JP5307529B2 - Fluid temperature adjusting method and fluid temperature adjusting device for driving system performance test of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and a device for controlling fluid temperature for performing precise adjustment of the fluid temperature by rapidly adjusting to prescribed temperature to an abrupt temperature change of fluid circulating in the drive system of an internal combustion engine and holding the fluid at fixed temperature. <P>SOLUTION: The device includes: a fluid channel 22 having an introduction passage 11 for introducing fluid from the drive system 6 having the internal combustion engine, a circulation passage 12 where fluid introduced from the introduction passage 11 is circulated, and an outlet passage 13 for leading fluid circulating through the circulation passage 12 to the drive system 6; a heat exchanger 16 for decreasing temperature of fluid introduced from the drive system 6; a first heater 17 for adjusting the temperature of fluid circulated in the circulation passage 12 to temperature near control temperature; and a second heater 19 for adjusting the temperature of fluid temperature-adjusted by the first heater 17 in the outlet passage 13 so that the temperature of fluid in the drive system 6 reaches control temperature. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a fluid temperature adjustment method and a fluid temperature adjustment device in a drive system performance test such as measurement of drive resistance of an internal combustion engine, and in particular, engine oil, engine cooling water, or mission oil in a test device such as an engine test bench. The present invention relates to a fluid temperature control apparatus and method for controlling temperature.

  For example, a performance test of an automobile engine includes a test for confirming engine quality such as a motoring test and a firing test. During the performance test of this automobile engine, if the fluid temperature of engine oil, engine coolant, or mission oil flowing through the engine and the transmission connected to the engine is variable, it will be difficult to check the exact engine performance. In addition, a fluid temperature control device capable of keeping each fluid temperature constant at a desired temperature is provided in a test device such as an engine test bench.

  FIG. 7 shows a fluid temperature control device for controlling engine oil provided in a conventional engine test bench. As shown in FIG. 7, the drive system 6 including the engine 1 that is a device under test includes an axial torque meter 2 that is provided on the shaft 5 that transmits the driving force of the engine 1 and that measures the torque of the shaft 5, and The transmission 3 is configured to vary the rotation speed and torque, and the dynamo 4 is configured to generate electric power by rotating the shaft 5.

  The engine oil temperature control device 110 includes an introduction port 112 that is a port for introducing engine oil that circulates through each part in the engine 1, an oil passage 111 through which engine oil introduced from the introduction port 112 flows, and an oil passage 111, a pump 113 for pumping engine oil in the oil passage 111, a cooler 114 for cooling the engine oil in the oil passage 111, and an oil flow provided in the oil passage 111. The heater 115 for heating the engine oil in the passage 111 and the return port 116 which is a port for returning the engine oil flowing through the oil passage 111 to the engine.

  The engine oil temperature control device 110 is provided with a control unit 120 that controls the temperature (oil temperature) of the engine oil. The control unit 120 includes a temperature sensor 123 that detects the oil temperature in the engine, a temperature sensor 124 that detects the oil temperature before the inlet of the cooler 114 in the oil passage 111, and an outlet between the cooler 114 and the heater 115. In order to receive a detection signal from the temperature sensor 125 that detects the oil temperature and the temperature sensor 126 that detects the oil temperature at the outlet of the heater 115 in the oil flow path 111, the cooler 114 and the heater are brought close to the preset oil temperature. 115, and a converter 122 that transmits an output signal to the cooler 114 and the heater 115 in accordance with the output value determined by the temperature controller 121. In addition, the engine oil temperature control device 110 is provided with an operation panel 130 for setting a desired oil temperature in the engine by the user. The operation panel 130 has a display device that displays the oil temperature and the set oil temperature detected by the temperature sensors 123, 124, 125, and 126.

  The control unit 120 calculates the temperature difference between the oil temperature in the engine 1 and the outlet of the heater 115, and determines the oil temperature at the outlet of the heater 115 necessary to approach the set oil temperature. Next, the oil temperature before the cooler 114 inlet and the oil temperature before the heater 115 inlet are determined based on the determined oil temperature at the outlet of the heater 115. The output values of the cooler 114 and the heater 115 are determined according to the determined oil temperatures. The output values of the cooler 114 and the heater 115 are transmitted to the cooler 114 and the heater 115 as output signals by the converter 122. As a result, the cooler 114 and the heater 115 adjust their outputs according to the output signal, and cool and warm the engine oil. Further, the control unit 120 measures the oil temperature of the cooled and warmed engine oil by the temperature sensors 123, 124, 125, 126, and sets the oil temperature at each position again to adjust the oil temperature. It is carried out. Thereby, the desired oil temperature of the engine oil in the engine 1 is kept constant.

Further, in addition to the engine oil temperature control device of FIG. 7 described above, the control unit is based on the difference between the oil temperature at the outlet of the heat exchanger and the oil temperature in the oil hole in the engine, and the operating state of the engine. A technique for performing control using fuzzy inference has been proposed (Patent Document 1).
JP-A-6-117212

  However, during engine test operation, the temperature of engine oil in the engine may suddenly rise, and conventional engine oil temperature control devices regulate the temperature with a cooler or heater to suppress fluctuations in the oil temperature. There is a problem that it takes time to return to a predetermined oil temperature and affects the test result of the engine.

  Therefore, the present invention has been made in view of the above circumstances, and quickly adjusts the fluid to a predetermined temperature in response to a rapid temperature change of the fluid circulating in the drive system of the internal combustion engine, and maintains the fluid at a constant temperature. It is an object of the present invention to provide a fluid temperature control method and apparatus that can hold the fluid temperature with high accuracy and adjust the temperature of the fluid.

In order to solve the above problems, a fluid temperature adjustment method in a drive system performance test of an internal combustion engine according to the present invention includes an introduction path for introducing fluid from a drive system equipped with the internal combustion engine, and a serial connection to the introduction path. A fluid path having a circulation path through which the fluid introduced from the introduction path circulates and a lead-out path for deriving the fluid circulating through the circulation path to the drive system; and provided in the fluid path. A cooling means for lowering the temperature of the fluid introduced from the drive system, and the fluid cooled by the cooling means based on conditions necessary for performing a performance test of the drive system. A method for adjusting a fluid temperature in a drive system performance test of an internal combustion engine, wherein the fluid is adjusted to a set control temperature and the fluid is led out again to the drive system through the lead-out path,
A first temperature sensor that detects the temperature of the fluid in the buffer tank that temporarily stores the fluid in the circulation path is provided in the buffer tank, and is circulated in the circulation path by a detection signal of the first temperature sensor. A first temperature adjusting step for adjusting the temperature of the fluid being adjusted to a temperature in the vicinity of the control temperature;
A second temperature sensor for detecting the temperature of the fluid in the drive system is provided in the drive system, and the temperature is detected in the first temperature adjustment step in the lead-out path by a detection signal of the second temperature sensor. And a second temperature adjustment step of adjusting the adjusted temperature of the fluid to a temperature at which the temperature of the fluid in the drive system becomes the control temperature.

  According to the above-described configuration, in the drive system performance test of the internal combustion engine, a fluid having a large temperature fluctuation due to the load of the internal combustion engine is constant in an environment that is not affected by the load of the internal combustion engine in the first temperature adjustment step. By adjusting to the temperature, fluctuations in the temperature of the fluid can be suppressed. In the second temperature adjustment step, since the temperature has already been adjusted to a constant temperature by the first temperature adjustment step, the temperature of the necessary fluid can be quickly adjusted. Therefore, even if the load fluctuation of the internal combustion engine is large, the temperature of the fluid in the internal combustion engine can be immediately returned to the temperature that becomes the control temperature, the fluctuation of the temperature of the fluid in the internal combustion engine can be reduced, In addition, the control accuracy of the fluid temperature adjustment can be increased.

The fluid temperature adjustment method in the drive system performance test of the internal combustion engine of the present invention includes an introduction step of introducing fluid from the drive system including the internal combustion engine into the circulation path via the introduction path;
A cooling step for lowering the temperature of the fluid introduced into the circulation path;
A first temperature sensor that detects the temperature of the fluid in the buffer tank that temporarily stores the fluid in the circulation path is provided in the buffer tank, and is circulated in the circulation path by a detection signal of the first temperature sensor. A first temperature adjustment step of adjusting the temperature of the fluid being adjusted to a temperature in the vicinity of a control temperature set based on conditions necessary for performing a performance test of the drive system;
A second temperature sensor for detecting the temperature of the fluid in the drive system is provided in the drive system, and a lead-out path for leading the fluid circulating in the circulation path to the drive system by a detection signal of the second temperature sensor A second temperature adjusting step for adjusting the temperature of the fluid whose temperature is adjusted in the first temperature adjusting step to a temperature at which the temperature of the fluid in the drive system becomes the control temperature;
It is characterized by having.

  Further, in addition to the above-described invention, the method further includes a heat retaining step for retaining the fluid whose temperature has been adjusted in the first temperature adjusting step at a constant temperature.

  Further, according to the above-described configuration, the fluid circulating in the circulation path is kept constant at a desired temperature by providing a heat retaining step for retaining the fluid whose temperature has been adjusted in the first temperature adjusting step at a constant temperature. Therefore, the second temperature adjustment step makes it possible to easily adjust the temperature of the fluid in the lead-out path so that the temperature of the fluid in the drive system becomes the control temperature. it can.

