JP2010221916A - Vehicle heating system - Google Patents

Abstract

The present invention provides a vehicle heating apparatus capable of ensuring a heating function while suppressing fogging of a window glass and reducing fuel consumption of an in-vehicle internal combustion engine.
The apparatus includes a heater core through which cooling water of an in-vehicle internal combustion engine passes, an inside air passage that guides air inside the passenger compartment (inside air) to the heater core, and air outside the passenger compartment (outside air). An outside air passage that guides the heater core. Heating is performed by heating the air guided through the inside air passage and the outside air passage through heat exchange with cooling water passing through the inside of the heater core and then supplying the air into the passenger compartment. Based on the transmission oil temperature THOT (S101), the engine oil temperature THOE (S102), and the coolant temperature THW (S103), the setting mode of the ratio between the amount of inside air and the amount of outside air is switched (S104, S107).
[Selection] Figure 2

Description

  The present invention relates to a vehicle heating device for heating a passenger compartment.

A vehicle such as an automobile is provided with a heating device for heating the air in the passenger compartment (see, for example, Patent Document 1).
Usually, the heating device includes a heater core through which cooling water of the in-vehicle internal combustion engine passes and a guide passage for guiding air to the heater core. Then, the air guided through the guide passage is heated by heat exchange with the cooling water passing through the heater core, and then supplied to the passenger compartment to perform heating.

  In addition, the heating device includes an inside air passage that guides air in the passenger compartment and an outside air passage that guides air outside the passenger compartment as the guide passage. When heating is performed, air is guided to the heater core through at least one of the inside air passage and the outside air passage. In such a heating device, air is guided to the heater core through the outside air passage when the window glass is fogged or is likely to be fogged. As a result, heating is performed using air outside the passenger compartment, which is lower in humidity than the air inside the passenger compartment, so that the humidity inside the passenger compartment is kept low and fogging of the window glass is suppressed.

JP 2003-83427 A

  By the way, in the situation where heating is performed by the heating device, the temperature in the passenger compartment is usually higher than the temperature outside the passenger compartment. Therefore, when air is guided to the heater core through the outside air passage in order to suppress the fogging of the window glass during heating, the temperature of the air used for heat exchange in the heater core and the heater core are compared with the case where the air is guided through the inside air passage. The difference from the temperature of the cooling water passing through the interior increases, and the amount of heat consumed by heating (amount of heat removed from the cooling water) increases.

  Such an increase in heat consumption is not a problem when the temperature of the cooling water is sufficiently high, for example, when the internal combustion engine has been warmed up. However, when the temperature of the cooling water is low, the increase in the temperature is delayed, which is not preferable because it causes an early decrease in the friction of the internal combustion engine and thus prevents a reduction in fuel consumption.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a vehicle heating device that can ensure a heating function while suppressing fogging of a window glass and reduce fuel consumption of an in-vehicle internal combustion engine. Is to provide.

Hereinafter, means for achieving the above-described object and its operation and effects will be described.
According to the first aspect of the present invention, there is provided a heater core through which cooling water of an internal combustion engine mounted on a vehicle passes, an internal air passage for guiding air inside the passenger compartment to the heater core, and air outside the passenger compartment. An outside air passage that guides the heater core, and heats the air guided through at least one of the inside air passage and the outside air passage through heat exchange with cooling water that passes through the inside of the heater core, and then the interior of the vehicle interior. In the vehicle heating apparatus that supplies the air to the vehicle and performs heating, the ratio of the amount of air guided through the inside air passage and the amount of air guided through the outside air passage is determined based on the index value of the temperature of the internal combustion engine. The gist is to provide setting means for variably setting.

  When the temperature of the internal combustion engine is low, the temperature of the cooling water is also low, and the amount of heat available for heating is small. Therefore, at this time, the amount of air guided through the inside air passage can be increased as much as possible within a range in which the window glass is not fogged, and heating can be efficiently performed by using relatively warm air in the passenger compartment as much as possible. desirable. On the other hand, when the temperature of the internal combustion engine is high, the temperature of the cooling water is also high, and the amount of heat available for heating is large. Therefore, it is desirable to reliably prevent fogging of the window glass while ensuring sufficient heating performance by using a large amount of relatively low temperature and low humidity air guided through the outside air passage at this time. As described above, the items required when the heating apparatus performs heating differ depending on the temperature of the internal combustion engine.

  According to the above configuration, the ratio between the amount of air guided through the inside air passage and the amount of air guided through the outside air passage can be set so as to satisfy such required items. Therefore, the heating function can be secured while suppressing the fogging of the window glass according to the temperature of the internal combustion engine, and furthermore, the fuel consumption can be reduced by the early rise of the temperature of the internal combustion engine. Become.

