WO2011089705A1 - Dispositif de refroidissement pour véhicule - Google Patents

Dispositif de refroidissement pour véhicule Download PDF

Info

Publication number
WO2011089705A1
WO2011089705A1 PCT/JP2010/050771 JP2010050771W WO2011089705A1 WO 2011089705 A1 WO2011089705 A1 WO 2011089705A1 JP 2010050771 W JP2010050771 W JP 2010050771W WO 2011089705 A1 WO2011089705 A1 WO 2011089705A1
Authority
WO
WIPO (PCT)
Prior art keywords
heating
cooling water
engine
valve
temperature
Prior art date
Application number
PCT/JP2010/050771
Other languages
English (en)
Japanese (ja)
Inventor
治 新谷
茂樹 木野村
太郎 古越
篤史 駒田
Original Assignee
トヨタ自動車 株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by トヨタ自動車 株式会社 filed Critical トヨタ自動車 株式会社
Priority to PCT/JP2010/050771 priority Critical patent/WO2011089705A1/fr
Publication of WO2011089705A1 publication Critical patent/WO2011089705A1/fr

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
    • F01P7/00—Controlling of coolant flow
    • F01P7/14—Controlling of coolant flow the coolant being liquid
    • F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
    • F01P7/167—Controlling of coolant flow the coolant being liquid by thermostatic control by adjusting the pre-set temperature according to engine parameters, e.g. engine load, engine speed

