JP2010173454A - Ventilation device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a ventilation device for a vehicle allowing maintaining of the health of an occupant and saving of fuel consumption of the vehicle. <P>SOLUTION: An air supply regulating part 6 of this ventilation device determines supply amount of outside air per unit time to an occupant storing space 3 based on required air supply amount set in advance as supply amount of outside air per unit time to the occupant storing space 3 required per occupant and the number of occupants detected by an occupant number sensor 8, to suppress carbon dioxide concentration of the occupant storing space 3 to less than a prescribed value. By controlling the air supply regulating part 6, the determined supply amount of outside air is supplied to the occupant storing space 3. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a ventilation device that can be applied to a vehicle that accommodates a plurality of passengers, such as a vehicle or an aircraft.

  There is a known vehicle air conditioner that sets the amount of inside air circulation and the amount of outside air depending on the inside and outside of the vehicle, because the carbon dioxide concentration in the passenger accommodation space of the vehicle may increase the health of the passenger. Yes.

  Japanese Patent Application Laid-Open No. 2004-196063 describes a vehicle air conditioner intended to prevent adverse effects on the human body due to an increase in carbon dioxide concentration. The vehicle air conditioner includes an intake door that allows the inside air or the outside air to be selected according to the rotation position and can be taken into the air conditioning unit, and a blower that takes the inside air or the outside air into the air conditioning unit and blows the air into the vehicle. It has an evaporator and a heat core.

  In the air conditioning control of the vehicle air conditioner, in the inside air circulation mode, the carbon dioxide concentration becomes the reference value within the first set time based on the number of passengers detected by the pressure sensor and the carbon dioxide concentration detected by the concentration detection sensor. A prediction reference value that is predicted to be reached is calculated. The first set time is a value that varies depending on the number of passengers, and the time required from when the danger avoidance operation starts until the carbon dioxide concentration actually starts to decrease is used. The standard value of carbon dioxide concentration has some adverse effects on the human body, such as 0.1%, which affects the functions of respiratory organs, circulatory organs, cerebrum, etc., tinnitus, headache, increased blood pressure, etc. Use 4% to show signs of It is determined whether or not the carbon dioxide concentration detected by the concentration detection sensor has reached the predicted reference value, and if it has reached, the inside air circulation mode is switched to the outside air introduction mode as a danger avoidance operation.

  Further, in the outside air circulation mode, the carbon dioxide concentration in the vehicle may increase due to the influence of exhaust gas or the like, and the current detected value of carbon dioxide concentration is predicted to reach the reference value within the second set time. When the predicted reference value is reached, the outside air introduction mode is switched to the inside air introduction mode.

  Japanese Patent Application Laid-Open No. 2000-177362 describes a vehicle air conditioner including an inside / outside air switching door control device for the purpose of suppressing an increase in the carbon dioxide concentration in the passenger compartment according to the number of passengers. Yes. In the vehicle air conditioner, the uppermost end of the air conditioning duct is branched into an outside air introduction port and an inside air introduction port, and an inside / outside air switching door for selecting air to be introduced into the air conditioning duct is provided at this branching portion. Is provided. A blower motor, an evaporator, and a heat core are arranged on the downstream side of the air conditioning duct, and the rear end side of the air conditioning duct is branched into a plurality of openings in the passenger compartment. In the inside / outside air switching door control device, the number of occupants of 1 to 4 persons is determined based on the output signal of the occupant detection sensor such as a pyroelectric infrared sensor or an ultrasonic sensor, and the outside of the passenger compartment is determined based on the output signal of the gas sensor. Judgment is made by classifying into four states of state 1 to state 4 in order from the lowest air pollution, and the door position setting process of the inside / outside air switching door is performed based on the number of passengers and the state. For example, when the degree of air pollution outside the passenger compartment is in state 1, the door position of the inside / outside air switching door is set to a position where only outside air is introduced regardless of the number of passengers. In addition, when the degree of air pollution outside the passenger compartment is in state 4, the door position of the inside / outside air switching door is set to a position where the outside air introduction amount is 10% when the number of passengers is one, and the number of passengers increases. Accordingly, the outside air introduction amount is set to a position increased by 10%. The door position of the inside / outside air switching door in the state 4 and in the case of four passengers is the same even if the outside of the passenger compartment is dirty and the number of passengers in the passenger compartment is maximum. The introduction of outside air at the door position is determined from the viewpoint of not causing any inconvenience to the health of the passengers.

