JP2012021422A - Cooling device of on-vehicle internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote warm-up of an internal combustion engine securing heating performance when starting the engine, in the internal combustion engine having a vehicle interior heating device for warming air introduced in the vehicle interior through exchanging heat with cooling water.SOLUTION: A cooling device of the internal combustion engine 10 mounted on a vehicle has a heating device 30 including a heater core 32 for raising a temperature of air in a vehicle interior by heat of the cooling water of a circulating water path 20 and warm-up promotion processing is performed for limiting the discharge quantity of a pump 23 to the circulating water path 20 when an engine water temperature θe is less than the upper limited temperature θc. The warm-up promotion processing is interrupted and the pump 23 is driven when the heating requirement of the heating device 30 is applied during performing the warm-up promotion processing. Then, operation of the pump 23 is stopped and the warm-up promotion processing is restarted when a pump control device determines completion of transfer of the cooling water of a water jacket 13 to the heater core 32.

Description

  The present invention relates to a cooling device for an onboard internal combustion engine, and in particular, a vehicle interior heating device that blows air heated by the heat of cooling water into the vehicle interior, and a discharge amount of cooling water from the pump when the engine is cold. The present invention relates to a cooling device for an in-vehicle internal combustion engine comprising a pump control device that performs the above-described operation.

  Conventionally, a vehicle is equipped with a vehicle compartment heating device that heats the vehicle interior by introducing air that has been heated by heat generated in the engine combustion chamber into the vehicle interior. Such a vehicle compartment heating device has a heater core that functions as a heat radiator and is provided in the middle of a circulating water channel through which cooling water circulates, and performs heat exchange between the cooling water and air in the heater core. The vehicle interior is heated by blowing the heated air into the vehicle interior.

  In recent years, as described in Patent Document 1, as a pump for circulating cooling water in a circulating water passage of an internal combustion engine, an electric rotary pump is employed instead of a conventional engine-driven pump. A device has been proposed. In such a cooling device, when the temperature of the cooling water staying around the engine combustion chamber (water jacket) is low, the pump is stopped until this temperature reaches a predetermined temperature, and the circulation of the cooling water in the internal combustion engine is prohibited. By reducing the cooling capacity, a process for promoting warm-up of the internal combustion engine (hereinafter referred to as “warm-up promotion process”) is executed. And even when the engine is cold, the cooling water staying around the engine combustion chamber becomes high temperature due to the heat generated in the combustion chamber, so that warm-up can be promoted, heat loss is reduced, As a result, fuel consumption can be improved.

  However, when such warm-up promotion processing is executed in a vehicle including the above-described vehicle compartment heating device, the following problem occurs. That is, during the warm-up promotion process, the temperature of the cooling water staying around the engine combustion chamber rises, but the cooling water staying in other parts such as the heater core is maintained at a low temperature. For this reason, even when there is a heating request from the passenger compartment heating device during execution of such warm-up promotion processing, the cooling water in the heater core is in a low temperature state. Will be introduced.

  Therefore, for example, in the invention described in Patent Document 1, if there is a heating request of the vehicle compartment heating device during execution of the warm-up promotion process, the warm-up promotion process is terminated and the pump is shifted to normal operation. Cooling water whose temperature has increased around the engine combustion chamber flows into the heater core.

JP 2007-016718 A

However, if the warming-up promotion process is terminated when there is a heating request for the passenger compartment heating device as described above, the following problem occurs.
That is, when the warm-up promotion processing is finished and the pump is started, the cooling water whose temperature has risen around the engine combustion chamber flows into the heater core, but then the low-temperature cooling that remains in other parts of the circulation channel Water comes in. For this reason, although the air heated by the heater core is temporarily introduced into the passenger compartment, the temperature of the introduced air thereafter decreases. Generally, unlike the case where the air temperature of the heating device gradually increases, if the air temperature is once decreased and then greatly decreased again, the passenger will feel uncomfortable. Furthermore, since the mixing of the cooling water whose temperature has increased around the engine combustion chamber and the low-temperature cooling water staying in other parts of the circulation water channel is promoted, the cooling water in the circulation water channel including the engine combustion chamber and the heater core, etc. The temperature becomes uniform. For this reason, the temperature of the cooling water around the engine combustion chamber also decreases, the period required for warming up the internal combustion engine becomes longer, and the warming-up promoting effect by executing the warming-up promoting process cannot be sufficiently exhibited. .

  The present invention has been made based on the above-described problems, and an object of the present invention is to provide an internal combustion engine having a vehicle compartment heating device that raises the temperature of air introduced into the vehicle compartment through heat exchange with cooling water. An object of the present invention is to provide a cooling device for an in-vehicle internal combustion engine capable of promoting warm-up of the internal combustion engine while ensuring the heating capacity when cold.

In the following, means for achieving the above object and its effects are described.
According to the first aspect of the present invention, the temperature of the cooling water around the engine combustion chamber is monitored by monitoring the temperature of the cooling water around the engine combustion chamber, and the vehicle interior heating device having a heater core that raises the temperature of the air in the vehicle interior by the heat of the cooling water in the circulation channel In a cooling device for an on-vehicle internal combustion engine, comprising: a pump control device that controls the pump so as to execute a warm-up promoting process for limiting a discharge amount of the pump to the circulation water channel when the engine water temperature is lower than a predetermined upper limit temperature The pump controller cools the engine combustion chamber by temporarily interrupting the warm-up promotion process when there is a heating request from the passenger compartment heating device and releasing the restriction on the pump discharge amount. The gist is to determine whether or not water has been transferred to the heater core and restart the warm-up promotion processing based on a determination result indicating that the transfer has been completed.

  In this configuration, when there is a heating request from the passenger compartment heating device during execution of the warm-up promotion process, the warm-up promotion process is temporarily interrupted to release the restriction on the pump discharge amount. And the restriction | limiting concerning the discharge amount of a pump is cancelled | released in this way, The cooling water around the engine combustion chamber which raised the temperature by the heat of the engine combustion chamber is transferred to a heater core. For this reason, in the heater core, the temperature of the air blown into the vehicle interior can be raised using the heat of the cooling water whose temperature has increased. The warm-up promotion process is resumed when the transfer of the cooling water to the heater core is completed. For this reason, the cooling water in the circulating water passage including the surroundings of the engine combustion chamber and the heater core is not mixed and the temperature thereof becomes uniform, and the temperature of the cooling water around the engine combustion chamber may be unnecessarily lowered. Absent. Therefore, according to the said structure, warming-up of an internal combustion engine can be accelerated | stimulated, ensuring the heating capability at the time of engine cold.

