JP2008126789A - Vehicle instrument panel cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle instrument panel cooling device capable of effectively suppressing radiant heat from a panel surface when the instrument panel is heated to high temperature due to the influence of solar radiation or high outdoor air temperature. <P>SOLUTION: This cooling device is provided with a cold blast source generating cold blast, a branch duct 4 leading the cold blast from the cold blast source to a position inside the instrument panel 1, a cold blast blow-out port 6 arranged at a position in the vicinity of the windshield 5 of the instrument panel 1 and blowing out the cold blast led from the branch duct 4 along the panel surface 1a of the instrument panel 1, and a panel cooling control means performing control for blowing out the cold blast led by the branch duct 4 from the cold blast blow-out port 6. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an instrument panel cooling device for a vehicle that cools an instrument panel that has reached a high temperature.

Conventionally, as a technique for cooling an instrument panel that has become hot, when the air conditioner blower is in operation and the internal temperature of the instrument panel is equal to or higher than a predetermined temperature, the ventilation blower is operated, the open / close damper is opened, And the vehicle ventilator which makes an intake door an inside air introduction mode is known (for example, refer to patent documents 1).
JP 2005-186860 A

  However, in the conventional vehicle ventilator, when the internal temperature of the instrument panel becomes high, the air staying inside the instrument panel is forcibly exhausted, so the temperature inside the instrument panel is However, the temperature of the panel surface exposed in the passenger compartment cannot be lowered, and in the summer when the instrument panel becomes hot, the air in the passenger compartment is radiated by radiant heat with the panel surface as a heat source. The vehicle interior is warmed, and the time required for cool-down of the passenger compartment temperature cannot be reduced as expected when riding in the summer. There was a problem of impairing sex.

  The present invention has been made paying attention to the above-mentioned problem, and when the instrument panel becomes high temperature due to the influence of solar radiation, high outside air temperature, etc., the vehicle instrument that can effectively suppress the radiant heat from the panel surface. It is an object of the present invention to provide an instrument panel cooling device.

In order to achieve the above object, in the vehicle instrument panel cooling device of the present invention,
A cold air source that produces cold air,
A cold air duct for guiding the cold air from the cold air source to an inner position of the instrument panel;
A cold air outlet that is arranged near the front window of the instrument panel and blows out the cold air guided from the cold air duct along the panel surface of the instrument panel;
When the surface temperature of the instrument panel is high, panel cooling control means for performing control to blow out the cold air led to the cold air duct from the cold air outlet,
It is provided with.

Therefore, in the instrument panel cooling device for a vehicle according to the present invention, in the panel cooling control means, when the surface temperature of the instrument panel is high, the cool air guided to the cool air duct is transferred to the front of the instrument panel. Control is performed to blow out from a cold air outlet arranged in the vicinity of the window.
For this reason, the cold air blown out from the cold air outlet flows over the panel surface of the instrument panel over a wide range due to the Coanda effect, and falls to the vicinity of the occupant's knees while taking away the radiant heat of the instrument panel. Here, the “Coanda effect” refers to a phenomenon in which when a fluid flows on the surface of an object, it flows along the surface of the object so as to stick to it.
Therefore, when the instrument panel becomes hot due to the effects of solar radiation, high outside air temperature, etc., the radiant heat with the panel surface as the heat source is effective by the direct forced cooling action of cooling the panel surface itself, which is the heat source of radiant heat. Can be suppressed.
Due to the effect of suppressing the radiant heat from the panel surface, it is possible to greatly reduce the time required to cool down the passenger compartment temperature when riding in the summer, etc. During the cooling operation such as in the above, fluctuations in the passenger compartment temperature are suppressed and stabilized, and comfort can be improved.
As a result, when the instrument panel becomes high temperature due to the influence of solar radiation or high outside air temperature, the radiant heat from the panel surface can be effectively suppressed.

  Hereinafter, the best mode for realizing an instrument panel cooling device for a vehicle according to the present invention will be described based on Example 1 shown in the drawings.

First, the configuration will be described.
FIG. 1 is an overall system diagram showing a vehicle instrument panel cooling apparatus according to a first embodiment. FIG. 2 is an exploded perspective view showing an instrument panel, a differential duct, a wind direction switching door, and a switching door actuator in the vehicle instrument panel cooling apparatus according to the first embodiment.