JP 2004-196063 A JP 2000-177362 A

  In the configuration disclosed in Japanese Patent Application Laid-Open No. 2004-196063, when it is determined that the carbon dioxide concentration in the vehicle is not likely to increase due to the influence of exhaust gas or the like in the outside air introduction mode, the outside air introduction mode is maintained. Moreover, in the structure of the said Unexamined-Japanese-Patent No. 2000-177362, when it is judged that the dirt condition of the air outside a vehicle interior is the state 1, only external air is introduce | transduced.

  However, when the outside air temperature and the optimum temperature of the passenger compartment are greatly different, for example, in summer and winter, if the outside air is positively introduced, the load on the air conditioner increases and the fuel consumption deteriorates.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle ventilation device that can maintain the health of an occupant and can save fuel consumption of the vehicle.

  In order to achieve the above object, a vehicle ventilation device of the present invention includes a communication path, an air supply adjusting means, an occupant number detecting means, and an air supply control means.

  The communication path communicates the inside and outside of the passenger accommodation space for accommodating the passenger, and can supply outside air to the passenger accommodation space. The air supply adjusting means is provided in the communication path, and can change the amount of outside air supplied to the passenger accommodation space per unit time. The occupant number detection means detects the number of occupants accommodated in the occupant accommodation space. The air supply control means needs to be set in advance as a supply amount of outside air per unit time to the passenger accommodation space that is required for each passenger in order to keep the concentration of carbon dioxide in the passenger accommodation space below a predetermined value. Based on the air supply amount and the number of occupants detected by the occupant number detection means, the supply amount of outside air per unit time to the occupant accommodating space is determined, and the supply adjustment means is controlled to determine the determined supply amount. The outside air is supplied to the passenger accommodation space.

  As the predetermined value of the concentration of carbon dioxide, for example, 1000 ppm specified in the Enforcement Order of the Law (Building Management Law) concerning the sanitary environment in buildings is used.

  In the above configuration, the required air supply set in advance as the supply amount of outside air per unit time required for each passenger to suppress the concentration of carbon dioxide in the passenger accommodation space below a predetermined value. Based on the amount and the number of passengers, the supply amount of the outside air per unit time to the passenger accommodation space is determined. For example, a value obtained by multiplying the required air supply amount and the number of passengers is determined as the supply amount of outside air per unit time to the passenger accommodation space. As a result, the supply of outside air per unit time to the occupant accommodation space required to keep the concentration of carbon dioxide in the occupant accommodation space below a predetermined value for all the occupants detected by the occupant number detection means The air supply adjusting means can supply the amount to the passenger accommodation space. Therefore, since the concentration of carbon dioxide in the occupant accommodating space is always kept below a predetermined value, the occupant's health can be maintained.

  Further, since the concentration of carbon dioxide in the passenger accommodation space can be kept below a predetermined value without providing a device for detecting the concentration of carbon dioxide in the passenger accommodation space, costs can be reduced.

  Further, the supply amount of outside air to the passenger accommodation space is limited to the supply amount determined by the supply air control means. Therefore, when there is a difference between the temperature of the outside air and the set temperature of the inside air (for example, summer when the temperature of the inside air is set lower than the temperature of the outside air or winter when the temperature of the inside air is set higher than the temperature of the outside air). Further, since the consumption of energy for exchanging heat with the inside air can be suppressed, the fuel consumption of the vehicle can be reduced.

  Further, the air supply adjustment means may have a fan for forcibly supplying outside air to the passenger accommodation space, and the air supply control means changes the number of rotations of the fan to change the unit time to the passenger accommodation space. The supply amount of the outside air per hit may be changed.

  The air supply adjusting means may have a damper that can move between a fully open position that fully opens the communication path and a fully closed position that fully closes the communication path, and the air supply control means determines the position of the damper. Change the amount of outdoor air supplied to the passenger accommodation space by changing the opening of the communication passage or changing the time ratio per unit time to set the damper at the fully open position to the fully open position. May be.

  Further, the air supply adjusting means may include both the fan and the damper, and the air supply control means is configured to control the outside air per unit time to the occupant accommodating space by fan rotation control and damper movement control. The supply amount may be changed.

  Further, the vehicle ventilation device may include speed detection means. The speed detecting means detects the moving speed of the vehicle provided with the vehicle ventilation device. The air supply control means executes fan rotation control or damper movement control based on the number of occupants detected by the occupant number detection means and the movement speed detected by the speed detection means.

