JP2006281904A - Air-conditioner for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress deterioration of air-conditioning feeling when a vehicle window opens. <P>SOLUTION: When an opening/closing state of the vehicle window is determined, and the vehicle window is in an opening state, if a value obtained by subtracting outside air temperature Tam from a target blow-off temperature TAO is a negative value, the target blow-off temperature TAO is decreased by increase in vehicle speed. If a value obtained by subtracting the outside air temperature Tam from the target blow-off temperature TAO is a positive value, correction to increase the target blow-off temperature TAO is made by the increase in the vehicle speed, and the deterioration of the air-conditioning feeling is suppressed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a technique for correcting a target blowing temperature of a vehicle air conditioner used in a vehicle according to a vehicle speed.

  Conventionally, Patent Document 1 proposes a control for correcting a target blowing temperature of air blown into a vehicle compartment by a vehicle air conditioner when a vehicle door or window is opened.

In this prior art, when the door or window is opened in a steady state where the vehicle interior temperature is close to the set temperature set by the occupant by the vehicle air conditioner, the outside air is introduced into the vehicle interior and the temperature is different from the set temperature. Therefore, when the opening of the door or window is detected, the target blowing temperature is corrected so that the difference from the outside air temperature increases.
JP-A-57-201713

  However, in this prior art, the opening of the door or window is only detected and the target blowing temperature is corrected, so that the amount of outside air introduced into the passenger compartment increases as the vehicle speed increases, and the passenger compartment temperature and passenger The deviation from the set temperature is also increased as the vehicle speed increases. For this reason, the problem that a passenger | crew's air conditioning feeling deteriorates arises.

  The present invention has been made in view of the above points, and an object of the present invention is to suppress the deterioration of air conditioning feeling when an opening / closing mechanism capable of introducing outside air into a vehicle interior is opened.

  In order to achieve the above object, according to the first aspect of the present invention, there is provided calculation means (S4) for calculating a target blowing temperature (TAO) of air blown into the vehicle interior, and the target calculated by the calculation means (S4). In a vehicle air conditioner that controls the air conditioning state of a passenger compartment based on the air temperature (TAO), heat exchange means (11, 13) that cools or heats the air blown into the passenger compartment, and outside air is introduced into the passenger compartment When the open state of the opening mechanism is determined by the determining means (S51) for determining the open / closed state of the opening mechanism and the determining means (S51), the air blown into the vehicle interior by the heat exchange means (11, 13) During cooling that is cooled to a temperature lower than the air temperature (Tam), the target air temperature (TAO) is decreased by increasing the vehicle speed, and the air that is blown into the vehicle interior by the heat exchange means (11, 13) is outside air temperature (Tam). Ri at the time of heating is heated to a high temperature, characterized in that it comprises a target air temperature correcting means (S5) to increase the (TAO) by an increase in vehicle speed.

  According to this, even if the opening / closing mechanism is opened during traveling, the target outlet temperature (TAO) can be corrected according to the increase in the vehicle speed, so that deterioration of the air conditioning feeling can be suppressed.

  According to a second aspect of the present invention, in the vehicular air conditioner according to the first aspect, the correction means (S5) determines that the cooling is performed when the target blowing temperature (TAO) −the outside air temperature (Tam) is a negative value. When the target blowing temperature (TAO) −outside air temperature (Tam) is a positive value, the heating is performed.

  According to this, the target blowing temperature (TAO) minus the outside air temperature (Tam) is easily corrected to decrease or increase the target blowing temperature (TAO) depending on whether it is a negative value or a positive value. Can do.

  Here, the target blowing temperature (TAO) -outside air temperature (Tam) in the present claim is a negative value. The air blown into the vehicle interior by the heat exchange means (11, 13) is the outside air temperature (Tam). Air that is blown into the passenger compartment by the heat exchange means (11, 13) is when the temperature is cooled to a lower temperature and the target blowing temperature (TAO) −outside air temperature (Tam) is a positive value. Is heated to a temperature higher than the outside air temperature (Tam).

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

  FIG. 1 is a schematic diagram of the overall configuration of a vehicle air conditioner according to an embodiment of the present invention. The indoor unit of the vehicle air conditioner is roughly composed of a blower unit 1 and an air conditioner unit 2.

