JP2015083441A - Vehicular heating apparatus and program for driving the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent heat damage from being caused to the periphery by heating a protective part.SOLUTION: A radiant heating controller 12 controls drive of a radiant heat generation part 14A to prevent heat damage to the periphery. Specifically, the radiant heating controller 12 estimates a surface temperature of a protective lattice 14B, and controls the drive of the radiant heat generation part 14A so that the surface temperature of the protective lattice 14B can be equal to or lower than a predetermined temperature capable of preventing the heat damage to the periphery.

Description

  The present invention relates to a vehicle heating device that heats using radiant heat and a vehicle heating device drive program.

  A general vehicle heating device heats the vehicle interior by circulating engine coolant through a heat exchanger provided in the vehicle interior. 2. Description of the Related Art In recent years, with the spread of hybrid vehicles, electric vehicles, and the like, it is known that the interior of a vehicle is heated together with heating using radiant heat such as an electric heater.

  For example, Patent Literature 1 discloses a vehicle interior air conditioner that controls a vehicle interior air conditioner by calculating a necessary air outlet temperature in accordance with environmental information outside the vehicle interior and vehicle driving information, and includes a step of the air conditioner unit. In a vehicle heating apparatus comprising a vehicle interior air conditioner in which the blowout air volume is adjustable, and a radiant heat heating device that heats the occupant's foot atmosphere, It has been proposed to control the vehicle interior air conditioner and the radiant heat heater so that the mutual ratio with the input power has the same temperature sensation in the passenger's foot.

JP 2012-192829 A

  However, the technique of Patent Document 1 has room for improvement because it does not consider the heat damage to the periphery of the vehicle heating device using radiant heat.

  Moreover, even if a protective part such as a protective lattice is provided in a heating device using radiant heat, it is conceivable that the surface temperature of the protective part itself increases and causes heat damage to the surroundings.

  The present invention has been made in consideration of the above-described facts, and an object thereof is to prevent heat damage to the surroundings due to heating of the protective part.

  In order to achieve the above object, the invention according to claim 1 estimates and estimates the surface temperature of a radiant heat generating part for heating using radiant heat and a protective part for preventing contact with the radiant heat generating part. And a control unit that controls driving of the radiant heat generation unit so that the surface temperature of the protection unit is equal to or lower than a predetermined temperature that can prevent heat damage to the surroundings based on the result.

  According to the first aspect of the present invention, the radiant heat generator generates radiant heat to heat the passenger compartment.

  In the control unit, the surface temperature of the protection unit for preventing contact with the radiant heat generation unit is estimated, and based on the estimation result, the surface temperature of the protection unit is not more than a predetermined temperature that can prevent heat damage to the surroundings. In addition, the drive of the radiant heat generating unit is controlled.

  That is, although there is a concern about heat damage to the surroundings due to heating of the protective part, the temperature of the protective part is estimated and the drive of the radiant heat generating part is controlled so that it is below a predetermined temperature. Heat damage can be reliably prevented.

  In addition, the control part can estimate the surface temperature of a protection part based on vehicle interior temperature like the invention of Claim 2. In this case, as in the invention described in claim 3, the control unit has a predetermined comfort corresponding to the target blowing temperature of the air conditioner that air-conditions the passenger compartment, the set temperature of the air conditioner, or the outside air temperature. You may make it control the drive of the said radiant heat generating part so that it may become the temperature of the lower one of the target temperature of the determined said radiant heat generating part, and the estimated said surface temperature. As a result, both comfort and prevention of heat damage to the surroundings can be achieved.

  Moreover, this invention may be made to further provide the reflective layer which is provided in the radiant heat generation part side of the protection part and reflects radiant heat like the invention of Claim 4. That is, since radiant heat is reflected by the reflective layer, heating of the protective part is suppressed.

  In addition, this invention is good also as a heating apparatus drive program for vehicles for functioning a computer as a control part as described in any one of Claims 1-4 like the invention of Claim 5.

  As described above, according to the present invention, there is an effect that it is possible to prevent heat damage to the surroundings due to heating of the protection unit.