  Moreover, in addition to the above-mentioned invention, it is further characterized by further having a storage step of temporarily storing the fluid circulating in the circulation path.

  Further, according to the above-described configuration, by providing the storage step of temporarily storing the fluid at a constant temperature in an environment that is not affected by the load of the internal combustion engine in the first temperature adjustment step through the circulation path. Even if the temperature fluctuation range is large due to the load fluctuation of the internal combustion engine, it is possible to follow the fluctuation range of the load of the internal combustion engine over a wide range depending on the amount of fluid stored in the storage means. Temperature can be adjusted.

A fluid temperature adjustment method in a drive system performance test of an internal combustion engine according to the present invention includes an introduction path for introducing fluid from a drive system equipped with an internal combustion engine, and a circulation path connected in series to the introduction path, the introduction path A fluid path having a circulation path through which the fluid introduced from the circuit circulates, a lead-out path for leading the fluid circulating through the circulation path to the drive system, and a cooling means provided in the fluid path, A cooling means for lowering the temperature of the fluid introduced from the drive system, and the fluid cooled by the cooling means is adjusted to a control temperature set based on conditions required for performing a performance test of the drive system. Again, a fluid temperature adjustment method in a drive system performance test of an internal combustion engine in which the fluid is led to the drive system through the lead-out path,
A first temperature sensor that detects the temperature of the fluid in the buffer tank that temporarily stores the fluid in the circulation path is provided in the buffer tank, and is circulated in the circulation path by a detection signal of the first temperature sensor. A first temperature adjusting step for adjusting the temperature of the fluid being adjusted to a temperature in the vicinity of the control temperature;
A heat retaining step for retaining the fluid whose temperature has been adjusted in the first temperature adjusting step at a constant temperature;
A storage step for temporarily storing fluid circulating in the circulation path;
A second temperature sensor for detecting the temperature of the fluid in the drive system is provided in the drive system, and the temperature is detected in the first temperature adjustment step in the lead-out path by a detection signal of the second temperature sensor. A second temperature adjustment step of adjusting the adjusted temperature of the fluid to a temperature at which the temperature of the fluid in the drive system becomes the control temperature;
It is characterized by having.

  In addition to the above-described invention, the temperature of the fluid circulated in the circulation path is controlled to be adjusted to the vicinity of the control temperature, and the temperature of the fluid derived in the derivation path is adjusted in the drive system. It further has a control step of controlling the temperature of the fluid to be adjusted to a temperature that is the control temperature.

  In addition to the above-described invention, a first detection step for detecting the temperature of the fluid circulated in the circulation path, and a second detection step for detecting the temperature of the fluid in the drive system. Further, the control step includes, based on the temperature of the fluid circulating in the circulation path detected in the first detection step, the temperature of the fluid circulating in the circulation path of the control temperature. Based on the temperature of the fluid in the drive system detected in the second detection step, the temperature of the fluid to be led out in the lead-out path is set to the temperature of the fluid in the drive system. Control is performed so as to adjust the temperature to a control temperature.

  In addition to the above-described invention, the first temperature adjusting step adjusts the fluid circulating in the circulation path to a first temperature lower than the control temperature by a predetermined range, and the heat retaining step includes the first temperature adjusting step. The fluid adjusted in the temperature adjusting step is kept at the first temperature, and the second temperature adjusting step is performed in the temperature maintaining step in the lead-out path for leading the fluid circulating in the circulation path to the drive system. The temperature of the retained fluid is adjusted to a second temperature that is higher than the control temperature by a predetermined range.

  In addition to the above-described invention, in the first temperature adjustment step, the fluid circulating in the circulation path is adjusted to a third temperature that is a predetermined range higher than the control temperature, and the heat retention step includes the first temperature adjustment step. The fluid adjusted in the temperature adjustment step is kept at the third temperature, and the second temperature adjustment step is performed in the temperature maintaining step in the lead-out path for leading the fluid circulating in the circulation path to the drive system. The temperature of the retained fluid is adjusted to a fourth temperature higher than the control temperature by a predetermined range and lower than the third temperature.

  In addition to the above-described invention, the fluid is any one of engine oil, mission oil, and engine cooling water.

In order to solve the above-mentioned problem, a fluid temperature adjusting device in a drive system performance test of an internal combustion engine according to the present invention is connected in series to an introduction path for introducing fluid from a drive system equipped with the internal combustion engine, A fluid path having a circulation path through which the fluid introduced from the introduction path circulates, and a lead-out path for leading the fluid circulating through the circulation path to the drive system, and the fluid path A cooling means provided for reducing the temperature of the fluid introduced from the drive system, and the fluid cooled by the cooling means under conditions necessary for performing a performance test of the drive system. A fluid temperature adjusting device in a drive system performance test of an internal combustion engine that adjusts to a control temperature set on the basis of the fluid and leads the fluid to the drive system again through the lead-out path,
A first temperature sensor that detects the temperature of the fluid in the buffer tank that temporarily stores the fluid in the circulation path is provided in the buffer tank, and is circulated in the circulation path by a detection signal of the first temperature sensor. First temperature adjusting means for adjusting the temperature of the fluid being adjusted to a temperature in the vicinity of the control temperature;
A second temperature sensor for detecting the temperature of the fluid in the drive system is provided in the drive system, and the temperature is detected by the first temperature adjusting means in the lead-out path based on a detection signal of the second temperature sensor. Second temperature adjusting means for adjusting the temperature of the adjusted fluid to a temperature at which the temperature of the fluid in the drive system becomes the control temperature;
It is characterized by having.

  According to the above configuration, in the drive system performance test of the internal combustion engine, the fluid having a large temperature fluctuation due to the load of the internal combustion engine is influenced by the load of the internal combustion engine by the first temperature adjusting means provided in the circulation path. By adjusting the temperature to be constant in an environment free from fluid, fluctuations in the temperature of the fluid can be suppressed. Further, since the second temperature adjusting means has already been adjusted to a constant temperature by the first temperature adjusting means, it can be quickly adjusted to the required fluid temperature. Therefore, even if the load fluctuation of the internal combustion engine is large, the temperature of the fluid in the internal combustion engine can be immediately returned to the temperature that becomes the control temperature, the fluctuation of the temperature of the fluid in the internal combustion engine can be reduced, In addition, the control accuracy of the fluid temperature adjustment can be increased.

  The fluid temperature adjusting device in the drive system performance test of the internal combustion engine of the present invention includes an introduction path for introducing fluid from a drive system equipped with the internal combustion engine, and a circulation path connected in series to the introduction path. A fluid path having a circulation path through which the fluid introduced from the introduction path circulates, a lead-out path for deriving the fluid circulating through the circulation path to the drive system, and a temperature of the fluid introduced into the circulation path is reduced. A first temperature for adjusting the temperature of the cooling means and the temperature of the fluid circulated in the circulation path to a temperature in the vicinity of the control temperature set based on the conditions required for performing the performance test of the drive system In the adjustment means and the lead-out path for leading the fluid circulating in the circulation path to the drive system, the temperature of the fluid adjusted in temperature by the first temperature adjustment means is the temperature of the fluid in the drive system. The temperature is adjusted to the control temperature. A second temperature adjusting means, characterized by having a.

  Further, in addition to the above-mentioned invention, it further comprises a heat retaining means provided in the circulation path, which retains the fluid whose temperature has been adjusted by the first temperature adjusting means at a constant temperature. Features.

  Moreover, in addition to the above-mentioned invention, it is a storage means provided in the said circulation path, Comprising: It further has the storage means which temporarily stores the fluid which circulates in the said circulation path, It is characterized by the above-mentioned.

The fluid temperature adjusting device in the drive system performance test of the internal combustion engine of the present invention includes an introduction path for introducing fluid from a drive system equipped with the internal combustion engine, and a circulation path connected in series to the introduction path. A fluid path having a circulation path through which the fluid introduced from the introduction path circulates, a lead-out path for deriving the fluid circulating through the circulation path to the drive system, and a cooling means provided in the fluid path. A cooling means for lowering the temperature of the fluid introduced from the drive system, and a control temperature set based on conditions required for performing the performance test of the drive system on the fluid cooled by the cooling means. A fluid temperature adjusting device in a drive system performance test of an internal combustion engine that adjusts and leads the fluid to the drive system again through the lead-out path,
A first temperature sensor that detects the temperature of the fluid in the buffer tank that temporarily stores the fluid in the circulation path is provided in the buffer tank, and is circulated in the circulation path by a detection signal of the first temperature sensor. First temperature adjusting means for adjusting the temperature of the fluid being adjusted to a temperature in the vicinity of the control temperature;
Heat retaining means for retaining the fluid whose temperature has been adjusted by the first temperature adjusting means at a constant temperature;
A storage means for temporarily storing a fluid circulating in the circulation path;
A second temperature sensor for detecting the temperature of the fluid in the drive system is provided in the drive system, and the temperature is detected by the first temperature adjusting means in the lead-out path based on a detection signal of the second temperature sensor. Second temperature adjusting means for adjusting the temperature of the adjusted fluid to a temperature at which the temperature of the fluid in the drive system becomes the control temperature;
Have

  In addition to the above-described invention, the temperature of the fluid circulated in the circulation path is controlled to be adjusted to the vicinity of the control temperature, and the temperature of the fluid derived in the derivation path is adjusted in the drive system. It further has control means for controlling so that the temperature of the fluid is adjusted to a temperature that is the control temperature.