Definitions

  • the present invention relates to a vehicle cooling device.
  • a cooling water circuit in which cooling water circulates through the inside of the engine by driving a pump is provided, and a valve body is opened and closed according to the temperature of the cooling water downstream of the engine of the cooling water circuit.
  • a thermostat for prohibiting or allowing passage of cooling water inside the engine.
  • the temperature of the cooling water in the cooling water circuit is low, such as immediately after starting the engine from a cold state, the temperature of the thermo element is also low and the valve body of the thermostat is closed, thereby warming up the engine.
  • the machine is promoted.
  • the valve body of the thermostat is closed and passage of cooling water inside the engine is prohibited.
  • a situation occurs in which only the temperature of the cooling water rises and the temperature of the cooling water around the thermoelement does not rise. Under such circumstances, the cooling water staying in the cylinder head of the engine receives heat from the combustion chamber, so that the temperature of the cooling water rises excessively and the cooling water may boil. .
  • a thermostat is provided with a heating element for heating the thermoelement, and the thermoelement is heated by the heating element, so that the temperature of the cooling water around the thermoelement is increased.
  • the valve element can be opened even when the value is low.
  • the valve element is heated by heating the thermo element with the heating element of the thermostat. Is opened.
  • JP 2008-231942 (paragraph [0042], FIG. 6) JP 2003-328753 A (paragraph [0031])
  • the present invention has been made in view of such a situation, and an object of the present invention is to provide a thermostat valve element that opens and closes to prohibit or allow the passage of cooling water inside the engine by heating the thermoelement with a heating element.
  • An object of the present invention is to provide a cooling device for a vehicle, which can quickly open the valve body after receiving an instruction to open the valve body.
  • a vehicle cooling apparatus includes a cooling water circuit that circulates cooling water through the inside of an engine by driving a pump, and a thermostat provided downstream of the engine in the cooling water circuit. Prepare. The thermostat closes the valve body when the temperature of the cooling water is low and prohibits the cooling water from passing through the engine. When the temperature of the cooling water is high, the thermostat receives a heat transfer from the cooling water. The valve body is opened by the element to allow the coolant to pass through the engine.
  • the cooling device is configured to increase the temperature of the thermo element while maintaining the closed state when the valve element is closed, and the heating element that can heat the thermo element to open the valve element. A controller that causes the heating element to heat the thermo element.
  • thermo element When the temperature of the cooling water in the cooling water circuit and the temperature of the thermo element are low and the valve body of the thermostat is closed, heat is generated so that the temperature of the thermo element rises while maintaining the valve body closed.
  • the thermo element is heated by the body. Therefore, when the thermoelement is heated by the heating element to open the valve body based on the valve opening request (valve opening instruction) of the thermostat, the temperature of the thermoelement quickly opens the valve element.
  • the valve rises to a valveable value, and the valve body is thereby opened. Therefore, when the valve body of the thermostat in the valve closing state is opened by heating the thermo element with the heating element, the valve body can be opened quickly after receiving the instruction.
  • the control unit performs heating of the thermo element in a state in which the valve body is kept closed when the valve body is closed after the start of the vehicle start, and in the valve open state after the start of the vehicle start. It is preferable that this is also performed when a valve closing request is made.
  • a valve opening request opening instruction
  • the valve body in the open state is further closed based on the valve closing request for the valve body.
  • control unit alternately performs heating of the thermo element by the heating element and stop of the heating, and adjusts at least one of a heating time for performing the heating and a heating stop time for stopping the heating.
  • a heating time for performing the heating it is preferable to heat the thermo element so that the temperature of the thermo element rises while maintaining the valve closed state of the valve body.
  • the length of the heating time or the heating stop time is adjusted based on parameters corresponding to the temperature of the cooling water downstream of the engine of the cooling water circuit and the heat generation amount of the engine.
  • the control unit opens the valve body by heating the thermo element with the heating element based on the valve opening request of the valve body, and then stops heating the thermo element with the heating element. And alternately. And based on the parameter corresponding to the temperature of the cooling water downstream of the engine of the cooling water circuit and the heat generation amount of the engine, the heating time for heating the thermoelement by the heating element and the heating stop time for stopping the heating By adjusting the length of at least one of these, the opening degree after the opening operation of the valve body is adjusted.
  • the opening degree of the valve element can be adjusted to an intermediate opening degree between the closed valve and the fully opened valve.
  • the valve body When opening the valve body that is in a closed state while the engine is warming up, if the opening degree of the valve body is adjusted to the intermediate opening degree as described above after the opening operation of the valve body, the valve body As a result of the opening operation, the flow rate of the cooling water when the cooling water passes through the engine is not excessively increased. For this reason, it is possible to prevent the temperature of the cooling water inside the engine from drastically decreasing due to the excessive increase in the flow rate of the cooling water, and to delay the engine warm-up. Therefore, it is possible to suppress an increase in fuel consumption.
  • the controller controls the heating element when the temperature of the cooling water downstream from the engine of the cooling water circuit is a value at which the valve element can be opened by the thermo element. Prohibit heating of the thermo element. For this reason, when the temperature of the thermo element becomes a value that can open the valve body due to the transfer of heat from the cooling water of the cooling water circuit to the thermo element, It can be suppressed that heating is performed wastefully and that the temperature of the thermo element is excessively increased due to the heating and causes a malfunction of the thermostat.
  • (A) And (b) is the schematic which shows the structure of the thermostat of the said cooling device.
  • the time chart which shows the change of the temperature of a thermo element with time progress from the starting start time of a vehicle.
  • the time chart which shows the change of the temperature of a thermo element with time progress from the starting start time of a vehicle.
  • the time chart which shows the change of the temperature of a thermo element with time progress from the starting start time of a vehicle.
  • the time chart which shows the change of the temperature of a thermo element with the passage of time after a thermostat opens by valve-opening processing.
  • the flowchart which shows the execution procedure of the pre-heat processing performed through the said cooling device, a valve opening process, and a valve closing process.
