Oil temperature control 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

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[0001] This invention relates to an oil temperature control system.

Background Art

[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 the heat of cooling water heated by heat exchange with the exhaust gas of the engine.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Vehicles drive by utilizing the cooling and lubricating effects for some oils such as transaxle oil. Such oils cannot effectively exert the cooling effect when the temperature exceeds a certain value, and the viscosity becomes ineffective for exerting the lubricating effect when the temperature is below a certain value.

Means for Solving the Problems

[0005] Hereinafter, the means for solving the above problems and their effects will be described. The oil temperature control 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 control system comprises equipment that utilizes the cooling and lubricating effects of oil, a vaporizer 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 hydrogen reduced in pressure by the regulator and the oil. The oil temperature control system also comprises a first oil path, which is a path set up so that the oil flowing from the equipment passes through the vaporizer and returns to the equipment without passing through the heat exchanger, a second oil path, which is a path set up so that the oil flowing from the equipment passes through the heat exchanger and returns to the equipment without passing through the vaporizer, a control valve that adjusts the amount of oil flowing through the first oil path and the amount of oil flowing through the second oil path, and a control device that controls the control valve. In this oil temperature control system, the control device controls the control valve to increase the amount of oil flowing through the first oil passage and decrease the amount of oil flowing through the second oil passage when lowering the oil temperature. In this oil temperature control system, the control device controls the control valve to increase the amount of oil flowing through the second oil passage and decrease the amount of oil flowing through the first oil passage when raising the oil temperature. [Effects of the Invention]

[0006] The oil temperature control system can achieve both cooling and lubrication effects from the oil. [Brief explanation of the drawing]

[0007] [Figure 1] Figure 1 is a schematic diagram showing the configuration of an oil temperature control system according to one embodiment. [Figure 2] Figure 2 is a flowchart showing the flow of processing related to the adjustment of oil temperature by opening and closing a valve, which is performed by the control device in the oil temperature control system of the embodiment. [Figure 3]Figure 3 is a flowchart showing the flow of the process related to adjusting the oil temperature by adjusting the valve opening degree, which is performed by the control device in the oil temperature control system of the embodiment. [Modes for carrying out the invention]

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

[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. The tank pump 12 draws up liquid hydrogen from tank 11 and supplies it to vaporizer 13. The liquid hydrogen drawn up by the tank pump 12 is supplied to vaporizer 13 through the first hydrogen piping 101.

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

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

[0013] The coolant piping is the piping that carries the coolant to cool the engine 17. The coolant piping consists of a first coolant piping 301 and a second coolant piping 302. The first coolant piping 301 is the coolant piping that passes the coolant flowing from the engine 17 to the carburetor 13. The second coolant piping 302 is the coolant piping that returns the coolant that has passed through the carburetor 13 back 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 hydrogen pressure to a suitable pressure for use as fuel. The regulator 14 is connected to the pressure chamber 16 by the 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 burning the supplied hydrogen.

[0017] The hydrogen stored in the pressure chamber 16 is injected into the cylinders from the injectors of the engine 17 in response to the vehicle user's accelerator operation. In other words, the amount of fuel supplied fluctuates according to the accelerator operation. The presence of the pressure chamber 16 makes it 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 the oil temperature control system 10> As shown in FIG. 1, a vehicle to which the oil temperature control 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 utilizes the lubricating action of the oil to transmit power smoothly. Also, since the transaxle 20 generates heat when operating, it also utilizes the cooling action of the oil. The oil temperature control system 10 adjusts the temperature of the oil in order to balance such lubricating and cooling actions of the oil.

[0019] As shown in FIG. 1, the oil temperature control 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 carrying the oil, which is an oil pipe.

[0020] The heat exchanger 15 is installed in the third hydrogen pipe 103. That is, the heat exchanger 15 is installed in the hydrogen pipe through which the hydrogen depressurized by the regulator 14 reaches the pressure chamber 16. Also, an oil pipe passes through the heat exchanger 15.

[0021] The heat exchanger 15 exchanges heat between the depressurized hydrogen in the third hydrogen pipe 103 and the oil in the oil pipe. The hydrogen depressurized by the regulator 14 increases in temperature due to the Joule-Thomson effect. Therefore, the oil passing through the heat exchanger 15 increases in temperature by exchanging heat with the depressurized hydrogen.

[0022] The oil pump 21 is installed in the transaxle 20 and circulates the oil in the oil pipe. The oil pump 21 causes the oil flowing through the transaxle 20 to flow in a direction toward the control valve 30 through the first oil pipe 201 described later.

