JPH08156574A - Exhaust gas back flow safety device for automobile - Google Patents

Abstract

PURPOSE: To prevent the occurrence of accidents from CO poisoning due to the back flow of exhaust gas into a cabin by detecting CO gas inside the cabin of an automobile, and outputting a safety operation signal when the detected concentration of CO gas inside the cabin comes to a set reference value previously given for safety operation against CO gas. CONSTITUTION: The safety device 30 is equipped with a CO sensor 11, an unit time average CO detecting section 12, a ratio computation accumulating section 13, and with a comparison judging section 14 and the like, the comparison judging section 14 compares the accumulated value of each weighted ratio given by the ratio computation accumulating section 13 with the reference value of each CO safety operation such as an air introduction reference value given by a reference value setting section 15 and the like, when an accumulated value comes to the air introduction reference value, an air introduction control means 18 allows a blower 4 to be turned on, and also allows an outside air introducing damper 6 to be opened, so that outside air is thereby introduced into the cabin. And when the accumulated value comes to a reference value for starting a window opening operation, the air introduction control means gives an operation starting signal to a window opening operation commanding means 20, and furthermore, when the accumulated value comes to an engine-off reference value, it gives an operation start signal to an engine-off commanding means 21.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle exhaust gas backflow safety device for ensuring safety against carbon monoxide gas poisoning due to backflow of vehicle exhaust gas.

[0002]

2. Description of the Related Art In recent years, automobiles have been widely used for both business use and home use. Normally, on the front side of the vehicle, as shown in FIG.
A passage 5 for introducing air is formed in the passage 5, and a damper 6 for introducing outside air is provided in the passage 5 so as to be openable and closable. Further, a fan called a blower 4 is provided in order to diffuse the outside air introduced from the air introduction passage 5 into the vehicle interior 3 and to circulate the air in the vehicle interior 3.

The outside air introducing damper 6 is designed to be opened and closed by, for example, a manual operation. When the outside air introducing damper 6 is opened and the blower 4 is turned on (when the outside air introducing operation is performed). The air from the outside is introduced into the vehicle interior 3 of the automobile, and the outside air introduction damper 6 is introduced.
Is closed and the blower 4 is turned on (internal air circulation operation is performed), the air in the vehicle compartment 3 is internally circulated. When the blower 4 is turned off, the introduction of the external air and the internal circulation of the air are not performed regardless of whether the external air introduction damper 6 is open or closed.

[0004]

By the way, conventionally, carbon monoxide poisoning is caused by backflow of CO gas (carbon monoxide gas) in exhaust gas of a vehicle into the vehicle interior 3 while the vehicle is stopped. Accidents have frequently occurred.

In this accident, for example, in an old automobile or the like, exhaust gas leaking from holes in the muffler or the like flows into the passenger compartment 3 of the automobile through a gap in the body.
When the blower 4 of the vehicle is off, or when the outside air introduction damper 6 is closed even when the blower 4 is on, the outside air is not introduced into the vehicle interior 3. It is considered that the person in the vehicle interior 3 is poisoned by carbon monoxide due to the combination of the CO gas in the exhaust gas with the hemoglobin in the blood, and the person in the vehicle interior 3 is often killed by this poisoning. Was very problematic.

The present invention has been made to solve the above-mentioned conventional problems, and an object thereof is to prevent a carbon monoxide poisoning accident of a person in a vehicle interior due to backflow of exhaust gas of the vehicle into the vehicle interior of the vehicle. An object of the present invention is to provide an exhaust gas backflow safety device for an automobile, which can be prevented.

[0007]

In order to achieve the above object, the present invention is constructed as follows. That is, the present invention is provided with a CO detection sensor for detecting CO gas in the vehicle interior of an automobile, and the CO gas concentration in the vehicle interior detected by the CO detection sensor is preset to one or more CO safe operation setting criteria. When the value is reached, a safe operation signal output means for outputting a signal corresponding to the set reference value is provided.

An alarm notification reference value is given as the reference setting value, and C detected by the CO detection sensor is used.
When the O gas concentration reaches the air introduction reference value, the blower of the automobile is turned on, and the outside air introduction damper is opened to introduce the air outside the automobile into the vehicle interior through the blower. A control means is provided, and an alarm notification reference value is given as the setting reference value,
When the CO gas concentration detected by the CO detection sensor reaches the alarm notification reference value, alarm means for performing CO safety operation by alarm notification is provided, and the automobile automatically opens a window upon receiving a window open signal. Is provided with a window opening operation start reference value as the setting reference value, and when the CO gas concentration detected by the CO detection sensor reaches the window opening operation start reference value, A window opening operation command means for performing a CO safety operation for automatically opening a window of an automobile by adding a window opening signal to the power window mechanism is provided, and an engine off reference value is given as the setting reference value. When the CO gas concentration detected by the CO detection sensor reaches the engine-off reference value, it is confirmed that the vehicle is not running, and Providing the engine off command means for performing a CO safe operation of the down turned off is also a characteristic structure of the present invention.

