JP5437844B2 - In-vehicle carbon dioxide concentration increase determination device and in-vehicle safety support system - Google Patents

Description

  The present invention relates to an in-vehicle carbon dioxide concentration increase determination device and an in-vehicle safety support system that determine the cause of an increase in the concentration of carbon dioxide in a vehicle.

  In a vehicle, alarming according to the concentration of carbon dioxide in the air in the vehicle or controlling an air conditioner has been conventionally performed (see Patent Document 1). As shown in FIG. 9, the vehicle air conditioner shown in Patent Document 2 and the like has a refrigerant leaking when the CO2 concentration detected by the carbon dioxide (CO2) sensor exceeds a reference determination threshold P. It is known to perform judgment by issuing a warning while switching between the inside and outside air. As an example of air conditioning control, the control is performed so that the inside air circulation is performed when the CO2 concentration is lower than the threshold value P, and the outside air suction is performed when the CO2 concentration is equal to or more than the threshold value P.

JP 2004-26087 A JP 2008-290701 A

  However, in the conventional method for determining abnormality of CO2 concentration, when the CO2 concentration exceeds the threshold value P, ventilation in the vehicle is forcibly performed. The pull-in of passengers, exhalation of passengers, etc. However, if the inside of the vehicle is forcibly ventilated, the vehicle air conditioner operates suddenly, which causes a problem that surprises the driver.

  Also, factors that increase the CO2 concentration in the vehicle include CO2 leakage from the air conditioning, intake of exhaust gas, and expiration of occupants. However, since it is difficult to specify these factors, it is necessary to set the threshold value lower in consideration of the risk of human life, and the frequency of ventilation increases. In addition, when the blower is driven for ventilation, energy is consumed, making it difficult to contribute to energy saving.

  Therefore, in view of the above-described problems, the present invention provides an in-vehicle carbon dioxide concentration increase determination device and an in-vehicle safety support system that can quickly determine whether the increase in carbon dioxide concentration is due to occupant expiration. The challenge is to do.

  In order to solve the above-mentioned problem, the in-vehicle carbon dioxide concentration increase determining device according to claim 1 according to the present invention, as shown in the basic configuration diagram of FIG. 1, determines in-vehicle carbon dioxide concentration increase causes in the vehicle. A carbon concentration increase determination device, which is set faster than a first increase rate of carbon dioxide concentration due to exhalation in the vehicle, and at least one of blowing of exhalation to the carbon dioxide sensor and drawing of exhaust gas into the vehicle Discriminating the discriminating condition information having an ascending rate condition set slower than the second ascending rate of the carbon dioxide concentration due to and a duration condition satisfying the ascending rate condition for determining that the concentration rises due to exhalation Concentration information acquisition means for acquiring the concentration information of carbon dioxide in the vehicle detected by the condition information storage means D1 and the carbon dioxide sensor Based on P1 and the acquired concentration information, the rising speed detecting means P2 for detecting the rising speed of the concentration satisfying the rising speed condition, and the duration time of the detected rising speed satisfies the duration condition In addition, determination means P3 for determining that the carbon dioxide concentration is increased due to exhalation, and warning information for warning that the determination means P3 has determined that the carbon dioxide concentration is increased due to exhalation are provided to the passengers in the vehicle. And an alarm information output means P4 for outputting.

  According to the in-vehicle carbon dioxide concentration increase determination device of the present invention described in claim 1, the determination condition information storage means D1 stores determination condition information corresponding to the vehicle class, the size in the vehicle, and the like. . The rising speed condition is set to, for example, a threshold value or less and a predetermined speed range, and the duration condition is set to a threshold value or more, for example, a duration range. When the density information is acquired by the density information acquisition means P1, the rising speed of the density that satisfies the rising speed condition is detected by the rising speed detection means P2 based on the density information. When the duration of the detected rising speed satisfies the duration condition, it is determined by the determining means P3 that the carbon dioxide concentration has increased due to exhalation, and the alarm information is output to the passenger in the vehicle by the alarm information output means P4. Displayed, voice, etc.