  In general, the communication path is a flow of outside air per unit time according to the increase or decrease of the moving speed of the vehicle even when the fan does not forcibly supply the outside air to the passenger accommodation space and the damper opens the communication path. The amount increases or decreases.

  For this reason, if the rotation control of the fan or the movement control of the damper is executed assuming a predetermined fixed value as the moving speed of the vehicle, the concentration of carbon dioxide is set to the predetermined value when the actual moving speed is lower than the predetermined fixed value. There is a possibility that the supply amount of the outside air necessary to keep the air pressure below the limit cannot be supplied to the occupant accommodating space, and the health of the occupant cannot be maintained. On the other hand, when the actual moving speed is higher than a predetermined fixed value, the outside air is supplied to the occupant accommodating space with an amount of air that is greater than the supply amount required to keep the concentration of carbon dioxide below the predetermined value, and the temperature of the occupant accommodating space is set. For example, when the outside air temperature and the optimum temperature of the passenger compartment are greatly different, such as in summer and winter, there is a possibility that the load on the air conditioner is increased and the fuel consumption of the vehicle is deteriorated.

  In contrast, in the above configuration, fan rotation control or damper movement control is executed based on the number of passengers and the movement speed. For example, the relationship between the number of occupants, the moving speed of the vehicle, and the inflow amount of outside air per unit time to the communication path is set in advance, and based on the set relationship, the detected number of occupants and the detected moving speed, Fan rotation control or damper movement control is executed. As a result, the excess and deficiency of the supply amount of the outside air to the passenger accommodation space due to the moving speed of the vehicle is reduced, so the supply necessary to keep the concentration of carbon dioxide to the passenger accommodation space below a predetermined value. A large amount of outside air can be supplied to the occupant accommodating space more reliably, so that the health of the occupant can be maintained and the fuel consumption of the vehicle can be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, a passenger | crew's health can be maintained and the fuel-saving of a vehicle can be achieved.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2.

  FIG. 1 is a schematic diagram of a vehicle (vehicle) 1 including a vehicle ventilation device according to the present embodiment, and FIG. 2 is a flowchart of an outside air supply process executed by a controller of the vehicle ventilation device of FIG.

  As shown in FIG. 1, the vehicle ventilation device 2 of the vehicle 1 is an HVAC (Heating, Ventilating and Air-Conditining) system, and includes a communication path 5, an air supply adjustment unit 6, an outside air state sensor 7, and a passenger number sensor 8. And a speed sensor 9, an air conditioner (not shown), and a controller 10.

  The communication path 5 has an opening 51, a blower opening 52, and a guide pipe 53, and communicates with the inside and outside of the passenger accommodation space 3 that is partitioned inside the vehicle 1 and accommodates a plurality of passengers. External air (outside air) can be supplied to the passenger accommodation space 3. The opening 51 opens toward the front in the traveling direction outside the vehicle 1 and receives outside air. The air outlet 52 is provided inside the vehicle 1 and opens in the passenger accommodation space 3. The guide tube portion 53 communicates the opening 51 and the air blowing port portion 52 and guides the received outside air to the passenger accommodation space 3.

  The air supply adjustment unit 6 is provided in the communication path 5 and constitutes an air supply adjustment unit that can change the amount of external air supplied to the passenger accommodation space 3 per unit time. The air supply adjustment unit 6 of the present embodiment includes a fan 61 and a damper 63.

  The fan 61 is driven to rotate by the motor 62 and forcibly supplies the air in the communication path 5 to the passenger accommodation space 3.

  The damper 63 is moved by the drive of the actuator 64, and fully opens the communication path 5 to block the air (inside air) supplied to the passenger accommodation space 3 (shown by a solid line in FIG. 1). It can be moved between a fully closed position (shown by a dotted line in FIG. 1) where the outside air is shut off. When the damper 63 is set to the fully closed position, the vehicle 1 enters an inside air circulation state in which inside air circulates in the passenger accommodation space 3. Further, when the damper 63 is set to a position other than the fully closed position, the vehicle 1 enters an outside air introduction state in which outside air is introduced into the passenger accommodation space 3. The position sensor 65 detects the position of the damper 63. The position sensor 65 outputs a damper state signal including information on the position of the detected damper 63 to the controller 10.

