Oil temperature regulation system

Abstract

To provide an oil temperature regulation system that enables both of a cooling action and a lubrication action by using oil.SOLUTION: An oil temperature regulation system 10 includes: a first oil path that is a path installed so that oil flowing from an apparatus passes through a vaporizer 13 and returns to the apparatus without passing through a heat exchanger 15 for exchanging heat between hydrogen decompressed by a regulator 14 and the oil; and a second oil path that is a path installed so that oil flowing from the apparatus passes through the heat exchanger 15 and returns to the apparatus without passing through the vaporizer 13. In the oil temperature regulation system 10, a control device 18 controls a regulation valve 30 to increase an amount of the oil flowing in the first oil path and reduce the amount of the oil flowing in the second oil path when a temperature of the oil is lowered. The control device 18 controls the regulation valve 30 to increase the amount of the oil flowing in the second oil path and reduce the amount of the oil flowing in the first oil path when the temperature of the oil is raised.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an oil temperature control system. [Background technology]

[0002] Patent Document 1 discloses a fuel supply system. In this fuel supply system, liquefied fuel stored in a tank is vaporized in a vaporizer and then supplied to an engine. The vaporizer vaporizes the liquefied fuel using heat from cooling water that is warmed by heat exchange with the exhaust gas of the engine. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-46801 Summary of the Invention [Problem to be solved by the invention]

[0004] Vehicles rely on some oils, such as transaxle oil, for cooling and lubricating functions to run. When the oil exceeds a certain temperature, it is no longer able to provide an effective cooling function, and when the oil falls below a certain temperature, it no longer has a viscosity that allows it to provide an effective lubricating function. [Means for solving the problem]

[0005] The means for solving the above problems and their effects will be described below. The oil temperature regulation system for solving the above problems is applied to a vehicle equipped with a fuel supply system that vaporizes liquid hydrogen stored in a tank and supplies it to the engine as fuel. The oil temperature regulation system includes a device that utilizes the cooling and lubricating effects of oil, a carburetor that vaporizes liquid hydrogen, a regulator that reduces the pressure of the vaporized hydrogen and supplies it to the engine, and a heat exchanger that exchanges heat between the oil and the hydrogen reduced in pressure by the regulator. The oil temperature regulation system also includes a first oil path that is a path installed so that the oil flowing from the device passes through the carburetor and returns to the device without passing through the heat exchanger, a second oil path that is a path installed so that the oil flowing from the device passes through the heat exchanger and returns to the device without passing through the carburetor, a control device that controls the control valve, and a control device that controls the control valve. In this oil temperature regulation system, the control device controls the adjustment valve to increase the amount of oil flowing through the first oil path and decrease the amount of oil flowing through the second oil path when lowering the temperature of the oil. In this oil temperature regulation system, the control device controls the adjustment valve to increase the amount of oil flowing through the second oil path and decrease the amount of oil flowing through the first oil path when raising the temperature of the oil. Effect of the Invention

[0006] The oil temperature regulation system is capable of achieving both the cooling and lubricating functions of oil. [Brief description of the drawings]

[0007] [Figure 1] FIG. 1 is a schematic diagram showing the configuration of an oil temperature regulating system according to one embodiment. [Diagram 2] FIG. 2 is a flowchart showing a flow of processing related to the regulation of the oil temperature by opening and closing a valve, which is executed by the control device in the oil temperature regulation system of the embodiment. [Diagram 3]FIG. 3 is a flowchart showing a process flow related to the regulation of the oil temperature by adjusting the valve opening degree executed by the control device in the oil temperature regulation system of the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] An embodiment of the oil temperature regulation system will be described below with reference to Figures 1 and 2. The oil temperature regulation system 10 is applied to a liquid hydrogen vehicle that uses vaporized liquid hydrogen as fuel. <Fuel supply system configuration> As shown in FIG. 1, a vehicle to which an oil temperature regulation system 10 is applied includes a fuel supply system for an engine 17, which includes a tank 11, a tank pump 12, a carburetor 13, a regulator 14, and a pressure chamber 16.

[0009] Tank 11 stores liquid hydrogen supplied from outside the vehicle. Tank 11 has high thermal insulation performance and can store liquid hydrogen while keeping it in a liquid state. Tank 11 is connected to vaporizer 13 by first hydrogen piping 101.