  As shown in FIG. 1, the vehicle instrument panel cooling device for a vehicle according to the first embodiment includes an instrument panel 1, a differential duct 2, a differential outlet 3, a branch duct 4, and a front window 5 as shown in FIG. 1. A cold air outlet 6, a wind direction switching door 7, a door shaft 8, a switching door actuator 9, a first door seal 10, a second door seal 11, a duct seal 12, a vent outlet 13, and a blower inlet. 14.

  In the first embodiment, an in-vehicle air conditioning unit A / U having a blower fan and an evaporator (cooling heat exchanger) is used as a cold air source for generating cold air.

  As shown in FIGS. 1 and 2, a differential duct 2 connected to the air conditioning unit A / U as a cold air duct that guides the cold air from the air conditioning unit A / U, which is the cold air source, to an inner position of the instrument panel 1. Among them, a branch duct 4 that branches from a midway position of the duct that faces the differential outlet 3 of the instrument panel 1 is used.

  A cold air outlet 6 disposed in the vicinity of the front window 5 (difference outlet 3) of the instrument panel 1 connects the wind direction switching door 7 provided at the branch position of the differential duct 2 to the branch duct selection side (FIG. 1). When switching to the solid line side), the cold air guided to the differential duct 2 is blown out along the panel surface 1a of the instrument panel 1.

  As shown in FIGS. 1 and 2, the wind direction switching door 7 is provided on a door shaft 8 covered with a shaft cover portion 4 a extending integrally from the branch duct 4, and a pair of left and right wind direction switching doors 7, 7. A switching door actuator 9 is provided at the center position of the door shaft 8. The wind direction switching door 7 prevents air leakage to the cold air outlet 6 by the first door seal 10 when the differential mode for blowing air from the differential outlet 3 is selected. In addition, when the instrument panel cooling mode for blowing air from the cold air outlet 6 is selected, the second door seal 11 provided at the tip prevents the air leakage to the differential outlet 3. A duct seal 12 for preventing cold air leakage is interposed between the cold air outlet portion 4b of the branch duct 4 and the cold air inlet portion 1b of the instrument panel 1. In FIGS. 1 and 2, reference numeral 2 a denotes an air outlet portion that faces the differential outlet 3.

  The instrument panel 1 includes a differential outlet 3, a cold outlet 6, a vent outlet 13, a blower inlet 14, from the upstream side of the panel near the front window 5 toward the downstream side of the panel along the flow of cold air. Are arranged in order (see FIGS. 4 and 5).

  As shown in FIG. 1, the instrument panel cooling apparatus for a vehicle according to the first embodiment includes a switching door actuator 9, a control unit 20, an internal air temperature sensor 21, a solar radiation amount sensor 22, and an instrument panel blowout as shown in FIG. 1. A temperature sensor 23, other sensors / switches 24, a blower motor 25, and a mode door actuator 26 are provided.

  When the surface temperature of the instrument panel 1 is high, the control unit 20 performs control to blow out the cold air led to the branch duct 4 from the cold air outlet 6 according to a flowchart shown in FIG.

  FIG. 3 is a flowchart showing the flow of the panel cooling control process of the instrument panel 1 executed by the control unit 20 of the first embodiment. Hereinafter, each step will be described (panel cooling control means).

  In step S1, there is a divergence between the actual vehicle interior temperature detected by the interior air temperature sensor 21 and the vehicle interior temperature set by the occupant's setting operation, and the air conditioning unit A / U is fully utilized to exhibit the cooling capacity. This is a determination step for determining whether or not it is a cool-down time in which the temperature needs to be lowered. When it is determined Yes in step S1, the process proceeds to step S2, and when it is determined No, the process proceeds to step S11.

  Step S2 is a step of switching the wind direction switching door 7 to the instrument panel side (the side that guides the cool air to the branch duct 4) and starting the cool-down operation following the determination that it is the time of cool-down in step S1. The switching of the wind direction switching door 7 is performed by a control command to the switching door actuator 9.

  Step S3 is a step of determining whether or not the inside air temperature has started to stabilize following the start of the cool-down operation in step S2. While the inside air temperature fluctuates and is not stable, the determination in step S3 is repeated, and the inside air temperature approaches the set vehicle interior temperature and the inside air temperature begins to stabilize, so that it is judged that the reduction of the vent air volume starts. And the process proceeds to step S4.