  According to a second aspect of the present invention, as shown in the basic configuration diagram of FIG. 1, in the in-vehicle carbon dioxide concentration increase determining device according to the first aspect, the determining means P3 is configured such that the duration time of the detected rising speed is A means for discriminating that the carbon dioxide concentration has increased due to a factor other than the exhalation when the duration condition has been deviated, and the discriminating means P3 has determined that the carbon dioxide concentration has increased due to a factor other than the exhalation; A ventilation request output means P5 for outputting a ventilation request for requesting ventilation in the vehicle to a predetermined request destination after outputting notice information for notifying the start of ventilation in the vehicle to the occupant. It is characterized by.

  According to the in-vehicle carbon dioxide concentration increase determination device of the present invention described in claim 2 above, when the duration of the detected increase speed deviates from the duration condition, the determination means P3, for example, a refrigerant for air conditioning other than exhalation It is determined that carbon dioxide has risen due to factors such as leakage and exhaust gas entrainment. Then, after the notice information is output to the occupant by the ventilation request output means P5, the ventilation request is output to the request destination.

  In order to solve the above problems, the in-vehicle safety support system according to claim 3 according to the present invention is provided in the in-vehicle safety support system 100 having the ventilation device 2 for ventilating the inside of the vehicle as shown in the basic configuration diagram of FIG. Item 2. The in-vehicle carbon dioxide concentration increase determination device 1 according to Item 2, wherein the ventilation request output means P5 sets the request destination to the ventilator 2, and the ventilation apparatus 2 receives ventilation from the ventilation request output means P5. Special feature is to ventilate the vehicle according to demand.

  According to the in-vehicle safety support system of the present invention described in claim 3, when the duration of the detected ascending speed satisfies the duration condition, the alarm information is output to the passenger in the vehicle by the alarm information output means P4. Output by display, audio, etc. In addition, when the detected duration of the rising speed deviates from the duration condition, after the advance notice information is output to the occupant, the ventilation request is output by the ventilation request output means P5 of the in-vehicle carbon dioxide concentration increase determination device 1. When output to 2, the ventilator 2 ventilates the interior of the vehicle.

  As described above, according to the first aspect of the present invention, since the increase in the carbon dioxide concentration due to exhalation is discriminated by paying attention to the rate of increase, conventional forced ventilation is started. Before reaching the determination threshold, it can be quickly determined whether or not the increase in the carbon dioxide concentration is due to the expiration of the occupant. In addition, when the duration of the detected rising speed satisfies the duration condition, it is determined that the carbon dioxide concentration is rising due to expiration, and alarm information is output to the occupant. Ventilation inside the vehicle can be promoted, and a decrease in the necessity for forced ventilation can be expected. Therefore, since the necessity for forcibly operating the air conditioner and the like can be reduced, the frequency at which the air conditioner and the like suddenly operate and surprise the passenger can be reduced, and it can contribute to energy saving. .

  According to the invention described in claim 2, in addition to the effect of the invention described in claim 1, when the detected duration of the rising speed deviates from the duration condition, the notice information is output to the occupant. Later, because the ventilation request was output to the requestee, if there is a danger to human life, the passenger can be ventilated after notifying the passenger of the start of ventilation and then starting the ventilation operation. You can prevent surprises.

  As described above, according to the third aspect of the present invention, since the increase in the carbon dioxide concentration due to exhalation is discriminated by paying attention to the rate of increase, conventional forced ventilation is started. Before reaching the determination threshold, it can be quickly determined whether or not the increase in the carbon dioxide concentration is due to the expiration of the occupant. In addition, when the duration of the detected rising speed satisfies the duration condition, it is determined that the carbon dioxide concentration is rising due to expiration, and alarm information is output to the occupant. Ventilation inside the vehicle can be promoted, and a decrease in the necessity for forced ventilation can be expected. Therefore, since the necessity for forcibly operating the air conditioner and the like can be reduced, the frequency at which the air conditioner and the like suddenly operate and surprise the passenger can be reduced, and it can contribute to energy saving. . Further, when there is a danger to human life, the passenger can be ventilated after notifying the occupant of the start of ventilation, so that the occupant can be prevented from being surprised by the start of the ventilation operation.