[0010] A tank pump 12 is installed in tank 11. Tank pump 12 pumps up liquid hydrogen in tank 11 and supplies it to vaporizer 13. The liquid hydrogen pumped up by tank pump 12 is supplied to vaporizer 13 through first hydrogen piping 101.

[0011] The vaporizer 13 vaporizes the liquid hydrogen that is supplied to it. A cooling water pipe and an oil pipe, which will be described later, pass through the vaporizer 13. The vaporizer 13 vaporizes the liquid hydrogen by heating the liquid hydrogen using the cooling water flowing in the cooling water pipe and the oil flowing in the oil pipe as heat sources. As will be described later, there are times when no oil flows through the oil pipe that passes through the vaporizer 13. Therefore, the vaporizer 13 basically vaporizes the liquid hydrogen using the cooling water in the cooling water pipe as a heat source.

[0012] The vaporizer 13 is cooled by the heat absorption effect when the liquid hydrogen vaporizes. Therefore, when the oil passes through the vaporizer 13, the temperature of the oil decreases due to the heat exchange between the vaporizer 13 and the oil.

[0013] The cooling water piping is a piping that carries cooling water that cools the engine 17. The cooling water piping is composed of a first cooling water piping 301 and a second cooling water piping 302. The first cooling water piping 301 is a cooling water piping that passes the cooling water flowing from the engine 17 through the evaporator 13. The second cooling water piping 302 is a cooling water piping that returns the cooling water that has passed through the evaporator 13 to the engine 17.

[0014] The vaporizer 13 is connected to the regulator 14 by a second hydrogen pipe 102. The hydrogen vaporized by the vaporizer 13 is supplied to the regulator 14 through the second hydrogen pipe 102.

[0015] The regulator 14 reduces the pressure of the supplied hydrogen and adjusts the pressure of the hydrogen to an appropriate pressure for use as fuel. The regulator 14 is connected to the pressure chamber 16 by a third hydrogen pipe 103.

[0016] The pressure chamber 16 stores hydrogen that has been depressurized by the regulator 14. The pressure chamber 16 is connected to the engine 17 by a fourth hydrogen pipe 104. The hydrogen in the pressure chamber 16 is supplied to the engine 17 through the fourth hydrogen pipe 104. The engine 17 generates power for the vehicle by combusting the supplied hydrogen.

[0017] The hydrogen stored in the pressure chamber 16 is injected into the cylinders from an injector of the engine 17 in response to the accelerator operation of the vehicle user. In other words, the amount of fuel supplied varies depending on the accelerator work. By providing the pressure chamber 16, it is possible to suppress sudden changes in hydrogen pressure caused by fluctuations in the amount of fuel supplied.

[0018] In this way, the fuel supply system of the liquid water vehicle vaporizes the liquid hydrogen stored in the tank 11 and supplies it to the engine 17 as fuel. <Configuration of oil temperature control system 10> As shown in FIG. 1, the vehicle to which the oil temperature regulation system 10 is applied further includes a transaxle 20. The transaxle 20 transmits the power generated by the engine 17 to the drive shaft. Oil flows inside the transaxle 20. The transaxle 20 uses the lubricating effect of the oil to transmit the power smoothly. In addition, the transaxle 20 generates heat during operation, so it also uses the cooling effect of the oil. The oil temperature regulation system 10 adjusts the temperature of the oil to achieve both the lubricating and cooling effects of the oil.

[0019] As shown in FIG. 1, the oil temperature regulation system 10 includes a heat exchanger 15, a control device 18, an oil temperature sensor 19, an oil pump 21, a control valve 30, and an oil pipe for transporting oil.

[0020] The heat exchanger 15 is installed in the third hydrogen piping 103. In other words, the heat exchanger 15 is installed in the hydrogen piping through which the hydrogen decompressed by the regulator 14 passes before reaching the pressure chamber 16. In addition, an oil piping passes through the heat exchanger 15.

