JP3690008B2 - Outside air temperature detection device for vehicles - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is suitable for an outside air temperature detecting device for a vehicle, and in particular, an outside air temperature detected by this device is used as control data for a vehicle air conditioner.
[0002]
[Prior art]
Conventionally, Japanese Unexamined Utility Model Publication No. 63-197711 discloses an outside air temperature detected by a vehicle outside air temperature detecting device as control data for a vehicle air conditioner (hereinafter referred to as a gazette device). In this publication, when the engine is stopped for a short period and restarted, the outside air temperature sensor detects a value higher than the actual outside air temperature due to the influence of engine heat or engine cooling water. The following measures are taken.
[0003]
In addition, although it said that it received the influence of engine heat or engine cooling water, this is because the outside temperature sensor is often installed in the vicinity of the radiator in the engine room.
In the above publication apparatus, when the engine coolant temperature at the time of restarting the engine is higher than a predetermined temperature, the outside air temperature detected and stored by the outside air temperature sensor immediately before the engine is stopped is used as control data in order to cope with the above problem. doing. On the other hand, when the temperature of the engine coolant at the time of engine restart is lower than a predetermined temperature, the outside air temperature detected by the outside air temperature sensor at the time of engine restart is used as the control data.
[0004]
[Problems to be solved by the invention]
However, in the above publication device, for example, when the engine is stopped in the morning when the outside air temperature is not so high, and the vehicle is left in the sun for a long time, the engine coolant temperature rises due to the influence of sunlight. Thus, there is a problem that an outside air temperature lower than the actual temperature detected by the outside air temperature sensor in the morning is erroneously used as control data.
[0005]
SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle outside temperature detection device that can be selected as control data in a timely manner when the engine is restarted without being affected by solar radiation.
[0006]
[Means for Solving the Problems]
The present invention employs the following configuration as technical means.
In the invention according to claims 1 to 4,
Temperature detecting means (13, 15) capable of detecting the temperature (TR, Te) of the vehicle interior of the vehicle when the engine is started;
The predetermined value (T1) is set higher as the temperature in the passenger compartment detected by the temperature detection means (13, 15) at engine start increases.
[0007]
Thus, in the present invention, when the engine coolant temperature rises (when it does not decrease) due to the influence of solar radiation, it is noted that the temperature in the vehicle interior also increases due to solar radiation. Since the predetermined value is set higher, when the engine is started, one of the outside air temperature just before the engine is stopped without being affected by solar radiation and the outside temperature actually detected by the outside air temperature detecting means at the time of starting the engine Can be selected as control data.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to FIGS.
FIG. 1 shows an overall configuration diagram of a vehicle air conditioner 1.
The vehicle air conditioner 1 is a well-known one, and is configured by arranging each air conditioning functional component in an air conditioning case 2. A blower 3 that generates an air flow toward the passenger compartment is disposed on the air upstream side of the air conditioning case 2.
[0009]
The blower 3 is driven by a drive motor 3a as drive means. An outside air introduction port 8 and an inside air introduction port 9 are formed on the upstream side of the blower 3, and the outside air introduction port 8 and the inside air introduction port 9 are selectively opened and closed by an inside / outside air switching door 10. The inside / outside air switching door 10 is driven by a servo motor 25 as a driving means. As a result, the vehicle air conditioner 1 can switch between a known inside air circulation mode and an outside air introduction mode as the inside / outside air mode.
[0010]
In the air conditioning case 2, an evaporator 4, which is a heat exchanger for cooling, is disposed on one air downstream side of the blower 3 as a constituent part of a known refrigeration cycle (not shown). Here, the refrigeration cycle will be briefly described. A compressor that compresses and discharges a refrigerant, a condenser that condenses the refrigerant compressed by the compressor, and a refrigerant that is condensed by the condenser is decompressed. The pressure reducing device includes the evaporator 4 that is an evaporator for evaporating the refrigerant decompressed by the pressure reducing device.
[0011]
Further, the compressor is driven by the driving force of the engine. The power transmission from the engine to the compressor is interrupted by a known electromagnetic clutch (not shown).