  • FIG. 1 shows a configuration of a cooling water circuit of a vehicle cooling device of the present embodiment.
  • This cooling device includes a first cooling water circuit that circulates cooling water through the inside of the engine 1 and a second cooling water that circulates cooling water through the exhaust heat recovery unit 2 without passing through the inside of the engine 1. Circuit.
  • the cooling water in these cooling water circuits can be circulated by the same water pump 3.
  • the water pump 3 is an electric pump, and the flow rate of cooling water discharged (hereinafter referred to as a discharge flow rate) is variable based on a command from the outside.
  • the cooling water discharged from the water pump 3 passes through the exhaust heat recovery device 2, the heater core 6, and the temperature sensing valve 5, and the water pump.
  • the exhaust heat recovery device 2 of the second cooling water circuit functions as a heat exchanger that performs heat exchange between the exhaust gas of the engine 1 and the cooling water of the second cooling water circuit, and heats the cooling water with the heat of the exhaust gas.
  • the heater core 6 functions as a heat exchanger that warms the air blown into the passenger compartment through heat exchange between air and cooling water.
  • the temperature sensing valve 5 positioned downstream of the heater core 6 is formed so as to always allow the coolant to flow after passing through the heater core 6.
  • the first cooling water circuit that circulates the cooling water through the inside of the engine 1 is branched into a main path that passes through the water pump 3, the engine 1, and the radiator 4 and a bypass path that bypasses the radiator 4. Yes.
  • a thermostat 7 is provided at a branch portion between the main path and the bypass path in the first cooling water circuit.
  • the radiator 4 provided in the main path of the first cooling water circuit is for radiating the heat of the cooling water in the first cooling water circuit to the outside air.
  • the coolant discharged from the water pump 3 passes through the engine 1, the thermostat 7, the radiator 4, and the temperature sensing valve 5 and then returns to the water pump 3.
  • the thermostat 7 is formed so as to always permit the flow of cooling water to the radiator 4 side after passing through the engine 1.
  • the temperature sensing valve 5 is opened when the temperature of the cooling water after passing through the heater core 6 becomes a specified value (for example, 105 ° C.) or more, and allows the cooling water to circulate through the radiator 4.
  • the temperature sensing valve 5 is closed when the temperature after passing through the heater core 6 is less than the specified value, and prohibits the circulation of the cooling water through the radiator 4. That is, in this vehicle cooling device, the radiator 4 radiates the heat of the cooling water that has passed through the inside of the engine 1 when the temperature of the cooling water flowing into the temperature sensing valve 5 exceeds a specified value. Activated.
  • the cooling water discharged from the water pump 3 returns to the water pump 3 through the engine 1, the thermostat 7, the heater core 6, and the temperature sensing valve 5. Yes.
  • This bypass path joins the second cooling water circuit downstream of the exhaust heat recovery unit 2 and upstream of the heater core 6.
  • the thermostat 7 prohibits the circulation of the cooling water through the bypass path of the first cooling water circuit according to the valve closing, and cools the cooling water of the first cooling water circuit and the second cooling water circuit according to the valve opening. Mix with water.
  • the thermostat 7 is closed when the temperature of the cooling water in the first cooling water circuit is lower than a determination value (for example, 80 ° C.) for completion of warming up of the engine 1, and when the temperature of the cooling water is equal to or higher than the determination value.
  • the valve opens upon receiving the heat of the cooling water. Further, the thermostat 7 can be forced to open from the closed state when the temperature of the cooling water in the first cooling water circuit is lower than the determination value and is in the closed state. Yes.
  • the temperature of the cooling water passing through the temperature sensing valve 5 is less than the specified value, such as when the vehicle system is started (when the vehicle is started), the temperature sensing valve 5 is closed, and the thermostat 7 is closed.
  • the circulation of the cooling water through the engine 1 in the first cooling water circuit is stopped.
  • the warm-up of the engine 1 is promoted by stopping the passage of the cooling water through the engine 1 in the first cooling water circuit.
  • the thermostat 7 is opened and the inside of the engine 1 in the first cooling water circuit is opened. The cooling water is allowed to pass through and the boiling of the cooling water inside the engine 1 is suppressed.
  • the thermostat 7 has a valve body 22 biased by a spring 21 in the closing direction (right direction in the figure), and resists the valve body 22 against the biasing force of the spring 21. And a thermo element 23 that is opened.
  • the thermo element 23 protrudes or immerses the shaft 24 in association with thermal expansion or thermal contraction of the wax enclosed therein.
  • the thermostat 7 opens or closes the valve element 22 by the protrusion or immersion of the shaft 24 and the biasing force of the spring 21.
  • the shaft 24 is in an immersive state due to heat shrinkage of the wax inside the thermo element 23.
  • the valve body 22 of the thermostat 7 is closed by the biasing force of the spring 21. Since the valve body 22 is closed, the flow of the cooling water in the bypass path of the first cooling water circuit is prohibited, so that the passage of the cooling water inside the engine 1 is also prohibited.
  • the valve body 22 of the thermostat 7 opens against the urging force of the spring 21 to be in the valve open state. At this time, since the circulation of the cooling water in the bypass path of the first cooling water circuit is permitted by opening the valve body 22, the passage of the cooling water inside the engine 1 is also permitted.
  • an element heater 25 is provided as a heating element for heating the thermo element 23 so as to forcibly open the valve element 22 in a closed state where the temperature of the surrounding cooling water is low.
  • the element heater 25 heats the thermo element 23 by generating heat when energized.
  • the vehicle cooling device includes an engine cooling control unit 11 that controls the forced opening operation of the thermostat 7 described above.
  • the engine cooling control unit 11 when controlling the forced opening operation of the thermostat 7 controls the element heater 25 to cause the element heater 25 shown in FIG. 2 to heat the thermoelement 23. Functions as a part.
  • the engine cooling control unit 11 displays a CPU for performing various arithmetic processes related to the cooling control of the engine 1, a ROM in which a control program and data are stored, a CPU calculation result, a sensor detection result, and the like.
  • the electronic control unit includes a RAM that temporarily stores data and an I / O that controls input / output of signals to / from the outside.
  • the engine cooling control unit 11 includes a detection signal from the water temperature sensor 12 for detecting the cooling water temperature thw1 at the outlet of the engine 1 in the first cooling circuit, and a rotation speed sensor 15 for detecting the engine rotation speed. A detection signal and a detection signal from the air flow meter 16 that detects the intake air amount of the engine 1 are input.
  • the vehicle is provided with an air conditioning control unit 13 that controls air conditioning in the passenger compartment, specifically, heating of air in the heater core 6 and control of blowing of the heated air into the passenger compartment.
  • the air conditioning control unit 13 is also configured as an electronic control unit including a CPU, ROM, RAM, and I / O.
