WO2012117554A1 - 内燃機関の暖機促進装置 - Google Patents
内燃機関の暖機促進装置 Download PDFInfo
- Publication number
- WO2012117554A1 WO2012117554A1 PCT/JP2011/054926 JP2011054926W WO2012117554A1 WO 2012117554 A1 WO2012117554 A1 WO 2012117554A1 JP 2011054926 W JP2011054926 W JP 2011054926W WO 2012117554 A1 WO2012117554 A1 WO 2012117554A1
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- WIPO (PCT)
- Prior art keywords
- cooling water
- internal combustion
- combustion engine
- passage
- pressure
- Prior art date
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Classifications
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- 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
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- 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
- F01P9/00—Cooling having pertinent characteristics not provided for in, or of interest apart from, groups F01P1/00 - F01P7/00
- F01P9/02—Cooling by evaporation, e.g. by spraying water on to cylinders
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- 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
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
- F01P2003/027—Cooling cylinders and cylinder heads in parallel
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- 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
- F01P3/00—Liquid cooling
- F01P3/02—Arrangements for cooling cylinders or cylinder heads
- F01P2003/028—Cooling cylinders and cylinder heads in series
-
- 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
- F01P2037/00—Controlling
- F01P2037/02—Controlling starting
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- 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
- F01P7/162—Controlling of coolant flow the coolant being liquid by thermostatic control by cutting in and out of pumps
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- 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
- F01P7/164—Controlling of coolant flow the coolant being liquid by thermostatic control by varying pump speed
Definitions
- the present invention relates to a warm-up promoting device for an internal combustion engine.
- cooling with cooling water is performed in order to suppress an excessive temperature rise caused by engine operation.
- the cooling water passes through the internal combustion engine by circulating through the circulation path.
- the engine is cooled through heat exchange between the cooling water and the internal combustion engine.
- Patent Document 1 describes that the passage of the cooling water through the internal combustion engine is restricted by stopping a pump that circulates the cooling water. By implementing the restriction on the passage of the cooling water through the internal combustion engine during the warm-up of the engine, the warm-up can be promoted and completed early.
- Patent Literature 1 when the passage of the cooling water through the internal combustion engine is restricted, the temperature of the cooling water detected by the water temperature sensor, the cumulative value of the intake air amount of the internal combustion engine, and the above restriction are performed. It is described that it is determined whether or not the warm-up of the internal combustion engine is completed based on a cumulative value of time or the like. Further, in Patent Document 1, when it is determined that the warm-up of the internal combustion engine is completed, it is determined that the warm-up of the internal combustion engine is complete. Are listed.
- JP 2008-169750 A paragraphs [0040] to [0053] and FIG. 2
- the present invention has been made in view of such circumstances, and its object is to make the engine more effective in promoting warm-up by restricting the passage of cooling water through the internal combustion engine.
- An object of the present invention is to provide a warm-up promoting device for an internal combustion engine.
- the control unit that controls the passage of the cooling water that circulates in the circulation path causes the passage of the cooling water to the internal combustion engine.
- the cooling water inside the engine is nucleate boiling during the restriction, the restriction of the passage of the cooling water through the internal combustion engine is maintained.
- nucleate boiling occurs first as an initial stage of boiling of the cooling water, and then the boiling state of the cooling water shifts from nucleate boiling to film boiling.
- the nucleate boiling is a form of boiling in which bubbles of water vapor are generated with a predetermined foaming point on the heat transfer surface for cooling water as a nucleus.
- the film boiling is a boiling mode in which the temperature of the cooling water rises from the state of nucleate boiling and the water vapor bubbles increase, and the water vapor film is formed on the transmission surface by the air bubbles.
- the boiling form to be avoided so as not to cause an abnormality in the engine is the film boiling.
- the passage of the cooling water through the internal combustion engine is restricted, there is no risk of the engine becoming abnormal due to the nucleate boiling. It is preferable to perform the above limitation in promoting the machine.
- the control unit prevents the cooling water from passing through the internal combustion engine.
- the control unit is in the process of restricting the passage of cooling water through the internal combustion engine, and the maintenance period elapses after nucleate boiling occurs in the cooling water inside the engine. Maintain the limit of cooling water passage through the internal combustion engine during nucleate boiling.
- the maintenance period is set to a period in which the pressure in the circulation path is a value representing the occurrence of the nucleate boiling.
- there is a correlation between the pressure in the circulation path and the nucleate boiling of the cooling water inside the internal combustion engine and the above is maintained during the period when the pressure in the circulation path is a value representing the occurrence of the nucleate boiling.
- the maintenance period may be set to a period in which the temperature of the cooling water inside the internal combustion engine is a value representing the occurrence of the nucleate boiling.
- the maintenance period is determined in a period in which the temperature of the coolant is a value representing the occurrence of the nucleate boiling, By restricting the passage of the cooling water through the internal combustion engine during the maintenance period, it is possible to maintain the restriction of the passage of the cooling water through the internal combustion engine when the nucleate boiling occurs.
- the control unit includes a flow rate control valve for controlling a flow rate of the cooling water passing through the internal combustion engine, and the flow rate control valve is driven to a closed side to drive the cooling water internal combustion engine.
- the passage is restricted.
- the flow control valve is maintained in a state driven to the closed side.
- the control unit is a pressure valve that controls the flow rate of the cooling water passing through the internal combustion engine based on the pressure in the circulation path.
- This pressure valve receives the pressure in the circulation path, and when the pressure is a value representing the occurrence of the nucleate boiling, the pressure valve maintains the driven state on the closed side, thereby restricting the passage of cooling water through the internal combustion engine. To maintain.
- the pressure valve is in the process of restricting the passage of the cooling water through the internal combustion engine, and the nucleate boiling from the time when the nucleate boiling occurs in the cooling water inside the engine until the maintenance period elapses. Maintain the passage restriction of the cooling water internal combustion engine.
- the maintenance period is set to a period in which the pressure in the circulation path is a value representing the occurrence of nucleate boiling by the pressure valve.