On the downstream side of the evaporator 4, a heater core 5 that uses engine coolant of a vehicle (not shown) as a heat source is disposed in a part of the flow path in the air conditioning case. Thereby, the flow path in the air conditioning case 2 on the downstream side of the evaporator 4 is provided with a bypass passage 6 through which the blown air that has passed through the evaporator 4 bypasses the heater core 5. The heater core 5 is provided in an engine coolant circuit (not shown).
[0012]
Then, between the evaporator 4 and the heater core 5, the temperature of the conditioned air is adjusted by adjusting the amount of air passing through the bypass passage 6 and the amount of air passing through the heater core 5 among the blown air that has passed through the evaporator 4. An air mix door 7 is provided. The air mix door 7 is driven by a servo motor 26 as drive means.
[0013]
1, the air conditioning case 2 on the air downstream side of the heater core 5 is provided with a well-known face air passage 20, a foot air passage 22, and a defroster air passage 21 provided in the vehicle interior. And these air passages are provided with outlet switching doors 23 and 24. These air outlet switching doors 23 and 24 are driven by servo motors 27 and 28 as driving means.
[0014]
As a result, the well-known face mode, bi-level mode, foot mode, foot diff mode, and defroster mode can be switched as the blowing mode.
Such a vehicle air conditioner 1 is automatically controlled by the control device 11 shown in FIG. 2, the inside / outside air mode, the blowout mode, the amount of air blown from the blower 3 (voltage applied to the drive motor 3 a), the air mix door 7. The operation position (opening) is automatically controlled.
[0015]
Hereinafter, the control device 11 will be described. The control device 11 is a well-known electronic control device, and includes a RAM that temporarily stores data, a ROM that stores an air conditioning control program, a CPU that performs arithmetic processing based on data stored in the RAM, and the like. Is.
The control device 11 has, as input terminals, an outside air temperature sensor 12 that is a means for detecting an outside air temperature (hereinafter referred to as an outside air temperature), an inside air temperature sensor 13 that is a means for detecting the temperature in the vehicle interior, and the amount of solar radiation that enters the vehicle interior. A solar radiation sensor 14 as a means for detecting, a post-cooling temperature sensor 15 as a means for detecting a temperature immediately after passing through the evaporator 4, and a cooling water temperature sensor 16 as a means for detecting the cooling water temperature of the engine flowing into the heater core 4. It is connected. Further, the water temperature sensor 16 detects a cooling water temperature in an engine cooling water circuit (not shown) where the heater core 5 described above is disposed.
[0016]
The control device 11 is connected to an air conditioning operation panel 17 installed in the vehicle interior as an input terminal. The air conditioning operation panel 17 automatically has a temperature setting device 17a for setting a set temperature in the vehicle interior and an air conditioning device. An auto switch 17b for controlling the air conditioner and an off switch 17c for stopping the operation of the air conditioner are provided.
On the other hand, the control device 11 drives the drive motor 3a of the blower 3, the servo motor 25 that drives the inside / outside air switching door 10, the servo motor 26 that drives the air mix door 7, and the outlet switching doors 23 and 24 as output terminals. Servo motors 27, 28, etc. are connected.
[0017]
Then, when the auto switch 17b is turned on, the control device 11 determines the inside / outside air mode, the opening degree of the air mix door 7, and the blowout according to the air conditioning load based on the input signal from the input terminal. The air conditioning mode is automatically controlled. The detected value of the water temperature sensor 16 is used when the opening degree of the air mix door 7 is determined. Further, the post-cooling temperature sensor 15 stops the compressor when the detected value is lower than 3 ° C. to prevent the evaporator 4 from being frosted, and operates the compressor when the detected value is higher than 4 ° C. Used to make.
[0018]
The control device 11 is connected to an ignition switch 29 for starting the vehicle engine. When the ignition switch 29 is turned on, power is supplied. The control device 11 temporarily stores an input signal from the input terminal as data in the RAM, calculates this data by the CPU, and executes the air conditioning control program in the ROM.