  The blower unit 1 includes an inside / outside air switching box 3 and a blower 4. The inside / outside air switching door 5 in the inside / outside air switching box 3 opens and closes the outside air introduction port 6 and the inside air introduction port 7. Thereby, outside air (vehicle compartment outside air) or inside air (vehicle compartment air) is switched and introduced into the inside / outside air switching box 3. The inside / outside air switching door 5 is driven by an electric drive device 8 comprising a servo motor. The blower 4 is provided with a centrifugal blower fan 9 and a drive motor 10.

  The air conditioning unit 2 is provided with an air conditioning case 2a that forms an air passage, and an evaporator (cooling heat exchange means) 11 of the refrigeration cycle is disposed upstream of the air flow in the air conditioning case 2a. An air mix door 12 is disposed on the downstream side. On the downstream side of the air mix door 12, a hot water heater core (heating heat exchanging means) 13 that heats the air using hot water (cooling water) of the vehicle engine as a heat source is installed. A bypass passage 14 that bypasses the hot water heater core 13 and flows air is formed on the side of the hot water heater core 13 (the vehicle upper portion).

  The air mix door 12 is a rotatable plate-like door and is driven by an electric drive device 15 including a servo motor. The air mix door 12 adjusts the air volume ratio between the hot air passing through the hot water heater core 13 and the cold air passing through the bypass passage 14, and is blown into the vehicle interior by adjusting the air volume ratio of the cold / hot air. Adjust the air temperature.

  A hot air passage 16 extending upward from the lower side of the vehicle is formed on the downstream side of the hot water heater core 13. The hot air from the hot air passage 16 and the cold air from the bypass passage 14 are mixed by the air mixing unit 17. Air at the desired temperature can be created.

  Further, an air outlet mode switching unit is configured on the downstream side of the air mixing unit 17 in the air conditioning case 2a. That is, a defroster opening 18 is formed on the upper surface of the air conditioning case 2a, and the defroster opening 18 blows air to the inner surface of the vehicle windshield through a defroster duct (not shown). The defroster opening 18 is opened and closed by a rotatable plate-like defroster door 19.

  Further, a face opening 20 is formed on the upper surface of the air-conditioning case 2a at the rear side of the vehicle from the defroster opening 18, and this face opening 20 is directed toward the upper body of the passenger in the vehicle cabin via a face duct (not shown). It blows out air. The face opening 20 is opened and closed by a rotatable plate-like face door 21.

  Further, in the air conditioning case 2a, a foot opening 22 is formed in a lower part of the face opening 20, and air is blown out from the foot opening 22 toward the feet of the passengers in the passenger compartment. The foot opening 22 is opened and closed by a rotatable plate-like foot door 23.

  The blow-out mode doors 19, 21, and 23 are connected to a common link mechanism (not shown), and are driven by an electric drive unit 24 including a servo motor via the link mechanism.

  Next, the outline of the electric control unit in the present embodiment will be described. The air-conditioning electronic control device 25 is composed of a well-known microcomputer including a CPU, a ROM, a RAM, and the like, and its peripheral circuits.

  The air-conditioning electronic control unit 25 has a well-known temperature sensor 26 for detecting the evaporator blowout temperature Te, the internal air temperature Tr, the external air temperature Tam, and the hot water temperature Tw at the part immediately after the air blowout of the evaporator 11 for air conditioning control. , 27, 28, 29, and a solar radiation sensor 30 for detecting the solar radiation amount Ts, etc. are input.

  In addition, the air conditioning control panel 31 installed in the vicinity of the vehicle interior instrument panel is provided with operation switches 32 to 36 that are manually operated by passengers, and operation signals of the operation switches 32 to 36 are also input to the air conditioning electronic control device 25. The

  Specifically, as the operation switch, a temperature setting switch 32 that generates a temperature setting signal Tset, an air volume switch 33 that generates an air volume switching signal, an air outlet mode switch 34 that generates an air blowing mode signal, and an inside / outside air switching signal are generated. An inside / outside air changeover switch 35, an air conditioner switch 36 for intermittently operating the compressor (not shown) of the refrigeration cycle, and the like are provided.

  Further, the detection signal of the vehicle speed sensor 37 for detecting the vehicle speed and the operation signals of the window switches 38, 39, 40, 41 are input to the air conditioning electronic control unit 25.

