JP2551003B2 - Automatic air conditioning control system for vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle air conditioning control device, and more particularly to a switching mode of an inside / outside air switching damper by utilizing a detection result of the outside air temperature by an outside air temperature sensor. The present invention relates to a vehicular automatic air conditioning control device for automatically controlling the opening degree of an air mix damper.

(Prior Art) Conventionally, in this type of vehicle automatic air conditioning control device, the outside air temperature sensor is located in the engine room of the vehicle at the position where the heat radiation energy from the engine is least likely to be received.
For example, it is usually arranged at the most front part in the engine room, that is, at the front side of the radiator.

(Problems to be Solved by the Invention) By the way, in such a configuration, while the vehicle is traveling, the outside air temperature sensor is satisfactorily affected by the flow of outside air and is affected by the heat radiation energy from the engine. Without
The actual temperature of the outside air can be detected correctly. However,
When the vehicle stops, the flow of the outside air disappears, so that the outside air temperature sensor may be affected by the heat radiation energy from the engine and may not be able to correctly detect the actual temperature of the outside air. For example, in the winter, when the engine is warmed up sufficiently by its start and then stopped for a short time and then restarted, it is based on the residual heat dissipation energy immediately after the engine is stopped. Since the temperature inside the engine room will be kept high, the outside temperature sensor will mistakenly consider the high temperature inside the engine room as the actual temperature outside air, even though the actual outside temperature is actually low. The situation of detecting occurs. As a result, based on such a false detection result of the outside air temperature sensor, if the switching mode of the inside / outside air switching damper or the opening degree of the air mix damper is controlled, the outside air may be introduced even though the inside air should be introduced. Or, even if the maximum heating control should be performed, the problem occurs that the maximum cooling control is performed.

Therefore, the present invention, in order to deal with such defects,
In an automatic air conditioning control system for a vehicle, the temperature rise in the engine room due to the residual heat dissipation energy of the engine at the start of the engine in winter is erroneously detected as the actual outside temperature by an outside temperature sensor provided in the engine room. Also, it is intended to properly perform the heating control of the vehicle interior without being affected by this.

(Means for Solving Problems) In solving the above problems, the present invention, as shown in FIG. 1, includes a temperature setting means 1 for setting a desired temperature in a vehicle interior of a vehicle as a set temperature, and a vehicle interior. Inside temperature detecting means 2 for detecting the actual temperature of the vehicle as the inside temperature, outside temperature detecting means 3 for detecting the actual temperature inside the engine room of the vehicle as the outside temperature, and the set temperature A temperature control means 4 for automatically controlling the actual temperature inside the vehicle compartment to the set temperature based on the inside temperature detected by the inside temperature detecting means and the outside temperature detected by the outside temperature detecting means. In the automatic air conditioning control device, the water temperature detecting means 5 for detecting the actual temperature of the cooling water of the engine cooling system of the vehicle as the cooling water temperature, and the outside air temperature detected by the outside air temperature detecting means while the vehicle is traveling are First temperature determining means 6 for determining whether or not the temperature falls within a predetermined low temperature range in winter when the engine is started.
A second temperature determining means 7 for determining whether or not the cooling water temperature detected by the water temperature detecting means at the time of starting the engine belongs to a predetermined high temperature region; and an inside temperature detected by the inside air temperature detecting means at the time of starting the engine. A third temperature determining means 8 for determining whether or not the air temperature is lower than an outside air temperature detected by the outside air temperature detecting means at the time of starting the engine; a determination that the first temperature determining means belongs; When the three determinations, which are the determination of belonging by the temperature determination unit and the determination of low by the third temperature determination unit, are satisfied, the outside air temperature detected by the outside air temperature detection unit at the time of starting the engine is more than that. A temperature correction unit 9 for correcting the temperature to a low value, and the temperature control unit, when the three determinations are satisfied,
Instead of the outside air temperature detected by the outside air temperature detection means, a correction value by the temperature correction means is selected, and the actual temperature inside the vehicle is automatically set to the set temperature based on the correction value, the set temperature and the inside air temperature. It is configured to control automatically.