Further, there is provided blood CO concentration calculating means for calculating the blood hemoglobin CO concentration when exposed to the atmosphere of the detected CO gas concentration based on the CO gas concentration detected by the CO detection sensor. , A CO safety in which the blood hemoglobin CO concentration calculated by the blood CO concentration calculation means is provided to the reference value setting unit. It is also a characteristic configuration of the present invention that a corresponding CO safety operation is performed when the operation reference value is reached.

[0010]

In the present invention having the above-mentioned structure, the CO gas concentration in the passenger compartment of the automobile is detected by the CO detection sensor, and the CO gas concentration is exposed based on the detected CO gas concentration or in the atmosphere of the detected CO gas concentration. On the basis of the blood hemoglobin CO concentration at that time, when these concentrations reach a preset reference value for CO safe operation, a signal corresponding to the set reference value is output by the safe operation signal output means. CO safe operation such as

When the concentration reaches the air introduction reference value, the air introduction control means turns on the blower of the automobile and opens the outside air introduction damper to allow the air outside the automobile to pass through the blower. Safe operation of CO introduced into the room is performed. Further, when the concentration reaches the alarm notification reference value, the CO safety operation by the alarm notification is performed by the alarm means. When the concentration reaches the window opening operation start reference value, the window opening operation command means applies a window opening signal to the power window mechanism provided in the vehicle to automatically open the window of the vehicle. CO safe operation is performed. Further, when the concentration reaches the engine-off reference value, the engine-off command means confirms that the vehicle is not running, and then performs a CO safety operation in which the engine of the vehicle is turned off.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The exhaust gas backflow safety device for an automobile of the present embodiment is a device for ensuring safety against CO gas when exhaust gas flows back into the vehicle interior 3, and a vehicle provided with the device of the present embodiment is: This is an automobile similar to the conventional automobile shown in FIG. 7, and an air introduction passage 5, an outside air introduction damper 6 and a blower 4 are provided on the front side of the automobile. In addition, this car received a window open signal,
A power window mechanism that automatically opens the window and a vehicle speed sensor that detects the speed of the vehicle are also provided.

FIG. 1 is a block diagram showing the essential structure of an embodiment of an automobile exhaust gas backflow safety device (hereinafter referred to as a safety device) according to the present invention. As shown in the figure, the safety device 30 includes a CO sensor 11 and a unit time average C.
O detection unit 12, ratio calculation integration unit 13, comparison determination unit 14, reference value setting unit 15, damping correction unit 16, air introduction control unit 18, alarm output unit 19, window opening operation command unit 20, engine off command unit 2
1. It has an alarm device 22.

The CO sensor 11 is a CO sensor in the passenger compartment 3 of the automobile.
It functions as a CO detection sensor for detecting the gas concentration, is provided at a desired position in the vehicle interior 3, and adds the detected CO gas concentration to the unit time average CO detection unit 12.

In this embodiment, the unit time average CO detection unit 12
And a ratio calculating and accumulating unit 13, a blood CO concentration calculating unit that calculates the blood hemoglobin CO concentration when exposed to the detected CO gas concentration based on the CO gas concentration detected by the CO sensor 11. The unit time average CO detection unit 12 detects the average CO concentration for each unit detection time t. For example, the unit detection time t is 10
When the time is set to seconds, the unit time average CO detection unit 12 samples the CO detection value from the CO sensor 11 every one second, and the sampled value is simply or weighted and the averaged value is used as the unit detection time t. The CO concentration is set, and the detected CO concentration value is added to the ratio calculation integration unit 13.

The ratio calculating / integrating unit 13 obtains a weighting ratio ER described below and an integrated value TR of the weighting ratio ER. FIG. 6 shows the increase state of blood CO hemoglobin (hemoglobin in blood combined with carbon monoxide) in relation to time when a person is exposed to an atmosphere containing a constant concentration of CO gas in a room. However, as is clear from this graph, the proportion of CO taken into the blood differs depending on the CO concentration in the air, and the concentration of CO gas emitted in the exhaust gas during engine combustion varies with time. Is fluctuating. In view of such circumstances, the present invention detects the CO concentration in the exhaust gas flowing back into the vehicle interior 3 at each unit detection time t, and integrates the amount of CO taken into the blood at each unit detection time t. By making a more accurate determination of the blood hemoglobin CO concentration (concentration of blood hemoglobin bound to carbon monoxide), the safety accuracy against CO gas poisoning is increased.