  Step S4 is a step of estimating the temperature of the panel surface 1a of the instrument panel 1 based on the internal temperature and the amount of solar radiation at the beginning of the cool-down operation following the determination that the internal temperature has started to stabilize in Step S3. is there. The inside air temperature information is obtained from the inside air temperature sensor 21. The solar radiation amount information is obtained from the solar radiation amount sensor 22.

Step S5 is a determination step for determining whether or not the panel surface temperature estimated value is equal to or higher than the first set value following the estimation of the panel surface temperature of the instrument panel 1 in step S4. When it is determined Yes in step S5, the process proceeds to step S6, and when it is determined No, the process proceeds to step S11.
Here, the first setting value, the second setting value, and the third setting value, which will be described later, are values stored in advance, and the first setting value, the second setting value, A third set value is given.
The first set value is a start threshold value for the instrument panel cooling mode, the second set value is a start threshold value for the air volume reduction control performed in the middle of the instrument panel cooling mode, and the third set value is the end of the instrument panel cooling mode. It is a threshold value.

In step S6, following the determination that the estimated panel surface temperature is greater than or equal to the first set value in step S5, the air volume during cooling down (maximum air volume) is maintained, and the instrument panel air volume blown out from the cold air outlet 6 is maximized. This is a step for controlling the opening degree of the vent door and the differential door in the air conditioning unit A / U so that the air volume is obtained by subtracting the vent air volume in the stable period from the air volume.
The total air volume control during the cool-down is performed by a control command to the blower motor 25. Further, the distribution control of the vent air volume and the cool air blowing air volume is performed by a control command to the mode door actuator 26.

  Step S7 is a step of estimating the temperature of the panel surface 1a of the instrument panel 1 based on the current inside air temperature, the amount of solar radiation, and the instrument panel blowing temperature, following the air volume control during the cool-down in step S6. The inside air temperature information is obtained from the inside air temperature sensor 21. The solar radiation amount information is obtained from the solar radiation amount sensor 22. The instrument panel blowing temperature information is obtained from the instrument panel blowing temperature sensor 23.

  Step S8 is a determination step for determining whether or not the panel surface temperature estimated value is equal to or lower than the second set value following the estimation of the panel surface temperature of the instrument panel 1 in step S7. If it is determined Yes in step S8, the process proceeds to step S9. If it is determined No, the process returns to step S6.

Step S9 is a step of gradually decreasing the air volume at the cool-down from the maximum air volume following the determination that the estimated panel surface temperature is equal to or lower than the second set value in step S8.
Here, as a method for reducing the air volume during cool-down, the air volume may be reduced stepwise or steplessly as time passes. Further, according to the decreasing gradient of the panel surface temperature estimated value, the larger the decreasing gradient, the larger the air volume decreasing allowance may be taken.

  Step S10 is a determination step for determining whether or not the panel surface temperature estimated value estimated in step S7 is equal to or less than a third set value following the air volume reduction during the cool-down in step S9. When it is determined Yes in step S10, the process proceeds to step S11. When it is determined No, the process returns to step S7.

Step S11 is a step of returning to the normal air conditioning control following the determination that the estimated panel surface temperature is not more than the third set value in step S10.
When returning to the normal air-conditioning control from the instrument panel cooling mode, the control command to the switching door actuator 9 returns the air direction switching door 7 to the side that blows air to the differential outlet 3, and the control command to the blower motor 25 is returned to the normal control command. The control command to the mode door actuator 26 is shifted to the value of the normal control command.

  Next, the operation will be described.

[Panel cooling control function]
For example, when the vehicle travels in winter when a warm-up operation is performed, the cool-down condition in step S1 is not satisfied.
Therefore, when the cool-down condition in step S1 is not satisfied, the process proceeds from step S1 to step S11 in the flowchart of FIG. 3, and normal air conditioning control is executed in step S11.