1 is a configuration diagram illustrating a basic configuration of an in-vehicle carbon dioxide concentration increase determination device and an in-vehicle safety support system according to the present invention. 1 is a configuration diagram showing a schematic configuration of an in-vehicle safety support system according to the present invention. It is a front view which shows an example of meter ECU to which the in-vehicle carbon dioxide concentration rise discrimination device of the present invention is applied. 1 is a system configuration diagram illustrating an example of a schematic configuration of a vehicle carbon dioxide concentration increase determination device according to the present invention. It is a graph for demonstrating the discrimination | determination example of the density | concentration rise by exhalation from the relationship between CO2 density | concentration and elapsed time. It is a flowchart which shows an example of the density | concentration raise discrimination | determination process which concerns on this invention which CPU in FIG. 4 performs. It is a figure for demonstrating an example of alarm information. It is a figure for demonstrating an example of notice information. It is a graph for demonstrating switching of the inside and outside air by the conventional air conditioning apparatus.

  Hereinafter, an embodiment in which the in-vehicle carbon dioxide concentration increase determination device according to the present invention is applied to a meter ECU incorporated in an in-vehicle safety support system will be described below with reference to the drawings in FIGS. .

  In FIG. 2, the in-vehicle safety support system 100 is mounted on a vehicle such as a passenger car or a truck. The in-vehicle safety support system 100 includes a meter ECU (Electronic Control Unit) 1, an air conditioner ECU 2, and a carbon dioxide (CO 2) sensor 5. The meter ECU 1 and the air conditioner ECU 2 are communicably connected to the vehicle network 3. In the present embodiment, a case where the communication protocol in the vehicle network 3 is a known CAN (Controller Area Network) will be described, but various communication protocols such as LIN (Local Interconnect Network) can be employed.

  First, the air conditioner ECU 2 is a vehicle air conditioner described in Patent Document 2 and the like described above. The air conditioner ECU 2 calculates a necessary blowing temperature and controls a servo motor, a blower motor and the like, and determines whether or not the carbon dioxide concentration exceeds a predetermined reference value based on the output signal of the CO 2 sensor 5. When the carbon dioxide concentration is abnormally high, the alarm device, servo motor and blower motor are controlled. Then, the air conditioner ECU 2 drives the inside / outside air switching door by the servo motor to selectively open and close the inside air introduction port for introducing the inside air and the outside air introduction port for introducing the outside air to switch between the inside air circulation and the outside air suction. Yes.

  The CO2 sensor 5 is provided in the vehicle, in the case of the air conditioner ECU 2, and the like, detects the concentration of CO2, and outputs a concentration signal indicating the concentration. When the CO2 sensor 5 is provided in the vehicle, it is disposed near the feet of the passenger on the passenger seat, below the passenger seat, and the like. A plurality of CO2 sensors 5 may be provided in the vehicle.

  The meter ECU 1 is a known combination meter, and as shown in FIGS. 3 and 4, a plurality of instruments 20 that display measured values such as vehicle speed, engine rotation, fuel remaining amount, temperature, and the like, and a liquid crystal display (LCD) ) 30 and a plurality of warnings 40. As is well known, the meter ECU 1 is provided with a turnback 10a between the plurality of meters 20 and the LCD 30, and is placed in front of the driver's seat of the vehicle in a state of covering them with the front glass 10b. Yes.

  As is well known, each of the plurality of meters 20 has a dial having a scale and indicators such as numbers, letters, symbols, etc. on the surface, a pointer disposed on the front face of the dial, and a measurement amount. And an internal unit that drives the pointer. As shown in FIG. 3, the plurality of meters 20 of the present embodiment includes a speedometer (SPEED) 20 a and a tachometer (REV) 20 b.

  As shown in FIG. 4, the meter ECU 1 includes a central processing unit (CPU) 11, a read only memory (ROM) 12, a random access memory (RAM) 13, an EEPROM 14, and a communication unit 15. Yes.

  The CPU 11 controls the entire meter ECU 1 and performs control according to a program stored in the ROM 12. The CPU 11 operates with electric power supplied from the vehicle battery via the power supply circuit 11b. The CPU 11 is activated in response to the change of the ignition switch (IGN +) of the vehicle from the OFF state to the ON state via the interface (I / F) 11i, and operates according to the change of the IGN + from the ON state to the OFF state. finish.