  The outside air state sensor 7 uses a semiconductor gas sensor and is disposed on the outer surface of the vehicle 1 to detect NOx (nitrogen oxide) concentration, CO (carbon monoxide) concentration, etc. in the outside air, and to obtain information on NOx concentration and CO concentration. Is output to the controller 10.

  The occupant number sensor 8 is a sensor that constitutes occupant number detection means and detects pressure. The occupant number sensor 8 is provided in a seat on which each occupant accommodated in the occupant accommodating space 3 is seated. Is turned on or off to detect the number of passengers, and an occupant detection signal including information on the detected number of passengers is output to the controller 10.

  The occupant number sensor 8 is not limited to a sensor that detects pressure. For example, the controller 10 can calculate the area and number of regions in which the temperature changes by detecting the entire occupant housing space 3 from above by using an infrared sensor that detects temperature. An occupant detection signal including such information may be output to the controller 10. The occupant number sensor 8 may detect the number of occupants that are disposed at the entrance of the vehicle 1 and pass through the entrance, and output an occupant detection signal including information on the detected number of occupants to the controller 10.

  The speed sensor 9 constitutes a speed detection means, detects the moving speed of the vehicle 1, and outputs a speed detection signal including information on the detected moving speed to the controller 10.

  The air conditioner has an evaporator and a heat core, is provided in the communication path 5, and exchanges heat with air supplied to the passenger accommodation space 3. In addition, the air conditioner may be provided in the passenger accommodation space 3 to exchange heat with the inside air.

  The controller 10 includes a CPU (Central Processing Unit) 11, a ROM (Read Only Memory) 12, and a RAM (Random Access Memory) 13, and constitutes an air supply control unit that executes an outside air supply process. In the outside air supply process, signals output from various sensors including the outside air state sensor 7, the occupant number sensor 8, the speed sensor 9, and the position sensor 65 are input, and the inside air circulation state or the outside air introduction state is set based on the input signals. In addition, in order to keep the concentration of carbon dioxide in the occupant accommodation space 3 below a predetermined value, determination of the required outside air supply amount that is the supply amount of outside air per unit time to the occupant accommodation space 3 that is required for all occupants And the control of the air supply adjusting means for supplying the determined necessary amount of outside air to the passenger accommodation space 3.

  The ROM 12 stores a required air supply amount. The required air supply amount is set in advance as the supply amount of outside air per unit time required for each passenger to suppress the concentration of carbon dioxide in the passenger accommodation space 3 below a predetermined value. The

In this embodiment, 1000 ppm prescribed | regulated by the law (building management law) enforcement order regarding the ensuring of the sanitary environment in a building is used for the predetermined value of the concentration of carbon dioxide. Then, 13 m ³ / h is stored as the required supply amount. The value of the required supply amount of 13 m ³ / h was previously confirmed in the vehicle 1 as a value satisfying the carbon dioxide concentration of 1000 ppm by experiments. In addition to this value, in the vehicle 1 in which the vehicle ventilation device 2 is provided, the passenger accommodation space 3 required for each passenger to suppress the concentration of carbon dioxide in the passenger accommodation space 3 below a predetermined value. You may memorize | store the thing which measured or calculated and set the supply amount of the external air per unit time in advance.

  Further, not only the required air supply amount per passenger, but also the required air supply amount may be preset and stored according to the number of possible passengers.

  Further, an air supply amount necessary for each stage may be set and stored for a plurality of people. Specifically, the supply amount required for each of a plurality of people, such as the supply amount required for three people when 1 to 3 people, the supply amount required for 6 people when 4 to 6 people, etc. It may be set and stored in advance.

  Further, in the ROM 12, the outside air is not forcibly supplied to the passenger accommodation space 3 by the fan 61, and the moving speed of the vehicle 1 and the unit time to the communication path 5 in a state where the damper 63 is set to the fully open position. The relationship with the amount of outside air flowing in is preset and stored.

  In the present embodiment, the relationship between the moving speed of the vehicle 1 and the inflow amount of outside air per unit time to the communication path 5 that increases as the moving speed of the vehicle 1 increases is obtained in advance by experiments, calculations, and the like. A graph indicating the obtained relationship is stored.

  The CPU 11 determines whether or not the NOx concentration or the CO concentration exceeds a predetermined concentration set in advance based on the outside air state signal output from the outside air state sensor 7, and determines that either exceeds the predetermined concentration. In this case, it is set to an inside air circulation state in which inside air is circulated, and when it is determined that both are equal to or lower than a predetermined concentration, an outside air introduction state in which outside air is introduced is set.