  According to a second aspect of the present invention, in the vehicle heating apparatus according to the first aspect, the setting means determines the ratio in the same operating environment based on the index value, and the temperature state of the internal combustion engine is The gist of the invention is to set different values for the low temperature state and the high temperature state.

According to the said structure, the said ratio can be set so that the requirement item when the temperature state of an internal combustion engine is a low temperature state and the requirement item when it is a high temperature state may each be satisfy | filled.
According to a third aspect of the present invention, in the vehicle heating device according to the second aspect of the invention, the setting means has the ratio according to whether or not a wiper provided in the vehicle is operated when the low temperature state is set. It is the gist that it is set.

  When it rains, the window glass tends to fog up due to high humidity. For this reason, when the temperature of the internal combustion engine is low, if the amount of air guided through the inside air passage is increased by a certain amount without considering the presence or absence of rainfall, the following inconvenience may occur. That is, if the above ratio is set in accordance with a situation where there is no rain, the amount of inside air may increase excessively during the rain and the window glass may become cloudy. In addition, if the above ratio is set according to the situation where there is rainfall, even if the inside air rate is increased, even if the inside air rate is increased, the fogging of the window glass is suppressed, but a small amount is set as the amount of inside air. Efficiency may be reduced.

  In this regard, according to the above configuration, when the temperature of the internal combustion engine is low, the ratio can be set according to the presence or absence of rainfall determined based on the presence or absence of the operation of the wiper. Suitable coexistence with ensuring of a heating function can be aimed at.

  According to a fourth aspect of the present invention, in the vehicle heating apparatus according to the third aspect, the setting means corresponds to the low temperature state when the wiper is not in operation. The gist is that the value is set to a value suitable for the high temperature state when the wiper is operated.

  According to the above configuration, when the wiper is operating, that is, when there is a high possibility that it is raining, it is possible to reliably suppress fogging of the window glass by using a large amount of air guided through the outside air passage. In addition, when the wiper is not operating, that is, when there is a high possibility that it is not raining, the amount of air guided through the inside air passage can be increased to efficiently perform heating.

  According to a fifth aspect of the present invention, in the vehicle heating apparatus according to any one of the second to fourth aspects, the setting unit is configured to perform the operation according to the number of passengers of the vehicle when the low temperature state is set. The gist is to change the ratio.

  When the number of passengers is large, the humidity in the passenger compartment tends to be high, and the window glass tends to be fogged. For this reason, when the temperature of the internal combustion engine is low, if the amount of air guided through the inside air passage is increased by a certain amount without considering the number of passengers, the following inconvenience may occur. That is, first, if the ratio is set in accordance with the situation where the number of passengers is small, the amount of inside air may be excessively increased and the window glass may be fogged when the number of passengers is large. In addition, when the inside air rate is set according to the situation where there are many occupants, the amount of inside air is small even when the number of occupants is small, even if the inside air rate is increased, the fogging of the window glass is suppressed. The amount may be set and the heating efficiency may be lowered.

  In this regard, according to the above configuration, when the temperature of the internal combustion engine is low, the ratio can be set in accordance with the number of passengers, and both the prevention of fogging of the window glass and the securing of the heating function are achieved. be able to.

1 is a schematic view showing a schematic configuration of a vehicle to which an embodiment embodying the present invention is applied. The flowchart which shows the specific process sequence of a variable setting process. Explanatory drawing which shows the relationship between inside air rate, the number of passengers, and outside temperature.

DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment in which a vehicle heating apparatus according to the present invention is embodied will be described.
FIG. 1 shows a schematic configuration of a vehicle to which the vehicle heating apparatus according to the present embodiment is applied.
As shown in FIG. 1, the vehicle 10 is equipped with an internal combustion engine 11 as a drive source. As the internal combustion engine 11, a type in which engine oil circulates inside is adopted. A transmission 13 is connected to the output shaft 12 of the internal combustion engine 11, and the vehicle 10 travels by transmitting the rotation of the output shaft 12 of the internal combustion engine 11 to wheels (not shown) via the transmission 13. To do. The vehicle 10 is provided with a wiper 15 for removing rainwater and the like adhering to the window glass of the passenger compartment 14, and a wiper switch 16 for switching between the operation and non-operation of the wiper 15 is provided in the passenger compartment 14. Is provided.

  The vehicle 10 is provided with a heat exchange device 17 for exchanging heat with the internal combustion engine 11. The heat exchange device 17 circulates cooling water filled in a circulation path 18 provided so as to pass through the inside of the internal combustion engine 11 through driving of a water pump 19, whereby the cooling water, the internal combustion engine 11, Heat exchange between the two. Through this heat exchange, when the temperature of the internal combustion engine 11 is higher than the temperature of the cooling water, the internal combustion engine 11 is cooled. The water pump 19 is driven by transmission of rotation from the output shaft 12 of the internal combustion engine 11.