Table 1 shows the symptoms of carbon monoxide poisoning caused by the hemoglobin CO concentration in the blood. As can be seen from this table, various symptoms are caused by the hemoglobin CO concentration in the blood. And hemoglobin bound to carbon monoxide is 25% of hemoglobin in blood.
When it exceeds%, it reaches a dangerous state. The time to reach this dangerous state is reached in a short time when the CO gas concentration in the atmosphere is high, and even when the CO gas concentration is low, it is exposed to the atmosphere containing the CO gas for a long period of time, resulting in monoxide oxidation. The concentration of hemoglobin bound to carbon gradually increases and reaches a dangerous state after a certain period of time.

[0018]

[Table 1]

In calculating the weighting ratio ER, first, when a person is exposed to an atmosphere of the CO concentration detected at the unit detection time t, the time for the blood hemoglobin CO concentration to reach a predetermined dangerous reference concentration. Calculate T from the given data. The data for obtaining the time T to reach this dangerous reference concentration is created based on the simulation graph shown in FIG. 4 with the time of blood hemoglobin CO concentration as a variable.

FIG. 4 (a) is a graph showing the state of increase in blood hemoglobin CO concentration of a person in the closed chamber as a function of time when 1000 ppm of CO gas is constantly supplied to the closed chamber. From the graph, the time to reach a blood hemoglobin concentration of 25%, which is usually set as a standard for dangerous concentrations, is calculated as about 24 minutes, and the time to reach a safer 10% blood hemoglobin concentration is about 24 minutes. Calculated as 13.5 minutes. (B) of the same figure is always 2000 ppm CO
Hemoglobin C in blood when gas is supplied into a closed chamber
It shows an increase in O concentration, and hemoglobin C in blood.
An O concentration of 25% is reached in about 14.5 minutes, and a 10% concentration is reached in about 7.5 minutes. (C) in the figure is always 3000ppm
Shows the state of increase in blood hemoglobin CO concentration when the CO gas of 10 is supplied into the closed chamber. At this time, the blood hemoglobin CO concentration reaches 25% in 11 minutes and reaches 10%. It will take about 5.5 minutes.

When the dangerous standard concentration of the blood hemoglobin CO concentration is set to 25% which is a normally adopted value, the blood hemoglobin CO concentration is set in this embodiment for the sake of safety. Concentration risk standard concentration is set to 10%. Based on the simulation graphs of (a), (b), and (c) of FIG. 4, as shown in FIG. 5, the horizontal axis represents the amount of CO in the vehicle interior 3, and the vertical axis represents the time T until reaching the dangerous reference concentration.
At each coordinate, the CO amount and the value of the time T that becomes the dangerous reference concentration for the CO amount are plotted, and the plotted points are connected to obtain the time T for any detected CO concentration.
The graph data for obtaining is created, and this data is given to the ratio calculation integration unit 13.

In the simulation graph of FIG. 4,
When CO gas is 3000 ppm, the time T at which the hemoglobin CO concentration in the blood reaches the dangerous standard concentration is about 5.5 minutes, and when the CO gas in the graph of FIG.
It is 0.5 minutes, and both values do not match. In this embodiment, when the CO gas concentration is 3000 ppm, it is extremely abnormal and in a dangerous state, so that safety is assured and the exhaust gas CO is easily calculated so that the graph data can be easily calculated as a straight line.
The graph data shown in FIG. 5 is adopted by adopting a graph obtained by connecting two points W ₁ and W ₂ of the simulation graph with the concentrations of 1000 ppm and 2000 ppm. When this graph data is given, it is also possible to obtain a regression graph instead of a straight line, and it is also possible to adopt a weighted curve graph and use this as graph data.

Based on the graph data of FIG. 5, the ratio calculating / accumulating unit 13 changes the CO concentration per unit detection time added from the unit time average CO detection unit 12 to the blood hemoglobin CO concentration when exposed to the CO concentration. Calculate the time T at which the concentration reaches 10% of the dangerous standard concentration. Next, the ratio t / T between the unit detection time t and the time T to reach the dangerous concentration is calculated as the weighting ratio ER. When this ratio ER is exposed to the atmosphere of the detected CO concentration, of the time T reaching the dangerous reference concentration, the time t has already been spent, and only the remaining T-t, the C
It shows that there is no time for safety for O concentration. Then, the ratio calculation integration unit 13 obtains the weighted ratio ER and the integrated value of the weighted ratio ER based on the detected value of the CO concentration added from the unit time average CO detection unit 12 for each unit detection time t.

In this way, by adding the weighting ratio ER for each unit detection time t, the ratio of the total blood hemoglobin CO concentration to the dangerous reference concentration when exposed to the atmosphere of each CO concentration is obtained. . When the integrated value of the weighting ratio becomes 1, it means that the blood hemoglobin CO concentration becomes 10% which is the dangerous standard concentration. The value of the weighting ratio ER and the integrated value TR of the weighting ratio ER are added to the comparison / determination unit 14.