  According to a second aspect of the present invention, in the on-vehicle internal combustion engine cooling device according to the first aspect, the pump control device has a total discharge amount of the pump after temporarily suspending the warm-up promoting process, The gist is to determine that the transfer of the cooling water has been completed based on the portion of the circulating water channel that extends from the periphery of the engine combustion chamber to the heater core and the total amount of cooling water that can stay in the heater core.

According to this configuration, it is possible to determine with high accuracy that the transfer of the cooling water around the engine combustion chamber to the heater core has been completed.
According to a third aspect of the present invention, there is provided a cooling system for an on-vehicle internal combustion engine according to the first or second aspect, wherein the pump control device is a series of processes from temporarily interrupting the warm-up promotion processing to restarting the warm-up promotion processing. This process is repeatedly executed, and the gist is to execute the process again on condition that a predetermined period has elapsed after the series of processes is completed.

  As described above, the cooling water that has been transferred from the periphery of the engine combustion chamber to the heater core and accumulated in the heater core raises the temperature thereof through heat exchange with the air blown from the heater blower. The heat exchange between the air and the cooling water causes the temperature of the cooling water staying in the heater core to gradually decrease. That is, the heating capacity of the passenger compartment heating device gradually decreases. In this regard, according to the same configuration, since the series of processes from the temporary interruption of the warm-up promotion process to the resumption is repeatedly performed, even if the temperature of the cooling water in the heater core decreases, The cooling water around the engine combustion chamber is again transferred to the heater core. Therefore, the heating capacity of the passenger compartment heating device can be appropriately maintained.

  Further, when repeatedly executing the series of processes from temporarily interrupting the warm-up promotion process to restarting the process, it is a condition that a predetermined period has elapsed since the series of processes was completed. The same process is executed again. Here, the predetermined period may be a fixed value set in advance. However, in order to more appropriately secure the function of the passenger compartment heating device, the warm-up promotion process is performed as described in claim 4. It is desirable to set the period until the temperature decrease amount of the cooling water staying in the heater core after restarting reaches a predetermined amount as the predetermined period. The temperature drop amount of the cooling water staying in the heater core is, for example, the capacity of the heater core and the temperature of the cooling water when the cooling water around the engine combustion chamber is transferred to the heater core, and the blower blow rate after the transfer (after transfer) The total air volume integrated value) can be estimated. It should be noted that the predetermined amount relating to the temperature drop amount is desirably set as an amount that can be experienced by the passenger when the temperature of the warm air introduced from the vehicle compartment heating device into the vehicle compartment drops.

  According to a fifth aspect of the present invention, in the cooling device for an on-vehicle internal combustion engine according to any one of the first to fourth aspects, the pump control device is monitored when there is a heating request for the vehicle compartment heating device. The gist of the present invention is that the temperature of the cooling water is equal to or higher than a predetermined temperature as a start condition for executing a series of processes from the interruption of the warm-up promotion process to the restart thereof.

  According to this configuration, since the temperature of the cooling water around the engine combustion chamber is low, even if it is transferred to the heater core, it is unlikely that the desired heating capacity will be obtained, but rather the temperature of the cooling water around the engine combustion chamber. When there is a concern about an increase in heat loss due to a decrease in temperature, a series of processes for resuming the warm-up acceleration process from the interruption is not started. For this reason, it is possible to avoid that the warm-up promotion process is unnecessarily interrupted and the effect of the warm-up promotion process is reduced by executing such a series of processes.

  According to a sixth aspect of the present invention, in the on-vehicle internal combustion engine cooling device according to any one of the first to fifth aspects, the pump control device temporarily interrupts the warm-up promoting process to The gist is to set the discharge amount of the pump to a predetermined amount smaller than the maximum amount when releasing the restriction on the discharge amount.

  In order to appropriately transfer the cooling water whose temperature has increased around the engine combustion chamber to the heater core, it is desirable to appropriately manage the period required from when the warm-up promoting process is interrupted to when it is restarted. That is, if the period management cannot be performed properly, the warm-up promoting process is resumed before the cooling water around the engine combustion chamber is transferred to the heater core, or the cooling water around the engine combustion chamber is transferred to the heater core. There is a concern that the cooling water will continue to circulate in the circulating water channel even after the operation has been performed. However, for example, when the warming-up promotion processing is temporarily interrupted to release the pump discharge limit, the cooling water around the engine combustion chamber is transferred to the heater core when the pump discharge amount is set to the maximum amount. Since the period until transfer is shortened, it is necessary to more appropriately manage the period until the cooling water around the engine combustion chamber is transferred to the heater core. That is, the inconvenience as described above becomes obvious only when the actual transfer period is slightly different from the target period required for the cooling water transfer.

  In this regard, according to the same configuration, when the warm-up promotion process is temporarily interrupted and the restriction on the pump discharge amount is released, the discharge amount of the pump is set to a predetermined amount smaller than the maximum amount. Therefore, the period until the cooling water around the engine combustion chamber is transferred to the heater core is lengthened, and this period can be appropriately managed.

  The invention according to claim 7 is the cooling device for the on-vehicle internal combustion engine according to any one of claims 1 to 6, wherein the internal combustion engine has a heat exchanger different from the heater core of the vehicle compartment heating device. The gist of the present invention is that the heat exchanger is provided in a portion other than the circulation water channel from the periphery of the engine combustion chamber to the heater core.

