JP2004130992A - Cooling/heating structure for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically and accurately stop heating of a heat exchanger when a temperature of air fed into the cabin is sufficiently raised in the case where the heating of the heat exchanger is operated in addition to the heater at heating to raise the temperature of the air fed into the cabin in a cooling/heating structure for a vehicle. <P>SOLUTION: The cooling/heating structure for the vehicle is provided: with a heater 7 for heating air fed into the cabin using cooling water of an engine 1; and the heat exchanger 15 for heating and heat-absorbing the air fed into the cabin. The heating of the heat exchanger 15 is automatically stopped by a water temperature sensor 43 for detecting the temperature of the cooling water of the engine 1 and an air temperature sensor 44 for detecting the temperature of the air from the heat exchanger 15. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a cooling and heating structure in vehicles such as passenger cars, commercial vehicles, buses and trucks.
[0002]
[Prior art]
As disclosed in Patent Document 1, as a vehicle cooling and heating structure, a heater capable of heating air supplied to the vehicle using cooling water of an engine, and capable of heating and absorbing heat supplied to the vehicle. There is a configuration including a heat exchanger, a heater, and a temperature changing unit that changes a temperature of air supplied from the heat exchanger into the vehicle.
[0003]
In the above-described vehicle cooling and heating structure, for example, during heating in a state where the temperature inside the vehicle is low, such as in the morning of winter, the temperature inside the vehicle is rapidly increased by activating the heating of the heat exchanger in addition to the heater. Some are configured to rise.
In this case, when the temperature of the air supplied to the vehicle rises sufficiently, the heating of the heat exchanger is stopped, and the air supplied to the vehicle is heated by the heater. I try not to do it as needed. A water temperature sensor that detects the temperature of the cooling water of the engine is provided, and the heating of the heat exchanger is automatically stopped as described above based on the temperature of the cooling water of the engine detected by the water temperature sensor. are doing.
[Patent Document 1]
Japanese Utility Model Publication No. 6-65024 (FIG. 1)
[0004]
[Problems to be solved by the invention]
According to the structure described in the related art, the heating of the heat exchanger is automatically stopped based only on the temperature of the cooling water of the engine detected by the water temperature sensor. In addition to the above, if the temperature of the air supplied to the vehicle is raised by activating the heat of the heat exchanger and the temperature of the air supplied to the vehicle is not sufficiently increased, the heating of the heat exchanger is automatically performed. It is conceivable that a situation may occur in which the heating of the heat exchanger is performed without stopping even though the temperature of the air supplied into the vehicle is sufficiently increased or the temperature of the air supplied into the vehicle is sufficiently increased.
[0005]
The present invention relates to a cooling and heating structure for a vehicle, in a case where the temperature of the air supplied to the vehicle is sufficiently increased by activating the heating of the heat exchanger in addition to the heater during heating to increase the temperature of the air supplied to the vehicle. It is another object of the present invention to provide a configuration in which heating of a heat exchanger is automatically and accurately stopped.
[0006]
[Means for Solving the Problems]
[I]
According to the features of claim 1, a heater capable of heating the air supplied into the vehicle using the cooling water of the engine, and a heat exchanger capable of heating and absorbing the air supplied to the vehicle, the heater and the heat If a temperature changing means for changing the temperature of the air supplied into the vehicle from the exchanger is provided,
Equipped with a water temperature sensor that detects the temperature of the engine cooling water, an air temperature sensor that detects the temperature of the air from the heat exchanger, the temperature of the engine cooling water detected by the water temperature sensor, and the temperature detected by the air temperature sensor Stopping means is provided for automatically stopping heating of the heat exchanger based on the temperature of the air from the heat exchanger.
[0007]
Thereby, according to the feature of claim 1, when the heating of the heat exchanger is activated in addition to the heater at the time of heating to increase the temperature of the air supplied to the vehicle, the cooling water of the engine detected by the water temperature sensor is increased. In addition to the temperature, taking into account the temperature of the air from the heat exchanger detected by the air temperature sensor, the system is configured to automatically stop the heating of the heat exchanger. Compared to a configuration in which heating of the heat exchanger is automatically stopped based only on the temperature of the cooling water of the engine, the heating of the heat exchanger is It will be possible to stop automatically and accurately.