  Further, in addition to the above-described invention, the first detection means provided in the circulation path, the first detection means for detecting the temperature of the fluid circulating in the circulation path, and the drive A second detection means provided in the system, the second detection means for detecting the temperature of the fluid in the drive system, and the control means is the first detection means. Based on the detected temperature of the fluid circulating in the circulation path, the temperature of the fluid circulating in the circulation path is controlled to be adjusted to the vicinity of the control temperature, and detected by the second detection means. Based on the temperature of the fluid in the drive system, the temperature of the fluid led out in the lead-out path is controlled to be adjusted to a temperature at which the temperature of the fluid in the drive system becomes the control temperature. .

  Further, in addition to the above-described invention, the storage means is configured such that the storage amount of the temporarily stored fluid is larger by a predetermined range than the fluid amount including the fluid amount in the drive system and the fluid amount in the fluid path. It is characterized by.

  In addition to the above-described invention, the first temperature adjusting unit adjusts the fluid circulating in the circulation path to a first temperature lower than the control temperature by a predetermined range, and the heat retaining unit includes the first temperature adjusting unit. The fluid adjusted by the temperature adjusting means is kept at the first temperature, and the second temperature adjusting means is provided in the lead-out path for leading the fluid circulating in the circulation path to the drive system. The temperature of the retained fluid is adjusted to a second temperature that is higher than the control temperature by a predetermined range.

  In addition to the above-mentioned invention, the first temperature adjusting means adjusts the fluid circulating in the circulation path to a third temperature higher than the control temperature by a predetermined range, and the heat retaining means The fluid adjusted by the temperature adjusting means is kept at the third temperature, and the second temperature adjusting means is provided in the outlet path for leading the fluid circulating in the circulation path to the drive system. The temperature of the retained fluid is adjusted to a fourth temperature higher than the control temperature by a predetermined range and lower than the third temperature.

  In addition to the above-described invention, the first temperature adjusting means is provided on the downstream side of the cooling means, and the storage means is provided on the downstream side of the first temperature adjusting means. Features.

  In addition to the above-described invention, the fluid is any one of engine oil, mission oil, and engine cooling water.

  According to the present invention, the temperature of the fluid can be adjusted with high accuracy by quickly adjusting the temperature to a predetermined temperature in response to a sudden temperature change of the fluid circulating in the drive system of the internal combustion engine and maintaining the fluid at a constant temperature. A fluid temperature control method and apparatus can be provided.

Hereinafter, the best two embodiments of the present invention will be described with reference to the accompanying drawings. 1 to 5, Embodiment 1 of the present invention will be described by taking a fluid temperature control method and apparatus for controlling the temperature of engine oil in an engine test bench as an example.
(Embodiment 1)

  FIG. 1 is a configuration diagram showing a fluid temperature control device for controlling engine oil provided in an engine test bench according to Embodiment 1 of the present invention.

  As shown in FIG. 1, a drive system 6 including an engine 1 that is a device under test includes an axial torque meter 2 that is provided on a shaft 5 that transmits the driving force of the engine 1, and that measures the torque of the shaft 5. The transmission 3 is configured to vary the rotation speed and torque, and the dynamo 4 is configured to generate electric power by rotating the shaft 5.

  The fluid temperature control device 7 includes an introduction path 11 for deriving engine oil from the engine 1, a circulation path 12 provided in series with the introduction path 11 for circulating the engine oil derived from the introduction path 11, A fluid path 22 having an outlet path 13 for returning engine oil to the engine 1 is provided.

  The introduction path 11 includes an introduction port 14 that is an inlet for inputting engine oil derived from the engine 1. The circulation path 12 includes a pump 15 that pumps and circulates engine oil in the circulation path 12, a heat exchanger 16 that regulates the engine oil circulating in the circulation path 12 to a first temperature (s1), and A first heater 17 and a buffer tank 18 for temporarily storing engine oil circulating in the circulation path 12 are provided. In addition, the lead-out path 13 flows through the lead-out path 13 and a second heater 19 that adjusts the temperature of the engine oil so as to become the control temperature when returning from the circulation path 12 to the engine 1 via the lead-out path 13. And a return port 20 that is an outlet for returning the engine oil to the engine 1.

  In the circulation path 12, the heat exchanger 16 is provided on the connection portion side with the introduction path 11. The first heater 17 is provided on the downstream side of the heat exchanger 16, and the buffer tank 18 is provided on the downstream side of the first heater 17. The circulation path 12 has a circulation path 21 for returning engine oil that circulates in the circulation path from the connection portion side with the lead-out passage 13 provided on the downstream side of the buffer tank 18 to the connection portion side with the introduction path 11. ing.

  The amount of engine oil stored in the buffer tank 18 provided in the circulation path 12 can be stored more than the amount of fluid including the amount of engine oil circulating in the engine 1 and the amount of engine oil in the fluid path 22. That is, a sufficient amount of engine oil is stored in the buffer tank 18 compared to the amount of engine oil circulating in the engine 1.

  The first heater 17 raises the temperature of the engine oil in the circulation path 12. The heat exchanger 16 cools the engine oil with cooling water that exchanges heat with the engine oil in the circulation path 12. In the fluid temperature control device 7, a cooling water inlet 93 through which cooling water is introduced, a cooling introduction pipe 91 through which low-temperature cooling water from the cooling water inlet 93 flows, and heat exchange by the heat exchanger 16 cause high temperature. A cooling return pipe 92 through which the cooling water thus formed is provided, and a return opening 94 that is discharged from the cooling return pipe 92 to the outside of the fluid temperature control device 7 are provided. The cooling introduction pipe 91 has a flow rate control valve 47 for controlling the flow rate of the cooling water to the heat exchanger 16. That is, the efficiency of cooling the engine oil in the heat exchanger 16 is adjusted by the flow control valve 47. The second heater 19 raises the temperature of the engine oil in the outlet path 13.

  Further, the fluid temperature control device 7 is provided with a control unit 30 that controls the heat exchanger 16 that controls the temperature of the engine oil, the first heater 17, and the second heater 19. The control unit 30 includes a first temperature sensor 41 that detects the temperature of the engine oil of the engine 1, a second temperature sensor 42 that detects the temperature of the engine oil in the buffer tank 18, and the circulation detected by the second temperature sensor 42. Based on the temperature of the engine oil flowing through the passage 12, a first temperature controller 31 that adjusts the temperature of the engine oil circulating in the circulation passage 12 to the first temperature (s 1), and a first temperature sensor 41 A second temperature controller 32 for controlling the temperature of the engine oil flowing through the outlet passage 13 to the second temperature (s2) by controlling the second heater 19 based on the detected temperature of the engine oil of the engine 1; An X characteristic converter 33 that generates a control signal for controlling the flow control valve 47 and the first heater 17 of the heat exchanger 16 is provided.

  The first temperature controller 31 receives a detection signal from the second temperature sensor 42 that detects the temperature of the engine oil in the buffer tank 18, and based on this detection signal, the engine oil temperature in the buffer tank 18 changes to the first temperature. The control signal is transmitted to the X characteristic converter so that the temperature (s1) is reached. The X characteristic converter 33 converts the cooling signal and the heating signal based on the control signal from the first temperature controller 31. The cooling signal output from the X characteristic converter 33 is input to the flow control valve 47 of the heat exchanger 16 and the heating signal is input to the first heater 17 to control the respective outputs. The engine oil adjusted by the heat exchanger 16 and the first heater 17 is detected again by the second temperature sensor 42 in the buffer tank 18 and the temperature of the engine oil in the buffer tank 18 is adjusted by feedback control. It can be held at the first temperature (s1).

  As a result, the engine oil in the buffer tank 18 can be kept at the first temperature (s1) while the engine oil whose temperature has been adjusted by the heat exchanger 16 and the first heater 17 can be maintained. Furthermore, by providing a heat insulating material on the outer periphery of the buffer tank 18, the engine oil temperature fluctuation in the buffer tank 18 can be reduced.

  The second temperature controller 32 receives a detection signal from the first temperature sensor 41 that detects the temperature of the engine oil in the engine 1, and based on this detection signal, the engine oil temperature in the engine 1 is controlled to the control temperature. Then, a heating signal for setting the engine oil temperature of the outlet path 13 to the second temperature (s2) is transmitted to the second heater 19. The engine oil whose temperature has been adjusted to the second temperature (s2) by the second heater 19 by the control of the second temperature controller 32 is led out into the engine 1, and the temperature of the engine oil becomes the control temperature (s0). Become. Moreover, the temperature of the engine oil in the engine 1 can be held at the control temperature (s0) by detecting the temperature of the engine oil again with the first temperature sensor 41 in the engine 1 and performing feedback control.