  The CPU 11 is electrically connected to the CO2 sensor 5 via the I / F 11i. When the concentration signal is input from the CO2 sensor 5, the CPU 11 acquires the concentration of CO2 indicated by the signal as concentration information.

  The ROM 12 causes the CPU 11 to function as various means such as the concentration information acquisition means P1, the ascending speed detection means P2, the discrimination means P3, the alarm information output means P4, and the ventilation request output means P5 in the claims shown in FIG. Stores a density rise discrimination program and the like. By executing the concentration increase determination program, the CPU 11 functions as various means such as concentration information acquisition means P1, increase speed detection means P2, determination means P3, alarm information output means P4, and ventilation request output means P5. Become.

  The RAM 13 stores various data and has an area necessary for processing operations of the CPU 11. The EEPROM 14 is an electrically erasable / rewritable read-only memory, and is electrically connected to the CPU 11. The EEPROM 14 has a storage area capable of storing a plurality of concentration information acquired from the CO2 sensor 5 in a time series over a predetermined time.

  The communication unit 15 is communicably connected to an in-vehicle network 3 such as a CAN built in a vehicle via the I / F 11i, and communicates with other electronic devices connected to the in-vehicle network 3 using a communication protocol such as CAN. Do. The communication unit 15 transmits information input from the CPU 11 to the transmission destination, and outputs information received from other electronic devices to the CPU 11.

  A motor driver 16 and an LCD driver 17 are electrically connected to the CPU 11. The motor driver 16 is electrically connected to two instruments 2, a speedometer 20 a and a tachometer 20 b. The motor driver 16 drives the internal unit (motor) of each meter 2 under the control of the CPU 11. Thereby, each measuring instrument 2 rotates the pointer to the indicated position corresponding to the measured amount, and displays the measured amount in cooperation with the dial index.

  An LCD 30 is electrically connected to the LCD driver 17 and is driven under the control of the CPU 11. The LCD 30 is configured to be able to display information according to a request from the CPU 11. In the present embodiment, a case where the LCD driver 17 causes the LCD 3 to display alarm information requested from the CPU 11 will be described.

  Next, the discrimination condition information of the present invention will be described below with reference to the drawing of FIG. The determination condition information is determined in advance according to the type of vehicle, class, vehicle interior volume, and the like.

  The determination condition information is set to be faster than the first increase rate V1 of the carbon dioxide concentration due to the exhalation in the vehicle, and the carbon dioxide concentration by at least one of the blowing of exhalation to the CO2 sensor 5 and the drawing of the exhaust gas into the vehicle And a rising speed condition V set later than the second rising speed V2 and a duration condition T that satisfies the rising speed condition for determining that the concentration is increased due to exhalation.

  Here, an example of details of the discrimination condition information will be described below. The ascending speed condition V and the measurement time condition T in the determination condition information will be described based on the case of presetting from an experimental result using an actual vehicle, for example, but may be set from a simulation result or the like.

  The graph shown in FIG. 5 shows the result of actually measuring the CO2 concentration by providing the CO2 sensor 5 in a 1500 cc class small passenger car. In FIG. 5, the vertical axis represents the CO2 concentration [ppm], and the horizontal axis represents the elapsed time [sec] since the measurement of the CO2 concentration was started. And graph G1 has shown the result of having measured the rise in CO2 concentration by the exhalation in a car, when four crew members get on a vehicle. The rising speed of the graph G1 indicates the first rising speed V1, which is 2 ppm / sec.

  Graph G2 shows the result of measuring the rise in CO2 concentration in the vehicle when exhaust gas is drawn into the vehicle, and the rate of increase is 270 ppm / sec. Graph G3 shows the result of measuring the increase in the CO2 concentration in the vehicle when the CO2 sensor 5 is blown, and the rate of increase is 80 ppm / sec. The rising speeds of the graphs G2 and G3 indicate the second rising speed V2. In the present embodiment, the case where both the graphs G2 and G3 are used will be described, but instead, for example, only the slower one of the rising speeds of the graphs G2 and G3 is set as the second rising speed V2. It can also be set as embodiment.

