposing the pump means;
A test engine coolant circulation system, comprising: a pump path switching means for switching to the path and disconnecting the pump means from the circulation path.

  According to the means 6, the circulation device further includes a path not including the pump means and a pump path switching means, and switching to the path by the pump path switching means is possible. Accordingly, since the pump inside the engine is operated after the engine is started, a test after the engine is started can be performed by using the path for cooling the engine by switching to a path not including the pump means.

Mean 7 In the engine coolant circulation system according to any one of means 1 to 6,
The circulation device further includes:
A bypass path for guiding cooling water from the middle of the first path to the return side path from the outlet;
An internal path switching means capable of switching between an internal circulation path which is a circulation path inside the circulation device including the bypass path and a normal circulation path including the engine;
And a heating means for heating the cooling water circulating through the internal circulation path.

  In the test engine coolant circulation system described in the means 7, the circulation device further includes a bypass path, an internal path switching means, and a heating means.

  The bypass path leads the cooling water from the middle of the first path to the return side path from the outflow port. The internal path switching means can switch between an internal circulation path that is a circulation path inside the circulation device including the bypass path and a normal circulation path that includes the engine. The heating means heats the cooling water circulating in the internal circulation path.

  As described above, since the cooling water cooled by the cooling means can be supplied also from the first path, when the thermostat valve is used as the inflow valve, the following problems may occur.

  Since the thermostat valve is in a closed state at the beginning of engine startup, cooling water circulates within the engine after engine startup. The thermostat valve is opened when a predetermined temperature such as 82 ° C. is reached. At this time, if cooling water having a relatively low temperature remains in the first path, the cooling water flows into the engine. Therefore, the thermostat valve may return to the closed state again. Therefore, there is a possibility that the temperature behavior of the cooling water is different from the temperature behavior in an actual vehicle, and there is a possibility that the temperature behavior is not appropriate.

  In contrast, according to the above-described configuration, the cooling water in the first path can be heated in advance by switching to the internal circulation path after the engine is cooled and before the engine is started. Therefore, it is possible to prevent the thermostat valve from returning to the closed state again due to the cooling water flowing into the engine when the thermostat valve is in the open state.

Means 8. In the engine coolant circulation system according to means 7,
The engine cooling water circulation system for testing, wherein the internal path switching means is realized by a three-way valve.

  As shown in the means 8, the internal path switching means can be realized by a three-way valve. At this time, for example, if an electrically controllable electric three-way valve is used, control by a computer or the like becomes possible.

Means 9. In the engine coolant circulation system according to means 7 or 8,
The circulation device further includes a detection unit capable of detecting that the cooling water has reached a predetermined temperature in the internal circulation path,
A test engine coolant circulation system, wherein the internal path switching means is controlled based on a detection result by the detection means.

  According to the means 9, the detection means detects that the cooling water has reached a predetermined temperature, and the internal path switching means is controlled based on the detection result. For example, it is controlled by the control means on the premise of the configuration including the control means. This is advantageous because the switching between the internal circulation path and the normal circulation path is automated.

  The above has been described as an invention of a system including an engine and a circulation device, but can also be realized as an invention of a circulation device as described below.

Means 10. In a test engine cooling water circulation device for supplying cooling water to an engine having an inlet and an outlet for cooling water that enables circulation of the cooling water,
The engine has, as the inlet, a first inlet through which an inflow valve is interposed and a second inlet through which a heater pipe is interposed,
Pump means for circulating cooling water;
Cooling means for cooling the cooling water;
A first path for supplying cooling water cooled by the cooling means to the first inlet;
A second path for supplying cooling water cooled by the cooling means to the second inlet,
A test engine cooling water circulation apparatus comprising: a path switching unit capable of switching and setting a path including either the first path or the second path as a cooling water circulation path.

  The test engine cooling water circulation device described in the means 10 includes a circulation device that circulates and supplies cooling water to the engine. The engine has an inlet and an outlet for cooling water that allow circulation of the cooling water. The inlet has a first inlet through which an inflow valve is interposed and a second inlet through which a heater pipe is interposed. is doing.

  Here, in particular, a pump unit and a cooling unit are provided, and the cooling water cooled by the cooling unit can be circulated and supplied.

  The first path is for supplying cooling water to the first inlet of the engine, while the second path is for supplying cooling water to the second inlet of the engine. Then, the cooling water circulation path can be switched and set as a path including either the first path or the second path by the path switching means.

  In other words, in the present invention, the first and second paths are configured to be able to supply the cooling water cooled by the cooling means, respectively, and by performing the switching setting, the cooling water to the first inlet or the second inlet It was set as the structure which can selectively supply.

  If the inflow valve is a thermostat valve, it is closed until the cooling water reaches a predetermined temperature, so that the cooling water is supplied to the second inlet using the second path to cool the engine. To. On the other hand, if the inflow valve is an open state valve, it is always in an open state, so that cooling water is supplied to the first inlet using the first path to cool the engine.

  In this way, when the open state valve is used, the cooling water is supplied from the first path before the engine is started, so that the relatively high temperature cooling water does not remain in the first path. Such cooling water does not flow into the engine when the engine is started. As a result, an appropriate cooling water temperature behavior can be obtained even when the open state valve is used.

Means 11. In the engine coolant circulation device according to means 10,
Furthermore, the engine cooling water circulation apparatus for a test provided with the control means which controls the whole apparatus.

  According to the means 11, the control means is further provided. For example, the control means is embodied as a computer, and the entire apparatus is controlled by the computer. In this way, control of the entire circulation device is facilitated, which is convenient for the operator.

Means 12. In the engine coolant circulation apparatus according to means 11,
The engine cooling water circulation apparatus for testing, wherein the control means is configured to control the path switching means based on input information.

  According to the means 12, the control means controls the path switching means based on the input information. For example, by inputting the type of the inflow valve, the path switching means is controlled to set the circulation path including the first path or the second path. In this way, the possibility of erroneous route switching is reduced, which is convenient for the operator.

Means 13. In the engine coolant circulation device according to any one of means 10 to 12,
The test engine coolant circulation apparatus, wherein the path switching means is realized by a three-way valve.

  As shown in the means 13, the path switching means described above can be realized by a three-way valve. At this time, for example, if an electrically controllable electric three-way valve is used, control by a computer or the like becomes possible.

Means 14. In the engine coolant circulation device according to any one of means 10 to 13,
The engine cooling water circulation apparatus for testing, wherein the pump means is provided in a return side path of cooling water from the outlet, which is different from the first path and the second path.

  According to the means 14, the pump means is provided in a common part not related to the return side path, that is, the first path and the second path. In this way, it is sufficient to provide only one pump means in the circulation path, and the configuration of the circulation device is simplified.

Means 15. In the engine coolant circulation device according to any one of means 10 to 14,
further,
A path not interposing the pump means;
A test engine coolant circulation apparatus, comprising: a pump path switching means for switching to the path and separating the pump means from the circulation path.

  According to the means 15, the circulation device further includes a path not including the pump means and a pump path switching means, and the pump path switching means can switch to the path. Therefore, since the pump inside the engine is operated after the engine is started, a test after the engine is started can be performed by using a path for cooling the engine by switching to a path not including the pump means.

Means 16. In the engine coolant circulation device according to any one of means 10 to 15,
further,
A bypass path for guiding cooling water from the middle of the first path to the return side path from the outlet;
An internal path switching means capable of switching between an internal circulation path which is a circulation path inside the circulation device including the bypass path and a normal circulation path including the engine;
And a heating means for heating the cooling water circulating through the internal circulation path.

  The test engine coolant circulation apparatus described in the means 16 further includes a bypass path, an internal path switching means, and a heating means.

  The bypass path leads the cooling water from the middle of the first path to the return side path from the outflow port. The internal path switching means can switch between an internal circulation path that is a circulation path inside the circulation device including the bypass path and a normal circulation path that includes the engine. The heating means heats the cooling water circulating in the internal circulation path.

  As described above, since the cooling water cooled by the cooling means can be supplied also from the first path, when the thermostat valve is used as the inflow valve, the following problems may occur.