  Further, the CPU 11 calculates the number of passengers accommodated in the passenger accommodation space 3 based on the passenger detection signal output by the passenger number sensor 8. Specifically, the number of ON detected by the occupant number sensor 8 in each seat is added up.

  In addition, when using what detected the passenger | crew number of the passenger | crew of the vehicle 1 using an infrared sensor etc. as the passenger | crew number sensor 8, CPU11 may calculate a passenger | crew number based on the detected passenger | crew number. For example, the present invention may be applied to a bus in which there are many people who can get on, there are few entrances, and one passenger goes on and off from the entrance. Specifically, in a bus having one entrance and one exit, an occupant number sensor 8 for detecting the number of passengers passed is provided at the entrance and exit, and the number of passengers detected by the CPU 11 at the entrance and exit. The number of passengers is calculated from the difference in the number of people detected by mouth. Thereby, a large number of passengers can be detected effectively by a small number of passengers sensor 8.

  The number of passengers to be calculated is not limited to an integer, and may be a number including a decimal point. Specifically, the occupant detection sensor 8 may detect the weight of the occupant accommodated in the occupant accommodation space 3, and the CPU 11 presets the weight detected by the occupant detection sensor 8 as the average weight of one adult. The number of occupants may be calculated by dividing the given weight by a number up to two decimal places.

  Further, the CPU 11 sets the unit time for the passenger accommodation space 3 required for all the passengers based on the required air supply amount that is preset and stored in the ROM 12 and the number of passengers detected by the passenger number sensor 8. The required outside air supply amount that is the supply amount of the outside air per unit is determined. In the present embodiment, the necessary outside air supply amount is determined by multiplying the required air supply amount required for each adult stored in the ROM 12 and the calculated number of passengers.

  In the case where the necessary air supply amount is preset and stored in the ROM 12 according to the number of occupants who may get on the vehicle 1, the CPU 11 reads out the air supply amount corresponding to the number of passengers from the ROM 12. Determine the required outside air supply.

  Further, when the air supply amount necessary for each stage is set for a plurality of persons and stored in the ROM 12, the CPU 11 determines the necessary external air supply amount according to the stage including the detected number of passengers. For buses and trains that accommodate a large number of people, it is difficult to accurately detect the number of passengers, so it is effective to set the supply amount in stages.

  In addition, the CPU 11 controls the air supply adjusting unit 6 to supply a necessary amount of outside air to the passenger accommodation space 3.

  Specifically, the rotational speed of the motor 62 is determined, and a voltage corresponding to the determined rotational speed is supplied to the motor 62 to rotate the fan 61, thereby supplying outside air per unit time to the passenger accommodation space 3. Change the amount. Further, the position of the damper 63 is determined, and the voltage supplied to the actuator 64 is set based on the determined position of the damper 63 and the damper state signal indicating the current position of the damper 63 input from the position sensor 65 to set the damper. By moving 63, the amount of outside air supplied to the passenger accommodation space 3 per unit time is changed. In the present embodiment, the amount of outside air supplied to the passenger accommodation space 3 per unit time is changed by changing the position of the damper 63 steplessly and changing the opening of the communication passage. It should be noted that the position of the damper 63 may be set to three or more stages, not stepless. Further, in order to change the supply amount of the outside air per unit time to the occupant accommodating space 3 by the damper 63, the position of the damper 63 is set in two stages, a fully open position and a fully closed position, and the damper 63 in the fully open position is set. The time ratio per unit time for setting to the fully open position may be changed.

  Here, since the communication path 5 takes in outside air from the opening 51 that opens toward the outside of the vehicle 1, the fan 61 does not forcibly supply outside air to the passenger accommodation space 3 and the damper 63 passes through the communication path 5. Even in the open state, the inflow amount of outside air per unit time to the communication path 5 increases and decreases according to the increase and decrease of the moving speed of the vehicle 1.

  For this reason, in this embodiment, the inflow amount of outside air per unit time to the communication path 5 with respect to a preset moving speed of the vehicle 1, the number of passengers detected by the passenger number sensor 8, and the movement detected by the speed sensor 9 Based on the speed, the rotation control of the fan 61 or the movement control of the damper 63 that supplies the necessary outside air supply amount to the passenger accommodation space 3 is executed.

