JPH0620810B2 - Air conditioning controller for automobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention has a cool air bypass passage capable of controlling the head temperature in the passenger compartment, and improves the air conditioning feeling in the early stage of riding during an intermediate period or the like. The present invention relates to an air conditioning control device for an automobile.

(Prior Art) In an air conditioning control device for a vehicle, a cool air bypass passage for blowing out cool air is provided separately from a conventional air conditioning passage so that hot flashes on the head of an occupant are removed to generate head cold foot heat. It has been proposed to automatically drive the cold air bypass door to positively guide the cold air to the head to improve the air conditioning feeling of the head. For example, in Japanese Examined Patent Publication No. 63-45965, when the amount of solar radiation detected by the solar radiation detecting means is larger than a predetermined value, the cold air bypass door is moved to open the cold air bypass passage.
When there is a request to strongly heat the passenger compartment, the cold air bypass passage is closed to provide a quick heating sensation to the occupants. There is disclosed a technique for preventing the inconvenience of being lost.

(Problems to be Solved by the Invention) However, the above-described technique is intended to improve the air conditioning feeling when the amount of solar radiation is equal to or greater than a predetermined value. Outside temperature is 0 ° C
If the vehicle is parked for a long time (about 20 to 20 degrees Celsius), heat may accumulate in the upper part of the passenger compartment. Even if the air conditioner is operated by the above, there is a disadvantage that the cold air bypass passage is not opened and the air conditioning environment near the head is not improved.

In particular, when the photodiode is used to detect solar radiation, the output value fluctuates greatly depending on the presence or absence of solar radiation. The cold air bypass passage is not opened even if the above-mentioned air conditioner is operated, and the air conditioning feeling near the head cannot be improved promptly.

Therefore, in the present invention, even when the signal from the solar radiation detecting means is small, when a heat quantity that causes discomfort is accumulated in the upper part of the vehicle compartment, it is promptly removed to improve the head air conditioning feeling. An object of the present invention is to provide an automobile air conditioning control device.

(Means for Solving the Problem) However, the gist of the present invention is that, as shown in FIG. 1, the temperature of the air sucked into the air-conditioning passage by the blower is adjusted, and the air is blown from the open air outlet. In a vehicle air-conditioning control device having a bypass passage for blowing cold air in the air-conditioning passage to the upper body of an occupant and a bypass door for controlling the opening and closing of the bypass passage, the temperature control air A mode switching means 100 for switching the blowout mode, a bypass door opening degree setting means 200 for setting the opening degree of the bypass door, a blowout mode switching by the mode switching means 100, and a bypass passage by the bypass door opening degree setting means 200. Based on at least the amount of solar radiation and the head set temperature set as the target temperature near the head of the occupant A control signal calculation unit 300 for calculating the temperature, an outside temperature determination unit 400 for determining whether the outside temperature is a temperature in a predetermined intermediate range, and a deviation between the representative temperature in the vehicle interior and the temperature near the occupant's head. Temperature deviation detecting means 500 for detecting
When it is determined that the outside air temperature is in a predetermined intermediate range by 0, and the temperature deviation detected by the temperature deviation detecting means 500 is a predetermined value or more, the control signal calculated by the control signal calculating means 300 is sent to the upper part of the vehicle. It is provided with a control signal correction means 600 for shifting so that cold air blowing control can be performed.

(Operation) Therefore, when the solar radiation is strong in the intermediate period, the blowout mode and the opening of the bypass passage are set by the control signal calculated based on at least the solar radiation amount and the head set temperature. The temperature control is performed in consideration of the thermal sensation caused by solar radiation. Even if the solar radiation is weak, if the heat is trapped in the passenger compartment and the temperature deviation near the head of the passenger compartment is large, the blowing mode or the opening of the bypass passage may be decreased to lower the temperature in the upper passenger compartment. The occupant's upper body is reset to supply cold air. Therefore, the temperature control of the upper part of the vehicle can be appropriately performed even in an intermediate period when there is no or little solar radiation, and the above-mentioned problem can be achieved.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 2, the air conditioning control device for a vehicle is shown in FIG.
An intake door switching device 2 is provided on the most upstream side of the intake door switching device 2. In the intake door switching device 2, an inside air / outside air switching door 5 is arranged at a portion where an inside air inlet 3 and an outside air inlet 4 are separated. Is operated by the actuator 6 so that the air introduced into the air conditioning passage 1 can be selected from inside air and outside air.

The blower 7 sucks air into the air conditioning passage 1 and blows the air downstream, and an evaporator 8 and a heater core 9 are provided behind the blower 7.

