JPS6332062Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for checking the operation of an automobile window defogger.

A wind defogger, which is a heating wire, is printed on the rear window of an automobile and is configured to heat the glass surface, prevent it from fogging up, and ensure rearward visibility. Conventionally, in order to check the anti-fogging effect of this window defogger in the automobile production process, it was necessary to touch the glass surface with the windshield defogger energized and check the temperature rise with the sense of a human hand. I was doing it. For this reason, there is a high possibility of erroneous judgments, and there are disadvantages in that it takes a long time (for example, about 15 to 16 minutes) to make a judgment.

The present invention eliminates the above-mentioned drawbacks by using a device having the configuration described in the claims for utility model registration, and electrically detects the surface temperature of a window glass equipped with a wind defogger and the surrounding atmospheric temperature. An object of the present invention is to provide an apparatus for confirming the operation of a windshield defogger for an automobile, which can automatically determine whether the antifogging action of the windshield defogger is good or bad based on the state of the temperature difference.

The present invention will be explained below with reference to embodiments shown in the drawings.

The illustrated device of the present invention is composed of a sensor main body 1 shown in FIG. 1 and a device main body 2 shown in FIG. 2.

The interior of the case 3 of the sensor body 1 is separated into two upper and lower chambers, and an atmospheric temperature detection sensor 4 such as a thermistor is incorporated in the upper chamber open to the atmosphere. Further, the lower chamber portion communicates with a suction cup 5 made of rubber or the like fixed to the bottom surface of the case 3.
A window glass surface temperature detection sensor 6 such as a thermistor is incorporated inside. Furthermore, a negative pressure supply source (not shown) is connected to the lower chamber via a hose 7 and a solenoid valve 8, and as will be clear from the operation description below, the suction cup 5 is pressed against the rear window of the automobile. At this time, by operating the limit switch 9 on the side of the case 3, the air inside the suction cup 5 is suctioned by negative pressure, and the suction cup 5 is automatically attracted to the surface of the window glass. As shown in FIG. 3, this sensor body 1 is suspended from an inclined beam 10 installed on the ceiling of an automobile assembly production line using a pulley 11 and a balancer 12 so as to be movable in the front and back direction and extendable in the vertical direction. It is being

As shown in FIG. 2, on the front side of the main body 2 of the device, there are a power switch 13 and a group of temperature difference display lamps 1.
4. OK lamp 15 and NG lamp 1 that display the judgment result of the anti-fog effect of the wind defogger.
6 is provided. Further, inside the device main body 2, electric circuits as illustrated in FIGS. 4 to 6 are built-in. That is, a temperature difference detection circuit 17 (FIG. 4) that calculates the difference between the window glass surface temperature detected by the window glass surface temperature detection sensor 6 and the atmospheric temperature detection sensor 4 and the atmospheric temperature, and monitors the magnitude of the temperature difference. , a determination circuit 18 (FIGS. 5 and 6) that determines that the window defogger is normal when the temperature difference is above the set value, and determines that the windshield defogger is defective when it is below the set value; A display circuit 19 (FIG. 6) for displaying information using the OK lamp 15, NG lamp 16, etc. is incorporated. As shown in FIG. 3, the main body 2 of the apparatus is placed at a position where the inspector W can easily see it, such as at the tip of the inclined beam 10.

In the above configuration, when the car C is now in a fixed position, the inspector W grasps the handle 20 of the sensor body 1 and presses the suction cup 5 at the bottom of the case against the center of the rear window where the printed wiring of the wind defogger is printed. . As a result, the contact of the limit switch 9 closes, the light emitting element 22 in the photocoupler 21 shown in FIG. 5 emits light, and the collector potential of the phototransistor 23 goes to the "0" level. The “0” signal indicating the start of this judgment operation is transmitted to the inverters 24 and 25.
The signal is inverted and becomes a "1" signal, which is sent to the transistor 26, NAND gate 27, and timer IC 28, respectively.

When the transistor 26 is made conductive by the "1" signal from the inverter 24, the relay 29 is activated.
The solenoid valve 8 is turned on and its valve section is in the "open" state. For this reason, as is clear from Fig. 1, the suction cup 5
The air inside is sucked by a negative pressure source through a hose 7 and a solenoid valve 8, and the suction cup 5 is automatically attracted to the rear window. In this way, the sensor body 1
When the suction cup 5 automatically adsorbs to the rear window,
A window glass surface temperature detection sensor 6 is in contact with the rear window glass surface to detect a temperature rise on the glass surface caused by the window defogger, and an atmospheric temperature detection sensor 5 detects the surrounding atmospheric temperature. The temperature difference detection circuit 17 shown in FIG. 4 determines the difference between the windshield surface temperature and the atmospheric temperature using a differential amplifier 30, and outputs a temperature difference signal via a buffer amplifier 31 to the A/D determination circuit 18 shown in FIG. The signal is sent to the D conversion circuit (five step analog comparator) 32.

The A/D conversion circuit 32 is a level detection circuit that converts the temperature difference signal sent from the temperature difference detection circuit 17 into a 5-step voltage of, for example, 0.2V. The size of is determined. Depending on the size of this temperature difference,
The corresponding level lamp of the level display lamp group 14 consisting of LEDs and the like lights up to notify the inspector W of the current temperature difference status. Then, when the temperature difference reaches a certain set level, the light emitting element 34 of the photocoupler 33 emits light, and the collector potential of the phototransistor 35 becomes "O" state. Note that this photocoupler 33 and the aforementioned photocoupler 21 are used for signal level conversion.