- the control unit includes a pump capable of controlling a flow rate of the cooling water passing through the internal combustion engine, and reduces the discharge amount of the cooling water in the pump, thereby allowing the cooling water to pass through the internal combustion engine. It is supposed to be limited. In this case, when the cooling water passing through the internal combustion engine is being restricted and the cooling water inside the engine is boiling nuclei, the discharge amount of the cooling water in the pump is maintained in a reduced state. Thus, the restriction on the passage of the cooling water through the internal combustion engine is maintained. Further, if the pump is also used as a pump for circulating the cooling water in the circulation path, it is not necessary to provide a part for limiting the passage of the cooling water through the internal combustion engine such as a valve. The mountability of the apparatus can be improved.
- the maintenance period is defined as a period from when the nucleate boiling occurs in the cooling water inside the internal combustion engine to when the boiling state of the cooling water switches to film boiling.
- the restriction on the passage of the cooling water through the internal combustion engine is maintained over the entire period in which the cooling water is boiling in the internal combustion engine. Therefore, the limitation can be maintained as long as possible, and the warming-up promotion effect of the internal combustion engine by the limitation can be maximized.
- the control unit includes a first coolant passage that passes through the cylinder head of the internal combustion engine and a second coolant passage that passes through the cylinder block.
- the passage is restricted.
- the cylinder head is likely to rise in temperature due to heat from the combustion gas in the combustion chamber, while the cylinder block is less likely to rise in temperature because it is less susceptible to the heat.
- the control unit by limiting the passage of the cooling water through the cylinder block by the control unit, it is possible to realize an effective warm-up (temperature increase) of the cylinder block that is unlikely to increase in temperature.
- the internal combustion engine 1 shown in FIG. 1 is cooled by cooling water circulating in the circulation path 2. Specifically, when the cooling water circulates through the circulation path 2 and passes through the internal combustion engine 1, heat exchange is performed between the cooling water and the internal combustion engine 1 to cool the internal combustion engine 1.
- the circulation path 2 is provided with a variable capacity pump 3 capable of controlling the flow rate of the cooling water circulating in the path 2. For example, an electric water pump may be used as the pump 3.
- the warm-up promoting device of this embodiment includes an electronic control device 4 that executes various operation controls of the internal combustion engine 1.
- the electronic control unit 4 includes a CPU that executes various arithmetic processes related to the above control, a ROM that stores programs and data necessary for the control, a RAM that temporarily stores CPU calculation results, and the like. It has input / output ports for inputting / outputting signals.
- Various sensors such as a pressure sensor 5 for detecting the pressure (system pressure) P in the circulation path 2 are connected to the input port of the electronic control device 4, and the pump 3 is driven to the output port of the device 4. Drive circuits of various devices such as circuits are connected.
- the pump 3 and the electronic control unit 4 function as a control unit that controls the passage of the cooling water through the internal combustion engine 1.
- the pressure sensor 5 can be provided at any location on the circulation path 2 regardless of the installation location on the circulation path 2. This is because, in the continuous system of the circulation path 2, the pressure rise due to boiling is transmitted to the entire system instantaneously, and therefore, regardless of the installation location (pressure measurement location) of the pressure sensor 5 in the circulation path 2. This is because the pressure can be accurately measured by the pressure sensor 5.
- the electronic control unit 4 passes the cooling water through the engine 1 to complete the warm-up early. Limit. Specifically, the electronic control unit 4 reduces the flow rate of the cooling water passing through the internal combustion engine 1 to “0” by stopping the driving of the pump 3. In this case, since the heat of the internal combustion engine 1 is suppressed from being taken away by the cooling water passing through the engine 1, warming up of the internal combustion engine 1 is promoted. On the other hand, the cooling water existing inside the internal combustion engine 1 gradually increases in temperature upon receiving heat from the engine 1.
- nucleate boiling occurs first as the initial stage of boiling of the cooling water, and then the boiling state of the cooling water shifts from nucleate boiling to film boiling.
- the nucleate boiling is a boiling form in which bubbles of water vapor are generated with a predetermined foaming point on the heat transfer surface on the internal combustion engine 1 side with respect to cooling water as a nucleus.
- the film boiling is a boiling mode in which the temperature of the cooling water rises from the state of nucleate boiling and the water vapor bubbles increase, and the water vapor film is formed on the transmission surface by the air bubbles.
- the boiling form to be avoided so as not to cause an abnormality in the engine 1 is the film boiling.
- the above restriction is preferably performed in order to promote warm-up of the internal combustion engine 1.
- the warm-up promoting device of the present embodiment when the cooling water inside the engine 1 is nucleate boiling while the passage of the cooling water through the internal combustion engine 1 is being restricted. The restriction of the passage of the cooling water through the internal combustion engine 1 is maintained. Thereby, warming-up promotion of the engine 1 by restricting the passage of the cooling water through the internal combustion engine 1 can be made effective.
- timing T1 the cooling water nucleates.
- the cooling water inside the internal combustion engine 1 receives heat from the engine 1, and the boiling state of the cooling water is changed from the nuclear boiling. Transition to film boiling (timing T2).
- the system pressure is as shown in FIG. P (pressure in the circulation path 2) becomes substantially constant, and the temperature of the cooling water inside the internal combustion engine 1 becomes substantially constant as shown in FIG. 2 (b).
- the system pressure P slightly increases while being larger than “0”, and the temperature of the cooling water inside the internal combustion engine 1 also slightly increases.
- the rate of increase of the system pressure P (the slope of the solid line in FIG. 2A) increases rapidly, and the internal combustion engine The rate of increase in the temperature of the cooling water inside the engine 1 (the slope of the solid line in FIG. 2B) also increases rapidly.
- the electronic control unit 4 limits the passage of the cooling water through the internal combustion engine 1 before the cooling water inside the internal combustion engine 1 in the warm-up process nucleates (before T1), and further nucleates the cooling water.
- the passage restriction of the cooling water in the internal combustion engine 1 is maintained even during nucleate boiling after the maintenance period t elapses after the occurrence of. Thereby, warming up of the internal combustion engine 1 is promoted. Further, the electronic control unit 4 releases the restriction on the passage of the cooling water through the internal combustion engine 1 when the maintenance period t elapses after the nuclear boiling of the cooling water inside the internal combustion engine 1 occurs. That is, by starting the driving of the pump 3 in FIG.
- the flow rate of the cooling water passing through the internal combustion engine 1 is increased to a value larger than “0”, for example, a value appropriate for engine operation at that time.
- the maintenance period t is a period in which the system pressure P is a value representing the occurrence of nucleate boiling in the cooling water inside the internal combustion engine 1, more specifically, nucleate boiling occurs in the cooling water.
- the restriction is performed when the system pressure P is less than the determination value Pa shown in FIG.
- the determination value Pa is previously tested so that it becomes a value corresponding to the pressure in the circulation path 2 when the boiling state of the cooling water in the internal combustion engine 1 shifts from nucleate boiling to film boiling (T2). Etc.
- FIG. 3 is a flowchart showing a warm-up routine for restricting passage of the cooling water through the internal combustion engine 1 based on the system pressure P and releasing the restriction.
- This warming-up routine is periodically executed through the electronic control unit 4 by, for example, a time interruption every predetermined time.
- this routine it is first determined whether or not the system pressure P is less than the determination value Pa (S101). If the determination is affirmative, the cooling water inside the internal combustion engine 1 is in a state before film boiling, and therefore the passage of the cooling water through the internal combustion engine 1 is restricted to promote warm-up of the internal combustion engine 1 ( S102). Specifically, when the pump 3 is stopped, the flow rate of the cooling water passing through the internal combustion engine 1 is reduced to “0”.
- the following effects can be obtained. (1)
- the cooling water passing through the internal combustion engine 1 is restricted to promote warm-up of the internal combustion engine 1 and the cooling water inside the engine 1 is nucleate boiling, the cooling is performed.
- the restriction of the passage of water through the internal combustion engine 1 is maintained. Specifically, during the nucleate boiling from the occurrence of nucleate boiling in the cooling water inside the internal combustion engine 1 until the maintenance period t elapses, the restriction on the passage of the cooling water through the internal combustion engine 1 is maintained. Thereby, warming-up promotion of the engine 1 by restricting the passage of the cooling water through the internal combustion engine 1 can be made effective.
- the maintenance period t is defined as a period in which the system pressure P is a value representing the occurrence of the nucleate boiling in the cooling water inside the internal combustion engine 1.
- the maintenance period t is set to a period during which the system pressure P is a value representing the occurrence of the nucleate boiling.
- the maintenance period t determined based on the system pressure P is nucleated. It can be appropriate as a period of occurrence of
- the temperature of the cooling water in the circulation path 2 is detected by the water temperature sensor, and the maintenance period t is determined during the period when the temperature is a value representing the occurrence of nucleate boiling, The maintenance period t may be inappropriate as a period in which nucleate boiling occurs. This is because the temperature of the cooling water in the circulation path 2 varies from place to place in the circulation path 2 while the passage of the cooling water through the internal combustion engine 1 is limited.
- the maintenance period t determined based on the temperature of the cooling water detected by the water temperature sensor becomes inappropriate as a period during which nucleate boiling occurs.
- the maintenance period t is determined in a period in which the system pressure P detected by the pressure sensor 5 is a value indicating the occurrence of nucleate boiling, the above-described problem occurs. Can be avoided.
- the maintenance period t is a period in which the system pressure P is a value representing the occurrence of the nucleate boiling in the cooling water inside the internal combustion engine 1, and is the same after the nucleate boiling occurs in the cooling water. It is determined in a period until the boiling state of the cooling water is switched to film boiling. In this case, the restriction on the passage of the cooling water through the internal combustion engine 1 is maintained over the entire period in which the cooling water is boiling in the internal combustion engine 1. Therefore, the limitation can be maintained as long as possible, and the warming-up promotion effect of the internal combustion engine 1 by the limitation can be maximized.
- the restriction of the passage of the cooling water through the internal combustion engine 1 is performed by setting the flow rate (corresponding to the discharge amount of the pump 3) to “0” through the drive control of the pump 3 capable of controlling the flow rate of the cooling water passing through the internal combustion engine 1. It is realized by reducing to ".” For this reason, when the cooling water passing through the internal combustion engine 1 is being restricted and the cooling water inside the engine 1 is boiling nuclei, maintaining the restriction means that the cooling water in the pump 3 is maintained. This can be realized by maintaining the discharge amount in a state reduced to “0”.
- the pump 3 is also used as a pump for circulating the cooling water in the circulation path 2, it is not necessary to newly provide a part for limiting the passage of the cooling water to the internal combustion engine 1, such as a valve.
- the warm-up promoting device can be reduced in size by the amount that it is not necessary to provide such a component, and the mountability of the device on a vehicle can be improved.
- the downstream portion of the pump 3 in the circulation path 2 branches into a main path 2 a that passes through the internal combustion engine 1 and a bypass path 2 b that bypasses the internal combustion engine 1. Yes.
- the main path 2 a and the bypass path 2 b merge at the downstream side of the internal combustion engine 1 in the circulation path 2. Therefore, the cooling water in the circulation path 2 can be circulated through both the main path 2 a and the bypass path 2 b by driving the pump 3.
- the pump 3 it is not always necessary to employ an electric water pump as in the first embodiment, and a mechanical water pump that is directly driven by the internal combustion engine 1 can also be employed.
- the main path 2a is provided with an electronically controlled flow rate control valve 6 for controlling the flow rate of the cooling water passing through the internal combustion engine 1.
- This flow control valve 6 controls the flow rate of the cooling water passing through the main path 2a (internal combustion engine 1) by adjusting the opening degree through drive control by the electronic control unit 4.
- the flow control valve 6 and the electronic control device 4 function as a control unit that controls the passage of the cooling water through the internal combustion engine 1.
- the cooling passing through the main path 2a according to the opening degree of the flow control valve 6
- the ratio between the flow rate of water and the flow rate of cooling water passing through the bypass path 2b changes.
- the electronic control unit 4 restricts the passage of the cooling water through the internal combustion engine 1 in order to promote warm-up of the internal combustion engine 1. Specifically, the flow rate of the cooling water passing through the internal combustion engine 1 is reduced to “0” by driving the flow rate control valve 6 to the closed side. In this case, the flow control valve 6 is driven to the closed side until it is fully closed. Further, when the system pressure P becomes equal to or higher than the determination value Pa, the electronic control unit 4 releases the restriction on the passage of the cooling water through the internal combustion engine 1 so as to suppress the film boiling of the cooling water inside the internal combustion engine 1. Specifically, by driving the flow rate control valve 6 that has been driven to the closing side to the opening side, the flow rate of the cooling water passing through the internal combustion engine 1 is more than “0”, for example, suitable for engine operation at that time. Increase to the correct value.
- the restriction of the passage of the cooling water through the internal combustion engine 1 is achieved by controlling the flow rate to “0” through drive control (opening control) of the flow rate control valve 6 capable of controlling the flow rate of the cooling water passing through the internal combustion engine 1 This is achieved by reducing the number. For this reason, when the cooling water passing through the internal combustion engine 1 is being restricted and the cooling water inside the engine 1 is nucleate boiling, maintaining the restriction means that the flow control valve 6 is This can be realized by maintaining the state driven to the closed side.
- the circulation path 2 of this embodiment has a first path 2 c that passes through the cylinder head 1 a of the internal combustion engine 1 and a cylinder block 1 b that passes through the cylinder block 1 b of the internal combustion engine 1 on the downstream side of the pump 3. Branches to two paths 2d.
- the first path 2c and the second path 2d merge downstream of the internal combustion engine 1.
- the cylinder head 1 a easily receives a heat from the combustion gas in the combustion chamber and rises in temperature
- the cylinder block 1 b hardly rises in temperature because the heat hardly receives the heat. For this reason, it is desired to promote the warming-up of the cylinder block 1b that is difficult to increase in temperature while cooling the cylinder head 1a that is likely to increase in temperature.
- a pressure valve 7 for controlling the flow rate of the cooling water passing through the cylinder block 1b (second path 2d) is provided in a portion located downstream of the cylinder block 1b in the second path 2d. ing.
- the pressure valve 7 receives the pressure in the circulation path 2 (system pressure P) and is adjusted in opening degree, and the flow rate of cooling water passing through the cylinder block 1b (second path 2d) of the internal combustion engine 1 through the opening degree adjustment. Is to control.
- the pressure valve 7 functions as a control unit that restricts the flow rate of the cooling water passing through the cylinder block 1b by being driven to the closed side.
- the pressure valve 7 when the pressure in the circulation path 2 (system pressure P) is less than the determination value Pa, the pressure valve 7 is driven to the closed side based on the pressure, thereby cooling water passing through the cylinder block 1b. Reduce the flow rate to “0”. In this case, the pressure valve 7 is driven to the closed side until it is fully closed. As a result, the passage of the cooling water through the cylinder block 1b is restricted, and warming up of the cylinder block 1b is promoted. Further, as described above, when the pressure in the circulation path 2 (system pressure P) becomes equal to or higher than the determination value Pa, the pressure valve 7 in the state driven to the closed side is driven to the open side based on the pressure and The restriction
- the pressure valve 7 includes a housing 9 having a pressure chamber 8 communicating with the second path 2d, and a displacement inside the housing 9 so that the volume of the pressure chamber 8 can be changed by the displacement. And a spring 11 that urges the valve body 10 in a direction to reduce the volume of the pressure chamber 8.
- the valve body 10 of the pressure valve 7 reduces the volume of the pressure chamber 8 in the housing 9 by the force based on the pressure in the pressure chamber 8 (system pressure P) connected to the second path 2d and the biasing force of the spring 11. Displacement in the direction or direction of enlargement.
- valve body 10 when the force based on the system pressure P in the pressure chamber 8 is smaller than the biasing force of the spring 11, the valve body 10 reduces the volume of the pressure chamber 8, in other words, in the second path 2 d in the pressure chamber 8.
- the connecting port 8a is displaced in the closing direction.
- the valve body 10 expands the volume of the pressure chamber 8, in other words, releases the port 8 a in the pressure chamber 8. Displace in the direction.
- the position of the valve body 10 with respect to the port 8a (the opening degree of the pressure valve 7) is adjusted based on the magnitude of the system pressure P in the pressure chamber 8, thereby adjusting the flow rate of the cooling water passing through the second path 2d. Is done.
- the valve body 10 closes the port 8a so that the opening degree of the pressure valve 7 is fully closed, and the system pressure P is The biasing force of the spring 11 in the pressure valve 7 is determined so that the opening degree of the pressure valve 7 becomes a value on the open side with respect to the fully closed state by releasing the port 8a when the valve body 10 is equal to or greater than the determination value Pa. It has been.
- the maintenance period t has elapsed since nucleate boiling has occurred in the cooling water in the cylinder block 1b in a state where passage of the cooling water in the cylinder block 1b is restricted.
- the maintenance period t is the same as that in the first embodiment.
- the maintenance period t has passed, the restriction on the passage of the cooling water cylinder block 1b is released as in the first embodiment.
- the following effects can be obtained. (6)
- the cooling water in the first path 2c passes through the cylinder head 1a, so that the cylinder head 1a that is likely to rise in temperature is cooled by the cooling water. can do. Therefore, it is possible to effectively warm up the cylinder block 1b that is unlikely to increase in temperature while cooling the cylinder head 1a that is likely to increase in temperature.
