JP3918546B2 - Air conditioner for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle air conditioner capable of adjusting the temperature of blown air temperature, and more particularly to blown temperature control during warm-up.
[0002]
[Prior art]
As a conventional vehicle air conditioner, for example, a refrigeration cycle, a heating unit that uses engine cooling water as a heat source, and a temperature control unit that controls the amount of air heated by the heating unit are provided, and the temperature control unit is sent from a blower. After the cooled air is cooled by the cooling means of the refrigeration cycle, the hot air passing through the heating means and the cold air bypassing the heating means are mixed and blown out from the outlet opening in the vehicle interior. The vehicle interior is air-conditioned.
[0003]
The air blown out from the outlet is provided with, for example, an air mix door which is a temperature adjusting means for adjusting the air volume ratio between the air volume of the warm air passing through the heating means and the air volume of the cold air bypassing the heating means. It is also known that the blowout temperature is adjusted by controlling the opening of the air mix door.
[0004]
Therefore, as a calculation means for controlling the opening degree of the air mix door, for example, there is one disclosed in Japanese Patent No. 2769073. According to this publication, a target blowing temperature is obtained based on a setting signal such as a setting temperature set by an occupant and detection signals from sensors such as an outside air temperature and an inside air temperature provided at various locations in the vehicle, and this target blowing temperature. The opening of the air mix door is obtained according to the above.
[0005]
According to this calculation means, for example, at the time of heating operation such as in the initial stage of heating or when the outside air temperature is low, the target blowing temperature is generally obtained as a large numerical value so that the air volume ratio of the warm air passing through the heating means is increased. The temperature is adjusted to maximize the opening of the air mix door.
[0006]
[Problems to be solved by the invention]
However, in the conventional vehicle air conditioner, when the air heating amount of the heating means is small, that is, when the water temperature of the engine cooling water is low, the blowout temperature does not exceed the water temperature of the engine cooling water. In a vehicle with a large displacement, the engine coolant temperature may become very high.
[0007]
In this way, when the temperature of the engine cooling water increases, the temperature of the air blown out from the air outlet also increases, and if this water temperature exceeds a predetermined value, a problem that is too hot occurs, or if the water temperature is further increased, a problem due to high temperatures such as burns. There is a problem that occurs.
[0008]
Therefore, an object of the present invention has been made in view of the above points, and by providing a temperature control means that determines the upper limit of the blowing temperature, a comfortable temperature adjustment without problems due to the high blowing temperature is provided. The present invention provides a vehicular air conditioner that has been made possible.
[0009]
[Means for Solving the Problems]
  In order to achieve the above object, claims 1 toClaim 8The technical means described in is adopted. That is, in the first aspect of the present invention, the air conditioning duct (2) that guides the blown air toward the outlets that open to various places in the passenger compartment, and the air that flows through the air conditioning duct (2) using engine cooling water as a heat source are heated. Heating means (42), temperature adjusting means (15, 16) for adjusting the amount of air heating by the heating means (42), setting signals set by the occupant and detection from each sensor provided at various locations of the vehicle In the vehicle air conditioner including the temperature control means (10) for controlling the temperature adjustment means (15, 16) based on the signal, the temperature control means (10) defines a regulation value ( The temperature adjusting means (15, 16) is controlled so that the conditioned air blown out to the outlet has a blowing temperature equal to or lower than a regulation value (To).A vehicle air conditioner,
  Water temperature detection means (75) for detecting the temperature of the engine cooling water is provided,
  When the detected water temperature (Tw) from the water temperature detecting means (75) is in a region where the temperature control means (10) exceeds a predetermined value, the conditioned air blown to the outlet becomes a blowout temperature that is equal to or lower than the regulation value (To). To control the temperature adjusting means (15, 16)It is characterized by that.
[0010]
According to the first aspect of the present invention, the temperature control means (10) controls the blowout temperature to be equal to or lower than the regulation value (To), so that the blowout temperature is too high and too hot. The blowing temperature that does not occur can be blown out. Thereby, comfortable temperature control which does not generate the malfunction by high temperature can be performed.
[0012]
  AlsoIn a region where the detected water temperature (Tw) exceeds a predetermined value, by making the blowing temperature below the regulation value (To), the blowing that does not cause a malfunction such as the blowing temperature becoming too high and too hot Can blow out the temperature.
[0013]
  Claim 2In the invention described in (4), the air conditioning duct (2) that guides the blown air toward the outlets that open to various places in the passenger compartment, and the heating means (42) that heats the air flowing in the air conditioning duct (2) using engine cooling water as a heat source. ), Temperature adjusting means (15, 16) for adjusting the amount of air heating by the heating means (42), water temperature detecting means (75) for detecting the temperature of engine cooling water, setting signals set by the occupant and the vehicle In the vehicle air conditioner including the temperature control means (10) for controlling the temperature adjustment means (15, 16) based on the detection signals from the sensors provided at the various locations, the temperature control means (10) is The air-conditioning air blown out to the outlet when it is estimated that the outlet temperature exceeds a predetermined value, having a regulation value (To) that sets the upper limit of the outlet temperature so as to increase at the start of operation and decrease with time. Said Is characterized by controlling the braking value (To) following air temperature to become such that the temperature regulating means (15, 16).
[0014]
  Claim 2According to the invention described in (2), for example, a higher blowing temperature is required in the heating operation called “Max hot”. When it is estimated that such a blowing temperature exceeds a predetermined value, the blowing temperature is set to be lower than a regulation value (To) that defines an upper limit of the blowing temperature so as to increase at the start of operation and decrease with elapsed time. By controlling, it is possible to blow out the blowing temperature that does not cause a malfunction such as the blowing temperature becoming too high and too hot, and the air heating amount of the heating means (42) can be increased. Performance and heating performance can be improved. Thereby, comfortable temperature control which does not generate the malfunction by high temperature can be performed.