  Since the thermostat valve is closed when the engine is started, the cooling water is circulated inside the engine after the engine is started. When the cooling water reaches a predetermined temperature such as 82 ° C., the thermostat valve is opened. At this time, if the cooling water having a relatively low temperature remains in the first path, the cooling water is transferred into the engine. The thermostat valve may return to the closed state. Therefore, there is a possibility that the temperature behavior of the cooling water is different from the temperature behavior in an actual vehicle, and there is a possibility that the temperature behavior is not appropriate.

  In contrast, according to the above-described configuration, the cooling water in the first path can be heated in advance by switching to the internal circulation path after the engine is cooled and before the engine is started. Therefore, it is possible to prevent the thermostat valve from returning to the closed state again due to the cooling water flowing into the engine when the thermostat valve is in the open state. As a result, an appropriate cooling water temperature behavior can be obtained.

Means 17. In the engine coolant circulation device according to means 16,
The engine cooling water circulation device for testing, wherein the internal path switching means is realized by a three-way valve.

  As shown in the means 17, the internal path switching means can be realized by a three-way valve. At this time, for example, if an electrically controllable electric three-way valve is used, control by a computer or the like becomes possible.

Means 18. In the engine coolant circulation device according to means 16 or 17,
Furthermore, the internal circulation path is provided with detection means capable of detecting that the cooling water has reached a predetermined temperature,
An engine cooling water circulation apparatus for testing, wherein the internal path switching means is controlled based on a detection result by the detection means.

  According to the means 18, the detection means detects that the cooling water has reached a predetermined temperature, and the internal path switching means is controlled based on the detection result. For example, it is controlled by the control means on the premise of the configuration including the control means. This is advantageous because the switching between the internal circulation path and the normal circulation path is automated.

Embodiments will be described below with reference to the drawings.
[First Embodiment]
FIG. 1 is an explanatory diagram showing a schematic configuration of a test engine coolant circulation system (hereinafter referred to as “the present system”) 1 according to the present embodiment.

  The system 1 includes an engine 10 and a circulation device 20. The circulation device 20 is controlled by a computer (not shown).

  The engine 10 includes an inflow portion 11, an inflow valve 12, a pump 13, a main body portion 14, an outflow portion 15, and a heater pipe 16.

  The inflow portion 11 is for allowing engine cooling water (hereinafter referred to as “cooling water”) to flow in. An inflow valve 12 is provided following the inflow portion 11, and a thermostat valve or an open state valve is used as the inflow valve 12. A thermostat valve is attached to a commercially available vehicle engine as described above. The thermostat valve is opened only when the temperature of the cooling water is equal to or higher than a predetermined temperature such as 82 ° C. It has become. On the other hand, the open state valve is used for an engine start test and is always open.

  The pump 13 is a pump for circulating the cooling water. When the engine is started, the cooling water is circulated by the action of the pump 13. Cooling water that flows in from the inflow portion 11 passes through a predetermined path inside the main body portion 14 and is discharged from the outflow portion 15 to the outside of the engine 10.

  In addition to the cooling water inlet from the inflow portion 11 described above, the engine 10 has an inlet through which the heater pipe 16 is interposed. The heater pipe 16 is a pipe that circulates cooling water that has been heated to a certain degree to the heat exchanger heater core for heating the passenger compartment, and generates hot air by blowing air to the heater core. Cooling water that has flowed in from the inlet through which the heater pipe 16 is interposed passes through a predetermined path inside the main body 14 and is discharged from the outflow portion 15 to the outside of the engine 10.

  The circulation device 20 includes a cooling device 21, a first path 22, a second path 23, a return side path 24, a pump 25, an electric three-way valve 26, and electric two-way valves 27 and 28.

  The first path 22 is a path between the electric three-way valve 26 and the inflow portion 11, and is for supplying cooling water to the engine 10 from an inlet port where the inflow valve 12 is interposed. On the other hand, the second path 23 is a path between the electric three-way valve 26 and the heater pipe 16, and is for supplying cooling water to the engine 10 from the inlet through which the heater pipe 16 is interposed. The return side path 24 is a path from the outflow portion 15 that is an outlet to the electric three-way valve 26. The return-side path 24 is branched into two branches on the way and merges again, and the pump 25 is provided on one path after the branch. And the electric two-way valves 27 and 28 are provided in this branch part. Here, since the electric two-way valve 28 is provided in the path on the pump 25 side, this is described as the pump-side electric two-way valve 28 and is appropriately distinguished from the other electric two-way valve 27. Further, a cooling device 21 is provided in the return side path 24 so that the circulating cooling water can be cooled.