  A graph G4 indicates a graph corresponding to 4 ppm / sec, which is a rising speed condition V determined in advance based on the above-described graphs G1 to G3. Here, since the graph G3 is blowing exhalation, as shown in FIG. 5, the CO2 concentration increases at first, but gradually decreases after reaching the peak. It is preferable to set so that it can be distinguished from the graph 3.

  When the result of FIG. 5 is obtained, in order to determine that the concentration has increased due to expiration, the graph G3 pays attention to the fact that the CO2 concentration has decreased from around 30 seconds before, and the duration condition T is set to 30 seconds. doing. Therefore, in FIG. 5, when the rising speed smaller than 4 ppm / sec of the rising speed condition V continues for 30 seconds or more which is the measurement time condition T, it can be determined that the CO2 concentration is increased due to expiration. That is, since it can be determined that there is a low possibility of developing a human life risk, it is only necessary to encourage the occupant to ventilate. On the other hand, when the rate of increase of 4 ppm / sec or more continues for 30 seconds or more, it can be determined that the CO2 concentration has increased due to the occurrence of exhaust gas drawing, refrigerant leakage of air conditioning, or the like. That is, since it can be determined that there is a high possibility of developing into a human life risk, the air conditioning inside / outside air damper switching, the opening / closing of the vehicle window, and the like are forcibly performed.

  Accordingly, the discrimination condition information corresponding to the measurement result shown in FIG. 5 indicates that abnormalities due to exhalation occur when the increase in CO2 concentration is in the range of 2 ppm / sec or more smaller than 4 ppm / sec and the rate of increase in the range continues for 30 sec or more. This is information for determining that the increase in CO2 concentration continues for 4 ppm / sec or more and 30 sec or more as an abnormality other than exhalation. In this embodiment, since the determination condition information is stored in the EEPROM 14 in advance, the EEPROM 14 functions as the determination condition information storage means in the claims. The ascending speed condition V may be set to an ascending speed generally lower than 4 ppm / sec, or may be set to 4 ppm / sec ± error. In other words, various embodiments can be made according to the rising characteristics of the CO2 concentration in the vehicle.

  Next, an example of the density increase determination process executed by the CPU 11 described above will be described below with reference to the flowchart of FIG. It is assumed that the density increase determination process is called from the host process at a predetermined timing, and ends the process in response to the end request.

  When the CPU 11 executes the concentration increase determination program, in step S11 (corresponding to concentration information acquisition means), the CPU 11 acquires the concentration indicated by the concentration signal input from the CO2 sensor 5 as concentration information at a predetermined sampling interval. The density information and the detection time are associated with each other and stored in the EEPROM 14 in time series, and then the process proceeds to step S12.

  In step S12 (corresponding to ascending rate detecting means), the CPU 11 detects the ascending rate based on the density information in the EEPROM 14, stores it in the RAM 13, and then proceeds to the processing of step S13. As an example of the method for detecting the rising speed, there is a method for detecting the rising speed after the CO2 concentration starts to rise or the rising speed per unit time after the CO2 concentration starts to rise. It is done.

  In step S <b> 13, the CPU 11 compares the ascending speed of the RAM 13 with the ascending speed condition V of the EEPROM determination condition information to determine whether or not the ascent speed condition V is satisfied. In the present embodiment, it is determined whether the ascending speed condition V is less than 4 ppm / sec and 2 ppm / sec or more.

  If the CPU 11 determines that the ascent speed condition V is satisfied (Y in S13), the CPU 11 detects the duration time that satisfies the ascent speed condition V in step S14, and then proceeds to the processing in step S15. Note that examples of the method for detecting the duration include a method of detecting the duration based on the density information and the detection time, and detecting based on the sampling interval described above.

  In step S15 (discriminating means), the CPU 11 compares the detected duration with the duration condition T of the EEPROM discriminating condition information to determine whether or not it is an increase due to expiration. If the CPU 11 determines that the duration does not continue for the duration time T or more, that is, it is not an increase due to expiration (N in S15), the CPU 11 returns to the process of step S11 and repeats a series of processes. On the other hand, when it is determined that the CPU 11 continues over the duration time T or more, that is, it is an increase due to expiration (Y in S15), the CPU 11 proceeds to the process of step S16.