[0023] The oil pipe is composed of a first oil pipe 201, a second oil pipe 202, a third oil pipe 203, a fourth oil pipe 204, and a fifth oil pipe 205. The first oil pipe 201 connects the transaxle 20 and the control valve 30. The oil flowing through the first oil pipe 201 starts from the transaxle 20 and flows into the control 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 comprises a first control valve 31 and a second control valve 32. The first control valve 31 is installed at the part of the control valve 30 where the second oil pipe 202 is connected. By adjusting the opening degree of the first control valve 31, the amount of oil that enters the control valve 30 from the first oil pipe 201 flows into the second oil pipe 202. The second control valve 32 is installed at the part of the control valve 30 where the fourth oil pipe 204 is connected. By adjusting the opening degree of the second control valve 32, the amount of oil that enters the control valve 30 from the first oil pipe 201 flows into the fourth oil pipe 204.

[0025] The second oil pipe 202 connects the control valve 30 to the vaporizer 13. The third oil pipe 203 connects the vaporizer 13 to the transaxle 20. The oil flowing through the second oil pipe 202 starts from the control valve 30 and flows into the vaporizer 13. After passing through the vaporizer 13, the oil returns to the transaxle 20 through the third oil pipe 203.

[0026] The fourth oil pipe 204 connects the control valve 30 to the heat exchanger 15. The 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. After passing through the heat exchanger 15, the oil returns to the transaxle 20 through the fifth oil pipe 205 and the third oil pipe 203.

[0027] A check valve 22 is installed in the third oil pipe 203 to prevent oil from flowing toward the vaporizer 13 from the connection point where the fifth oil pipe 205 is connected. Additionally, a check valve 22 is installed in the fifth oil pipe 205 to prevent oil from flowing toward the heat exchanger 15 from the connection point.

[0028] In the oil temperature control system 10, the oil piping is configured with a first oil path and a second oil path. The first oil path is the 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 vaporizer 13, and the third oil pipe 203 in that 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 mentioned above, the vaporizer 13 is cooled by the endothermic effect when liquid hydrogen vaporizes, so the temperature of the oil that has passed through the vaporizer 13 in the first oil path decreases. Therefore, the oil that has passed through the first oil path returns to the transaxle 20 at a lower temperature than when it started from the transaxle 20.

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

[0030] The control valve 30 regulates the amount of oil flowing through the first oil passage and the amount of oil flowing through the second oil passage. The first control valve 31 regulates the amount of oil flowing through the first oil passage by regulating the amount of oil that enters the control valve 30 from the first oil pipe 201 and flows into the second oil pipe 202. The second control valve 32 regulates the amount of oil flowing through the second oil passage by regulating the amount of oil that enters the control valve 30 from the first oil pipe 201 and flows into the fourth oil pipe 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 fuel-air mixture.

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

[0033] For the control of the control valve 30 by the control device 18, a first temperature and a second temperature are set in advance for the oil temperature. 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 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] If the oil temperature is above the first temperature, the oil cannot effectively perform its cooling function, so it is desirable to lower the oil temperature. On the other hand, if the oil temperature is below the second temperature, the oil cannot effectively perform its lubricating function, so it is desirable to raise the oil temperature.

[0035] <Process flow for adjusting oil temperature by opening and closing valves executed by the control device 18> Figure 2 shows the flow of a series of processes related to oil temperature control 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 between the open state and the completely closed state of the first control valve 31 and the second control valve 32, respectively. Hereinafter, opening the valve will be referred to as "opening the valve," and completely closing it will be referred to as "closing the valve."

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

[0037] In step S110, the control device 18 opens the first control valve 31 and closes the second control valve 32. This opens the first oil passage and blocks the second oil passage, so that the oil passes only through the first oil passage. The oil that has passed through the first oil passage is cooled by passing through the vaporizer 13. Therefore, by circulating the oil in this state, the oil temperature decreases. In step S110, the control device 18, which has adjusted the opening of the first control valve 31 and the second control valve 32, terminates this series of operations.

[0038] In 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 step S120, the control device 18 determines that the oil temperature is below the second temperature. If the control device 18 determines that the oil temperature is below the second temperature (step S120: YES), the process proceeds to step S130.

[0039] In 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 flows only through the second oil path. The oil that has passed 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 rises. In step S130, the control device 18, which has adjusted the opening of the first control valve 31 and the second control valve 32, terminates this series of operations.

[0040] In 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. In other words, if the oil temperature is lower than the first temperature and higher than the second temperature, the process proceeds to step S140. In 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 changes in the oil temperature in the transaxle 20 due to cooling in the vaporizer 13 and heating in the heat exchanger 15. In step S140, the control device 18, having adjusted the opening of the first control valve 31 and the second control valve 32, terminates this series of processes.