[0021] The heat exchanger 15 exchanges heat between the depressurized hydrogen in the third hydrogen piping 103 and the oil in the oil piping. The temperature of the hydrogen depressurized by the regulator 14 increases due to the Joule-Thomasson effect. Therefore, the temperature of the oil that has passed through the heat exchanger 15 increases as a result of heat exchange with the depressurized hydrogen.

[0022] Oil pump 21 is installed in transaxle 20 and circulates oil in the oil piping. Oil pump 21 directs oil flowing through transaxle 20 in a direction toward regulator valve 30 through first oil piping 201, which will be described later.

[0023] The oil piping is made up of a first oil piping 201, a second oil piping 202, a third oil piping 203, a fourth oil piping 204, and a fifth oil piping 205. The first oil pipe 201 connects the transaxle 20 and the regulator valve 30. The oil flowing through the first oil pipe 201 starts from the transaxle 20 and flows into the regulator valve 30.

[0024] The control valve 30 is connected to the second oil pipe 202 and the fourth oil pipe 204, and adjusts the destination of the oil that has flowed through the first oil pipe 201. The control valve 30 includes a first control valve 31 and a second control valve 32. The first control valve 31 is disposed at a portion of the control valve 30 to which the second oil pipe 202 is connected. The first control valve 31 adjusts the opening degree to adjust the amount of oil that has entered the control valve 30 from the first oil pipe 201 and flows into the second oil pipe 202. The second control valve 32 is disposed at a portion of the control valve 30 to which the fourth oil pipe 204 is connected. The second control valve 32 adjusts the opening degree to adjust the amount of oil that has entered the control valve 30 from the first oil pipe 201 and flows into the fourth oil pipe 204.

[0025] The second oil pipe 202 connects the control valve 30 and the carburetor 13. The third oil pipe 203 connects the carburetor 13 and the transaxle 20. The oil flowing through the second oil pipe 202 starts from the control valve 30 and flows into the carburetor 13. The oil that has passed through the carburetor 13 passes through the third oil pipe 203 and returns to the transaxle 20.

[0026] The fourth oil pipe 204 connects the control valve 30 and the heat exchanger 15. A fifth oil pipe 205 is connected to the heat exchanger 15. The fifth oil pipe 205 is connected to the third oil pipe 203. The oil flowing through the fourth oil pipe 204 starts from the control valve 30 and flows into the heat exchanger 15. The oil that has passed through the heat exchanger 15 passes through the fifth oil pipe 205 and the third oil pipe 203 and returns to the transaxle 20.

[0027] A check valve 22 is provided in the third oil pipe 203 to prevent oil from flowing in the direction from the connection point where the fifth oil pipe 205 is connected to the carburetor 13. In addition, a check valve 22 is provided in the fifth oil pipe 205 to prevent oil from flowing in the direction from the connection point to the heat exchanger 15.

[0028] In the oil temperature regulating system 10, a first oil path and a second oil path are set in the oil piping. The first oil path is a path through which oil starts from the transaxle 20, passes through the first oil pipe 201, the control valve 30, the second oil pipe 202, the carburetor 13, and the third oil pipe 203 in this order, and returns to the transaxle 20. At this time, the check valve 22 of the fifth oil pipe 205 prevents the oil flowing through the first oil path from passing through the heat exchanger 15. As described above, the carburetor 13 is cooled by the heat absorption effect when liquid hydrogen is vaporized, so the temperature of the oil that has passed through the carburetor 13 in the first oil path drops. Therefore, the oil that has passed through the first oil path returns to the transaxle 20 at a lower temperature than when it left the transaxle 20.

[0029] The second oil path is a path in which oil starts from the transaxle 20, passes through the first oil pipe 201, the control valve 30, the fourth oil pipe 204, the heat exchanger 15, the fifth oil pipe 205, and the third oil pipe 203 in this order, and returns to the transaxle 20. At this time, the check valve 22 of the third oil pipe 203 prevents the oil flowing through the second oil path from passing through the carburetor 13. As described above, the heat exchanger 15 exchanges heat between the depressurized hydrogen and the oil, so the temperature of the oil that has passed through the heat exchanger 15 in the second oil path increases. Therefore, the oil that has passed through the second oil path returns to the transaxle 20 at a higher temperature than when it departed from the transaxle 20.