The evaporator 8 constitutes a cooling cycle by being pipe-connected with a compressor or the like (not shown), and cools the air sucked into the air conditioning passage 1. The heater core 9 is adapted to circulate cooling water from an engine (not shown) to heat the air. In front of this heater core 9, the opening degree of the air mix door 10 is set to the actuator 1
By adjusting with 1, the amount of air passing through the heater core 9 and the amount of air bypassing the heater core 9 can be changed,
As a result, the temperature of the blown air is controlled.

The downstream end of the air-conditioning passage 1 is divided into a defrost outlet 12, an upper outlet 13, and a lower outlet 14 to open to a vehicle compartment 15, and the mode doors 16 and 1 are provided at the divided portions.
7, 18 are provided, and the mode doors 16, 17, 18 are provided.
By operating the actuator 19 with, the desired blowout mode can be obtained.

Further, this device is provided with a bypass passage 20 that bypasses a part of the air conditioning passage 1. This bypass passage 2
0 has one end connected to the downstream side of the evaporator 8 of the air conditioning passage 1 and upstream of the air mix door 10 and the other end connected to the front side of the upper air outlet 13, respectively. A part can be directly supplied to the upper outlet 13. The amount of cold air supplied through the bypass passage 20 can be adjusted by controlling the opening degree of the bypass door 21 with the actuator 22.

Reference numeral 25 denotes a vehicle interior temperature detector that detects a representative temperature Tr in the vehicle interior, and is attached to an instrument panel or the like. Further, 26 is a head temperature detector mounted on the ceiling of an automobile or the like for detecting a temperature Trh around the head, 27 is an outside air temperature detector for detecting an outside air temperature Ta, and 28 is a solar radiation amount T.
A solar radiation detector for detecting s, 29 is an evaporator 8 or an evaporator blowout temperature sensor provided immediately after the evaporator 8 for detecting the cooling capacity of the air by the evaporator 8 as the temperature of the evaporator 8 or the temperature of the air passing through the evaporator 8. , These output signals are selected via a multiplexer (MPX) 31 and are converted into digital signals via an A / D converter 32 to be converted into a microcomputer.
Entered in 33.

Further, 34 is an opening detector that detects the opening of the bypass door 21, 35 is a position detector that detects the positions of the mode doors 16, 17 and 18, and 36 is an opening that detects the opening of the air mix door 10. These are detectors, and their output signals are also input to the microcomputer 33 via the multiplexer 31 and the A / D converter 32.

Furthermore, output signals from the control panel 37, the temperature setting device 38, and the head temperature setting device 39 are input to the microcomputer 33.

The control panel 37 displays the blowout mode in the VENT mode,
The mode switches 40a to 40d for manually setting the BI-L mode, HEAT mode, and DEF mode, the A / C switch 41 for operating the cooling cycle, the rotation speed of the blower 7 are low speed (FAN1), medium speed (FAN2), and high speed. (FAN
3), the fan switches 42a to 42c, the AUTO switch 43 for automatically controlling all the air conditioners such as the blower, and the OFF switch 4 for stopping the driving of the air conditioners.
It is equipped with 4.

The temperature setter 38 includes up / down switches 45a and 45b.
And a display section 46 for displaying the set temperature, and the set temperature shown on the display section 46 can be changed within a predetermined range by operating the up / down switches 45a and 45b. Further, the head temperature setting device 39 includes, for example, a dial type knob 47, and can change the head setting temperature Ths within a predetermined range set in advance. The temperature setter 38 and the head temperature setter 3
9 may be of a type in which a template bar is slid.

The microcomputer 33 is a well-known one having a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), an input / output port (I / O), etc., which are not shown, and the various types described above. Based on the input signal, control signals are output to the actuators 6, 11, 19, 22 and the motor of the blower 7 via drive circuits 48a to 48e, respectively, and the doors 5, 10, 16, 17, 1 are controlled.
The drive control of 8 and 21 and the rotation control of the motor are performed.

Next, an example of control operation of the microcomputer 33 will be described.

FIG. 3 shows a flowchart of the main routine of the vehicle air conditioning control device of the present invention. The control is started from step 50, and in step 52, the setting operation signal and the temperature setter 38 by the control panel 37 are set.
Setting signal input processing for inputting a setting signal and the like to the microcomputer 33, and a heat load detection signal, that is, an outside air temperature detector 27, a vehicle interior temperature detector 25, a head temperature detector 26, a solar radiation detector 28, The detection signal input process of inputting each detection signal Ta, Tr, Trh, Ts, Te of the air outlet temperature sensor 29 or the like to the microcomputer 33 is performed, and the process proceeds to step 56. In step 56, the signal input in step 52 is used to calculate the total signal T ₁ corresponding to the heat load in the passenger compartment according to the equation (1).