[Action effect]

In the present invention thus constituted, when the engine is started, the first temperature determination means determines whether the outside air temperature detected by the outside air temperature detection means while the vehicle is traveling as described above belongs to the predetermined low temperature region in winter. The second temperature determining means determines whether the cooling water temperature detected by the water temperature detecting means belongs to a predetermined high temperature region, and the third temperature determining means detects the inside air temperature detecting means when the engine is started. It is determined whether the inside air temperature is lower than the outside air temperature detected by the outside air temperature detecting means when the engine is started.

Here, when the three determinations including the determination of belonging by the first temperature determination means, the determination of belonging by the second temperature determination means, and the determination of low by the third temperature determination means are satisfied, the outside air temperature detection means The temperature correction means corrects the outside air temperature detected by the outside air temperature detection means at the time of starting the engine to a value lower than this, considering that it is erroneously detected due to the influence of the heat radiation energy of the engine.

Then, at this time, the temperature control means selects a correction value by the temperature correction means instead of the outside air temperature detected by the outside air temperature detection means, and based on this correction value, the set temperature, and the inside air temperature, the reality of the vehicle interior The temperature of is automatically controlled to the set temperature.

For this reason, when the vehicle is stopped, the actual temperature inside the engine room is rising due to the residual heat dissipation energy of the engine in a sufficiently warm state. Even if the detection means erroneously detects the outside air temperature, the heating control in the vehicle after the engine is started is appropriately performed according to the correction value by the temperature correction means without being affected by the erroneous detection by the outside air temperature detection means. Can be done.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 shows an example of a vehicle automatic air conditioning control device according to the present invention. This automatic air conditioning control device is provided with an air duct 10A, and inside the air duct 10A, from the inside air introduction port 11 and the outside air introduction port 12 to the air outlet 13 into the vehicle interior of the vehicle, an inside / outside air switching damper 14 is provided. The blower 15, the evaporator 16, the air mix damper 17, and the heater core 18 are sequentially arranged. The inside / outside air switching damper 14 is the first
(Or second) switching position, and the outside air inlet 12
(Or, open the inside air inlet 11).

By its operation, the blower 15 introduces the outside air from the outside air introduction port 12 or the air in the vehicle interior (hereinafter referred to as inside air) into the air duct 13 through the inside / outside air switching damper 14 and sends it to the evaporator 16. Evaporator 16 cools the airflow from blower 15. The air mix damper 17 has an inflow amount of the cooling air flow from the evaporator 16 to the heater core 18 and an outlet 13 from the evaporator 16 depending on the actual opening degree.
Adjust the ratio of the cooling air flow to the direct inflow to. The heater core 18 heats the cooling air flow from the air mix damper 17.

Further, the automatic air conditioning control device, the temperature setter 10, each sensor 20,30,40, the temperature setter 10 and each sensor 20,30,40.
The A / D converter 50 connected to the A / D converter 50, the battery B, and the microcomputer 60 connected to the ignition switch IG of the vehicle are provided.
Generates a set temperature signal by setting the temperature of the rod in the vehicle compartment. The inside air temperature sensor 20 detects the actual temperature inside the vehicle compartment and generates it as an inside air temperature detection signal. The outside air temperature sensor 30 is arranged in front of the radiator in the engine room of the vehicle, and the outside air temperature sensor 30 detects the actual temperature near the arrangement position and detects it as an outside air temperature detection signal. appear. The water temperature sensor 40 detects the actual temperature of the cooling water of the engine cooling system of the vehicle and generates it as a water temperature detection signal.

The A / D converter 50 sets the set temperature signal of the temperature setter 10, the inside air temperature detection signal from the inside air temperature sensor 20, the outside air temperature detection signal from the outside air temperature sensor 30, and the water temperature detection signal from the water temperature sensor 40. Digitally converts the temperature digital signal, the inside temperature digital signal, the outside temperature digital signal and the water temperature digital signal. The microcomputer 60 executes the computer program in cooperation with the AD converter 50 according to the flowchart shown in FIG. 3, and during this execution, the drive circuit for the actuator 80 connected to the inside / outside air switching damper 14. 70a and air mix damper 17
The arithmetic processing necessary for each drive of the drive circuit 70b for the actuator 90 connected to is performed. However, the microcomputer 60 receives a DC voltage from the battery B via the ignition switch IG and starts operating. Further, the RAM of the microcomputer 60 also receives a DC voltage from the battery B at all times, and also functions as a backup RAM. The computer program described above is stored in advance in the ROM of the microcomputer 60.