  • the air conditioning control unit 13 and the engine cooling control unit 11 are connected to each other through an in-vehicle network (CAN), and share necessary information through mutual communication.
  • CAN in-vehicle network
  • 3 and 4 show the flow of the cooling water in the cooling device after the start of the engine 1 from the cold state and before the warm-up of the engine 1 is completed.
  • both the temperature sensing valve 5 and the thermostat 7 are closed. That is, the temperature sensing valve 5 is closed based on the fact that the temperature of the cooling water circulating in the second cooling water circuit is less than the specified value, and the cooling water temperature thw1 at the outlet of the engine 1 in the first cooling water circuit is The thermostat 7 is closed based on being less than the determination value. Therefore, at this time, as shown in FIG. 3, the circulation of the cooling water in the first cooling water circuit is prohibited, and the cooling water is circulated only in the second cooling water circuit.
  • the cooling water in the first cooling water circuit When the circulation of the cooling water in the first cooling water circuit is prohibited in this way, the cooling water stays in the engine 1 and the temperature of the cooling water is accelerated by the heat generation of the engine 1, so that the engine 1 is warmed up. Is expedited. Further, the cooling water circulating in the second cooling water circuit is heated by the heat recovered from the exhaust in the exhaust heat recovery unit 2. Here, when there is a heating request in the passenger compartment, the air blown into the passenger compartment is warmed by the heat recovered from the exhaust in the exhaust heat recovery device 2.
  • thermoelement 23 is heated by the element heater 25 (FIG. 2A), and the thermostat 7 is opened.
  • the thermostat 7 is closed, based on the cooling water temperature thw1 and the engine operating state, the temperature of the cooling water staying in the engine 1 (cylinder head or the like) is increased to a value that may cause boiling due to heat generated by the engine 1. When it is predicted.
  • the thermostat 7 When it becomes necessary to heat the passenger compartment when the thermostat 7 is closed, and accordingly the temperature of the cooling water passing through the heater core 6 needs to be raised quickly.
  • the cooling water of the first cooling water circuit flows to the upstream side of the heater core 6 of the second cooling water circuit and is mixed with the cooling water of the same circuit, and the cooling in the first cooling water circuit as shown in FIG. 4 or FIG. Water circulation takes place.
  • 4 shows the flow of the cooling water in the cooling device when the thermostat 7 is fully opened
  • FIG. 5 shows the cooling device when the thermostat 7 is adjusted to an intermediate opening degree between the valve closing and the full opening. The flow of the cooling water at is shown.
  • the cooling water of the first cooling water circuit flows into the second cooling water circuit and is mixed with the cooling water of the same circuit, and stays in the engine 1 accordingly.
  • the high temperature cooling water that has been discharged is flowed out of the engine 1.
  • the cooling water of the first cooling water circuit flows into the second cooling water circuit and is mixed with the cooling water of the same circuit as described above.
  • the high-temperature cooling water staying in the engine 1 passes through the heater core 6 of the 2-cooling water circuit. As a result, the air blown into the vehicle interior can be effectively heated with the cooling water of the heater core 6, and as a result, the heating requirement in the vehicle interior can be satisfied.
  • FIG. 6 shows the flow of cooling water in the cooling device after the warm-up of the engine 1 is completed.
  • the temperature sensing valve 5 is opened based on the temperature of the cooling water passing through the temperature sensing valve 5 being equal to or higher than the specified value, and the temperature of the cooling water passing through the thermostat 7 is equal to or higher than the determination value.
  • the thermostat 7 is opened.
  • the cooling water is circulated in the second cooling water circuit, and the cooling water is circulated through the main path of the first cooling water circuit.
  • the thermostat 23 (valve element 22) is opened by heating the thermoelement 23 by the element heater 25 (FIG. 2), so that it stays in the engine 1. This makes it possible to respond to boiling of cooling water and heating requirements in the passenger compartment.
  • the temperature of the cooling water around the thermo-element 23 is low, even if the thermo-element 23 is heated by the element heater 25, the temperature of the thermo-element 23 rises by that and it is long until the valve element is completely opened. take time.
  • the responsiveness is poor with respect to the opening of the thermostat 7 due to the heating of the thermoelement 23 by the element heater 25 (FIG. 2) and the closing of the thermostat 7 due to the heat radiation from the thermoelement 23.
  • the thermo-element 23 is heated by the element heater 25 based on the valve opening request of the thermostat 7 in the situations [1] and [2]
  • the following inconvenience may occur. That is, after the thermostat 7 is requested to open, before the thermostat 7 is actually opened and water is introduced into the engine 1, the cooling water in the engine 1 boils, There may be a delay in raising the temperature of the cooling water passing through the heater core 6 in response to a heating request (corresponding to the valve opening request).
  • the element heater 25 increases the temperature of the thermo element 23 while maintaining the closed state.
  • the thermo element 23 is heated.
  • the element heater 25 is as described above.
  • the thermo element 23 is heated by the above. Therefore, when the thermoelement 23 is heated by the element heater 25 to open the valve body 22 based on the valve opening request (valve opening instruction) of the valve body 22 of the thermostat 7, the temperature of the thermoelement 23 is increased.
  • the valve body 22 is quickly raised to a value at which the valve body 22 can be opened, whereby the valve body 22 is opened. Accordingly, when the valve element 22 of the thermostat 7 in the valve-closed state is opened by heating the thermoelement 23 with the element heater 25, the valve element 22 can be opened quickly after receiving the instruction. .
  • FIGS. 8 and 9 are time charts showing changes in the temperature of the thermo element 23 as time elapses from the start of the vehicle.
  • T1 start of vehicle start
  • T2 time when the thermostat 7 is requested to open
  • T3 the thermoelement 23 during that period
  • the temperature remains at a low value.
  • T2 valve opening of the thermostat 7
  • T3 heating of the thermo element 23 by the element heater 25 is started from that time, but the temperature of the thermo element 23 opens the thermostat 7 (valve element 22). It takes a long time (T2 to T3) to rise to the value BO1 to be valved.
  • the thermostat 7 is closed during the period from the start of the vehicle start (T1) to the time when the thermostat 7 is opened (T2).
  • the thermoelement 23 is heated by the element heater 25 so that the temperature of the thermoelement 23 rises while maintaining the closed state. Heating of the thermo-element 23 during the period from the start of the vehicle start to the time when the valve-opening request is made for the first time, that is, the thermo-element in a state in which there is no history of the valve-opening request after the vehicle starts.
  • the heating of 23 will be implemented as a pre-heat treatment.
  • thermo element 23 In the pre-heat treatment, heating of the thermo element 23 by the element heater 25 and the stop of the heating are alternately performed, and at least one of the heating time t1 for performing the heating and the heating stop time t2 for stopping the heating is long.