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

[0042] <Operation of this embodiment> The vaporizer 13 is cooled by the endothermic effect when liquid hydrogen vaporizes. The oil flowing through the first oil passage is cooled as it passes through the vaporizer 13. On the other hand, the hydrogen, which has been depressurized by the regulator 14, rises in temperature. The oil flowing through the second oil passage is heated by exchanging heat with the depressurized hydrogen via the heat exchanger 15. Therefore, the oil temperature control system 10 can adjust the oil temperature by controlling the control valve 30, utilizing the fuel supply system as both a heat source and a cooling source.

[0043] <Effects of this embodiment> (1) The oil temperature control system 10 can achieve both cooling and lubrication effects from the oil.

[0044] (2) The control device 18 controls the control valve 30 to open the first oil passage and shut off the second oil passage when the oil temperature is above the first temperature. On the other hand, the control device 18 controls the control valve 30 to shut off the first oil passage and open the second oil passage when the oil temperature is below the second temperature, which is lower than the first temperature. By controlling the control valve 30 as described above, when the oil temperature is above the first temperature, the oil passes through the vaporizer 13 and is cooled. On the other hand, when the oil temperature is below the second temperature, the oil passes through the heat exchanger 15 and is heated. Therefore, the oil temperature control 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 control valve 30 to shut off 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. The oil temperature control system 10 prevents the oil from passing through the vaporizer 13 and the heat exchanger 15 when the oil temperature is between the first and second temperatures. This prevents the oil temperature from changing due to heat exchange with the vaporizer 13 and heat exchange in the heat exchanger 15.

[0046] <Example of changes> This embodiment can be implemented with the following modifications. This embodiment and the following modifications can be combined with each other to the extent that they do not contradict each other technically.

[0047] In the oil temperature control system 10 described above, the oil temperature sensor 19 continuously transmits oil temperature information to the control device 18 while the vehicle is in operation. Alternatively, the system may be configured to transmit oil temperature information to the control device 18 only when the oil temperature measured by the oil temperature sensor 19 reaches a first temperature or falls below a second temperature.

[0048] In the oil temperature control system 10 adopting the configuration shown in Figure 2, the control valve 30 adjusts the amount of oil flowing through the first oil passage and the amount of oil flowing through the second oil passage by providing two valves, a first control valve 31 and a second control valve 32. Alternatively, the control valve 30 may adopt a configuration that switches the oil passages that are connected or shuts off both oil passages by changing the position of the valve body.

[0049] • In the configuration of the oil temperature control system 10 described above, a transaxle 20 is used, but any device that requires oil temperature control can be used as part of the configuration of the oil temperature control system 10. In other words, the configuration of the oil temperature control system 10 can be used with any device that utilizes the cooling and lubricating effects of oil, not just the transaxle 20. Examples of devices that utilize the cooling and lubricating effects of oil, in addition to the transaxle 20, include transmissions, engines, and inverters. In this case, the oil used in the oil temperature control system 10 can be said to be transaxle oil if the device is a transaxle 20, transmission oil if it is a transmission, engine oil if it is an engine, and inverter oil if it is an inverter.

[0050] Thus, in the oil temperature control system 10, the equipment is one of the following: the transmission, the transaxle 20, the engine 17, or the inverter. The oil temperature control system 10 can adjust the temperatures of the transmission oil, transaxle oil, engine oil, and inverter oil.

[0051] In the oil temperature control system 10 described above, the control device 18 controls the oil temperature by switching the open and closed states of the first control valve 31 and the second control valve 32 in the control valve 30, thereby switching the path through which the oil that has left the transaxle 20 flows. Alternatively, the control device 18 may control the oil temperature by changing the ratio of the amount of oil flowing through each path, rather than switching the path through which the oil flows. In this case, the control device 18 adjusts the opening degree of each valve of the first control valve 31 and the second control valve 32, thereby changing 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 oil piping. By changing the ratio of the amount of oil flowing through each path, the control device 18 can control the temperature of the oil after the oil that has flowed through the first oil path and the oil that has flowed through the second oil path merge. The process executed by the control device 18 employing this method of temperature control will be described below with reference to Figure 3.

[0052] Figure 3 shows the flow of a series of processes related to oil temperature control by the control device 18 in this 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 step S200, the control device 18 determines whether the oil temperature is at or above the first temperature. If the control device 18 determines that the oil temperature is at or above the first temperature (step S200: YES), the process proceeds to step S210.

[0054] In step S210, the control device 18 increases the opening of the first control valve 31 and decreases the opening of the second control valve 32. This increases the amount of oil flowing through the first oil passage and decreases the amount of oil flowing through the second oil passage. At this time, the proportion of the amount of oil flowing through the first oil passage increases in the total flow rate, which is the sum of the amounts of oil flowing through the first and second oil passages, making it easier for the overall oil temperature to decrease. In step S210, the control device 18, having adjusted the openings of the first control valve 31 and the second control valve 32, terminates this series of operations.

[0055] In 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 step S220, the control device 18 determines that the oil temperature is below the second temperature. If the control device 18 determines that the oil temperature is below the second temperature (step S220: YES), the process proceeds to step S230.

