JP5619411B2 - Car interior carbon dioxide concentration alarm device - Google Patents

Description

  The present invention relates to a vehicle interior carbon dioxide concentration alarm device for detecting and alarming the concentration of carbon dioxide in a vehicle interior of a vehicle.

  In vehicles such as automobiles, it has been conventionally performed to detect and notify pollution information such as carbon dioxide concentration in the air in a passenger compartment with a sensor (see, for example, Patent Document 1).

  In recent years, a display device capable of displaying various information in a meter provided with a speedometer or the like is provided, and the contamination information is displayed as one of information indicating various vehicle states on the display device. It has also been done.

JP 2008-132814 A

  Using this type of display device, for example, when performing a caution display of carbon dioxide concentration among the above-mentioned contamination information, if the carbon dioxide concentration is lowered by performing ventilation after performing a display that prompts attention with a high carbon dioxide concentration, There is a problem that the driver cannot recognize even if the situation where the CO2 concentration is high and the attention needs to be resolved is switched to the information display indicating the state of other vehicles such as the fuel consumption meter and the carbon dioxide emission of the vehicle concerned. there were.

  In addition, although the caution display depends on the determination concentration setting, it is not necessarily performed in a highly urgent state.Therefore, if the warning display is continued when it is difficult to ventilate such as traveling in a tunnel, the driver will There was a problem that it sometimes felt uncomfortable.

  Therefore, the present invention provides a vehicle interior carbon dioxide concentration alarm device that can recognize that the caution state has been eliminated and that can prevent the driver from feeling uncomfortable in displaying the caution information. Is an issue.

The invention according to claim 1, which has been made in order to solve the above problem, is a concentration acquisition unit that acquires the carbon dioxide concentration in the air in the passenger compartment, and a caution that the carbon dioxide concentration detected by the concentration acquisition unit is predetermined. determining means for determining whether or not was concentration or more which requires, when said determination means has determined that the attention required concentration or by switching the information about the vehicle other than the table Shimesuru note information and the warning information In a vehicle interior carbon dioxide concentration alarm device having a display means for displaying, after displaying the caution information, if the determination means determines that the concentration is less than the concentration requiring attention, the caution state has been resolved. Information is displayed on the display means, and when the first predetermined time has elapsed since displaying the caution information or the information indicating that the caution state has been canceled, Display control means for changing the display of the display means from information indicating that the attention state has been resolved to information about the vehicle other than the attention information, and the determination means detected by the concentration acquisition means It is detected whether or not the carbon dioxide concentration is a concentration that requires a warning that is higher than the predetermined concentration that requires attention, and the display control unit determines that the determination unit has the concentration that requires the warning. If the warning information is displayed, warning information is displayed on the display means, and after the second time longer than the predetermined first time has elapsed, the warning information display displays information related to the vehicle other than the warning information. The vehicle interior carbon dioxide concentration alarm device is characterized by being changed.

  The invention according to claim 2 is provided with storage means for storing a history of displaying the caution information by the display control means in the invention according to claim 1, wherein the display control means After the display is changed to the information about the vehicle, the determination unit determines that the concentration is less than the concentration requiring attention, and the storage unit stores a history of displaying the attention information. Information indicating that the state has been resolved is displayed on the display means.

  According to a third aspect of the present invention, in the second aspect of the present invention, when the display control means causes the display means to display information indicating that the attention state has been resolved, the storage means stores the information. The history of displaying the attention information is erased.

As described above, according to the first aspect of the present invention, when the display control unit displays the caution information and the determination unit determines that the concentration is less than the concentration that requires attention, the fact that the caution state has been eliminated. Information indicating that the attention information or the attention state has been resolved when a predetermined first time has elapsed since the display means displays the information on the display means and displays the information indicating that the attention information or the attention state has been resolved. Since the display means display is changed to information about the vehicle other than the caution information, if the carbon dioxide concentration returns to normal, ventilation may be done such as closing the window to notify the driver, etc. It can be recognized that it is not necessary to carry out. In addition, the caution information and the information indicating that the caution state has been eliminated can be prevented from being continuously displayed, and the driver or the like does not feel uncomfortable. In addition, when the display control unit determines that the determination unit has a concentration that requires a warning, warning information is displayed on the display unit, and then a second time longer than a predetermined first time has elapsed. Since the display is later changed from the warning information display to information about the vehicle other than the warning information, the warning information may be divided into a warning state and a warning state that requires more urgency than the warning state, so that more detailed notifications can be made. it can.