It is a figure which shows the general vehicle mounting position of the heating apparatus for vehicles which concerns on embodiment of this invention. (A) is a perspective view which shows schematic structure of a radiant heat generator, (B) is sectional drawing of the dotted-line part of (A). It is a block diagram which shows schematic structure of the heating apparatus for vehicles which concerns on embodiment of this invention. (A) is a figure which shows the example which mapped temperature Ttao of the radiant heat generation part 14A determined by the comfort with respect to the target blowing temperature TAO of an air conditioner, (B) is the surface temperature of a protection grid, and prevents thermal damage to the periphery It is a figure which shows the example which mapped the upper limit temperature (output) Tb of the radiant heat generation part estimated from the vehicle interior temperature TR so that it might become below the upper limit temperature for It is a flowchart which shows an example of the flow of the process performed with the radiant heating controller of the heating apparatus for vehicles which concerns on embodiment of this invention. It is a flowchart which shows an example of the flow of target temperature T0 process.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a diagram showing a schematic vehicle mounting position of a vehicle heating apparatus according to an embodiment of the present invention.

  The vehicle heating device 10 according to the present embodiment includes a radiant heat heating controller 12 and a radiant heat generator 14 as shown in FIG.

  The radiant heat generator 14 is provided with a protective grid 14B on the occupant side serving as the heat radiating side. In the radiant heat generating device 14, the radiant heat generating unit 14 </ b> A is controlled by the radiant heat heating controller 12.

  In the present embodiment, the radiant heat heating controller 12 is connected to the radiant heat generating unit 14 </ b> A and an air conditioner 20 that air-conditions the passenger compartment. The radiant heat heating controller 12 generates radiant heat from the air conditioner 20. In order to control the driving of the unit 14A, the detection result of the passenger compartment temperature is acquired and the radiant heat generating unit 14A is controlled.

  For example, as illustrated in FIG. 1, the radiant heat generation unit 14 </ b> A is provided near the occupant's feet below the instrument panel, and heats the occupant's feet with radiant heat. For the radiant heat generating unit 14A, for example, various heating elements such as an electric heater wire or a resistor having PTC characteristics can be applied.

  FIG. 2A is a perspective view illustrating a schematic configuration of the radiant heat generating device 14, and FIG. 2B is a cross-sectional view taken along a dotted line in FIG.

  The radiant heat generating device 14 is provided with a protective grid 14B on the front surface side (occupant side) which is the heat radiation side of the radiant heat generating unit 14A, and is configured so that the occupant cannot directly touch the radiant heat generating unit 14A.

  Further, as shown in FIG. 2B, a reflective layer 14C is provided on the side of the radiant heat generating unit 14A of the protective grid 14B, and heat transfer of radiant heat is suppressed by the reflective layer 14C. That is, the radiant heat transfer from the radiant heat generating portion 14A to the protective grid 14B and the convective heat transfer due to the surrounding convection are conducted to the protective grid 14B by heat conduction, but are partially reflected by the reflective layer 14C. The heat generation of the protective grid 14B is suppressed. Thereby, the heat damage to the periphery of the radiant heat generator 14 is suppressed.

  FIG. 3 is a block diagram showing a schematic configuration of the vehicle heating apparatus 10 according to the embodiment of the present invention.

  The vehicle heating device 10 includes the radiant heat heating controller 12 and the radiant heat generator 14 as described above. Further, the vehicle heating apparatus 10 is provided with a radiant heat heating switch 16 for turning on / off generation of radiant heat by the radiant heat generating unit 14 </ b> A, and is connected to the radiant heat heating controller 12.

  On the other hand, the air conditioner 20 connected to the radiant heat heating controller 12 includes a general refrigerant cycle. In FIG. 3, an example of the air conditioner 20 provided with the general refrigerant cycle is shown.

  That is, in the air conditioner 20, a refrigeration cycle is constituted by a refrigerant circulation path including the compressor 21, the condenser 23, the expansion valve 18, and the evaporator 27.

  The compressor 21 compresses the refrigerant and circulates the circulation path. The compressor 21 may be mechanically driven using the power of the vehicle, or may be driven without the power of the vehicle by applying an electric compressor. In the case of mechanical driving, on / off of the compressor 21 can be controlled by an electromagnetic clutch that performs transmission / reception of power. When a mechanically driven compressor is applied, the air conditioner 20 can be mounted on a vehicle that travels with the power of an internal combustion engine such as an engine, a hybrid vehicle that includes an engine and a motor, and the like. In addition to the above, the air conditioner 20 can be mounted on an electric vehicle or the like.

