JP3116351B2 - Outside temperature detection display for automobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an outside air temperature detection and display device using a detection signal from an outside air temperature sensor used for automatic control of, for example, an air conditioner installed in an engine room of an automobile.

[0002]

2. Description of the Related Art In general, an automobile is equipped with an air conditioner for air-conditioning the interior of the automobile to a comfortable temperature, and it is necessary to perform frequent manual adjustments by the driver regardless of the so-called outside temperature outside the automobile. There is an automatic air conditioner that automatically controls the air conditioning without using it.

[0003] Such an automatic air conditioner detects the outside air temperature and controls the strength of the air conditioning according to the detected temperature. The outside air temperature sensor avoids the direct heat of the sun and detects the temperature faithful to the outside temperature of the vehicle. Because of the necessity of detection, it is generally installed in a place where outside air easily enters in the engine room.

[0004] In recent years, as vehicles suitable for leisure, called recreational vehicles, have become widespread, there has been an increasing demand to know the temperature outside the vehicle when performing activities in leisure areas such as mountainous areas. There is a demand that the frozen state of the road surface such as the morning of the morning in a cold region be ascertained based on the temperature, and an outside air temperature display device that can know such an outside air temperature in an automobile is required.

In such an outside air temperature display device, it is necessary to detect the outside air temperature by using an outside air temperature sensor. We must respond by setting up.

[0006]

However, the outside air temperature sensor installed in the engine room (in front of the radiator) is particularly effective when the engine is running but the vehicle is not running and the vehicle is in a stopped state. The wind disappears and is easily affected by the warm temperature of the engine.

Therefore, even though the outside air temperature is low, the temperature detected by the outside air temperature sensor becomes high due to the heat in the engine room, and is displayed based on the outside air temperature data detected under such influence. The temperature also becomes a high temperature that is completely different from the actual outside temperature.

Such a temperature error may be large depending on the running condition of the vehicle, particularly when the vehicle is stopped and idling, or when the vehicle starts running before the engine is sufficiently cooled down by a short stop. ,
A problem arises in that the temperature inside the engine room rises and affects the outside temperature sensor, so that a correct outside temperature cannot be obtained.

The present invention solves such a problem.
It is an object of the present invention to provide a vehicle outside temperature detection display device that stores outside temperature data from an outside temperature sensor in a storage unit, and that enables more accurate outside temperature display under conditions of traveling speed and time. .

[0010]

According to the present invention, there is provided a data holding means for storing outside air temperature data detected by an outside air temperature sensor disposed in an engine room of an automobile by turning off a start key of the automobile, A control unit that inputs the temperature detected by the outside air temperature sensor and outputs it as outside air temperature data after predetermined processing, an outside air temperature display unit that displays the temperature as the outside air temperature based on the outside air temperature data output from the control unit,
The control unit reads the outside air temperature data stored in the data holding unit by turning on a start key of a vehicle, and the read outside air temperature data is larger than the outside air temperature data detected by the outside air temperature sensor. When it is determined that the traveling speed detected by the traveling speed sensor is equal to or higher than the predetermined speed and continues for a predetermined time or longer, the data
External temperature data from the external temperature sensor
When gradually approaching the outside air temperature data and determining that the traveling speed is equal to or higher than the predetermined value and does not continue for the predetermined time or longer, it is determined whether or not the outside air temperature sensor has become unaffected by the warm air temperature of the engine. If it is determined that the outside air temperature has not been received, the outside air temperature is controlled to be displayed based on the outside air temperature data detected by the outside air temperature sensor.

[0011] The controller may be configured to perform a predetermined time period when the outside air temperature data stored in the data holding means read by turning on a start key of the vehicle is smaller than the outside air temperature data detected by the outside air temperature sensor. and displaying updated on the outside air temperature data from the outdoor temperature sensor in a cycle.

The control unit measures the elapsed time from when the start key is turned off to when it is turned on. When the elapsed time is a predetermined value or more, the outside temperature sensor is not affected by the warm temperature of the engine. It is characterized in that it is determined that the state has been reached.

The control section inputs water temperature data detected by a cooling water temperature sensor of the vehicle. When the water temperature data is equal to or less than a predetermined value, the external temperature sensor is not affected by the warm air temperature of the engine. Is determined.