  According to the invention described in claim 2, after the display control means changes the display to information relating to the vehicle other than the attention information, the determination means determines that the concentration is less than the concentration requiring attention, and the storage means When the history of displaying the caution information is stored, the display means displays information indicating that the caution state has been resolved. Even after switching, information indicating that the attention state has been resolved can be displayed and notified on the display means.

  According to the invention described in claim 3, when the information indicating that the attention state has been resolved is displayed on the display means, the history of displaying the attention information stored in the storage means is deleted. It is possible to manage the attention information and the information indicating that the attention state has been resolved in a one-to-one correspondence, and malfunction such as the information indicating that the attention state has been resolved is displayed many times. Can be prevented.

It is a front view which shows the external appearance of the combination meter provided with the vehicle interior carbon dioxide concentration alarm apparatus concerning the 1st Embodiment of this invention. It is a block diagram of the combination meter shown by FIG. It is the flowchart which showed the operation | movement at the time of displaying caution information based on the density | concentration of the carbon dioxide in a vehicle interior. It is a carbon dioxide emission amount display example. It is an example of a vehicle interior carbon dioxide caution display. It is a vehicle interior carbon dioxide fall display example. It is the flowchart which showed the operation | movement at the time of displaying warning information based on the density | concentration of the carbon dioxide in a vehicle interior of the vehicle interior carbon dioxide concentration alarm apparatus concerning the 2nd Embodiment of this invention. It is the flowchart which showed the operation | movement at the time of displaying warning information based on the density | concentration of the carbon dioxide in a vehicle interior of the vehicle interior carbon dioxide concentration alarm apparatus concerning the 3rd Embodiment of this invention.

[First Embodiment]
Next, a first embodiment of the present invention will be described with reference to FIGS. The vehicle interior carbon dioxide concentration alarm device according to the first embodiment of the present invention is provided in the combination meter shown in FIGS. 1 and 2.

  The combination meter 1 includes a plurality of instruments 2 that display measured values such as vehicle speed, engine speed, fuel remaining amount, temperature, etc., a liquid crystal display (LCD) 3 as display means, a plurality of warnings 4, and a trip switch 5 And. As is well known, the combination meter 1 is provided with a turn-back 6 between the plurality of meters 2 and the LCD 3, and is placed in front of the driver's seat of the vehicle in a state where they are covered with a front glass 7. ing.

  As is well known, each of the plurality of meters 2 has a dial with a scale and indicators such as numerals, letters or symbols provided on the surface, a pointer placed on the front face of the dial, and a measurement amount. And an internal unit that drives the pointer. The plurality of meters 2 of this embodiment includes a speedometer (SPEED) 2a and a tachometer (REV) 2b.

  As shown in FIG. 2, the combination meter 1 includes a CPU (Central Processing Unit) 11, an EEPROM (Electrically Erasable and Programmable Read Only Memory) 14, a motor driver 16, an LCD driver 17, a power supply circuit 18, and an interface. 19.

  The CPU 11 serving as a density acquisition unit, a determination unit, and a display control unit includes a ROM (Read Only Memory) 12, a RAM (Random Access Memory) 13, and a CAN (Controller Area Network) communication unit 15, and a combination meter. The control of the whole 1 is performed, and the control according to the program stored in the ROM 12 is performed. The CPU 11 operates with electric power supplied from the vehicle battery via the power supply circuit 18. 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) 19a, and operates according to the change of the IGN + from the ON state to the OFF state. finish.

  The ROM 12 stores a program and the like for controlling the display of the combination meter 1. The RAM 13 as a storage means stores various data and has an area necessary for processing operations of the CPU 11.

  The CAN communication unit 15 is communicably connected to a network conforming to the CAN standard built in the vehicle, and communicates with other electronic devices connected to the network using a CAN standard communication protocol. The CAN communication unit 15 transmits information obtained by calculation or the like inside the CPU 11 to the transmission destination via the I / F 19b, and outputs information received from another electronic device via the I / F 19b to the CPU 11 inside. .

  The EEPROM 14 is an electrically erasable / rewritable read-only memory, and is electrically connected to the CPU 11. The EEPROM 14 stores various data such as setting data of the CPU 11.

  Two meters 2 of a speedometer 2a and a tachometer 2b are electrically connected to the motor driver 16. 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.