  • the temperature of the thermo element 23 is raised while the valve body 22 is kept closed.
  • both the heating time t1 and the heating stop time t2 have the lengths of the engine so as to increase the temperature of the thermo element 23 while maintaining the valve closed state of the valve element 22. It is adjusted based on a parameter related to the cooling water temperature thw1 at one outlet and the heat generation amount of the engine 1. Accordingly, the heating time t1 is lengthened and the heating stop time t2 is shortened as the cooling water temperature thw1 is lowered. Conversely, the heating time t1 is shortened and the heating stop time t2 is lengthened as the cooling water temperature thw1 is raised.
  • the heating time t1 is lengthened and the heating stop time t2 is shortened as the parameter becomes a value on the heat generation amount decrease side of the engine 1, and conversely, the heating time is increased as the parameter becomes a value on the heat generation amount increase side of the engine 1. While t1 is shortened, the heating stop time t2 is lengthened.
  • the parameters include the engine rotational speed detected based on the rotational speed sensor 15 and the engine load calculated as the amount of air taken into the engine 1 per cycle of the engine 1. This engine load is calculated based on the engine rotation speed detected by the rotation speed sensor 15 and the intake air amount of the engine 1 detected by the air flow meter 16.
  • the initial heating time t1 after the start of the vehicle starts becomes relatively long as shown in FIG. 9, and during the heating time t1 Further, the temperature of the thermoelement 23 rises to a value slightly lower than the value BO1 for opening the valve body 22. After that, by repeating the heating stop time t2 and the heating time t1, the temperature of the thermo element 23 falls or rises in the range not exceeding the value BO1 for opening the valve body 22 and in the vicinity of the value BO1. .
  • the valve opening process is performed in detail as follows. That is, based on a valve opening request of the thermostat 7, the element heater 25 heats the thermo element 23 to open the valve element 22 (thermostat 7). Thereafter, the heating of the thermoelement 23 by the element heater 25 and the stop of the heating are alternately performed, and the length of at least one of the heating time t3 for performing the heating and the heating stop time t4 for stopping the heating is adjusted. Thereby, the opening degree adjustment after the valve body 22 (thermostat 7) is opened is performed.
  • the lengths of both the heating time t3 and the heating stop time t4 are the cooling water temperature thw1 at the outlet of the engine 1 and the engine 1 It is adjusted based on the above parameters related to the amount of heat generated.
  • the lower the cooling water temperature thw1 the longer the heating time t3 and the shorter the heating stop time t4.
  • the higher the cooling water temperature thw1 the shorter the heating time t3 and the longer the heating stop time t4.
  • the heating time t3 is lengthened and the heating stop time t4 is shortened as the parameter becomes a value on the heat generation amount decrease side of the engine 1, and conversely, the heating time is increased as the parameter becomes a value on the heat generation amount increase side of the engine 1.
  • the heating stop time t4 is lengthened.
  • the opening degree of the valve element 22 after the opening operation so that the valve element 22 is fully opened.
  • the first heating time t3 after the opening request of the thermostat 7 becomes relatively long as shown in FIG.
  • the temperature of the thermo element 23 rises to a value slightly lower than the value BO2 that fully opens the valve element 22.
  • the temperature of the thermo-element 23 decreases or rises in a range not exceeding the value BO2 for opening the valve body 22 and in the vicinity of the value BO2. .
  • requirement of the thermostat 7 is adjusted to the state of substantially full opening.
  • Such adjustment to the fully open state of the valve body 22 includes heating the thermoelement 23 by the element heater 25 at the heating time t3 and stopping heating of the thermoelement 23 by the element heater 25 at the heating stop time t4. It is realized by performing alternately. For this reason, when trying to hold the valve element 22 in the fully opened state, the element heater 25 excessively heats the thermo element 23, and the temperature of the thermo element 23 is indicated by a two-dot chain line L1 in FIG. The value BO2 will not rise significantly beyond. Therefore, the thermostat 7 is prevented from being damaged due to an excessive temperature rise of the thermo element 23.
  • thermo element 23 when the valve element 22 is to be held in the fully open state, the thermo element 23 is not sufficiently heated by the thermo element 23, and the temperature of the thermo element 23 decreases as indicated by a two-dot chain line L2 in FIG. I don't want to go. Therefore, it is also possible to suppress a shortage of the flow rate of the cooling water passing through the engine 1 without being able to hold the valve element 22 in the fully open state due to an excessive temperature drop of the thermo element 23.
  • the opening after the opening operation of the valve body 22 in the closed state may be adjusted to an intermediate opening between the valve closing and the full opening.
  • the first heating time t3 after the valve opening request of the thermostat 7 is shorter than the state shown in FIG. Adjustments are made as shown in FIG. Then, during the heating time t3, the temperature of the thermoelement 23 rises to a value that causes the valve element 22 to have the intermediate opening.
  • the temperature of the thermo element 23 decreases or increases in the vicinity of a value that causes the valve element 22 to have the intermediate opening degree.
  • requirement of the thermostat 7 is adjusted so that it may become the said intermediate opening degree.
  • the opening degree of the valve body 22 is set as described above after the valve body 22 is opened. If the opening is adjusted to an intermediate opening, the flow rate of the cooling water when the cooling water passes through the engine 1 by the opening operation of the valve body 22 does not excessively increase. For this reason, it can suppress that the temperature of the cooling water inside the engine 1 suddenly decreases due to an excessive increase in the flow rate of the cooling water and delays the warm-up of the engine 1, and the warming is increased by the delay. It can suppress that the fuel consumption for a machine increases.
  • FIG. 11 is a time chart showing a change in temperature of the thermo element 23 over time after the thermostat 7 is opened by the valve opening process.
  • the valve closing process is performed as follows in detail. That is, based on the valve closing request of the thermostat 7, heating of the thermo element 23 by the element heater 25 is stopped and the valve body 22 (thermostat 7) is closed (T6). Thereafter, heating of the thermo-element 23 by the element heater 25 and stop of the heating are alternately performed, and the length of at least one of the heating time t5 for performing the heating and the heating stop time t6 for stopping the heating is adjusted. Thus, the temperature of the thermo element 23 is maintained at a value lower than the value BO1 and in the vicinity of the same value BO1 while maintaining the valve closed state of the thermostat 7.
  • thermoelement 23 is heated by the element heater 25 so as to raise the temperature of the thermoelement 23 as much as possible while maintaining the valve closed state of the thermostat 7.
  • heating of the thermo element 23 by the element heater 25 in such valve closing processing is performed in a state where there is a history of valve opening requests after the start of the vehicle.
  • the length of both the heating time t5 and the heating stop time t6 is the cooling water temperature thw1 at the engine 1 outlet.
  • the above parameters related to the heat generation amount of the engine 1 are adjusted.