  In addition, the fluid temperature control device 7 is provided with an operation panel 100 that performs input and output with respect to the control unit 30. The operation panel 100 inputs and sets the set temperature (control temperature: s0) of the engine oil temperature in the engine 1 and the set temperature (first temperature: s1) of the engine oil temperature in the buffer tank 18 by the user. Temperature information of engine oil detected by a setting unit (not shown), the first temperature sensor 41 and the second temperature sensor 42, control information of the first temperature controller 31 and the second temperature controller 32, and flow rate control A display unit (not shown) for displaying output information of the valve 47, the first heater 17, and the second heater 19 is provided. The user can check the temperature state of the engine oil and the state of the fluid temperature control device 7 based on the information displayed on the display unit.

  In the setting unit of the operation panel 100, the user first inputs a desired temperature (control temperature: s0) of the engine oil temperature in the engine 1. Next, the engine oil temperature in the buffer tank 18 is set by inputting a temperature difference with respect to the previously set control temperature (s0). For example, when the control temperature (s0) of the engine oil temperature in the engine 1 is set to 90 ° C., the engine oil temperature in the buffer tank 18 is set to −2 ° C. from the control temperature (s0) of the engine oil temperature in the engine 1. Can be set to 88 ° C. (first temperature: s1). The input range of the above-described temperature difference for setting the first temperature (s1) of the engine oil temperature in the buffer tank 18 is provided with a predetermined range (for example, ± 5 ° C.). Then, the temperature difference within the predetermined range is input to set the first temperature (s1) of the engine oil temperature in the buffer tank 18.

  The engine oil temperature control method in the control unit 30 will be described with reference to FIGS.

  FIG. 2 is a flowchart showing engine oil temperature control processing executed by the control unit of the engine oil temperature control apparatus according to the first embodiment of the present invention. In step S <b> 10, the user inputs the control temperature (s <b> 0) of the engine oil in the engine 1 on the operation panel 100. The input value is sent to the second temperature controller 32 of the control unit 30 and set as the control temperature (s0) of the engine oil in the engine 1. When this process is completed, the process proceeds to step S20.

  In step S20, the user sets the first temperature (s1) of the engine oil in the circulation path 12 on the operation panel 100 by inputting an increase / decrease value with respect to the control temperature (s0) set in step S10. . When this process is completed, the process proceeds to step S30.

  In step S30, in the first temperature controller 31 of the control unit 30, the temperature (t1) of the engine oil in the buffer tank 18 is detected by the second temperature sensor 42 in the buffer tank 18. When this process is completed, the process proceeds to step S40.

  In step S40, the first temperature controller 31 of the control unit 30 determines that the engine oil temperature (t1) detected by the second temperature sensor 42 in the buffer tank 18 is the first temperature (s1) set in step S20. It is determined whether it is higher (t1> s1). If it is determined that t1> s1, the process proceeds to step S50. If it is not determined that t1> s1, the process proceeds to step S60.

  In step S50, the first temperature controller 31 of the control unit 30 takes the difference between the engine oil temperature (t1) in the buffer tank 18 and the first temperature (s1), and calculates the absolute value of the difference (| t1-s1). A temperature control signal corresponding to |) is sent to the X characteristic converter 33. The X characteristic converter 33 converts it into a cooling signal for increasing the opening degree of the flow control valve 47 of the heat exchanger 16 according to the temperature control signal and a heating signal for suppressing the output of the first heater 17. The respective signals are transmitted to the flow control valve 47 and the first heater 17. When this process is completed, the process proceeds to step S60.

  In step S60, the flow control valve 47 increases the opening according to the received cooling signal to increase the cooling capacity of the heat exchanger 16. Moreover, the 1st heater 17 reduces an output according to the received heating signal. When this process is completed, the process proceeds to step S30.

  In step S70, the first temperature controller 31 of the control unit 30 determines that the engine oil temperature (t1) detected by the second temperature sensor 42 in the buffer tank 18 is the first temperature (s1) set in step S20. It is determined whether it is lower (t1 <s1). If it is determined that t1 <s1, the process proceeds to step S80. If it is not determined that t1 <s1 (t1 = s1), the process proceeds to step S100.

  In step S80, the first temperature controller 31 of the controller 30 takes the difference between the temperature (t1) of the engine oil in the buffer tank 18 and the first temperature (s1), and calculates the absolute value of the difference (| t1-s1). A temperature control signal corresponding to |) is sent to the X characteristic converter 33. The X characteristic converter 33 converts the cooling signal for decreasing the opening degree of the flow control valve 47 of the heat exchanger 16 according to the temperature control signal and the heating signal for increasing the output of the first heater 17 into The respective signals are transmitted to the flow control valve 47 and the first heater 17. When this process is completed, the process proceeds to step S90.

  In step S90, the flow rate control valve 47 decreases the opening degree according to the received cooling signal, and lowers the cooling capacity of the heat exchanger 16. Moreover, the 1st heater 17 raises an output according to the received heating signal. When this process is completed, the process proceeds to step S30.

  In step S100, the second temperature controller 32 of the control unit 30 detects the temperature (t0) of the engine oil in the engine 1 by the first temperature sensor 41 in the engine 1. When this process is completed, the process proceeds to step S110.

  In Step S110, the second temperature controller 32 of the control unit 30 has the engine oil temperature (t0) detected by the first temperature sensor 41 in the engine 1 higher than the control temperature (s0) set in Step S10 ( It is determined whether or not t0> s0). If it is determined that t0> s0, the process proceeds to step S120. If it is not determined that t0> s0, the process proceeds to step S130.

  In step S120, the second temperature controller 32 of the control unit 30 takes the difference between the temperature (t0) of the engine oil in the engine 1 and the control temperature (s0), and calculates the absolute value of the difference (| t0−s0 |). A heating signal that suppresses the output of the second heater 19 corresponding to is generated and transmitted to the second heater 19. When this process is completed, the process proceeds to step S160.

  In step S130, the second temperature controller 32 of the controller 30 has the engine oil temperature (t0) detected by the first temperature sensor 41 in the engine 1 lower than the control temperature (s0) set in step S10 ( It is determined whether or not t0 <s0). If it is determined that t0 <s0, the process proceeds to step S140. If it is not determined that t0 <s0 (t0 = t0), the process proceeds to step S150.

  In step S140, the second temperature controller 32 of the control unit 30 takes the difference between the temperature (t0) of the engine oil in the engine 1 and the control temperature (s0), and calculates the absolute value of the difference (| t0−s0 |). A heating signal for increasing the output of the second heater 19 in accordance with is generated and transmitted to the second heater 19. When this process is completed, the process proceeds to step S160.

  In step S150, the second temperature controller 32 of the control unit 30 maintains the output of the second heater 19 as it is. When this process is completed, the process proceeds to step S160.

  In step S160, the second heater 19 adjusts the output according to the heating signal transmitted in step S120, step S140, and step S150. When this process is completed, the process proceeds to step S30.

  By such feedback control, it is possible to keep the engine oil in the circulation path 12 at a substantially constant first temperature (s1), and the engine oil in the engine 1 is always centered on the control temperature (s0). Temperature fluctuation control within ± 1 degree is possible.

  FIG. 3 is an engine oil temperature control table executed by the control unit of the engine oil temperature control apparatus according to the first embodiment of the present invention.

  FIG. 3 shows a first temperature which is a set temperature of the engine oil in the buffer tank 18 with respect to a control temperature (s0) of the engine oil temperature in the engine 1 set on the operation panel 100 by an input from the user. It is a temperature control table of the engine oil when (s1) is set to be lower by a predetermined range (s1 <s2).

  The engine oil introduced from the engine 1 through the introduction path 11 is warmed by the load of the engine 1 and has a temperature higher than the control temperature (s0) that is the temperature of the desired engine oil in the engine 1. . The engine oil introduced into the circulation path 12 from the introduction path 11 is cooled 141 by the heat exchanger 16 in the circulation path 12, and the temperature drops to near the first temperature (s1) lower than the control temperature (s0). . Thereafter, the feedback control of the first temperature controller 31 shown in FIG. 2 controls the outputs of the first heater 17 and the heat exchanger 16, and the engine oil is stored in the buffer tank 18 at the first temperature ( The temperature is maintained 142 at s1).

  A part of the engine oil stored in the buffer tank 18 and kept at the first temperature (s1) is sent to the lead-out path 13, and is secondly higher than the control temperature (s0) by the second heater 19. The temperature is adjusted 143 to the temperature (s2). The second temperature (s2) is a temperature adjusted so that the engine oil becomes the control temperature at the engine lead-out point 140, which is the installation position of the first temperature sensor 41 that detects the temperature of the engine oil in the engine 1. It is. That is, the second heater 19 is controlled by the feedback control of the second temperature controller 32 shown in FIG. 2 so that the engine oil at the engine outlet point 140 becomes the control temperature.

  In this way, the engine oil in the circulation path 12 is always kept substantially constant at the first temperature (s1) lower than the control temperature (s0) by a predetermined range, so that the second heater 19 in the lead-out path 13 The temperature is raised to a temperature of 2 (s2), and temperature fluctuation control is made possible so that the temperature of the engine oil at the engine lead-out point 140 in the engine 1 is substantially the control temperature (s0). Further, since the first temperature (s1) lower than the control temperature (s0) can be promptly supplied into the engine 1 in response to a rapid temperature rise of the engine oil in the engine 1, the temperature of the engine oil in the engine 1 can be increased. Can be quickly returned to the control temperature.