  In step S16 (alarm information output means), the CPU 11 outputs the alarm information for displaying the alarm screen M1 shown in FIG. 7 on the LCD 30 to the LCD driver 17 and requests the display to display the alarm screen M1 on the LCD 30. After that, the process returns to step S11 to repeat a series of processes. The warning information of this embodiment is a content that displays a comment that prompts the occupant to ventilate, such as “the vehicle interior CO2 concentration warning concentration is a warning level. ing. The alarm screen M1 may be automatically deleted after a predetermined display time has elapsed, or may be deleted in accordance with a predetermined operation by the occupant. Further, the alarm screen M1 may be displayed and an alarm sound or an alarm sound may be output.

  Further, when the CPU 11 determines that the ascent speed condition V is not satisfied in step S13 (N in S13), the CPU 11 determines whether or not the ascent speed is equal to or higher than the ascent speed condition V in step S17. If the CPU 11 determines that it is not equal to or higher than the ascending speed condition V (N in S17), the CPU 11 returns to the process of step S11 and repeats a series of processes. On the other hand, if the CPU 11 determines that it is equal to or higher than the ascending speed condition V (Y in S17), the CPU 11 detects the duration of the ascending speed exceeding the ascending speed condition V as described above and stores it in the RAM 13 in step S18. Thereafter, the process proceeds to step S19.

  In step S19, the CPU 11 compares the detected duration with the duration condition T of the EEPROM discriminating condition information, and determines whether the increase is due to something other than exhalation. In the present embodiment, the case where the same duration condition T is used for determination of expiration or non-expiration will be described. However, instead of this, different durations may be used. When the CPU 11 determines that the increase is not due to exhalation (N in S19), the CPU 11 returns to the process of step S11 and repeats a series of processes.

  On the other hand, if the CPU 11 determines that the increase is due to something other than exhalation (Y in S19), in step S20 (corresponding to the ventilation request output means), the CPU 11 outputs notice information for announcing the start of ventilation in the vehicle to the LCD driver 17. By requesting the display, the notice screen M2 shown in FIG. 8 is displayed on the LCD 30, and then the process proceeds to step S21. The notice information of the present embodiment is information for causing the LCD 30 to display the CO2 concentration and the comment that “the increase in CO2 concentration is abnormal. The air conditioner moves after 5 seconds” along with the total travel distance of the vehicle. It has become.

  In step S21 (corresponding to the ventilation request output means), the CPU 11 requests the communication unit 15 to transmit a ventilation request to the air conditioner ECU 3, thereby outputting (transmitting) the ventilation request to the air conditioner ECU 3, and performs the process of step S11. Return and repeat a series of processing. In addition, as an example of a ventilation request | requirement, it can be set as various different embodiments, such as starting ventilation of an air-conditioner and switching ventilation strongly.

  Next, an example of the operation (action) according to the present invention of the meter ECU 1 and the air conditioner ECU 2 in the above-described in-vehicle safety support system 100 will be described.

  The meter ECU 1 detects the rising speed of the CO2 concentration based on the concentration information acquired from the CO2 sensor 5. The meter ECU 1 compares the detected ascending speed with the ascending speed condition V in the determination condition information corresponding to the vehicle or the inside of the vehicle, and determines whether or not the ascent speed condition V is satisfied. And meter ECU1 will discriminate | determine that it is the raise of the CO2 density | concentration by exhalation, and the alarm information of the content shown in FIG. Is displayed on the LCD 30. Thereby, it can be expected that the interior of the vehicle is ventilated by the passenger opening the window, operating the air conditioner, etc., by referring to the alarm information.

  Further, the meter ECU 1 displays the advance notice information shown in FIG. 8 on the LCD 30 when the rising speed equal to or higher than the rising speed condition V continues for the duration time condition T or more. Thereby, it is possible to recognize in advance that the air conditioner starts to move after 5 seconds by referring to the notice information. And meter ECU1 transmits a demand for ventilation to air-conditioner ECU2, after outputting notice information. When the air conditioner ECU 2 receives the ventilation request from the meter ECU 1, the air conditioner ECU 2 drives the inside / outside air switching door to drive the blower so that the outside air is sucked. Thus, outside air is introduced into the vehicle and ventilation is performed.