  The evaporator 27 cools the air passing through the evaporator 27 (hereinafter referred to as air after the evaporator) by vaporizing the refrigerant that has been compressed and liquefied. At this time, the evaporator 27 cools the passing air so as to condense moisture in the air, whereby the air after the evaporator 27 is dehumidified.

  The expansion valve 18 provided on the upstream side of the evaporator 27 reduces the liquefied refrigerant abruptly and supplies it to the evaporator in the form of a mist. The vaporization efficiency of the refrigerant is improved.

  The evaporator 27 of the air conditioner 20 is provided inside the air conditioning duct 38. The air conditioning duct 38 is open at both ends, and air intake ports 40 and 42 are formed at one opening end. Further, a plurality of air outlets 44 (44A, 44B, and 44C are shown as an example in the present embodiment) that are opened toward the vehicle interior are formed at the other opening end. Examples of the air outlet 44 include an outlet (DEF) that blows out toward the glass, an outlet (FACE) that blows out toward the occupant, and an outlet (FOOT) that blows out toward the feet.

  The air inlet 42 communicates with the outside of the vehicle and can introduce outside air into the air conditioning duct 38. Further, the air intake port 40 communicates with the passenger compartment so that air (inside air) in the passenger compartment can be introduced into the air conditioning duct 38. The air outlet 44 is, for example, a defroster outlet 44A that blows out air toward the windshield glass, a side and center register outlet 44B, and a foot outlet 44C.

  In the air conditioning duct 38, a blower fan 46 for blowing air for air conditioning is provided between the evaporator 27 and the air intake ports 40 and 42. A mode switching damper 48 is provided in the vicinity of the air intake ports 40 and 42. The mode switching damper 48 opens and closes the air intake ports 40 and 42 by the operation of an actuator such as the mode switching damper motor 24.

  The blower fan 46 is rotated by driving the blower motor 22, sucked into the air conditioning duct 38 from the air intake port 40 to the air intake port 42, and further sends this air toward the evaporator 27. At this time, outside air or inside air is introduced into the air conditioning duct 38 in accordance with the open / close state of the air intake ports 40 and 42 by the mode switching damper 48. That is, the mode switching damper 48 switches between the inside air circulation mode and the outside air introduction mode.

  An air mix damper 50 and a heater core 52 are provided downstream of the evaporator 27. The air mix damper 50 is rotated by driving the air mix damper motor 36 and adjusts the amount of air after the evaporator 27 that passes through the heater core 52 and the amount that bypasses the heater core 52. The heater core 52 circulates engine coolant and heats the air guided by the air mix damper 50 with the engine coolant.

  The air after the evaporator 27 is guided to the heater core 52 according to the opening degree of the air mix damper 50 and heated, and further mixed with the air not heated by the heater core 52 and then sent to the air outlet 44. Is done. In the air conditioner 20, the air mix damper 50 is controlled to adjust the amount of air heated by the heater core 52, thereby adjusting the temperature of the air blown out from the air blowing port 44 toward the vehicle interior.

  In the vicinity of each air outlet 44, an outlet switching damper 54 is provided correspondingly. In the air conditioner 20, the air outlet 44A, 44B, 44C is opened and closed by these outlet switching dampers 54, whereby the temperature-adjusted air can be blown out from a desired position into the vehicle interior.

  The air conditioner 20 includes an air conditioner ECU (Electronic Control Unit) 11 for performing various controls of the air conditioner 20. The air conditioner ECU 11 includes the blower motor 22, the mode switching damper motor 24, the air mix damper motor 36, the outlet switching damper motor 34, the compressor 21, the outside air temperature sensor 32, the inside air temperature sensor 30, the solar radiation sensor 28, glass, and the like. The humidity sensor 13 and the glass temperature sensor 15 are connected, and an operation unit 19 for performing various operations of the air conditioner 20 such as temperature setting of the air conditioner 20 and selection of the outlet is connected. Detection values of the sensor 32, the inside air temperature sensor 30, the solar radiation sensor 28, the glass humidity sensor 13, and the glass temperature sensor 15 are input to the air conditioner ECU 11, and the vehicle is set according to the setting of the operation unit 19 based on the detection result of each sensor. Indoor air conditioning control is performed. The glass humidity sensor 13 and the glass temperature sensor 15 are respectively provided on the glass. The glass humidity sensor 13 detects the humidity in the vehicle interior (particularly near the glass), and the glass temperature sensor 15 detects the glass atmosphere temperature. To do. Moreover, although the glass humidity sensor 13 and the glass temperature sensor 15 are shown separately, they may be integrated. The glass humidity sensor 13 and the glass temperature sensor 15 may be omitted.