In the present embodiment configured as described above, if the engine (which is in a sufficiently cold state) of the vehicle is started in winter and the ignition switch IG is closed to heat the interior of the vehicle, the microcomputer 60 causes the battery It operates by receiving a DC voltage from B through the ignition switch IG, and starts executing the computer program in step 100 according to the flowchart of FIG. At this stage, the RAM of the microcomputer 60 stores the flag F as F = 1 immediately before the opening of the ignition switch IG in the previous state in a state where the DC voltage is constantly received from the battery B. To do. However, F = 1 indicates that the detection result of the outside air temperature sensor 30 corresponds to the normal actual outside air temperature in winter. On the other hand, the flag F = 0 indicates that the detection result of the outside air temperature sensor 30 corresponds to the fact that the actual outside air temperature is high as in summer or the outside air temperature is abnormal in winter.

When the computer program proceeds to step 110, the microcomputer 60 initializes its various built-in elements, resets its internal timer, and starts its RAM.
To read F = 1. At this time, timing is started by the timer or the reset start thereof. Then, in step 120 (which constitutes the first temperature determination means), the microcomputer 60 sets "Y" based on the flag F = 1 in step 110.
ES ”. This means that the natural environment of the vehicle is in winter. However, at this stage, since the actual temperature of the cooling water in the engine cooling system has not risen and remains low since the engine was just started, the microcomputer 60 causes the water temperature digital signal from the A / D converter 50 to appear. Based on the value (hereinafter referred to as the water temperature digital value Tw), it is determined to be "NO" in step 130 (which constitutes the second temperature determining means), and in step 180, the AD converter 50 is used.
The value of the outside air temperature digital signal (hereinafter referred to as the outside air temperature digital value Tam) <15 ° C (R of the microcomputer 60
It is determined to be “YES” based on (previously stored in OM), and step 1
At 80a, set F = 1 and proceed to the normal air conditioning control routine 190 of the computer program.

When the vehicle is started in such a state, the outside air temperature sensor 30 is maintained in the flow of outside air generated by the traveling of the vehicle, so that the engine becomes sufficiently warm and the heat radiation energy Even if the engine is released, the actual temperature inside the engine room is properly maintained at the actual outside temperature outside the vehicle. Therefore, the outside air temperature sensor 30 correctly detects the actual outside air temperature with the actual temperature inside the engine room and generates it as an outside air temperature detection signal without being affected by the heat radiation energy of the engine. Therefore, the microcomputer 60 causes the value of the normal outside air temperature detection signal from the outside air temperature sensor 30, that is, the normal outside air temperature digital value Tam = Tamo (fourth
The calculation in the air conditioning control routine 190 is performed on the basis of FIG. As a result, the heating control of the vehicle interior can be properly performed.

Then, at time t = to, when the vehicle is temporarily stopped and the ignition switch IG is opened, the flag F (that is, F = 1 in step 180a) immediately before the ignition switch IG is opened is set by the microcomputer. 60
The RAM is stored and retained as is based on the backup function. In addition, since the flow of outside air that has occurred during the running of the vehicle disappears when the vehicle stops, the outside air temperature sensor 30
However, the actual temperature outside the vehicle is affected by the actual temperature rise inside the engine room due to the residual heat dissipation energy of the engine (corresponding to the water temperature digital value Tw of 40 ° C or higher), and the actual temperature outside the vehicle is Although it is on the broken line q), the actual temperature rise in the engine room (see the rising curve portion of the solid line P in FIG. 4) is erroneously detected as the actual outside temperature. It should be noted that, in addition, in addition to FIG. 4, a portion within the range of 0 ≦ t ≦ to in the horizontal line portion of the solid line P is an outside air temperature digital equivalent to the actual temperature in the engine room during traveling of the vehicle. The value Tam = Tamo is specified. In addition, after the vehicle is stopped as described above (t1
-T0) (for example, 5 minutes), the actual temperature in the engine room rises along the rising curve portion of the solid line P according to the residual heat radiation energy of the engine, and then the engine is restarted. The actual temperature of is suddenly lowered by the disappearance of the residual heat dissipation energy of the engine and becomes a value equivalent to Tamo.