  First, the CPU 11 determines that the outside air is not forcibly supplied to the occupant accommodating space 3 by the fan 61 and the moving speed of the vehicle 1 and the unit time to the communication path 5 in a state where the damper 63 is set to the fully open position. Based on the read relationship from the ROM 12 and the speed detection signal input from the speed sensor 9, the outside air is not forcibly supplied to the passenger accommodation space 3 by the fan 61 and In the state where the damper 63 is set to the fully open position, a maximum outside air inflow amount that is a maximum inflow amount of the outside air per unit time into the passenger accommodation space 3 at the current moving speed is obtained.

  Next, the CPU 11 determines the necessary outside air based on the necessary outside air supply amount determined based on the number of occupants detected by the occupant number sensor 8 and the maximum outside air inflow amount determined based on the moving speed detected by the speed sensor 9. The rotation control of the fan 61 or the movement control of the damper 63 for supplying the supply amount to the passenger accommodation space 3 is executed. Specifically, if the required outside air supply amount and the maximum outside air inflow amount are the same, the damper 63 is set to the fully open position while the fan 61 is stopped, so that the required amount of outside air is supplied to the passenger accommodation space 3. Supply. Further, when the required outside air supply amount is smaller than the maximum outside air inflow amount, the position of the damper 63 is changed according to the ratio of the required outside air supply amount and the maximum outside air inflow amount (required outside air supply amount / maximum outside air inflow amount). Thus, the opening amount of the communication passage 5 is narrowed to suppress the excess inflow amount, thereby supplying the necessary outside air supply amount of outside air to the passenger accommodation space 3. Further, when the necessary outside air supply amount is larger than the maximum outside air inflow amount, the rotation amount of the fan 61 is set and the supply amount for the shortage is compensated to supply the necessary outside air supply amount to the passenger accommodation space 3. Let

  In the present embodiment, the ROM 12 stores the required air supply amount, the relationship between the moving speed of the vehicle 1 and the amount of outside air flowing into the communication path 5 per unit time, but is not limited thereto. For example, the number of passengers, the moving speed of the vehicle, and the unit time to the passenger accommodation space 3 in a state where the outside air is not forcibly supplied by the fan and the damper 63 is set to the fully open position. The relationship between the amount of the outside air inflow and the rotation control of the fan 61 and the movement control of the damper 63 required in these combinations may be set in advance and stored in the ROM 12. Based on the stored relationship, the number of passengers detected by the passenger number sensor 8, and the moving speed detected by the speed sensor 9, the CPU 11 controls the rotation of the fan 61 or the movement of the damper 63 required from the ROM 12. Read control and execute control.

Next, the outside air supply process executed by the controller 10 will be described with reference to the flowchart of FIG. This process starts when the engine is started and is executed every predetermined time (for example, every minute). In this process, control for supplying outside air of 0.217 m ³ / min (13 m ³ / h) per passenger to the passenger accommodation space 3 is executed.

  When this process is started, first, in step S1, an outside air state signal output from the outside air state sensor 7, an occupant detection signal output from the occupant number sensor 8, a speed detection signal output from the speed sensor 9, and a position sensor 65. Obtains signals output by various sensors including the damper state signal output by, and proceeds to step S2.

  In step S2, it is determined based on the outside air state signal whether any one of the contaminants exceeds a predetermined value. If any one of the contaminants exceeds the predetermined value, the outside air contamination state is determined. If any concentration of the pollutant is below a predetermined value, it is determined that the outside air is not polluted.

  If it is determined in step S2 that the outside air is in a contaminated state, the damper 63 is moved to the fully closed position in step S3, set to the inside air circulation state, and the present process is terminated.

  On the other hand, when it is determined in step S2 that the outside air is not contaminated, the process proceeds to step S4 in order to enter the outside air introduction state.

  In step S4, the number of passengers is calculated based on the passenger detection signal, and the process proceeds to step S5.

In step S5, the required outside air supply amount is determined by multiplying the required supply amount 13m ³ / h set in the ROM 12 by the number of passengers calculated in step S5, and the process proceeds to step S6.

  In step S6, the maximum outside air inflow amount is calculated based on the relationship between the moving speed of the vehicle set in the ROM 12 and the inflow amount of outside air per unit time into the communication path and the moving speed indicated by the speed detection signal. The process proceeds to step S7.

  In step S7, it is determined whether or not the necessary outside air supply amount exceeds the maximum outside air inflow amount. If the necessary outside air supply amount exceeds the maximum outside air inflow amount, the process proceeds to step S8, and the necessary outside air supply amount is determined. When it is below the maximum outside air inflow amount, the process proceeds to step S9.