  Further, the air conditioner ECU 11 is connected to an engine ECU 25 that controls the operation of the engine. In the present embodiment, the detected value of the water temperature sensor 17 that detects the coolant temperature of the engine coolant that is input to the engine ECU 25 is input to the air conditioner ECU 11. In this embodiment, an example in which the detected value of the water temperature sensor 17 is input to the air conditioner ECU 11 via the engine ECU 25 is shown, but the water temperature sensor 17 may be directly connected to the air conditioner ECU 11.

  The air conditioner ECU 11 controls the blower motor 22, the compressor 21, the mode switching damper motor 24, the air mix damper motor 36, the outlet switching damper motor 34, and the like based on the detection value of each sensor, thereby Air conditioning is to be performed.

  As an example of various controls performed by the air conditioner ECU 11, for example, when the ignition switch is turned on, the target blowing temperature is obtained by the following (1) based on the detection result of each sensor, the setting content of the operation unit 19, and the like. Air-conditioning control is performed so that the target blowing temperature is reached.

  Tao = k1, Tset-k2, Ta-k3, Tr-k4, ST + C (1)

  Here, k1, k2, k3, k4, and C represent constants, Tset represents the set temperature, Tr represents the cabin temperature, Ta represents the outside temperature, and ST represents the amount of solar radiation.

  When the air conditioner ECU 11 performs air conditioning control, the compressor 21 on / off control, the drive control of the air mix damper motor 36, the switching control of the air outlet 44, and the air intake 40 according to the target outlet temperature and the like. , 42 (the so-called auto air conditioner control) such as switching control (mode switching control in the inside air circulation mode and the outside air introduction mode). The switching control of the air intake ports 40 and 42 may be performed manually by the occupant operating the operation unit 19.

  Further, when the humidity detected by the glass humidity sensor 13 is equal to or higher than a predetermined threshold humidity, the air conditioner ECU 11 also performs anti-fogging control by controlling the compressor 21 to be turned on and dehumidifying it. It has become.

  The air conditioner ECU 11 controls the blower motor 22 so as to prevent a cold wind in winter when the water temperature detected by the water temperature sensor 17 is equal to or lower than a predetermined threshold water temperature.

  By the way, in the vehicle heating device 10 configured as described above, the reflection layer 14C provided on the protective grid 14B can suppress heat damage to the periphery of the radiant heat generation device 14 as described above. If the radiant heat generating unit 14A is simply driven, it is considered that heat damage to the surroundings occurs.

  Therefore, in the vehicle heating apparatus 10 according to the present embodiment, the radiant heat heating controller 12 controls the driving of the radiant heat generating unit 14A so as to prevent heat damage to the surroundings. Specifically, the radiant heat heating controller 12 estimates the surface temperature of the protective grid 14B, so that the surface temperature of the protective grid 14B is equal to or lower than a predetermined temperature at which heat damage to the surroundings can be prevented. The drive is controlled.

  Specifically, the estimation of the surface temperature of the protective grid 14B estimates the temperature of the radiant heat generation unit 14A corresponding to the surface temperature of the protective grid 14B based on the vehicle interior temperature. For example, as shown in FIG. 4B, the upper limit temperature (output) of the radiant heat generator 14A estimated from the vehicle interior temperature TR so that the surface temperature of the protective grid 14B is equal to or lower than the upper limit temperature for preventing thermal damage to the surroundings. ) The surface temperature of the protective grid 14B is estimated by mapping Tb and obtaining the upper limit temperature Tb of the radiant heat generator 14A from the vehicle interior temperature TR. Note that the map in FIG. 4B is not limited to a straight line, and is determined in consideration of, for example, the distance between the radiant heat generator 14A and the protective grid 14B, the size of the vehicle interior for each vehicle type, and the like.