[0015]
  Claim 3In the invention described in 1, the hot air passage through which the hot air flows through the heating means (42) and the cold air bypass passage through which the cold air flows by bypassing the heating means (42) are formed in the air conditioning duct (2). The temperature adjusting means (15, 16) is composed of an air mix door (15, 16) for adjusting the air volume ratio between the air volume passing through the hot air passage and the air volume passing through the cold air bypass passage, and the temperature control means (10). Obtains the target blow temperature (TAO) based on the setting signal and the detection signal, and the air mix door (15, 16) increases as the target blow temperature (TAO) increases. , 16) calculating means (250) for obtaining the opening degree, and this calculating means (250) is used to detect air temperature when the detected water temperature (Tw) from the water temperature detecting means (75) exceeds a predetermined value. It is characterized by computing with regulatory values instead of opening a target air temperature of Kusudoa (15,16) (TAO) to (the To).
[0016]
  Claim 3In the calculation means (250) for obtaining the opening degree of the air mix door (15, 16), which is generally referred to as an air mix method, the regulation value (To) is used instead of the target outlet temperature (TAO). ), When the water temperature (Tw) of the engine cooling water becomes very high, the blowing temperature exceeding the regulation value (To) that defines the upper limit of the blowing temperature is not blown out, and the problem due to the high temperature Comfortable temperature control is possible without generating
[0017]
Further, by using the regulation value (To) instead of the target blowing temperature (TAO) for the conventional temperature control means (10), the software structure in the control process can be changed without increasing the number of parts. Can be easily handled.
[0018]
  Claim 4In the invention described in (1), the regulation value (To) is set such that it is set to a higher blowing temperature at the start of operation and decreases with the elapsed time.
[0019]
  Claim 4According to the invention described in (2), since the air heating amount of the heating means (42) can be increased by setting a higher blowing temperature at the start of operation, the warm-up performance when heating the passenger compartment is improved.
[0020]
  Claim 5The regulation value (To) is characterized in that it is set to a higher blowing temperature when the amount of conditioned air blown out to the outlet is large.
[0021]
  Claim 5According to the invention described in the above, since the air heating amount of the heating means (42) can be increased by setting the higher blowing temperature when the air volume is large, the stove ratio is increased and a feeling of heating is obtained. The warming-up performance and heating performance can be improved.
[0022]
  Claim 6The regulation value (To) is characterized in that the blowing temperature of the conditioned air blown out to the outlet is set according to the heat load in the passenger compartment.
[0023]
  Claim 6According to the invention described in the above, when the outside air temperature, the inside air temperature, etc. are low and the heat load is large, for example, if the air temperature is set high, the air heating amount of the heating means (42) can be increased, so that the warming up is achieved. Performance and heating performance can be improved.
[0024]
  Claim 7In the invention described in item 1, the restriction value (To) is set to a higher blowing temperature when the target blowing temperature (TAO) obtained from the setting signal and the detection signal is high.
[0025]
  Claim 7According to the invention described in the above,Claim 4Similarly, when the target blowing temperature (TAO) is high, the heat load is large, and therefore the air heating amount of the heating means (42) can be increased, so that warm-up performance and heating performance can be improved.
[0026]
  Claim 8In the invention described in (1), the detection signal is the outside air temperature, the inside air temperature, and the skin temperature, and the lower the temperature, the higher the regulation value (To) is set to a higher blowing temperature.
[0027]
  Claim 8Specifically, when the temperature is low, the higher blowing temperature is set, so that the same effect as that of the above-described claims can be obtained.
[0028]
In addition, the code | symbol in the bracket | parenthesis of each said means shows a corresponding relationship with the specific means of embodiment mentioned later.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
(First embodiment)
Hereinafter, the temperature adjustment and the outlet mode of the driver's seat (including the rear seat on the right side of the vehicle) side air conditioning zone and the passenger's seat (including the rear seat on the left side of the vehicle) side air conditioning zone and the outlet mode are controlled independently of each other. A first embodiment in which the present invention is applied to an automotive air conditioner will be described with reference to FIGS.
[0030]
2 is an overall configuration diagram showing the overall configuration of the air conditioning unit of the present embodiment, FIG. 3A is a front view showing an instrument panel of the vehicle, and FIGS. 3B and 3C are air conditioning switches. FIG. 4 is a front view showing an air conditioner operation panel.
[0031]
As shown in FIG. 2, the air conditioning unit 1 of the present embodiment is disposed in a lower part of a vehicle interior instrument panel of an automobile, and each air conditioning means (for example, an actuator or the like) is an air conditioning control device (hereinafter referred to as an ECU) 10. It is configured to be controlled by.
[0032]
The air conditioning unit 1 includes an air conditioning duct 2 disposed in front of the vehicle interior of the vehicle. An inside / outside air switching door 3 is provided on the air upstream side of the air conditioning duct 2. The inside / outside air switching door 3 is an inside / outside air switching unit that is driven by an actuator such as a servo motor as a driving unit to change the opening degree between the inside air inlet 6 and the outside air inlet 7 (so-called inside / outside air mode).
[0033]
The air outlet 4 of the inside / outside air switching door 3 is provided with a blower 4 as a blower, and this blower 4 is rotationally driven by a blower motor 9 which is a blower drive means driven by a blower motor drive circuit 8 for air conditioning. It is a centrifugal blower that generates an air flow toward the vehicle interior in the duct 2.
[0034]
Note that the blower 4 changes the blown air velocity or the blown air velocity of the air-conditioning air blown from the air outlets on the driver seat side and the passenger seat side, which will be described later, toward the driver seat side and the passenger seat side air conditioning zone. A blowing air volume varying means or a blowing air speed varying means is configured.
[0035]
Next, an evaporator 41, which is a cooling means for cooling the air passing through the air conditioning duct 2 by exchanging heat with the refrigerant, is disposed at the center of the air conditioning duct 2. In addition, a heater core 42 as a heating means for heating the air passing through the first and second air passages 11 and 12 by exchanging heat with the engine cooling water is disposed on the air downstream side of the evaporator 41. Yes. The first and second air passages 11 and 12 are partitioned by a partition plate 14.
[0036]
In addition, on the air upstream side of the heater core 42, first and second air mix doors 15, which are temperature adjusting means for independently adjusting the temperature of the driver's seat air conditioning zone and the passenger seat air conditioning zone in the passenger compartment, These air mix doors 15 and 16 are driven by actuators such as first and second servo motors 17 and 18 as driving means, and are provided on the driver seat side and the passenger seat side described later. A driver-side and passenger-side outlet temperature adjusting means for changing the outlet temperature of the conditioned air blown out from each outlet toward the driver-seat side and passenger-side air-conditioning zone in the passenger compartment is configured.
