JP2017155608A - Cooling device of vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device of a vehicle which enhances a correlation between a water temperature of an in-engine cooling water passage and an initial water temperature which is detected by a water temperature sensor while sufficiently exhibiting a promotion function of the warmup of an internal combustion engine.SOLUTION: A cooling device of a vehicle supplies cooling water to an in-engine cooling water passage from an out-engine cooling water passage by starting water passage processing for driving an electric pump after a start of an operation of an internal combustion engine (S201). When the quantity of the supplied cooling water reaches a prescribed quantity Wa, an operation of the electric pump (S202, S203) is stopped. Warmup determination is performed by using a water temperature of the cooling water at this time (S204 to S206). The operation of the electric pump is restarted after a finish of the warmup of the internal combustion engine (S207). In the prescribed quantity Wa, a first capacity which is obtained by adding a capacity of a head-side water jacket of the in-engine cooling water passage and a capacity of a region R from one end of the out-engine cooling water passage up to a detection position at which a water temperature sensor is arranged is set as a lower limit, and a second capacity which is obtained by adding the whole of the in-engine cooling water passage and the capacity of the region R is set as an upper limit.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle cooling device.

  The vehicle is provided with a cooling device for cooling each part of the vehicle. The cooling device has an in-engine cooling water passage for cooling an engine body including a cylinder block and a cylinder head. The engine coolant passage has a block-side water jacket formed in the cylinder block and a head-side water jacket formed in the cylinder head. The block-side water jacket and the head-side water jacket communicate with each other inside the engine body. One end of the external coolant passage is connected to the outlet of the head side water jacket of the internal coolant passage. The other end of the engine external coolant passage is connected to the inlet of the block-side water jacket of the engine coolant passage. An electric pump is provided in the cooling water passage outside the engine. When the electric pump is driven, cooling water is supplied from the cooling water passage outside the engine to the block-side water jacket of the cooling water passage inside the engine. The cooling water supplied to the block-side water jacket flows to the head-side water jacket, and the cooling water that has flowed to the head-side water jacket is discharged to the cooling water passage outside the engine. The cooling water discharged to the outside engine cooling water passage is supplied again to the block-side water jacket through the passage. A water temperature sensor that detects the temperature of the cooling water is also provided in the cooling water passage outside the engine.

  In the vehicle cooling device, in order to warm up the internal combustion engine at an early stage, the operation of the electric pump is stopped when the operation of the internal combustion engine is started, and the supply of the cooling water to the engine coolant passage is stopped. When the warm-up of the internal combustion engine is completed, the operation of the electric pump is started and cooling water is supplied from the outside engine cooling water passage to the inside cooling water passage. Whether or not the internal combustion engine has been warmed up is determined based on the estimated water temperature in the internal coolant passage calculated from the coolant temperature detected by the water temperature sensor and the heat generation amount of the internal combustion engine. Is called. When the estimated water temperature reaches the reference temperature, it is determined that the warm-up is completed. When the internal combustion engine is stopped, the temperature of the cooling water in the engine cooling water passage may rise due to the heat of the engine body. When the operation of the internal combustion engine is started while the temperature of the cooling water in the engine cooling water passage is correspondingly increased, the cooling is performed in the engine cooling water passage and the engine outside cooling water passage provided with a water temperature sensor. Differences in water temperature may occur. If the temperature difference is generated in this way and the warm-up determination is performed using the water temperature detected by the water temperature sensor, it is difficult to satisfy the accuracy of the warm-up determination.

  The vehicle cooling device described in Patent Document 1 starts the operation of the electric pump from the time when the operation of the internal combustion engine is started, and supplies the cooling water to the engine coolant passage. The temperature of the cooling water in the engine cooling water passage is increased by the heat of the engine body, and there may be a temperature difference between the cooling water in the cooling water passage outside the engine. In this case, the temperature of the cooling water detected by the water temperature sensor varies with the flow of the cooling water. When the flow of the cooling water continues, the high temperature cooling water in the internal cooling water passage and the low temperature cooling water in the external cooling water passage are gradually mixed, and the temperature fluctuation is reduced. This vehicle cooling device stops the operation of the electric pump when the fluctuation range of the temperature of the cooling water becomes equal to or less than the reference value, and detects the temperature of the cooling water used for the warm-up determination. Thus, after the operation of the internal combustion engine is started, the warm-up determination is performed in a state where the temperature difference between the cooling water in the engine cooling water passage and the engine cooling water passage is reduced.