[0030] The control valve 30 adjusts the amount of oil flowing through the first oil path and the amount of oil flowing through the second oil path. The first control valve 31 adjusts the amount of oil flowing through the first oil path by adjusting the amount of oil that has entered the control valve 30 from the first oil piping 201 and flows into the second oil piping 202. The second control valve 32 adjusts the amount of oil flowing through the second oil path by adjusting the amount of oil that has entered the control valve 30 from the first oil piping 201 and flows into the fourth oil piping 204.

[0031] The oil temperature sensor 19 detects the temperature of the oil flowing through the transaxle 20 . The control device 18 is, for example, an ECU connected to the engine 17, and controls the amount of hydrogen injected into the engine 17 and the ignition timing of the air-fuel mixture.

[0032] The control device 18 is also connected to an oil temperature sensor 19 and an adjustment valve 30. The oil temperature sensor 19 constantly transmits oil temperature information to the control device 18 while the vehicle is in operation. The control device 18 receives information on the oil temperature in the transaxle 20 from the oil temperature sensor 19, and controls the adjustment valve 30 based on the received information.

[0033] A first temperature and a second temperature are set in advance for the oil temperature to control the adjustment valve 30 by the control device 18. The first temperature is, for example, the upper limit temperature at which the oil can exert a cooling effect on the transaxle 20. The second temperature is a temperature lower than the first temperature and is, for example, the lower limit temperature at which the oil can exert a lubricating effect on the transaxle 20.

[0034] When the oil temperature is equal to or above the first temperature, the oil cannot effectively perform its cooling function, and therefore it is desirable to lower the oil temperature, whereas when the oil temperature is equal to or below the second temperature, the oil cannot effectively perform its lubricating function, and therefore it is desirable to raise the oil temperature.

[0035] <Processing flow regarding adjustment of oil temperature by opening and closing the valve executed by the control device 18> 2 shows the flow of a series of processes related to oil temperature adjustment by the control device 18. This series of processes is executed when the control device 18 receives information about the oil temperature from the oil temperature sensor 19. The control device 18 adjusts the oil temperature by switching each of the first control valve 31 and the second control valve 32 between an open state and a completely closed state. Hereinafter, opening each valve will be expressed as "open valve" and completely closing each valve will be expressed as "closed valve."

[0036] In the process of step S100, the control device 18 determines whether the oil temperature is equal to or higher than the first temperature. If the control device 18 determines that the oil temperature is equal to or higher than the first temperature (step S100: YES), the process proceeds to step S110.

[0037] In the process of step S110, the control device 18 opens the first control valve 31 and closes the second control valve 32. This opens the first oil path, blocks the second oil path, and causes the oil to pass only through the first oil path. The oil that has passed through the first oil path is cooled by passing through the evaporator 13. Therefore, by circulating the oil in this state, the temperature of the oil drops. After adjusting the openings of the first control valve 31 and the second control valve 32 in the process of step S110, the control device 18 ends this series of processes.

[0038] In the process of step S100, if the control device 18 determines that the oil temperature is lower than the first temperature (step S100: NO), the process proceeds to step S120. In the process of step S120, the control device 18 determines whether the oil temperature is equal to or lower than the second temperature. If the control device 18 determines that the oil temperature is equal to or lower than the second temperature (step S120: YES), the process proceeds to step S130.

[0039] In the process of step S130, the control device 18 closes the first control valve 31 and opens the second control valve 32. This blocks the first oil path and opens the second oil path, so that the oil passes only through the second oil path. The oil that passes through the second oil path is heated by passing through the heat exchanger 15. Therefore, by circulating the oil in this state, the oil temperature increases. After adjusting the openings of the first control valve 31 and the second control valve 32 in the process of step S130, the control device 18 ends this series of processes.

[0040] In the process of step S120, if the control device 18 determines that the oil temperature is higher than the second temperature (step S120: NO), the process proceeds to step S140. That is, if the oil temperature is lower than the first temperature and higher than the second temperature, the process proceeds to step S140. In the process of step S140, the control device 18 closes both the first control valve 31 and the second control valve 32. This blocks both the first oil path and the second oil path. At this time, the oil in the transaxle 20 does not pass through the first oil path and the second oil path. Therefore, it is possible to prevent a change in the temperature of the oil in the transaxle 20 due to the cooling in the carburetor 13 and the heating in the heat exchanger 15. In the process of step S140, the control device 18 adjusts the opening degree of the first control valve 31 and the second control valve 32 and ends this series of processes.