  According to this configuration, since there is no other heat exchanger between the engine combustion chamber and the heater core in the circulation channel, the distance between them can be shortened as much as possible, and the temperature rises around the engine combustion chamber. When the cooling water is transferred to the heater core, the transfer amount can be reduced. For this reason, it can be avoided that the temperature of the cooling water around the engine combustion chamber is largely decreased due to temporarily interrupting the warm-up promotion process, and the decrease in the warm-up promotion function can be suppressed. Moreover, since the temperature of the cooling water around the engine combustion chamber does not decrease due to heat exchange by other heat exchangers before reaching the heater core, the heating capacity of the passenger compartment heating device is also reduced. Can be suppressed.

  The invention according to claim 8 is the cooling system for an on-vehicle internal combustion engine according to any one of claims 1 to 7, wherein the pump is an electric rotary pump using an electric motor as a drive source, and the pump control The apparatus controls the rotational speed of the electric motor through a drive signal set based on the target discharge amount of the pump, and increases the target discharge amount as the temperature of the cooling water around the engine combustion chamber is lower. The driving signal is corrected in such a manner that the driving signal is corrected.

  By the way, in the electric rotary pump, basically, the higher the rotation speed, the larger the discharge amount of the pump. However, since the viscosity increases when the temperature of the cooling water is low, the stirring resistance when the pump is rotated increases, and the actual discharge amount of the pump decreases with respect to the target discharge amount. . That is, since the transfer speed when transferring the cooling water around the engine combustion chamber is lowered, the warm-up promoting process may be resumed before the transfer of the cooling water around the engine combustion chamber to the heater core is completed. There is. In this respect, according to the same configuration, the drive signal is corrected in such a manner that the target discharge amount increases as the temperature of the cooling water around the engine combustion chamber is lower. Even in such a case, the cooling water whose temperature has increased around the engine combustion chamber can be reliably transferred to the heater core, and as a result, a desired heating capacity can be ensured in the passenger compartment heating device.

The schematic block diagram which shows the cooling device of the internal combustion engine concerning embodiment of this invention. The flowchart which shows the process sequence about the control of the pump in the period from the time of engine starting to the completion of warm-up promotion process. The map which shows the relationship between the target discharge amount and duty ratio of a pump, and engine water temperature. The map which shows the relationship between engine water temperature and ventilation volume, and a predetermined period. The timing chart which shows an example of those changes about (a) engine water temperature and heater core water temperature, (b) the operating state of a heating apparatus, and (c) the operating state of a pump.

Hereinafter, a cooling apparatus for an in-vehicle internal combustion engine according to an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, an engine combustion chamber 14 is defined in an internal combustion engine 10, specifically, a cylinder block 11 and a cylinder head 12. Further, in the cylinder block 11 and the cylinder head 12, a water jacket 13 through which cooling water circulates is formed around the engine combustion chamber 14. A water temperature sensor 92 for detecting the temperature of the cooling water is attached to the cylinder head 12 at the most downstream side of the water jacket 13. In the cooling device, the temperature of the cooling water detected by the water temperature sensor 92 is used as an alternative value of the temperature of the cooling water staying around the engine combustion chamber 14, that is, in the water jacket 13 (hereinafter referred to as “engine water temperature θe”). .

  The circulating water channel 20 of the cooling device is largely branched from the water jacket 13, a radiator passage 22 for returning cooling water flowing out from the water jacket 13 to the thermostat 24 via the radiator 25, and the radiator passage 22. The bypass 25 is connected to the thermostat 24 so as to bypass the radiator 25, and the bypass passage 21 returns the cooling water flowing out from the water jacket 13 directly to the thermostat 24.

  The thermostat 24 adjusts the flow rate of the cooling water flowing through the radiator passage 22 according to the opening degree. That is, when the temperature of the cooling water in contact with the temperature sensing portion of the thermostat 24 is lower than the valve opening temperature, the thermostat 24 is in a closed state, so that the cooling water flowing out of the water jacket 13 flows into the radiator 25. All flow into the bypass passage 21 without any change. On the other hand, when the temperature of the cooling water in contact with the temperature sensing portion of the thermostat 24 becomes higher than the valve opening temperature, the thermostat 24 is opened, so that the cooling water flowing out of the water jacket 13 is added to the bypass passage 21 and the radiator. 25 also flows in. The cooling water flowing into the radiator 25 in this way is cooled through heat exchange with the outside air.

  A pump 23 for circulating cooling water through the circulation channel 20 is provided in the middle of the circulation channel 20. The pump 23 is an electric rotary pump that uses a motor (not shown) as a drive source. The higher the rotational speed of the motor, that is, the rotational speed of the pump 23, the greater the discharge amount. The rotational speed of the pump 23 is controlled by changing the motor drive signal, specifically, the duty ratio D of the voltage supplied to the motor (ratio of voltage application time per predetermined time). Therefore, the larger the duty ratio D, the larger the power supplied to the pump 23 and the greater the amount of cooling water discharged by the pump 23.

  Further, the internal combustion engine 10 is provided with a vehicle compartment heating device (hereinafter referred to as “heating device 30”). The heating device 30 is provided in the middle of the bypass passage 21 and has a heater core 32 having a function as a radiator, a heater blower 33 for blowing air to the heater core 32, and a duct for introducing the blown air into the vehicle interior (FIG. Not shown), and the occupant has various operation sections 93 for setting the heating temperature and the air volume. The cooling water of the heater core 32 raises its temperature through heat exchange with the air blown from the heater blower 33. The heating device 30 heats the vehicle interior by introducing the air whose temperature has increased in this way into the vehicle interior.

  On the other hand, the internal combustion engine 10 is provided with various sensors including the water temperature sensor 92 described above. The control device 91 that captures the detection signals of these sensors executes various controls such as control of the pump 23 and the heating device 30 based on the detection results.

  Further, the control device 91 monitors the engine water temperature θe from the start of the engine, and when the engine water temperature θe is lower than a predetermined temperature (hereinafter referred to as “upper limit water temperature θc”), the operation of the pump 23 is stopped and the circulation water channel is stopped. A process for stopping the circulation of the cooling water at 20 (hereinafter referred to as “warm-up promotion process”) is executed. This upper limit water temperature θc is based on a comparison with the engine water temperature θe that the internal combustion engine 10 is not sufficiently warmed up and there is no need to circulate cooling water to cool the internal combustion engine 10. This is a value for determination. That is, when the engine water temperature θe is lower than the upper limit water temperature θc, it is not necessary to cool the internal combustion engine 10 by circulating the cooling water, so the warm-up promotion process is executed. And since such a warming-up promotion process is performed, the cooling capacity of the cooling device is reduced, so that the warming-up of the internal combustion engine 10 is promoted.