JP 2013-231390 A

  The cooling device for a vehicle described in Patent Literature 1 must repeat the circulation of the cooling water until the fluctuation range of the temperature of the cooling water becomes equal to or less than a predetermined value. For this reason, it may take some time to stop the operation of the electric pump in the cooling device. Therefore, there is a possibility that the function of warming up the internal combustion engine early cannot be obtained sufficiently.

  A vehicle cooling apparatus for solving the above problems is a cooling water passage for cooling an engine body including a cylinder block and a cylinder head, and is formed in a block-side water jacket formed in the cylinder block and the cylinder head. And a cooling water passage in the engine having a head side water jacket to which cooling water is supplied from the block side water jacket, and one end connected to the outlet of the head side water jacket and the inlet of the block side water jacket. The other end is connected, and is provided in an outside engine cooling water passage for supplying cooling water discharged from the head side water jacket to the block side water jacket, and in the outside engine cooling water passage, and the temperature of the cooling water is set. A water temperature sensor to detect and provided in the cooling water passage outside the engine. A pump for supplying cooling water from the cooling water passage outside the engine to the cooling water passage in the engine, a control unit for controlling the pump, and a warm-up of the internal combustion engine based on the coolant temperature detected by the water temperature sensor A warm-up determination unit that performs a warm-up determination as to whether or not the engine has been completed, and the control unit starts a water flow process for operating the pump from the time when the operation of the internal combustion engine is started, and the engine When the supply amount of the cooling water supplied from the outer cooling water passage to the engine cooling water passage reaches a predetermined amount, the operation of the pump is stopped and the water flow treatment is stopped. The operation of the pump is resumed when it is determined that the warm-up of the internal combustion engine is completed, and the warm-up determination unit uses the temperature of the cooling water when the operation of the pump is stopped. To determine the warm-up, and The fixed amount is the lower limit of the first capacity obtained by adding the capacity of the head-side water jacket and the capacity from the one end of the cooling water passage outside the engine to the detection position where the water temperature sensor is provided. The second capacity obtained by adding the capacity of the entire water passage and the capacity from the one end to the detection position in the outside cooling water passage is the upper limit, and the cooling water is supplied during the water flow treatment in the outside cooling water passage. The capacity of the flowing part is not less than the second capacity.

  In the above configuration, the water flow treatment for operating the pump is started when the operation of the internal combustion engine is started, and a predetermined amount of cooling water is supplied from the cooling water passage outside the engine to the cooling water passage inside the engine. Thereby, in the cooling device, the cooling water remaining in the engine cooling water passage in the engine body is discharged to the engine cooling water passage. When the cooling water in the engine cooling water passage is thus replaced, the operation of the pump is stopped and the flow of the cooling water is stopped. When the operation of the internal combustion engine is started, not only the cooling water staying at the cylinder head may be relatively hot, but also the temperature of the cooling water rises due to heat received from the cylinder head of the engine body. Cheap. Cooling water of a relatively high temperature from the head side water jacket is caused to flow by flowing cooling water for a first capacity obtained by adding the capacity of the head side water jacket and the capacity from the one end to the detection position in the cooling water passage outside the engine. The cooling water remaining in the block-side water jacket can be made to flow to the head-side water jacket and the water temperature sensor. Thereby, the correlation between the temperature of the cooling water detected by the water temperature sensor and the temperature of the cooling water in the head-side water jacket can be increased. Further, if the cooling water for the second capacity obtained by adding the capacity of the entire cooling water passage in the engine and the capacity from the one end to the detection position in the cooling water passage outside the engine is caused to flow, the cooling water passage outside the engine The cooling water supplied to the engine cooling water passage can be made to flow to the water temperature sensor. Since the capacity of the portion of the cooling water passage outside the engine where the cooling water flows during the water flow treatment is greater than or equal to the second capacity, the cooling discharged from the engine cooling water passage to the engine cooling water passage by the water flow treatment Water is not returned to the engine coolant passage again. Therefore, it is possible to increase the correlation between the temperature of the cooling water detected by the water temperature sensor and the temperature of the cooling water in the entire engine cooling water passage while replacing all the cooling water in the engine cooling water passage.

  As described above, in the above configuration, the temperature of the cooling water detected by the water temperature sensor and the cooling water in the engine cooling water passage are suppressed while preventing the cooling water from flowing more than necessary when the operation of the internal combustion engine is started. Correlation with temperature can be increased. Therefore, while making it possible to fully exert the function of promoting warm-up of the internal combustion engine, the correlation between the coolant temperature in the engine coolant passage and the initial water temperature detected by the water temperature sensor is increased, and the warm-up determination is performed. The accuracy can also be improved.