[0041] In this way, the control device 18 switches the path through which the oil leaving the transaxle 20 flows by switching between the open and closed states of the first control valve 31 and the second control valve 32, thereby regulating the oil temperature.

[0042] <Action of this embodiment> The carburetor 13 is cooled by the heat absorption effect when the liquid hydrogen evaporates. The oil flowing through the first oil path is cooled by passing through the carburetor 13. Meanwhile, the temperature of the hydrogen reduced in pressure by the regulator 14 increases. The oil flowing through the second oil path is heated by exchanging heat with reduced-pressure hydrogen through the heat exchanger 15. Therefore, the oil temperature regulation system 10 can regulate the oil temperature by controlling the regulating valve 30, using the fuel supply system as a heat source and a cold source.

[0043] <Effects of this embodiment> (1) The oil temperature regulation system 10 can provide both cooling and lubricating functions through the oil.

[0044] (2) When the oil temperature is equal to or higher than a first temperature, the control device 18 controls the adjustment valve 30 to open the first oil path and close the second oil path. On the other hand, when the oil temperature is equal to or lower than a second temperature that is lower than the first temperature, the control device 18 controls the adjustment valve 30 to close the first oil path and open the second oil path. By the control device 18 controlling the adjustment valve 30 as described above, when the oil temperature is equal to or higher than the first temperature, the oil passes through the evaporator 13 and is cooled. On the other hand, when the oil temperature is equal to or lower than the second temperature, the oil passes through the heat exchanger 15 and is heated. Therefore, the oil temperature adjustment system 10 can adjust the oil temperature to a certain range that is lower than the first temperature and higher than the second temperature.

[0045] (3) The control device 18 controls the adjustment valve 30 to block both the first oil path and the second oil path when the oil temperature is lower than the first temperature and higher than the second temperature. When the oil temperature is between the first temperature and the second temperature, the oil temperature regulation system 10 prevents the oil from passing through the carburetor 13 and the heat exchanger 15. In this way, the oil temperature regulation system 10 can prevent the oil temperature from changing due to heat exchange with the carburetor 13 and heat exchange in the heat exchanger 15.

[0046] <Example of change> This embodiment can be modified as follows: This embodiment and the following modifications can be combined with each other to the extent that there is no technical contradiction.

[0047] In the above-described oil temperature regulation system 10, while the vehicle is in operation, the oil temperature sensor 19 constantly transmits information about the oil temperature to the control device 18. Alternatively, a configuration may be adopted in which the oil temperature sensor 19 transmits information about the oil temperature to the control device 18 only when the oil temperature measured by the oil temperature sensor 19 becomes equal to or higher than a first temperature or becomes equal to or lower than a second temperature.

[0048] In the oil temperature regulation system 10 employing the embodiment of Fig. 2, the regulation valve 30 regulates the amount of oil flowing through the first oil path and the amount of oil flowing through the second oil path by providing two valves, a first regulation valve 31 and a second regulation valve 32. Alternatively, the regulation valve 30 may employ a form in which the oil path to be communicated is switched or both oil paths are blocked by changing the position of the valve body.

[0049] Although the transaxle 20 is used in the configuration of the oil temperature regulation system 10 described above, any device that requires regulating the temperature of oil can be used as a component of the oil temperature regulation system 10. In other words, the oil temperature regulation system 10 can be used with any device that utilizes the cooling and lubricating effects of oil, not limited to the transaxle 20. In addition to the transaxle 20, examples of devices that utilize the cooling and lubricating effects of oil include the transmission, engine, and inverter. In this case, the oil used in the oil temperature regulation system 10 can be transaxle oil if the device is the transaxle 20, transmission oil if the device is a transmission, engine oil if the device is an engine, and inverter oil if the device is an inverter.

[0050] Thus, in the oil temperature regulation system 10, the device is any one of the transmission, the transaxle 20, the engine 17, and the inverter. The oil temperature regulation system 10 can regulate the temperatures of the transmission oil, the transaxle oil, the engine oil, and the inverter oil.