- the pressure valve 7 is driven to the closed side when the pressure in the circulation path 2 is received and the pressure (system pressure P) is less than the determination value Pa. For this reason, when the system pressure P is a value representing the occurrence of nucleate boiling of the cooling water in the cylinder block 1b, the pressure valve 7 is driven to the closed side to limit the passage of the cooling water through the cylinder block 1b. As a result, the pressure valve 7 is in the midst of restricting the passage of the cooling water through the cylinder block 1b, and the maintenance period t has elapsed after nucleate boiling occurs in the cooling water inside the cylinder block 1b. The passage restriction of the cylinder block 1b of the cooling water is maintained during the nucleate boiling until it elapses.
- the maintenance period t is set to a period in which the system pressure P is a value representing the occurrence of nucleate boiling by the spring 11 of the pressure valve 7.
- the pressure valve 7 is driven to the open side.
- the high-temperature cooling water in the cylinder block 1b can be released to the outside using the convection of heat due to the temperature difference of the cooling water in the second path 2d. become.
- the high temperature cooling water in the cylinder block 1b escape to the outside in this way, it becomes possible to suppress the film boiling of the cooling water in the cylinder block 1b under the above-described situation.
- the third embodiment is modified such that the pressure valve 7 is provided in the internal combustion engine 1.
- the second path 2d merges with a portion in the cylinder head 1a in the first path 2c in a state where the second path 2d is branched into three in the cylinder block 1b. .
- a total of three pressure valves 7 are respectively provided at three branched portions in the second path 2d.
- the pressure valve 7 has the same structure that differs only in shape from that of the third embodiment.
- the pressure valve 7 includes a housing 9 having a pressure chamber 8 communicating with the second path 2d, and a displacement of the pressure chamber 8 provided in the housing 9 by the displacement.
- a spring 11 that urges the valve body 10 in a direction to reduce the volume of the pressure chamber 8.
- the valve body 10 of the pressure valve 7 reduces the volume of the pressure chamber 8 in the housing 9 by the force based on the pressure in the pressure chamber 8 (system pressure P) connected to the second path 2d and the biasing force of the spring 11.
- the port 8a is closed or released by displacing in a direction or an expanding direction.
- the urging force of the spring 11 is determined as in the third embodiment.
- the second path 2d merges with a portion in the cylinder head 1a in the first path 2c in a state where the second path 2d branches into three in the cylinder block 1b.
- a pressure valve 7 is provided for each. For this reason, when the pressure valve 7 releases the restriction on the passage of the cooling water through the cylinder block 1b, the high-temperature cooling water present in the cylinder block 1b in the second path 2d is transferred to the cylinder head 1a (first path 2c). Even if it flows in, the inflow can be distributed. As a result, as described above, when high-temperature cooling water flows into the cylinder head 1a, it is possible to prevent the temperature of the cylinder head 1a from rising locally.
- the circulation path 2 of this embodiment has a first path 2 c passing through the cylinder head 1 a of the internal combustion engine 1 and a cylinder block 1 b passing through the cylinder block 1 b of the internal combustion engine 1 on the downstream side of the pump 3. Branches to two paths 2d. Further, the second path 2d merges with a portion in the cylinder head 1a in the first path 2c in the internal combustion engine 1. Further, an electronically controlled flow control valve 12 for controlling the flow rate of the cooling water passing through the cylinder block 1b (second path 2b) is provided upstream of the cylinder block 1b in the second path 2d.
- the flow rate control valve 12 controls the flow rate of the cooling water passing through the second path 2d (cylinder block 1b) by adjusting the opening degree through drive control by the electronic control unit 4.
- the flow control valve 12 and the electronic control device 4 function as a control unit that restricts passage of the cooling water cylinder block 1b in the second path 2d.
- the electronic control unit 4 inputs a detection signal from the first water temperature sensor 13 that detects the temperature of the cooling water at the outlet of the cylinder head 1a in the first path 2c, and cools the cylinder block 1b in the second path 2d.
- a detection signal from the second water temperature sensor 14 that detects the temperature of the water is input.
- the electronic control unit 4 Based on the detection signal from the first water temperature sensor 13 and the detection signal from the second water temperature sensor 14, the electronic control unit 4 has the highest temperature in the portion located in the cylinder block 1 b of the second path 2 d ( Hereinafter, the temperature of the cooling water at a high temperature location) is estimated and obtained.
- the electronic control unit 4 controls the drive of the flow rate control valve 12 for promoting warm-up of the internal combustion engine 1 (cylinder block 1b) based on the temperature of the cooling water at the high temperature location, more specifically, the second path 2d.
- the degree of opening of the flow rate control valve 12 for restricting the passage of the cooling water through the cylinder block 1b and releasing the restriction is controlled.
- This warming-up routine is periodically executed through the electronic control unit 4 by, for example, a time interruption every predetermined time.
- the temperature of the cooling water at the high temperature portion of the second path 2d is obtained (S201). Thereafter, it is determined whether or not the temperature of the cooling water at the high temperature location is less than the determination value Tb (S202). If the determination is affirmative, the passage of the cooling water through the cylinder block 1b is restricted to promote warming up of the cylinder block 1b (S203). Specifically, the electronic control unit 4 reduces the flow rate of the cooling water passing through the cylinder block 1b to “0” by driving the flow rate control valve 12 to the closed side. In this case, the flow control valve 12 is driven to the closed side until it is fully closed.
- the restriction on the passage of the cooling water through the cylinder block 1b is released in order to suppress the film boiling of the cooling water inside the cylinder block 1b (S204).
- the electronic control unit 4 drives the flow rate control valve 12 that has been driven to the closing side to the opening side, thereby setting the flow rate of the cooling water that passes through the cylinder block 1b to a value greater than “0”, for example, at that time. Increase to the appropriate value for the engine operation.
- the determination value Tb used in S202 is a value corresponding to the temperature of the cooling water at the high temperature point when the boiling state of the cooling water at the high temperature point in the cylinder block 1b shifts from nucleate boiling to film boiling. It is determined in advance by experiments or the like. By determining the determination value Tb in this way, the passage of the cooling water through the cylinder block 1b is restricted before the cooling water film boils inside the cylinder block 1b in the internal combustion engine 1 in the warm-up process. Become. Further, the maintenance period t determined by the determination value Tb has elapsed since the nucleate boiling of the cooling water inside the cylinder block 1b (exactly the high temperature portion) occurred under the above-described restriction.