  The heat exchange device 17 not only exchanges heat between the cooling water and the internal combustion engine 11 but also exchanges heat between the cooling water and the transmission oil of the transmission 13. Specifically, the heat exchange device 17 includes a branch passage 20 that branches from the circulation path 18 and extends to join the circulation path 18, and an oil cooler 21 that is provided in the middle of the branch path 20. . The oil cooler 21 is provided in the middle of the oil passage 22 for circulating the transmission oil.

  When the cooling water and the transmission oil pass through the oil cooler 21, heat exchange is performed between the cooling water and the transmission oil in the oil cooler 21. Accordingly, when the temperature of the transmission oil is higher than the temperature of the cooling water, the oil is cooled by the cooling water. On the other hand, when the temperature of the transmission oil is lower than the temperature of the cooling water, the oil is warmed by the cooling water. The branch passage 20 is provided with a flow control valve 23 that opens and closes in order to adjust the flow rate of the cooling water passing through the oil cooler 21. Through adjustment of the opening degree of the flow control valve 23, the cooling water, transmission oil, It is possible to adjust the amount of heat exchanged between the two.

  The vehicle 10 includes an electronic control device (engine ECU) 24 for performing operation control of the internal combustion engine 11 and drive control of the flow rate control valve 23 and an electronic control device (transmission ECU) for performing operation control of the transmission 13. 25. The engine ECU 24 receives output signals from various sensors such as a water temperature sensor 26 for detecting the temperature of the cooling water (cooling water temperature THW) of the internal combustion engine 11 and a temperature sensor 27 for detecting the temperature (THOE) of engine oil. Have been entered. The transmission ECU 25 receives output signals from various sensors such as a temperature sensor 28 that detects the temperature (THOT) of the transmission oil. Further, the engine ECU 24 and the transmission ECU 25 are connected to each other and can communicate with each other.

  The vehicle 10 is provided with an air conditioner 30 for heating and cooling the passenger compartment 14. The air conditioner 30 includes a blower 31 for blowing air into the passenger compartment 14. Air blown by the blower 31 introduces air from the outside to the inside of the air duct 32, and the air passes through the evaporator 33 and the heater core 34 and is then sent out into the vehicle compartment 14. The evaporator 33 is configured such that a refrigerant for air conditioning circulates through a refrigerant passage 35 formed therein, and cools the air in the air duct 32 through heat exchange with the refrigerant. The refrigerant circulates in the refrigerant passage 35 through the operation of the air conditioning compressor 36 connected to the output shaft 12 of the internal combustion engine 11 and is cooled in the circulation process. The heater core 34 passes through the circulation path 18 of the heat exchange device 17 described above, and the air in the air duct 32 is exchanged through heat exchange with warm cooling water passing through the circulation path 18. It is for warming up.

  An air mix damper 37 is provided between the evaporator 33 and the heater core 34 inside the air duct 32. The air mix damper 37 is for adjusting the temperature of the air passing through the air duct 32, and the air passing through the heater core 34 among the air passing through the air duct 32 through the change of the opening / closing position thereof. Adjust the ratio.

  For example, by moving the open / close position of the air mix damper 37 to a position (minimum opening) where the amount of air passing through the heater core 34 is minimized, the heat in the heater core 34 is hardly exchanged at this time. Air is supplied into the passenger compartment 14, and the temperature of the air sent into the passenger compartment 14 is lowest. Then, by changing the open / close position of the air mix damper 37 to a position where the amount of air passing through the heater core 34 is larger than the minimum opening, the heat exchange amount in the heater core 34 is increased, and the air duct 32 is moved from the passenger compartment. The temperature of the air sent into 14 becomes high. In this manner, the amount of heat exchanged between the cooling water and the air in the heater core 34 is adjusted through the position control of the air mix damper 37, and the temperature of the air sent from the air duct 32 into the vehicle compartment 14 is adjusted. Is done.

  In the air conditioner 30, as a passage for guiding air into the air duct 32, an inside air passage 38 that guides air inside the passenger compartment 14 (hereinafter referred to as “inside air”) and an air outside the passenger compartment 14 (hereafter referred to as “inside air”). , “Outside air”) is provided. In addition, an inside / outside air adjusting door 40 is provided at a joining portion of the inside air passage 38 and the outside air passage 39. The inside / outside air adjusting door 40 is a ratio of the amount of air introduced through the inside air passage 38 and the amount of air introduced through the outside air passage 39 of the air introduced into the portions where the evaporator 33 and the heater core 34 are disposed through the air duct 32 (hereinafter, “ The air introduction ratio ") is to be changed.