[0051] In the above-described oil temperature regulation system 10, the control device 18 switches between the open and closed states of the first and second control valves 31 and 32 in the control valve 30, and regulates the temperature of the oil by switching the path through which the oil leaving the transaxle 20 flows. In contrast, the control device 18 may regulate the temperature of the oil by changing the ratio of the amount of oil passing through each path, rather than switching the path through which the oil flows. In this case, the control device 18 regulates the opening degree of each of the first and second control valves 31 and 32, and changes the ratio of the amount of oil passing through the first oil path and the amount of oil passing through the second oil path in the oil piping. By changing the ratio of the amount of oil passing through each path, the control device 18 can regulate the temperature of the oil after the oil passing through the first oil path and the oil passing through the second oil path join together. Hereinafter, the process executed by the control device 18 employing such a temperature regulation mode will be described with reference to FIG. 3.

[0052] 3 shows a flow of a series of processes related to oil temperature adjustment by the control device 18 in such an embodiment. This series of processes is executed when the control device 18 receives information about the oil temperature from the oil temperature sensor 19.

[0053] In the process of step S200, the control device 18 determines whether the oil temperature is equal to or higher than the first temperature. If the control device 18 determines that the oil temperature is equal to or higher than the first temperature (step S200: YES), the process proceeds to step S210.

[0054] In the process of step S210, the control device 18 increases the opening degree of the first control valve 31 and decreases the opening degree of the second control valve 32. This increases the amount of oil flowing through the first oil path and decreases the amount of oil flowing through the second oil path. At this time, the ratio of the amount of oil flowing through the first oil path to the total flow rate, which is the sum of the amounts of oil flowing through the first oil path and the second oil path, increases, making it easier for the temperature of the entire oil to decrease. After adjusting the opening degrees of the first control valve 31 and the second control valve 32 in the process of step S210, the control device 18 ends this series of processes.

[0055] In the process of step S200, if the control device 18 determines that the oil temperature is lower than the first temperature (step S200: NO), the process proceeds to step S220. In the process of step S220, the control device 18 determines whether the oil temperature is equal to or lower than the second temperature. If the control device 18 determines that the oil temperature is equal to or lower than the second temperature (step S220: YES), the process proceeds to step S230.

[0056] In the process of step S230, the control device 18 reduces the opening of the first control valve 31 and increases the opening of the second control valve 32. This reduces the amount of oil flowing through the first oil path and increases the amount of oil flowing through the second oil path. At this time, the proportion of the amount of oil flowing through the second oil path in the total flow rate increases, making it easier for the temperature of the entire oil to rise. After adjusting the openings of the first control valve 31 and the second control valve 32 in the process of step S230, the control device 18 ends this series of processes.

[0057] In the process of step S220, when the control device 18 determines that the oil temperature is higher than the second temperature (step S220: NO), the process proceeds to step S240. That is, when the oil temperature is lower than the first temperature and higher than the second temperature, the process proceeds to step S240. In the process of step S240, the control device 18 adjusts the first control valve 31 and the second control valve to a predetermined opening degree set in advance. The predetermined opening degree is the opening degree of the first control valve 31 and the second control valve 32 when the amount of oil passing through each path is adjusted so that the temperature change of the oil caused by the carburetor 13 and the temperature change of the oil caused by the heat exchanger 15 can be canceled when the oil that has passed through each path is joined. The control device 18 can prevent the temperature change of the oil in the transaxle 20 caused by the carburetor 13 and the heat exchanger 15 by adjusting the opening degree of the first control valve 31 and the second control valve 32 to the predetermined opening degree. After adjusting the opening degrees of the first control valve 31 and the second control valve 32 in the process of step S240, the controller 18 ends this series of processes.