The schematic diagram which shows schematic structure of one Embodiment of the cooling device of a vehicle. The flowchart which shows the flow of a series of processes of the warming-up control at the start which the cooling device of a vehicle performs when the driving | operation of an internal combustion engine is started.

An embodiment of a cooling device for a vehicle will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the cooling device for a vehicle is branched from an engine cooling water passage 10, an engine cooling water passage 20 connected to the engine cooling water passage 10, and an engine cooling water passage 20. And a branch passage 40 provided. The engine cooling water passage 10 is a cooling water passage for cooling the engine main body 100 constituted by the cylinder block 101 and the cylinder head 102. The engine coolant passage 10 includes a block-side water jacket 11 formed in the cylinder block 101 and a head-side water jacket 12 formed in the cylinder head 102. The block side water jacket 11 and the head side water jacket 12 communicate with each other inside the engine body 100.

  The outside engine coolant passage 20 is connected to a discharge main passage 21 connected to the outlet of the head side water jacket 12 of the inside coolant passage 10 and the inlet of the block side water jacket 11 of the inside coolant passage 10. Supply main passage 22. The discharge main passage 21 is provided with a water temperature sensor 23 for detecting the temperature of the cooling water. The cooling main passage 21 is connected to two cooling paths including an EGR path 24 and a heater path 25.

  The EGR path 24 is provided with an EGR cooler 24A, a switching valve cooling unit 24B, and a control valve cooling unit 24C. The EGR cooler 24A is disposed in an EGR passage that returns a part of the exhaust gas of the internal combustion engine to the intake passage as EGR gas. The EGR cooler 24A adjusts the temperature of the EGR gas by heat exchange between the EGR gas and the cooling water. The switching valve cooling unit 24B has an EGR passage switching valve (not shown) that switches the flow of EGR gas in the EGR passage between a flow that passes through the EGR cooler 24A and a flow that bypasses the EGR cooler 24A as its cooling target. When the cooling water is supplied to the switching valve cooling unit 24B, the EGR passage switching valve is cooled by heat exchange with the cooling water. The control valve cooling unit 24C uses an EGR control valve (not shown) that controls the amount of EGR gas flowing through the EGR passage as a cooling target. When cooling water is supplied to the control valve cooling unit 24C, the EGR control valve is cooled by heat exchange with the cooling water.

  The heater path 25 is branched into two and has a first passage 26 and a second passage 27. The first passage 26 is provided with a first electromagnetic valve 26A that controls the flow rate of the cooling water. A heater core 26B is provided downstream of the first electromagnetic valve 26A. The heater core 26B is a heat exchanger that warms the air blown into the vehicle interior by the heat of the cooling water when heating the vehicle interior of the vehicle. The second passage 27 is provided with a second electromagnetic valve 27A that controls the flow rate of the cooling water. An ATF (Automatic Transmission Fluid) warmer 27B is provided downstream of the second electromagnetic valve 27A. The ATF warmer 27B is a heat exchanger that warms oil that lubricates the transmission of the vehicle by the heat of the cooling water. The portion on the downstream side of the heater core 26B in the first passage 26 and the portion on the downstream side of the ATF warmer 27B in the second passage 27 merge. Further, the heater path 25 and the EGR path 24 merge on the downstream side to constitute a merge path 28. The merge passage 28 is connected to a thermostat 30 provided at one end of the supply main passage 22.

  One end of the branch passage 40 extends from one end connected to the head-side water jacket 12 in the discharge main passage 21 of the external coolant passage 20 to the other end to which the EGR passage 24 and the heater passage 25 are connected. It is connected. The other end of the branch passage 40 is connected to the thermostat 30 of the supply main passage 22. A radiator 41 is provided in the branch passage 40. In the radiator 41, the cooling water releases its heat to the atmosphere. Thereby, the temperature of cooling water falls. A reserve tank 42 is connected to the radiator 41. The reserve tank 42 stores a predetermined amount of cooling water, and the inside thereof is separated into a gas layer and a liquid layer. When the volume of the cooling water changes due to the temperature change of the cooling water, the cooling water moves between the reserve tank 42 and the radiator 41. Thereby, the lack of the cooling water in a cooling device and the excessive pressure rise are suppressed.

  The thermostat 30 provided in the supply main passage 22 is a temperature-sensitive control valve in which the opening degree of the internal valve body changes according to the temperature of the cooling water. The thermostat 30 changes the communication state between the branch passage 40 and the supply main passage 22 according to the temperature of the cooling water, while keeping the joining passage 28 and the supply main passage 22 in communication with each other. That is, when the temperature of the cooling water is lower than the predetermined temperature, the valve element is closed, and the branch passage 40 and the supply main passage 22 are brought into a non-communication state. Further, when the temperature of the cooling water is equal to or higher than the predetermined temperature, the valve element is opened, and the branch passage 40 and the supply main passage 22 are brought into communication. As the predetermined temperature, for example, the temperature of the cooling water when the warming up of the internal combustion engine is completed is set.

  The supply main passage 22 is also provided with an electric pump 31 that is driven by a motor and supplies cooling water from the engine cooling water passage 20 to the engine cooling water passage 10. When the operation of the electric pump 31 is started, cooling water is supplied to the block-side water jacket 11 of the engine cooling water passage 10 from the supply main passage 22 that is the engine cooling water passage 20. Further, the amount of cooling water supplied to the block-side water jacket 11 changes according to the drive amount of the electric pump 31. The cooling water supplied to the block-side water jacket 11 flows to the head-side water jacket 12, and the cooling water that flows to the head-side water jacket 12 is discharged to the discharge main passage 21 that is the engine-side cooling water passage 20. When the temperature of the cooling water is low and the thermostat 30 is in a closed state, such as when the operation of the internal combustion engine is started after the internal combustion engine has been stopped for a long time, the cooling water passage 20 outside the engine from the head side water jacket 12 is closed. The cooling water discharged in the flow does not flow into the branch passage 40 but flows into the supply main passage 22 only through the EGR path 24 and the heater path 25. On the other hand, when the temperature of the cooling water is high and the thermostat 30 is in the open state, such as after the warm-up of the internal combustion engine is completed, the cooling water discharged from the head-side water jacket 12 to the outside engine cooling water passage 20 In addition to the EGR path 24 and the heater path 25 which are the outer cooling water passages 20, they flow to the supply main passage 22 through the branch passage 40. The cooling water that has flowed into the supply main passage 22 is sucked into the electric pump 31 and supplied again to the block-side water jacket 11 in the engine cooling water passage 10. As described above, the external coolant passage 20 is a coolant passage that constitutes a series of flows that discharge the coolant from the head-side water jacket 12 and flow it to the block-side water jacket 11 before the warm-up of the internal combustion engine is completed. is there. The amount of cooling water flowing through the heater path 25 is adjusted according to the opening degrees of the first electromagnetic valve 26A and the second electromagnetic valve 27A.

  The vehicle cooling device is provided with a control device 50. An output signal from the water temperature sensor 23 is input to the control device 50. In addition, signals output from various sensors provided in the vehicle are also input to the control device 50. The various sensors include an accelerator sensor 60 that detects the amount of operation of the accelerator pedal, a rotation speed sensor 61 that detects the engine rotation speed of the internal combustion engine, an ignition switch 62, a temperature setting switch 63 that sets the air conditioning temperature in the vehicle interior, and a vehicle. There is an oil temperature sensor 64 for detecting the temperature of lubricating oil of the transmission. The control device 50 controls the opening degree of the first electromagnetic valve 26A based on the output signal of the temperature setting switch 63, and controls the opening degree of the second electromagnetic valve 27A based on the output signal of the oil temperature sensor 64. That is, the control device 50 calculates the target temperature of the air blown into the vehicle interior based on the output signal of the temperature setting switch 63. Then, when the temperature of the cooling water is higher than the temperature of the outside air and the air blown into the passenger compartment can be warmed, the amount of cooling water required to increase the temperature to the target temperature is obtained. 1 The opening degree of the electromagnetic valve 26A is adjusted, and the amount of cooling water supplied to the heater core 26B is adjusted. When it is not necessary to heat the passenger compartment or when the temperature of the cooling water is low, the first electromagnetic valve 26A is fully closed. Further, the control device 50 adjusts the temperature of the lubricating oil of the transmission based on the output signal of the oil temperature sensor 64. For example, when the detected temperature of the lubricating oil is higher than the target temperature of the lubricating oil, cooling water is supplied to cool the lubricating oil. At this time, the opening degree of the second electromagnetic valve 27A is set so as to increase as the detected temperature is higher than the target temperature. Further, when the temperature of the cooling water is higher than the temperature of the lubricating oil, the lubricating oil may be warmed by supplying the cooling water.

  The control device 50 performs a warm-up determination as to whether or not the warm-up of the internal combustion engine has been completed, and a control unit 51 that controls the electric pump 31 as a functional unit configured by at least one of software and hardware. A warm-up determination unit 52 is provided. When the operation of the internal combustion engine is started, the control device 50 performs start-up warm-up control by the control unit 51, the warm-up determination unit 52, and the like.

  With reference to the flowchart of FIG. 2, a flow of a series of processes related to the start-up warm-up control executed by the control device 50 will be described. The control device 50 executes this series of processes at predetermined intervals.

  As shown in FIG. 2, when this series of processing is executed, the control device 50 first determines whether or not the ignition switch 62 is turned on (step S200). In this process, when it is determined that the ignition switch 62 is not turned on (step S200: NO), it is not the time when the operation of the internal combustion engine is started. The series of processes related to is terminated.

  On the other hand, when it is determined that the ignition switch 62 has been turned on (step S200: YES), the control unit 51 starts the operation of the electric pump 31 (step S201). Thus, the process of operating the electric pump 31 from the time when the operation of the internal combustion engine is started is referred to as water-passing treatment. When the operation of the electric pump 31 is started, the cooling water is supplied from the engine cooling water passage 20 to the engine cooling water passage 10, and the cooling water remaining in the engine cooling water passage 10 in the engine body 100 is used as the engine. It is discharged to the outer cooling water passage 20. When the control unit 51 starts the water flow treatment, next, whether or not the supply amount Wt of the cooling water supplied from the engine cooling water passage 20 to the engine cooling water passage 10 by the water flow treatment is equal to or greater than the predetermined amount Wa. It is determined whether or not (step S202). The cooling water supply amount Wt can be obtained from the drive amount of the electric pump 31 and the operation time thereof. In this process, as a predetermined amount, the entire capacity of the engine cooling water passage 10 and the region from the one end connected to the head side water jacket 12 in the discharge main passage 21 to the detection position where the water temperature sensor 23 is provided. A second capacity, which is a capacity obtained by adding the R capacity, is set. In the process of step S202, when the supply amount Wt of the cooling water does not reach the predetermined amount Wa (step S202: NO), the process of step S202 is repeated without proceeding to the next process.

  Thereafter, by continuing the operation of the electric pump 31, the supply amount Wt of the cooling water increases, and when the supply amount Wt of the cooling water reaches the predetermined amount Wa (step S202: YES), that is, cooling for the second capacity. When water is supplied to the engine coolant passage 10, the controller 51 stops the operation of the electric pump 31 (step S203). Thereby, a water flow process is stopped. By this water flow treatment, the cooling water remaining in the engine main body 100 when the internal combustion engine is stopped is discharged to the engine external cooling water passage 20. The cooling water discharged to the outside engine cooling water passage 20 flows through the main discharge passage 21 to the EGR passage 24 and the first passage 26 and the second passage 27 of the heater passage 25. The capacity of the portion through which the cooling water flows during the water flow treatment in the engine outside cooling water passage 20 is set to the second capacity or more. That is, when the first electromagnetic valve 26A and the second electromagnetic valve 27A are opened and the cooling water is flowing in the entire outside engine cooling water passage 20, the main discharge passage 21, the EGR passage 24, the heater passage 25, the merging passage 28 and the flow path diameter and flow path length in the engine outside cooling water passage 20 are set so that the capacity obtained by adding all the capacities of the supply main passage 22 is larger than the second capacity. Therefore, the cooling water discharged from the engine cooling water passage 10 to the engine cooling water passage 20 by the water flow treatment is not returned to the engine cooling water passage 10 again.

  Since the cooling water supply amount Wt is equal to or larger than the second capacity larger than the entire capacity of the engine cooling water passage 10, a part of the cooling water supplied from the block-side water jacket 11 of the engine cooling water passage 10 is Then, it passes through the engine cooling water passage 10 and flows to the water temperature sensor 23 in the engine cooling water passage 20. The warm-up determination unit 52 acquires the temperature of the cooling water based on the output signal of the water temperature sensor 23 after flowing the cooling water in this way (step S204). Hereinafter, the temperature of the cooling water acquired in the process of step S204 is referred to as an initial water temperature.