[0019]
Even if the ignition switch 29 is turned off, the control device 11 backs up and stores the outside air temperature detected by the outside air temperature sensor 12 immediately before turning off the ignition switch 29, that is, immediately before stopping the engine (generally, storage means) Backup memory function).
FIG. 2 shows a flowchart of the outside air temperature detection control in this embodiment. This flowchart is executed when the ignition switch 29 is turned on.
[0020]
First, the ignition switch is turned on, and the flag F is set to 0 at the start. In step S1, the detected temperature TAM of the outside air temperature sensor 12, the detected temperature TR of the inside air temperature sensor 13, the detected temperature TW of the water temperature sensor 14, etc. at this time (when the engine is started) are read and stored.
Next, in step S2, it is determined whether or not 0 is set in the flag F. That is, in step S2, it is determined whether or not the ignition switch 29 is turned on (immediately after the engine is started, the vehicle has been stopped until then). If it is immediately after the ignition switch is turned on, the process proceeds to step S3.
[0021]
In addition, after the ignition switch 29 is turned on, once exiting this flowchart and proceeding again to step S2, the determination result in step S2 is NO, and the routine proceeds to step S9.
In step S3, it is determined whether or not the detected temperature TR of the inside air temperature sensor 13 is higher than a predetermined value (50 ° C. in the present embodiment). That is, for example, when the vehicle is parked under hot weather, the temperature in the vehicle interior rises due to the influence of solar radiation, and the inside air temperature sensor 13 may detect a temperature of 50 ° C. or higher. If the determination result in step S3 is YES, the process proceeds to step S4. If the determination result is NO, the process proceeds to step S5.
[0022]
In step S4, a predetermined value T1 to be compared with a detected temperature TW of the water temperature sensor 14 is set to a first predetermined value (60 ° C. in the present embodiment) as a threshold value in step S6 described later. On the other hand, in step S5, the threshold value in step S6, which will be described later, is set to a second predetermined value (50 ° C. in the present embodiment) that is lower than the first predetermined value. Set. That is, in steps 3 to 5, the predetermined value T1 is set higher as the detected temperature TR of the internal air temperature sensor 13 becomes higher.
[0023]
Subsequently, the process proceeds to step S6, and it is determined whether or not the detected temperature TW of the water temperature sensor 14 is higher than T1 set in step S4 or 5. If the determination result in step S6 is YES, the process proceeds to step S7, immediately after the ignition switch 29 is turned on, and before the ignition switch 29 is turned on with the first outside air temperature control data as ATAM. Thus, the detected temperature CTAM of the outside air temperature sensor 12 read and backed up immediately before the engine is stopped is used.
[0024]
On the other hand, in step S8, immediately after the ignition switch 29 is turned on, the outside air temperature TAM read in step S1 is used as it is as outside air temperature control data TAM.
Hereinafter, the operation from step S3 to step S8 will be described. First, in the above-described conventional apparatus, the predetermined value T1 is always set to be constant. Therefore, when the vehicle is parked under hot weather, the engine cooling water temperature rises (does not decrease) due to the influence of solar radiation. When the ignition switch 29 is turned on, the outside air temperature CTAM detected by the outside air temperature sensor 12 immediately before the engine is stopped is used as control data.
[0025]
Thereby, in the said conventional apparatus, since engine cooling water rises by solar radiation as mentioned above, this control data and the actual outside temperature largely shift | deviate.
Therefore, in this embodiment, when the detected temperature TR of the inside air temperature sensor 13 is used and the detected temperature TR of the inside air temperature sensor 13 is higher than 50 ° C., it is considered that the vehicle is parked under the hot sun, and a predetermined value T1 is set in step S4. Is set to a higher 60 ° C. On the other hand, when the detected temperature TR of the inside air temperature sensor 13 is lower than 50 ° C., it is considered that the vehicle is not parked under the hot sun, and the predetermined value T1 is set to a lower 50 ° C. in step S4.