  By the way, when there is a heating request of the heating device 30 during the execution of the warm-up promotion process, when the heater blower 33 is driven, low-temperature air that is not heated by the heater core 32 is introduced into the vehicle interior. become. Therefore, in order to avoid such a situation, when there is a heating request of the heating device 30, when the pump 23 is shifted to normal operation, after the heated air is once introduced into the passenger compartment, the low-temperature air is blown again. As described above, the passengers feel uncomfortable. Furthermore, since the temperature of the cooling water in the circulation water channel 20 including the water jacket 13 and the heater core 32 is made uniform as compared with the case where the warm-up promotion process is executed, the temperature of the cooling water in the water jacket 13 is lowered. As described above, the period required for warming up the internal combustion engine 10 becomes long and the warming-up promotion effect due to the execution of the warm-up promotion process cannot be sufficiently exhibited.

  Therefore, in the present embodiment, when there is a heating request of the heating device 30 during execution of the warm-up promotion process, the warm-up promotion process is temporarily interrupted and the pump 23 is operated, so that the temperature of the water jacket 13 is increased. The raised cooling water is transferred to the heater core 32. Then, when the transfer of the cooling water to the heater core 32 is completed, the warm-up promotion process is restarted and the operation of the pump 23 is stopped.

  Hereinafter, with reference to the flowchart shown in FIG. 2, the control of the pump 23 during the period from the start of the engine to the completion of the warm-up promotion process will be described. 2 is repeatedly executed by the control device 91 with a predetermined time period.

  When this process is started, it is first determined whether or not the engine water temperature θe is lower than the upper limit water temperature θc (step S100). When it is determined that the engine water temperature θe is equal to or higher than the upper limit water temperature θc (step S100: NO), that is, when it is determined that the warm-up of the internal combustion engine 10 is almost complete, it is not necessary to execute the warm-up promotion process. Therefore, the pump 23 shifts to normal operation (step S101). It should be noted that when shifting to the normal operation in this way, the target discharge amount of the pump 23 is set based on the engine operation state such as the engine load and the engine rotation speed, and the duty ratio D generated based on the target discharge amount is set. Based on this, the pump 23 is controlled.

On the other hand, when it is determined that the engine water temperature θe is lower than the upper limit water temperature θc (step S100: YES), it is next determined whether or not there is a heating request for the heating device 30 (step S102).
When it is determined that there is no heating request for the heating device 30 (step S102: NO), the warm-up promotion process is executed as described above, that is, the operation of the pump 23 is stopped to promote the warm-up of the internal combustion engine 10. (Step S113). And this process is once complete | finished. The heating request of the heating device 30 is set based on the operation state of the various operation units 93.

  On the other hand, when it is determined that there is a heating request for the heating device 30 (step 102: YES), it is next determined whether or not the interruption period Ta and the execution period Tb of the warm-up promotion process are “0” (step). S103). In the control of the pump 23 shown in FIG. 2, the heating capacity of the heating device 30 is repeated by repeating the interruption and execution of the warm-up promotion process every predetermined period until the engine water temperature θe reaches the upper limit water temperature θc. While trying to promote warm-up. In step S103, when the warm-up promotion process is repeatedly interrupted and executed in this manner, the warm-up promotion process is being interrupted or being executed, and the warm-up promotion process is performed regardless of the state of the heating device 30. Whether it is executed or not is determined separately. That is, when the suspension period Ta exceeds “0” and the execution period Tb is “0”, the warm-up promotion process is suspended, and both the suspension period Ta and the execution period Tb exceed “0”. When it is, it can be determined that the warm-up promotion process is being executed. Further, when both of the interruption period Ta and the execution period Tb are “0”, the process for repeating the interruption and execution of the warm-up promotion process as described above is not performed every predetermined period. It can be determined that the warm-up promotion process is being executed regardless of the state.

  When it is determined that both the interruption period Ta and the execution period Tb are “0” (step S103: Ta, Tb = 0), it is next determined whether or not the engine water temperature θe is equal to or higher than a predetermined water temperature θs ( Step S104). This predetermined water temperature θs indicates whether or not the temperature of the cooling water in the water jacket 13 has increased to such an extent that a desired heating capacity can be obtained in the heating device 30 when the cooling water in the water jacket 13 is transferred to the heater core 32. This is a value for judging based on a comparison with the engine water temperature θe.

  Here, when it is determined that the engine water temperature θe is lower than the predetermined water temperature θs (step S104: NO), that is, the temperature of the cooling water in the water jacket 13 is low, even if it is transferred to the heater core 32, the heating device 30 If it is determined that the desired heating capacity cannot be obtained, warm-up promotion processing is executed (step S113). That is, in this case, the operation of the pump 23 is stopped, the circulation of the cooling water in the circulation water channel 20 is stopped, and the cooling capacity is reduced, thereby promoting the warm-up of the internal combustion engine 10. After executing the warm-up promotion process in this way, this process is temporarily terminated.

  On the other hand, when it is determined that the engine water temperature θe is equal to or higher than the predetermined water temperature θs (step S104: YES), or the interruption period Ta exceeds “0” and the execution period Tb is “0” in the previous step S103. (Step S103: Ta> 0, Tb = 0), next, until the cooling water whose temperature has risen in the water jacket 13 is reliably transferred to the heater core 32, that is, until the transfer of the cooling water is completed. A process of interrupting the warm-up promotion process and operating the pump 23 (steps S105 to S112: hereinafter referred to as “core heating process”) is executed.