- the maintenance period t is a period during which the temperature of the cooling water at the high-temperature location is a value representing the occurrence of nucleate boiling of the cooling water by setting the determination value Tb as described above. Is the period from when nucleate boiling occurs in the cooling water until the boiling state of the cooling water switches to film boiling. And when the said maintenance period t passes after the nucleate boiling of the cooling water in the said high temperature location generate
- the maintenance period t is determined by the determination value Tb so that the temperature of the cooling water at the high temperature inside the cylinder block 1b is a value representing the occurrence of nucleate boiling of the cooling water.
- the maintenance is performed during the period when the temperature of the cooling water is a value representing the occurrence of the nucleate boiling.
- the maintenance period t is a period in which the temperature of the cooling water at the high temperature portion indicates the occurrence of nucleate boiling in the cooling water according to the determination value Tb. It is determined in a period until the boiling state of the cooling water is switched to film boiling.
- the restriction on the passage of the cooling water through the cylinder block 1b is maintained over the entire period in which the cooling water is nucleate-boiling inside the cylinder block 1b (more precisely, the above-described high-temperature portion). Therefore, the restriction can be maintained for as long as possible, and the warming-up promotion effect of the cylinder block 1b due to the restriction can be maximized.
- each said embodiment can also be changed as follows, for example.
- the flow rate of the cooling water passing through the internal combustion engine 1 is reduced to “0” by stopping the driving of the pump 3.
- a method of reducing the flow rate of the cooling water passing through the internal combustion engine 1 to a value larger than “0” by reducing the discharge amount of the pump 3 may be adopted.
- the determination value Pa is set to a value corresponding to the pressure in the circulation path 2 when the boiling state of the cooling water inside the internal combustion engine 1 shifts from nucleate boiling to film boiling.
- the determination value Pa may be set to a value smaller than such a value so that the sustain period t is shortened.
- the maintenance period t is set to a period shorter than a period from when nucleate boiling occurs in the cooling water inside the internal combustion engine 1 to when the boiling state of the cooling water switches to film boiling.
- the maintenance period t is a period in which the system pressure P is a value representing the occurrence of the nucleate boiling in the cooling water inside the internal combustion engine 1. This is because such a short maintenance period t is a part of a period from when nucleate boiling occurs in the cooling water inside the internal combustion engine 1 to when the boiling state of the cooling water switches to film boiling.
- the maintenance period t is set to a period in which the temperature of the cooling water inside the internal combustion engine 1 is a value representing the occurrence of nucleate boiling in the cooling water. Good.
- This can be realized, for example, as follows. That is, the temperature of the cooling water inside the internal combustion engine 1 is obtained by actual measurement or estimation. And when the calculated
- the internal combustion engine is driven by driving the flow rate control valve 6 to the closed side until the opening degree is larger than the fully closed state.
- a method of reducing the flow rate of the cooling water passing through the engine 1 to a value larger than “0” may be employed.
- the flow control valve 6 does not necessarily need to be an electronic control type, and when the pressure (system pressure P) is less than the judgment value Pa in response to the pressure in the circulation path 2 It may be a pressure valve that is driven to the close side while being driven to the open side when the system pressure P is equal to or higher than a determination value.
- the pressure valve 7 is driven to the closed side until the opening degree is closer to the open side than the fully closed state.
- a method of reducing the flow rate of the cooling water passing through the cylinder block 1b to a value larger than “0” may be employed.
- the pressure valve 7 when the system pressure P is less than the determination value Pa, the pressure valve 7 is driven to the closed side, while the system pressure P is smaller than the determination value Pa.
- the biasing force of the spring 11 in the pressure valve 7 may be determined so that the pressure valve 7 is driven to the open side when the above is true.
- the maintenance period t is set to a period shorter than the period from when nucleate boiling occurs in the cooling water inside the cylinder block 1b until the boiling state of the cooling water switches to film boiling.
- the maintenance period t is a period in which the system pressure P is a value representing the occurrence of the nucleate boiling in the cooling water inside the cylinder block 1b.
- the second path 2d it is not always necessary to connect the second path 2d to the first path 2c in a state where the second path 2d is branched into three.
- It may be connected to the first path 2c in a state of branching to a number other than. In this case, the number of pressure valves 7 is also changed in accordance with the number of branches.
- the cylinder is provided by driving the flow control valve 12 to the closed side until the opening degree is more open than the fully closed state.
- the determination value Tb is set to a value corresponding to the temperature of the cooling water at the time when the boiling state of the cooling water inside the cylinder block 1b shifts from nucleate boiling to film boiling.
- the determination value Tb may be set to a value smaller than such a value so that the sustain period t is shortened.
- the maintenance period t is set to a period shorter than the period from when nucleate boiling occurs in the cooling water inside the cylinder block 1b until the boiling state of the cooling water switches to film boiling.
- the maintenance period t is a period in which the temperature of the cooling water inside the cylinder block 1b is a value representing the occurrence of nucleate boiling in the cooling water.
- the second water temperature sensor 14 may be omitted.
- the detection signal from the first water temperature sensor 13 the engine operating state such as the engine rotational speed and the engine load, and the pump 3 It is conceivable to estimate from the driving state of the pump 3 such as the cooling water discharge amount.
- the maintenance period t is defined as the period when the temperature of the cooling water in the high temperature location in the cylinder block 1b of the 2nd path
- route 2d is a value showing generation
- This can be realized, for example, as follows. That is, the system pressure P of the circulation path 2 is obtained by a pressure sensor or the like. And when the calculated
- the maintenance period t is set to the above-described period by limiting the passage of the cooling water through the cylinder block 1b and releasing the restriction.
- the flow control valve 12 may be provided in a portion that passes through the cylinder block 1b in the second path 2d.