  According to the system 1 configured as described above, the engine start test and the engine cooling prior to the engine start test can be performed. Then, next, the cooling water circulation at the time of engine cooling and the cooling water circulation at the time of an engine starting test are demonstrated.

  First, cooling water circulation during engine cooling will be described. At this time, the circulation path is switched depending on whether the inflow valve 12 is a thermostat valve or an open state valve.

  Specifically, switching is performed when an operator inputs information on the inflow valve 12 into a computer.

  When the inflow valve 12 is a thermostat valve, the electric three-way valve 26 is switched to the second path 23 side by a control signal from the computer. As a result, the cooling water is supplied from the second path 23 to the inflow port where the heater pipe 16 is interposed, and the cooling water circulates from the outflow portion 15 through the return side path 24.

  On the other hand, when the inflow valve 12 is an open state valve, the electric three-way valve 26 is switched to the first path 22 side by a control signal from the computer. As a result, the cooling water is supplied from the first path 22 through the inflow part 11, and the cooling water circulates from the outflow part 15 through the return side path 24.

  When the engine is cooled, the electric two-way valve 27 is closed and the pump-side electric two-way valve 28 is opened, and the cooling water is circulated by the action of the pump 25.

  Next, the cooling water circulation during the engine start test will be described. At this time, the electric three-way valve 26 is switched to the first path 22 side, the cooling water is supplied from the first path 22 via the inflow part 11, and the cooling water is passed from the outflow part 15 through the return side path 24. It will circulate.

  Since the pump 13 is activated by starting the engine 10, the electric two-way valve 27 is opened, the pump-side electric two-way valve 28 is closed, and the pump 25 is disconnected from the path. Further, when the inflow valve 12 is an open state valve, the cooling water is circulated through the first path 22 simultaneously with the engine start. On the other hand, when the inflow valve 12 is a thermostat valve, the cooling water circulates inside the main body 14 of the engine 10 until the cooling water reaches a predetermined temperature of 82 ° C. after the engine is started. Thereafter, when the thermostat valve is opened, the cooling water is circulated through the first path 22.

  Next, the effect which this system 1 exhibits is demonstrated.

  In the present system 1, each of the first path 22 and the second path 23 is configured to be able to supply the cooling water cooled by the cooling device 21, and the inflow port where the inflow valve 12 is interposed is set by switching the electric three-way valve 26. The cooling water can be selectively supplied to the inflow port 11 or the inlet through which the heater pipe 16 is interposed.

  Here, if the inflow valve 12 is a thermostat valve, it is in a closed state until the cooling water reaches a predetermined temperature. Therefore, the cooling water is supplied to the inlet through which the heater pipe 16 is interposed using the second path 23. On the other hand, if the inflow valve 12 is an open state valve, since it is always in an open state, the cooling water is supplied to the inflow part 11 using the first path 22.

  As a result, when an open state valve is used, cooling water is supplied from the first path 22 before the engine 10 is started, and therefore, high temperature cooling water remains in the first path 22 in repeated start-up tests. Therefore, when the engine is started, the high-temperature cooling water does not flow into the engine 10. As a result, an appropriate cooling water temperature behavior can be obtained even when the open state valve is used.

  Further, in the present system 1, the circulation device 20 includes a computer (not shown), and when the operator inputs information on the inflow valve 12, the electric three-way valve 26 is switched by a control signal from the computer. . This facilitates the control of the entire circulation device 20 and reduces the possibility of erroneous route switching by the electric three-way valve 26, which is convenient for the operator.

Furthermore, in the present system 1, since the pump 25 is provided in the return side path 24, it is sufficient to provide only one pump in the circulation device 20, and the configuration of the circulation device 20 is simplified. Since the pump 13 operates when the engine 10 is started, the electric two-way valves 27 and 28 are provided so that the pump 25 can be disconnected from the path. As a result, it is possible to perform a test after starting the engine by using a path for cooling the engine.
[Second Embodiment]
FIG. 2 is an explanatory diagram showing a schematic configuration of a test engine coolant circulation system (hereinafter referred to as “the present system”) 2 of the present embodiment.