  • the lower the coolant temperature thw1 the longer the heating time t5 and the shorter the heating stop time t6.
  • the higher the coolant temperature thw1 the shorter the heating time t5 and the longer the heating stop time t6.
  • the heating time t5 is lengthened and the heating stop time t6 is shortened as the parameter becomes a value on the heat generation amount decrease side of the engine 1, and conversely, the heating time is increased as the parameter becomes a value on the heat generation amount increase side of the engine 1. While t5 is shortened, the heating stop time t6 is lengthened.
  • the element heater control routine is periodically executed through the engine cooling control unit 11 by, for example, a time interruption every predetermined time.
  • the valve body 22 is opened at least once by the opening of the thermostat 7 and the heating of the thermoelement 23 by the element heater 25 based on the opening request after starting the vehicle. In this case as well, the process proceeds to S104.
  • S104 it is determined whether or not there is a request for opening the thermostat 7 (S104). If the determination is affirmative, the valve opening process is executed (S105). Regarding this valve opening process, a state in which the temperature of the thermo-element 23 is adjusted within the range not exceeding the value BO1 for opening the valve element 22 and in the vicinity of the value BO1 by the pre-heat treatment or the valve closing process. Is executed.
  • thermoelement 23 is heated by the element heater 25 to open the valve element 22 (thermostat 7). Thereafter, the heating of the thermo element 23 by the element heater 25 and the stop of the heating are alternately performed, and the valve element 22 is adjusted through length adjustment between the heating time t3 for performing the heating and the heating stop time t4 for stopping the heating.
  • the opening is adjusted after the valve is opened. More specifically, the temperature of the thermo element 23 is adjusted to a value within the range from the value BO1 to the value BO2.
  • valve closing process is executed (S107). This valve closing process is executed in a state where the temperature of the thermo-element 23 is adjusted to a value within the range from the value BO1 to the value BO2 by the valve opening process. In the valve closing process, first, heating of the thermo element 23 by the element heater 25 is stopped, and the valve element 22 (thermostat 7) is closed.
  • thermo-element 23 is maintained at a value lower than the value BO1 and in the vicinity of the same value BO1.
  • the thermoelement 23 is heated by the element heater 25 so as to raise the temperature of the thermoelement 23 as much as possible while maintaining the valve closed state of the thermostat 7.
  • thermoelement 23 is heated by the element heater 25. That is, when the valve element 22 is closed after the start of the vehicle, or when the valve element 22 is requested to open in the open state after the start of the vehicle, the valve element 22 is closed based on the request. At this time, the thermo element 23 is heated in a state in which the valve body 22 is kept closed.
  • heating of the thermo element 23 by the element heater 25 and stopping of the heating are alternately performed, and heating times t1 and t5 for performing the heating and heating stop times t2 and t6 for stopping the heating are performed. It is realized by adjusting the length. The lengths of the heating times t1 and t5 and the heating stop times t2 and t6 are adjusted based on the cooling water temperature thw1 at the outlet of the engine 1 and a parameter corresponding to the heat generation amount of the engine 1.
  • valve body 22 when the valve body 22 is closed after the start of the vehicle or when the valve body 22 is requested to open in the open state after the start of the vehicle, the valve body 22 is closed based on the request.
  • a valve opening request valve opening instruction
  • the thermoelement 23 is heated by the element heater 25 for opening the valve body 22.
  • the temperature of the thermo element 23 quickly rises to the value BO1 at which the valve body 22 can be opened, thereby opening the valve body 22. Therefore, when there is a valve opening request (opening instruction) for the valve body 22 that is in the closed state after the start of the vehicle, the valve body 22 that is in the open state is further based on the valve closing request for the valve body 22.
  • the valve body 22 can be opened quickly after the instruction is received.
  • valve element 22 When the valve element 22 is opened by heating the thermoelement 23 by the element heater 25 based on the valve opening request of the valve element 22 in the thermostat 7, the valve element 22 is opened by the heating, and thereafter Further, heating of the thermo element 23 by the element heater 25 and stopping of the heating are alternately performed. And based on the parameter corresponding to the cooling water temperature thw1 at the outlet of the engine 1 and the heat generation amount of the engine 1, the length of the heating time t3 for heating the thermoelement 23 by the element heater 25 and the heating stop time t4 for stopping the heating By adjusting the opening degree, the opening degree after the opening operation of the valve body 22 is adjusted.
  • the opening degree of the valve element 22 may be adjusted to an intermediate opening degree between the valve closing and the full opening.
  • the opening degree of the valve element 22 is adjusted to the intermediate opening degree as described above after the opening operation of the valve element 22.
  • the flow rate of the cooling water when the cooling water passes through the engine 1 by the opening operation of the valve body 22 is not excessively increased. For this reason, it can suppress that the temperature of the cooling water inside the engine 1 suddenly decreases due to an excessive increase in the flow rate of the cooling water and delays the warm-up of the engine 1, and the warming is increased by the delay. It can suppress that the fuel consumption for a machine increases.
  • thermo element by the element heater 25 When the cooling water temperature thw1 at the outlet of the engine 1 is equal to or higher than the determination value and the temperature of the thermo element 23 that receives heat from the cooling water in the first cooling water circuit is equal to or higher than the value BO1, the thermo element by the element heater 25 In a state where the heating of 23 is stopped, the valve element 22 is opened by the thermo element 23. At this time, heating of the thermo element 23 by the element heater 25 is prohibited. Therefore, when the temperature of the thermoelement 23 is equal to or higher than the value BO1 due to the transfer of heat from the coolant in the first coolant circuit to the thermoelement 23, the element heater 25 heats the thermoelement 23 wastefully. It is possible to suppress the temperature of the thermoelement 23 from being excessively increased due to the heating and the same heating and causing the thermostat 7 to fail.
  • the vehicle to which the present invention is applied may be either a vehicle that runs only by the engine 1 or a hybrid vehicle that runs by at least one of the engine 1 and the motor. Note that, when the vehicle system is started in the present embodiment (when the vehicle is started), power is supplied to various devices necessary for traveling the vehicle, and the engine can be started and the motor of the vehicle can be operated. It is a state of being.
  • an EGR cooler may be provided on the upstream side of the heater core 6 in the second cooling water circuit.
  • Such an EGR cooler is for cooling the EGR gas with the cooling water of the second cooling water circuit, and during the cooling, heat exchange between the heat of the exhaust gas of the engine 1 and the cooling water of the second cooling water circuit is performed. It functions as a heat exchanger that heats the cooling water with the heat of the exhaust gas.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Temperature-Responsive Valves (AREA)