[0026]
Thus, in the present embodiment, when the engine coolant temperature Tw rises (when it does not decrease) due to the influence of solar radiation, it is noted that the temperature TR in the vehicle interior also increases due to solar radiation. Since the predetermined value is set higher as the temperature of the engine increases, the outside air temperature CTAM immediately before the engine stops without being affected by solar radiation at the time of engine start, and the outside air temperature TAM actually detected by the outside air temperature sensor 12 at the time of engine start. Can be selected as control data in a timely manner. As a result, when the engine is started, the vehicle air conditioner 1 can be controlled with high accuracy.
[0027]
Then, the process proceeds to step S12, where 1 is set in the flag F, once exits this flowchart, and again proceeds to step S2. Then, it determines with NO at step S2, and progresses to step S9-11.
In steps S9 to S11, after delay correction for delaying the rise in the detected temperature TAM of the outside air temperature sensor 12, and after CTAM is used as the control data ATAM in step S7, the control data ATAM is actually used as the outside air temperature sensor 12. Is corrected so as to approach the outside air temperature TAM detected by.
[0028]
Hereinafter, the case where TAM was used for the control data ATAM in the previous step S8 will be described first.
In this case, in step S9, it is determined whether or not the control data ATAM used last time is higher than the outside air temperature TAM detected by the outside air temperature sensor 12 this time.
Accordingly, when the previous control data ATAM is lower than the current outside air temperature TAM, the process proceeds to step S11 and the current outside air temperature TAM is used as the latest control data BTAM.
[0029]
As an example of such a case (1), when the engine is started and the vehicle is stopped, the outside air temperature sensor 12 has a temperature higher than the actual outside air temperature due to the influence of heat in the engine room. It may be detected. After that, when the vehicle travels, the outside air temperature detected by the outside air temperature sensor 12 may be lowered due to the traveling wind hitting the outside air temperature sensor 12.
[0030]
Further, in step S9, when the control data ATAM used last time becomes higher than the current outside air temperature TAM, the process proceeds to step S10 and delay correction is performed. In addition, when the control data ATAM used last time is higher than the current outside air temperature TAM in the example (2), after the engine is started, it receives a slight amount of engine heat. This is when the detected temperature TAM of the outside air temperature sensor 12 rises in a short period of time. The cause of the increase in the detected temperature TAM of the outside air temperature sensor 12 in such a short time is often due to engine heat as described above. In this case, the detected temperature TAM of the outside air temperature sensor 12 is the actual outside air temperature. It will shift with respect to.
[0031]
Therefore, in step S10, by delaying the rise in the detected temperature TAM of the outside air temperature sensor 12 in this way, a value as close to the actual outside air temperature as possible is used as the control data ATAM.
Specifically, in this embodiment, when the detected temperature TAM of the outside air temperature sensor 12 rises by a predetermined value or more per unit time while the vehicle is stopped (for example, it can be known by the vehicle speed), the temperature rise is increased per unit time. Is corrected to ΔT smaller than the predetermined value. For example, when the detected temperature TAM of the outside air temperature sensor 12 rises by 2 ° C. or more per minute, it is increased only by ΔT (0.2 ° C.) per minute.
[0032]
Therefore, in step S11, when the above-mentioned temperature rise is higher than 2 ° C., the latest control data BTAM is obtained by adding ΔT to the previous control data ATAM as shown in FIG. On the other hand, when the increase in temperature detected by the outside air temperature sensor 12 is smaller than 2 ° C., the previous control data ATAM is used as the latest control data BTAM.
[0033]
Next, the case where CTAM was used for the control data ATAM in the previous step S7 will be described.
In this case, in step S9, the control data ATAM (CTAM) used last time is stored just before the engine is stopped and may be different from the actual outside air temperature when the engine is restarted. Therefore, in steps S9 to S11, the control data is gradually brought closer to the actual outside air temperature.
[0034]
That is, in step S9, it is determined whether or not the previous control data ATAM (CTAM) is higher than the outside air temperature TAM detected by the outside air temperature sensor 12 this time.