[0056] In step S230, the control device 18 decreases 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 passage and increases the amount of oil flowing through the second oil passage. At this time, the proportion of the oil flowing through the second oil passage in the total flow rate increases, making it easier for the overall oil temperature to rise. In step S230, the control device 18, having adjusted the openings of the first control valve 31 and the second control valve 32, terminates this series of operations.

[0057] In step S220, if the control device 18 determines that the oil temperature is higher than the second temperature (step S220: NO), the process proceeds to step S240. In other words, if the oil temperature is lower than the first temperature and higher than the second temperature, the process proceeds to step S240. In step S240, the control device 18 adjusts the first control valve 31 and the second control valve to a predetermined opening. The predetermined opening is the opening 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 due to the vaporizer 13 and the temperature change of the oil due to the heat exchanger 15 cancel each other out when the oil that has passed through each path merges. By adjusting the opening of the first control valve 31 and the second control valve 32 to a predetermined opening, the control device 18 can prevent the temperature change of the oil in the transaxle 20 caused by the vaporizer 13 and the heat exchanger 15. In step S240, the control device 18, which has adjusted the opening degrees of the first control valve 31 and the second control valve 32, terminates this series of operations.

[0058] Thus, the control valve 30 is configured to change the ratio of the amount of oil flowing through the first oil passage to the amount of oil flowing through the second oil passage in the total flow rate, which is the sum of the amounts of oil flowing through the first and second oil passages. When the oil temperature is above the first temperature, the control device 18 controls the control valve 30 to increase the proportion of the amount of oil flowing through the first oil passage in the total flow rate compared to when the oil temperature is below the first temperature. On the other hand, when the oil temperature is below the second temperature (which is lower than the first temperature), the control device 18 controls the control valve 30 to increase the proportion of the amount of oil flowing through the second oil passage in the total flow rate compared to when the oil temperature is above the second temperature. By controlling the control valve 30 as described above, when the oil temperature is above the first temperature, the proportion of oil that passes through the vaporizer 13 and is cooled increases, making it easier for the oil temperature to decrease. On the other hand, when the oil temperature is below the second temperature, the proportion of oil that passes through the heat exchanger 15 and is heated increases, making it easier for the oil temperature to rise. Therefore, the oil temperature control 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 piping, 102…Second hydrogen piping, 103…Third hydrogen piping, 104…Fourth hydrogen piping, 201…First oil piping, 202…Second oil piping, 203…Third oil piping, 204…Fourth oil piping, 205…Fifth oil piping, 301…First coolant piping, 302…Second coolant piping

Claims

1. This is an oil temperature control system applied to vehicles equipped with a fuel supply system that vaporizes liquid hydrogen stored in a tank and supplies it to the engine as fuel. Equipment that utilizes the cooling and lubricating effects of oil, A vaporizer that vaporizes liquid hydrogen, A regulator that reduces the pressure of vaporized hydrogen and supplies it to the engine, A heat exchanger that exchanges heat between hydrogen depressurized by the regulator and the oil, A first oil path is provided, which is a path set up so that the oil flowing from the aforementioned equipment passes through the vaporizer and returns to the equipment without passing through the heat exchanger. A second oil path is provided, which is a path set up so that the oil flowing from the aforementioned equipment passes through the heat exchanger and returns to the equipment without passing through the vaporizer. A control valve for adjusting the amount of oil flowing through the first oil passage and the amount of oil flowing through the second oil passage, A control device for controlling the aforementioned control valve, comprising: The control device, The control valve is controlled to increase the amount of oil flowing through the first oil passage and decrease the amount of oil flowing through the second oil passage when the temperature of the oil is lowered. The control valve is controlled to increase the amount of oil flowing through the second oil passage and decrease the amount of oil flowing through the first oil passage when the temperature of the oil is raised. Oil temperature control system.

2. The aforementioned equipment is any one of the following: the transmission, the transaxle, the engine, or the inverter. The oil temperature control system according to claim 1.

3. The control device, When the oil temperature is above a first temperature, the control valve is controlled to open the first oil passage and block the second oil passage. When the oil temperature is lower than or equal to a second temperature, which is lower than the first temperature, the control valve is controlled to shut off the first oil passage and open the second oil passage. An oil temperature control system according to claim 1 or claim 2.

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

5. The control valve is configured to change the ratio of the amount of oil flowing through the first oil path to 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. The control device, When the oil temperature is above the first temperature, the control valve is controlled to increase the proportion of the amount of oil flowing through the first oil path in the total flow rate compared to when the oil temperature is below the first temperature. When the oil temperature is lower than or equal to the second temperature, which is lower than the first temperature, the control valve is controlled to increase the proportion 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. An oil temperature control system according to claim 1 or claim 2.

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