For example, in the spring or autumn driving when the cool-down operation is performed but the sun is weak and the difference between the outside temperature and the inside temperature is small, the cool-down condition of step S1 is satisfied, but the instrument panel 1 panel The surface temperature is not high, and the start condition of the instrument panel cooling mode in step S5 is not satisfied.
Accordingly, when the cool-down condition in step S1 is satisfied but the instrument panel cooling mode start condition in step S5 is not satisfied, in the flowchart of FIG. 3, step S1, step S2, step S3, step S4, step S5, step S11 are performed. Proceed to
That is, in step S2, the wind direction switching door 7 is temporarily switched to the instrument panel cooling side, but in step S11, the wind direction switching door 7 is returned to the side that blows air to the differential outlet 3, and normal air conditioning control is performed. Executed.

For example, when getting into a vehicle parked outdoors in the summer, or when driving in the summer when the cool-down operation is performed and the sun is strong and the difference between the outside temperature and the inside temperature is large. Both the condition and the start condition of the instrument panel cooling mode in step S5 are satisfied.
Therefore, when both the cool-down condition of step S1 and the start condition of the instrument panel cooling mode of step S5 are satisfied, step S1, step S2, step S3, step S4, step S5, step S6, step S7 in the flowchart of FIG. → Proceed to step S8.
Then, until it is determined in step S8 that the estimated panel surface temperature is equal to or less than the second set value, the flow of steps S6 → S7 → S8 is repeated, and in step S6, the air volume during cool-down ( The opening of the vent door and the differential door in the air conditioning unit A / U is controlled so that the instrument panel air volume blown out from the cold air outlet 6 is the same as the maximum air volume minus the stable vent air volume. The
Thereafter, when it is determined in step S8 that the estimated panel surface temperature is equal to or less than the second set value, the process proceeds from step S8 to step S9 to step S10, and in step S10, the estimated panel surface temperature is equal to or less than the third set value. Step S7 → Step S8 → Step S9 → Step S10 is repeated until it is determined that the air volume control for gradually reducing the air volume at the time of cool-down from the maximum air volume is performed in Step S9.
Thereafter, when it is determined in step S10 that the estimated panel surface temperature is equal to or smaller than the third set value, the process proceeds from step S10 to step S11, and from the instrument panel cooling mode, the air direction switching door 7 is blown to the differential outlet 3 After the transition period control of returning the air volume control to the blower motor 25 and the door opening control to the mode door actuator 26 to the normal control, the normal air conditioning control mode is restored.

[Instrument panel panel cooling]
In the instrument panel cooling device for a vehicle according to the first embodiment, the control unit 20 has a high surface temperature of the instrument panel 1, and the start-up conditions for the cool-down condition in step S1 and the instrument panel cooling mode in step S5 are as follows. When both are established, the cool air that has passed through the blower fan and the evaporator of the in-vehicle air conditioning unit A / U is led from the differential duct 2 to the branch duct 4 and is disposed in the vicinity of the front window 5 and the differential outlet 3 of the instrument panel 1. Control is performed to blow out from the cold air outlet 6.

  For this reason, as shown in the hatched area in FIG. 4, the cold air blown out from the cold air blow-out port 6 is caused by the Coanda effect that flows along the surface of the object so that it adheres to the surface of the object. It flows over the panel surface 1a of the instrument panel 1 over a wide range and falls to the vicinity of the occupant's knees while taking away the radiant heat of the instrument panel 1.

  At this time, the wind that flows along the panel surface 1a of the instrument panel 1 takes the radiant heat of the panel surface 1a and becomes warm and tends to fall to the vicinity of the knee, but as shown in FIG. Among the warm winds that fall to the vicinity, some of the winds are divided into two directions, such that some winds are directed toward the blower suction port 14 and some remaining winds are directed toward the occupant side. However, the warm wind that tends to go to the occupant side is removed by the cold air from the vent outlet 13, and the influence on the occupant that the warm wind blows toward the occupant is suppressed.

  Therefore, when the instrument panel 1 becomes high temperature due to the influence of solar radiation, high outside air temperature, etc., the panel surface 1a is used as a heat source by the direct forced cooling action of cooling the panel surface 1a itself that is a heat source of radiant heat. Radiant heat can be effectively suppressed.

  Due to the effect of suppressing the radiant heat from the panel surface 1a, it is possible to greatly reduce the time required for the cool-down of the passenger compartment temperature when boarding in summer or the like, and there is a difference between the passenger compartment temperature and the passenger compartment temperature. During cooling running in summer and the like, fluctuations in the cabin temperature are suppressed and stable, and comfort can be improved.