Then, during the erroneous detection of the outside air temperature sensor 30 as described above, when the ignition switch IG is closed and the engine is restarted and the microcomputer 60 is restarted, the microcomputer 60 performs the same operation as described above. The execution of the computer program is started in step 100, initialized in step 110, the timer is reset and started, and the flag F = 1 already stored in the RAM is read. At this time, the timer starts counting at the same time as it is started, as described above. Next, in step 120, the microcomputer 60 determines “YES” based on the flag F = 1 in step 110, and in step 130, based on the water temperature digital value Tw ≧ 40 ° C. from the AD converter 50. Determined as "YES". In this case, Tw ≧ 40 ° C. is due to the residual heat radiation energy after the engine is stopped. The above 40 ° C is the RO of the microcomputer 60.
Pre-stored in M.

After determining “YES” in step 130 as described above, the microcomputer 60 sets A in step 130a.
-The value of the internal temperature digital signal from the D converter 50 (hereinafter,
Inside temperature digital value Tr) and outside temperature digital value
Temporarily remember Tam. However, at this stage, since the outside temperature sensor 30 is in the erroneous detection state as described above,
Tr <Tam holds. Therefore, the microcomputer 60
However, in step 140 (which constitutes the third temperature determination means), it is determined to be "YES", and in step 140a (which constitutes the temperature correction means), the internal air temperature digital value Tr in step 130a is determined.
The predetermined inside air temperature value α is subtracted from this and the subtraction result is updated to Tra, and at the same time the predetermined inside air temperature value β is subtracted from the inside air temperature digital value Tr in step 130a and the subtraction result is updated to the outside air temperature digital value Tamb. However, both the predetermined internal air temperature values α and β are stored in advance in the ROM of the microcomputer 60, so that 0 ° C. ≦ α ≦ 5 ° C., 0 ° C. ≦ β ≦ 20 ° C. and α <β are satisfied. , Α and β are defined.

Thereafter, in step 140b, the microcomputer 60 determines the value of the set temperature digital signal from the A / D converter 50 (hereinafter referred to as the set temperature digital value Ts) and step 140a in step 140b. A required outlet temperature Tao from the air duct 10 to the passenger compartment is calculated according to the updated inside temperature digital value Tra and the updated outside temperature digital value Tamb.

Tao = KsTs-KrTra + KamTamb + C (1) However, in the formula (1), each symbol Ks, Kr, Kam indicates a correction coefficient, and the symbol C indicates a constant. The equation (1) is stored in advance in the ROM of the microcomputer 60. After calculating the required outlet temperature Tao as described above, the microcomputer 60 calculates the target opening of the air mix damper 17 according to the required outlet temperature Tao in the same step 140b, generates it as an opening output signal, and gives it to the drive circuit 70b. . Then, the microcomputer 60 makes a step at the next step 140c.
Based on the updated inside air temperature digital value Tra and the updated outside air temperature digital value Tamb in 140a, it is determined that the inside air introduction mode should be set, and an inside air introduction output signal is generated and given to the drive circuit 70a.

Then, the actuator 80 becomes
The inside / outside air switching damper 14 is driven by the drive circuit 70a responsive to the inside air introduction output signal from 60 to change the inside / outside air switching damper 14 in the second switching position. Further, the actuator 90 is driven by the drive circuit 70b responding to the opening output signal from the microcomputer 60 to adjust the actual opening of the air mix damper 17 toward the target opening. In such a case, the adjusting action of the actuator 90 with respect to the air mix damper 17 is performed by the air mix damper like the opening sensor incorporated in the actuator 90.
It is performed in comparison with the detection result of the actual opening degree of 17. At the present stage, the inside air temperature digital value Tr in step 130a <outside air temperature digital value Tam in step 130a, and the timer measured value D <the predetermined measured value D
Based on o, the determinations in steps 150 and 160 are “NO” and “YES” sequentially. However, the predetermined time value Do is the time required for the heat radiation energy to disappear after restarting after the engine has been sufficiently warmed up (that is, the reality in the engine room after restarting after the engine has been sufficiently warmed up). Is slightly longer than the time required for the temperature to fall to the actual temperature of the normal outside air), and is stored in advance in the ROM of the microcomputer 60 as 6 (minutes), for example.