[0037]
The first and second air mix doors 15 and 16 serving as the temperature adjusting means pass through the heater core 42 and a hot air passage through which the hot air flows, and the heater core 42 bypasses (also referred to as a bypass) and cool air flows. The cold air bypass passage is formed on the downstream side of the heater core 42, and is a door for adjusting the temperature of the air-conditioning air blowing temperature by adjusting the mixing ratio of the amount of air flowing through each passage.
[0038]
The evaporator 41 is a heat exchanger that constitutes a well-known refrigeration cycle piped together with a compressor, a condenser, a liquid receiver, and a decompressor (not shown), and dehumidifies and cools the air in the air conditioning duct 2. The compressor is belt-driven to an output shaft of an automobile engine and connected via an electromagnetic clutch (not shown), and is controlled by the ECU 10 to intermittently rotate the engine.
[0039]
When the electromagnetic clutch (not shown) is turned on and the compressor is started, the air-conditioning wind blown into the passenger compartment is cooled by the evaporator 41 cooling and dehumidifying the air passing through the air-conditioning duct 2. Is done. The heater core 42 is a heat exchanger that uses the cooling water of the automobile engine as a heat source, and reheats the cold air cooled by the evaporator 41.
[0040]
Next, as shown in FIGS. 2 and 3, at the air downstream end of each blowing duct communicating with the air downstream side of the first air passage 11, a driver's seat side defroster blow for blowing conditioned air to the inner surface of the windshield is performed. Exit 20, driver's side center face outlet 21 and driver's side face outlet 22 for blowing conditioned air to the upper body of the driver's seat, driver's side foot blow for blowing conditioned air to the driver's seat The outlet 23 is open.
[0041]
Further, at the air downstream end of each blowing duct communicating with the air downstream side of the second air passage 12, the passenger seat side defroster outlet 30 for blowing the air conditioned air to the inner surface of the windshield, the conditioned air on the upper body of the passenger seat occupant Passenger seat side center face outlet 31 and passenger seat side face outlet 32, and passenger seat side foot outlet 23 for blowing air-conditioned air to the feet of the passenger in the passenger seat are opened.
[0042]
In addition, at the air downstream end of the second air passage 12, a passenger seat side center face air outlet 31 and a passenger seat side face air outlet 32 for blowing air-conditioned air to the upper body of the passenger seat passenger, and at the feet of the passenger seat passenger A passenger seat side foot outlet 33 for blowing out conditioned air is opened.
[0043]
And in the 1st, 2nd air passages 11 and 12, the driver's seat side and the passenger's seat side outlet for performing the setting of the outlet mode of the driver's seat side and passenger's seat side in a vehicle interior mutually independently Switching doors 24 to 26 and 34 to 36 are provided. The driver seat side and passenger seat side air outlet switching doors 24 to 26 and 34 to 36 are driven by actuators such as servo motors 28, 29, 38, and 39, which are driving means, and the driver seat side and the passenger seat. It is the mode switching door which switches each side blower outlet mode.
[0044]
Here, as the air outlet mode on the driver's seat side and the passenger seat side, there are a FACE mode, a B / L mode, a FOOT mode, an F / D mode, a DEF mode, and the like.
[0045]
The blower motor drive circuit 8 and the actuators such as the servo motors 5, 17, 18, 28, 29, 38, 39 are controlled based on a control signal from the ECU 10.
[0046]
The ECU 10 corresponds to the temperature control means of the present invention. When an ignition switch for starting and stopping the engine is turned on (IG / ON), a battery (not shown) that is an in-vehicle power source mounted on the vehicle. When the DC power source is supplied from (), arithmetic processing and control processing are started.
[0047]
Further, as shown in FIGS. 2 and 4, the ECU 10 is configured such that each operation signal is input from various operation switches on an operation panel 51 that is integrally installed on the instrument panel 50.
[0048]
The operation panel 51 includes a liquid crystal display 52, an inside / outside air changeover switch 53, a front defroster switch 54, a rear defroster (defogger) switch 55, a dual (dual) switch 56, an outlet mode (MODE) changeover switch 57, and a blower. Air volume switch 58, A / C (air conditioner) switch 59, AUTO (auto) switch 60, OFF switch 61, driver side (DRIVER) temperature setting switch 62, passenger side (PASSENGER) temperature setting switch 63 and ECON (economy) ) A switch 64 is installed.
[0049]
Of the above switches, the dual switch 56 controls the left and right independent temperature control for performing the temperature adjustment in the driver side air conditioning zone and the temperature adjustment in the passenger side air conditioning zone independently of each other. Independent control command means. Further, the air outlet mode (MODE) changeover switch 57 sets the air outlet mode (MODE) to any one of the FACE mode, the B / L mode, the FOOT mode, the F / D mode, and the DEF mode according to the user's manual operation. It is an air outlet mode setting means for switching the air outlet mode.
[0050]
The inside / outside air changeover switch 53 is a switch for the occupant to manually set either the outside air mode for designating outside air introduction or the inside air mode for designating inside air circulation. The blower air volume changeover switch 58 is a switch that changes the air volume level of the blower 4 in stages. In this embodiment, the blower air volume changeover switch 58 has three levels of Hi level (maximum air volume), Me (intermediate air volume) level, and Lo (minimum air volume) level. Can be set.
[0051]
The liquid crystal display 52 displays a set temperature display unit for visually displaying the set temperatures of the driver side and passenger side air conditioning zones, an air outlet mode display unit for visually displaying the air outlet mode, and a visual display of the blower air volume. An air volume display unit is provided. The liquid crystal display 52 may be provided with an outside air temperature display unit, an inside / outside air mode display unit, and a time display unit. Various switches on the operation panel 51 may be provided on the liquid crystal display 52.
[0052]
As shown in FIG. 4, the A / C (air conditioner) switch 59 is a switch for instructing to start or stop the compressor (not shown) of the refrigeration cycle, and generally turns off the compressor (not shown). It is provided to improve the fuel efficiency of the engine by reducing the rotational power of the engine.