  The LCD driver 17 is electrically connected to the LCD 3 and is driven by the control of the CPU 11. The LCD 3 is configured to be able to display information according to a request from the CPU 11. In the present embodiment, the case where the display means is realized by the LCD 3 will be described. However, the present invention is not limited to this. For example, a plasma display, an organic EL (Electro Luminescence) display, or the like can be used.

In addition, information of a fuel sensor installed in the vehicle is input to the CPU 11 via the I / F 19c. The information of the fuel sensor is used to calculate the carbon dioxide (CO ₂ ) emission amount of the vehicle, which will be described later. In addition, the information of the CO ₂ amount sensor installed in the vehicle compartment is input to the CPU 11 via the I / F 19d. Furthermore, the trip switch 5 is electrically connected.

  Of the combination meter configured as described above, the vehicle interior carbon dioxide concentration alarm device 20 according to the first embodiment of the present invention includes the CPU 11, the LCD 3, the LCD driver 17, and the interface 19.

Next, in the combination meter 1 having the above-described configuration, the operation when displaying the caution information based on the CO ₂ concentration in the passenger compartment will be described with reference to the flowchart of FIG.

First, in step S1, the CO ₂ emission data of the vehicle is fetched and the process proceeds to step S2. In this step, information is acquired from the fuel sensor connected to the CPU 11, and the CO ₂ emission amount is converted from the fuel consumption amount.

Next, in step S2, the CO ₂ emission amount taken in in step S1 is displayed on the LCD 3, and the process proceeds to step S3. In this step, as information about the vehicle other than the caution information, for example, the CO ₂ emission amount of the vehicle as shown in FIG. 4 is displayed, but of course not limited to this, a fuel consumption meter, a trip meter, etc. may be displayed.

Next, in step S3, the vehicle interior CO ₂ concentration data is taken, and the process proceeds to step S4. In this step, concentration information is acquired from the CO ₂ amount sensor connected to the CPU 11.

Next, in step S4, it is determined whether or not the vehicle interior CO ₂ concentration captured in step S3 is equal to or greater than a predetermined value. If it is equal to or greater than a predetermined value (in the case of Y), the process proceeds to step S5. If not (N), the process returns to step S1.

Next, in step S5, a cabin CO ₂ caution display is performed, and the process proceeds to step S6. In this step, the display on the LCD 3 is switched from the display in FIG. 4 to a display that prompts ventilation when the vehicle interior CO ₂ concentration is in a state requiring attention, for example, as shown in FIG. The condition requiring attention is, for example, a state where it is desirable to ventilate although it is not necessary to immediately ventilate, and therefore the constant value is a concentration that is desirable to be ventilated, for example, below the concentration causing drowsiness, etc. And it is sufficient. That is, when it is determined that the concentration is higher than the concentration requiring attention, the attention information is displayed on the LCD 3.

Next, in step S6, the vehicle interior CO ₂ concentration is taken in, and it is determined whether or not the vehicle interior CO ₂ concentration is less than a predetermined value. If the vehicle interior CO ₂ concentration is less than a predetermined value (in the case of Y), the process proceeds to step S7. If not (if N), go to step S8.

Next, in step S7, a vehicle interior CO ₂ reduction display is performed, and the process proceeds to step S8. In this step, for example, the display on the LCD 3 is switched to a display indicating that the vehicle interior CO ₂ concentration is lowered and the state requiring attention is eliminated as shown in FIG. That is, after displaying the attention information, if it is determined that the concentration is less than the concentration requiring attention, information indicating that the attention state has been resolved is displayed on the display means.

  Next, in step S8, it is determined whether or not a predetermined time has elapsed as the first time. If it has elapsed (in the case of Y), the process returns to step S1, and if not (in the case of N), the process returns to step S1. Return to S3. That is, when a predetermined first time has elapsed from the display of the caution information or the information indicating that the caution state has been resolved, the information indicating that the caution information or the caution state has been resolved is changed to information on the vehicle other than the caution information. The display of the display means is changed.