After a predetermined time has passed since the start key was turned on, the control unit displays the outside air temperature on the outside air temperature display unit, and blanks the outside air temperature display unit for a predetermined time until the outside air temperature display. Alternatively, a standby display in a predetermined display shape is provided.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A start key 1 is used when a vehicle stops running.
By turning off the (ignition key), the outside temperature data detected by the outside temperature sensor 2 installed in the engine room is stored in the data holding unit 3 and based on the outside temperature data output from the control unit 4. The outside temperature is displayed on the outside temperature display section 5. The control unit 4 reads the outside temperature data C0 stored in the data holding means 3 by turning on the start key 1 of the vehicle, and reads the read outside temperature data C0 from the outside temperature data CN detected by the outside temperature sensor 2. When it is determined that the traveling speed V detected by the traveling speed sensor 6 is equal to or higher than the predetermined speed V0 and continues for the predetermined time T0 or longer, the external temperature data CN from the external temperature sensor 2 is stored. When it is determined that the traveling speed is not less than the predetermined value and does not continue for more than the predetermined time while gradually approaching the outside air temperature data C0 of the means 3, it is determined whether the outside air temperature sensor 2 is not affected by the warm air temperature of the engine. In order to determine whether the start key 1 has been turned on, the control unit 4 measures the elapsed time t from the ON operation of the start key 1. If the elapsed time is equal to or greater than the predetermined value t0, it is determined that the temperature in the engine room has sufficiently coincided with the outside air temperature and the outside air temperature sensor 2 can detect the correct outside air temperature. Is controlled to display the outside air temperature based on the outside air temperature data CN.

[0016]

FIG. 1 is a circuit diagram showing an embodiment of the present invention. The present invention will be described in detail with reference to the operation flow diagram shown in FIG.

In FIG. 1, a start key 1 is an accessory switch for an automobile and a switch (ignition key) for starting an engine, and supplies power to electrical components.

When the automobile is running, and when the automobile is stopped when returning home or the like and the start key 1 is turned off, the external temperature data CN detected by the external temperature sensor 2 installed in the engine room is stored in data holding means. 3 is stored.

Assuming that the outside air temperature data at this time is C0, the control unit 4 detects that the start switch 1 for stopping the engine has been turned off from the state in which the vehicle has been running, and stores the outside air temperature data C0 in the data holding unit 3. To memorize.

If this off operation is performed after returning home, a sufficient time elapses until the next morning, so that the temperature in the engine room also becomes a temperature corresponding to the outside air temperature. When the switch 1 is turned on, the control unit 4 first reads the outside air temperature data C0 stored in the data storage unit 3.

The outside air temperature data C0 is a detection output of the outside air temperature sensor 2 immediately after the vehicle has traveled, and is affected by the heat of the engine, that is, in a state in a temperature environment sufficiently faithful to the outside air temperature due to the running wind. Since the outside air temperature is in a state where no outside air temperature is present, if the temperature is displayed on the outside air temperature display unit 5 based on the outside air temperature data C0, although it is different from the faithful outside air temperature detected by the outside air temperature sensor 2 at the present time, Without displaying a high temperature far from the outside temperature affected by the heat of the engine, it is possible to display in a temperature range that the driver can feel as the outside temperature.

Thereafter, the control unit 4 fetches the outside temperature data CN at that time detected by the outside temperature sensor 2, and
The display value at that time is compared with the determined outside air temperature data C0, and when the outside air temperature data C0 which is the display value <detected outside air temperature data CN, that is, when the outside air temperature detected by the outside air temperature sensor 2 is higher than the display temperature, Assuming that the outside air temperature sensor 2 is affected by the heat of the engine, the display value is not updated until the temperature environment of the outside air temperature sensor 2 is improved by the traveling wind.

The control unit 4 detects the traveling speed V by the traveling speed sensor 6 and stabilizes the traveling of the vehicle to a predetermined speed V0.
At a speed of 20 km / h or more set as
It is determined whether or not the vehicle continues to travel for 30 seconds or more set as 0. If this condition is satisfied, it is determined that the temperature environment of the outside air temperature sensor 2 has sufficiently approached the outside air temperature due to the running wind. Constant temperature at fixed time intervals,
Here, a process of bringing the display value close to the detected value only once per minute is performed. That is, the outside temperature data C0 which is the display value
Is performed once closer to the outside air temperature data CN detected by the outside air temperature sensor 2 at that time, and is updated to the outside air temperature data C0 for making this a display value, and the display is updated by the outside air temperature display unit 5.

Therefore, the temperature displayed on the outside temperature display section 5 can be displayed as a value close to the actual outside temperature in a state where the temperature of the engine is not greatly affected.