[0008]
[II]
When a heat exchanger capable of heating and absorbing the air supplied into the vehicle is provided, an air temperature sensor for detecting the temperature of the air from the heat exchanger is often provided in advance. With this configuration, when the heat exchanger absorbs heat during cooling, the air temperature sensor detects the temperature of the air from the heat exchanger. By temporarily suspending the heat absorption, frost is prevented from adhering to the heat exchanger.
[0009]
In the above-mentioned state, according to the feature of claim 1, the air temperature sensor, which may be an existing member, is also used to automatically stop the heating of the heat exchanger as described in [I] above. Since it is used, the air temperature sensor is used for automatically stopping the heating of the heat exchanger as described in the preceding section [I], and for preventing frost from adhering to the heat exchanger. It can be used for both.
[0010]
[III]
According to the feature of the second aspect, similar to the case of the first aspect, the "action" described in the above [I] and [II] is provided, and in addition, the following "action" is provided.
According to the characteristic of claim 2, the temperature of the air supplied to the vehicle based on the temperature of the cooling water of the engine detected by the water temperature sensor and the temperature of the air from the heat exchanger detected by the air temperature sensor. Is estimated, and when the estimated temperature of the air supplied into the vehicle is higher than the set temperature, the heating of the heat exchanger is automatically stopped.
[0011]
As described above, according to the second aspect of the present invention, the coolant is supplied into the vehicle based on the temperature of the engine cooling water detected by the water temperature sensor and the temperature of the air from the heat exchanger detected by the air temperature sensor. A relatively simple process of estimating the temperature of the air and comparing the estimated temperature of the air supplied into the vehicle with the set temperature is performed, and the memory capacity and the like used in the above-described process are relatively small. It has become something.
[0012]
[IV]
According to the feature of Claim 3 (Claim 4), similar to the case of Claim 2, the "action" described in the preceding items [I], [II] and [III] is provided. Has "action".
The heater that can heat the air supplied into the vehicle using the cooling water of the engine is configured so that the cooling water of the engine is supplied from the pump driven by the engine. As a result, the number of rotations of the pump also decreases, and the amount of engine cooling water supplied to the heater also decreases. Thus, even if the temperature of the engine cooling water detected by the water temperature sensor is high, if the amount of the engine cooling water supplied to the heater decreases, the heating performance of the heater may decrease.
[0013]
According to a feature of claim 3 (claim 4), the engine is provided with a rotation speed sensor for detecting the rotation speed of the engine, and when the rotation speed of the engine detected by the rotation speed sensor decreases, the engine speed is supplied to the estimated vehicle interior. The configuration is such that the temperature of the air is corrected to the lower temperature side (the set temperature is corrected to the higher temperature side).
Thus, according to the feature of claim 3 (claim 4), when the temperature of the air supplied into the vehicle is raised by activating the heating of the heat exchanger in addition to the heater during heating, the rotation speed sensor detects the temperature. When the engine speed is reduced, the estimated temperature of the air supplied into the vehicle is corrected to a lower temperature (the set temperature is corrected to a higher temperature), and the timing of stopping the heating of the heat exchanger is delayed. That is, the state in which the temperature of the air supplied into the vehicle is increased by activating the heat exchanger in addition to the heater is performed for a long time.
[0014]
Therefore, according to the feature of claim 3 (claim 4), when the amount of the engine cooling water supplied to the heater is reduced, the timing of stopping the heating of the heat exchanger is delayed (addition to the heater). The state in which the heating of the heat exchanger is activated to increase the temperature of the air supplied into the vehicle is performed for a long time, thereby compensating for the state in which the heating performance of the heater is reduced.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
[1]
FIG. 1 shows an outline of a cooling and heating structure in a passenger car, which is provided with an engine 1, a radiator 2, a cooling fan 3, and a pump 4. The engine 1, the radiator 2, and the pump 4 are connected via flow paths 5, 6. It is connected. Thereby, by the action of the pump 4, the cooling water (high temperature) of the engine 1 is supplied from the engine 1 to the radiator 2 through the flow path 5, and the cooling water (low temperature) of the engine 1 passes through the flow path 6 from the radiator 2, It is supplied from the pump 4 to the engine 1.
[0016]
As shown in FIG. 1, a heater 7 is provided, the engine 1 and the heater 7 are connected by a flow path 8, and the flow path 6 and the heater 7 are connected by a flow path 9. Thereby, by the action of the pump 4, the cooling water (high temperature) of the engine 1 is supplied to the heater 7 through the flow path 8, and the cooling water (low temperature) of the engine 1 flows through the flow path 9 and the flow path 6 from the heater 7. As a result, the fuel is supplied from the pump 4 to the engine 1.
[0017]
As shown in FIG. 1, an air-conditioning case 10 is provided, an outside air inlet 11 that supplies air outside the vehicle to the air-conditioning case 10, and air inside the vehicle to the air-conditioning case 10, in an upper portion of the air-conditioning case 10. An inside air circulation port 12 is provided. A switching plate 13 is provided at the positions of the outside air inlet 11 and the inside air circulation port 12. The outside air introduction port is opened to close the inside air circulation port 12, and the outside air introduction port 11 is closed to close the inside air circulation port 12. The switching plate 13 is operated to the inside air circulation position at which the opening is opened.
[0018]
As shown in FIG. 1, in the air-conditioning case 10, a fan 14 is provided at a lower portion of the outside air inlet 11 and the inside air circulation port 12, and a heat exchanger 15 is provided at a lower portion of the fan 14. The heater 7 is provided on the lower side of the exchanger 15. With the above structure, the air from the outside air inlet 11 or the inside air circulation port 12 is supplied from the heat exchanger 15 through the heater 7 to the interior of the vehicle by the action of the fan 14.
[0019]
As shown in FIG. 1, a compressor 16, a condenser 17, and a switching valve 18 are provided, and the heat exchanger 15, the compressor 16, the condenser 17, and the switching valve 18 are connected by flow paths 19, 20, 21, 22, and 23. It is connected.
When heating the heat exchanger 15, the switching valve 18 is operated to a heating position where the flow paths 20, 23 are connected and the flow paths 20, 21 are shut off. Thus, the heat medium compressed by the compressor 16 is supplied to the heat exchanger 15 through the flow path 20, the switching valve 18, and the flow paths 23 and 22, and the air from the fan 14 is heated by the heat exchanger 15. Therefore, the heat medium is supplied from the heat exchanger 15 to the compressor 16 through the flow path 19.
[0020]
As shown in FIG. 1, when heat is absorbed by the heat exchanger 15, the switching valve 18 is operated to a heat absorbing position where the flow paths 20 and 21 are connected and the flow paths 20 and 23 are shut off. As a result, the heat medium compressed by the compressor 16 is supplied to the condenser 17 through the flow path 20, the switching valve 18 and the flow path 21 to be cooled, and the heat medium from the condenser passes through the flow path 22 and is cooled by the heat exchanger 15. The heat from the fan 14 is absorbed by the heat exchanger 15, and the heat medium is supplied from the heat exchanger 15 to the compressor 16 through the flow path 19.
Accordingly, it is impossible to simultaneously operate the heating and the heat absorption of the heat exchanger 15, the state in which the heating of the heat exchanger 15 is operated (the state in which the heat absorption of the heat exchanger 15 is stopped), the state of the heat exchanger Three states can be set: a state in which heat absorption of the heat exchanger 15 is activated (a state in which heating of the heat exchanger 15 is stopped), and a state in which both heating and heat absorption of the heat exchanger 15 are stopped.
[0021]
As shown in FIG. 1, a damper 24 whose angle can be changed is provided on the upper side of the heater 7. Thereby, the angle of the damper 24 is changed in a state in which the heating or the heat absorption of the heat exchanger 15 is activated or in a state in which both the heating and the heat absorption of the heat exchanger 15 are stopped, so that the heat from the heat exchanger 15 is changed. By changing the amount of air supplied to the heater 7 out of the air (the first angle at which all the air from the heat exchanger 15 is supplied to the heater 7, the air from the heat exchanger 15 is completely supplied to the heater 7 It is possible to control the temperature of the air supplied into the vehicle, that is, the second angle passing through the vehicle without passing through (the intermediate angle between the first and second angles).
[0022]
[2]
As shown in FIG. 2, an upper outlet 26 is provided at an upper portion of the instrument panel 25, and a lower outlet 27 is provided near a foot of an occupant seated in a driver's seat and a passenger seat. A front outlet 28 is provided near the lower part. Air supplied into the vehicle is supplied from the air conditioning case 10 to the upper outlet 26, the lower outlet 27, and the front outlet 28 via the selection mechanism 30.
[0023]
For the selection mechanism 30, the upper supply mode in which the air supplied into the vehicle is supplied from the upper outlet 26 into the vehicle, the lower supply mode in which the air is supplied from the lower outlet 27 to the vehicle, and the supply from the front outlet 28 to the vehicle. A defroster supply mode, an upper and lower supply mode in which the upper and lower outlets 26 and 27 supply the vehicle interior, and a lower and defroster supply mode in which the lower and front outlets 27 and 28 supply the vehicle interior are set.
[0024]
As shown in FIG. 2, an auto switch 31, an off switch 32, a temperature setting switch 33, an outside air introduction switch 34, an inside air circulation switch 35, a defroster switch 36, and an outlet are provided in a center cluster (not shown) of the instrument panel 25. A setting switch 37, an air volume setting switch 38, and an air conditioner switch 39 are provided, and these are operated by an occupant, and signals from these are input to the control device 40. The control device 40 operates the motor 41 for driving the selection mechanism 30, the switching plate 13, the damper 24, the compressor 16, the switching valve 18, and the fan 14 as described in [3] to [6] described later.
[0025]
As shown in FIGS. 1 and 2, an outside air temperature sensor 42 for detecting the temperature of the air outside the vehicle, a water temperature sensor 43 for detecting the temperature of the cooling water of the engine 1, and air for detecting the temperature of the air from the heat exchanger 15. A temperature sensor 44, an in-vehicle temperature sensor 45 for detecting the temperature inside the vehicle, and a rotational speed sensor 46 for detecting the rotational speed of the engine 1 are provided, and signals from these are input to the control device 40.
[0026]
[3]
Next, the first half of the flow of control in the full auto mode in which the auto switch 31 is turned ON will be described with reference to FIGS.
When the auto switch 31 is turned on (step S1), the full auto mode is set (step S2), and the fan 14 is driven (step S3). When the defroster switch 36 is turned on (step S4), the fan 14 is driven (step S3).
[0027]
The full auto mode includes driving of the fan 14 (step S3), automatic setting of the outside air introduction mode or the inside air circulation mode (step S10), automatic setting of the temperature of the air supplied into the vehicle (step S15), as described later, Automatic setting of the rotation speed of the fan 14 (step S16), automatic setting of the angle of the damper 24 (step S17), automatic setting of one of the upper supply mode, the upper and lower supply modes, and the lower supply mode (step S18) ), A state in which heating of the heat exchanger 15 is activated (a state in which heat absorption of the heat exchanger 15 is stopped), a state in which heat absorption of the heat exchanger 15 is activated (a state in which heating of the heat exchanger 15 is stopped). ), And automatic setting (steps S28, S29, S30, S31) of three states in which both heating and heat absorption of the heat exchanger 15 are stopped. It is.
[0028]
The outside air temperature sensor 42 detects the temperature of the outside air (step S9), and based on the outside air temperature, the outside air introduction mode (the outside air introduction position where the switching plate 13 opens the outside air introduction port 11 and closes the inside air circulation port 12). Is automatically set (step S10) or the inside air circulation mode (the state where the switching plate 13 is operated to the inside air circulation position where the outside air introduction port 11 is closed and the inside air circulation port 12 is opened).
[0029]
In step S10, as shown by the solid line in FIG. 4, when the temperature of the air outside the vehicle is lower than the first temperature T1 (for example, 30 ° C.), the outside air introduction mode is automatically set, and the temperature of the air outside the vehicle is low. When the state becomes higher than the first temperature T1 from the state, the inside air circulation mode is automatically set. When the inside air circulation mode is automatically set as described above, the inside air circulation mode is maintained even when the temperature of the air outside the vehicle becomes lower than the first temperature T1, as shown by the dashed line in FIG. When the temperature of the air outside the vehicle becomes lower than the second temperature T2 (lower than the first temperature T1), the outside air introduction mode is automatically set. Thereby, it is possible to avoid a state in which the outside air introduction mote and the inside air circulation mode are frequently and repeatedly set near the first and second temperatures T1 and T2.
[0030]
The signal of the temperature setting switch 33 (the occupant operates the temperature setting switch 33 to set a desired set temperature) (step S13) and the signal of the temperature sensor 45 in the vehicle (temperature in the vehicle) (step S14) are sent to the control device 40. Is entered.