T ₁ = K ₁ (Tr-25) + K ₂ (Tad-25) + K ₃ Tsc-K ₄ (Td-25) + C ₁ + C ₂ (1) where K _{1 to} K ₄ are calculation coefficients, and C ₂ is It is an arithmetic constant.
Further, Tad is the outside air temperature Ta detected by the outside air temperature sensor 27 subjected to predetermined signal delay processing, and Tsc is the amount of solar radiation Ts detected by the solar radiation detector 28 subjected to predetermined signal processing, Detailed description here is omitted.

Further, C ₁ is defined by the following equation (2).

C ₁ = K ₅ (0-Tad) (2) However, it is applicable only when Tad is 0 ° C. or lower,
When it is higher than 0 ° C., C ₁ = 0.
Here, K ₅ is a calculation coefficient.

Further, it calculates the operation of the overall signal T ₂ of the air mixing door opening control for the addition of the evaporator air outlet temperature Te to this complex signal T ₁ as a regulator in that (3) below, and further,
Head comprehensive signal T _{3 for} controlling the opening degree of the cold air bypass door
Is calculated by equation (4).

T ₂ = T ₁ + K ₅ (Te-5) (3) where K ₅ is a calculation coefficient.

_{T 3 = K 6 · Tsc-} K 7 (Ths-25) ... (4) _where, K 6, _{K 7} are calculation coefficients, signal Tsc is representative of the amount of solar radiation is the signal processing described above, Ths the head set temperature Is. After this calculation, the process proceeds to step 58.

In step 58, the correction processing of T ₃ in the initial start of the air conditioning apparatus the ignition switch is turned on is performed. The specific content is as shown in FIG. 4, and in step 80, the microcomputer 33 determines whether Tad is within a temperature range (for example, 0 ° C. to 20 ° C.) corresponding to a predetermined intermediate period. If it is determined that Tad is within this predetermined range, the next step 82
Then, the deviation Trh-Tr of the temperature Trh around the head from the representative temperature Tr in the passenger compartment is a predetermined value (for example, 15 ° C.).
Or not. In this step 82,
Further, when it is determined that Trh-Tr is equal to or more than the predetermined value, a large amount of heat is accumulated around the head in the interim period, and it is necessary to remove this, and in this case, in step 84. After confirming that the blower 7 is rotating (ON), the internal timer of the microcomputer 33 is started (step 86).

Then, after starting the timer, it is determined in step 88 whether or not the operating time of the timer has exceeded a predetermined time (for example, 5 minutes), and until the predetermined time is reached, the value of T ₃ is determined in step 90. For example, a correction term (for example, 6.5 ° C.) is added as shown by the equation (5).

_{T 3 = K 6 · Tsc-} K 7 (25-Ths) +6.5 ... (5) Namely, the T ₃ was 6.5 ° C. shifted, the corrected _{T 3}
The opening degree of the bypass door and the blowing mode, which will be described later, are controlled. After the timer has passed the predetermined time, step 92
Then, the process proceeds to step S3 and gradually returns T ₃ to the value obtained in step 56 (for example, to obtain a change of 3 ° C. in 30 seconds). After steps 90 and 92, or in the case other than the intermediate period or when the temperature deviation around the head is small,
When the blower is not operating, the correction of T ₃ is not performed and the process directly proceeds to step 60.

In the next step 60, the T _F signal used for switching the blowing mode is calculated by the following equation (6).

T _F = Te + K ₈ · θxt (6) Here, Te is the post-evaporation temperature, K ₈ is a calculation coefficient, and θxt is the target opening of the air mix door. After performing this calculation, the process proceeds to step 62.

In step 62, the air volume of the blower 7 (voltage of the blower) and the evaporator outlet temperature (post-evaporator temperature) are controlled based on the calculation result of the total signal T ₁ , as shown in FIG. move on.

At step 64, as shown in FIG. 6, based on the calculation result of the comprehensive signal T ₂ for air mix door opening control,
The air mix door 10 is controlled, and step 66 is performed.
Go to.

In step 66, the blowing mode is switched as shown in FIGS. 7 (a) and 7 (b) based on the judgment value of switching the blowing mode and the _TF signal. The switching of the blowing mode is performed by comparing the _TF signal with the determination values T _{F1 to} T _F8.
A correction term α is added to the determination values of _{F1 to} T _F4 , and this α is three times the value of T ₃ (α = 3 when T ₃ ≧ 0).
・ T ₃ ), and when T ₃ <0, it is set to 0, and when 20 is exceeded, this 20 is used as the upper limit value of α.

