JPS6233619Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a ventilation system for a vehicle, and more specifically to a ventilation system for a vehicle that automatically forcibly ventilates the interior of a vehicle when the smoke concentration inside the vehicle reaches a certain level or higher.

Conventional vehicle interior ventilation systems are configured to operate the ventilation system manually by the driver to ventilate the interior of the vehicle. For this reason, even if the smoke from cigarettes reaches a certain level inside the vehicle, some people may not notice it, or may neglect to perform manual operations due to the inconvenience of manual operations, which may harm the health of the occupants. It was hot.

SUMMARY OF THE INVENTION An object of the present invention is to provide an in-vehicle ventilation system that automatically ventilates the interior of a vehicle in view of the drawbacks of the conventional devices described above.

In order to achieve the above object, the present invention includes a smoke sensor that detects the smoke concentration in the vehicle interior, and a comparator that takes in the detection output of the smoke sensor and outputs a comparison signal when the smoke concentration in the vehicle interior exceeds a predetermined value. a blower motor that circulates air within the vehicle interior, a manual switch that changes the rotation speed of the blower motor, a drive means that adjusts the opening degree of an inside/outside air switching damper that switches between air inside and outside the vehicle interior; a control section that outputs a high-speed rotation command signal to the blower motor based on a comparison signal of a comparator and outputs a control signal for switching the inside/outside air switching damper to the outside air side to the driving means, and the rotation speed of the blower motor is controlled by a manual switch. It is characterized in that it can be selectively switched by the operation of.

Hereinafter, embodiments of the present invention will be described based on the drawings. Figure 1 shows the circuit configuration of the control section of the vehicle interior ventilation system according to the present invention. In the figure, 1 is a smoke sensor that detects the smoke concentration in the vehicle interior, and its output characteristics are shown in Figure 2. As shown, smoke density (%/m)
There is a linear relationship with . This smoke sensor is composed of, for example, a light emitting element and a photosensitive element, and can detect smoke concentration from the degree of attenuation of light emitted from the light emitting element. Reference numeral 3 denotes a reference voltage generating section which generates a reference voltage V _C from the voltage supplied from the battery V _B via the ignition switch 2 and resistor R1, and is composed of a Zener diode ZD1 and resistors R2 and R3. Further, 4 is a comparator having hysteresis characteristics as shown in FIG.
_C and outputs a comparison signal V _OUT to the blower motor control circuit 5 and the inside/outside air switching control circuit 9. This comparator 4 can be easily realized using a well-known Schmitt trigger circuit.

On the other hand, when the comparison signal V _OUT of the comparator 4 is V _OUT =1 (logical level), the blower motor control circuit 5 controls the rotation speed of the blower motor 7 to a high rotation speed (H _i ).

At this time, the inside/outside air switching control circuit 9 drives the servo motor 10 to switch the inside/outside air switching damper 30 provided in the passage 20 leading to the outside of the vehicle cabin shown in FIG. Ventilate.

Furthermore, 6 is a manual switch for manually changing the rotation speed of the blower motor 7, and when the switches 6-1, 6-2, 6-3, and 6-4 are operated, the blower motor 7 is set to H _i (high rotation), respectively. It can be switched to M _id (middle rotation speed), L _p (low rotation), and OFF. Therefore, by operating this manual switch 6, the rotation speed of the blower motor can be set according to various conditions or the preferences of the vehicle user, and the rotation speed can be switched to the desired rotation speed as necessary even while the motor is operating. It is.

Further, 8 is a manual switch for manually operating the forward and reverse rotation of the servo motor 10, that is, switching between inside and outside air, and switch 8-1 is an inside air switch for switching the inside and outside air switching damper 30 to the inside and outside air side B. The switch 8-2 is an outside air switch for switching the inside/outside air switching damper 30 to the outside air side A.
Therefore, if the switch 8-1 is set, the communication between the interior air and the outside air is cut off, and the air inside the vehicle is circulated, while if the switch 8-2 is switched, the ventilation between the interior air and the outside air is stopped. It will be done.

Note that the control section 50 consisting of the blower motor control circuit 5 and the inside/outside air switching control circuit 9 may be configured only by hardware, but in this embodiment, it is configured by a microcomputer.

Next, FIG. 5 shows the processing contents of the control section 50. In the figure, when the program is started at step 100, initial settings are made at step 102.
i.e. blower flag FLBL and outside air flag
FLIN is set, the blower motor 7 is set to "L _p ", and the inside/outside air switching damper 30 is switched to the outside air side A. Here is the blower flag FLBL, the inside/outside air flag
If both FLIN are “1”, it is auto mode, and “0”
In the case of , it means that the control section operates in manual mode. Further next step 104
Then, it is determined whether the comparison signal V _OUT of the comparator 4 has become logic "1", in other words, it is determined whether the smoke density in the vehicle interior has reached 30%/m or more.
If the determination in step 104 is "NO", the process moves to step 106. If neither of the manual switches 6 and 8 is pressed here, steps 106, 108, 110,
112, 122, 124 are determined as “NO”,
In the next step 130, the blower flag FLBL and the inside/outside air flag FLIN are set, and the process returns to step 104.