Thereby, based on the set temperature set by the temperature setting switch 33, the outside air temperature detected by the outside air temperature sensor 42, the inside temperature detected by the inside temperature sensor 45, the outside air introduction mode or the inside air circulation mode, and the like. Then, the temperature of the air supplied into the vehicle is automatically set (step S15). The rotation speed of the fan 14 is automatically set based on the temperature of the air supplied into the vehicle (step S16), and the angle of the damper 24 is automatically set (step S17). One of the upper and lower supply modes and the lower supply mode is automatically set (step S18).
[0031]
[4]
Next, the latter half of the control flow in the full auto mode in which the auto switch 31 is turned ON will be described with reference to FIG.
As shown in FIG. 3, a state in which heating of the heat exchanger 15 is activated (a state in which heat absorption of the heat exchanger 15 is stopped), a state in which heat absorption of the heat exchanger 15 is activated (heating of the heat exchanger 15). Are stopped, and a state in which both the heat and the heat absorption of the heat exchanger 15 are stopped is set under what conditions.
[0032]
As described in the preceding paragraph [1], the state in which the heating of the heat exchanger 15 is activated (the state in which the heat absorption of the heat exchanger 15 is stopped) means that the flow paths 20 and 23 shown in FIG. A state in which the switching valve 18 is operated to the heating position where the passages 20 and 21 are shut off and the compressor 16 is operated, and a state in which heat absorption of the heat exchanger 15 is operated (a state in which heating of the heat exchanger 15 is stopped) 1) is a state in which the switching valve 18 is operated to the heat absorbing position where the flow paths 20 and 21 shown in FIG. 1 are connected and the flow paths 20 and 23 are shut off, and the compressor 16 is operated. The state where both heating and heat absorption of the heat exchanger 15 are stopped is a state where the compressor 16 shown in FIG. 1 is stopped.
[0033]
As shown in FIG. 3, a set temperature (for example, 10 ° C.) and a lower set temperature (for example, 0 ° C.) lower than the set temperature are set as the temperature of the air outside the vehicle detected by the outside air temperature sensor 42. .
In the inside air circulation mode, the state where the heat absorption of the heat exchanger 15 is activated regardless of the temperature of the air outside the vehicle, the upper supply mode, the upper and lower supply modes, the lower supply mode, the lower and defroster supply modes, and the defroster supply mode ( (A state in which the heating of the heat exchanger 15 is stopped).
[0034]
As shown in FIG. 3, in the outside air introduction mode, when the temperature of the air outside the vehicle is equal to or lower than the low-side set temperature, the upper supply mode, the upper and lower supply modes, the lower supply mode, the lower and defroster supply modes, and the defroster supply mode. Regardless of this, a state in which both heating and heat absorption of the heat exchanger 15 are stopped (or a state in which heating of the heat exchanger 15 is activated (a state in which heat absorption of the heat exchanger 15 is stopped)) is set.
[0035]
As shown in FIG. 3, in the outside air introduction mode, when the temperature of the air outside the vehicle is between the low-side set temperature and the set temperature, in the upper supply mode, the upper and lower supply modes, and the defroster supply mode, the heat exchanger 15 A state in which heat absorption is activated (a state in which heating of the heat exchanger 15 is stopped) is set. In the lower supply mode, the lower and defroster supply modes, a state in which both heating and heat absorption of the heat exchanger 15 are stopped (or a state in which heating of the heat exchanger 15 is activated (heat absorption of the heat exchanger 15 is stopped). State)) is set.
[0036]
As shown in FIG. 3, in the outside air introduction mode, when the temperature of the air outside the vehicle is equal to or higher than the set temperature, regardless of the upper supply mode, the upper and lower supply modes, the lower supply mode, the lower and defroster supply modes, and the defroster supply mode. The state in which the heat absorption of the heat exchanger 15 is activated (the state in which the heating of the heat exchanger 15 is stopped) is set. The state in which the heating of the heat exchanger 15 is operated as described above (the state in which the heat absorption of the heat exchanger 15 is stopped) is the first state in which all the air from the heat exchanger 15 is supplied to the heater 7 in step S17. The angle is set when the angle of the damper 24 is set.