  A modification of the above-described embodiment of the first embodiment of the present invention will be described with reference to FIGS. In addition, regarding the description of the following modification examples, the description of the same contents as those in the embodiment described above with reference to FIGS. 1 to 3 will be omitted.

  FIG. 4 is a configuration diagram illustrating a fluid temperature control device that controls engine oil provided in an engine test bench according to a modification of the first embodiment of the present invention.

  As in FIG. 1, the introduction path 11 includes an introduction port 14 that is an inlet for inputting engine oil derived from the engine 1. The circulation path 12 includes a pump 15 that pumps and circulates engine oil in the circulation path 12, and a first heat exchanger that regulates the engine oil that circulates in the circulation path 12 to a third temperature (s3). 16 and a first heater 17, and a buffer tank 18 for temporarily storing engine oil circulating in the circulation path 12. In addition, the lead-out path 13 includes a second heat exchanger 23 and a second heater 19 that adjust the temperature so that the temperature of the engine oil becomes the control temperature when returning from the circulation path 12 to the engine 1 via the lead-out path 13. And a return port 20 that is an outlet for returning the engine oil flowing through the outlet path 13 to the engine 1.

  The first heater 17 raises the temperature of the engine oil in the circulation path 12. The first heat exchanger 16 cools the engine oil with cooling water that exchanges heat with the engine oil in the circulation path 12. In the fluid temperature control device 7, a cooling water inlet 93 through which cooling water is introduced, a cooling introduction pipe 91 through which low-temperature cooling water from the cooling water inlet 93 flows, and heat exchange by the heat exchanger 16 cause high temperature. A cooling return pipe 92 through which the cooling water thus formed is provided, and a return opening 94 that is discharged from the cooling return pipe 92 to the outside of the fluid temperature control device 7 are provided. The cooling return pipe 92 has a first flow rate control valve 47 that controls the flow rate of the cooling water to the first heat exchanger 16. That is, the efficiency of cooling the engine oil of the first heat exchanger 16 is adjusted by the first flow rate control valve 47.

  Similarly, the second heater 19 raises the temperature of the engine oil in the outlet path 13. In addition, the second heat exchanger 23 cools the engine oil in the outlet passage 13 with the low-temperature cooling water from the cooling introduction pipe 91, and flows the cooling water that has been heat-exchanged to a high temperature to the cooling return pipe 92. Let The cooling introduction pipe 91 has a second flow rate control valve 24 that controls the flow rate of the cooling water to the second heat exchanger 23. That is, the efficiency of cooling the engine oil in the second heat exchanger 23 is adjusted by the second flow rate control valve 24.

  Further, the fluid temperature control device 7 is provided with a control unit 30 that controls the first heat exchanger 16, the first heater 17, the second heat exchanger 23, and the second heater 19 that regulate the engine oil temperature. . The control unit 30 includes a first temperature sensor 41 that detects the temperature of the engine oil of the engine 1, a second temperature sensor 42 that detects the temperature of the engine oil in the buffer tank 18, and the circulation detected by the second temperature sensor 42. Based on the temperature of the engine oil flowing through the passage 12, a first temperature controller 31 for adjusting the temperature of the engine oil circulating in the circulation passage 12 to the third temperature (s 3), and a first temperature sensor 41 Based on the detected temperature of the engine oil of the engine 1, the second temperature controller 32 for adjusting the temperature of the engine oil flowing through the outlet passage 13 to the fourth temperature (s 4), and the first heat exchanger 16 The first X characteristic converter 33 that generates a control signal for controlling the first flow control valve 47 and the first heater 17, and the second flow control valve 24 and the second heater 19 of the second heat exchanger 23 are controlled. Control signal for That the first 2X characteristic converter 25, and a.

  The first temperature controller 31 receives a detection signal from the second temperature sensor 42 that detects the temperature of the engine oil in the buffer tank 18, and based on this detection signal, the engine oil temperature in the buffer tank 18 is third. The control signal is transmitted to the first X characteristic converter 33 so that the temperature (s3) is reached. The first X characteristic converter 33 converts the cooling signal and the heating signal based on the control signal from the first temperature controller 31. The cooling signal output from the first X characteristic converter 33 is input to the first flow control valve 47 of the first heat exchanger 16 and the heating signal is input to the first heater 17 to control the respective outputs. Further, the engine oil adjusted in temperature by the first heat exchanger 16 and the first heater 17 is detected again by the second temperature sensor 42 in the buffer tank 18 and is fed back to control the engine oil in the buffer tank 18. The temperature can be maintained at the third temperature (s3).

  Similarly, the second temperature controller 32 receives a detection signal from the first temperature sensor 41 that detects the temperature of the engine oil in the engine 1, and the engine oil temperature in the engine 1 is controlled based on this detection signal. A control signal for setting the engine oil temperature of the outlet path 13 to the fourth temperature (s4) so as to be the temperature (s0) is transmitted to the second X characteristic converter 25. The second X characteristic converter 25 converts the cooling signal and the heating signal based on the control signal from the second temperature controller 32. The cooling signal output from the second X characteristic converter 25 is input to the second flow rate control valve 24 of the second heat exchanger 23 and the heating signal is input to the second heater 19 to control the respective outputs. The engine oil adjusted to the fourth temperature (s4) by the second heat exchanger 23 and the second heater 19 is led into the engine 1 and the temperature of the engine oil becomes the control temperature (s0). Moreover, the temperature of the engine oil in the engine 1 can be held at the control temperature (s0) by detecting the temperature of the engine oil again with the first temperature sensor 41 in the engine 1 and performing feedback control.

  In addition, the fluid temperature control device 7 is provided with an operation panel 100 that performs input and output with respect to the control unit 30. The operation panel 100 inputs and sets the set temperature (control temperature: s0) of the engine oil temperature in the engine 1 and the set temperature (third temperature: s3) of the engine oil temperature in the buffer tank 18 by the user. The temperature information of the engine oil detected by the setting unit (not shown), the first temperature sensor 41 and the second temperature sensor 42, the control information of the first temperature controller 31 and the second temperature controller 32, and the first A flow rate control valve 47, a second flow rate control valve 24, a first heater 17, and a display unit (not shown) for displaying output information of the second heater 19 and the like are provided. The user can check the temperature state of the engine oil and the state of the fluid temperature control device 7 based on the information displayed on the display unit.

  In the setting unit of the operation panel 100, the user first inputs a desired temperature (control temperature: s0) of the engine oil temperature in the engine 1. Next, the engine oil temperature in the buffer tank 18 is set by inputting a temperature difference with respect to the previously set control temperature (s0). For example, when the control temperature (s0) of the engine oil temperature in the engine 1 is set to 90 ° C., the engine oil temperature in the buffer tank 18 is set to + 2 ° C. from the control temperature (s0) of the engine oil temperature in the engine 1. By inputting and setting, the engine oil temperature in the buffer tank 18 can be set to 92 ° C. (third temperature: s3). The input range of the temperature difference for setting the third temperature (s3) of the engine oil temperature in the buffer tank 18 is provided with a predetermined range (for example, ± 5 ° C.). Then, the temperature difference within the predetermined range is input to set the third temperature (s3) of the engine oil temperature in the buffer tank 18.

  FIG. 5 is an engine oil temperature control table executed by the control unit of the engine oil temperature control apparatus according to the modification of the first embodiment of the present invention.

  FIG. 5 shows a third temperature that is the set temperature of the engine oil in the buffer tank 18 with respect to the control temperature (s0) of the engine oil temperature in the engine 1 set on the operation panel 100 by the input from the user. It is a temperature control table of the engine oil when (s3) is set higher by a predetermined range (s3 <s2).

  The engine oil introduced from the engine 1 through the introduction path 11 is warmed by the load of the engine 1 and has a temperature higher than the control temperature (s0) that is the temperature of the desired engine oil in the engine 1. . The engine oil introduced into the circulation path 12 from the introduction path 11 is cooled 141 by the first heat exchanger 16 in the circulation path 12 and is heated to a temperature around the third temperature (s3) slightly higher than the control temperature (s0). Descends. Thereafter, the output of the first heater 17 and the first heat exchanger 16 is controlled in the same manner as the feedback control of the first temperature controller 31 shown in FIG. The temperature is maintained 142 at a temperature 3 (s3).

  A part of the engine oil stored in the buffer tank 18 and kept at the third temperature (s3) is sent to the lead-out path 13, cooled by the second heat exchanger 23, and slightly lower than the control temperature (s0). The temperature is adjusted 143 to the high fourth temperature (s4). The fourth temperature (s4) is adjusted so that the engine oil becomes the control temperature (s0) at the engine lead-out point 140 where the first temperature sensor 41 that detects the temperature of the engine oil in the engine 1 is installed. It is a warm temperature. That is, similarly to the feedback control of the second temperature controller 32, the second heat exchanger 23 and the second heater 19 are controlled so that the engine oil at the engine outlet point 140 becomes the control temperature.