[0053]
The A / C (air conditioner) switch 59 is turned on when pressed once, the visual display (LED) 59a is turned on (see FIG. 3B), turned off when pressed next time, and the LED 59a is turned off. (Refer to FIG. 3 (c)). Further, the LED 59a is turned off even if the blower air volume switch 58 is set to the OFF position or the 0FF switch 61 is pressed. That is, when the light is turned off, the compressor (not shown) of the refrigeration cycle is stopped.
[0054]
The driver seat side (DRIVER) temperature setting switch 62 is a driver seat side temperature setting means for setting the temperature in the driver seat side air conditioning zone to a desired temperature, and includes an up switch 62a and a down switch 62b. Similarly, the passenger seat side (PASSENGER) temperature setting switch 63 is a passenger seat side temperature setting means for setting the temperature in the passenger seat side air conditioning zone to a desired temperature, and is based on the up switch 63a and the down switch 63b. Become.
[0055]
Moreover, the AUTO (automatic) switch 60 is a switch for issuing a command for automatically controlling each air conditioner constituting the air conditioner, and the OFF switch 61 is a switch for outputting a stop command for the air conditioner. Further, the ECON (economy) switch 64 is a switch for instructing whether or not to perform a compressor (not shown) of the refrigeration cycle and to perform economical air-conditioning control in consideration of low fuel consumption and power saving by reducing the operation rate. .
[0056]
Further, the ECU 10 includes functions such as a central processing unit (CPU), a memory (ROM or EEOROM, RAM), and an I / O port (input / output circuit) for performing arithmetic processing and control processing. A well-known microcomputer is provided, and detection signals from various sensors are A / D converted by an I / O port or an A / D conversion circuit and then input to the microcomputer.
[0057]
That is, the ECU 10 includes an inside air temperature sensor 71 as an inside air temperature detecting means for detecting a vehicle interior temperature (inside air temperature), an outside air temperature sensor 72 as an outside air temperature detecting means for detecting a vehicle outside temperature (outside air temperature), and solar radiation. A solar radiation sensor 73 is connected as detection means.
[0058]
Also, a post-evaporation temperature sensor 74 as post-evaporation detection means for detecting the air temperature immediately after passing through the evaporator 41 (hereinafter referred to as post-evaporation temperature), and a water temperature detection means for detecting the coolant temperature of the vehicle engine. As a cooling water temperature sensor 75, a humidity sensor 76 as a humidity detecting means for detecting the relative humidity in the passenger compartment, a refrigerant pressure sensor 77 for detecting the high-pressure side pressure of the refrigeration cycle, and a vehicle traveling speed (vehicle speed: SPD). A vehicle speed sensor (not shown) as vehicle speed detecting means is connected.
[0059]
Here, the humidity sensor 76 is housed in a recess formed in the front surface of the instrument panel 50 in the vicinity of the driver's seat together with the inside air temperature sensor 71. The recess is closed by a lid 50a having a vent hole. Among these sensors, for the inside air temperature sensor 71, the outside air temperature sensor 72, the after-evaporation temperature sensor 74, and the cooling water temperature sensor 75, for example, temperature sensitive elements such as a thermistor are used.
[0060]
Further, the solar radiation sensor 73 is a driver-seat-side solar radiation intensity detecting means (for example, a photodiode) that detects a solar radiation amount (solar radiation intensity) Ts (Dr) irradiated in the driver-seat-side air conditioning zone, and a passenger seat-side air conditioning zone. It has a passenger side solar radiation intensity detecting means (for example, a photodiode) for detecting the amount of solar radiation (solar radiation intensity) Ts (Pa) irradiated inside. The refrigerant pressure sensor 77 is provided between a liquid receiver and a decompressor on the high pressure side of a refrigeration cycle (not shown).
[0061]
Next, the operation of the present embodiment will be described with reference to the flowcharts of FIGS. 1 and 5 based on the control processing including the temperature control means of the ECU 10 when the AUTO switch 60 is turned on, that is, at the time of auto control. To do.
[0062]
First, when the ignition switch is turned on and power is supplied to the ECU 10, execution of the control program (main routine) stored in advance in R0M shown in FIG. 5 is started. In step 200, the contents of the data processing memory (RAM) built in the CPU in the ECU 10 are initialized.
[0063]
In the next step 210, various data are read into the data processing memory (RAM). That is, operation signals from various operation switches on the operation panel 51 and detection signals from the sensors are input.
[0064]
In particular, the inside air temperature Tr detected by the inside air temperature sensor 71, the outside air temperature Tam detected by the outside air temperature sensor 72, the solar radiation amount Ts (Dr) detected by the solar radiation sensor 73, Ts (Pa), and the post-evaporation temperature sensor 74 detected. Environmental conditions such as the post-evaporation temperature Te and the water temperature Tw detected by the cooling water temperature sensor 75 are input, and the operation signal from the operation panel 51 is set by the driver seat side temperature setting switch 62 and the passenger seat side temperature setting switch 63. The states of the operation switches of the target temperature Tset (Dr) and the target temperature Tset (Pa) that have been set are input.
[0065]
Then, in the next step 220 which is the target blowing temperature calculation means, Tset (Dr), Tset (Pa), Tr, Tam, Substituting Ts (Dr) and Ts (Pa), the target blowing temperature TAO (Dr) of the conditioned air blown to the driver's seat side and the target blowing temperature TAO (Pa) of the conditioned air blown to the passenger seat side are calculated. To do.
[0066]
[Formula 1]
TAO (Dr) = Kset × Tset (Dr) −Kr × Tr−Kam × Tam−Ks × Ts (Dr) + Kd (Dr) × (Cd (Dr) + Ka (Dr) (10−Tam)) × (Tset ( Dr) -Tset (Pa)) + C
[Formula 2]
TAO (Pa) = Kset × Tset (Pa) −Kr × Tr−Kam × Tam−Ks × Ts (Pa) + Kd (Pa) × (Cd (Pa) + Ka (Pa) (10−Tam)) × (Tset ( Pa) −Tset (Dr)) + C
Here, Kset, Kr, Kam, Ks, Kd (Dr), and Kd (Pa) are respectively the temperature setting gain, the vehicle interior temperature gain, the outside air temperature gain, the solar radiation gain, and the driver side and passenger side air conditioning zones. Represents temperature difference correction gain.