  In this core heating process, first, it is determined whether or not a period that has elapsed since the warm-up promotion process is temporarily interrupted (hereinafter referred to as “warm-up promotion process interruption period Ta”) is less than a predetermined period T1. (Step S105). This predetermined period T1 indicates whether or not the interruption period Ta of the warm-up promotion process has reached a period necessary for completing the transfer of the cooling water staying in the water jacket 13 to the heater core 32. It is a value for judging based on the comparison. More specifically, the total discharge amount of the pump 23 after temporarily suspending the warm-up promotion process is the cooling water that can stay in the portion of the circulating water channel 20 from the water jacket 13 to the heater core 32 and the heater core 32. Is set in advance so that it can be determined that the transfer of the cooling water of the water jacket 13 to the heater core 32 has been completed.

  If it is determined that the interruption period Ta of the warm-up promotion process is less than the predetermined period T1 (step S105: YES), the warm-up promotion process is interrupted or the interrupted state is maintained and the pump 23 is operated (step S105). S106).

  By the way, when the temperature of the cooling water is low, the viscosity becomes high, so that the stirring resistance when the pump 23 is rotated increases, and the actual discharge amount of the pump 23 decreases with respect to the target discharge amount. . That is, the transfer speed when the cooling water whose temperature has been increased by the water jacket 13 is transferred to the heater core 32 is lowered. Therefore, in the present embodiment, referring to the map shown in FIG. 3, the duty ratio D when operating the pump 23 by temporarily interrupting the warm-up promotion process is corrected based on the engine water temperature θe. Yes.

  FIG. 3 is a map showing the relationship between the target discharge amount of the pump 23 and the duty ratio D when the pump 23 is operated and the engine water temperature θe. As shown in FIG. 3, the duty ratio D is corrected so as to increase as the target discharge amount increases and the engine coolant temperature θe decreases. This is because the actual discharge amount of the pump 23 is greatly affected by the viscosity of the cooling water as the target discharge amount is larger and the engine water temperature θe is lower. It should be noted that such correction based on the engine water temperature θe is similarly performed during normal control of the previous pump (step S113).

  In order to appropriately transfer the cooling water of the water jacket 13 to the heater core 32, it is desirable to appropriately manage the interruption period Ta. That is, when the interruption period Ta cannot be properly managed, the warm-up promotion process is resumed before the cooling water of the water jacket 13 is transferred to the heater core 32, or the cooling water of the water jacket 13 is transferred to the heater core 32. After that, there is a concern that the circulation of the cooling water in the circulation water channel 20 may be continued.

  However, when the discharge amount of the pump 23 is set to the maximum amount during the interruption period Ta, the interruption period Ta becomes short, and this must be managed more strictly. That is, the above-described inconvenience becomes apparent only when the actual interruption period is slightly different from the target interruption period Ta. Therefore, in the present embodiment, the discharge amount of the pump 23 in the interruption period Ta is set to an amount smaller than the maximum amount, for example, an amount corresponding to “40%” of the maximum amount.

  The control device 91 operates the pump 23 based on the duty ratio D set in this way (step S106), counts up the interruption period Ta of the warm-up promotion process (interruption period Ta ← warm-up of the warm-up promotion process) After the machine promotion process interruption period Ta + ΔTa) (step S107), this process is temporarily terminated.

  On the other hand, when it is determined that the interruption period Ta of the warm-up promotion process is equal to or longer than the predetermined period T1 (step S105: NO), that is, when it is determined that the cooling water of the water jacket 13 is transferred to the heater core 32, Resume the promotion process. That is, first, it is determined whether or not a period that has elapsed since the warm-up promotion process is resumed (hereinafter referred to as “warm-up promotion process execution period Tb”) is less than a predetermined period T2 (step S108). Similarly, when the warm-up promotion processing interruption period Ta and the execution period Tb both exceed “0” in the previous step S103 and it is determined that the warm-up promotion processing is already being executed (step S103). S103: Ta> 0, Tb> 0), it is determined whether or not the execution period Tb is less than the predetermined period T2 (step S108).

  As described above, the temperature of the cooling water transferred from the water jacket 13 to the heater core 32 gradually decreases through heat exchange with the air blown by the heater blower 33. That is, the heating capacity of the heating device 30 gradually decreases. Therefore, in the present embodiment, the period during which the temperature of the cooling water of the heater core 32 is in a temperature range in which the heating capacity of the heating device 30 can be appropriately secured, that is, the amount of decrease in the temperature of the cooling water of the heater core 32 is described above. A period that is less than or equal to the fixed amount is defined as a predetermined period T2. Then, based on a comparison between the predetermined period T2 and the warming-up promotion process execution period Tb, is the temperature of the cooling water in the heater core 32 within a temperature range in which the heating capacity of the heating device 30 can be appropriately secured? Judgment is made whether or not. The predetermined period T2 is calculated with reference to the map shown in FIG.

  FIG. 4 is a map showing the relationship between the engine water temperature θe, the total blown amount of the heater blower 33, and the predetermined period T2. The total blower amount of the heater blower 33 is an integrated value of the blower amount of the heater blower 33 after the warm-up promotion process is started. As shown in FIG. 4, the predetermined period T2 is set to be longer as the engine water temperature θe is higher and the total blown amount of the heater blower 33 is smaller. This is because the higher the engine water temperature θe and the smaller the total blown amount of the heater blower 33, the smaller the amount of temperature drop in the cooling water of the heater core 32, and the less the influence on the heating capacity reduction of the heating device 30.

  In this determination process, when it is determined that the execution period Tb of the warm-up promotion process is less than the predetermined period T2 (step S108: YES), that is, the temperature of the cooling water in the heater core 32 is sufficient for the heating capacity of the heating device 30. If it is determined that it has been secured, warm-up promotion processing is executed (step S109). That is, the operation of the pump 23 is stopped, and the circulation of the cooling water in the circulation water channel 20 is stopped. After the warm-up promotion process execution period Tb is counted up (warm-up promotion process execution period Tb ← warm-up promotion process execution period Tb + ΔTb) (step S110), this process is temporarily terminated.

  On the other hand, when it is determined that the execution period Tb of the warming-up promotion process is equal to or longer than the predetermined period T2 (step S108: NO), that is, the temperature of the cooling water in the heater core 32 decreases, thereby heating the heating device 30. When it is determined that the capability has decreased to a level that cannot be ignored, the warm-up promotion processing execution period Tb is set to “0” and cleared (step S111). Further, the interruption period Ta of the warm-up promotion process is similarly set to “0” and cleared (step S112). After clearing the execution period Tb and the interruption period Ta of the warm-up promotion process in this way, this process is temporarily terminated.