The “0” signal of the photocoupler 33 is inverted by the inverter 44 and output as a “1” signal to the timer IC.
45. Timer IC45 has 4 resistors
6. Generate a steep trigger pulse with a narrow pulse width determined by the capacitor 47. This trigger pulse is inverted by an inverter 48 to become a negative pulse, which triggers a timer IC 49 at the next stage. The timer IC 49 receives a trigger pulse and resistors 50,
A "1" signal is output for a predetermined timer period determined by the capacitor 51. In other words, when the temperature difference between the temperature of the surface of the rear window glass of the automobile, which rises by energizing the windshield defogger, and the ambient air temperature exceeds a predetermined set value, the timer IC 49 is activated. It outputs a "1" signal indicating normal operation for a predetermined period of time. The "1" signal from the timer IC 49 is output to OUT C as it is, and is also inverted by the inverter 52 and output to OUT B.

On the other hand, as described above, the sensor body 1 is attracted to the rear window, and at the same time the limit switch 9 and the photo coupler 21 are activated, the timer IC 28
outputs a steep trigger pulse with a narrow pulse width determined by the resistor 36 and capacitor 37 in response to the “1” signal from the inverter 25. This trigger pulse is inverted by the inverter 38 to become a negative pulse, which triggers the timer IC 39. The timer IC 39 normally has an output of "0", and when triggered, starts timer operation and outputs "1" while the timer is operating. Determined by Therefore, when the output of the timer IC 39 returns to the "0" state after a predetermined timer operation time has elapsed, the "0" signal is inverted by the inverter 42 and output to the NAND gate 27.
is sent to one input terminal of NAND gate 2
Since the "1" signal from the inverter 25 is input to the other input terminal of the NAND gate 27, the NAND gate 27 becomes the output "0" state, and this "0" signal is inverted by the inverter 43 and becomes a "1" signal. as
Output to OUTC. That is, to put the above operation in another way, the limit switch 9 is activated and after a predetermined time has elapsed, CUT C is set to the "1" state.
When OUTC becomes "1", it becomes possible for the first time to determine the quality of the window defogger. Incidentally, a time chart of the operation of the portions related to the timer IC 39 is shown in FIG.

As a result of the above operations, the NAND gate 53 shown in FIG. 6 operates when both IN C and IN D are in the "1" state, that is, after a predetermined time has elapsed, the temperature difference between the rear window surface and the surrounding atmosphere reaches a predetermined value. When this happens, the output becomes "0", and this "0" output is inverted by the inverter 54 and sent to the transistor 55, making the transistor 55 conductive. As a result, the OK lamp 15 of the display circuit 19 lights up, automatically indicating that the operation of the window defogger is normal. Also, the NAND gate 56 is connected to IN B.
When both IN and C are in the "1" state, that is, when the temperature difference between the rear window surface and the surrounding atmosphere is less than the predetermined value even after a predetermined period of time has elapsed, the output becomes "0", and this "0" Output is inverter 57
is inverted to make transistor 58 conductive. As a result, the NG lamp 16 of the display circuit 19 lights up,
Automatically displays that the wind defogger is malfunctioning.

In addition, as a display means of the display circuit 19, OK
In addition to the lamp 15 and the NG lamp 16, the determination result may be displayed at another location using buzzers 59, 60 or signal transfer relays 61, 62.

After determining and displaying the quality of the wind defogger as described above, if the solenoid valve 8 is turned off by a control circuit (not shown) and opened to the atmosphere, the suction cup 5
loses its adsorption force, and the sensor body 1 becomes the balancer 1.
At the same time, it is automatically lifted up by the pulley 11 on the inclined beam 10 and automatically returned to the regular position shown in FIG. 3, in preparation for the next work of determining the quality of the window defogger.

In addition, in the above-mentioned embodiment, a timer IC 39 is provided in the determination circuit 18 in consideration of the response speed of the sensors 5 and 6, and the display operation is performed after a predetermined time. The display operation may be continuously performed immediately upon the start of the test without employing a delayed operation.

Since the device of the present invention has the configuration and operation as explained above, the judgment is extremely accurate and there are no erroneous judgments compared to the conventional testing method that relies on human intuition, and the detection sensitivity is high. The time required for the determination work is also shortened, and when applied to automobile production lines, etc., it is highly effective in improving vehicle quality and production efficiency.

[Brief explanation of drawings]

Figure 1 is a schematic cross-sectional view of the sensor body of the device of the present invention, Figure 2 is an external view of the body of the device of the present invention, and Figure 3 is an example of the device of the present invention installed in an automobile production line. 4 is a circuit diagram showing an example of a temperature detection circuit, FIG. 5 is a circuit diagram showing an example of a determination circuit, FIG. 6 is a circuit diagram showing an example of a display circuit, and FIG. The figure is timer IC39 in Figure 5.
This is a time chart showing the operation of related parts. DESCRIPTION OF SYMBOLS 1...Sensor body, 2...Device body, 4...Sensor for detecting atmospheric temperature, 5...Sucker, 6...Sensor for detecting window glass surface temperature, 17...Temperature difference detection circuit, 18...Judgment circuit , 19...display circuit, C...automobile.

Claims (1)

[Scope of utility model registration request] a windshield surface temperature detection sensor for detecting the surface temperature of a windshield equipped with a windshield defogger; an atmospheric temperature detection sensor for detecting the surrounding atmospheric temperature; a temperature difference detection circuit for determining the temperature difference between the windshield surface temperature detected by the two sensors and the atmospheric temperature; a judgment circuit for monitoring the magnitude of the temperature difference and judging that the windshield defogger is normal when the temperature difference is equal to or greater than a set value and judging that the windshield defogger is defective when the temperature difference is equal to or less than the set value; and a display circuit for displaying the judgment result of the judgment circuit on a required display means.