In the first embodiment, a branch duct 4 that branches from a midway position of the duct toward the differential outlet 3 of the instrument panel 1 among the differential ducts 2 connected to the air conditioning unit A / U is used as the cold air duct. The cold air outlet 6 is arranged in the vicinity of the differential outlet 3 of the instrument panel 1, and when the wind direction switching door 7 provided at the branch position of the differential duct 2 is switched to the branch duct selection side, the differential duct 2 The cool air guided to the air is blown out along the panel surface 1a of the instrument panel 1.
Therefore, the air volume blown in the conventional differential mode can be blown out along the panel surface 1a of the instrument panel 1, and a large air volume advantageous for cooling the panel surface 1a can be secured. This means that the application of the air conditioning unit A / U is specialized for the new use of cooling the instrument panel 1 in addition to the conventional use of air conditioning control in each selection mode. it can.

In the first embodiment, when both the cool-down condition in step S1 and the start condition for the instrument panel cooling mode in step S5 are satisfied, the process continues until step S8 determines that the estimated panel surface temperature is equal to or lower than the second set value. Vent door in the air conditioning unit A / U so that the air volume at the cool-down (maximum air volume) is maintained in S6 and the instrument panel air volume blown out from the cold air outlet 6 is the maximum air volume minus the vent air volume during the stable period. And the opening degree of the differential door is controlled.
That is, when transitioning from the cooling transition period to the stable period and reducing the air volume of the vent, the panel surface 1a of the instrument panel 1 is cooled by the excess when the air volume of the vent is reduced without reducing the overall air volume. It distributes as the amount of air to be.
Therefore, in the start area of the instrument panel cooling mode, the panel surface 1a of the instrument panel 1 can be effectively cooled with good response by the cold air having a high air flow rate.

When it is determined in step S8 that the estimated panel surface temperature is equal to or lower than the second set value, the cool in step S9 until it is determined in step S10 that the estimated panel surface temperature is equal to or lower than the third set value. Air volume control is performed to gradually reduce the air volume during down from the maximum air volume.
Therefore, cooling of the panel surface 1a of the instrument panel 1 proceeds, and in the region where the instrument panel cooling mode is ended, the fan noise and vibration are suppressed by gradually reducing the air volume, giving the passenger a sense of incongruity. It is possible to smoothly return to the normal air conditioning control mode.

Next, the effect will be described.
In the vehicle instrument panel cooling apparatus of the first embodiment, the following effects can be obtained.

  (1) A cool air source for generating cool air, a cool air duct for guiding the cool air from the cold air source to an inner position of the instrument panel 1, and a position near the front window 5 of the instrument panel 1, and the cool air When the surface temperature of the instrument panel 1 is high, the cool air blowing port 6 that blows out the cold air guided from the duct along the panel surface 1a of the instrument panel 1 and the cold air blowing out the cold air guided to the cold air duct. Panel cooling control means for performing control to blow out from the mouth 6, so that the radiant heat from the panel surface 1 a can be effectively suppressed when the instrument panel 1 becomes high temperature due to the influence of solar radiation or high outside air temperature. .

  (2) Since the cold air source is an in-vehicle air conditioning unit A / U having a blower fan and an evaporator, an instrument is obtained while reducing the cost of the existing air conditioning unit A / U to the vehicle as a cold air source. The panel surface 1a of the panel 1 can be cooled.

  (3) The cold air duct is a branch duct 4 that branches from a midway position of the duct toward the differential outlet 3 of the instrument panel 1 among the differential ducts 2 connected to the air conditioning unit A / U. The air outlet 6 is disposed in the vicinity of the differential air outlet 3 of the instrument panel 1 and is guided to the differential duct 2 when the wind direction switching door 7 provided at the branch position of the differential duct 2 is switched to the branch duct selection side. Since the cold air is blown out along the panel surface 1a of the instrument panel 1, the instrument panel 1 can be used as an air conditioning unit A / U by ensuring a large air volume simply by adding the branch duct 4 and the wind direction switching door 7. It can be specialized for the new use of cooling.