  The window switches 38, 39, 40, and 41 perform the opening / closing operation of the window serving as the opening mechanism in the present embodiment, and are for the driver's seat window, for the passenger seat window, for the driver seat rear seat window, and for the passenger seat rear seat, respectively. For windows. When the respective windows are opened, the window switches 38, 39, 40, 41 are opened (ON), and when the respective windows are closed, the window switches 38, 39, 40, 41 are closed (OFF). It comes to be in a state.

  Next, the operation of this embodiment in the above configuration will be described. The flowchart of FIG. 2 shows an outline of control processing executed by the microcomputer of the air conditioning electronic control device 25. The control routine of FIG. 2 supplies power to the control device 25 by turning on an ignition switch of a vehicle engine (not shown). Will start.

  First, in step S1, flags and timers are initialized, and in the next step S2, operation signals of the operation switches 32-36 of the air conditioning control panel 31 are read. In the next step S3, the vehicle environmental state signals, that is, the detection signals from the sensors 26 to 30, 37, the operation signals of the window switches 38, 39, 40, 41, and the like are read.

  Subsequently, in step S4, a target blowing temperature TAO of the conditioned air blown into the passenger compartment is calculated. This target blowing temperature TAO is a blowing temperature necessary for maintaining the passenger compartment at the set temperature Tset of the temperature setting switch 32, and is calculated based on the following formula F1.

TAO = Kset × Tset−Kr × Tr−Kam × Tam−Ks × Ts + C (F1)
Here, Tr is the inside air temperature detected by the inside air sensor 27, Tam is the outside air temperature detected by the outside air sensor 28, Ts is the amount of solar radiation detected by the solar radiation sensor 30, and Kset, Kr, Kam, Ks are the control gain and C is a constant for correction.

  Next, in step S5, the target blowing temperature TAO is corrected. The correction of the target blowing temperature TAO will be described later.

  Next, the target air volume of the air blown by the blower 4 is determined in step S6. Specifically, the blower voltage level applied to the blower driving motor 10 is determined based on the TAO with reference to a control map stored in advance in the air conditioning electronic control device 25.

  Next, in step S7, the inside / outside air mode is determined. In this inside / outside air mode, for example, the inside air mode is set when the inside temperature Tr is significantly higher than the set temperature Tset by a predetermined temperature or higher (during cooling high load), and the outside air mode is set at other times. Alternatively, as the TAO rises from the low temperature side to the high temperature side, the setting may be switched from the all-inside air mode → the inside / outside air mixing mode → the all outside air mode.

  Next, in step S8, the blowing mode is determined according to the TAO. As is well known, the blowing mode is switched from face mode to bi-level mode to foot mode as TAO rises from the low temperature side to the high temperature side.

  Next, in step S9, the target opening degree SW of the air mix door 12 is calculated by the following formula F2 based on the TAO, the evaporator outlet temperature Te, and the hot water temperature Tw.

SW = [(TAO−Te) / (Tw−Te)] × 100 (%) (F2)
Here, the target opening degree SW of the air mix door 12 sets the maximum cooling position of the air mix door 12 (solid line position in FIG. 1) to 0%, and the maximum heating position of the air mix door 12 (dotted line position in FIG. 1). Is expressed as a percentage with 100%.

  Next, the process proceeds to step S10, where the actual evaporator outlet temperature Te detected by the temperature sensor 26 is compared with the target evaporator temperature TEO determined based on the above TAO or the like, and an air conditioning compressor (not shown) is compared. The applied voltage to the electromagnetic clutch is determined, and the intermittent operation (ON-OFF) of the compressor operation is determined.

  Next, it progresses to step S11 and a control signal is output to various actuator parts (8, 10, 15, 24, etc.) so that the control state determined by said step S6-S10 may be obtained. In the next step S12, the process waits for the control period τ, and when it is determined that the control period τ has elapsed, the process returns to step S2.

  Next, the correction of the target blowing temperature TAO performed in step S5 will be described with reference to FIG. 3. First, in step S51, whether or not the window is open is determined based on the operation signal of the window switches 38, 39, 40, and 41. Judgment based on. When at least one window is in the open state, TAO is corrected in the following steps S52 to S55. If neither is open, the process proceeds to step S6.