To the comparison / determination unit 14, one or more set reference values for CO safe operation corresponding to the integrated value TR of the weighting ratio ER can be added from the reference value setting unit 15.
The reference value setting unit 15 includes a reference value (air introduction reference value) for performing CO safety operation that introduces air outside the vehicle into the vehicle interior 3 through the blower 4, and each CO by alarm notification using a warning lamp or a buzzer. Reference value for safe operation (first and second alarm notification reference value) and reference value for CO safe operation (window opening for automatically opening window 10 of vehicle by adding window open signal to power window mechanism 9) An operation reference value) and a reference value for CO safe operation (engine off reference value) for confirming that the vehicle is not running and turning off the engine of the vehicle are given. Further, the reference value setting unit 15 is also provided with an ER upper limit determination reference value for performing all of the CO safety operations, corresponding to the weighting ratio ER.

The comparison and judgment unit 14 compares and judges the value of the weighting ratio ER added from the ratio calculation and integration unit 13 with the ER upper limit judgment reference value added from the reference value setting unit 15, and the ratio calculation and integration unit 13 is also provided. Function determination as safe operation signal output means for outputting a signal by comparing the integrated value TR of the weighting ratio ER added from the above with the reference value of each CO safe operation such as the air introduction reference value added from the reference value setting unit 15. To do. Specifically, when the integrated value TR of the weighting ratio ER reaches the air introduction reference value, an operation start signal is added to the air introduction control means 18, and similarly the integrated value TR becomes the first and second values.
When the alarm notification reference value is reached, the first and second operation start signals are added to the alarm output unit 19, respectively, and when the window opening operation start reference value is reached, the operation start signal is added to the window opening operation command means 20. When the engine off reference value is reached, an operation start signal is added to the engine off command means 21. Also,
When the value of the weighting ratio ER exceeds the ER upper limit determination reference value, the comparison / determination unit 14 causes the air introduction control unit 18, the alarm output unit 19, the window opening operation command unit 20, and the engine off command unit 21 to operate. Add operation start signal.

The air introduction control means 18 includes a ratio calculation and integration section 13
When the value of the weighting ratio ER calculated by means of exceeds a predetermined ER upper limit judgment reference value,
When the integrated value TR of the weighting ratio ER calculated by 13 reaches a predetermined air introduction reference value, the blower 4 of the automobile is turned on and the outside air introduction damper 6 is turned on.
Is opened to perform the CO safety operation of introducing the air outside the vehicle into the vehicle compartment 3 through the blower 4, and when the operation start signal is added from the comparison / determination unit 14, the blower 4 is operated.
Is turned on, the damper 6 for introducing the outside air is opened, and the air outside the vehicle is passed through the passage 5 for introducing the air and the blower 4 into the passenger compartment 3
To be introduced.

The alarm output unit 19 uses the ER to which the value of the weighting ratio ER calculated by the ratio calculation integration unit 13 is given in advance.
When the upper limit judgment reference value is exceeded, and when the integrated value TR of the weighting ratio ER calculated by the ratio calculation integration unit 13 reaches a preset alarm notification reference value, an alarm notification is given by a warning lamp, a buzzer, or the like. The CO safety operation is performed. When the first and second operation start signals are added from the comparison / determination unit 14, an alarm signal is output to the alarm device 22, and the first and second operation signals are output.
When the operation start signal is added, the warning lamp provided in the alarm device 22 is turned on, and when the second operation start signal is added, a buzzer alarm is issued.

The window opening operation command means 20 includes a ratio calculation and integration section 13
When the value of the weighting ratio ER calculated by the above exceeds a predetermined ER upper limit judgment reference value,
When the integrated value TR of R reaches a predetermined window opening operation start reference value, a window safety signal is added to the power window mechanism 9 of the vehicle to automatically perform the CO safety operation of opening the window 10 of the vehicle. The comparison and judgment unit 14
When an operation start signal is applied from the vehicle, it is confirmed that the vehicle speed detected by the vehicle speed sensor 23 is zero, a window open signal is applied to the power window mechanism 9, and the window 10 is opened by the power window mechanism 9. Let it open automatically.

The engine-off command means 21 determines that the value of the weighting ratio ER calculated by the ratio calculating / accumulating unit 13 is ER.
When the upper limit judgment reference value is exceeded and when the integrated value TR of the weighting ratio ER calculated by the ratio calculation integration unit 13 reaches the engine off reference value, it is confirmed that the vehicle is not running and the engine 24 of the vehicle is checked. When the operation start signal is applied from the comparison / determination unit 14, it is confirmed that the speed of the vehicle detected by the vehicle speed sensor 23 of the vehicle is zero. Stop engine 24. Further, the engine-off command means 21 performs the engine-off CO safety operation described above, and adds a temporary stop signal for the operation of the engine 24 to the attenuation correction section 16.