[0067]
Ka (Dr) and Ka (Pa) represent gains for correcting the degree of influence of the outside air temperature Tam on the air conditioning temperatures of the driver side air conditioning zone and the passenger side air conditioning zone, respectively. Cd (Dr), Cd (Pa) is a constant corresponding to the degree of influence, and C is a correction constant. Here, values such as Ka (Dr), Ka (Pa), Cd (Dr), and Cd (Pa) vary depending on various parameters such as the size of the vehicle and the blowing direction of the air conditioning unit 1.
[0068]
In the next step 230, the blower air volume (the blower control voltage VA (applied to the blower motor 9) is calculated based on the target blowing temperature TAO (Dr) and TAO (Pa) on the driver seat side and the passenger seat side obtained in step 220. Dr), VA (Dr)) is calculated. Specifically, the blower control voltage VA is set to blower control voltages VA (Dr) and VA (Dr) respectively adapted to the target blowing temperatures TAO (Dr) and TAO (Pa) on the driver side and passenger side. The blower control voltages VA (Dr) and VA (Dr) are calculated based on the air blowing characteristics stored in advance in the ROM shown in FIG. 6, and the averaging process (VA = (VA (Dr) + VA (Pa)) / 2) It is calculated by doing.
[0069]
In the next step 240, based on the target air temperature TAO (Dr), TAO (Pa) on the driver seat side and the passenger seat side obtained in step 220, and the air outlet mode characteristics shown in FIG. The air outlet zones of the driver's seat and the passenger's seat are determined.
[0070]
Specifically, the target blowout temperatures TAO (Dr) and TAO (Pa) are set so that the FACE mode, the B / L mode, and the FOOT mode are set from a low temperature to a high temperature. Further, by operating the air outlet mode changeover switch 59 provided on the operation panel 51, the air outlet mode is fixed to any one of the FACE mode, the B / L mode, the FOOT mode, and the F / D mode.
[0071]
The FACE mode is a blow-out mode in which air-conditioned air is blown toward the upper body of the passenger in the air-conditioning zone on the driver's seat side and the passenger seat side. The B / L mode is a blow-out mode in which air-conditioned air is blown toward the upper body and feet of the passengers in the air-conditioning zone on the driver's seat side and the passenger seat side. The FOOT mode is a blowing mode in which the conditioned air is blown toward the feet of the passengers in the air conditioning zone on the driver's seat side and the passenger seat side. Further, the F / D mode is a blowing mode in which air-conditioned air is blown toward the passenger's feet and the inner surface of the front window of the vehicle. When a front defroster switch 54 provided on the operation panel 51 is operated, a DEF mode in which conditioned air is blown toward the inner surface of the front window of the vehicle is set.
[0072]
Next, calculation of the target opening degree SW (Dr) and SW (Pa) of the first and second air mix doors 15 and 16 which are temperature adjusting means as the main part of the present invention will be described based on FIG. Here, the target opening degree SW (Dr) and SW (Pa) are obtained in accordance with the water temperature Tw flowing through the heater core 42 detected from the water temperature sensor 96, and this is detected in an arithmetic expression for obtaining the target opening degree SW. In a region where the water temperature Tw exceeds a predetermined value set in advance, the target opening degree SW is obtained by using a regulation value To that sets an upper limit of the blowing temperature rather than calculating based on the target blowing temperature TAO described above. It is.
[0073]
As shown in FIG. 1, first, in step 251, it is determined whether or not the water temperature Tw exceeds a predetermined value (for example, 68 ° C.). When the water temperature Tw is lower than a predetermined value (for example, 68 ° C. or lower) such as when the engine stopped for a long time is started, the routine proceeds to step 252 and the target opening degree SW (Dr), SW (Pa). Ask for.
[0074]
Here, the first air mix is obtained by substituting the Tw and Te read in step 210 and the target outlet temperatures TAO (Dr) and TAO (Pa) into the following formulas 3 and 4 stored in advance in the ROM. The target opening degree SW (Dr) of the door 15 and the target opening degree SW (Pa) of the second air mix door 16 are calculated.
[0075]
[Formula 3]
SW (Dr) = {(TAO (Dr) −Te) / (Tw−Te)} × 100 (%)
[Formula 4]
SW (Pa) = {(TAO (Pa) −Te) / (Tw−Te)} × 100 (%)
In this calculation formula, for example, when the inside air temperature Tr and the outside air temperature Tam are low, the target opening temperature SW is also increased by increasing the target blowing temperature TAO. However, the maximum opening SW is 100%, and the air passing through the evaporator 41 is allowed to pass through the heater core 42 to receive the maximum amount of air heating from the heater core 42.
[0076]
Next, when the water temperature Tw exceeds a predetermined value (for example, 68 ° C. or lower), in step 253, here, the target temperature Tset (Dr) and the target temperature Tset (Pa) set by the occupant read in step 210 are set. It is determined whether or not the region is in the maximum Hi range, and two types of restriction values To that determine the upper limit of the blowing temperature are selected according to the target set temperature Tset. In this embodiment, if the target set temperature Tset is in the Hi region, 85 ° C. is selected as the higher restriction value To in step 254, and if it is below the Hi region, in step 255, the lower restriction value To is 68 ° C. To choose.
[0077]
Accordingly, the process proceeds to the next step 256, and the target opening degree SW (Dr), SW (Pa) is obtained using either the higher restriction value To or the lower restriction value To. Specifically, in [Equation 3] and [Equation 4] in step 252, either a higher regulation value To or a lower regulation value To instead of the target blowing temperature TAO (Dr), TAO (Pa). Is substituted for the target opening degree SW (Dr), SW (Pa).
[0078]
Accordingly, by substituting Tw, Te and the regulation value To into the following formulas 5 and 6 stored in advance in the ROM, the target opening degree SW (Dr) of the first air mix door 15 and the second air mix door 16 target opening degree SW (Pa) is calculated.