  For example, by setting the operation position of the inside / outside air adjusting door 40 to a position where the outside air passage 39 is opened and the inside air passage 38 is closed (inside air passage closed position), air is introduced into the air duct 32 only through the outside air passage 39. State (outside air introduction state). On the other hand, by setting the operation position of the inside / outside air adjusting door 40 to a position where the inside air passage 38 is opened and the outside air passage 39 is closed (outside air passage closed position), air is introduced into the air duct 32 only through the inside air passage 38. (Internal air circulation state). On the other hand, by adjusting the operation position of the inside / outside air adjusting door 40 to a position between the inside air passage closed position and the outside air passage closed position, the passage cross-sectional areas of the inside air passage 38 and the outside air passage 39 are respectively adjusted, and the air introduction is performed. The ratio is adjusted to an arbitrary ratio.

  The blower 31, the air mix damper 37, and the inside / outside air adjustment door 40 in the air conditioner 30 are operation-controlled through an electronic control device (air conditioner ECU) 41 for the air conditioner mounted on the vehicle 10. The air conditioner ECU 41 and the engine ECU 24 are connected to each other and can communicate with each other.

  The air conditioner ECU 41 is input with various sensors for detecting the driving environment of the vehicle 10 and output signals of various switches operated by passengers of the vehicle 10. As various sensors, for example, a solar radiation amount sensor 42 for detecting the amount of solar radiation in the passenger compartment 14, an outside air temperature sensor 43 for detecting the outside air temperature (outside air temperature THAO), the inside air temperature (inside air temperature THAI). An internal air temperature sensor 44 and the like are provided. Each seat of the vehicle 10 is provided with an occupant sensor 45 for detecting the seating of the occupant. The various switches include, for example, a mode changeover switch 46 for switching between an auto mode for automatically adjusting the temperature in the passenger compartment 14 and a manual mode for manual adjustment, and a target value (set temperature) for the temperature in the passenger compartment 14. ) Is set. A temperature setting switch 47 is provided. Also, an air volume setting switch 48 for setting the air volume of the blower 31, an inside / outside air switching switch 49 for switching between an outside air introduction state and an inside air circulation state, an air conditioner switch 50 for switching between operation and non-operation of the compressor 36, and the like. Is provided. Further, an output signal of the wiper switch 16 and the like are also input to the air conditioner ECU 41.

  The air conditioner ECU 41 controls the operation of various devices of the air conditioner 30 according to the operation state of the various switches operated by the passenger when the manual mode is selected by the operation of the mode changeover switch 46 by the passenger of the vehicle 10. . Specifically, the open / close position of the air mix damper 37 is adjusted so that the temperature of the air sent from the air duct 32 into the passenger compartment 14 becomes a value corresponding to the operating state of the temperature setting switch 47, and the blower 31 The rotational speed of the blower 31 is adjusted so that the air volume becomes the set air volume indicated by the operation state of the air volume setting switch 48. Further, the operation state of the inside / outside air adjustment door 40 is adjusted so that the position corresponds to the operation state of the inside / outside air changeover switch 49, and the operation and non-operation of the compressor 36 are switched according to the operation state of the air conditioner switch 50. It is done.

  On the other hand, when the “auto mode” is selected by the operation of the mode change switch 46 by the occupant's operation, the air conditioner ECU 41 does not depend on the operation state of the air volume setting switch 48, the inside / outside air change switch 49, and the air conditioner switch 50. The operation of various devices of the device 30 is controlled. Specifically, first, the target blowing temperature TAO is calculated according to the set temperature set by operating the temperature setting switch 47, the inside air temperature THAI, the solar radiation amount, the outside air temperature THAO, the cooling water temperature THW, and the like. This target blowing temperature TAO is a target value for the temperature of the air blown into the vehicle compartment 14 from the air duct 32, and is a temperature at which the temperature in the vehicle compartment 14 can be maintained at the set temperature. Then, the open / close position of the air mix damper 37 is adjusted so that the temperature of the air sent from the air duct 32 into the passenger compartment 14 becomes the target blowout temperature TAO, and the air volume of the blower 31 becomes an optimal value. The operation of the blower 31 is controlled according to the blowing temperature TAO. At this time, the operation position of the inside / outside air adjustment door 40 is controlled based on the outside air temperature THAO and the like, the air introduction ratio is adjusted, and the operation of the compressor 36 is controlled.

  By the way, in the situation where heating is performed by the air conditioner 30, the temperature inside the passenger compartment 14 is usually higher than the temperature outside the passenger compartment 14. Therefore, when the outside air is introduced in order to suppress the fogging of the window glass of the passenger compartment 14 during heating, the air used for heat exchange in the heater core 34 and the inside of the heater core 34 are compared with the case where the inside air is circulated. The temperature difference from the cooling water passing through increases and the amount of heat consumed by heating (the amount of heat removed from the cooling water) increases. Such an increase in the amount of consumed heat is not a problem when the temperature of the cooling water is sufficiently high, for example, when the internal combustion engine 11 has been warmed up. However, when the temperature of the cooling water is low, the increase in the temperature is delayed. This is one factor that hinders the early reduction of the friction of the internal combustion engine 11 and the transmission 13 and hence the reduction of the fuel consumption of the internal combustion engine 11. Become.

Here, the items required for the operation control of the inside / outside air adjustment door 40 when performing the heating differ depending on the temperature of the internal combustion engine 11.
First, when the temperature of the internal combustion engine 11 is high, the temperature of the cooling water is also high, and the amount of heat available for heating is large. Therefore, even if a large amount of low-temperature outside air is used at this time, necessary heating performance can be ensured by performing heating using a sufficient amount of heat of the cooling water. Therefore, at this time, it is desirable to use a large amount of low-humidity outside air for heating, so that the humidity in the passenger compartment 14 is kept low and fogging of the window glass in the passenger compartment 14 is reliably prevented.

  On the other hand, when the temperature of the internal combustion engine 11 is low, the temperature of the cooling water is also low, and the amount of heat available for heating is small. Therefore, if a large amount of low-temperature air is used for heating at this time, the amount of heat consumed by heating increases as described above, compared with the case where only the relatively high-temperature inside air is used. This will cause a delay in the temperature rise rate. However, if the amount of the inside air is simply increased in order to raise the temperature of the cooling water at an early stage, the inside air is relatively high in humidity, so that the humidity of the passenger compartment 14 is likely to be high, and the window glass is likely to be fogged. End up. Accordingly, at this time, the amount of the inside air is increased as much as possible within a range in which the window glass of the passenger compartment 14 is not fogged, and the relatively warm air in the passenger compartment 14 is utilized as much as possible to efficiently perform heating. desirable.

  In the present embodiment based on such a situation, the ratio of the amount of inside air used for heating and the amount of outside air (the air introduction ratio) is variably set based on the temperature of the internal combustion engine 11. Such variable setting of the air introduction ratio is executed only when the auto mode is selected, that is, when the operation of the inside / outside air adjustment door 40 is controlled without depending on the operation position of the inside / outside air changeover switch 49. . Further, as the temperature of the internal combustion engine 11, the coolant temperature THW, the engine oil temperature THOE, and the transmission oil temperature THOT which are index values thereof are used.

The details of the process for variably setting the air introduction ratio (variable setting process) will be described below. In the present embodiment, this variable setting process functions as setting means.
FIG. 2 is a flowchart showing a specific processing procedure of the variable setting process. The series of processes shown in this flowchart is executed by the air conditioner ECU 41 as an interrupt process at predetermined intervals on the condition that the auto mode is selected. Process.

As shown in FIG. 2, in this process, it is first determined whether or not all of the following [Condition A] to [Condition C] are satisfied (Steps S101 to S103).
[Condition A] Transmission oil temperature THOT is higher than a predetermined temperature T1 (for example, 65 degrees).
[Condition B] The engine oil temperature THOE is higher than a predetermined temperature T2 (for example, 65 degrees).
[Condition C] The coolant temperature THW is higher than a predetermined temperature T3 (for example, 65 degrees).

  If all [Condition A] to [Condition C] are satisfied (Steps S101 to S103 are all “YES”), the internal combustion engine 11 and the transmission 13 are in a high temperature state. Assuming that the friction of the internal combustion engine 11 and the transmission 13 is moderately low, the air introduction ratio is set to a ratio commensurate with such a high temperature state.

  Specifically, a control target value (target operation position) for the operation position of the inside / outside air adjustment door 40 is calculated based on the outside air temperature THAO, the inside air temperature THAI, the set temperature, the cooling water temperature THW, and the like (step S104). The operation of the inside / outside air adjustment door 40 is controlled so that the target operation position matches the actual operation position (step S105).

  Here, the air introduction ratio is set based on the following idea. When the temperature state of the internal combustion engine 11 or the transmission 13 is in a high temperature state, the cooling water temperature THW is high, so that the amount of heat available for heating out of the heat of the cooling water is sufficiently large, and the transmission oil temperature THOT. Therefore, the cooling water temperature THW is not unnecessarily lowered by heat exchange in the oil cooler 21. Therefore, even if the ratio of the outside air in the air guided to the air duct 32 at this time (hereinafter referred to as “outside air ratio”) is increased, an excessive delay of the rising speed of the cooling water temperature THW resulting from this, and consequently the heating function The possibility of causing a decrease in fuel consumption and an increase in fuel consumption of the internal combustion engine 11 is extremely low. In view of this point, basically, the above-described outside air is basically emphasized to surely suppress the fogging of the window glass of the passenger compartment 14 rather than performing the heating by efficiently using the heat of the cooling water. The operation position of the inside / outside air adjustment door 40 is adjusted so that the rate is sufficiently large.

  On the other hand, if any one of [Condition A] to [Condition C] is not satisfied (any of Steps S101 to S103 is “NO”), it is determined whether or not the wiper 15 is not operating. (Step S106). Here, whether or not the wiper 15 is activated is determined based on the operation position of the wiper switch 16.

  When the wiper 15 is operating (step S106: NO), the operation position of the inside / outside air adjustment door 40 is adjusted in the same adjustment manner as when the internal combustion engine 11 and the transmission 13 are in a high temperature state. (Steps S104 and S105). That is, at this time, although the internal combustion engine 11 and the transmission 13 are in a low temperature state that is not a high temperature state, the humidity is likely to be high due to rain. It is determined that there is a possibility that the air introduction ratio is set to a ratio commensurate with the high temperature state in order to reliably suppress fogging of the window glass.

  On the other hand, if any one of [Condition A] to [Condition C] is not satisfied (any of Steps S101 to S103 is “NO”), and the wiper 15 is not operating (Step S106: YES), it is determined that the internal combustion engine 11 and the transmission 13 are in a low temperature state and it is not raining, and the air introduction ratio is set to a value commensurate with the low temperature state.

  Specifically, first, the target operation position is calculated from the map based on the number of passengers on the vehicle 10 and the outside air temperature THAO (step S107), and the target operation position and the actual operation position coincide with each other. Thus, the operation of the inside / outside air adjustment door 40 is controlled (step S105).

  FIG. 3 shows the ratio of the inside air to the air guided into the air duct 32 (hereinafter, “inside air rate”) and the number of passengers when it is assumed that the actual operation position and the target operation position coincide with each other at this time. And the relationship between the outside temperature THAO.

  As shown in FIG. 3, the ratio of the internal air rate at this time is set to a different ratio for each of a plurality (six in this embodiment) of regions determined by the outside air temperature THAO and the number of passengers. Specifically, the inside air rate is “0%” in the region where the outside air temperature THAO is lower than the line L1, “20%” in the region between the line L1 and the line L2, and between the line L2 and the line L3. "40%" in the region of "60", "60%" in the region between the lines L3 and L4, "80%" in the region between the lines L4 and L5, the higher outside temperature THAO than the line L5 In the area, “0%” is set. Further, a higher ratio is set as the inside air rate as the number of passengers is smaller and as the outside air temperature THAO is higher.

  Here, the fogging of the window glass occurs when water drops adhere to the window glass when the temperature of the window glass becomes equal to or lower than the dew point temperature of the temperature in the passenger compartment 14. When the outside air temperature THAO is high, the temperature of the window glass is high and the window glass is not easily fogged, so that the inside air rate can be increased.

  In this regard, in the present embodiment, the target operation position of the inside / outside air adjustment door 40 is set so that the inside air rate increases as the outside air temperature THAO increases. Therefore, the inside air rate can be set in accordance with the relationship between the outside temperature THAO and the likelihood of fogging of the window glass, and the inside air rate is increased as much as possible within a range in which the window glass does not fog. Will be able to.

  Further, when the number of passengers is large, the humidity in the passenger compartment 14 is likely to be high due to sweating of the passengers, and the window glass is likely to be fogged. Therefore, the inside air rate is increased by a certain value without considering the number of passengers. Then, the following inconvenience may occur. That is, first, if the inside air rate is set in accordance with the situation where the number of passengers is small, the amount of the inside air becomes excessively large and the window glass becomes clouded when the number of passengers is large. In addition, when the inside air rate is set according to the situation where there are many occupants, the amount of inside air is small even when the number of occupants is small, even if the inside air rate is increased, the fogging of the window glass is suppressed. The amount is set and the heating efficiency is lowered.

  In the present embodiment, the target operation position of the inside / outside air adjustment door 40 is set so that the inside air rate increases as the number of passengers decreases. Therefore, the inside air rate can be set according to the relationship between the number of passengers and the likelihood of fogging of the window glass, and the inside air rate is increased as much as possible within a range in which the window glass does not fog. Will be able to.

  Further, since the humidity is high during the rain, the window glass of the passenger compartment 14 is likely to be fogged. For this reason, when the temperature of the internal combustion engine 11 is low and the amount of air guided through the inside air passage 38 is increased by a certain amount without considering the presence or absence of rainfall, the following inconvenience may occur. That is, first, when the inside air rate is set in accordance with a situation where there is no rain, the amount of inside air becomes excessive during the rain and the window glass becomes cloudy. Also, if the inside air rate is set according to the situation where there is rainfall, even if the inside air rate is increased, even if the inside air rate is increased, fogging of the window glass is suppressed, but a small amount is set as the amount of inside air. Efficiency will be low.

  In the present embodiment, when the temperature state of the internal combustion engine 11 and the transmission 13 is a low temperature state, the inside air rate is set according to the presence or absence of rainfall. That is, when there is a high possibility that it is not raining (step S106 of FIG. 2: YES), the inside air rate is increased as much as possible within a range in which fogging does not occur on the window glass, but it is highly likely that it is raining. Sometimes (step S106: NO), the inside air rate is reduced. Thus, when there is no rain, the amount of inside air can be increased and heating can be performed efficiently within a range where fogging of the window glass can be accurately suppressed. Can be reliably suppressed. Therefore, it is possible to suitably achieve both prevention of fogging of the window glass and ensuring of the heating function.

  By executing the variable setting process in this way, as described above, the air introduction ratio is set so that the temperature of the internal combustion engine 11 is high and the same temperature so as to satisfy each required item depending on the temperature of the internal combustion engine 11. Can be set separately for low times. Thereby, the air introduction ratio in the same operating environment can be set to different values when the temperature state of the internal combustion engine 11 and the transmission 13 is a low temperature state and when it is a high temperature state. Therefore, when the temperature of the internal combustion engine 11 is high, a large amount of outside air having a low humidity can be used to maintain the humidity of the passenger compartment 14 low and to reliably suppress fogging of the window glass of the passenger compartment 14. In addition, when the temperature of the internal combustion engine 11 is low, the amount of inside air is increased as much as possible within a range in which the window glass of the passenger compartment 14 is not fogged, so that the relatively warm air in the passenger compartment 14 is utilized as much as possible. Heating can be performed well. Accordingly, the heating function can be ensured while suppressing the fogging of the window glass of the passenger compartment 14 according to the temperature of the internal combustion engine 11, and further, the internal combustion engine 11 and the transmission 13 are caused by an early rise in temperature. The fuel consumption of the engine 11 can also be reduced.

As described above, according to the present embodiment, the effects described below can be obtained.
(1) A heating function can be ensured while suppressing fogging of the window glass of the passenger compartment 14 according to the temperature of the internal combustion engine 11, and further, fuel consumption can be reduced due to an early rise in the temperature of the internal combustion engine 11. You can also.

  (2) The air introduction ratio in the same operating environment can be set to a different value depending on whether the temperature state of the internal combustion engine 11 or the transmission 13 is a low temperature state or a high temperature state. Therefore, the air introduction ratio can be set so as to satisfy the required items when the temperature state is a low temperature state and the required items when the temperature state is a high temperature state.

  (3) When the temperature state of the internal combustion engine 11 or the transmission 13 is a low temperature state, the air introduction ratio is set according to whether or not the wiper 15 is activated. Therefore, the air introduction ratio can be set according to the presence or absence of rainfall determined based on the presence or absence of the operation of the wiper 15, and suitable coexistence between prevention of fogging of the window glass and ensuring of the heating function can be achieved. .

  (4) The air introduction ratio when the temperature state of the internal combustion engine 11 or the transmission 13 is in a low temperature state is set to a value commensurate with the low temperature state when the wiper 15 is not operating, and when the wiper 15 is operating. Was set to a value commensurate with the high temperature state. Therefore, when there is no rain, it is possible to efficiently perform heating by increasing the amount of inside air while accurately suppressing the fogging of the window glass. Can be suppressed.

  (5) Since the air introduction ratio is set according to the number of passengers when the temperature state of the internal combustion engine 11 and the transmission 13 is a low temperature state, the inside air rate can be set within a range in which the window glass is not fogged. It can be as large as possible. Therefore, suitable coexistence with prevention of fogging of a window glass and ensuring of a heating function can be aimed at.

The embodiment described above may be modified as follows.
The calculation mode of the target operation position when the temperature state of the internal combustion engine 11 or the transmission 13 is a low temperature state and the wiper 15 is not operating is calculated so as to satisfy the relationship shown in FIG. It is not limited and can be changed arbitrarily. In short, it is only necessary to calculate a value that increases the inside air rate as the target operation position when the number of passengers is small and when the outside air temperature THAO is high.

  The air introduction ratio when the temperature state of the internal combustion engine 11 or the transmission 13 is a low temperature state and when the wiper 15 is operating is different from a value that is appropriate when the temperature state is a high temperature state. However, it may be set to a value that is appropriate when the temperature state is a low temperature state and when it is raining. According to such a configuration, it is possible to increase the inside air rate within a range in which the window glass is not fogged even during rainfall.