When receiving the temporary stop signal of the engine 24 from the engine off command means 21, the attenuation correction unit 16 performs attenuation correction on the integrated value of the weighting ratio immediately before the engine is stopped. That is, when the engine is temporarily stopped, the CO gas in the vehicle interior 3 leaks out through a slight gap during the combustion stop period, and the CO gas concentration in the vehicle interior 3 decreases. In order to take this into consideration, in the present embodiment, the integrated value TR of the weighting ratio before the engine is stopped is multiplied by the damping constant Q. This damping constant Q is expressed by the formula of e ^−Ktl , and K is an assumed number of ventilations per hour while the engine is stopped, and is given by a numerical value such as 0.2 by experience or the like. Further, tL is the time from when the engine is stopped until it is next reset and the operation of the engine 24 is started again. The attenuation correction unit 16 corrects the integrated value of the weighting ratio to a more realistic value.

The safety device 30 is provided with a power supply control circuit (not shown), and the operation of the safety device 30 is turned on / off by this power supply control circuit. Specifically, when the accessory key is turned on by the key operation of the automobile, the safety device 30 is activated, and when the accessory key is turned off, the safety device 30 is stopped in principle. It is supposed to do. However, even if the accessory key is turned off, if the integrated value TR of the weighting ratio ER calculated by the ratio calculation integrating unit 13 is not zero, this integrated value TR
The safety device 30 is controlled by the power supply control circuit so that the safety device 30 does not stop until is zero.

The present embodiment is configured as described above,
Next, the specific operation will be described with reference to the flowcharts of FIGS. First, in step 101 of FIG. 2, when the accessory key is turned on in step 102, the safety device 30 is turned on in step 103, the CO sensor 11 is turned on, and the CO sensor 11 is turned on.
Heat cleaning is performed. In this heat cleaning, the CO detection element of the CO sensor 11 is, for example, 500 ° C.
By heating up to such a high temperature, the adhered substances such as hydrocarbons adhering to the element are removed, thereby improving the detection accuracy of the CO gas concentration by the CO sensor 11. After completion of this heat cleaning, measurement of the CO gas concentration in the vehicle interior 3 by the CO sensor 11 is started.

Then, the detection result of the CO gas concentration by the CO sensor 11 is added to the unit time average CO detection unit 12 every moment, and in step 104, the unit time average CO detection unit.
The CO concentration per unit time is detected by 12, and this CO concentration is detected.
The density detection value is added to the ratio calculation integration unit 13, and the ratio calculation integration unit 13 calculates the weighting ratio ER and its integration value TR.
The calculation of is started.

Next, at step 105, the weighting ratio ER calculated by the ratio calculating / accumulating unit 13 by the comparison / determination unit 14 is calculated.
Value is compared with the ER upper limit judgment reference value set in the reference value selection unit 15, and when the ER value exceeds the ER upper limit judgment reference value, the process proceeds to step 106, where the alarm output unit 19 outputs the alarm signal. To turn on the warning lamp of the alarm device 22,
Buzzer alerts and air introduction control means
An operation start signal for introducing air is added to 18 to open the outside air introducing damper 6. Then, in step 107, it is judged whether or not the switch of the blower 4 is turned on. When the switch of the blower 4 is turned off, in step 108, the blower 4 is turned on.
The outside air is introduced into the vehicle compartment 3 via the blower 4 by turning on the switch.

Next, in step 109 of FIG. 3, after the window opening operation command means 20 confirms that the speed detected by the vehicle speed sensor 23 of the automobile is zero, step 110
Then, determine whether the car window 10 is open,
When is closed, in step 111, a window open signal is applied to the power window mechanism 9 to automatically open the window 10 by the power window mechanism 9 to fully open the window 10.

Next, in step 125, the engine off command means 21 confirms again that the speed detected by the vehicle speed sensor 23 of the automobile is zero, and in step 126, S
After confirming that the T flag is not 1 (ST flag is not set), the engine 24 is turned off in step 127, and the ST flag is set to 1 in step 128.

The ST flag is not caused by the backflow of exhaust gas from the engine 24 of the automobile. For example, when the automobile is running in the tunnel, CO gas is emitted in the tunnel due to an accident in the tunnel. Filled with CO
When the gas is introduced into the passenger compartment 3 of the automobile and is detected by the CO sensor 11, the engine off command means 21 turns off the engine 24 of the automobile and the automobile escapes from the tunnel. This is set in order to prevent a trouble such as being unable to do so. After the engine-off command means 21 finishes the engine-off CO safety operation once and the engine 24 is stopped once, the ST flag is set. At this time, when a key operation is further performed by a person and the engine 24 is turned on, the engine 24 is immediately started even if the value of the weighting ratio ER or the like is high.

When it is determined in step 105 of FIG. 2 that the value of the weighting ratio ER does not exceed the ER upper limit determination reference value, it is determined in step 112 whether or not the accessory key is turned on, and the accessory key is turned on. When it is confirmed that is turned on, the routine proceeds to step 113.
On the other hand, if it is determined in step 112 that the accessory key is off, the process proceeds to step 129, in which case the warning lamp of the alarm device 22 is on or the buzzer warns the operator, Is turned off, and the attenuation correction unit 16 subtracts the integrated value TR in step 130.