  In step S8, the difference of the maximum outside air inflow amount with respect to the required outside air supply amount is calculated, the number of rotations of the fan 61 necessary for supplying the calculated supply amount of outside air to the passenger accommodation space 3 is calculated, and the process proceeds to step S10. To do.

  In step S10, the damper 63 is controlled to move to the fully open position, and the process proceeds to step S11.

  In step S11, a voltage for driving the motor is calculated based on the number of revolutions calculated in step S8, the calculated voltage is supplied to the motor to control the rotation of the fan 61, and the necessary amount of outside air is supplied to the passenger accommodation space. 3 to finish the process.

  In step S9, it is determined whether the required outside air supply amount and the maximum outside air inflow amount are the same. If the necessary outside air supply amount and the maximum outside air inflow amount are the same, the process proceeds to step S12, and the required outside air supply amount is the maximum. When it is less than the outside air inflow amount, the process proceeds to step S13.

  In step S12, the damper 63 is controlled to move to the fully open position, the required amount of outside air is supplied to the passenger accommodation space 3, and the process is terminated.

  In step S13, the ratio between the required outside air supply amount and the maximum outside air inflow amount is calculated, the position of the damper 63 suitable for flowing the calculated ratio of the outside air into the passenger accommodation space 3 is calculated, and the process proceeds to step S14. .

  In step S14, a voltage for driving the actuator 64 is calculated based on the position of the damper 63 calculated in step S13 and the damper state signal, and the calculated voltage is supplied to the actuator 64 to control the movement of the damper 63. Then, the required amount of outside air is supplied to the occupant accommodating space 3 and the process is terminated.

  In the present embodiment, when the required outside air supply amount is less than the maximum outside air inflow amount, the damper 63 is moved to a position narrower than the fully opened position while the fan 61 is stopped, thereby reducing the outside air supply amount. However, the present invention is not limited to this, and the rotation control of the fan 61 may be executed together with the movement control of the damper 63 even when the required outside air supply amount is less than the maximum outside air inflow amount. In such control, even if the position of the damper 63 is set not in a stepless manner but in a plurality of steps (for example, five steps), a stepless supply amount of outside air is supplied to the passenger accommodation space 3 by the rotation control of the fan 61. Therefore, the necessary amount of outside air can be supplied to the passenger accommodation space 3.

  Further, in the present embodiment, in the outside air supply process, the rotation control of the fan 61 and the movement control between the fully open position and the fully closed position of the damper 63 are executed to supply the necessary outside air supply amount of outside air to the passenger accommodation space 3. However, the present invention is not limited to this, and in the outside air supply process, the rotation control of the fan 61 and the movement control of the damper 63 to the fully open position or the fully closed position are executed to supply the required amount of outside air to the passenger accommodation space 3. Alternatively, only the movement control of the damper 63 may be executed to supply the required amount of outside air to the passenger accommodation space 3.

  In this embodiment, the speed detection signal output by the speed sensor 9 is acquired and used every time the outside air supply process is executed. However, the present invention is not limited to this, and the average value of the acquired speed is used for the outside air supply process. Also good. Specifically, when the outside air supply process is executed every minute, the speed detection signal may be acquired every 500 milliseconds, and the average value of the acquired speeds for one minute may be used as the moving speed of the vehicle. Alternatively, when the outside air supply process is executed every 500 milliseconds, the speed detection signal may be acquired every 500 milliseconds, and the acquired average value for 20 times may be used as the moving speed of the vehicle. By using the average value of the speed, it is possible to supply in a stable state without frequently changing the control according to the change of the moving speed in a short time such as temporary stop or sudden acceleration. In addition, since it is difficult to determine that the speed is zero in the case of a temporary stop, the driving amount of the fan 61 can be reduced.

  As described above, in the present embodiment, the supply of outside air per unit time to the passenger accommodation space 3 that is required for each passenger in order to keep the concentration of carbon dioxide in the passenger accommodation space 3 below a predetermined value. The supply amount of outside air per unit time to the passenger accommodation space 3 is determined based on the required air supply amount and the number of passengers set in advance. Specifically, a value obtained by multiplying the required air supply amount and the number of passengers is determined as a required external air supply amount that is an external air supply amount per unit time to the passenger accommodation space 3. As a result, the outside air per unit time to the occupant accommodating space 3 required to suppress the concentration of carbon dioxide in the occupant accommodating space 3 to be less than a predetermined value for all the occupants detected by the occupant number sensor 8. Can be supplied to the passenger accommodation space 3 by the air supply adjusting unit 6. Therefore, since the concentration of carbon dioxide in the occupant accommodating space 3 is always kept below a predetermined value, the occupant's health can be maintained.