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Abstract
Description
以下、本発明を、自動車等の車両に搭載される内燃機関の暖機促進装置に具体化した第1実施形態について、図1~図3を参照して説明する。
内燃機関1の暖機中であって冷却水の同機関1の通過を制限しているとき、系統圧P(循環経路2内の圧力)は時間経過に伴って図2(a)に実線で示されるように推移し、内燃機関1の内部における冷却水の温度は時間経過に伴って図2(b)に実線で示されるように推移する。同図から分かるように、内燃機関1の暖機を促進すべく冷却水の同機関1の通過を制限した状態にあっては、内燃機関1の内部に存在する冷却水が同機関1からの熱を受けて図2(b)に示すように温度上昇し、それに起因して冷却水が核沸騰する(タイミングT1)。その後、冷却水の内燃機関1の通過を制限した状態が維持されたとすると、内燃機関1の内部の冷却水が同機関1からの熱を受けることで、その冷却水の沸騰状態が核沸騰から膜沸騰に移行する(タイミングT2)。
(1)内燃機関1の暖機を促進すべく冷却水の内燃機関1の通過を制限している最中であって、同機関1の内部の冷却水が核沸騰しているときには、上記冷却水の内燃機関1の通過の制限が維持される。詳しくは、内燃機関1の内部の冷却水に核沸騰が発生してから維持期間tが経過するまでの核沸騰中には、上記冷却水の内燃機関1の通過の制限が維持される。これにより、冷却水の内燃機関1の通過を制限することでの同機関1の暖機促進を効果的なものとすることができる。
次に、本発明の第2実施形態を図4に基づき説明する。
この実施形態は、流量制御弁によって冷却水の内燃機関1の通過を制限するようにしたものである。
(5)冷却水の内燃機関1の通過の制限は、内燃機関1を通過する冷却水の流量を制御可能な流量制御弁6の駆動制御(開度制御)を通じて、上記流量を「0」まで減少させることにより実現される。このため、冷却水の内燃機関1の通過を制限している最中であって同機関1の内部の冷却水が核沸騰しているとき、上記制限を維持することは、流量制御弁6を閉じ側に駆動した状態に維持することで実現できる。
次に、本発明の第3実施形態を図5及び図6に基づき説明する。
図5に示すように、この実施形態の循環経路2は、ポンプ3の下流側において、内燃機関1のシリンダヘッド1aを通過する第1経路2cと、内燃機関1のシリンダブロック1bを通過する第2経路2dとに分岐している。これら第1経路2cと第2経路2dとは内燃機関1の下流で合流している。ここで、内燃機関1において、シリンダヘッド1aは燃焼室内の燃焼ガスからの熱を受けて温度上昇しやすくなる一方、シリンダブロック1bは上記熱を受けにくい関係から温度上昇しにくくなる。このため、温度上昇しやすいシリンダヘッド1aを冷却しつつ、温度上昇しにくいシリンダブロック1bの暖機を促進することが望まれている。
同図に示すように、圧力弁7は、第2経路2dに連通する圧力室8を有するハウジング9と、そのハウジング9内に変位可能に設けられて同変位によって圧力室8の容積を可変とする弁体10と、その弁体10を圧力室8の容積を縮小する方向に付勢するばね11とを備えている。圧力弁7の弁体10は、第2経路2dに繋がる圧力室8内の圧力(系統圧P)に基づく力とばね11の付勢力とにより、ハウジング9内で圧力室8の容積を縮小する方向や拡大する方向に変位する。
(6)圧力弁7の閉じ側への駆動により、冷却水のシリンダブロック1bの通過を制限することで、温度上昇しにくいシリンダブロック1bの効果的な暖機(温度上昇)を実現することができる。また、上述したように冷却水のシリンダブロック1bの通過を制限しているときには、第1経路2cの冷却水がシリンダヘッド1aを通過するため、温度上昇しやすいシリンダヘッド1aを上記冷却水によって冷却することができる。従って、温度上昇しやすいシリンダヘッド1aを冷却しつつ、温度上昇しにくいシリンダブロック1bを効果的に暖機することができる。
(8)圧力弁7は、電源供給を受けずに自身を駆動することが可能である。このため、車両の停止直後に同車両各所への電源供給が停止された状態にあって、内燃機関1のシリンダブロック1b内の冷却水が同機関1からの熱を受けて温度上昇するとき、系統圧Pが判定値Pa以上であれば圧力弁7が開き側に駆動されるようになる。このように圧力弁7が開き側に駆動されると、第2経路2d内の冷却水の温度差による熱の対流を利用してシリンダブロック1b内の高温の冷却水を外部に逃がすことが可能になる。そして、このようにシリンダブロック1b内の高温の冷却水を外部に逃がすことで、上述した状況のもとでのシリンダブロック1b内における冷却水の膜沸騰を抑制することができるようになる。
次に、本発明の第4実施形態を図7及び図8に基づき説明する。
この実施形態は、第3実施形態を変更し、圧力弁7を内燃機関1に設けるようにしたものである。図7に示すように、この実施形態の循環経路2では、第2経路2dがシリンダブロック1b内にて三つに分岐した状態で第1経路2cにおけるシリンダヘッド1a内の部分に合流している。そして、計三つの圧力弁7が、第2経路2dにおける三つに分岐した部分にそれぞれ設けられている。
(9)第2経路2dがシリンダブロック1b内にて三つに分岐した状態で第1経路2cにおけるシリンダヘッド1a内の部分と合流しており、第2経路2dにおける三つに分岐した部分にそれぞれ圧力弁7が設けられている。このため、圧力弁7が冷却水のシリンダブロック1bの通過の制限を解除したとき、第2経路2dにおけるシリンダブロック1b内に存在していた高温の冷却水がシリンダヘッド1a(第1経路2c)に流入するとしても、その流入を分散させて行うことができる。その結果、上述したように高温の冷却水がシリンダヘッド1aに流入する際、それに伴って同シリンダヘッド1aが局所的に温度上昇してしまうことを抑制できる。
次に、本発明の第5実施形態を図9及び図10に基づき説明する。
図9に示すように、この実施形態の循環経路2は、ポンプ3の下流側において、内燃機関1のシリンダヘッド1aを通過する第1経路2cと、内燃機関1のシリンダブロック1bを通過する第2経路2dとに分岐している。更に、この第2経路2dが内燃機関1内にて第1経路2cにおけるシリンダヘッド1a内の部分と合流している。また、第2経路2dにおけるシリンダブロック1bの上流には、シリンダブロック1b(第2経路2b)を通過する冷却水の流量を制御するための電子制御式の流量制御弁12が設けられている。この流量制御弁12は、電子制御装置4による駆動制御を通じて開度調整されることで、第2経路2d(シリンダブロック1b)を通過する冷却水の流量を制御するものである。これら流量制御弁12及び電子制御装置4は、第2経路2dの冷却水のシリンダブロック1bの通過を制限する制御部として機能する。