After that, each step 120, 130,
The circulation operation through 130a, 140, 140a, 140b, 140c, 150 and 160 is repeated to maintain the second switching position of the inside / outside air switching damper 14 and set the actual opening of the air mix damper 17 to the target opening. Adjust. As a result, automatic heating control of the passenger compartment is properly realized under the action of the blower 15, the evaporator 16 and the heater core 18. In such a state, the latest internal temperature digital value Tr and external temperature digital value Ta from the A / D converter 50, which are temporarily stored in step 130a, are stored.
When m satisfies Tr ≧ Tam, the microcomputer 60
In step 150, it is determined to be "YES", and the computer program proceeds to step 180. In other words, step 140a
In accordance with the opening adjustment of the air mix damper 17 and the switching adjustment of the inside / outside air switching damper 14 based on the update result in the above, despite the above-described erroneous detection of the outside air temperature sensor 30, heating control of the vehicle interior in the winter season is appropriate. Automatically, the latest internal temperature digital value Tr ≥ step 130a
When the latest ambient temperature digital value Tam in 130a is established, it is determined that the cause of the erroneous detection state of the ambient temperature sensor 30 has disappeared based on the radiator fan or the flow of ambient air due to the traveling of the vehicle, and the computer program step 150 To 180 is permitted.

After that, the outside temperature digital value in step 130a
When Tam <15 ° C. is established, the microcomputer 60 determines “YES” in the outside air temperature step 180, sets F = 1 in step 180a, and executes the air conditioning control routine 190. Further, as described above, when the determination in step 160 is “NO” before the determination in step 150 is “YES”, the microcomputer 60 stops the timer in step 160 to stop the computer program. To step 180. In other words, the determination of “YES” in step 160 is such that the condition sufficient for the determination of “YES” in step 150 is satisfied to keep the measured value D> Do.
This is done under the assumption that it has been realized by, and the transition from step 160 to step 160a of the computer program is allowed. After that, the microcomputer 60 performs the operation after the determination of "YES" in step 150.

As explained above, in the winter, the vehicle running under the operation of a sufficiently warm engine is stopped, and the engine is stopped for a short time only by opening the ignition switch IG, and then the ignition switch IG is restarted. When the engine is restarted and the heating control of the vehicle compartment is performed, the actual temperature in the engine room rises due to the residual heat dissipation energy of the engine, and the outside air temperature sensor 30 detects the actual temperature rise in the engine room. It will be detected as the outside temperature.

However, in such a state, in response to the reclosing of the ignition switch IG based on the flag F = 1 set in step 180a before the reclosing of the ignition switch IG as described above, The determination in step 120 is “YES”, the determination in step 130 is “YES” based on the water temperature digital value Tw ≧ 40 ° C., and the inside air temperature digital value Tr in step 130a <the outside air temperature digital value Tam in step 130a. The determination in step 140 is “YES”. Then, step 140a
In step 130a, the internal temperature digital value Tr
Is subtracted by a predetermined temperature value α and updated to Tra, and the inside air temperature digital value Tr in step 130a is subtracted by a predetermined temperature value β and updated to Tamb.