[0037]
Thus, when the inside air circulation mode is set (step S26), a state in which heat absorption of the heat exchanger 15 is activated (a state in which heating of the heat exchanger 15 is stopped) is set (step S28). If the outside air introduction mode is set, based on FIG. 3 (steps S26 and S27), a state in which heat absorption of the heat exchanger 15 is activated (a state in which heating of the heat exchanger 15 is stopped) (step S28). Or a state in which both heating and heat absorption of the heat exchanger 15 are stopped (steps S29 and S30), and the damper is set at the first angle at which all the air from the heat exchanger 15 is supplied to the heater 7. If the angle of 24 is set (step S29), a state in which heating of the heat exchanger 15 is activated (a state in which heat absorption of the heat exchanger 15 is stopped) is set (step S31).
[0038]
As described above, in the full auto mode in which the auto switch 31 is turned ON, the temperature of the air supplied into the vehicle is automatically controlled as described in [3] and [4]. In this case, when the defroster switch 36 is turned ON (steps S4 and S21), the defroster supply mode is set (step S22), and the process proceeds to steps S26 to S31.
[0039]
[5]
Next, a partial manual mode in the full auto mode in which the auto switch 31 is turned ON as described in [3] and [4] above will be described with reference to FIGS.
In the full auto mode, when the off switch 32 shown in FIG. 2 is operated (step S5), the fan 14 is stopped (step S32), and the process proceeds to step S30 to stop both heating and heat absorption of the heat exchanger 15. Is set. When the air conditioner switch 39 shown in FIG. 2 is turned off (step S6), the process proceeds to step S30, and a state is set in which both heating and heat absorption of the heat exchanger 15 are stopped.
[0040]
When the outside air introduction switch 34 shown in FIG. 2 is turned ON (step S7), the outside air introduction mode is set (step S11), and when the inside air circulation switch 35 is turned ON (step S8), the inside air circulation mode is set (step S8). S12). By operating the outlet setting switch 37 shown in FIG. 2 (step S19), any one of the upper supply mode, the upper and lower supply modes, the lower supply mode, the lower and the defroster supply mode can be set. Yes (step S20). By operating the air volume setting switch 38 shown in FIG. 2 (step S23), the rotation speed of the fan 14 can be set to a desired rotation speed (step S24). By turning off the air conditioner switch 39 shown in FIG. 2 (step S25), the process proceeds to step S30, and a state in which both heating and heat absorption of the heat exchanger 15 are stopped is set.
[0041]
In the case of the partial manual mode as described above, the above-mentioned operation is performed only in the portion where the partial manual mode operation is performed, and the other portions maintain the state of the full auto mode. After performing the partial manual mode operation as described above, if the auto switch 31 is turned on again, all the parts return to the full auto mode (steps S1 and S2).
[0042]
When the auto switch 31 is turned off and the defroster switch 36 is turned off, a manual mode is set. In the manual mode, the occupant operates the temperature setting switch 33 shown in FIG. 2 to arbitrarily set the angle of the damper 24, turn on the outside air introduction switch 34 or the inside air circulation switch 35, and set the outlet setting switch 37. And the operation of the air volume setting switch 38 (the fan 14 is driven when the air volume setting switch 38 is operated), and the ON / OFF operation of the air conditioner switch 39 is performed.
[0043]
In this case, when the air conditioner switch 39 is turned ON, a state in which heat absorption of the heat exchanger 15 is activated (a state in which heating of the heat exchanger 15 is stopped) is set. When the air conditioner switch 39 is turned off, a state is set in which both heating and heat absorption of the heat exchanger 15 are stopped, and the damper is set to the first angle at which all the air from the heat exchanger 15 is supplied to the heater 7. When the angle of 24 is set, a state in which heating of the heat exchanger 15 is activated (a state in which heat absorption of the heat exchanger 15 is stopped) is set.
[0044]
[6]
Next, in the fully automatic mode described in [3] and [4] and the manual mode described in [5], heating of the heat exchanger 15 is operated (the heat absorption of the heat exchanger 15 is stopped). The control flow of the automatic stop in the state) and the state in which the heat absorption of the heat exchanger 15 is activated (the state in which the heating of the heat exchanger 15 is stopped) will be described with reference to FIGS. 6 and 7.
[0045]
An air temperature sensor that detects the temperature of the air from the heat exchanger 15 in a state where the heat absorption of the heat exchanger 15 is activated (the state in which the heating of the heat exchanger 15 is stopped) (Step S28). The signal from 44 is input to the control device 40 (step S33).