Abstract

L'invention concerne un thermostat (7) qui empêche et permet le passage d'un fluide de refroidissement dans un premier circuit de refroidissement traversant l'intérieur d'un moteur thermique (1), et qui comprend un corps de soupape sollicité par un ressort dans un sens qui tend à fermer le corps de soupape et un thermo-élément qui ouvre le corps de soupape en s'opposant à la force de sollicitation du ressort. Le thermo-élément déploie ou rétracte un axe par expansion thermique ou contraction thermique de cire enfermée à l'intérieur de celui-ci. De plus, le thermostat (7) est muni d'un élément chauffant qui chauffe le thermo-élément. Lorsque la température du thermo-élément est basse, le corps de soupape du thermostat (7) étant fermé, le thermo-élément est chauffé par l'élément chauffant de telle sorte que la température du thermo-élément s'élève tandis que le corps de soupape est maintenu fermé. De cette façon, lorsque le thermo-élément est chauffé par l'élément chauffant de telle sorte que le corps de soupape du thermostat (7) soit ouvert sur la base d'une demande d'ouverture du corps de soupape, la température du thermo-élément s'élève jusqu'à une valeur à laquelle le corps de soupape peut être rapidement ouvert.
PCT/JP2010/050771 2010-01-22 2010-01-22 Dispositif de refroidissement pour véhicule WO2011089705A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/JP2010/050771 WO2011089705A1 (fr) 2010-01-22 2010-01-22 Dispositif de refroidissement pour véhicule

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2010/050771 WO2011089705A1 (fr) 2010-01-22 2010-01-22 Dispositif de refroidissement pour véhicule

Publications (1)

Publication Number Publication Date
WO2011089705A1 true WO2011089705A1 (fr) 2011-07-28

Family

ID=44306527

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2010/050771 WO2011089705A1 (fr) 2010-01-22 2010-01-22 Dispositif de refroidissement pour véhicule

Country Status (1)