  In this way, the engine oil in the circulation path 12 is always kept substantially constant at the third temperature (s3) that is higher than the control temperature (s0) by a predetermined range, so that the second heat exchanger 23 in the outlet path 13 and The temperature is controlled to the fourth temperature (s4) by the second heater 19 to enable temperature fluctuation control in which the temperature of the engine oil at the engine lead-out point 140 in the engine 1 is substantially the control temperature (s0). . In addition, when the engine oil in the engine 1 is low at the time of starting the engine or during a low load, the third temperature (s3) higher than the control temperature (s0) can be quickly supplied into the engine 1. The engine oil temperature in the engine 1 can be quickly brought to the control temperature.

  Therefore, according to the present embodiment, in the measurement of the driving resistance of the engine 1, the fluid having a large temperature fluctuation depending on the load of the engine 1 is supplied to the engine by the heat exchanger 16 and the first heater 17 provided in the circulation path 12. By adjusting to a constant temperature in an environment that is not affected by the load of 1, the fluctuation of the temperature of the fluid can be suppressed. Further, in the second heater 19, the temperature can be adjusted to the required fluid temperature quickly because the heat exchanger 16 and the first heater 17 have already adjusted the temperature to a constant value. Therefore, even if the load fluctuation of the engine 1 is large, the temperature of the fluid in the engine 1 can be immediately adjusted to a temperature that becomes the control temperature, and the fluctuation of the temperature of the fluid in the engine 1 can be reduced. And the control precision of the temperature adjustment of a fluid can be improved.

  Further, according to the present embodiment, the buffer tank that circulates in the circulation path 12 and temporarily stores the fluid at a constant temperature in an environment that is not affected by the load of the engine 1 by the heat exchanger 16 and the first heater 17. By providing 18, even if the temperature fluctuation range is large due to the load fluctuation of the engine 1, it is possible to follow the fluctuation range of the load of the engine 1 in a wide range by the amount of fluid stored in the buffer tank 18. Highly accurate fluid temperature adjustment.

  As described above, in this embodiment, the temperature of the fluid is adjusted by quickly adjusting to a predetermined temperature against a sudden temperature change of the fluid circulating in the drive system of the internal combustion engine and holding the fluid at a constant temperature. Can provide a fluid temperature control method and apparatus with high accuracy.

According to the present embodiment, the engine oil has been described as an example of the fluid for adjusting the temperature of the drive system in the measurement of the drive resistance of the internal combustion engine, but is not particularly limited. For example, transmission oil for the transmission 3 or engine cooling water for the engine 1 may be used. The transmission oil for the transmission 3 includes mission oil used in the manual transmission (M / T) and ATF used in the automatic transmission (A / T). Further, when adjusting the temperature of the mission oil in the measurement of the driving resistance of the internal combustion engine, the inlet of the introduction path 11 is connected to a pipe into which the mission oil is introduced from the transmission 3, and the return port of the outlet path 13. 20 is connected to a pipe through which mission oil is returned to the transmission 3, and the first temperature sensor 41 is provided in the transmission 3.
(Embodiment 2)

  Next, Embodiment 2 of the present invention will be described by taking as an example a fluid temperature control method and apparatus capable of controlling the temperatures of three fluids of engine oil, engine coolant, and mission oil in an engine test bench.

  FIG. 6 is a configuration diagram illustrating a fluid temperature control device that controls the temperatures of engine oil, engine cooling water, and mission oil provided in an engine test bench according to Embodiment 2 of the present invention. The mission oil includes the mission oil used in the manual transmission (M / T) and the ATF used in the automatic transmission (A / T). In the following description, the transmission oil used in the manual transmission (M / T) will be described as an example.

  As shown in FIG. 6, the fluid temperature control device 7 has a structure in which three temperature control devices for engine oil shown in FIG. 1 are combined. The fluid temperature control device 7 includes an engine oil temperature adjustment unit 10, an engine coolant temperature adjustment unit 50, and a mission oil temperature adjustment unit 70, respectively. The configuration of the engine oil temperature adjusting unit 10 and the temperature control method are the same as those in the first embodiment of the present invention shown in FIGS.

  The engine cooling water temperature adjusting unit 50 includes an introduction path 51 for deriving engine cooling water from the engine 1, a circulation path 52 provided in series with the introduction path 51 for circulating the engine cooling water derived from the introduction path 51, and circulation A fluid path 62 having an outlet path 53 for returning the engine coolant in the path 52 to the engine 1 is provided.

  The introduction path 51 includes an introduction port 54 that is an inlet for inputting engine coolant derived from the engine 1. The circulation path 52 includes a pump 55 that pumps and circulates engine cooling water in the circulation path 52, a heat exchanger 56 that adjusts the engine cooling water circulating in the circulation path 52 to a first temperature, and a first temperature. 1 heater 57 and a buffer tank (engine cooling water tank) 58 for temporarily storing engine cooling water circulating in the circulation path 52. In addition, the lead-out path 53 includes a second heater 59 that adjusts the temperature of the engine coolant so that the temperature of the engine cooling water becomes the control temperature when returning from the circulation path 52 to the engine 1 via the lead-out path 53. And a return port 60 that is an outlet for returning the flow of the engine cooling water to the engine 1. Further, the circulation path 52 has a circulation path 61 for returning the engine coolant that circulates in the circulation path from the connection portion side to the lead-out passage 53 provided on the downstream side of the buffer tank 58 to the connection portion side to the introduction passage 51. doing.

  In addition, the engine coolant temperature adjustment unit 50 includes a first temperature sensor 43 that detects the temperature of the engine coolant of the engine 1 and a second temperature that detects the temperature of the engine coolant in the buffer tank 58 in the control unit 30. Based on the temperature of the engine cooling water flowing through the circulation path 52 detected by the temperature sensor 44 and the second temperature sensor 44, the temperature of the engine cooling water circulating in the circulation path 52 is adjusted to the first temperature. Based on the temperature of the engine cooling water of the engine 1 detected by the first temperature controller 34 and the first temperature sensor 43, the engine cooling water flowing through the outlet passage 53 by controlling the second heater 59 is second A second temperature controller 35 that adjusts the temperature, a flow rate control valve 48 that adjusts the flow rate of cooling water in the heat exchanger 56, and an X characteristic converter 36 that generates a control signal for controlling the first heater 57. I have.

  As described above, the engine coolant temperature adjusting unit 50 has the same configuration as the engine oil temperature adjusting unit 10, and is different in that the fluid derived from the drive system 6 is engine coolant. Therefore, the temperature control method of the engine coolant temperature adjustment unit 50 is the same as the engine oil temperature control method shown in FIGS.

  The mission oil temperature adjusting unit 70 includes an introduction path 71 that leads out the mission oil from the transmission 3, a circulation path 72 that is provided in series with the introduction path 71 and through which the mission oil led out from the introduction path 71 circulates, A fluid path 82 having a lead-out path 73 for returning the transmission oil to the transmission 3 is provided.

  The introduction path 71 includes an introduction port 74 that is an inlet for inputting mission oil derived from the transmission 3. The circulation path 72 includes a pump 75 that pumps and circulates the mission oil in the circulation path 72, and a heat exchanger 76 and a first heater 77 that regulate the mission oil that circulates in the circulation path 72 to a first temperature. And a buffer tank (mission oil tank) 78 for temporarily storing the mission oil circulating in the circulation path 72. In addition, the lead-out path 73 flows through the lead-out path 73 and a second heater 79 that adjusts the temperature of the mission oil so that the temperature of the mission oil becomes the control temperature when returning from the circulation path 72 to the transmission 3 via the lead-out path 73. And a return port 80 which is an outlet for returning the transmitted mission oil to the transmission 3. Further, the circulation path 72 has a circulation path 81 for returning the mission oil that circulates in the circulation path from the connection portion side with the lead-out passage 73 provided on the downstream side of the buffer tank 78 to the connection portion side with the introduction passage 71. ing.

  The mission oil temperature adjusting unit 70 includes a first temperature sensor 45 that detects the temperature of the mission oil of the transmission 3 and a second temperature sensor 46 that detects the temperature of the mission oil in the buffer tank 78. A first temperature controller 37 for adjusting the temperature of the mission oil circulating in the circulation path 72 to the first temperature based on the temperature of the mission oil flowing through the circulation path 72 detected by the second temperature sensor 46; Based on the temperature of the transmission oil of the transmission 3 detected by the first temperature sensor 45, the second temperature is controlled to control the second heater 79 to control the temperature of the transmission oil flowing through the outlet path 73 to the second temperature. An X characteristic converter that generates a control signal for controlling the first heater 77 and the flow rate control valve 49 that adjusts the flow rate of the cooling water of the conditioner 38, the heat exchanger 76 It is equipped with a 9.

  As described above, the mission oil temperature adjustment unit 70 has substantially the same configuration as the engine oil temperature adjustment unit 10, except that the fluid derived from the drive system 6 is mission oil. Therefore, the temperature control method of the mission oil temperature adjusting unit 70 is the same as the engine oil temperature control method shown in FIG. 2 and FIG.