After that, the calculation of the required outlet air temperature Tao and the determination of the inside / outside air switching mode in step 140b are performed in consideration of the updated inside temperature digital value Tra and the updated outside temperature digital value Tamb in step 140a. Therefore, the outside temperature sensor 30
Despite the above-mentioned erroneous detection, the actual opening of the air mix damper 17 is adjusted toward the proper target opening required for heating control according to the update result in step 140a, and the inside / outside air switching damper 14 is adjusted. Also, in accordance with this, the inside air introduction mode is maintained. In such a case, the RAM of the microcomputer 60 under the opening of the ignition switch IG
The amount of power consumption required for the backup of 1 is a small amount of electricity required for storing and holding the flag F, and therefore is also useful for saving the power consumption of the battery B. Also, the execution of the computer program in steps 120 to 160 is limited to only a short time after the ignition switch IG is reclosed, and after that, the operation shifts to the execution of the air conditioning control routine 190. The arithmetic processing is not repeated unnecessarily.

If the determination in step 130 is “NO”, or if the determination in step 140 is “NO”, the microcomputer 60 returns “N” in step 170.
After determining "O", the computer program proceeds to the air conditioning control routine 190. In summer, Tam> 15
Since ° C is satisfied, the determination in step 180 is "NO".
Therefore, the flag F is set to "0" in step 180b, and the determination of "YES" in step 120 is prohibited.

Incidentally, in carrying out the present invention, 40 ° C. in step 130 or 15 ° C. in step 180, or the predetermined time value Do in each step 160, 170 may be appropriately changed as necessary, for example, step 170 The predetermined time count value Do in D may be D1 (≠ Do). Also, inside temperature digital DC power supply Tr and outside temperature digital value Tam
In place of step 160, it is also possible to adopt each step such that the determination is made in 2 minutes and 6 minutes, respectively.

Further, in carrying out the present invention, α in step 140a may be set to zero, and in step 130a
Tam may be directly subjected to subtraction correction without depending on Tr.

[Brief description of drawings]

1 is a block diagram showing the configuration of the invention described in the claims, FIG. 2 is a block diagram showing an embodiment of the present invention, FIG. 3 is a flowchart showing the operation of the microcomputer in FIG. 2, and FIG. 4 is a time chart showing the temperature state in the engine room during operation of the engine or short-time stop. Explanation of symbols 10 …… Temperature setting device, 14 …… Inside / outside air switching damper, 17 …… Air mix damper, 20 …… Inside air temperature sensor, 30 …… Outside air temperature sensor, 40 …… Water temperature sensor, 60 …… Microcomputer , 70a, 70b …… Drive circuit, 80,90 …… Actuator.

Claims (1)

(57) [Claims] 1. A temperature setting means for setting a desired temperature inside a vehicle compartment as a set temperature, an inside air temperature detecting means for detecting an actual temperature inside the vehicle compartment as an inside air temperature, and an inside air temperature detecting means provided in an engine room of the vehicle. Outside temperature detecting means for detecting the actual temperature in the engine room as the outside temperature, the set temperature, the inside temperature detected by the inside temperature detecting means,
And based on the outside temperature detected by the outside temperature detecting means,
In an automatic air conditioning control device including temperature control means for automatically controlling the actual temperature inside the vehicle compartment to the set temperature, water temperature detection for detecting the actual temperature of the cooling water in the engine cooling system of the vehicle as the cooling water temperature Means for determining whether the outside air temperature detected by the outside air temperature detecting means while the vehicle is traveling belongs to a predetermined low temperature region in winter, and a first temperature determining means for starting the engine, and a first temperature determining means for starting the engine. A second temperature determining means for determining whether or not the cooling water temperature detected by the water temperature detecting means belongs to a predetermined high temperature region; and an inside air temperature detected by the inside air temperature detecting means at the time of starting the engine, at the time of starting the engine. Third determination of whether it is lower than the outside air temperature detected by the outside air temperature detecting means
Temperature determination means, determination of belonging by the first temperature determination means, the second
When the three determinations, which are the determination of belonging by the temperature determination unit and the determination of low by the third temperature determination unit, are satisfied, the outside air temperature detected by the outside air temperature detection unit at the time of starting the engine is more than that. A temperature correction unit that corrects the temperature to a low value, and the temperature control unit selects a correction value by the temperature correction unit instead of the outside air temperature detected by the outside air temperature detection unit when the three determinations are established. However, the vehicle automatic air conditioning control device is characterized in that the actual temperature inside the vehicle compartment is automatically controlled to the preset temperature based on the correction value, the preset temperature, and the internal temperature.