[0046]
Thereby, when the temperature of the air from the heat exchanger 15 is higher than the set temperature (step S34), the state in which the heat absorption of the heat exchanger 15 is activated (the state in which the heating of the heat exchanger 15 is stopped) remains unchanged. When the temperature of the air from the heat exchanger 15 becomes lower than the set temperature (step S34), a state is set in which both the heating and the heat absorption of the heat exchanger 15 are stopped (step S35). . Therefore, frost is prevented from adhering to the heat exchanger 15 due to the temperature of the air from the heat exchanger 15 becoming too low.
[0047]
In a state in which heating of the heat exchanger 15 is activated (a state in which heat absorption of the heat exchanger 15 is stopped) (step S31), a water temperature sensor 43 that detects the temperature of the cooling water of the engine 1, Signals from an air temperature sensor 44 for detecting the temperature of the air from the exchanger 15 and a speed sensor 46 for detecting the speed of the engine 1 are input to the controller 40 (steps S36, S37, S38).
[0048]
Thus, the temperature of the air supplied into the vehicle (actual temperature TB) is estimated based on the following arithmetic expression (step S39).
TB = A1 × TE + A2 × TN + A3 × R1 + A4
TE: temperature of the cooling water of the engine 1 TN: temperature of the air from the heat exchanger 15 R1: rotation speeds A1, A2, A3, A4 of the engine 1: constants
Therefore, when the temperature of the air supplied into the vehicle (actual temperature TB) is lower than the set temperature (step S40), the state where the heating of the heat exchanger 15 is activated (the heat absorption of the heat exchanger 15 is stopped). State) is set as it is, and when the temperature of the air supplied into the vehicle (actual temperature TB) becomes higher than the set temperature (step S40), both heating and heat absorption of the heat exchanger 15 are stopped. The state is set (step S35).
[0050]
In this case, the constants A1, A2, A3, and A4 are changed in accordance with the rotation speed of the engine 1. When the rotation speed of the engine 1 decreases, the constants A1, A2, A3, and A4 change. Then, the temperature of the air supplied into the vehicle (actual temperature TB) becomes a lower value (corrected to a lower temperature side) than in a state where the rotation speed of the engine 1 is high. Therefore, even if the temperature of the cooling water of the engine 1 and the temperature of the air from the heat exchanger 15 are the same, when the rotation speed of the engine 1 decreases, the temperature of the air supplied to the vehicle (actual temperature TB) becomes lower. The value becomes low, and it is difficult to set a state in which both the heating and the heat absorption of the heat exchanger 15 are stopped (it is difficult to shift from step S40 to step S35).
[0051]
[Another embodiment of the invention]
In [6] of the above-described [Embodiment of the Invention], instead of changing the constants A1, A2, A3, and A4 in accordance with the rotation speed of the engine 1, if the rotation speed of the engine 1 becomes lower, FIG. The configuration may be such that the set temperature in step S40 is corrected to the higher temperature side. Thus, even if the temperature of the cooling water of the engine 1 and the temperature of the air from the heat exchanger 15 are the same, when the rotation speed of the engine 1 decreases, the set temperature in step S40 in FIG. Therefore, it is difficult to set a state in which both heating and heat absorption of the heat exchanger 15 are stopped (it is difficult to shift from step S40 to step S35).
In [6] of the above-mentioned [Embodiment of the invention], the arithmetic expression for estimating the temperature of the air supplied into the vehicle is a primary expression as described in [6] of the aforementioned [Embodiment of the invention] It is conceivable that not only expressions but also various arithmetic expressions such as a quadratic expression and a cubic expression are set according to the type of the vehicle.
[0052]
【The invention's effect】
According to the features of claim 1, when the temperature of the air supplied to the vehicle is raised by activating the heating of the heat exchanger in addition to the heater at the time of heating in the heating and cooling structure of the vehicle to increase the temperature of the air supplied to the vehicle. When the temperature of the heat exchanger is sufficiently raised, the heating of the heat exchanger can be automatically and accurately stopped. As a result, even though the temperature of the air supplied to the vehicle is not sufficiently raised, the heating performance of the heat exchanger is automatically stopped and the heating performance is reduced, and the temperature of the air supplied to the vehicle is reduced. Although the temperature has risen sufficiently, wasteful consumption of power caused by heating of the heat exchanger without stopping can be avoided.