  According to the in-vehicle safety support system 100 described above, an increase in the CO2 concentration due to exhalation is discriminated by paying attention to the rate of increase, so that the conventional determination threshold P for forcibly starting ventilation (see FIG. 9), it can be quickly determined whether or not the increase in CO2 concentration is due to the exhalation of the passenger. In addition, when the duration of the detected rising speed satisfies the duration condition, it is determined that the CO2 concentration has increased due to exhalation, and alarm information is output to the occupant. It can be expected to reduce the need for forced ventilation. Therefore, since the necessity for forcibly operating the air conditioner ECU 2 or the like can be reduced, the frequency at which the air conditioner ECU 2 or the like suddenly operates to surprise the occupant can be reduced, and it can contribute to energy saving. . In addition, when there is a danger to human life, the passenger can be ventilated after notifying the occupant of the start of ventilation based on the notice information, and therefore, the start of the ventilation operation can prevent the occupant from being surprised.

  In the above-described embodiment, the case where the meter ECU 1 (in-vehicle carbon dioxide concentration increase determination device) controls the air conditioner ECU 2 to forcibly ventilate the interior of the vehicle has been described. Instead of this, even in an embodiment in which the meter ECU 1 only outputs the alarm information to the occupant and does not control the air conditioner ECU 2, it is necessary to force the air conditioner or the like to operate forcibly in order to encourage the occupant to ventilate the vehicle interior. It is possible to reduce the frequency at which the air conditioner or the like suddenly operates and surprises the occupant, and contributes to energy saving.

  Furthermore, in this embodiment, although the case where the in-vehicle carbon dioxide concentration increase determination device was realized by the meter ECU 1 was described, the present invention is not limited to this, and a display function, an audio output function, etc. for passengers in the vehicle are provided. It can also be realized by various in-vehicle devices such as a car navigation system, a car audio system, and a taximeter.

  As described above, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 Carbon dioxide concentration rise discrimination device (meter ECU)
2 Ventilator (air conditioner ECU)
100 In-car safety support system P1 Concentration information acquisition means (CPU)
P2 Ascent speed detection means (CPU)
P3 discrimination means (CPU)
P4 Alarm information output means (CPU)
P5 Ventilation request output means (CPU)

Claims (3)

An in-vehicle carbon dioxide concentration increase determination device for determining the cause of an increase in the concentration of carbon dioxide in a vehicle,
The second increase rate of the carbon dioxide concentration is set to be faster than the first increase rate of the carbon dioxide concentration due to the exhalation in the vehicle, and at least one of blowing of the exhalation gas to the carbon dioxide sensor and drawing of the exhaust gas into the vehicle Discriminating condition information storage means for storing discriminating condition information having an ascending speed condition set later than that, and a duration condition that satisfies the ascent rate condition for determining that the concentration has increased due to exhalation,
Concentration information acquisition means for acquiring concentration information of carbon dioxide in the vehicle detected by the carbon dioxide sensor;
An ascending speed detecting means for detecting an ascending speed of the concentration satisfying the ascending speed condition based on the acquired density information;
A discriminating means for discriminating that the carbon dioxide concentration is increased by exhalation when the detected duration of the rising speed satisfies the duration condition;
Warning information output means for outputting warning information for warning to the passenger in the vehicle that the determination means has determined that the carbon dioxide concentration has increased due to exhalation;
An in-vehicle carbon dioxide concentration increase determination device characterized by comprising: The determination means is means for determining that the increase in the carbon dioxide concentration due to a factor other than the exhalation when the duration of the detected increase rate deviates from the duration condition,
When the determining means determines that the carbon dioxide concentration has increased due to a factor other than the exhalation, after the warning information for notifying the start of ventilation in the vehicle is output to the occupant, ventilation for requesting ventilation in the vehicle The in-vehicle carbon dioxide concentration increase determination device according to claim 1, further comprising a ventilation request output means for outputting the request to a predetermined request destination. In a vehicle safety support system having a ventilation device for ventilating the interior of the vehicle,
The in-vehicle carbon dioxide concentration increase determination device according to claim 2,
The ventilation request output means, the request destination is the ventilation device,
The in-vehicle safety support system characterized in that the ventilation device performs ventilation in the vehicle in response to a ventilation request from the ventilation request output means.

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