  Specifically, in step S52, A = target blowing temperature TAO−outside temperature Tam is calculated. A is a negative value when the target blowing temperature TAO is lower than the outside air temperature Tam, and is a positive value when the target blowing temperature TAO is higher than the outside air temperature Tam. Moreover, it becomes 0 when the target blowing temperature TAO is equal to the outside air temperature Tam.

  Next, in step S53, the vehicle speed coefficient β is read. Specifically, it is determined based on the value of the vehicle speed sensor, and as shown in FIG. 4, β is 1 when the vehicle speed is 0 (km / h), and the value of β increases as the vehicle speed increases. The relationship between the vehicle speed and the vehicle speed coefficient β is determined based on actual vehicle evaluation. Next, in step S54, a correction amount Ctao for the target outlet temperature TAO is calculated based on the formula F3.

Ctao = α × β × A (F3)
Here, α is a control gain. When the target blowing temperature TAO and the outside air temperature Tam are equal, the correction value Ctao = 0. However, in general, when the target blowing temperature TAO and the outside air temperature Tam are equal, the air conditioning control is unnecessary, and thus the correction by the vehicle speed. I will not do it.

  Next, in step S55, TAO correction is performed. Specifically, a value obtained by adding the correction amount Ctao to the target blowing temperature TAO calculated in step S4 becomes the corrected target blowing temperature TAO.

  By the control as described above, it is possible to correct the target air temperature TAO to be decreased by increasing the vehicle speed during cooling when A is a negative value, and to increase the target temperature by increasing the vehicle speed during heating when A is a positive value.

(Other embodiments)
In the above-described embodiment, the embodiment in which the opening mechanism is a window has been described. However, the same correction can be performed when the opening mechanism is a sunroof. In this case, a roof switch that opens and closes the sunroof is used instead of the window switches 38, 39, 40, and 41.

  In the above-described embodiment, if A, which is the difference between the target outlet temperature TAO and the outside air temperature Tam, is a negative value, correction during cooling is performed, and if A is a positive value, correction during heating is performed. Although the embodiment has been described, the following method may be used.

  A range for correcting the target blowing temperature TAO is determined in advance, and a first predetermined temperature Tc for determining the upper limit of the temperature range for correction and a second predetermined temperature Th for determining the lower limit of the range for correction are set, and the target When the blowing temperature TAO <the first predetermined temperature Tc, it is determined that the cooling is being performed, and correction is performed. When the target blowing temperature TAO> the second predetermined temperature Th, the heating is determined, and correction is performed. .

1 is an overall configuration diagram of an embodiment of the present invention. It is a flowchart which shows control of the electronic controller for an air conditioning of one Embodiment of this invention. It is a flowchart which shows the principal part of control of the electronic controller for an air conditioning of one Embodiment of this invention. It is a control characteristic figure of vehicle speed coefficient beta in one embodiment of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Evaporator, 13 ... Hot water type heater core, 25 ... Electronic control unit for air-conditioning,
37 ... Vehicle speed sensor, 38, 39, 40, 41 ... Wind switch.

Claims (2)

Calculation means (S4) for calculating a target blowing temperature (TAO) of the air blown into the passenger compartment is provided, and the air conditioning state of the passenger compartment is determined based on the target outlet temperature (TAO) calculated by the calculating means (S4). In the vehicle air conditioner to be controlled,
Heat exchange means (11, 13) for cooling or heating the air blown into the vehicle interior;
Determining means (S51) for determining an open / closed state of an opening mechanism capable of introducing outside air into the vehicle interior;
When the open state of the opening mechanism is determined by the determining means (S51), the air that is blown into the vehicle interior by the heat exchange means (11, 13) is cooled to a temperature lower than the outside air temperature (Tam). At the time of heating, the target blowing temperature (TAO) is decreased by increasing the vehicle speed, and the air blown into the vehicle interior by the heat exchange means (11, 13) is heated to a temperature higher than the outside air temperature (Tam). A vehicle air conditioner comprising: correction means (S5) for increasing the target outlet temperature (TAO) by increasing the vehicle speed. The correction means (S5) sets the cooling time if the target blowing temperature (TAO) −outside air temperature (Tam) is a negative value, and the target blowing temperature (TAO) −outside air temperature (Tam) is a positive value. If it exists, it will be at the time of heating, The vehicle air conditioner of Claim 1 characterized by the above-mentioned.

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