On the other hand, the control unit 4 determines that the traveling speed is a predetermined speed V
If the temperature does not exceed 20 km / h, which is 0, or does not continue for more than 30 seconds, which is the predetermined time T0, even if it exceeds, the temperature environment of the outside air temperature sensor 2 is sufficiently close to the outside air temperature due to the traveling wind. It is determined whether or not the temperature in the engine room has been cooled based on the other condition, e.g., the elapsed time t from when the start switch 1 is turned on to off or the temperature of the cooling water.

In this case, the elapsed time from when the start switch 1 is turned off to when it is turned on is measured by the control unit 4. If the detected temperature environment has passed 30 minutes or more, which has been set as the predetermined value t0 at which it can be determined that the engine has not received heat, the external temperature data CN, which is the detection output of the external temperature sensor 2, is displayed. If not, the processing from the detection of the traveling speed is repeated.

As conditions for determining whether or not the engine is not affected by the heat of the engine, the temperature of the cooling water is used in addition to the elapsed time from when the start switch 1 is turned on to when it is turned on. Can be.

That is, when the engine is stopped, the temperature of the cooling water drops, so that the temperature in the engine room also drops. For example, the temperature of the cooling water is 30 degrees or less, or depending on the vehicle, When the temperature falls below 60 degrees, it is determined that the detected temperature environment of the outside air temperature sensor 2 is sufficiently close to the outside air temperature.
May be updated.

Further, when the detection data of the outside air temperature sensor 2 can be detected in a correct state, the start switch 1 is turned on after the start switch 1 is turned on in order to adopt this detection data earlier.
Further, in the temperature display update processing cycle, in the step of comparing the outside temperature data C0, which is a display value, and the outside temperature data CN detected by the outside temperature sensor 2, the outside temperature data is executed before the step of determining the traveling speed state. If CN is smaller than the display temperature of the outside air temperature data C0, it is assumed that the temperature environment of the outside air temperature sensor 2 is close to the actual temperature unaffected by the heat of the engine. C0 is updated and displayed on the outside air temperature data CN, which is the detection output of the outside air temperature sensor 2 at this time.

Here, since the processing cycle of the execution routine in the control unit 4 is fast, the data update in this determination is executed at intervals of 2 seconds so that the update of the display value does not suddenly change or flicker. .

According to the above-described processing, for example, when the vehicle is temporarily stopped without stopping the engine, or when the engine is stopped and the running is started before a long time elapses, the stop may cause the outside air temperature to be reduced as in the case of running. Since there is no running wind that makes the temperature environment of the sensor 2 close to the actual outside temperature, the heat in the engine room increases, and the detection output of the outside temperature sensor 2 also increases accordingly. Therefore, if the detection and display are performed as they are, a high temperature different from the actual outside air temperature will be displayed. However, in the present invention, such a display that is not greatly affected by the heat of the engine can be performed.

That is, when the vehicle is temporarily stopped without turning off the start switch 1, the temperature in the engine room also increases. However, in the traveling speed determination step in the processing routine, the traveling speed becomes lower than the predetermined value V0. In processing, the process proceeds to an off time determination step of the start switch 1, where it is determined that the elapsed time is less than the predetermined time T0, and the display value is a temperature close to the actual outside air temperature due to the traveling wind during the previous traveling. It remains displayed without being updated.

Further, even when the vehicle starts running shortly after the engine is stopped, the vehicle starts running in a state in which the temperature in the engine room is rising from the detection environment close to the actual outside temperature due to the running wind. Although the detection output of the outside air temperature sensor 2 becomes the increased temperature, when the start switch 1 is turned off, the detected temperature at that time is stored in the data holding means 3 as the outside air temperature data C0. Since the outside air temperature data C0 is read and displayed when the switch 1 is turned on, the display value can indicate the detected temperature in a state where the temperature is not affected by the heat of the engine.

Further, for example, the stored outside air temperature data C0 when the start switch 1 is turned off during a hot daytime zone.
When the outside temperature data CN detected by the outside temperature sensor 2 is low when the start switch 1 is turned on when traveling in a cool evening, the outside temperature data C0 stored in the data holding means 3 when the start switch 1 is turned on. Is displayed higher than the low temperature in the evening, but immediately after that, the outside air temperature data CN which is the detection output of the outside air temperature sensor 2
The display is updated to the lower outside temperature data CN after 2 seconds by comparison with the above, so that the high temperature is displayed temporarily at the time of starting, but the actual outside temperature can be displayed immediately and the actual outside temperature display There is no particular problem for grasping.