In step 113, the weighting ratio ER
It is determined whether or not the TR flag that is set when the integrated value TR of 1 exceeds 1 (TR flag = 1). When the TR flag is 1, the warning lamp is turned on by the alarm device 22 in step 129. And a warning is issued by a buzzer, and when it is determined that the TR flag is not set, the routine proceeds to step 114.

At step 114, it is judged if the integrated value TR of the weighting ratio ER has reached 0.7. This 0.
The value of 7 is previously given to the reference value setting unit 15 as the air introduction reference value, and when the value of TR is less than 0.7, it is confirmed in step 132 whether the accessory key is ON, When the accessory key is on in step 132, the routine proceeds to step 146, and when the accessory key is off, the routine proceeds to step 130, where the integrated value TR is subtracted.

If it is determined in step 114 that the integrated value TR is 0.7 or more, it is determined that the blood hemoglobin CO concentration has reached the air introduction reference value.
An operation start signal is applied from the comparison / determination unit 14 to the air introduction control means 18, and in step 115, the air introduction control means 18 opens the outside air introduction damper 6 so that the air outside the vehicle can be introduced into the vehicle interior 3. In Step 116, it is judged whether or not the switch of the blower 4 is turned on. When the blower 4 is turned off, the switch of the blower 4 is turned on in Step 132 and air is blown from the air introduction passage 5 through the blower 4. Install and go to step 117.

In step 117, the weighting ratio ER
It is judged whether the integrated value TR of is 0.8 or more. This 0.8
Is the value set in the reference value setting unit 15 as the first alarm notification reference value, and in step 117, the integrated value TR
If it is determined that the value of has not reached 0.8, proceed to step 134, and in step 134, determine whether the accessory key is on. If the accessory key is on, return to step 117 again to access the accessory key. When is off, proceed to step 146. Meanwhile, step 11
When it is determined in step 7 that the integrated value TR is 0.8 or more, it is determined that the blood hemoglobin CO concentration has reached the first alarm notification reference value. Therefore, in step 118, the alarm output unit 19 The warning lamp of the warning device 22 is turned on by the output of the warning signal.

Next, in step 119 of FIG. 3, the integrated value TR
A determination is made as to whether the value of is 0.9 or greater. The value of 0.9 is previously given to the reference value setting unit 15 as the second alarm notification reference value and the window opening operation reference value,
If it is determined in step 119 that the integrated value TR is less than 0.9, it is determined in step 135 whether or not the accessory key is on. If the accessory key is off, in step 136 the warning lamp is turned on. Is turned off, and the routine proceeds to step 116. Also, step 135
If it is determined that the accessory key is on, the process returns to step 119.

In step 119, the integrated value TR is
When it is determined that the value is 0.9 or more, it is determined that the blood hemoglobin CO concentration has reached the second alarm notification reference value. Therefore, in step 120, the alarm signal is output from the alarm output unit 19, and the alarm device 22 is output. The buzzer of is turned on, and an alarm is issued by the buzzer. Further, at this time, to ensure that the air introduction operation by the air introduction control means 18 is performed,
The operations of step 120, step 121, and step 137 are performed.

Next, at step 122, window opening operation command means
If the speed detected by the vehicle speed sensor 23 of the automobile is zero by 20 and if the speed is determined to be zero, it is determined in step 138 whether the window 10 of the automobile is open, When the window 10 is closed, the window opening operation command means 20 applies a window opening signal to the power window mechanism 9 to automatically open the window 10 of the automobile at step 139. And when it is determined in step 138 that the vehicle window 10 was open, and
If the window 10 is fully opened at 139, step 12
Go to 3.

In step 123, it is determined whether the integrated value TR of the weighting ratio ER has become 1.0 or more.
The value of 1.0 is previously given to the reference value setting unit 15 as the engine off reference value, and the value of the integrated value TR is
If the value is less than 1.0, in step 114, it is determined whether or not the accessory key is on.If the accessory key is off, in step 141, the warning lamp and buzzer of the alarm device 22 are turned off, and in step 140, When it is determined that the accessory key is on, the process returns to step 123 again. Further, in step 123, the integrated value TR is 1.
If it is judged to be 0 or more, it is judged that the blood hemoglobin CO concentration has reached the engine-off reference value and is in an extremely dangerous state. Therefore, in step 124, the TR flag is set (TR flag is set to 1), and the step is executed. Go to 125
As in the case where the value of the weighting ratio ER exceeds the ER upper limit judgment reference value, the operations of steps 125 to 127 are performed to confirm that the vehicle is not running and then stop the engine 24.