[0079]
[Formula 5]
SW (Dr) = {(To−Te) / (Tw−Te)} × 100 (%)
[Formula 6]
SW (Pa) = {(To−Te) / (Tw−Te)} × 100 (%)
Here, either 68 degrees or 85 degrees is selected as the regulation value To and substituted into the mathematical expressions 5 and 6. Thereby, when the water temperature Tw exceeds the predetermined value, the target opening degree SW is obtained from the regulation value To, and the temperature can be adjusted by the lower blowing temperature than that obtained from the target blowing temperature TAO in step 252.
[0080]
In the next step 260, based on the target air temperature TAO (Dr) and TAO (Pa) on the driver seat side and the passenger seat side obtained in step 220, and the inside / outside air mode characteristics stored in the ROM in advance. Determine the introduction rate of inside and outside air. According to the inside / outside air mode characteristics, the inside air mode is selected during the cooling operation (that is, when the TAO value is low).
[0081]
Then, in the next step 270, the control amount of the blower control voltage VA calculated in step 230 is output to the blower motor drive circuit 8. As a result, the blower 4 fixed to the blower motor 9 is rotated to control the amount of air blown out into the passenger compartment.
[0082]
Then, in the next step 280, a control signal is output to the servo motors 28, 29, 38, 39 based on the control amount for the air outlet mode determined in step 240.
[0083]
Then, in the next step 290, the control amounts to be the target opening degree SW (Dr) of the first air mix door 15 and the target opening degree SW (Pa) of the second air mix door 16 calculated in step 250 above. Based on this, a control signal is output to the servo motors 17 and 18.
[0084]
In the next step 300, a control signal is output to the servo motor 5 based on the control amount that is the inside / outside air introduction ratio determined in step 260.
[0085]
After the process of step 300, the process returns to step 210 and reads various input signals again. Thereby, among the control processes after step 220, in particular, depending on the water temperature Tw, the target outlet temperature TAO (Dr), TAO (Pa), The target opening degree SW (Dr) and SW (Pa) are calculated, and the temperature control and air conditioning control in which the driver's seat side air conditioning zone and the passenger seat side air conditioning zone are independent from each other are repeated.
[0086]
According to the automobile air conditioner of the first embodiment described above, an arithmetic expression (Formula 2) for obtaining the target opening degree SW of the first and second air mix doors 15 and 16 as temperature adjusting means based on the target outlet temperature TAO. In Formula 3), when the engine coolant temperature Tw is low, such as when the engine is started, there is no problem because the blowout temperature does not exceed the engine coolant temperature Tw. In some cases, the engine cooling water temperature Tw becomes very high.
[0087]
At this time, in the above equation, the higher the target blowout temperature TAO, the higher the blowout temperature corresponding to the water temperature Tw, so that there is a problem that it is too hot, and if the water temperature is further raised, there is a problem that a trouble due to high temperatures such as burns occurs. is there.
[0088]
Therefore, in the present invention, when the water temperature Tw detected from the cooling water temperature sensor 75 is in a region exceeding a predetermined value, the opening degree of the first and second air mix doors 15 and 16 is changed to the target outlet temperature TAO, By calculating using the regulation value To that defines the upper limit of the blowing temperature, even when the engine cooling water temperature Tw becomes very high, the blowing temperature exceeding the regulation value To is not blown out, and it depends on the high temperature. Comfortable temperature control can be performed without causing problems.
[0089]
Moreover, since the air heating amount of the heater core 42 can be increased by setting the restriction value To to a high restriction value To when the air volume is large, the warm-up performance and the heating performance at the start of the heating operation and the like are improved. Can be planned.
[0090]
Further, by using the regulation value (To) instead of the target blowing temperature (TAO) for the conventional temperature control means (10), the software structure in the control process can be changed without increasing the number of parts. Can be easily handled.
[0091]
(Second Embodiment)
In the above embodiment, when the detected water temperature Tw from the cooling water temperature sensor 75 which is the water temperature detecting means is in a region exceeding the predetermined value, the target opening degree SW (Dr of the first and second air mix doors 15 and 16 is selected. ), SW (Pa), in order to obtain the SW (Pa), instead of the target outlet temperatures TAO (Dr) and TAO (Pa) in the arithmetic expressions of [Equation 3] and [Equation 4] in step 252 in the control process of the ECU 10. In the above, the temperature control of the blowing temperature that does not exceed the regulation value To by substituting either the higher regulation value To or the lower regulation value To has been described, but not limited to this, the water temperature Tw, You may obtain | require from the characteristic view which calculated | required regulation value To according to the elapsed time of water temperature Tw.
[0092]
Specifically, as shown in the flowchart of FIG. 8, in this embodiment, in the present embodiment, if the target set temperature Tset is in the Hi region, a higher restriction value To is obtained in Step 254 as shown in FIG. As shown, when the water temperature Tw exceeds 95 ° C., for example, the regulation value To is sequentially selected according to the elapsed time when the water temperature Tw is exceeded, and the target opening degree SW is obtained in step 256.
[0093]
Further, when the temperature is below the Hi range, as a lower regulation value To in step 255, as shown in FIG. 9B, for example, when the water temperature Tw exceeds 85 ° C., the passage of time when the water temperature Tw is exceeded. In step 256, the target opening degree SW is obtained by sequentially selecting the regulation value To according to the time.
[0094]
When the water temperature Tw is lower than the above 95 ° C. or 85 ° C., either 85 ° C. or 68 ° C. may be selected as the lower regulation value To as the constant regulation value To in the first embodiment.
[0095]
According to the above embodiment, since the upper limit of the blowing temperature can be made higher than in the first embodiment, it is possible to improve the warm-up performance and the heating performance such as at the start of the heating operation. Further, by lowering the regulation value To with the elapsed time, the blowing temperature exceeding the regulation value To is not blown out, and comfortable temperature control without causing a malfunction due to high temperature can be performed.
[0096]
(Third embodiment)
In the above embodiment, the regulation value To for obtaining the target opening degree SW (Dr), SW (Pa) of the first and second air mix doors 15 and 16 is a constant value or the water temperature Tw or the passage of the water temperature Tw. Although explanation was made using a higher regulation value To and a lower regulation value To according to the time, a higher regulation value To and a lower regulation value according to the target blowout temperature TAO and the thermal load of the vehicle detected by each sensor To may be set.