(10)上記維持期間tは、判定値Tbにより、シリンダブロック1bの内部の上記高温箇所での冷却水の温度が同冷却水の核沸騰の発生を表す値になっている期間に定められる。ここで、上記高温箇所での冷却水の温度と同冷却水の核沸騰との間には相関があり、その冷却水の温度が上記核沸騰の発生を表す値になっている期間に上記維持期間tを定め、その維持期間t中に冷却水のシリンダブロック1bの通過を制限することで、上記核沸騰が発生しているときに冷却水のシリンダブロック1bの通過の制限を維持することができる。
なお、上記各実施形態は、例えば以下のように変更することもできる。
・第1実施形態においては、冷却水の内燃機関1の通過を制限する具体的な方法として、ポンプ3の駆動停止により内燃機関1を通過する冷却水の流量を「0」まで減少させることを例示したが、ポンプ3の吐出量低減により内燃機関1を通過する冷却水の流量を「0」よりも多い値まで減少させるという方法を採用してもよい。
Claims (8)
- 冷却水が内燃機関を通過するように循環する循環経路と、前記冷却水の内燃機関の通過を制御する制御部とを備え、内燃機関を暖機する際に前記制御部により前記冷却水の同機関の通過を制限する内燃機関の暖機促進装置において、
前記制御部は、前記冷却水の内燃機関の通過を制限している最中であって同機関の内部の冷却水が核沸騰しているときに前記制限を維持する
ことを特徴とする内燃機関の暖機促進装置。 - 前記制御部は、前記核沸騰が発生してから維持期間が経過するまでの核沸騰中、前記冷却水の内燃機関の通過制限を維持するものであり、
前記維持期間は、前記循環経路内の圧力が前記核沸騰の発生を表す値になっている期間に定められる
請求項1記載の内燃機関の暖機促進装置。 - 前記制御部は、前記核沸騰が発生してから維持期間が経過するまでの核沸騰中、前記冷却水の内燃機関の通過制限を維持するものであり、
前記維持期間は、内燃機関内部の冷却水の温度が前記核沸騰の発生を表す値になっている期間に定められる
請求項1記載の内燃機関の暖機促進装置。 - 前記制御部は、内燃機関を通過する冷却水の流量を制御するための流量制御弁を備えており、その流量制御弁を閉じ側に駆動することにより前記冷却水の内燃機関の通過を制限する
請求項1~3のいずれか一項に記載の内燃機関の暖機促進装置。 - 前記制御部は、前記循環経路内の圧力に基づき内燃機関を通過する冷却水の流量を制御する圧力弁であり、
前記圧力弁は、前記循環経路内の圧力を受けて同圧力が前記核沸騰の発生を表す値であるときに閉じ側に駆動された状態を維持することにより、前記冷却水の内燃機関の通過の制限を維持するとともに、前記維持期間を前記循環経路内の圧力が前記核沸騰の発生を表す値になっている期間に定めるものである
請求項2記載の内燃機関の暖機促進装置。 - 前記制御部は、内燃機関を通過する冷却水の流量を制御可能なポンプを備えており、そのポンプにおける冷却水の吐出量を減少させることにより前記冷却水の内燃機関の通過を制限する
請求項1~3のいずれか一項に記載の内燃機関の暖機促進装置。 - 前記維持期間は、内燃機関の内部の冷却水に前記核沸騰が発生してから同冷却水の沸騰状態が膜沸騰に切り替わるまでの期間に定められる
請求項2又は3記載の内燃機関の暖機促進装置。 - 前記循環経路は、内燃機関のシリンダヘッドを通過する第1経路とシリンダブロックを通過する第2経路とを備えており、
前記制御部は、前記第2経路の冷却水の前記シリンダブロックの通過を制限するものである
請求項1~5、及び7のうちのいずれか一項に記載の内燃機関の暖機促進装置。
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PCT/JP2011/054926 WO2012117554A1 (ja) | 2011-03-03 | 2011-03-03 | 内燃機関の暖機促進装置 |
CN201180068772.3A CN103415680B (zh) | 2011-03-03 | 2011-03-03 | 内燃机的暖机促进装置 |
EP11859799.6A EP2682582B1 (en) | 2011-03-03 | 2011-03-03 | Warmup acceleration device for internal combustion engine |
US14/002,315 US9121332B2 (en) | 2011-03-03 | 2011-03-03 | Warmup acceleration device for internal combustion engine |
JP2013502118A JP5700113B2 (ja) | 2011-03-03 | 2011-03-03 | 内燃機関の暖機促進装置 |
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JP6210041B2 (ja) * | 2014-09-25 | 2017-10-11 | マツダ株式会社 | エンジンの冷却システム |
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Also Published As
Publication number | Publication date |
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US20130333641A1 (en) | 2013-12-19 |
EP2682582B1 (en) | 2016-12-21 |
JP5700113B2 (ja) | 2015-04-15 |
US9121332B2 (en) | 2015-09-01 |
EP2682582A4 (en) | 2014-08-20 |
CN103415680B (zh) | 2016-08-24 |
EP2682582A1 (en) | 2014-01-08 |
JPWO2012117554A1 (ja) | 2014-07-07 |
CN103415680A (zh) | 2013-11-27 |
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