In step 68, control of the bypass door 21 and the evaporator outlet temperature due to head overall signal T ₃ is performed as shown in FIG. 8, after the driving of the control amount determined by the step 62 to 68 in step 70 Output the signal to each air conditioner to drive it and then return step 72
Go to. Regarding the outlet temperature control of the evaporator,
The smaller one of the target temperature obtained based on T ₁ and the target temperature obtained based on T ₃ is used.

Therefore, even in the middle period, when the temperature deviation around the head is small, each air conditioner is controlled based on the total signal determined by equations (1) to (3), especially when the bypass door is opened. The degree and the blowing mode are also changed according to the magnitude of the solar radiation signal Tsc. At this time, when the solar radiation signal Tsc is small or does not exist due to the cloudiness of the sky, the temperature of the upper part of the passenger compartment (the temperature around the head) is uncomfortable when getting on if the control according to the formula (3) is performed. bypass door for T ₃ also has a higher becomes a small value is not opened. Also, when the heat mode is selected as the blowout mode, the mode automatically switches to the B / L unless the mode is manually switched to the bi-level mode (B / L), so that cold air is supplied to the upper body. It is difficult to expect. However, in such cases,
Bypass door 2 with T ₃ with the correction term according to equation (5)
Since the opening degree of 1 is controlled, the value of T ₃ becomes large and the bypass door 21 which has been closed until now can be opened to supply the cool air to the upper body of the occupant. Moreover,
Due to this increase of T ₃ , the blowout mode switching determination values of T _{F1 to} T _F4 greatly shift to the left and right in FIG. 7, so that B / L3
The blowing mode is automatically changed from B to L2, and the supply of cold air to the upper body can be further increased.

(Effects of the Invention) As described above, according to the present invention, even when the vehicle interior temperature control is started when there is no or weak intermediate solar radiation, the temperature deviation near the head in the vehicle interior is reduced. Since the temperature control in the upper part of the passenger compartment can be corrected in consideration, heat may be trapped inside the passenger compartment due to parking for a long time even if the solar radiation is small, or there was solar radiation before riding. However, even if it is cloudy when riding, it is possible to quickly remove the heat from the upper part of the passenger compartment and provide a comfortable head air conditioning feeling.

[Brief description of drawings]

FIG. 1 is a functional block diagram of the present invention, FIG. 2 is a schematic configuration diagram showing an embodiment of the present invention, FIG. 3 is a flow chart showing a main routine of a microcomputer used therein, and FIG. Total signal T at startup
Flowchart illustrating a _third correction routine, FIG. 5 is a characteristic line diagram showing the control of the evaporator outlet target temperature and blower voltage based on the overall signal T _1, FIG. 6 is of the air mix door target opening based on the total signal T ₂ Diagram showing characteristics, Fig. 7
(a) is a diagram showing the characteristics of the blowout mode based on the blowout mode control signal T _F , FIG. 7 (b) is a chart showing the specific contents of the blowout mode switching determination value, and FIG. 8 is a total signal T ₃ 6 is a diagram showing characteristics of an evaporator outlet target temperature and a cold air bypass door opening based on FIG. 1 ... Air-conditioning passage, 7 ... Blower, 12 ... Defrost outlet, 13 ... Upper outlet, 14 ... Lower outlet, 20
...... Bypass passage, 21 ...... Bypass door, 100 ......
Mode switching means, 200 ... Bypass door opening setting means,
300: control signal calculation means, 400: outside air temperature determination means, 500: temperature deviation detection means, 600: control signal correction means.

Claims (1)

[Claims] 1. A bypass for controlling the temperature of air sucked into an air-conditioning passage by a blower so that the air is blown out into an interior of a vehicle from an open air outlet and for guiding cool air in the air-conditioning passage to the upper body of an occupant. In an automotive air conditioning control device having a passage and a bypass door that controls opening and closing of the bypass passage, a mode switching unit that switches a blowing mode of temperature-controlled air, and a bypass door opening setting unit that sets an opening of the bypass door. And a head setting temperature set as a target temperature near at least the amount of solar radiation and the occupant's head with a control signal for switching the blowout mode by the mode switching means and the bypass door opening by the bypass passage opening setting means. A control signal calculating means for calculating based on the above, and an outside air temperature determining means for determining whether or not the outside air temperature is in a predetermined intermediate temperature range A temperature deviation detecting means for detecting a deviation between a representative temperature in the room and a temperature in the vicinity of the occupant's head, and the outside air temperature judging means judges that the outside air temperature is in a predetermined intermediate range, and the temperature deviation detecting means And a control signal correction means for shifting the control signal calculated by the control signal calculation means so that the cold air blowout control to the upper part of the vehicle can be performed when the deviation is a predetermined value or more. Air conditioning control system for automobiles.