  The system 2 includes an engine 10 and a circulation device 30. The circulation device 30 is controlled by a computer (not shown).

  In addition, this system 2 makes the structure of the circulation apparatus 30 different from the said embodiment. Therefore, only the configuration of the circulation device 30 different from the above embodiment will be described below. Components similar to those in the above embodiment are denoted by the same reference numerals as those in FIG.

  The circulating device 30 includes the cooling device 21, the first path 22, the second path 23, the return side path 24, the pump 25, the electric three-way valve 26, and the electric two-way valves 27 and 28. It is the same. In addition to these components, the circulation device 30 of the present system 2 further includes a bypass path 31, an electric three-way valve 32, an electric heater 33, and a temperature sensor 34.

  The bypass path 31 is a path for guiding cooling water from the middle of the first path 22 to the return side path 24. The electric three-way valve 32 is provided at a branch portion to the bypass path 31, and by switching to the bypass path 31 side, an internal circulation path inside the circulation device 30 without the engine 10 is set.

  In addition, the electric heater 33 and the temperature sensor 34 are provided in the internal circulation path, specifically, the return side path 24 before the electric three-way valve 26. The electric heater 33 is a heater for heating the cooling water, and the temperature sensor 34 detects that the cooling water has reached a predetermined temperature and sends a signal to a computer (not shown).

  Next, the operation of the circulation device 30 configured as described above will be described. This system 2 solves a problem in the case of using a thermostat valve as the inflow valve 12.

  As described above, when the inflow valve 12 is a thermostat valve, the electric three-way valve 26 is switched to the second path 23 side by a control signal from the computer. As a result, the cooling water is supplied from the second path 23 to the inflow port where the heater pipe 16 is interposed, and the cooling water circulates from the outflow portion 15 through the return side path 24. Then, after the engine 10 is cooled, the following cooling water is heated prior to the engine start test.

  That is, the electric three-way valve 32 is switched to the bypass path 31 side, and the cooling water circulates through the internal circulation path constituted by the first path 22, the bypass path 31 and the return side path 24. At this time, the electric heater 33 is turned on and the circulating cooling water is heated. As described above, the temperature sensor 34 detects that the cooling water has reached a predetermined temperature. Information on the sensor 34 is transmitted to a computer (not shown), and the computer transmits a control signal based on this information. To do. Thereby, when the cooling water reaches a predetermined temperature, the electric heater 33 is turned off, the electric two-way valve 27 is opened, the pump-side electric two-way valve 28 is closed, and the electric three-way valve 32 is moved to the engine 10 side. Can be switched to.

  Next, the effect which this system 2 exhibits is demonstrated.

  It goes without saying that the system 2 exhibits the same effect as the system 1 described above. And according to this system 2, in addition to the effect which the said system 1 exhibits, even the following malfunctions can be eliminated.

  Since the thermostat valve as the inflow valve 12 is in a closed state at the beginning of the engine 10, the cooling water is circulated inside the engine after the engine is started. The thermostat valve is opened when a predetermined temperature such as 82 ° C. is reached. At this time, if cooling water having a relatively low temperature remains in the first path, the cooling water flows into the engine. Therefore, the thermostat valve may return to the closed state again. Therefore, there is a possibility that the temperature behavior of the cooling water is different from the temperature behavior in an actual vehicle, and there is a possibility that the temperature behavior is not appropriate.

  On the other hand, according to the present system 2, the cooling water in the first path 22 can be heated in advance by switching to the internal circulation path after the engine is cooled and before the engine is started. Therefore, it is possible to prevent the thermostat valve from returning to the closed state again due to the cooling water flowing into the engine when the thermostat valve is in the open state. Therefore, an appropriate temperature behavior can be obtained.

The system 2 also includes a temperature sensor 34. The temperature sensor 34 detects that the cooling water has reached a predetermined temperature, and transmits information to a computer (not shown). As a result, the electric three-way valve 32 is switched to the engine 10 side by a control signal from the computer. As a result, switching between the internal circulation path and the normal circulation path is automated, which is advantageous.
[Others]
In addition, it is not limited to the description content of the said embodiment, For example, you may implement as follows.