  FIG. 5A shows the transition of the engine water temperature θe when the control of the pump 23 is executed during the period from the start of the engine to the completion of the warm-up promotion process, with the solid line showing the temperature of the cooling water in the heater core 32. The transition of the estimated value (hereinafter referred to as “heater core water temperature θh”) is indicated by a one-dot chain line. Moreover, the figure (b) has shown the transition of the driving | running state of the heating apparatus 30, and the figure (c) has each changed transition of the driving | running state of the pump 23. FIG. In FIG. 9A, when there is a heating request of the heating device 30 and the engine water temperature θe is equal to or higher than the predetermined water temperature θs, the warm-up promotion process is terminated and the pump 23 shifts to the normal operation. The transition of the engine water temperature θe and the heater core water temperature θh in this case is indicated by a two-dot chain line.

  For example, when the engine water temperature θe is low, such as when the elapsed time from the start of the engine is short, the operation of the pump 23 is stopped and the warm-up promotion process is executed as shown in FIG. (When the engine is started to timing t1). During this period, the engine water temperature θe rises due to the heat of the engine combustion chamber 14, while the heater core water temperature θh is maintained at a low temperature. Then, when there is a heating request of the heating device 30 by operating various operation units 93 (timing t1), the engine water temperature θe is lower than the predetermined water temperature θs, so the warm-up promotion process is continuously executed. The Accordingly, the pump 23 is maintained in a stopped state.

  The engine water temperature θe rises through such warm-up promotion processing, and when this reaches a predetermined water temperature θs, the warm-up promotion processing is temporarily interrupted and the operation of the pump 23 is started (timing t2). When the operation of the pump 23 is started in this way, the cooling water whose temperature has been increased by the heat of the engine combustion chamber 14 flows out of the water jacket 13, so that the engine water temperature θe decreases. On the other hand, since the cooling water whose temperature has been increased by the water jacket 13 flows into the heater core 32 in this way, the heater core water temperature θh is increased.

  Then, when the interruption period Ta of the warm-up promotion process reaches the predetermined period T1, that is, when the transfer of the cooling water of the water jacket 13 to the heater core 32 is completed, the warm-up promotion process is restarted (timing t3). That is, the operation of the pump 23 is stopped as shown in FIG. Thus, when the warm-up promotion process is resumed, the engine water temperature θe rises again. On the other hand, in the heater core 32, since heat exchange is performed between the cooling water and the air, the heater core water temperature θh gradually decreases. Then, when the execution period Tb of the warm-up promotion process reaches the predetermined period T2, the warm-up promotion process is interrupted again, and the operation of the pump 23 is started (timing t4). As a result, as in the case described above, the engine water temperature θe decreases, while the heater core water temperature θh increases. Then, when the transfer of the cooling water is completed again, that is, when the predetermined period T1 has elapsed since the warm-up promotion process is temporarily interrupted, the operation of the pump 23 is stopped and the warm-up promotion process is resumed ( Timing t5).

  Then, by restarting the warm-up promotion process in this way, the engine water temperature θe increases as in the case described above, and when this reaches the upper limit water temperature θc (timing t6), it is shown in FIG. In this way, the warm-up promotion process is terminated and the pump 23 shifts to normal operation. At this time, as shown in FIG. 5A, the engine water temperature θe once decreases due to the low-temperature cooling water staying in the circulation water channel 20 flowing into the water jacket 13, but again due to the heat of the engine combustion chamber 14. To rise. Incidentally, in the process of step S100 shown in FIG. 2, when the relationship of the engine water temperature θe ≧ the upper limit water temperature θc is once satisfied, the process of step S102 is always performed even if this relationship is not satisfied after that. I try to migrate.

  As a comparative example for the present embodiment, when there is a heating request for the heating device 30 and the engine water temperature θe is equal to or higher than the predetermined water temperature θs, the warm-up promotion process is terminated at that time and the pump 23 is shifted to normal operation. Will be described. In this case, since the warm-up promotion process is completed and the pump 23 is shifted to normal operation, the circulation water channel 20 including the water jacket 13 and the heater core 32 is compared with the case where the warm-up promotion process is executed. The temperature of the cooling water at is made uniform.

  Therefore, as indicated by a two-dot chain line in FIG. 5A, the engine water temperature θe gradually decreases (timing t3 to timing 3). On the other hand, the heater core water temperature θh once rises when the cooling water whose temperature has been raised by the water jacket 13 is transferred, but then greatly decreases. The engine water temperature θe and the heater core water temperature θh are both gradually increased by the heat generated in the engine combustion chamber 14. However, the heater core water temperature θh is lower than the engine water temperature θe by heat exchange with the air blown from the heater blower 33. Furthermore, the engine water temperature θe and the heater core water temperature θh are both lower than when the above-described core heating process is performed. That is, in this comparative example, the heating capacity of the heating device 30 is reduced, and the warming-up promotion effect of the internal combustion engine 10 is also reduced.

As described above, according to the present embodiment, the following effects can be achieved.
(1) In this embodiment, when there is a heating request of the heating device 30 during execution of the warm-up promotion process, the engine is operated by the water jacket 13 by temporarily interrupting the warm-up promotion process and operating the pump 23. Cooling water whose temperature has been increased by the heat of the combustion chamber 14 is transferred to the heater core 32. For this reason, in the heater core 32, the temperature of the air introduced into the vehicle interior can be raised using the heat of the cooling water whose temperature has increased. Further, the warm-up promotion process is resumed when the transfer of the cooling water to the heater core 32 is completed. For this reason, the cooling water in the circulating water channel 20 including the water jacket 13 and the heater core 32 is not mixed and the temperature thereof becomes uniform, and the temperature of the cooling water in the water jacket 13 may be lowered more than necessary. Absent. Therefore, warming up of the internal combustion engine can be promoted while ensuring the heating capacity when the engine is cold.