  In addition, the fluid temperature control device 7 is provided with an operation panel 100 that performs input and output with respect to the control unit 30. The operation panel 100 is set to set the control temperature of the engine oil temperature in the engine 1, the control temperature of the engine coolant temperature, and the control temperature of the mission oil temperature in the transmission 3 to respective user desired temperatures. (Not shown), information on engine oil temperature, engine coolant temperature, and mission oil temperature detected by each temperature sensor 41-46, each first temperature controller 31, 34, 37 and second temperature controller 32, 35, 38 control information, and display units for displaying output information of the flow control valves 47, 48, 49, the first heaters 17, 57, 77 and the second heaters 19, 59, 79, etc. (Not shown). The user can check the temperature transition of the engine oil, the temperature transition of the engine cooling water, the temperature transition of the mission oil, and the operating state of the fluid temperature control device 7 by the information displayed on the display unit.

  Further, in the setting unit of the operation panel 100, the temperature of the fluid in each buffer tank 18, 58, 78 is input and set by the user. The user first inputs a desired temperature (control temperature) of the fluid in the engine 1 or the transmission 3. Next, the temperature of the fluid in each buffer tank 18, 58, 78 is set by inputting a temperature difference with respect to the previously set control temperature. The input range of the temperature difference is a predetermined range, and the user inputs the temperature difference within the predetermined range and the engine oil temperature in each of the buffer tanks 18, 58, 78 is changed. Set the temperature of 1.

  As described above, according to the second embodiment of the present invention, the fluid in the measurement of the driving resistance of the internal combustion engine is the engine oil, the mission oil, and the engine cooling water, and the fluid path, the cooling means, and the first temperature adjusting means. The second temperature adjusting means and the storing means are provided corresponding to each of the engine oil, the mission oil, and the engine cooling water.

  According to this embodiment, it is possible to adjust the temperature of the engine oil, the mission oil, and the engine coolant used in the drive system 6 of the engine 1 with high accuracy. In addition, a fluid temperature control device 7 is provided, which simultaneously includes an engine oil temperature adjusting unit 10, an engine cooling water temperature adjusting unit 50, and a mission oil temperature adjusting unit 70 corresponding to engine oil, mission oil, and engine cooling water, respectively. Thus, the temperature adjustment of each fluid by the load of the engine 1 can be collectively controlled. Therefore, convenience in measuring the driving resistance of the engine 1 is improved.

  As described above, in this embodiment, the temperature of the fluid is adjusted by quickly adjusting to a predetermined temperature against a sudden temperature change of the fluid circulating in the drive system of the internal combustion engine and holding the fluid at a constant temperature. Can provide a fluid temperature control method and apparatus with high accuracy.

  In the first and second embodiments of the present invention, an engine test bench has been described as an example of a fluid temperature control apparatus and method for measuring drive resistance of an internal combustion engine. It is not particularly limited to resistance measurement. In the first and second embodiments of the present invention, the method for adjusting the temperature of the engine oil involved in the measurement of the driving resistance of the internal combustion engine has been described as an example. However, it is possible to adjust the temperature by the same method. If it is a test body, it is possible to apply suitably also to other test bodies, such as temperature control of a metal mold | die.

  The preferred embodiments of the present invention have been described above. However, the present invention can be variously modified and changed without departing from the concept of the claims.

It is a block diagram which shows the fluid temperature control apparatus which controls the engine oil with which the engine test bench which concerns on Embodiment 1 of this invention was equipped. It is a flowchart which shows the temperature control process of the engine oil performed by the control part of the engine oil temperature control apparatus which concerns on Embodiment 1 of this invention. It is a temperature control table of the engine oil performed by the control part of the engine oil temperature control apparatus which concerns on Embodiment 1 of this invention. It is a block diagram which shows the fluid temperature control apparatus which controls the engine oil with which the engine test bench which concerns on the modification of Embodiment 1 of this invention was equipped. It is a temperature control table of the engine oil performed by the control part of the engine oil temperature control apparatus which concerns on the modification of Embodiment 1 of this invention. It is a block diagram which shows the fluid temperature control apparatus which controls the engine oil with which the engine test bench which concerns on Embodiment 2 of this invention was equipped, the engine cooling water, and the mission oil. It is the fluid temperature control apparatus which controls the engine oil with which the conventional engine test bench was equipped.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Engine 2 axis | shaft torque meter 3 Transmission 4 Dynamo 5 Shaft 6 Drive system 7 Fluid temperature control apparatus 10 Engine oil temperature control part 11, 51, 71 Introduction path 12, 52, 72 Circulation path 13, 53, 73 Derivation path 14, 54 , 74 Inlet 15, 55, 75 Pump 16, 56, 76 Heat exchanger 17, 57, 77 First heater 18, 58, 78 Buffer tank 19, 59, 79 Second heater 20, 60, 80 Return port 21, 61, 81 Circulation path 22, 62, 82 Fluid path 23 Second heat exchanger 24 Second flow rate adjustment valve 25 Second X characteristic converter 30 Control unit 31, 34, 37 First temperature controller 32, 35, 38 Second Temperature controller 33, 36, 39 X characteristic converter 41-46 Temperature sensor 47, 48, 49 Flow rate adjustment valve 50 Engine coolant temperature adjustment unit 70 Cushion oil temperature adjusting unit 91 Cooling water introduction pipe 92 Cooling water return pipe 93 Cooling water inlet 94 Cooling water outlet 100 Operation panel 110 Engine oil temperature control device 111 Oil flow path 112 Inlet 113 Pump 114 Cooler 115 Heater 116 Return opening 120 Control part 121 Temperature controller 122 Converter 123, 124, 125, 126 Temperature sensor 130 Operation panel

Claims (22)