However, if the user does not like such a temporary high display at the time of starting, the external temperature display section 5 is activated a few seconds after the start switch 1 is turned on or blank display is performed for a few seconds, so that the actual outside is displayed. Correct display can be performed at a timing that does not hinder temperature confirmation. In addition, since there is a slight delay in the actual startup due to the power supply to the automotive electrical components in terms of the circuit, by taking into account such a delay time, a pseudo display such as a standby display is performed to give a sense of discomfort until the correct display is performed. You may make it cancel.

For example, a display such as "----" may be displayed as a standby display by using an arbitrary segment of the day-shaped segment which forms a numerical display.

The control unit 4 is connected directly to the battery without passing through the start switch 1 to measure an elapsed time from the turning-off of the start switch 1 to the on-state, and as a holding power source for the volatile data holding means 3. However, when the determination is made by detecting the temperature of the cooling water or when the non-volatile memory is used as the data holding means 3, these may also be connected to the power supply via the start switch 1, and the determination after the start switch 1 is turned off For this purpose, a capacitor functioning as a backup power supply for a certain period of time may be connected.

[0038]

According to the present invention, the temperature affected by the heat of the engine detected by the outside air temperature sensor installed in the engine room is not displayed, and the temperature closer to the actual outside air temperature is outside. It can be displayed as air temperature, and it is reliable as an update indicator of outside temperature without discomfort, as an index of running behavior by grasping the temperature outside the vehicle at the start of driving, or as a temperature index of outside activity during leisure driving The outside temperature can be displayed.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of an automotive outside air temperature detection display device according to the present invention.

FIG. 2 is an operation flowchart illustrating an outside air temperature display operation according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 start switch 2 outside temperature sensor 3 data holding means 4 control unit 5 outside temperature display unit 6 traveling speed sensor

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B60H 1/00 101 B60H 1/00 103

Claims (5)

(57) [Claims] 1. A data holding means for storing outside air temperature data detected by an outside air temperature sensor disposed in an engine room of an automobile by turning off a start key of the automobile,
A control unit that inputs the temperature detected by the outside air temperature sensor and outputs it as outside air temperature data after a predetermined process, and an outside air temperature display unit that displays the temperature as the outside air temperature based on the outside air temperature data output from this control unit. And the control unit comprises:
When the start key of the vehicle is turned on, the outside temperature data stored in the data holding means is read, and the read outside temperature data is larger than the outside temperature data detected by the outside temperature sensor, and is detected by the traveling speed sensor. When it is determined that the determined traveling speed is equal to or higher than the predetermined speed and continues for a predetermined time or longer, the outside air temperature data in the data storage unit is determined.
Gradually approach the outside temperature data from the outside temperature sensor.
Only, when the traveling speed is determined not to be predetermined time or longer at a predetermined value or more, in a state where the outside temperature sensor is not subject to determine whether a state that is not affected by the warm temperature of the engine An external air temperature detection display device for an automobile, wherein the external air temperature is controlled based on the external air temperature data detected by the external air temperature sensor. 2. The control unit according to claim 1, wherein when the outside air temperature data stored in said data holding unit read by turning on a start key of the vehicle is smaller than the outside air temperature data detected by said outside air temperature sensor, automotive air temperature detection display device according to claim 1, characterized in that the display update on the outside air temperature data from the outdoor temperature sensor in the time period. 3. The control unit measures an elapsed time from when the start key is turned on to when the start key is turned on, and when the elapsed time is equal to or more than a predetermined value, the outside temperature sensor is affected by the warm air temperature of the engine. The vehicle outside temperature detecting and displaying device according to claim 1 or 2, wherein it is determined that there is no state. 4. The control unit inputs water temperature data detected by a cooling water temperature sensor of an automobile, and when the water temperature data is equal to or less than a predetermined value, the outside air temperature sensor is not affected by the warm air temperature of the engine. The vehicle outside temperature detection display device according to claim 1 or 2, wherein it is determined that a state has been reached. 5. The control unit displays an outside air temperature on the outside air temperature display unit after a lapse of a predetermined time from the operation of the start key, and sets the outside air temperature display unit to blank for a predetermined time until the outside air temperature display. 3. The vehicle outside temperature detection display device according to claim 1, wherein a standby display is provided in a predetermined display shape. 4.