  When the warm-up determination unit 52 acquires the initial water temperature, the warm-up determination unit 52 determines the initial water temperature, the amount of heat generated by the engine main body 100 after acquiring the initial water temperature, the heat transfer rate from the engine main body 100 to the cooling water passage 10 in the engine, and the like. Based on this, the estimated water temperature Ts of the engine cooling water passage 10 is calculated (step S205). The amount of heat generated by the engine body 100 correlates with the fuel injection amount calculated based on the engine rotation speed and the accelerator operation amount. Therefore, for example, a map indicating the relationship between the fuel injection amount and the heat generation amount is stored in advance, and the heat generation amount of the engine body 100 is calculated based on the calculated fuel injection amount and this map. Further, the heat transfer coefficient from the engine main body 100 to the engine coolant passage 10 can be calculated by conducting experiments and simulations in advance. The calculated heat transfer coefficient is stored in the control device 50 in advance. After calculating the estimated water temperature Ts, the warm-up determination unit 52 next determines whether or not the estimated water temperature Ts is equal to or higher than the reference water temperature Ta (step S206). As the reference water temperature Ta, the temperature of the cooling water in the engine cooling water passage 10 at the completion of warming up of the internal combustion engine is set. If it is determined in step S206 that the estimated water temperature Ts is lower than the reference water temperature Ta (step S206: NO), it can be determined that the internal combustion engine has not been warmed up. The process of step S205 and step S206 is repeated without shifting.

  Thereafter, when an appropriate time elapses after the operation of the internal combustion engine is started and the amount of heat generated by the engine body 100 after the initial water temperature is detected increases, the estimated water temperature Ts becomes equal to or higher than the reference water temperature Ta. Thus, an affirmative determination is made in the process of step S206 (step S206: YES). The warm-up determination unit 52 determines that the warm-up of the internal combustion engine is completed when an affirmative determination is made in the process of step S206. When the warm-up determination unit 52 determines that the internal combustion engine has been warmed up, the control unit 51 resumes the operation of the electric pump 31. In this case, the thermostat 30 is opened, and the engine coolant flow path is established through the branch path 40, the EGR path 24, and the heater path 25 by controlling the drive amount of the electric pump 31 according to the operating state of the internal combustion engine. The amount of cooling water supplied to 10 is adjusted. Then, a series of processes related to the start-up warm-up control is completed.

The effect of the vehicle cooling device of this embodiment will be described.
During operation of the internal combustion engine, the temperature of the engine body 100 becomes high. Therefore, the temperature of the cooling water in the engine cooling water passage 10 remaining in the engine body 100 is increased by the heat received from the engine body 100 while the internal combustion engine in which the operation of the electric pump 31 is stopped is stopped. There is also. Therefore, when the operation of the internal combustion engine is started, there may be a temperature difference between the cooling water in the engine cooling water passage 10 and the cooling water passage 20 outside the engine.

  In the present embodiment, when the operation of the internal combustion engine is started, the warm-up control at the start is executed, and the water flow treatment for operating the electric pump 31 is started. As a result, cooling water is supplied from the engine cooling water passage 20 to the engine cooling water passage 10. Then, when the amount of the supplied cooling water reaches the second capacity, the operation of the electric pump 31 is stopped. As a result, all the cooling water remaining in the engine cooling water passage 10 in the engine main body 100 is discharged to the engine cooling water passage 20, and all the cooling water in the engine cooling water passage 10 is replaced, and the engine outside cooling is performed. Cooling water supplied from the water passage 20 to the engine cooling water passage 10 in the engine main body 100 flows to the water temperature sensor 23. Further, since the capacity of the portion through which the coolant flows during the water flow treatment in the outside cooling water passage 20 is equal to or larger than the second capacity, the operation of the electric pump 31 causes the outside cooling water passage from the engine cooling water passage 10 to operate. The cooling water discharged to 20 is not returned to the engine cooling water passage 10 again. The cooling water that has flowed to the water temperature sensor 23 and the cooling water supplied to the engine cooling water passage 10 are low-temperature cooling water that has remained in the engine cooling water passage 20 before the operation of the internal combustion engine is started. . Therefore, the correlation between the temperature of the cooling water detected by the water temperature sensor 23 and the cooling water temperature of the entire cooling water passage 10 in the engine is increased, and the temperature difference is reduced. When the operation of the electric pump 31 is stopped, the warm-up determination unit 52 has a high correlation between the temperature of the cooling water detected by the water temperature sensor 23 and the overall cooling water temperature of the engine cooling water passage 10 as described above. The warm-up determination is performed using the cooling water temperature (initial water temperature).

