JPH0739251B2 - Palm temperature measuring device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a palm temperature measuring device for measuring a palm temperature of a subject.

<Prior Art> As one of accident prevention devices that prevent accidents due to drowsy driving, etc., the physiological state of a person (driver) who has been driving an automobile or the like has been conventionally measured, and the driver's fatigue is measured. 2. Description of the Related Art A physiological condition measuring device that detects a condition and the like is known.

This physiological condition measuring device detects the driver's conscious action, physiological condition, etc. based on the output of a sensor attached to the driver's body, and the driver's fatigue condition based on the detection result. Etc. are measured, and if the measurement result is a certain value or more, the driver is alerted to prevent an accident.

<Problems to be Solved by the Invention> By the way, in such a conventional physiological condition measuring device, a sensor is directly attached to the driver's body, which causes a problem that the driver feels uncomfortable. .

In particular, the driver's palm temperature, which is one of the important physiological indicators that may be a sign of falling asleep, needs to be constantly monitored even during driving, so that the driver does not feel uncomfortable and the driver does not feel uncomfortable. There has been a strong demand for development of a device that does not cause any trouble.

In view of the above circumstances, the present invention does not give the driver a feeling of strangeness,
Another object of the present invention is to provide a palm temperature measuring device capable of constantly monitoring the palm temperature of a driver while not hindering driving.

<Means for Solving the Problems> In order to solve the above problems, the palm temperature measuring device according to the present invention is a palm temperature measuring device for measuring the palm temperature of a subject, where the palm of the subject touches. And a temperature sensor group including a plurality of temperature sensors provided in the vicinity of the temperature sensor group, and it is determined whether the output of a predetermined number of adjacent temperature sensors of the temperature sensor group is lower or higher than the output of another temperature sensor by a predetermined temperature. A signal processing unit that outputs the output of the predetermined number of temperature sensors as palm temperature when the output of the predetermined number of temperature sensors is lower or higher than the output of other temperature sensors by the predetermined temperature. I am trying.

<Embodiment> FIG. 1 is a plan view showing an embodiment of a palm temperature measuring apparatus according to the present invention, and FIG. 2 is a sectional view of the same embodiment.

The palm temperature measuring device shown in these figures is used as a steering wheel of an automobile, and includes a rim 1 and
And spokes 2.

The rim 1 has a plurality of temperature sensors 3-1 to 3 around the outer periphery thereof.
-N are arranged at equal intervals to form a sensor group, and the measurement results of these temperature sensors 3-1 to 3-n are supplied to the signal processing unit 4 provided in the spoke 2.

The signal processing unit 4 identifies which part of the rim 1 the driver holds based on the measurement result of each of the temperature sensors 3-1 to 3-n, and measures the palm temperature of the driver. As shown in FIG. 3, it is provided with a multiplexer 5, an amplifier 6, an A / D converter 7, and a CPU (central processing unit) 8.

The multiplexer 5 selects any one of the temperature sensors 3-1 to 3-n according to the sensor select signal S1 output from the CPU 8, and the measurement result of the selected temperature sensor (temperature signal ) Is taken in, and this is supplied to the amplifier 6, where the temperature signal is amplified to A /
It is supplied to the D converter 7.

The A / D converter 7 is configured to perform A / D conversion (analog / digital conversion) on the temperature signal supplied from the amplifier 6, and temperature data obtained by this A / D conversion operation. Is supplied to the CPU8.

The CPU 8 includes a microprocessor and the like, and operates as described below.

First, if this palm temperature measuring device is turned on, CPU8
Each part of the circuit is initialized by the step ST1 of the flow chart shown in the figure, and then the value of the sensor select signal S1 is sequentially incremented to cause the multiplexer 5 to sequentially select each of the temperature sensors 3-1 to 3-n. Three
The temperature signals obtained by -1 to 3-n are fed to the amplifier 6 and A / D
It is sequentially taken in through the converter 7 and the outer peripheral temperature Ft (r) of the rim 1 is measured.

Next, in step ST2, the CPU 8 checks whether or not there is a portion of the rim 1 where the temperature is lowered by the width a of the palm based on the measurement result, and if the outer peripheral temperature of the rim 1 is as shown in FIG. If there is a part of Ft (r) where the temperature is decreasing with a width a of the palm, then this step ST2 branches to step ST3, where the temperature T1 of this low temperature part falls within the range of 25 ° C to 40 ° C. Check if the temperature is lower than the temperature T2 of other parts by 2 ℃ or more.