  (A) In the first embodiment, the electric three-way valve 26 is switched by inputting information on the inflow valve 12 to the computer. In addition to this, a sensor for detecting the temperature of the engine 10 is provided so that the completion of the cooling of the engine 10 can be detected, and the electric three-way valve 26 and the electric two-way valves 27 and 28 are automatically provided in preparation for an engine start test. It is good also as the structure switched automatically.

  (B) In the said 2nd Embodiment, when the inflow valve 12 was a thermostat valve, it assumed that the cooling water was heated. On the other hand, the temperature sensor 34 may detect the temperature of the cooling water, and only when the temperature is equal to or lower than a predetermined temperature, the switching to the internal circulation path may be performed to turn on the electric heater 33.

It is explanatory drawing which shows schematic structure of the engine cooling water circulation system of 1st Embodiment. It is explanatory drawing which shows schematic structure of the engine cooling water circulation system of 2nd Embodiment. It is explanatory drawing which shows schematic structure of the conventional engine cooling water circulation system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1, ... Engine cooling water circulation system, 10 ... Engine, 11 ... Inflow part, 12 ... Inflow valve, 13 ... Pump, 14 ... Main part, 15 ... Outflow part, 16 ... Heater pipe, 20, 30 ... Test engine cooling Circulating device as water circulating device, 21 ... cooling device as cooling means, 22 ... first path, 23 ... second path, 24 ... return side path, 25 ... pump as pump means, 26 ... electric drive as path switching means Three-way valve 27, 28 ... Electric two-way valve as pump path switching means, 31 ... Bypass path, 32 ... Electric three-way valve as internal path switching means, 33 ... Electric heater as heating means, 34 ... Detection means Temperature sensor.

Claims (9)

A test equipped with an engine having an inlet and an outlet for cooling water that enables circulation of the cooling water, and a circulation device that circulates and supplies the cooling water to the engine for testing by installing the engine on a test bench Engine cooling water circulation system for
The engine has, as the inlet, a first inlet through which an inflow valve is interposed and a second inlet through which a heater pipe is interposed,
The circulation device is
Pump means for circulating cooling water;
Cooling means for cooling the cooling water;
A first path for supplying cooling water cooled by the cooling means to the first inlet;
A second path for supplying cooling water cooled by the cooling means to the second inlet,
A test engine cooling water circulation system comprising: a path switching unit capable of switching and setting a path including either the first path or the second path as a cooling water circulation path. The engine coolant circulation system according to claim 1,
The circulating system for testing is further provided with a control means for controlling the entire apparatus. The engine coolant circulation system according to claim 2,
The engine cooling water circulation system for testing, wherein the control means is configured to control the path switching means based on inputted information. The engine coolant circulation system according to any one of claims 1 to 3,
The test engine coolant circulation system, wherein the path switching means is realized by a three-way valve. The engine coolant circulation system according to any one of claims 1 to 4,
The engine cooling water circulation system for testing, wherein the pump means is provided in a cooling water return side path different from the first path and the second path. The engine coolant circulation system according to any one of claims 1 to 5,
The circulation device further includes:
A path not interposing the pump means;
A test engine coolant circulation system, comprising: a pump path switching means for switching to the path and disconnecting the pump means from the circulation path. The engine coolant circulation system according to any one of claims 1 to 6,
The circulation device further includes:
A bypass path for guiding cooling water from the middle of the first path to the return side path from the outlet;
An internal path switching means capable of switching between an internal circulation path which is a circulation path inside the circulation device including the bypass path and a normal circulation path including the engine;
And a heating means for heating the cooling water circulating through the internal circulation path. The engine coolant circulation system according to claim 7,
The engine cooling water circulation system for testing, wherein the internal path switching means is realized by a three-way valve. The engine coolant circulation system according to claim 7 or 8,
The circulation device further includes a detection unit capable of detecting that the cooling water has reached a predetermined temperature in the internal circulation path,
A test engine coolant circulation system, wherein the internal path switching means is controlled based on a detection result by the detection means.

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