  Further, in the present embodiment, as shown in FIG. 4A, the temperature Ttao of the radiant heat generation unit 14A determined by the comfort with respect to the target blowout temperature TAO of the air conditioner 20 is mapped, and the comfort from the target blowout temperature. The determined temperature Ttao of the radiant heat generating unit 14A is obtained. Note that the map in FIG. 4A is not limited to a straight line, and is determined in consideration of the air conditioning capability of the air conditioner 20, for example.

  Then, based on the obtained upper limit temperature Tb of the radiant heat generator 14A corresponding to the surface temperature of the protective grid 14B and the temperature Ttao of the radiant heat generator 14A determined from the radiation comfort, the target temperature T0 of the radiant heat generator 14A. Ask for. Specifically, it is obtained from the target temperature T0 = Min (Ttao, Tb). That is, the lower one of the upper limit temperature Tb and the temperature Ttao is obtained as the target temperature T0, and the radiant heat generating unit 14A is driven.

  The drive control of the radiant heat generating unit 14A is controlled by, for example, driving by applying a pulse voltage and changing the duty ratio so that the target temperature is reached.

  In this embodiment, the vehicle interior temperature for estimating the surface temperature of the protective grid 14B is obtained from the detection result of the internal air temperature sensor 30 from the air conditioner ECU 11 of the air conditioner 20, but the detection result of the internal air temperature sensor 30 is obtained. May be obtained directly.

  Further, in the present embodiment, the target blowing temperature TAO for obtaining the temperature Ttao of the radiant heat generating unit 14A determined by comfort is acquired from the air conditioner ECU 11, but the outside air temperature, the set temperature, etc., instead of the target blowing temperature TAO May be acquired and used. That is, the temperature Ttao of the radiant heat generating unit 14A determined by the comfort with respect to the outside air temperature and the set temperature of the air conditioner 20 is mapped, and the temperature Ttao of the radiant heat generating unit 14A determined by the comfort is obtained from the outside air temperature and the set temperature. Also good. For example, by configuring the temperature Ttao of the radiant heat generation unit 14A determined by comfort from the set temperature, it can be applied to an inexpensive vehicle that does not have the functions such as the above-described auto air conditioner control and anti-fogging control. It becomes.

  Then, the specific process performed with the radiant heat heating controller 12 of the heating apparatus 10 for vehicles comprised as mentioned above is demonstrated. FIG. 5 is a flowchart showing an example of a flow of processing performed by the radiant heat heating controller 12 of the vehicle heating device 10 according to the embodiment of the present invention.

  When an ignition switch (not shown) is turned on and the radiant heat heating controller 12 is activated, it is determined in step 100 whether or not the radiant heat heating switch 16 is turned on. The process waits until the determination is affirmed and the process proceeds to step 102.

  In step 102, a target temperature T0 calculation process is performed, and the routine proceeds to step 104. Here, the target temperature T0 calculation process will be described with reference to FIG. FIG. 6 is a flowchart showing an example of the flow of the target temperature T0 process.

  When the process proceeds to the target temperature calculation process, in step 200, the detection result of the internal temperature sensor 30 is acquired from the air conditioner ECU 11 of the air conditioner 20, and the process proceeds to step 202.

  In step 202, the upper limit temperature Tb of the radiant heat generating portion 14A corresponding to the surface temperature of the protective grid 14B is estimated, and the routine proceeds to step 204. That is, the upper limit temperature Tb of the radiant heat generating portion 14A is estimated from the passenger compartment temperature using a map as shown in FIG.

  In step 204, the target blowing temperature TAO is acquired from the air conditioner ECU 11 of the air conditioner 20, and the process proceeds to step 206.

  In step 206, the temperature Ttao of the radiant heat generating unit 14A determined by comfort is calculated from the target blowing temperature TAO, and the routine proceeds to step 208. That is, the temperature Ttao of the radiant heat generating unit 14A is calculated from the target blowing temperature TAO using a map as shown in FIG.

  In step 208, based on the obtained upper limit temperature Tb of the radiant heat generation unit 14A corresponding to the surface temperature of the protective grid 14B and the temperature Ttao of the radiant heat generation unit 14A determined from comfort, the target temperature T0 = Min (Ttao , Tb), the target temperature T0 of the radiant heat generator 14A is calculated, and the target temperature T0 calculation process is terminated.