As described above, the engine-off command means
When the engine 24 of the automobile is stopped by 21, in step 144, it is determined whether or not the engine 24 is turned on. When the engine is stopped, in step 14
At 5, the attenuation correction unit 16 performs TR subtraction. Then, in step 142, it is judged again whether or not the accessory key is on. When the accessory key is on, the process returns to step 125, and when the accessory key is off,
In step 143, the buzzer and warning lamp of the alarm device 22 are turned off, the ST flag is set to zero, and the routine proceeds to step 146 in FIG.

At step 146, it is judged whether or not the integrated value TR of the weighting ratio ER becomes zero, and the series of operations from step 105 to step 145 are repeated until TR becomes zero, and the integrated value TR becomes zero. If it becomes, proceed to step 147, confirm that the accessory key is off in step 147, and confirm in step 149 that CO
The power of the sensor 11 is turned off, the TR flag is also set to zero, and the safety device 30 including the CO sensor 11 is also turned off until the accessory key of the vehicle is turned on at the time of next driving of the vehicle. . If it is determined in step 147 that the accessory key is on, the TR flag is set to zero in step 148 and step 10 is performed again.
Returning to step 5, in step 147, the operations from step 105 to step 146 are repeated until the accessory key is turned off.

According to this embodiment, CO
The weighted ratio ER of the detected CO concentrations and the integrated value TR thereof are calculated for each unit detection time t of the gas concentration, and the blood hemoglobin CO concentration of each CO safe operation is calculated based on the weighted ratio ER and the integrated value TR thereof. It is judged whether or not the reference value is reached, and based on this judgment result, the corresponding CO
In order to perform a safe operation, accurately determine the dangerous state of blood hemoglobin CO concentration of the person in the vehicle interior 3, and make the safety measure against CO gas poisoning of the person in the vehicle interior 3 very accurate. Therefore, the carbon monoxide poisoning accident of the person in the vehicle interior 3 can be reliably prevented.

When the engine off command signal is output to temporarily stop combustion of the engine 24, the integrated value TR of the weighting ratio before the engine is stopped is attenuation-corrected, and the attenuation-corrected weighting is performed. Since the weighted ratio for each unit detection time t after the start of combustion is integrated based on the integrated value of the ratio, the blood hemoglobin CO
The dangerous state of the concentration is judged, and the reliability of the safe operation of CO gas poisoning is also enhanced.

The present invention is not limited to the above-mentioned embodiment, and various embodiments can be adopted. For example, in the above embodiment, the dangerous standard concentration of hemoglobin CO concentration in blood is
Although it is set as 10%, this dangerous standard concentration can be arbitrarily set with other different concentration values.

Further, although the unit time t for detecting the CO concentration is 10 seconds in the above-mentioned embodiment, this time can be set arbitrarily, and in the above-mentioned embodiment, the CO concentration sampled every 1 second. Although the detected values of the sensor are averaged and the average value is used as the CO concentration, the present invention is not necessarily limited to the embodiment.

Further, in the above-mentioned embodiment, the reference value of CO safe operation is given by the blood hemoglobin CO concentration, and the blood hemoglobin CO concentration is calculated by the ratio calculating / integrating unit 13 and the weighted ratio ER and its integrated value. As TR, for example, TR = 0.7 is used as the air introduction reference value, and T
Although R = 0.8 was used as the first alarm notification reference value, for example, T
R = 0.6 may be used as the air introduction reference value, and the reference value of each CO safe operation corresponding to the value of TR is appropriately set.

Further, the set reference value for each CO safe operation is not necessarily the blood hemoglobin C as in the above embodiment.
It is not always given by the O concentration, but the set reference value for each CO safe operation is set corresponding to the CO gas concentration detected by the CO sensor 11, and the CO gas concentration has reached the preset air introduction reference value. Occasionally, a CO safety operation for air introduction by the air introduction control means is performed, and when the CO gas concentration reaches a predetermined alarm notification reference value, a CO safety operation by alarm notification is performed to open a window with a predetermined CO gas concentration. When the operation start reference value is reached, a CO safety operation for automatically opening the window of the automobile is performed, and when the CO gas concentration reaches a predetermined engine off reference value,
Make sure the car is not running
The CO safe operation corresponding to the set reference value may be performed, such as the CO safe operation of turning off 24.

Further, in the above embodiment, the CO safety operation by the alarm notification is performed separately by the warning lamp and the buzzer provided in the alarm device 22, but the CO safety operation by the alarm notification is performed by the warning lamp and the buzzer. They may be simultaneously performed by both, and the alarm notification may be performed by another means other than the warning lamp and the buzzer.

Further, in the above embodiment, a plurality of reference values such as the air introduction reference value are set as the setting reference values for the CO safe operation, but the number of setting reference values may be one, and when a plurality of setting values are set. However, the number of settings is appropriately set.

Further, the exhaust gas backflow safety device for an automobile of the present invention is applied to all types of automobiles, and is widely applied as a safety device for various automobiles against carbon monoxide gas due to exhaust gas backflow. It is something.