[0097]
For example, as shown in FIG. 10A and FIG. 10B, the restriction value To may be set according to the inside air temperature Tr detected from the inside air temperature sensor 71. In other words, both the higher restriction value To and the lower restriction value To may be set such that the restriction value To is increased when the inside air temperature Tr is low and the restriction value To is sequentially lowered as the inside air temperature Tr increases. .
[0098]
According to the above embodiment, when the target blowing temperature TAO and the thermal load of the vehicle are large, the upper limit of the blowing temperature can be increased by increasing the regulation value To. Up performance and heating performance can be improved.
[0099]
Similarly to the inside air temperature Tr, as shown in FIG. 11A and FIG. 11B, the regulation value To may be set according to the outside air temperature Tam detected from the outside air temperature sensor 72. That is, both the higher restriction value To and the lower restriction value To may be set such that the restriction value To is increased when the outside air temperature Tam is low and the restriction value To is sequentially lowered as the outside air temperature Tam increases. . Thereby, there exists an effect similar to the above.
[0100]
(Fourth embodiment)
In the above embodiment, when the detected water temperature Tw from the cooling water temperature sensor 75 which is the water temperature detecting means is in a region exceeding a predetermined value (for example, 68 ° C.), the regulation value To which defines the upper limit of the blowing temperature is provided. Although the first and second air mix doors 15 and 16 have been described so that the conditioned air blown to the outlet has a blowing temperature equal to or lower than the regulation value (To), it is increased to a heating operation called Max Hot, for example. The present invention can be applied even when the blow-off temperature is required.
[0101]
At this time, as described in the second embodiment, the restriction value To is obtained from the characteristic diagram (see FIGS. 9A and 9B) in which the restriction value To is obtained according to the water temperature Tw and the elapsed time of the water temperature Tw. May be. In addition, the flowchart of the control process of the air-conditioning control apparatus 10 at this time is shown in FIG. 12, About the same control process as 1st and 2nd embodiment, the same code | symbol is attached | subjected and description is abbreviate | omitted.
[0102]
According to the above embodiment, by controlling the blowout temperature to be equal to or lower than the regulation value To set the upper limit of the blowout temperature so as to increase at the start of operation and decrease with elapsed time, the blowout temperature becomes high. It is possible to blow out a blow temperature that does not cause problems such as being too hot and too hot, and the air heating amount of the heater core 42 can be increased, so that the warm-up performance and the heating performance of the heating operation can be improved.
[0103]
(Other embodiments)
In the above embodiment, when the detected water temperature Tw detected by the cooling water temperature sensor 75 is in a region exceeding the predetermined value, the control is performed so that the blowout temperature is equal to or less than the regulation value To that defines the upper limit of the blowout temperature. Not only this but you may make it regulate regardless of detection water temperature Tw.
[0104]
Further, the restriction value To of the blowing temperature described above can be determined by the magnitude of the air volume. That is, if the stove ratio, which is the ratio of the air heating amount and the air volume, is small, a feeling of heating cannot be obtained. Therefore, when the air volume is large, the regulation value To may be increased to increase the blowing temperature.
[0105]
Specifically, as shown in FIGS. 13 (a) and 13 (b), the blower level sequentially increases and the regulation value To also increases according to the magnitude of the blower level set based on the blower control voltage VA. Increase. Thereby, since the air heating amount of the heater core 42 can be increased, the comfort of heating operation can be achieved.
[0106]
Further, a detection sensor for detecting the skin temperature of the occupant may be provided, and a higher restriction value To and a lower restriction value To may be set according to the skin temperature. For example, the skin temperature at the foot of an occupant is detected, and as shown in FIGS. 14 (a) and 14 (b), both the higher restriction value To and the lower restriction value To are set to the restriction value To when the skin temperature is low. It is good to set it so that the regulation value To decreases as the skin temperature increases in sequence. As a result, when the foot is cold, such as at the start of the heating operation, higher blown air is blown to improve the warm-up performance and the heating performance.
[0107]
In the above embodiment, the present invention is applied to the air conditioning unit 1 that controls the temperature adjustment of the air conditioning zone on the driver's seat side and the air conditioning zone on the passenger seat side independently of each other. One air conditioning zone may be a front seat side space in the vehicle interior, and the second air conditioning zone may be a rear seat side space. Of course, the present invention can also be applied to an air conditioner that performs conventionally well-known single control without the partition plate 14 between the air conditioning zone on the driver's seat side and the air conditioning zone on the passenger seat side.
[0108]
Moreover, in the above embodiment, in the arithmetic expression for calculating the target opening degree SW of [Equation 3] and [Equation 4], instead of the target blowing temperature TAO (Dr) and TAO (Pa) that are numerators, it is increased. Although the temperature control of the blowing temperature that does not exceed the regulation value To by substituting either the regulation value To or the lower regulation value To has been described, the present invention is not limited to this, and the detected water temperature Tw from the cooling water temperature sensor is a predetermined value. The upper limit of the amount of air heating may be regulated by adjusting the hot water flow rate of the heater core 42, which is the denominator of the above arithmetic expression.
[0109]
In the above embodiment, the so-called air mix type temperature adjustment for controlling the servo motors 17 and 18 by obtaining the target opening SW of the first and second air mix doors 15 and 16 as temperature adjusting means is described. However, the present invention is not limited to this, and in an automotive air conditioner having a reheat-type temperature adjustment in which the cool air from the evaporator 41 is reheated by the heater core 42, for example, the flow rate of hot water in the heater core 42 is adjusted to adjust the amount of air heating. By applying the present invention so as to restrict the upper limit, the upper limit of the blowing temperature can be restricted.
[0110]
Similarly, it goes without saying that the present invention can also be applied to an automotive heating apparatus in which only the heater core 42 is accommodated in the air conditioning duct 2.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a control process for obtaining a target opening degree SW of first and second air mix doors 15 and 16 in a first embodiment of the present invention.
FIG. 2 is a configuration diagram showing the overall configuration of the automotive air conditioner in the first embodiment of the present invention.
3A is a front view showing an instrument panel 50 of the vehicle, and FIGS. 3B and 3C are front views showing an air conditioner (A / C) switch 59. FIG.
FIG. 4 is a front view showing various operation switches of the operation panel 51 in the first embodiment.
FIG. 5 is a flowchart showing a control process of the ECU 10 in the first embodiment.
FIG. 6 is a characteristic diagram showing a relationship between a target blowing temperature TAO and a blower control voltage VA in the first embodiment.
FIG. 7 is a characteristic diagram showing a relationship between a target outlet temperature TAO and an outlet mode in the first embodiment.
FIG. 8 is a flowchart showing a control process for obtaining a target opening degree SW of the first and second air mix doors 15 and 16 in the second embodiment of the present invention.
FIG. 9A is a characteristic diagram showing the relationship between a higher regulation value To when the water temperature Tw> 95 and the elapsed time, and FIG. 9B is a lower regulation when the water temperature Tw> 85. It is a characteristic view which shows the relationship between value To and elapsed time.
FIG. 10A is a characteristic diagram showing a relationship between a higher regulation value To and the inside air temperature Tr in the third embodiment of the present invention, and FIG. FIG.
11A is a characteristic diagram showing a relationship between a higher regulation value To and an outside air temperature Tam, and FIG. 11B is a characteristic diagram showing a relation between a lower regulation value To and the outside air temperature Tam. It is.
FIG. 12 is a flowchart showing a control process for obtaining a target opening degree SW of the first and second air mix doors 15 and 16 in the fourth embodiment of the present invention.
13A is a characteristic diagram showing a relationship between a higher regulation value To and a blower level, and FIG. 13B is a characteristic diagram showing a relation between a lower regulation value To and a blower level. .
14A is a characteristic diagram showing a relationship between a higher regulation value To and the skin temperature, and FIG. 14B is a characteristic diagram showing a relation between a lower regulation value To and the skin temperature. .
[Explanation of symbols]
2. Air conditioning duct
10. Air conditioning control device, ECU (temperature control means)
15 ... 1st air mix door (air mix door, temperature control means)
16 ... Second air mix door (air mix door, temperature control means)
42 ... Heater core (heating means)
75 ... Cooling water temperature sensor (water temperature detection means)
250 ... Calculation means
TAO ... Target blowing temperature
To ... Regulated value
Tw ... Water temperature (detected water temperature)

Claims (8)

An air-conditioning duct (2) for guiding the blast air toward the air outlets opening at various locations in the passenger compartment;
Heating means (42) for heating air flowing in the air conditioning duct (2) using engine cooling water as a heat source;
Temperature adjusting means (15, 16) for adjusting the amount of air heating by the heating means (42);
A vehicle air conditioner comprising temperature control means (10) for controlling the temperature adjusting means (15, 16) based on a setting signal set by an occupant and detection signals from sensors provided at various locations of the vehicle. In
The temperature control means (10) has a regulation value (To) that defines an upper limit of the blowout temperature, and the temperature adjustment is performed so that the conditioned air blown out to the outlet has a blowout temperature that is equal to or less than the regulation value (To). A vehicle air conditioner for controlling the means (15, 16) ,
Water temperature detecting means (75) for detecting the temperature of the engine cooling water is provided;
The temperature control means (10) blows out the conditioned air blown out to the outlet when the detected water temperature (Tw) from the water temperature detection means (75) exceeds a predetermined value. The vehicle air conditioner characterized in that the temperature adjusting means (15, 16) is controlled so as to have a temperature . An air-conditioning duct (2) for guiding the blast air toward the air outlets opening at various locations in the passenger compartment;
Heating means (42) for heating air flowing in the air conditioning duct (2) using engine cooling water as a heat source;
Temperature adjusting means (15, 16) for adjusting the amount of air heating by the heating means (42);
Water temperature detecting means (75) for detecting the temperature of the engine cooling water;
A vehicle air conditioner comprising temperature control means (10) for controlling the temperature adjusting means (15, 16) based on a setting signal set by an occupant and detection signals from sensors provided at various locations of the vehicle. In
The temperature control means (10) has a regulation value (To) that defines an upper limit of the blowing temperature so as to increase at the start of operation and decrease with elapsed time, and it is estimated that the blowing temperature exceeds a predetermined value. The vehicle air conditioner is characterized in that the temperature adjusting means (15, 16) is controlled so that the conditioned air blown out to the outlet is at a blowing temperature equal to or lower than the regulation value (To). A hot air passage through which the hot air flows through the heating means (42) and a cold air bypass passage through which the cold air flows by bypassing the heating means (42) are formed in the air conditioning duct (2), and the temperature The adjusting means (15, 16) is constituted by an air mix door (15, 16) for adjusting the air volume ratio between the air volume passing through the hot air passage and the air volume passing through the cold air bypass passage,
The temperature control means (10) obtains a target blowing temperature (TAO) based on the setting signal and the detection signal, and the opening degree of the air mix door (15, 16) increases as the target blowing temperature (TAO) increases. Has a calculating means (250) for obtaining the opening of the air mix door (15, 16) so that the detected water temperature (Tw) from the water temperature detecting means (75) is obtained. claims but characterized by calculation using the at region beyond a predetermined value, the regulating value instead an opening degree of the air mix door (15, 16) to the target air temperature (TAO) (the to) The vehicle air conditioner according to claim 1 or 2 . 4. The vehicle air conditioner according to claim 1, wherein the restriction value (To) is set to a higher blowing temperature at the start of operation and to decrease with an elapsed time . 5. 5. The vehicle according to claim 1, wherein the regulation value (To) is set to a higher blowing temperature when the amount of conditioned air blown out to the outlet is large . Air conditioner. The vehicle according to any one of claims 1 to 5, wherein the regulation value (To) is set according to a heat load in a passenger compartment of a conditioned air blown out to the outlet. Air conditioner. The air conditioning system for vehicles according to claim 6 , wherein the regulation value (To) is set to a higher air temperature when the target air temperature (TAO) obtained from the setting signal and the detection signal is high. apparatus. 8. The vehicle according to claim 7, wherein the detection signal is an outside air temperature, an inside air temperature, and a skin temperature, and the lower the temperature, the higher the regulation value (To) is set to a blowout temperature. Air conditioner.

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