[0053]
According to the feature of claim 1, the air temperature sensor, which can be said to be an existing member, is also used to automatically stop the heating of the heat exchanger, and the air temperature sensor automatically controls the heating of the heat exchanger. The present invention can be used for both the purpose of stopping temporarily and the purpose of preventing frost from adhering to the heat exchanger, which is advantageous in terms of reduction of production cost.
[0054]
According to the feature of the second aspect, the "effect of the invention" of the above-mentioned claim 1 is provided similarly to the case of the first aspect, and in addition to the "effect of the invention", the following "effect of the invention" It has.
According to the characteristic of claim 2, the temperature of the air supplied to the vehicle based on the temperature of the cooling water of the engine detected by the water temperature sensor and the temperature of the air from the heat exchanger detected by the air temperature sensor. And a relatively simple process of comparing the estimated temperature of the air supplied into the vehicle with the set temperature is performed, and the memory capacity and the like used in the above-described process may be relatively small. Therefore, it is advantageous in terms of reducing production costs.
[0055]
According to the feature of claim 3 (claim 4), the "effect of the invention" of the above-mentioned claim 2 is provided similarly to the case of the claim 2, and in addition to the "effect of the invention", "Effect of the invention" is provided.
According to the feature of claim 3 (claim 4), when heating the heat exchanger in addition to the heater at the time of heating to increase the temperature of the air supplied into the vehicle, the engine speed detected by the rotation speed sensor is determined. When the rotation speed decreases, the estimated temperature of the air supplied into the vehicle is corrected to a lower temperature (the set temperature is corrected to a higher temperature), thereby compensating for a state in which the heating performance of the heater is reduced. As a result, the heating performance was improved.
[Brief description of the drawings]
FIG. 1 is a diagram showing an outline of a cooling / heating structure. FIG. 2 is a diagram showing an outline of a link between a control device and each part. FIG. 3 is a state in which heating of a heat exchanger is activated (heat absorption of the heat exchanger is stopped. State), a state in which heat absorption of the heat exchanger is activated (a state in which heating of the heat exchanger is stopped), and a state in which both heating and heat absorption of the heat exchanger are stopped. FIG. 4 shows a state in which an outside air introduction mode and an inside air circulation mode are set based on the temperature of air outside the vehicle. FIG. 5 shows a flow of control in a full auto mode and a manual mode. FIG. 6 is a diagram showing the latter half of the flow of control in the full-auto mode and the manual mode. FIG. 7 is a diagram showing a state in which heating of the heat exchanger is activated in the full-auto mode and the manual mode (the heat exchanger). With heat absorption stopped) and Shows automatic flow control to stop the state of actuating the endotherm exchanger (state stopping the heating of the heat exchanger) DESCRIPTION OF REFERENCE NUMERALS
1 Engine 7 Heater 15 Heat exchanger 43 Water temperature sensor 44 Air temperature sensor 46 Rotation speed sensor

Claims (4)

A heater capable of heating air supplied to the vehicle using cooling water of the engine, and a heat exchanger capable of heating and absorbing heat supplied to the vehicle,
With a temperature changing means for changing the temperature of the air supplied into the vehicle from the heater and the heat exchanger,
A water temperature sensor that detects the temperature of engine cooling water, and an air temperature sensor that detects the temperature of air from the heat exchanger,
Stop means for automatically stopping heating of the heat exchanger based on the temperature of the engine coolant detected by the water temperature sensor and the temperature of air from the heat exchanger detected by the air temperature sensor. The air-conditioning structure of a vehicle equipped with: Estimating the temperature of the air supplied to the vehicle based on the temperature of the engine coolant detected by the water temperature sensor and the temperature of the air from the heat exchanger detected by the air temperature sensor. The heating and cooling structure for a vehicle according to claim 1, wherein the stopping means is configured to automatically stop heating the heat exchanger when the temperature of the air supplied into the vehicle is higher than a set temperature. . A rotation speed sensor for detecting the rotation speed of the engine is provided, and when the rotation speed of the engine detected by the rotation speed sensor decreases, the estimated temperature of the air supplied into the vehicle is corrected to a lower temperature side. 3. The cooling and heating structure for a vehicle according to claim 2, wherein said stopping means is constituted. A rotation speed sensor for detecting the rotation speed of the engine, the stop means is configured such that when the rotation speed of the engine detected by the rotation speed sensor decreases, the set temperature is corrected to a high temperature side; The vehicle cooling / heating structure according to claim 2.

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