According to the present embodiment, the CPU 11 displays a caution display on the LCD 3 when the vehicle interior CO ₂ concentration is equal to or higher than a predetermined value, and then when the vehicle interior CO ₂ concentration becomes less than the predetermined value. When the vehicle interior CO ₂ concentration is reduced and the state that requires attention is displayed on the LCD 3, and when a predetermined period of time has elapsed since the CO ₂ caution display or CO ₂ reduction display is performed, Since the control is performed so as to change to the CO ₂ emission display, in order to notify the driver when the CO ₂ concentration returns to normal, there is no need to perform ventilation, for example, by closing the window. I can recognize good things. In addition, the caution information and the information indicating that the caution state has been eliminated can be prevented from being continuously displayed, and the driver does not feel uncomfortable. In addition, since the driver is notified that the CO ₂ concentration has decreased, it is possible to prevent the room temperature from changing significantly due to excessive ventilation, which can contribute to reducing the waste of using the air conditioner.

[Second Embodiment]
Next, a vehicle interior carbon dioxide concentration alarm device 20 according to a second embodiment of the present invention will be described with reference to FIG. Note that the same parts as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

This embodiment has the same configuration as that of the first embodiment, but the operation for displaying the caution information based on the concentration of CO _{2 in} the vehicle compartment is different. In the present embodiment, when the CO ₂ concentration decreases after switching to the CO ₂ emission amount display after a certain period of time, the vehicle interior CO ₂ reduction display is performed. The detailed operation will be described with reference to the flowchart of FIG.

First, steps S1 to S3 are the same as those in the first embodiment. In step S11 that has proceeded from step S3, it is determined whether or not there is a precaution flag as a history of displaying the caution information. If yes (if Y), the procedure proceeds to step S14, and if not (if N), the step is step. Proceed to S4. The precaution flag is a flag that is turned on when the vehicle interior CO ₂ caution display is performed before executing this step, and is turned off when the vehicle interior CO ₂ reduction display is performed. Has been. Then, by reading this flag and referring to it, it is possible to determine whether or not the vehicle interior CO ₂ reduction display has been performed before switching to the CO ₂ emission amount display.

Next, step S4 is the same as that of the first embodiment. In step S12, which proceeds when step S4 is Y, the vehicle interior CO ₂ caution display is performed and the front caution flag is turned on, and the process proceeds to step S6. In this step, for example, the vehicle interior CO ₂ concentration is in a state requiring attention as shown in FIG. 5, for example, and the display of the LCD 3 is switched to a display for prompting ventilation, and the precaution flag is turned on and stored in, for example, the RAM 13.

Next, step S6 is the same as that of the first embodiment. When step S6 is Y, step S13 proceeds to display in-vehicle cabin CO ₂ reduction and turn the precaution flag OFF to proceed to step S8. Step S8 is the same as in the first embodiment. In step S13, the display of the LCD 3 is switched to a display indicating that the vehicle interior CO ₂ concentration has decreased and the state requiring attention is eliminated as shown in FIG. 6, for example, and the precaution flag is turned off and stored in, for example, the RAM 13. That is, when information indicating that the attention state has been resolved is displayed on the LCD 3, the previous attention flag is erased.

On the other hand, when step S11 is Y, step S14 proceeds to determine whether or not the vehicle interior CO ₂ concentration captured in step S3 is less than a predetermined value. If YES), the process proceeds to step S15. If not (N), the process returns to step S1.

Next, in step S15, the vehicle interior CO ₂ reduction display is performed in the same manner as in step S13, and the precaution flag is set to the OFF state, and the process proceeds to step S8. That is, after the display is changed to information related to the vehicle other than the caution information, if it is determined that the concentration is less than the concentration requiring attention and the precaution flag is ON, information indicating that the caution state has been resolved is displayed. It is displayed on the LCD 3.

According to the present embodiment, after switching to the CO ₂ emission display, if the precaution flag is ON and the vehicle interior CO ₂ concentration is less than a predetermined value, the vehicle interior CO ₂ reduction display is performed. Therefore, it is possible to notify the driver or the like by displaying that the CO ₂ concentration has decreased even after switching to the CO ₂ emission display.

In addition, when the vehicle interior CO ₂ reduction display is performed, the front caution flag is turned OFF, so that the vehicle interior CO ₂ caution display and the vehicle interior CO ₂ reduction display are managed in one-to-one correspondence. Thus, it is possible to prevent malfunction such as displaying the vehicle interior CO ₂ reduction display many times.

[Third Embodiment]
Next, a vehicle interior carbon dioxide concentration alarm device 20 according to a third embodiment of the present invention will be described with reference to FIG. The same parts as those in the first and second embodiments described above are denoted by the same reference numerals and description thereof is omitted.

This embodiment has the same configuration as that of the first embodiment, but the operation for displaying the caution information based on the concentration of CO _{2 in} the vehicle compartment is different. In this embodiment, in addition to the second embodiment, if the CO ₂ concentration is higher than a certain value after switching to the CO ₂ emission display after a certain period of time, that is, if the state requiring attention continues, A warning is displayed. The detailed operation will be described with reference to the flowchart of FIG.

The flowchart of FIG. 8 differs in that step S21 is added to the flowchart of FIG. Step S21, which has proceeded when step S14 is N, determines whether or not a predetermined time has elapsed. If it has elapsed (in the case of Y), the process proceeds to step S12, and otherwise (in the case of N). Returns to step S8. In other words, in this step, if the CO ₂ concentration does not fall below a certain value after a lapse of a predetermined time after switching to the CO ₂ emission display, the caution display is performed again, assuming that the state requiring attention continues. Is operating. The predetermined time may be the same time as the fixed time in step S8 or may be a different time.

According to the present embodiment, after switching to the CO ₂ emission display, if the front caution flag is ON and the vehicle interior CO ₂ concentration is a predetermined value or more, the vehicle interior CO ₂ caution display is displayed again. Since this is done, attention can be urged again even after switching to the CO ₂ emission display.

In the above-described embodiment, the CO ₂ concentration is determined by one threshold value as a state requiring attention. However, a state requiring attention and a warning state having a higher concentration and higher urgency (for example, immediate ventilation) And two threshold values may be set. In this case, in the warning state, the content displayed as the warning display is not only different from the caution, but also the display time (fixed time) is, for example, 3 seconds for the caution and 10 seconds for the warning. To make the driver more aware. That is, the display contents of the indoor CO ₂ caution display in FIGS. 3, 7, and 8 may be changed according to the concentration. That is, after the second time longer than the first time has elapsed, the display is changed from the warning information display to information about the vehicle other than the caution information.

  In the above-described embodiment, the vehicle interior carbon dioxide concentration alarm device 20 is provided in the combination meter 1, but the present invention is not limited thereto, and the combination meter 1 may be provided in a device having a display device installed in another location in the vehicle interior.

  In addition, embodiment mentioned above only showed the typical form of this invention, and this invention is not limited to embodiment. That is, various modifications can be made without departing from the scope of the present invention.

1 Combination meter 3 LCD (display means)
11 CPU (density acquisition means, determination means, display control means)
13 RAM (storage means)
20 Car interior carbon dioxide concentration alarm device

Claims (3)

Concentration acquisition means for acquiring the carbon dioxide concentration in the air in the passenger compartment, determination means for determining whether or not the carbon dioxide concentration detected by the concentration acquisition means is equal to or higher than a predetermined concentration requiring attention, and the determination means in There cabin carbon dioxide concentration alarm device equipped with a display means for displaying by switching the information about the vehicle other than the table Shimesuru note information and the warning information when it is determined that the concentration or more which requires the attention,
If the determination means determines that the concentration is less than the concentration requiring attention after displaying the attention information, the display means displays information indicating that the attention state has been resolved, and the attention information or the attention state is displayed. When the predetermined first time has elapsed since displaying the information indicating that the information has been resolved, the display means changes the information from the information indicating that the attention information or the attention state has been resolved to information about the vehicle other than the attention information. Display control means for changing the display of
With
The determination means detects whether or not the carbon dioxide concentration detected by the concentration acquisition means is a concentration that requires a warning that is higher than a predetermined concentration that requires attention,
When the display control unit determines that the determination unit has the concentration that requires the warning, warning information is displayed on the display unit, and then a second time longer than the predetermined first time is displayed. After the elapse of time, the display is changed from the warning information display to information on the vehicle other than the caution information.
A vehicle interior carbon dioxide concentration alarm device. Storage means for storing a history of displaying the attention information by the display control means;
After the display control means has changed the display to information related to the vehicle other than the caution information, the determination means determines that the concentration is less than the concentration requiring attention, and the caution information is displayed on the storage means 2. The vehicle interior carbon dioxide concentration alarm device according to claim 1, wherein when the history is stored, information indicating that the attention state has been resolved is displayed on the display means.   The history of displaying the caution information stored in the storage means is deleted when the display control means causes the display means to display information indicating that the caution state has been resolved. 2. The vehicle interior carbon dioxide concentration alarm device according to 2.

Images