  (2) Further, the total discharge amount of the pump 23 after the warm-up promotion processing is temporarily interrupted is the portion of the circulating water channel 20 from the water jacket 13 to the heater core 32 and the cooling water that can stay in the heater core 32. Since it is determined that the transfer of the cooling water of the water jacket 13 to the heater core 32 is completed based on reaching the total amount, it can be determined with high accuracy that the transfer of the cooling water is completed. .

  (3) Further, the temperature of the cooling water staying in the heater core 32 gradually decreases as heat exchange with the air blown from the heater blower 33 is performed. For this reason, the heating capability of the heating device 30 gradually decreases. In this regard, according to the present embodiment, since the series of processes from temporarily interrupting the warm-up promotion process to restarting it is repeatedly executed, the temperature of the cooling water in the heater core 32 temporarily decreases. Even so, the cooling water of the water jacket 13 whose temperature has been increased by the heat of the engine combustion chamber 14 is transferred to the heater core 32 again. Therefore, the heating capability of the heating device 30 can be appropriately maintained.

  (4) In addition, the predetermined period T2 is variably set based on the engine water temperature θe and the total air blowing amount of the heater blower 33 after the start of the warm-up promotion process. For this reason, it is possible to appropriately estimate a period during which the temperature decrease amount of the cooling water staying in the heater core 32 reaches a predetermined amount after the warm-up promotion process is resumed, that is, the timing at which the heating capacity of the heating device 30 decreases. The heating capability of the heating device 30 can be ensured more appropriately.

  (5) Moreover, since the temperature of the cooling water of the water jacket 13 is low, even if it is transferred to the heater core 32, the desired heating capacity cannot be obtained, but rather the temperature of the cooling water of the water jacket 13 is lowered. When there is a concern about an increase in heat loss, etc., a series of processes related to resumption from the interruption of the warm-up promotion process is prohibited. For this reason, it becomes possible to avoid that the warm-up promotion process is unnecessarily interrupted and the effect of the warm-up promotion process is reduced.

  (6) Further, when the warming-up promotion process is temporarily interrupted to release the restriction on the discharge amount of the pump 23, the discharge amount of the pump 23 is set to be a predetermined amount smaller than the maximum amount. Therefore, the period until the cooling water of the water jacket 13 is transferred to the heater core 32 can be lengthened, and this period can be appropriately managed.

  (7) Further, the duty ratio D is corrected in such a manner that the target discharge amount increases as the engine water temperature θe is lower. For this reason, even when the viscosity of the cooling water is different, the cooling water whose temperature has been increased by the water jacket 13 can be appropriately transferred to the heater core 32, and as a result, the desired heating capacity of the heating device 30 is ensured. Will be able to.

  In addition, the embodiment of the present invention is not limited to the embodiment exemplified in each of the above-described embodiments, and can be implemented by changing it as shown below, for example. The following modifications are not applied only to the above-described embodiments, and can be implemented in a mode in which different modifications are appropriately combined.

  When calculating the duty ratio D corresponding to the target discharge amount of the pump 23, this is corrected according to the engine water temperature θe. However, in the above core heating process, the engine water temperature θe is basically equal to or higher than the predetermined water temperature θs. Therefore, the temperature change region of the engine water temperature θe during the execution of the core heating process is limited. For this reason, when the change in the viscosity of the cooling water due to the temperature change of the engine water temperature θe, that is, the change in the discharge amount of the pump 23 is in a negligible range, the correction of the duty ratio D based on the engine water temperature θe is omitted. You can also

  In the above embodiment, only the heater core 32 is exemplified as the heat exchanger. However, in general, the vehicle is often equipped with a heat exchanger such as an EGR cooler or an exhaust heat recovery unit in addition to the heater core 32. In such a case, it is desirable that these heat exchangers excluding the heater core 32 be provided on the downstream side of the heater core 32. As a result, in the circulation channel 20, the distance between the water jacket 13 and the heater core 32 can be shortened as much as possible, and heat exchange by another heat exchanger is performed until the cooling water of the water jacket 13 reaches the heater core 32. It is possible to suppress the temperature change due to the influence of. For this reason, there is a heating request of the heating device 30, and when the cooling water whose temperature has increased in the water jacket 13 is transferred to the heater core 32, it can be suppressed from decreasing in temperature. The decrease can be suppressed. Further, it is possible to avoid the engine water temperature θe from greatly decreasing due to temporarily interrupting the warm-up promotion process, and it is possible to suppress a decrease in the warm-up promotion function.

  Furthermore, when the warm-up promotion process is temporarily interrupted and the restriction on the discharge amount of the pump 23 is released, the discharge amount of the pump 23 is set to be a predetermined amount smaller than the maximum amount. However, for example, when the amount of cooling water staying between the water jacket 13 and the heater core 32 in the circulation channel 20 and the amount of cooling water staying in the heater core 32 are large, or when the maximum amount applied to the discharge amount of the pump 23 is small, etc. If the transfer period is secured to some extent, the discharge amount of the pump 23 may be set to the maximum amount.

  In the cooling device, the heater blower 33 and the pump 23 of the heating device 30 are collectively controlled by the control device 91, but a control device different from the control device 91 is provided, and the heating device 30 is provided by the control device. May be controlled. In this case, the engine water temperature θe detected by the water temperature sensor 92 is equal to or higher than a predetermined temperature (for example, the predetermined water temperature θs), and the various operation units 93 are in an operation state that requires heating of the passenger compartment. A series of processes shown in FIG. 2 may be executed. However, in this case, each process of step S102, step S104, and step S113 is omitted. Therefore, when there is no heating request from the control device of the heating device 30, the warm-up promotion process is executed. In this case, in the determination process of step S103, when it is determined that the warm-up promotion process is interrupted (step S103: Ta> 0, Tb = 0), the warm-up promotion is performed regardless of the state of the heating device 30. When it is determined that the process is being executed (step S103: Ta, Tb = 0), the process of step S105 is executed in all cases.