  (4) The instrument panel 1 has a differential outlet 3, a cold air outlet 6, a vent outlet 13, and a blower suction from the upstream side of the panel near the front window 5 toward the downstream side of the panel along the flow of cold air. Since the openings 14 are arranged in order, it is possible to suppress the influence on the occupant that the wind that has been warmed by radiating heat from the panel surface 1a of the instrument panel 1 is blown out toward the occupant.

  (5) The panel cooling control means (FIG. 3) switches the wind direction switching door 7 to the branch duct selection side during cool-down when there is a difference between the actual vehicle interior temperature and the set vehicle interior temperature. When the surface temperature of the instrument panel 1 is equal to or higher than the set value, the instrument panel cooling mode for blowing out the cold air from the cold air outlet 6 is started. The panel surface 1a of the instrument panel 1 can be cooled.

  (6) The panel cooling control means (FIG. 3) sets the first set value, the second set value, and the third set value as the set value of the surface temperature of the instrument panel 1 in order from a high value to a low value. When the surface temperature of the instrument panel 1 is equal to or higher than the first set value (step S5), the air volume from the cold air outlet 6 is given by the difference between the maximum air volume during the cool-down and the vent air volume during the stable period. The instrument panel cooling mode is started (step S6), and when the surface temperature of the instrument panel 1 falls below the second set value (step S8), the instrument panel cooling mode is continued while gradually decreasing the maximum air volume at the time of cool-down. When the surface temperature of the instrument panel 1 becomes equal to or lower than the third set value (step S10), the instrument panel cooling mode is terminated and the normal air conditioning control is resumed. (Step S11), the panel panel 1a has a high cooling effect in the start area of the instrument panel cooling mode, and the smooth return to the normal air conditioning control mode by suppressing fan noise and vibration in the area where the instrument panel cooling mode ends. Can be achieved.

  (7) The panel cooling control means (FIG. 3) switches the wind direction switching door 7 to the branch duct selection side based on the cool-down determination (step S2), and then waits for the internal temperature to start to stabilize. The surface temperature of the instrument panel 1 is estimated from the air temperature and the amount of solar radiation (steps S3 and S4), and after the instrument panel cooling mode in which the cold air is blown out from the cold air outlet 6 (step S6), Since the surface temperature of the instrument panel 1 is estimated from the cold air blowing temperature, the instrument panel cooling mode is started without adding a new panel surface temperature sensor, while being a cost-effective device using an existing sensor. The surface temperature of the instrument panel 1 before and after can be accurately estimated.

  As mentioned above, although the instrument panel cooling device for vehicles of the present invention was explained based on Example 1, it is not restricted to this Example 1 about a concrete composition, and each claim of a claim Design changes and additions are permitted without departing from the spirit of the invention.

  In the first embodiment, an example in which a branch duct from the differential duct of the air conditioning unit A / U is used as the cold air duct, but an example in which a branch duct from the vent duct of the air conditioning unit A / U is used as the cold air duct. good.

  In Example 1, although the example which estimates the surface temperature of an instrument panel using the internal temperature information used as control information of air-conditioning unit A / U, the amount of solar radiation information, etc. was shown, for example, an instrument panel A temperature sensor such as a thermocouple may be set on the panel surface by being attached to the panel surface or embedded in the panel surface, and the panel surface temperature may be directly detected.

  In the first embodiment, as the panel cooling control means, an example in which the cool air is blown along the panel surface of the instrument panel by interlocking the cool-down operation is shown. When the air temperature is high, control may be performed to blow out the cold air from the cold air outlet so as to converge to the preset target temperature. In short, the panel cooling control means is not limited to the first embodiment as long as it performs control to blow out the cold air guided to the cold air duct from the cold air outlet when the surface temperature of the instrument panel is high.

  In the first embodiment, an example of a vehicle instrument panel cooling device using an in-vehicle air conditioning unit A / U as a cold air source has been shown. However, the cold air source is newly set independently of the air conditioning unit A / U. A cold air source may be used, or an in-vehicle cold air source other than the air conditioning unit A / U may be used. In short, the vehicle instrument panel cooling device of the present invention can be applied to any vehicle provided with a cold air source for generating cold air.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall system diagram illustrating a vehicle instrument panel cooling device according to a first embodiment. FIG. 3 is an exploded perspective view showing an instrument panel, a differential duct, a wind direction switching door, and a switching door actuator in the vehicle instrument panel cooling device of the first embodiment. 6 is a flowchart showing a flow of panel cooling control processing of the instrument panel 1 executed by the control unit 20 of the first embodiment. It is a perspective view explaining the panel surface cooling effect | action of the instrument panel in the vehicle carrying the instrument panel cooling device for vehicles of Example 1. FIG. It is a schematic side view explaining the panel surface cooling effect | action of the instrument panel in the vehicle carrying the instrument panel cooling device for vehicles of Example 1. FIG.