  As described above, in the present embodiment, the water flow treatment for operating the electric pump 31 is started from the time when the operation of the internal combustion engine is started, and the engine internal coolant is discharged from the engine external coolant passage 20 until the second capacity is reached. Cooling water is passed through the passage 10. As a result, even when the temperature difference between the cooling water in the engine cooling water passage 10 and the cooling water passage 20 outside the engine occurs when the operation of the internal combustion engine is started, the cooling water is more than necessary. It is possible to increase the correlation between the temperature of the cooling water detected by the water temperature sensor 23 and the temperature of the cooling water in the engine cooling water passage 10. Therefore, the operation of the electric pump 31 can be suppressed as much as possible, and the function of promoting warm-up of the internal combustion engine can be sufficiently exhibited. Further, all the cooling water in the engine cooling water passage 10 is replaced, and the cooling water supplied from the engine cooling water passage 20 to the engine cooling water passage 10 in the engine main body 100 is allowed to flow to the water temperature sensor 23. . Therefore, the accuracy of the warm-up determination can be improved by increasing the correlation between the coolant temperature in the engine coolant passage 10 and the initial water temperature detected by the water temperature sensor 23.

The above embodiment can be implemented with the following modifications.
In the above embodiment, the operation of the electric pump 31 by the water flow treatment is continued until the cooling water supply amount Wt reaches the second capacity in the start-up warm-up control. Instead of such a configuration, the electric pump 31 by the water flow treatment is used until the cooling water supply amount Wt reaches the first capacity obtained by adding the capacity of the head-side water jacket 12 and the capacity of the region R in the engine outside cooling water passage 20. The operation may be continued.

  When the operation of the internal combustion engine is started, the cooling water staying in the cylinder head 102 may not only be relatively high in temperature, but also increase in the temperature of the cooling water due to heat received from the cylinder head 102 in the engine body 100. Is also likely to occur. Therefore, it is desirable that the temperature of the cooling water (initial water temperature) used for the warm-up determination has a high correlation with at least the temperature of the head-side water jacket 12. In the start-up warm-up control, the cooling water for the first capacity obtained by adding the capacity of the head-side water jacket 12 and the capacity of the region R in the cooling water passage 20 outside the engine is caused to flow from the head-side water jacket 12 to the engine. Cooling water having a relatively high temperature is discharged into the outer cooling water passage 20. Then, the cooling water remaining in the block-side water jacket 11 is caused to flow to the head-side water jacket 12 and the water temperature sensor 23. Thereby, the correlation between the temperature of the cooling water detected by the water temperature sensor 23 and the temperature of the cooling water in the head-side water jacket 12 can be increased. Therefore, in this configuration, it is possible to reduce the amount of cooling water supplied to the in-engine cooling water passage 10 as compared with the above-described embodiment, and to sufficiently exhibit the warm-up promoting function of the internal combustion engine. The accuracy of the warm-up determination can be improved by increasing the correlation between the initial water temperature used for the determination and the temperature of the cooling water in the head-side water jacket 12.

  Furthermore, the supply amount Wt of the cooling water is set to the predetermined amount between the first capacity and the second capacity, and the operation of the electric pump 31 by the water flow treatment is continued until the predetermined amount is reached. You may do it. In this case, the operation of the electric pump 31 can be stopped earlier as the predetermined amount is smaller, and as the predetermined amount is larger, the initial water temperature detected by the water temperature sensor 23 and the engine cooling water passage 10 Correlation can be increased. That is, the predetermined amount can be arbitrarily set within a range in which the first capacity is the lower limit and the second capacity is the upper limit.

  Although the start-up warm-up control is executed every time the ignition switch 62 is turned on, it need not always be executed every time the on-operation is performed. For example, when a certain amount of time has elapsed since the internal combustion engine stopped, the temperature difference between the cooling water in the engine cooling water passage 10 and the engine cooling water passage 20 may decrease. In such a case, it is not necessary to start the operation of the electric pump 31 when the operation of the internal combustion engine is started, and after performing the warm-up determination using the coolant temperature when the operation of the internal combustion engine is started. The operation of the electric pump 31 may be started. In addition to the stop time of the internal combustion engine, for example, the internal combustion engine is stopped as a parameter for determining that the temperature difference between the cooling water in the engine internal coolant passage 10 and the external coolant passage 20 is small. The amount of heat of the engine main body 100 at the time can be employed.