[0059]

According to the present invention, the CO gas concentration in the passenger compartment of the automobile is detected by the CO detection sensor, and based on the detected CO gas concentration, or the detected C gas concentration.
Based on the blood hemoglobin CO concentration when exposed to an atmosphere of O gas concentration, these concentrations were given in advance 1
When one or more CO safe operation set reference values are reached, corresponding to each set reference value, a CO safe operation of introducing air outside the vehicle into the vehicle compartment through a blower, or a CO safe operation by alarm notification CO that automatically opens car windows
Since the safe operation and the CO safe operation of turning off the engine of the automobile are performed respectively, it becomes possible to perform an accurate CO safe operation against a dangerous state due to the CO gas concentration. It is possible to prevent gas poisoning accidents.

The CO detected by the CO detection sensor
Based on the gas concentration, a blood CO concentration calculating means for calculating the blood hemoglobin CO concentration when exposed to the atmosphere of the detected CO gas concentration is provided, and the reference value of the CO safe operation is set to the blood hemoglobin CO concentration. A reference value setting unit provided by the reference value setting unit is provided, and the CO safe operation corresponding to when the blood hemoglobin CO concentration calculated by the blood CO concentration calculating unit reaches the reference value of the CO safe operation given to the reference value setting unit. According to the present invention configured to perform, by performing the CO safe operation based on the hemoglobin CO concentration in blood,
It is possible to make a more accurate and highly accurate risk judgment on the CO concentration, and it is possible to further enhance the safety against CO gas poisoning.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of an automobile exhaust gas backflow safety device according to the present invention.

FIG. 2 is a flowchart showing a safe operation of the embodiment.

FIG. 3 is a flowchart showing a safe operation following FIG.

FIG. 4 is a simulation graph showing an increasing state of blood hemoglobin CO concentration when a constant concentration of CO gas is continuously supplied to the closed chamber.

FIG. 5 is graph data for obtaining a time T at which the blood hemoglobin CO concentration reaches a dangerous standard concentration when exposed to a predetermined concentration of CO gas.

FIG. 6 is a graph showing the relationship between CO concentration in air and hemoglobin CO concentration in blood.

FIG. 7 is a schematic explanatory diagram of an external air introduction and vehicle interior air circulation operation of a general vehicle.

[Explanation of symbols]

 11 CO sensor 14 Comparison judgment part 15 Reference value setting part 18 Air introduction control means 19 Alarm output part 20 Window opening operation command means 21 Engine off command means

Claims (6)

[Claims] 1. A C for detecting CO gas in a passenger compartment of an automobile.
An O detection sensor is provided, and the CO gas concentration in the vehicle compartment detected by the CO detection sensor is one or more CO
An exhaust gas backflow safety device for an automobile, comprising: a safe operation signal output means for outputting a signal corresponding to the set reference value for the safe operation. 2. An air introduction reference value is given as a set reference value, and when the CO gas concentration detected by the CO detection sensor reaches the air introduction reference value, the blower of the automobile is turned on and the outside air introduction is performed. 2. The exhaust gas backflow safety device for an automobile according to claim 1, further comprising an air introduction control means for performing CO safety operation for opening the damper to introduce the air outside the automobile into the interior of the vehicle through a blower. 3. An alarm notification reference value is provided as a set reference value, and an alarm means is provided for performing CO safety operation by alarm notification when the CO gas concentration detected by a CO detection sensor reaches the alarm notification reference value. The exhaust gas backflow safety device for an automobile according to claim 1 or 2, characterized in that. 4. An automobile is provided with a power window mechanism for automatically opening a window in response to a window opening signal, and a window opening operation start reference value is given as a set reference value to detect CO. When the CO gas concentration detected by the sensor reaches the window opening operation start reference value, a window opening operation command means for applying a window opening signal to the power window mechanism to automatically open the window of the automobile to perform a CO safety operation. The exhaust gas backflow safety device for an automobile according to claim 1, 2 or 3, further comprising: 5. An engine-off reference value is given as a set reference value, and when the CO gas concentration detected by a CO detection sensor reaches the engine-off reference value, it is confirmed that the vehicle is not running and the The exhaust gas backflow safety device for an automobile according to any one of claims 1 to 4, further comprising an engine off command means for performing a CO safety operation for turning off the engine. 6. A blood CO concentration calculating means for calculating the blood hemoglobin CO concentration when exposed to an atmosphere having the detected CO gas concentration based on the CO gas concentration detected by the CO detection sensor, A CO safety operation in which a reference value setting unit that gives a setting reference value for CO safe operation by blood hemoglobin CO concentration is provided, and the blood hemoglobin CO concentration calculated by the blood CO concentration calculating means is given to the reference value setting unit. Corresponding CO when the set reference value of
The exhaust gas backflow safety device for an automobile according to any one of claims 1 to 5, which is configured to perform a safe operation.