If the temperature T1 of the low temperature portion is within the range of 25 ° C to 40 ° C and is lower than the temperature T2 of other portions by 2 ° C or more, the CPU 8 branches from this step ST3 to step ST4, and here, This temperature T1 is regarded as the palm temperature of the driver, and the temperature T1 is displayed on the display 10 provided on the spoke 2 at step ST5.

Further, in the step ST2, the outer peripheral temperature Ft of the rim 1 is
In (r), there is no part where the temperature is lowered with a width a of about the palm, or at step ST3, the temperature T1 of the low temperature part
Is not within the range of 25 ° C to 40 ° C, and if the temperature T1 of this low temperature portion is not lower than the temperature T2 of other portions by 2 ° C or more, the CPU 8 branches from the step ST2 or step ST3 to step ST6. Then, the outer peripheral temperature Ft of the rim 1 is
Check whether or not (r) has a portion with a width a which is about the palm and has a high temperature.

If there is such a high temperature portion as shown in FIG. 6, the CPU 8 branches from the step ST6 to the step ST7, where the temperature T3 of the high temperature portion falls within the range of 25 ° C to 40 ° C. Check whether the temperature is higher than the temperature T4 of other parts by 2 ℃ or more.

If the temperature T3 of the high temperature portion is in the range of 25 ° C to 40 ° C and is higher than the temperature T4 of other portions by 2 ° C or more, the CPU 8 branches from this step ST7 to step ST8, and here This temperature T3 is regarded as the palm temperature of the driver, and this is displayed on the display 10 in step ST5.

Further, in the step ST6, the outer peripheral temperature Ft of the rim 1 is
(R) has a palm-like width a and has a high temperature.
In step ST7, the temperature T3 of the high temperature portion is 25 ° C ≤ T
If 3 ≦ 40 ° C. or (T4 + 2 ° C.) ≦ T3, the CPU 8 branches from the step ST6 or step ST7 to step ST9, and it is judged that the palm temperature cannot be measured, and the indicator is displayed. An error display will be displayed on 10 to inform the driver that the palm temperature cannot be measured.

As described above, in this embodiment, since the plurality of temperature sensors 3-1 to 3-n are arranged on the rim 1, the driver does not feel uncomfortable and the driver is not hindered. The palm temperature of the palm can be constantly monitored.

Further, in the embodiment described above, the outer peripheral temperature Ft of the rim 1 is
It is detected that the driver's palm touches this portion based on the fact that (r) has a high temperature portion and a low temperature portion with a width a of about the palm, but the rim 1 has a plurality of electrostatic charges. A sensor, a touch sensor, etc. are provided, the part touched by the driver's palm is detected based on the output of each of these electrostatic sensors and the touch sensor, and the temperature of this part is regarded as the driver's palm temperature,
This may be displayed on the display 10 provided on the rim 2.

Further, in the above-mentioned embodiment, the present invention has been described by taking the steering wheel of an automobile as an example, but the palm temperature measuring device according to the present invention is similar to the above-mentioned embodiment even when applied to a gear change lever of an automobile. The effect can be obtained.

<Effects of the Invention> As described above, according to the present invention, the temperature of the palm of the subject is constantly monitored while the subject such as the driver does not feel uncomfortable and the driver is not hindered. You can

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of a palm temperature measuring apparatus according to the present invention, FIG. 2 is a sectional view of the same embodiment, FIG. 3 is a block diagram of the same embodiment, and FIG. FIG. 5 is a temperature measurement curve diagram showing a measurement example of the same embodiment, and FIG. 6 is a temperature measurement curve diagram showing a measurement example of the same embodiment. 1 ... rim, 3-1 to 3-n ... temperature sensor, 4 ... signal processing unit.

Claims (1)

[Claims] 1. A palm temperature measuring device for measuring a palm temperature of a subject, wherein the temperature sensor group comprises a plurality of temperature sensors provided in a portion touched by the subject's palm and in the vicinity thereof, and the temperature sensor group. Among them, it is determined whether the output of the predetermined number of adjacent temperature sensors is lower or higher than the output of the other temperature sensors, and whether the output of the predetermined number of temperature sensors is lower than the output of the other temperature sensors. Alternatively, when the temperature is high, the palm temperature measuring device further comprises a signal processing unit that outputs the output of the predetermined number of temperature sensors as palm temperature.