Meanwhile, steps 106, 108, 110, 11
2, manual switch 6, switch 6-
When any one of 1, 6-2, 6-3, and 6-4 is operated, control is performed to set the rotation speed of the blower motor 7 to "H _i ", "M _id ", and "L _p ", respectively. A signal or a control signal for stopping the motor 7 is output to the motor 7, and the process moves to step 122. Furthermore, in steps 122 and 124, the outside air switch 8-1,
When either of the inside air switches 8-2 is operated, a control signal for switching the inside/outside air switching damper 30 to the inside air side B or the outside air side A is output to the servo motor 10, and the process moves to step 130 where a similar process is performed. Processing is done.

If "YES" is determined in step 104, it is determined in the next step 132 whether or not the blower flag FLBL has been reset, in other words, whether or not the mode has been switched to manual mode. If the determination is ``YES'', the process jumps to step 138. On the other hand, if the determination in step 132 is "NO", the process moves to the next step 134, in which the blower motor 7 is set to " _Hi ", and in the next step 136, the blower flag FLBL is set to "1",
The process moves to step 138. At step 138, it is determined whether or not the inside/outside air flag FLIN has been reset. If the determination at step 138 is "YES", the process jumps to step 144.

On the other hand, if the determination in step 138 is "NO", in the next step 140, the inside/outside air switching damper 3 is
0 to the outside air side A, the outside air flag FLIN is set at step 142, and the process moves to step 144.

If neither manual switch 6 nor 8 is operated at this time, steps 144 and 14 are performed.
“NO” at 6,148,150,162,168
If so, the process returns to step 104 and the same process is performed. On the other hand, steps 144, 146, 14
When the manual switch 6, that is, any one of the switches 6-1, 6-2, 6-3, and 6-4 is operated at 8,150, the blower motor 7 is
A control signal for setting the rotation speed of the motor to "H _i ", "M _id ", "L _p " or a control signal for stopping the motor 7 is output to the motor 7 (steps 152 and 15).
4, 156, 158), the blower flag FLBL is reset in step 160, and the process proceeds to step 162. In step 162, the internal air switch 8-1
It is determined whether or not the has been operated, and step 16
If “YES” is determined in step 2, proceed to step 1.
64, in step 164 the internal/external air switching damper 30 is switched to the internal air side B, in step 166 the internal/external air flag is reset, and the process proceeds to the next step 168. Then, in step 168, it is determined whether or not the outside air switch 8-2 has been operated. If the judgment is "YES" in step 168, the inside/outside air switching damper 30 is switched to the outside air side A in step 170, and the process proceeds to step 104. The process returns and the same processing as described above is performed.

In this embodiment, the damper for switching between inside and outside air is opened and closed by rotating a servo motor, but it goes without saying that the invention is not limited to this and can be replaced with other means such as a negative pressure diaphragm. stomach.

As explained above, the present invention is configured to automatically perform forced ventilation in the vehicle interior when the smoke concentration in the vehicle interior reaches a predetermined value. You are freed from hassle and the cleanliness of the vehicle interior is ensured.

In addition, a manual switch is provided that allows for arbitrary selection of the blower motor rotation speed, so the optimal ventilation speed can be set and changed according to various situations or vehicle user preferences, ensuring comfort in the vehicle interior. Can be retained.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing the configuration of the in-vehicle ventilation system according to the present invention, FIG. 2 is a characteristic diagram showing an example of the output characteristics of the smoke sensor 1, FIG. 3 is a diagram showing the hysteresis characteristics of the comparator 4, and FIG. The figure is an explanatory diagram showing an outline of the internal/external air switching mechanism, and FIG. 5 is a flowchart showing the processing contents of the control section 50. 1...Smoke sensor, 4...Comparator, 7...
Blower motor, 10... Servo motor, 50...
control section.

Claims (1)

[Scope of utility model registration request] A smoke sensor that detects the smoke concentration in the vehicle interior, a comparator that receives the detection output of the smoke sensor and outputs a comparison signal when the smoke concentration in the vehicle interior exceeds a predetermined value, and a blower motor that circulates the air in the vehicle interior. , a manual switch for changing the rotational speed of the blower motor, a driving means for adjusting the opening degree of an inside/outside air switching damper for switching between air inside and outside the vehicle interior, and a driving means for controlling the blower motor to rotate at high speed based on a comparison signal from the comparator during automatic operation. a control unit that outputs a command signal and outputs a control signal for switching the inside/outside air switching damper to the outside air side to the driving means, and the rotation speed of the blower motor is selectively switchable by operating a manual switch. A vehicle interior ventilation system featuring: