JPH01273713A - Outside air temperature detecting device for automobile - Google Patents

Abstract

PURPOSE:To prevent an outside air temperature from its misdetection by inhibiting an outside air temperature value from its output in case of a detected engine temperature being not less than the predetermined value when an engine is started. CONSTITUTION:Being based on a signal detected by a temperature sensor M1, an outside air temperature detecting means M2 detects an outside air temperature to be output. While an engine temperature detecting means M3 detects a temperature of an engine E/G to be output to an output action inhibiting means M4. When the engine E/G is in starting and when the detected engine temperature is not less than the predetermined reference value, an inhibition signal is output to the outside air temperature detecting means M2 so that it outputs no outside air temperature detection value for the predetermined time. In this way, the outside air temperature, receiving an influence by heat emitted from the engine E/G when it is started, is prevented from misdetection, and accuracy can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention is directed to an outside air temperature detection device for an automobile that detects the outside air temperature using a temperature sensor attached to the outside of the vehicle.

[Conventional technique 1; i] Conventionally, when controlling air conditioning or displaying outside temperature in a car, a temperature sensor installed outside the vehicle → 1 (hereinafter referred to as
Also called an outside temperature sensor. ) An outside temperature detection device is used that detects the outside temperature based on the output No. 3 from the air conditioner.

In addition, the outside temperature sensor must be installed in a position where it can accurately detect the outside temperature without being affected by heat generated from the vehicle drive system such as the engine or direct sunlight. It is installed in the radiator grill or in the bumper at the rear of the vehicle away from the engine.

[Problems to be Solved by the Invention] As described above, the outside air temperature sensor 4f is installed in a position where it is not affected as much as possible by light and radiant heat from the vehicle drive system, so when the vehicle is operating, the outside air temperature sensor 4f is The outside temperature can be accurately determined by the output signal.

However, if you start the engine again and drive the vehicle within a short time after parking the vehicle, the output signal from the outside temperature sensor will be higher than the actual outside temperature, and the There was a problem that the outside temperature could not be detected accurately for a while. In other words, immediately after the vehicle is parked, the engine cooling operation by the cooling fan etc. also stops as the engine stops, so the engine temperature drops to 11j7.
However, when the vehicle is parked, it is difficult for fresh outside air to flow around the outside temperature sensor, and outside air warmed by the radiant heat from the engine circulates around the outside temperature sensor. When the engine is restarted after , it becomes impossible to detect the outside temperature at a positive value (iα) based on the output signal from the outside temperature sensor.

Therefore, the present invention has been developed to prevent the outside temperature sensor from detecting the outside temperature when the vehicle is restarted for a short time after the vehicle is parked. The purpose was to provide an outside temperature detection device.

[Means for Solving the Problems] In other words, the present invention, which has been made to achieve the above object, comprises: a temperature sensor M1 installed at a position capable of detecting outside air temperature; an outside temperature detection means M2 that detects the outside temperature based on an output signal of; M3, and at the time of starting the engine E/G, it is determined whether the engine temperature outputted by the engine temperature detecting means M3 is equal to or higher than a predetermined reference temperature, and if the engine temperature is equal to or higher than the reference temperature, The gist of the present invention is an outside temperature detection device for an automobile, characterized in that an output operation prohibition means M4 for inhibiting the output of the outside temperature detection f+H by the outside temperature detection means M2 for a predetermined period of time is provided.

[Function] In the outside air temperature detection device for an automobile of the present invention configured as described above, when the engine temperature detected by the engine temperature detection means M3 at the time of starting the vehicle becomes equal to or higher than the reference temperature, the output operation prohibition means M4 is set to a predetermined level. The output operation of the outside temperature detection value based on the output signal from the temperature sensor Ml by the outside temperature detection means M2 is prohibited. Therefore, the parking time before starting the vehicle is short, and the temperature sensor M
The output signal from 1 no longer corresponds to the outside temperature.
It is possible to prevent detection of the outside temperature when

[Example] Embodiments of the present invention will be described below with reference to the drawings.

First, FIG. 2 is a schematic configuration diagram showing the entire configuration of an air conditioner for an automobile to which the present invention is applied.

As shown in the figure, this automotive air conditioner (hereinafter simply referred to as an air conditioner) is one in which a so-called air conditioning unit is provided in the front compartment 1 (ventilation duct placed in the ventilation duct) 2. An air mix damper 5c includes, in order from the intake port side, an internal/external air tJ]+9 damper: which determines whether to circulate internal air or introduce external air; An air mix section 5 is provided which determines the temperature of the air blown out depending on the opening degree of the air mixer. In addition, at the location where hot air or cold air is blown from the ventilation duct 2 to the passenger compartment 1, there is an air outlet LJJ conversion damper that converts the blown air into the defroster air outlet 1a and the vent air outlet 11) or the heat-9 air outlet 1c. 6 and a vent/heater L nozuki damper 7 that roughly replaces the vent outlet 111 and the heater outlet 1c are attached.

These internal/external air switching dampers 3. Blower 4. air mix a
The l5H outlet switching damper 6 and the vent/heater switching damper 7 are connected to an actuator 8 for switching inside and outside air, respectively. Blower motor9. Near mix section side + Jj section 10. Blowout switching actuator 11 and vent φ heater t-J
J' is driven by the replacement actuator 12).

In addition, the air mixer drive ire<1o is connected to the compressor lOa connected to the evaporator 5a and the heater
The water valve 10b provided in the pipe that circulates the engine E/G cooling water to the taco core 5b and the water valve Sob are opened and closed to reduce the heating of the heater.
A water valve drive unit 10c that increases or decreases the number of deer, and a valve drive unit 10r that adjusts the opening degree of the air mix damper 5c.
l and (1; mu).

Each of these seven blowers and drive units is connected to an electronic control device 20, and upon receiving control commands from the electronic Jf311 device 20, the air mix unit 5 adjusts the blowing air temperature TAO, and the blower motor 9 adjusts the blowing air temperature TAO. Air ff1Q
, the actuator 11 using the outlet cutter 1 and the vent
The heating/dark switching actuator 12 adjusts and sets the blowing mode.

The electronic I11 control device ζ20 that issues these control commands is a well-known CPU21. ROM22. RAM23 with uneven backup. 7I centered on timer 25
It is configured as an Il logical operation circuit, and is connected to each actuator via the output cabinet 26! (Outputs I8 motion signal.

In addition, the human output boat 26 includes a room temperature sensor 031 that detects the temperature (room temperature) inside the vehicle compartment 1 via the A/D converter 30;
An outside temperature sensor 33 as a temperature sensor M1 that detects outside air temperature, and a water temperature sensor (
)° 35, an evaporator outlet temperature sensor 37 that detects the temperature of cold air from the evaporator 5a, an opening sensor 39 that detects the opening of the air mix damper 5c, etc. are connected, and various necessary for executing air conditioning control are connected. The data can be detected via the sensor. The air temperature sensor 4j-33 is provided in the radiator grille, which serves as the outside air inlet of the radiator, at both front ends so that outside air can easily flow around the sensor 14 during vehicle operation.

Furthermore, an operation panel 50 is also connected to the human output water cart 26 for issuing operational commands for the device. The operation panel 50 is provided on the inner panel in front of the driver's seat.
As shown in the figure, an IR selection switch 50a for selecting whether to operate the device automatically or manually;
An off switch 50t for instructing the device to stop operating, a command switch 50c for instructing the operation of the refrigeration cycle, and a selection switch 5-Od for selecting internal air circulation or outside air introduction.
, up/down switches 50c and 50f for setting the target temperature inside the vehicle, a display 50g for displaying the set target temperature or outside temperature, a display command switch 5011 for commanding the display g to display the outside air temperature, Select the air flow rate from blower 4 as strong, medium, or weak with J switch 50.
i+ 50j+ 50k, a selection switch for selecting an air outlet, switches 50Q, 50m, 50n, 50o, etc. are provided.

The display device 50g is composed of an LED, a fluorescent display tube, a liquid crystal display, etc., and normally displays the target temperature set by the a-tub down switches 50C and 50f, as shown in FIG. Display command switch 50
Only when an outside temperature display command is issued via h.
- Temporarily displays the outside temperature as shown in FIG. 11(1)).

In the air conditioner of this embodiment configured as described above, the electronic control device 20 drives and controls the various actuators described in "2" in response to operation commands issued via the operation panel 50, and blows air into the vehicle interior 1. Air temperature control, outlet LJ
I conversion control, various well-known skies, J! The outside temperature detection process, which is the main process related to the present invention and is executed by the electronic control unit 20, will be executed in accordance with the flowchart shown in FIG. In addition, Fig. 5 shows that during the operation of the engine E/G, the electronic
2 shows a portion of the main routine that is repeatedly executed by the I/control device 20 and relates to the fresh air center 11.1.

As shown in the figure, when the engine E/G is started, the electronic control unit 20 first executes periodization processing in step 1oo. In this step 1oo, past outside temperature data 'I'am(n-1) is used for outside temperature detection processing to be described later.
How do I set the outside temperature data 'ram' before stopping the engine?
to write. Further, once the process of turning the STEP LOOT into a month is executed, the program moves to the next STEP 110, starts the timer 25, and starts measuring the elapsed time after starting the ENOGENE E/G. Then, in the following station tube 120, based on the output signal from each sensor 1t, the outside air? i! i'
A M, Engine IE/G) 0 Cooling water temperature TI (W, etc.) 1. Read various output data, ・Execute the detection data reading process.

When the detection data reading process is executed in this way,
Next, the process moves to step 130ζ to execute outside temperature detection processing.

In this outside temperature detection process, first in step 131, the time measured by the timer 25 exceeds a predetermined time (for example, 5 minutes).
[Determine whether a predetermined time has elapsed after starting the re-engine E/G ■11, Predetermined time elapsed []
If it is determined that there is not, the process moves to the next step 132.

In step 132, a predetermined temperature α (for example, 10°) is added to the external temperature data 1'a+n' when the engine E/G was stopped last time (14t is set as the reference temperature, and the engine E/G read in step 120 is added. Cooling water of G>m
It is determined whether T HW is equal to or higher than the reference temperature. And engine E/G coolant temperature 'l' t
-IW is the standard? If the temperature is above W degree ('l'an+'+α), the parking time until the engine starts will be shortened.
Outside temperature sensor 33 t': I l engine E/G
It is determined that outside air warmed by 1' is circulating in the temperature range of 1', and the process moves to step 133, and the engine is stopped as the outside temperature data is set to 1'am(n). Set the outside temperature data 'l'am' before L, and step 1; 34
to move to.

On the other hand, if it is determined in step 131 that a predetermined period of time has elapsed since the engine was started, or if it is determined in step 132 that the engine cooling water temperature T
ram'+α) or higher, the system shifts to Ste/Tub 135, and the new outside air? The outside temperature detection data 'I' AM read in step 120 is set as 1,1 data 'r' a+n(n), and the process moves to step 134.

Then, in step 13/1, -1- step 133
Or the outside temperature/data 1'a set in step 135
m(n) and past outside temperature data T” am(n −1
), the outside temperature data T am (n) used for air conditioning: 1-control and outside temperature display is calculated using the following equation (1), and T
am(n)=T am(n)/rn+(m
-1) 4Ta+++(n-1)/rn =-(1)
Proceeding to step 13G, after setting the calculated outside temperature data Tam(n) as the past outside temperature data Tam(n-1) for the next process, the outside temperature detection process is performed. end.

Then, perform this outside temperature detection process in 1. /2, Step 1 '; IM + knowledge air conditioning 11J fffll and display of outside temperature using outside temperature data Tam(n) obtained in 34)
The outside temperature display control based on the command is executed, and the process returns to step 120.

As mentioned above, the outside temperature (■ This implementation 1f where ratio processing is executed)
In f, it is determined whether or not the engine E/G cooling water temperature 1'LIW is equal to or higher than the reference temperature ('1''1'+α) until a predetermined time has elapsed after the start of the vehicle ΦJJ,
If the engine coolant temperature 'l'' If W ) r < the standard temperature J-, set the outside air temperature data 'I' old ■' at the time of the engine stop as the outside air temperature data T am (n) at the most Yji. Then, the outside temperature data 'l' am (n)r! is updated based on this set outside temperature data 'r'am (n). Therefore, when the engine is started, the engine temperature is high and the output from the outside temperature sensor 33 is Detection data obtained based on signal ζ'
When I' A M is larger than the actual outside temperature (that is, when the parking time is short), the outside temperature data Tam(n) used for air conditioning control and outside temperature display for a predetermined period of time is
outside temperature data before engine stop as i” a+n
' is set as is, and the outside temperature sensor 33
This makes it possible to prevent erroneous detection of outside temperature due to

On the other hand, the engine giant / GWi! Open at the specified time after r'JJ, or the engine E/G cooling water temperature 'rHW is 7.
1-2-t': When the temperature is not higher than (Tam'+α), the product is t! The detection data 'rAM obtained based on the output signal from the outdoor temperature sensor; a+n(u-1) (Iff is the outside temperature data used for air conditioning control and outside temperature display 'l”am(n
).

1.!Data T
” a + n (n) does not change suddenly, is it outside air?
1! (■ Output accuracy can be improved.

In the Naoki practical example, step 120. Step 13
5 and the processing of step 13/1 causes the outside temperature detection stage M2 to detect water? ! 12 sensor 3:] indicates the engine temperature (■output means M3, step 131 to step I3;
The series of processes corresponds to output operation prohibition 11-means MII, respectively.

Here, in the above embodiment, the engine temperature is the cooling water temperature'
Although the configuration is configured to detect I'f-IW, a configuration may also be adopted in which a temperature sensor is provided in the cylinder head of the engine to detect the engine temperature.

In the second embodiment, Kf, which is obtained by adding a predetermined temperature α to the outside temperature data Tan' before the engine is stopped, is used as a reference temperature to determine whether there is an abnormality in the output from the outside temperature sensor 3:3. But outside air) 11! Sen1 Nonie 333
The engine temperature (
In the above example, the cooling temperature (0) is determined in advance by experiment, and this is used as the reference temperature for the outside air temperature. 1 Shisen 1 No: 3 Knee 3 to judge the output abnormality, or outside air at startup? L! -4ω obtained by the output signal from the sensor 33
Determine whether there is an abnormality in the output from the outside air temperature sensor 33 using IIQ, which is the output data 'rAM plus a predetermined temperature, as a reference temperature tl'J'
r.

Further, in the above embodiment, the outside temperature sensor 33 was explained as being installed in the radiator grille at the front of the vehicle, but the outside temperature sensor's lead 14 is connected to the vehicle drive system such as the engine when the vehicle is running. It may be mounted anywhere as long as it is not affected by the heat of the vehicle, and may be mounted on the rear bumper of the vehicle or the like.

[Effects of the Invention] As detailed above, according to the outside temperature detection device for a vehicle of the present invention, when the engine temperature at the time of starting the engine is equal to or higher than the reference temperature and the parking time before starting the engine is short,
Since the output operation of the outside temperature detection value based on the output signal from the temperature sensor is prohibited, the outside air is heated by the QJ heat released from the engine when the engine is started. 1! Even if the temperature sensor gets around the outside temperature sensor, it will not reveal the outside temperature and will improve the outside temperature detection accuracy.
-I can.

[Brief explanation of the drawing]

Figure 1 is a schematic diagram showing the configuration of the present invention, and Figure 2 is a diagram showing the overall configuration of the air conditioner according to the embodiment.
- Approximately ll8 configuration diagram, Figure 3 is an explanatory diagram showing the configuration of the operation panel, Figure 4 is an explanatory diagram showing the temperature display state of the display provided on the operation panel, and Figure 5 is an explanatory diagram showing the temperature display state of the display provided on the operation panel. Outside air? 1. ! This is a graph representing the detection process. Ml...Temperature sensor M2...Outside temperature detection means M
3...Engine temperature detection means M/l...Output operation prohibition means E/G...Engine 20...Electronic control device 33...Outside temperature sensor 4J:15...Water temperature sensor 39...・Rotation speed sensor agent: Patent attorney Tsutomu Adachi (or 2 people)
Figure 1

Claims (1)

[Claims] An outside temperature detection for an automatic motor vehicle, comprising: a temperature sensor installed at a position capable of detecting outside air temperature; and outside temperature detection means for detecting outside air temperature based on an output signal from the temperature sensor. The apparatus includes an engine temperature detection means for detecting the temperature of an engine mounted on a vehicle; and a device for determining whether or not the engine temperature detected by the engine temperature detection means is equal to or higher than a predetermined reference temperature when the engine is started; An outside temperature detection device for an automobile, comprising: output operation prohibiting means for prohibiting the outside temperature detection means from outputting a detected value of outside temperature for a predetermined period of time when the engine temperature is equal to or higher than a reference temperature.