Country Link
WO (1) WO2011089705A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2506224A (en) * 2012-05-31 2014-03-26 Jaguar Land Rover Ltd Vehicle engine cooling system and fluid flow control device having a valve closure member that opens in the same direction as coolant flow
FR3016398A1 (fr) * 2014-01-15 2015-07-17 Renault Sa Dispositif a thermostat pour systeme de refroidissement de vehicule automobile, systeme de refroidissement equipe d’un tel dispositif a thermostat et procede de commande d’un module de chauffage
WO2015107288A1 (fr) * 2014-01-15 2015-07-23 Renault S.A.S. Dispositif à thermostat pour système de refroidissement de véhicule automobile, système de refroidissement équipé d'un tel dispositif à thermostat et procédé de commande d'un module de chauffage

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5618018A (en) * 1979-07-19 1981-02-20 Nissan Motor Co Ltd Cooling water temperature controller
JPH11287123A (ja) * 1998-04-01 1999-10-19 Nippon Thermostat Kk 内燃機関の冷却制御装置
JP2004137981A (ja) * 2002-10-18 2004-05-13 Nippon Thermostat Co Ltd 電子制御サーモスタットの制御方法
JP2005188327A (ja) * 2003-12-24 2005-07-14 Aisin Seiki Co Ltd 車両冷却装置
JP2008231942A (ja) * 2007-03-16 2008-10-02 Toyota Motor Corp 内燃機関の冷却装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5618018A (en) * 1979-07-19 1981-02-20 Nissan Motor Co Ltd Cooling water temperature controller
JPH11287123A (ja) * 1998-04-01 1999-10-19 Nippon Thermostat Kk 内燃機関の冷却制御装置
JP2004137981A (ja) * 2002-10-18 2004-05-13 Nippon Thermostat Co Ltd 電子制御サーモスタットの制御方法
JP2005188327A (ja) * 2003-12-24 2005-07-14 Aisin Seiki Co Ltd 車両冷却装置
JP2008231942A (ja) * 2007-03-16 2008-10-02 Toyota Motor Corp 内燃機関の冷却装置

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2506224A (en) * 2012-05-31 2014-03-26 Jaguar Land Rover Ltd Vehicle engine cooling system and fluid flow control device having a valve closure member that opens in the same direction as coolant flow
GB2506224B (en) * 2012-05-31 2015-12-16 Jaguar Land Rover Ltd Motor vehicle engine cooling system and method
US9581072B2 (en) 2012-05-31 2017-02-28 Jaguar Land Rover Limited Motor vehicle engine cooling system and method
FR3016398A1 (fr) * 2014-01-15 2015-07-17 Renault Sa Dispositif a thermostat pour systeme de refroidissement de vehicule automobile, systeme de refroidissement equipe d’un tel dispositif a thermostat et procede de commande d’un module de chauffage
WO2015107288A1 (fr) * 2014-01-15 2015-07-23 Renault S.A.S. Dispositif à thermostat pour système de refroidissement de véhicule automobile, système de refroidissement équipé d'un tel dispositif à thermostat et procédé de commande d'un module de chauffage
CN105960513A (zh) * 2014-01-15 2016-09-21 雷诺股份公司 用于机动车辆冷却***的恒温器装置、装配有这种恒温器装置的冷却***以及控制加热模块的方法
JP2017504756A (ja) * 2014-01-15 2017-02-09 ルノー エス．ア．エス． 自動車冷却システム用サーモスタット装置、該サーモスタット装置に適合する冷却システム、および加熱モジュールの制御方法
US10865697B2 (en) 2014-01-15 2020-12-15 Renault S.A.S. Thermostat device for motor vehicle cooling system, cooling system equipped with such a thermostat device and method of controlling a heating module

Similar Documents

Publication Publication Date Title
JP6079766B2 (ja) エンジン冷却システム及びその運転方法
US8573163B2 (en) Cooling device for vehicle
JP4998537B2 (ja) 車両の冷却装置
JP6417315B2 (ja) 車両用内燃機関の冷却装置
WO2016035511A1 (fr) Système de gestion de chaleur pour véhicules
US9850802B2 (en) Coolant control device
JP2011099400A (ja) 車両の冷却装置
JP6096492B2 (ja) エンジンの冷却装置
JP5381815B2 (ja) 車両の制御装置
CN105531455A (zh) 冷却水控制设备
JP2011157035A (ja) ハイブリッド車両の冷却装置
JP2011080450A (ja) 車両の制御装置
WO2011089705A1 (fr) Dispositif de refroidissement pour véhicule
JP4604858B2 (ja) 車両の暖房装置
JP2007170352A (ja) エンジン冷却装置およびこれに使用される電子制御式流量制御弁
JP5609346B2 (ja) 車載内燃機関の冷却装置
CN111434904B (zh) 内燃机的蓄热散热装置
JP7193327B2 (ja) 車両用システムの制御装置
JP2010260443A (ja) 車両の暖房装置
JP2010047100A (ja) 車両の暖房装置
JP2016211482A (ja) エンジンの冷却装置
JP2010163897A (ja) 内燃機関の冷却装置
JP2013024188A (ja) エンジン冷却装置
CN111485989B (zh) 内燃机的冷却水控制装置
JP2015209792A (ja) エンジン冷却制御装置およびエンジン冷却制御方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10843871

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 10843871

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: JP