  In addition, since it is possible to suppress the concentration of carbon dioxide in the passenger accommodation space 3 below a predetermined value without providing a device for detecting the concentration of carbon dioxide in the passenger accommodation space 3, it is possible to reduce costs.

  Further, the supply amount of outside air to the passenger accommodation space 3 is limited to the necessary outside air supply amount determined by the controller 10. Therefore, when there is a difference between the temperature of the outside air and the set temperature of the inside air (for example, summer when the temperature of the inside air is set lower than the temperature of the outside air or winter when the temperature of the inside air is set higher than the temperature of the outside air). In addition, since it is possible to suppress the energy consumption of the air conditioner that exchanges heat with the inside air, the fuel consumption of the vehicle 1 can be reduced.

  In addition, a relationship between the moving speed of the vehicle 1 and the amount of outside air flowing into the communication passage 5 per unit time is set in advance, and the fan 61 is controlled based on the set relationship, the detected number of passengers, and the detected moving speed. The rotation control or the movement control of the damper 63 is executed. Thereby, since the excess and deficiency of the supply amount of the outside air to the occupant accommodation space 3 due to the moving speed of the vehicle 1 is reduced, the concentration of carbon dioxide to the occupant accommodation space 3 is more reliably suppressed to less than a predetermined value. Therefore, the supply amount of outside air required for this purpose can be supplied to the occupant accommodating space 3, so that the health of the occupant can be maintained and the fuel consumption of the vehicle 1 can be reduced.

  As mentioned above, although the embodiment to which the invention made by the present inventor is applied has been described, the present invention is not limited by the discussion and the drawings that form part of the disclosure of the present invention according to this embodiment. That is, it should be added that other embodiments, examples, operation techniques, and the like made by those skilled in the art based on this embodiment are all included in the scope of the present invention.

It is a mimetic diagram of vehicles provided with a vehicle ventilator concerning this embodiment. It is a flowchart of the external air supply process which the controller of the vehicle ventilation apparatus of FIG. 1 performs.

1: Vehicle 2: Ventilator for vehicle 3: Occupant accommodation space 5: Communication passage 6: Air supply adjustment unit (air supply adjustment means)
7: Outside air condition sensor 8: Occupant number sensor (occupant number detection means)
9: Speed sensor (speed detection means)
10: Controller (supply control means)

Claims (4)

A communication path that allows communication between the inside and outside of the passenger accommodation space for accommodating the passenger, and that can supply outside air to the passenger accommodation space;
An air supply adjusting means provided in the communication path and capable of changing a supply amount of outside air per unit time to the passenger accommodation space;
An occupant number detecting means for detecting the number of occupants accommodated in the occupant accommodating space;
A required air supply amount set in advance as a supply amount of outside air per unit time required for each passenger to suppress the concentration of carbon dioxide in the passenger storage space below a predetermined value; And determining the supply amount of outside air per unit time to the passenger accommodation space based on the number of passengers detected by the passenger number detection means, and controlling the air supply adjustment means to determine the supply amount of the determined supply amount. An air supply control means for supplying outside air to the passenger accommodation space. The vehicle ventilation device according to claim 1,
The air supply adjustment means has a fan for forcibly supplying outside air to the passenger accommodation space,
The vehicle ventilation device according to claim 1, wherein the air supply control means changes the supply amount of outside air per unit time to the passenger accommodation space by changing the rotational speed of the fan. The vehicle ventilation device according to claim 1,
The air supply adjusting means has a damper that can move between a fully open position that fully opens the communication path and a fully closed position that fully closes the communication path,
The air supply control means changes the position of the damper to change the opening of the communication path, or by changing the time ratio per unit time for setting the damper at the fully opened position to the fully opened position, A vehicle ventilator characterized by changing a supply amount of outside air per unit time to the passenger accommodation space. A vehicle ventilator according to claim 2 or claim 3,
A speed detecting means for detecting a moving speed of the vehicle provided with the vehicle ventilation device;
The air supply control means performs rotation control of the fan or movement control of the damper based on the number of occupants detected by the occupant number detection means and the movement speed detected by the speed detection means. Vehicle ventilator to do.

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