The predetermined period T2 may be a fixed value determined in advance through experiments or the like as long as the heating function of the heating device 30 can be ensured.
In the present embodiment and the above modification, the core heating process is repeatedly executed until the engine water temperature θe reaches the upper limit water temperature θc, that is, until the warm-up acceleration process is completed. On the other hand, for example, when the predetermined water temperature θs is set to a relatively high temperature, the heating capacity of the heating device 30 can be secured over a long period of time by transferring the cooling water of the water jacket 13 to the heater core 32 once. In such a case, it is not always necessary to repeat the core heat treatment.

  A water temperature sensor may be attached to the heater core 32 to directly detect the heater core water temperature θh. In this case, when the warm-up promotion process is temporarily interrupted and the operation of the pump 23 is started, the degree of divergence between the engine water temperature θe and the heater core water temperature θh becomes small, and the cooling water whose temperature has increased in the water jacket 13 It is determined that the transfer to the heater core 32 has been completed, and the warm-up promotion process can be resumed. According to this modification, it can be accurately determined that the transfer of the cooling water whose temperature has risen in the water jacket 13 to the heater core 32 has been completed.

  In addition, when the warm-up promotion process is temporarily interrupted and the operation of the pump 23 is started, the cooling water of the water jacket 13 is transferred to the heater core 32, so that the temperature of the water jacket 13, in other words, the water temperature sensor 92 The detected engine water temperature θe temporarily decreases. For this reason, it may be determined that the transfer of the cooling water described above is completed when the engine water temperature θe has decreased by a predetermined amount from the predetermined water temperature θs.

  In the above-described example, the electric rotary pump 23 is employed to variably set the discharge amount. However, for example, an engine-driven pump that has been used in the past can also be employed. However, in this case, a mechanism capable of changing the discharge amount regardless of the rotation speed of the output shaft in the internal combustion engine 10 is separately provided. For example, a pump is employed in which the rotary shaft is drivingly connected to the output shaft of the internal combustion engine 10 via a clutch, and the clutch is switched between a state in which cooling water is discharged and a state in which discharge is stopped by engaging / disengaging the clutch. You can also. In addition, if power transmission from the output shaft of the internal combustion engine 10 can be connected and disconnected, for example, a pulley (not shown) attached to the rotary shaft of the pump is pressed against the belt that travels as the output shaft rotates. This may be done by other connecting / disconnecting mechanisms such as connecting / disconnecting power transmission by separating.

  -In each embodiment including the modification mentioned above, although the process which stops the driving | operation of the pump 23 and stops the circulation of the cooling water in the circulation channel 20 was illustrated as a warming-up promotion process, the warming-up promotion process in this invention is illustrated. Although the pump 23 is driven, for example, a minimum amount of cooling water that does not cause local boiling of cooling water in the water jacket 13 is circulated through the circulation channel 20, and the discharge amount is limited to a predetermined amount or less. Is also included.

  DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 11 ... Cylinder block, 12 ... Cylinder head, 13 ... Water jacket, 14 ... Engine combustion chamber, 20 ... Circulating water passage, 21 ... Detour passage, 22 ... Radiator passage, 23 ... Pump, 24 ... Thermostat, 25 DESCRIPTION OF SYMBOLS ... Radiator, 30 ... Heating apparatus, 32 ... Heater core, 33 ... Heater blower, 91 ... Control apparatus (pump control apparatus), 92 ... Water temperature sensor, 93 ... Various operation parts.

Claims (8)

A vehicle interior heating device having a heater core that raises the temperature of the air in the vehicle interior by the heat of the cooling water in the circulation water channel, and the temperature of the cooling water around the engine combustion chamber is monitored, and the monitored engine water temperature is a predetermined upper limit temperature A cooling system for an on-vehicle internal combustion engine comprising a pump control device for controlling the pump to perform a warm-up promoting process for limiting a discharge amount of the pump to the circulating water channel when
The pump control device temporarily interrupts the warm-up promotion processing when there is a heating request from the vehicle compartment heating device, and releases the restriction on the discharge amount of the pump, thereby cooling water around the engine combustion chamber. It is determined whether or not is transferred to the heater core, and the warm-up promotion processing is restarted based on a determination result indicating that the transfer is completed. The pump control device is configured such that a total discharge amount of the pump after temporarily interrupting the warm-up promoting process is a portion of the circulating water passage from the periphery of the engine combustion chamber to the heater core and cooling that can stay in the heater core. The cooling device for an in-vehicle internal combustion engine according to claim 1, wherein it is determined that the transfer of the cooling water is completed based on reaching the total amount of water. The pump control device repeatedly executes a series of processes from temporarily suspending the warm-up promotion process to resuming the process, on condition that a predetermined period has elapsed since the completion of the series of processes. The cooling apparatus for an in-vehicle internal combustion engine according to claim 1 or 2, wherein the process is executed again. The in-vehicle unit according to claim 3, wherein the pump control device sets the predetermined period as a period until a temperature decrease amount of the cooling water staying in the heater core reaches a predetermined amount after the warm-up promotion process is resumed. Cooling device for internal combustion engine. The pump control device executes a series of processing from the interruption of the warm-up promotion processing to the restart thereof, when the temperature of the monitored cooling water is equal to or higher than a predetermined temperature when there is a heating request of the passenger compartment heating device The in-vehicle internal combustion engine cooling device according to any one of claims 1 to 4, wherein the start condition is a start condition for the on-vehicle internal combustion engine. The pump control device sets the discharge amount of the pump to a predetermined amount smaller than the maximum amount when the warming-up promotion process is temporarily interrupted to release the restriction on the discharge amount of the pump. The cooling device for an in-vehicle internal combustion engine according to claim 5. In the cooling device for an in-vehicle internal combustion engine according to any one of claims 1 to 6,
The internal combustion engine has a heat exchanger different from the heater core of the vehicle compartment heating device,
The heat exchanger is provided in a portion other than the circulating water passage extending from the periphery of the engine combustion chamber to the heater core. The pump is an electric rotary pump that uses an electric motor as a drive source,
The pump control device controls a rotation speed of the electric motor through a drive signal set based on a target discharge amount of the pump, and the target discharge is reduced as the temperature of cooling water around the engine combustion chamber is lower. The cooling device for an on-vehicle internal combustion engine according to any one of claims 1 to 7, wherein the drive signal is corrected in a manner of increasing the amount.

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