An introduction path for introducing fluid from a drive system equipped with an internal combustion engine, a circulation path connected in series to the introduction path, in which the fluid introduced from the introduction path circulates, and circulating in the circulation path A fluid path having a lead-out path for leading the fluid to be driven to the drive system, cooling means provided in the fluid path, the cooling means for lowering the temperature of the fluid introduced from the drive system, An internal combustion engine in which the fluid cooled by the cooling means is adjusted to a control temperature set based on conditions necessary for performing a performance test of the drive system, and the fluid is again led to the drive system through the lead-out path. A fluid temperature adjustment method in an engine driveline performance test,
A first temperature sensor that detects the temperature of the fluid in the buffer tank that temporarily stores the fluid in the circulation path is provided in the buffer tank, and is circulated in the circulation path by a detection signal of the first temperature sensor. A first temperature adjusting step for adjusting the temperature of the fluid being adjusted to a temperature in the vicinity of the control temperature;
A second temperature sensor for detecting the temperature of the fluid in the drive system is provided in the drive system, and the temperature is detected in the first temperature adjustment step in the lead-out path by a detection signal of the second temperature sensor. A second temperature adjustment step of adjusting the adjusted temperature of the fluid to a temperature at which the temperature of the fluid in the drive system becomes the control temperature;
A fluid temperature adjusting method characterized by comprising: An introduction step of introducing a fluid from a drive system equipped with an internal combustion engine into the circulation path via the introduction path;
A cooling step for lowering the temperature of the fluid introduced into the circulation path;
A first temperature sensor that detects the temperature of the fluid in the buffer tank that temporarily stores the fluid in the circulation path is provided in the buffer tank, and is circulated in the circulation path by a detection signal of the first temperature sensor. A first temperature adjustment step of adjusting the temperature of the fluid being adjusted to a temperature in the vicinity of a control temperature set based on conditions necessary for performing a performance test of the drive system;
A second temperature sensor for detecting the temperature of the fluid in the drive system is provided in the drive system, and a lead-out path for leading the fluid circulating in the circulation path to the drive system by a detection signal of the second temperature sensor A second temperature adjusting step for adjusting the temperature of the fluid whose temperature is adjusted in the first temperature adjusting step to a temperature at which the temperature of the fluid in the drive system becomes the control temperature;
A fluid temperature adjustment method in a drive system performance test of an internal combustion engine, comprising:   The fluid temperature adjusting method according to claim 1, further comprising a heat retaining step for retaining the fluid whose temperature has been adjusted in the first temperature adjusting step at a constant temperature.   The fluid temperature adjusting method according to any one of claims 1 to 3, further comprising a storing step of temporarily storing a fluid circulating in the circulation path. An introduction path for introducing fluid from a drive system equipped with an internal combustion engine, a circulation path connected in series to the introduction path, in which the fluid introduced from the introduction path circulates, and circulating in the circulation path A fluid path having a lead-out path for leading the fluid to be driven to the drive system, cooling means provided in the fluid path, the cooling means for lowering the temperature of the fluid introduced from the drive system, An internal combustion engine in which the fluid cooled by the cooling means is adjusted to a control temperature set based on conditions necessary for performing a performance test of the drive system, and the fluid is again led to the drive system through the lead-out path. A fluid temperature adjustment method in an engine driveline performance test,
A first temperature sensor that detects the temperature of the fluid in the buffer tank that temporarily stores the fluid in the circulation path is provided in the buffer tank, and is circulated in the circulation path by a detection signal of the first temperature sensor. A first temperature adjusting step for adjusting the temperature of the fluid being adjusted to a temperature in the vicinity of the control temperature;
A heat retaining step for retaining the fluid whose temperature has been adjusted in the first temperature adjusting step at a constant temperature;
A storage step for temporarily storing fluid circulating in the circulation path;
A second temperature sensor for detecting the temperature of the fluid in the drive system is provided in the drive system, and the temperature is detected in the first temperature adjustment step in the lead-out path by a detection signal of the second temperature sensor. A second temperature adjustment step of adjusting the adjusted temperature of the fluid to a temperature at which the temperature of the fluid in the drive system becomes the control temperature;
Fluid temperature control method characterized by comprising   Control is performed so that the temperature of the fluid circulated in the circulation path is adjusted to the vicinity of the control temperature, and the temperature of the fluid led out in the lead-out path becomes the control temperature. The fluid temperature adjusting method according to any one of claims 1 to 5, further comprising a control step of controlling to adjust to a temperature. A first detection step of detecting a temperature of a fluid circulated in the circulation path;
A second detection step of detecting the temperature of the fluid in the drive system,
In the control step, based on the temperature of the fluid circulating in the circulation path detected in the first detection step, the temperature of the fluid circulating in the circulation path is adjusted to the vicinity of the control temperature. Based on the temperature of the fluid in the drive system detected in the second detection step, the temperature of the fluid derived in the lead-out path becomes the control temperature based on the temperature of the fluid in the drive system. 7. The fluid temperature adjusting method according to claim 6, wherein control is performed so as to adjust the temperature. The first temperature adjustment step adjusts the fluid circulating in the circulation path to a first temperature lower than the control temperature by a predetermined range;
The heat retaining step retains the fluid adjusted in the first temperature adjusting step at the first temperature;
In the second temperature adjustment step, the fluid kept in the heat retaining step is adjusted to a second temperature higher than the control temperature by a predetermined range in the lead-out path for leading the fluid circulating in the circulation path to the drive system. 6. The fluid temperature adjusting method according to claim 3, wherein the fluid temperature is adjusted. The first temperature adjusting step adjusts the fluid circulating in the circulation path to a third temperature that is higher than the control temperature by a predetermined range;
The heat retaining step retains the fluid adjusted in the first temperature adjusting step at the third temperature;
In the second temperature adjustment step, in the lead-out path for leading the fluid circulating in the circulation path to the drive system, the fluid kept in the heat keeping step is higher than the control temperature by a predetermined range,
6. The fluid temperature adjusting method according to claim 3, wherein the fluid temperature is adjusted to a fourth temperature lower than the third temperature.   The fluid temperature adjusting method according to any one of claims 1 to 9, wherein the fluid is any one of engine oil, mission oil, and engine cooling water. An introduction path for introducing fluid from a drive system equipped with an internal combustion engine, a circulation path connected in series to the introduction path, in which the fluid introduced from the introduction path circulates, and circulating in the circulation path A fluid path having a lead-out path for leading the fluid to be driven to the drive system, cooling means provided in the fluid path, the cooling means for lowering the temperature of the fluid introduced from the drive system, An internal combustion engine in which the fluid cooled by the cooling means is adjusted to a control temperature set based on conditions necessary for performing a performance test of the drive system, and the fluid is again led to the drive system through the lead-out path. A fluid temperature adjusting device in an engine drive system performance test,
A first temperature sensor that detects the temperature of the fluid in the buffer tank that temporarily stores the fluid in the circulation path is provided in the buffer tank, and is circulated in the circulation path by a detection signal of the first temperature sensor. First temperature adjusting means for adjusting the temperature of the fluid being adjusted to a temperature in the vicinity of the control temperature;
A second temperature sensor for detecting the temperature of the fluid in the drive system is provided in the drive system, and the temperature is detected by the first temperature adjusting means in the lead-out path based on a detection signal of the second temperature sensor . Second temperature adjusting means for adjusting the temperature of the adjusted fluid to a temperature at which the temperature of the fluid in the drive system becomes the control temperature;
A fluid temperature adjusting device comprising: An introduction path for introducing fluid from a drive system equipped with an internal combustion engine, a circulation path connected in series to the introduction path, in which the fluid introduced from the introduction path circulates, and circulating in the circulation path A fluid path having a lead-out path for leading the fluid to be driven to the drive system;
Cooling means for lowering the temperature of the fluid introduced into the circulation path;
A first temperature sensor that detects the temperature of the fluid in the buffer tank that temporarily stores the fluid in the circulation path is provided in the buffer tank, and is circulated in the circulation path by a detection signal of the first temperature sensor. First temperature adjusting means for adjusting the temperature of the fluid being adjusted to a temperature in the vicinity of a control temperature set based on conditions required for performing a performance test of the drive system;
A second temperature sensor for detecting the temperature of the fluid in the drive system is provided in the drive system, and a lead-out path for leading the fluid circulating in the circulation path to the drive system by a detection signal of the second temperature sensor A second temperature adjusting means for adjusting the temperature of the fluid whose temperature has been adjusted by the first temperature adjusting means to a temperature at which the temperature of the fluid in the drive system becomes the control temperature;
A fluid temperature adjusting device in a drive system performance test of an internal combustion engine, comprising:   The heat retaining means provided in the circulation path, further comprising heat retaining means for retaining the fluid whose temperature is adjusted by the first temperature adjusting means at a constant temperature. 12. The fluid temperature adjusting device according to 12.   The fluid according to any one of claims 11 to 13, further comprising storage means provided in the circulation path, which temporarily stores a fluid circulating in the circulation path. Temperature control device. An introduction path for introducing fluid from a drive system equipped with an internal combustion engine, a circulation path connected in series to the introduction path, in which the fluid introduced from the introduction path circulates, and circulating in the circulation path A fluid path having a lead-out path for leading the fluid to be driven to the drive system, cooling means provided in the fluid path, the cooling means for lowering the temperature of the fluid introduced from the drive system, An internal combustion engine in which the fluid cooled by the cooling means is adjusted to a control temperature set based on conditions necessary for performing a performance test of the drive system, and the fluid is again led to the drive system through the lead-out path. A fluid temperature adjusting device in an engine drive system performance test,
A first temperature sensor that detects the temperature of the fluid in the buffer tank that temporarily stores the fluid in the circulation path is provided in the buffer tank, and is circulated in the circulation path by a detection signal of the first temperature sensor. First temperature adjusting means for adjusting the temperature of the fluid being adjusted to a temperature in the vicinity of the control temperature;
Heat retaining means for retaining the fluid whose temperature has been adjusted by the first temperature adjusting means at a constant temperature;
A storage means for temporarily storing a fluid circulating in the circulation path;
A second temperature sensor for detecting the temperature of the fluid in the drive system is provided in the drive system, and the temperature is detected by the first temperature adjusting means in the lead-out path based on a detection signal of the second temperature sensor. Second temperature adjusting means for adjusting the temperature of the adjusted fluid to a temperature at which the temperature of the fluid in the drive system becomes the control temperature;
A fluid temperature control device comprising:   Control is performed so that the temperature of the fluid circulated in the circulation path is adjusted to the vicinity of the control temperature, and the temperature of the fluid led out in the lead-out path becomes the control temperature. The fluid temperature adjusting device according to any one of claims 11 to 15, further comprising control means for controlling to adjust the temperature. First detection means provided in the circulation path, the first detection means for detecting the temperature of the fluid circulated in the circulation path;
A second detection means provided in the drive system, the second detection means for detecting the temperature of the fluid in the drive system,
The control means adjusts the temperature of the fluid circulating in the circulation path to the vicinity of the control temperature based on the temperature of the fluid circulating in the circulation path detected by the first detection means. Based on the temperature of the fluid in the drive system detected by the second detection means, the temperature of the fluid derived in the lead-out path becomes the control temperature that is the temperature of the fluid in the drive system. The fluid temperature adjusting device according to claim 16, wherein the fluid temperature adjusting device is controlled to adjust to a temperature.   15. The storage unit according to claim 14, wherein a storage amount of the temporarily stored fluid is larger than a fluid amount including a fluid amount in the driving system and a fluid amount in the fluid path by a predetermined range. Item 16. The fluid temperature adjusting device according to Item 15. The first temperature adjusting means adjusts the fluid circulating in the circulation path to a first temperature lower than the control temperature by a predetermined range,
The heat retaining means retains the fluid adjusted by the first temperature adjusting means at the first temperature;
The second temperature adjusting means adjusts the fluid kept by the heat keeping means to a second temperature higher than the control temperature by a predetermined range in the lead-out path for leading the fluid circulating in the circulation path to the drive system. The fluid temperature adjusting device according to any one of claims 13 and 15 , wherein The first temperature adjusting means adjusts the fluid circulating in the circulation path to a third temperature higher than the control temperature by a predetermined range,
The heat retaining means retains the fluid adjusted by the first temperature adjusting means at the third temperature;
The second temperature adjusting means is configured to cause the fluid retained by the heat retaining means to be higher than the control temperature by a predetermined range in the lead-out path for leading the fluid circulating in the circulation path to the drive system, and The fluid temperature adjusting device according to claim 13 , wherein the temperature is adjusted to a fourth temperature lower than the temperature. The first temperature adjusting means is provided on the downstream side of the cooling means,
The fluid temperature adjusting device according to any one of claims 14, 15, and 18 , wherein the storage means is provided downstream of the first temperature adjusting means. The fluid temperature adjusting device according to any one of claims 11 to 21, wherein the fluid is any one of engine oil, mission oil, and engine cooling water.

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