Explanation of symbols

A / U On-vehicle air conditioning unit 1 Instrument panel 1a Panel surface 2 Differential duct 3 Differential outlet 4 Branch duct 5 Front window 6 Cold wind outlet 7 Wind direction switching door 8 Door shaft 9 Switching door actuator 10 First door seal 11 Second door seal 12 Duct seal 13 Vent outlet 14 Blower inlet 20 Control unit 21 Internal air temperature sensor 22 Solar radiation sensor 23 Instrument panel outlet temperature sensor 24 Other sensors and switches 25 Blower motor 26 Mode door actuator

Claims (7)

A cold air source that produces cold air,
A cold air duct for guiding the cold air from the cold air source to an inner position of the instrument panel;
A cold air outlet that is arranged near the front window of the instrument panel and blows out the cold air guided from the cold air duct along the panel surface of the instrument panel;
When the surface temperature of the instrument panel is high, panel cooling control means for performing control to blow out the cold air led to the cold air duct from the cold air outlet,
An instrument panel cooling device for a vehicle, comprising: In the vehicle instrument panel cooling device according to claim 1,
The instrument panel cooling device for a vehicle, wherein the cold air source is an in-vehicle air conditioning unit having a blower fan and a heat exchanger for cooling. In the vehicle instrument panel cooling device according to claim 2,
The cold air duct is a branching duct that branches from a midway position of the duct toward the differential outlet of the instrument panel among the differential ducts connected to the air conditioning unit,
The cold air outlet is arranged in the vicinity of the differential air outlet of the instrument panel, and when the wind direction switching door provided at the branch position of the differential duct is switched to the branch duct selection side, the cold air guided to the differential duct is introduced. An instrument panel cooling device for a vehicle, wherein the instrument panel is blown out along the surface of the instrument panel. In the instrument panel cooling device for a vehicle according to claim 2 or claim 3,
The instrument panel is arranged such that a differential outlet, a cold air outlet, a vent outlet, and a blower inlet are arranged in this order from the upstream side of the panel near the front window toward the downstream side of the panel along the flow of cold air. An instrument panel cooling device for vehicles. In the vehicle instrument panel cooling device according to claim 4,
The panel cooling control means switches the wind direction switching door to the branch duct selection side at the time of cool-down when there is a difference between the actual vehicle interior temperature and the set vehicle interior temperature, and the surface temperature of the instrument panel is a set value. When it is above, the instrument panel cooling device for vehicles which starts the instrument panel cooling mode which blows off cool air from the cold air outlet. In the vehicle instrument panel cooling device according to claim 5,
The panel cooling control means gives a first set value, a second set value, and a third set value in order from a high value to a low value as a set value of the surface temperature of the instrument panel,
When the instrument panel surface temperature is equal to or higher than the first set value, the air flow from the cold air outlet is given by the difference between the maximum air flow during the cool-down and the vent air flow during the stable period, and the instrument panel cooling mode is started. When the surface temperature of the instrument panel falls below the second set value, the instrument panel cooling mode is continued while gradually decreasing the maximum air volume during cool down, and when the surface temperature of the instrument panel falls below the third set value, An instrument panel cooling device for a vehicle, wherein the instrument panel cooling mode is ended and the normal air-conditioning control is restored. The instrument panel cooling device for a vehicle according to any one of claims 5 to 6,
The panel cooling control means switches the wind direction switching door to the branch duct selection side based on the determination of cool down, and then waits for the internal temperature to start to stabilize, and the surface temperature of the instrument panel according to the internal temperature and the amount of solar radiation. The instrument panel for a vehicle is characterized by estimating the surface temperature of the instrument panel from the inside air temperature, the amount of solar radiation and the cold air blowing temperature after starting the instrument panel cooling mode in which cold air is blown out from the cold air blowing port. Cooling system.

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