  -The structure of the cooling water passage 20 outside an engine is not restricted to what was mentioned above. For example, any one of the EGR path 24 and the heater path 25 may be omitted. In addition to or instead of the EGR path 24 and the heater path 25, a cooling path different from these cooling paths may be provided. Even in such a configuration, the capacity of the portion through which the cooling water flows during the water flow treatment in the engine outside cooling water passage 20 is set to the second capacity or more.

  In the start-up warm-up control, when the operation of the electric pump 31 is stopped, the high-temperature coolant discharged from the engine coolant passage 10 remains in the heater core 26B and the ATF warmer 27B in the heater passage 25. The supply amount Wt of the cooling water may be set so as to be in the state, or the flow path configuration of the engine outside cooling water passage 20 may be designed. According to such a configuration, after the operation of the internal combustion engine is started, it becomes easy to quickly raise the temperature of the lubricating oil of the transmission and to heat the passenger compartment. Even in this configuration, the supply amount Wt is set in a range where the first capacity is the lower limit and the second capacity is the upper limit.

  The pump that supplies the cooling water from the engine cooling water passage 20 to the engine cooling water passage 10 is not limited to the electric pump 31 described above. For example, an engine-driven pump that is driven by an output shaft of an internal combustion engine, and a pump having a clutch between the drive shaft of the engine-driven pump and the output shaft of the internal combustion engine may be employed. In such an engine-driven pump, the operation is started by engaging the clutch, and the operation is stopped by releasing the engagement of the clutch.

  DESCRIPTION OF SYMBOLS 10 ... Engine cooling water passage, 11 ... Block side water jacket, 12 ... Head side water jacket, 20 ... Outside engine cooling water passage, 21 ... Discharge main passage, 22 ... Supply main passage, 23 ... Water temperature sensor, 24 ... EGR Path, 24A ... EGR cooler, 24B ... Switching valve cooling section, 24C ... Control valve cooling section, 25 ... Heater path, 26 ... First passage, 26A ... First solenoid valve, 26B ... Heater core, 27 ... Second passage, 27A 2nd solenoid valve, 27B ... ATF warmer, 28 ... Junction passage, 30 ... Thermostat, 31 ... Electric pump, 40 ... Branch passage, 41 ... Radiator, 42 ... Reserve tank, 50 ... Control device, 51 ... Control unit, 52 ... Warm-up determination unit, 60 ... Accelerator sensor, 61 ... Rotational speed sensor, 62 ... Ignition switch, 63 ... Temperature switch, 64 ... Oil temperature sensor, 10 ... engine body, 101 ... cylinder block, 102 ... cylinder head.

Claims (1)

A cooling water passage for cooling an engine body composed of a cylinder block and a cylinder head, wherein a cooling water is supplied from the block side water jacket formed in the cylinder block and the block side water jacket formed in the cylinder head. A cooling water passage in the engine having a head-side water jacket,
One end is connected to the outlet of the head-side water jacket and the other end is connected to the inlet of the block-side water jacket, and the cooling water discharged from the head-side water jacket is supplied to the block-side water jacket. A cooling water passage outside the engine,
A water temperature sensor that is provided in the cooling water passage outside the engine and detects the temperature of the cooling water;
A pump provided in the outside engine coolant passage, and supplying coolant from the outside engine coolant passage to the inside engine coolant passage;
A control unit for controlling the pump;
A warm-up determination unit that performs a warm-up determination as to whether or not the warm-up of the internal combustion engine has been completed based on the coolant temperature detected by the water temperature sensor,
The control unit starts a water flow process for operating the pump from the time when the operation of the internal combustion engine is started, and supplies the cooling water supplied from the external cooling water passage to the internal cooling water passage. When the engine reaches a predetermined amount, the operation of the pump is stopped and the water flow treatment is stopped, and then the operation of the pump is performed when the warm-up determination unit determines that the warm-up of the internal combustion engine is completed. Is to resume,
The warm-up determination unit performs the warm-up determination using the coolant temperature when the operation of the pump is stopped,
The predetermined amount is a lower limit of a first capacity obtained by adding a capacity of the head side water jacket and a capacity from the one end of the cooling water passage outside the engine to a detection position where the water temperature sensor is provided, The second capacity obtained by adding the capacity of the entire inner cooling water passage and the capacity from the one end to the detection position in the outer cooling water passage is the upper limit,
A cooling device for a vehicle, wherein a capacity of a portion where the cooling water flows during the water flow treatment in the cooling water passage outside the engine is equal to or more than the second capacity.

Images