  When the target temperature T0 calculation process ends, in step 104, the duty of the drive pulse of the radiant heat generating unit 14A is corrected, and the routine proceeds to step 106. That is, the duty ratio is corrected so that the target temperature T0 is reached. For example, the correspondence relationship between the duty ratio and the temperature of the radiant heat generating unit 14A is obtained in advance, thereby correcting the duty ratio corresponding to the target temperature T0 to drive the radiant heat generating unit 14A.

  In step 106, the target temperature T0 calculation process described above is performed again, and the routine proceeds to step 108. That is, in the present embodiment, the target temperature T0 is constantly updated in accordance with changes in the set temperature, the inside air temperature, the amount of solar radiation, and the like.

  In step 108, it is determined whether or not the radiant heat heating switch 16 has been turned off. If the determination is affirmative, the process returns to step 100 and the above processing is repeated, and if the determination is negative, the process proceeds to step 110. To do.

  In step 110, it is determined whether or not the surface temperature of the radiant heat generating portion 14A is the calculated target temperature T0. For example, the surface temperature of the radiant heat generating unit 14A is estimated from the current duty ratio, and it is determined whether or not the estimated surface temperature is the target temperature T0 or whether the target temperature To is within a predetermined range. If the determination is negative, the process returns to step 104 and the above process is repeated. If the determination is affirmative, the process returns to step 106 and the above process is repeated.

  That is, in the vehicle heating apparatus 10 according to the present embodiment, the surface temperature of the protective grid 14B is estimated, and the radiant heat generating unit 14A is driven so that the surface temperature becomes a temperature that prevents thermal damage to the surroundings. Since the control is performed as described above, heat damage to the periphery can be surely prevented.

  Further, since the above control is performed using the existing inside air temperature sensor 30 without providing a sensor for detecting the surface temperature of the protective grid 14B, an inexpensive configuration can be achieved.

  In the above embodiment, the upper limit temperature Tb of the radiant heat generation unit 14A estimated from the vehicle interior temperature TR so as to be equal to or lower than the upper limit temperature for preventing heat damage to the surroundings, and the radiant heat generation unit 14A determined by comfort. The temperature Ttao, whichever is smaller, is obtained as the target temperature T0, and the drive is controlled so that the radiant heat generator 14A reaches the target temperature T0. The drive may be controlled so as to reach the target temperature T0, with the upper limit temperature Tb of the radiant heat generation unit 14A estimated from the vehicle interior temperature TR being equal to or lower than the upper limit temperature as the target temperature T0.

  Further, the processing performed by the radiant heating controller 12 in each of the above embodiments may be stored and distributed as a program in a storage medium or the like.

10 Vehicle Heating Device 12 Radiant Heating Controller (Control Unit)
14 radiant heat generator 14A radiant heat generator 14B protective grid (protector)
14C Reflective layer 30 Inside air temperature sensor

Claims (5)

A radiant heat generator that generates radiant heat and heats the interior of the vehicle;
Estimating the surface temperature of the protective part for preventing contact with the radiant heat generating part, and based on the estimation result, so that the surface temperature of the protective part is below a predetermined temperature that can prevent thermal damage to the surroundings, A control unit for controlling driving of the radiant heat generation unit;
A vehicle heating device comprising:   The vehicle heating device according to claim 1, wherein the control unit estimates a surface temperature of the protection unit based on a vehicle interior temperature.   The control unit is a target blowing temperature of an air conditioner that air-conditions a vehicle interior, a set temperature of the air conditioner, or a target temperature of the radiant heat generation unit that is determined by a predetermined comfort corresponding to an outside air temperature, and the estimated The vehicle heating device according to claim 2, wherein the driving of the radiant heat generation unit is controlled so as to be a lower one of the temperatures of the radiant heat generation unit corresponding to the surface temperature.   The vehicle heating device according to any one of claims 1 to 3, further comprising a reflective layer that is provided on the radiant heat generation unit side of the protection unit and reflects radiant heat.   The vehicle heating apparatus drive program for functioning a computer as a control part of any one of Claims 1-4.

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