The process (step S106 in FIG. 2) for variably setting the air introduction ratio according to whether or not the wiper 15 is activated may be omitted.
-The structure for variably setting the air introduction ratio according to the number of passengers may be omitted. Such a configuration can be realized, for example, by adopting a configuration in which the target operation position is calculated based only on the outside temperature THAO in the process of step S104 in FIG.

  Any one or two of the processes in steps S101 to S103 in FIG. 2 may be omitted. In addition, a temperature sensor for detecting the temperature of the internal combustion engine 11 and the transmission 13 is newly provided, and whether or not the temperature detected by the temperature sensor is higher than a predetermined temperature in place of the processing of steps S101 to S103. A process for determining the above may be executed. In short, it is only necessary to determine whether or not the index value of the temperature of the internal combustion engine 11 is higher than a predetermined temperature. Also with such a configuration, it can be determined whether or not the temperature state of the internal combustion engine 11 is a high temperature state, and the air introduction ratio can be variably set according to the determination result.

  -It is not limited to switching the setting mode of the air introduction ratio between when the temperature state of the internal combustion engine 11 and the transmission 13 is a high temperature state and when the temperature state is a low temperature state, for example, depending on the temperature state of the internal combustion engine 11 or the transmission 13 You may make it switch the setting aspect of an air introduction ratio in three or more area | regions divided.

  The internal combustion engine 11 is one of the calculation parameters stored in the target operation position calculation map instead of switching the setting mode of the air introduction ratio in a plurality of regions according to the temperature state of the internal combustion engine 11 and the transmission 13. The temperature index value may be adopted. Even with such a configuration, the air introduction ratio can be variably set in accordance with the index value of the temperature of the internal combustion engine 11.

  DESCRIPTION OF SYMBOLS 10 ... Vehicle, 11 ... Internal combustion engine, 12 ... Output shaft, 13 ... Transmission, 14 ... Vehicle compartment, 15 ... Wiper, 16 ... Wiper switch, 17 ... Heat exchange device, 18 ... Circulation path, 19 ... Water pump, 20 DESCRIPTION OF SYMBOLS ... Branch passage, 21 ... Oil cooler, 22 ... Oil passage, 23 ... Flow control valve, 24 ... Engine ECU, 25 ... Transmission ECU, 26 ... Water temperature sensor, 27 ... Temperature sensor, 28 ... Temperature sensor, 30 ... Air conditioner, 31 ... Blower, 32 ... Air duct, 33 ... Evaporator, 34 ... Heater core, 35 ... Refrigerant passage, 36 ... Compressor, 37 ... Air mix damper, 38 ... Inside air passage, 39 ... Outside air passage, 40 ... Inside / outside air regulating door, 41 ... Air conditioner ECU, 42: solar radiation sensor, 43 ... outside air temperature sensor, 44 ... inside air temperature sensor, 45 ... occupant sensor, 46 ... mode switching Pitch, 47 ... temperature setting switch, 48 ... air volume setting switch, 49 ... inside and outside air switching switch, 50 ... air conditioning switch.

Claims (5)

A heater core through which cooling water of an internal combustion engine mounted in a vehicle passes, an internal air passage for guiding the air inside the passenger compartment to the heater core, and an outdoor air passage for guiding air outside the passenger compartment to the heater core are provided. And for heating the vehicle by heating the air guided through at least one of the inside air passage and the outside air passage through heat exchange with the cooling water passing through the inside of the heater core and then supplying the air to the inside of the passenger compartment. In the heating system,
A vehicle comprising: setting means for variably setting a ratio between the amount of air guided through the inside air passage and the amount of air guided through the outside air passage based on an index value of the temperature of the internal combustion engine. Heating system. The vehicle heating device according to claim 1,
The setting means sets the ratio in the same operating environment to different values depending on whether the temperature state of the internal combustion engine determined based on the index value is a low temperature state or a high temperature state. A vehicle heating device. The heating device for vehicles according to claim 2,
The vehicle heating device according to claim 1, wherein the setting means sets the ratio according to whether or not a wiper provided in the vehicle is operated when the vehicle is in the low temperature state. In the vehicle heating device according to claim 3,
The setting means sets the ratio at the low temperature state to a value commensurate with the low temperature state when the wiper is not operated, and to a value commensurate with the high temperature state when the wiper is operated. What is claimed is: 1. A vehicle heating device, In the heating apparatus for vehicles as described in any one of Claims 2-4,
The said setting means changes the said ratio according to the passenger | crew number of the said vehicle when it is the said low temperature state. The vehicle heating apparatus characterized by the above-mentioned.

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