If the previous control data ATAM (CTAM) is lower than the current outside air temperature TAM, the process proceeds to step S11, and the current outside air temperature TAM is used as the latest control data BTAM. An example in which such a thing occurs is the same as (1) described above.
[0035]
In step S9, if the control data ATAM (CTAM) used last time becomes higher than the current outside air temperature TAM, the process proceeds to step S10 and the above-described delay correction is performed. In this case, in addition to the above (2), since the previous control data ATAM (CTAM) may be actually lower than the actual outside air temperature, the above-described delay correction is performed. As a result, every time the process proceeds to steps 1, 2, 9, and 10, the traveling wind from the vehicle travels against the outside air temperature sensor 12, and the latest control data ATAM approaches the actual outside air temperature.
[0036]
(Other embodiments)
In the above embodiment, the predetermined value T1 is set higher as the detected temperature TR of the inner air temperature sensor 12 becomes higher. However, the after-cooling temperature sensor 15 may be used instead of the inner air temperature sensor 12. That is, when the vehicle is parked under hot weather, not only the detected temperature TR of the internal air temperature sensor 12 but also the detected temperature Te of the temperature sensor 15 after cooling rises due to solar radiation.
[0037]
In the above embodiment, the predetermined value T1 is set in two stages according to the detected temperature TR of the internal air temperature sensor 12. However, as shown in FIG. 3, the predetermined value T1 is set linearly according to the detected temperature TR. Also good.
In the above embodiment, the outside air temperature TAM detected by the outside air temperature sensor 12 is used as control data for the vehicle air conditioner 1. However, the present embodiment is not limited to this, and the outside air temperature is detected and controlled. Any data can be used as long as it is used as business data.
[0038]
Further, in the above embodiment, the water temperature sensor 16 is attached so as to be in contact with the outer surface of the heater core 5 as shown in FIG. 1, but the cooling water temperature detecting means referred to in the present invention is located anywhere in the engine cooling water circuit. It may be attached to.
[Brief description of the drawings]
FIG. 1 is an overall configuration diagram of an air conditioner according to an embodiment of the present invention.
FIG. 2 is a diagram showing a flowchart in the embodiment.
FIG. 3 is a relationship diagram showing a relationship between an internal air temperature TR and a predetermined value T1 in another embodiment of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Control apparatus, 12 ... Outside temperature sensor, 14 ... Water temperature sensor 15 ... Temperature sensor after cooling

Claims (4)

Outside air temperature detecting means (12) for detecting the outside air temperature (TAM), cooling water temperature detecting means (16) for detecting the cooling water temperature of the engine of the vehicle, and the outside air temperature detecting means (12) immediately before stopping the engine. Storage means (11) for storing the outside air temperature (CTAM) detected by
When the cooling water temperature (Tw) detected by the cooling water temperature detection means (16) at the time of starting the engine is higher than a predetermined value (T1), the outside air stored in the storage means (11) for a predetermined time. An outside air temperature detecting device for a vehicle configured to set temperature (CTAM) as control data (ATAM),
Temperature detecting means (13, 15) capable of detecting the temperature (TR, Te) of the vehicle interior of the vehicle at the time of starting the engine;
The vehicle outside temperature detecting device, wherein the predetermined value (T1) is set higher as the temperature in the vehicle compartment detected by the temperature detecting means (13, 15) at the time of starting the engine becomes higher. The vehicle outside air temperature detection device according to claim 1, wherein the control data (ATAM) is used for air conditioning control of a vehicle air conditioner (1) for air conditioning the vehicle interior. The vehicle outside air temperature detecting device according to claim 1 or 2, wherein the temperature detecting means (13) is an inside air temperature sensor (13) that is provided in a vehicle interior and detects a temperature in the vehicle interior. A cooling heat exchanger (4) for cooling the air passing therethrough is disposed in the air conditioning case (2) of the vehicle air conditioner (1),
The vehicle outside air temperature according to claim 2, wherein the temperature detecting means (15) is a post-cooling temperature sensor (15) for detecting a temperature immediately after passing through the cooling heat exchanger (4). Detection device.

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