[0058] In this way, the adjustment valve 30 is configured to be able to change the ratio of the amount of oil flowing through the first oil path and the amount of oil flowing through the second oil path in the total flow rate, which is the sum of the amounts of oil flowing through the first oil path and the second oil path. When the oil temperature is equal to or higher than the first temperature, the control device 18 controls the adjustment valve 30 so as to increase the ratio of the amount of oil flowing through the first oil path in the total flow rate compared to when the oil temperature is lower than the first temperature. On the other hand, when the oil temperature is equal to or lower than the second temperature that is lower than the first temperature, the control device 18 controls the adjustment valve 30 so as to increase the ratio of the amount of oil flowing through the second oil path in the total flow rate compared to when the oil temperature is higher than the second temperature. By the control device 18 controlling the adjustment valve 30 as described above, when the oil temperature is equal to or higher than the first temperature, the ratio of oil that is cooled by passing through the carburetor 13 increases, and the oil temperature is more likely to decrease. On the other hand, when the oil temperature is equal to or lower than the second temperature, the ratio of oil that is heated by passing through the heat exchanger 15 increases, and the oil temperature is more likely to increase. Therefore, the oil temperature adjustment system 10 can adjust the oil temperature. [Explanation of symbols]

[0059] 10...oil temperature control system, 11...tank, 12...tank pump, 13...carburetor, 14...regulator, 15...heat exchanger, 16...pressure chamber, 17...engine, 18...control device, 19...oil temperature sensor, 20...transaxle, 21...oil pump, 22...check valve, 30...control valve, 31...first control valve, 32...second control valve, 101...first hydrogen pipe, 102...second hydrogen pipe, 103...third hydrogen pipe, 104...fourth hydrogen pipe, 201...first oil pipe, 202...second oil pipe, 203...third oil pipe, 204...fourth oil pipe, 205...fifth oil pipe, 301...first cooling water pipe, 302...second cooling water pipe

Claims

1. An oil temperature control system applied to a vehicle equipped with a fuel supply system that vaporizes liquid hydrogen stored in a tank and supplies the vaporized hydrogen to the engine as fuel, Equipment that utilizes the cooling and lubricating effects of oil; A vaporizer for vaporizing liquid hydrogen; a regulator that reduces the pressure of vaporized hydrogen and supplies it to the engine; a heat exchanger for exchanging heat between the hydrogen decompressed by the regulator and the oil; a first oil path that is a path installed so that the oil flowing from the equipment passes through the evaporator and returns to the equipment without passing through the heat exchanger; a second oil path that is a path installed so that the oil flowing from the equipment passes through the heat exchanger and returns to the equipment without passing through the evaporator; an adjustment valve for adjusting the amount of the oil flowing through the first oil path and the amount of the oil flowing through the second oil path; A control device for controlling the regulator valve, The control device, controlling the regulator valve so as to increase an amount of the oil flowing through the first oil path and decrease an amount of the oil flowing through the second oil path when lowering a temperature of the oil; and controlling the regulator valve so as to increase the amount of the oil flowing through the second oil path and decrease the amount of the oil flowing through the first oil path when increasing the temperature of the oil. Oil temperature control system.

2. The device is any one of a transmission, a transaxle, the engine, and an inverter. The oil temperature regulating system of claim 1 .

3. The control device, controlling the regulator valve to open the first oil path and block the second oil path when the temperature of the oil is equal to or higher than a first temperature; and controlling the regulator valve so as to block the first oil path and open the second oil path when the temperature of the oil is equal to or lower than a second temperature that is lower than the first temperature. The oil temperature regulating system according to claim 1 or 2.

4. The control device, When the temperature of the oil is lower than the first temperature and higher than the second temperature, the regulator valve is controlled to block both the first oil path and the second oil path. The oil temperature regulating system according to claim 3 .

5. the adjustment valve is configured to change a ratio of an amount of the oil flowing through the first oil path and an amount of the oil flowing through the second oil path in a total flow rate that is a sum of an amount of the oil flowing through the first oil path and an amount of the oil flowing through the second oil path, The control device, controlling the adjustment valve so as to increase a proportion of the amount of the oil flowing through the first oil path in the total flow rate when the temperature of the oil is equal to or higher than a first temperature, compared to when the temperature of the oil is lower than the first temperature; and controlling the regulator valve so as to increase a proportion of the amount of the oil flowing through the second oil path in the total flow rate when the temperature of the oil is equal to or lower than a second temperature that is lower than the first temperature, compared to when the temperature of the oil is higher than the second temperature. The oil temperature regulating system according to claim 1 or 2.

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