JP2008260392A - Vehicular ventilator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular ventilator which prevents a battery from being dead even after turning off an ignition switch, is effectively functioned, and adequately adjusting the temperature in a cabin. <P>SOLUTION: The vehicular ventilator comprises: a solar battery 11 (a solar power generation means); a fan 16 for ventilating a cabin by using the power of the solar battery 11; an inside air temperature sensor 22 (an in-cabin temperature detection means) which is operated to detect the temperature in the cabin while an ignition switch IG is turned on; and a solar ventilation controller 21. The solar ventilation controller 21 detects the electric power energy by the power generation of the solar battery 11 after turning off the ignition switch IG, estimates the temperature in the cabin after turning off the ignition switch IG according to the electric power energy and the detected temperature in the cabin, and drives the fan 16 when the estimated temperature in the cabin is equal to or higher than a predetermined set value, and stops the drive of the fan 16 when the estimated temperature in the cabin is below the predetermined set value. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle ventilator, and more particularly to a vehicle ventilator that can automatically ventilate after an ignition switch is turned off.

As this type of vehicle ventilator, for example, as described in Patent Document 1 below, when a vehicle interior temperature becomes equal to or higher than a predetermined temperature by a room temperature sensor, a blower fan of an existing air conditioner mounted on the vehicle is used. Those that drive automatically are known. Further, as described in, for example, Patent Document 2 below, there is also known a device that drives a fan of a ventilator using a solar cell on the condition that a manual switch is turned on.
Japanese Utility Model Publication No. 5-32034 JP-A-62-261520

  However, since the vehicle ventilation device described in Patent Document 1 drives the controller and blower fan of an existing air conditioner, the battery may rise when the ignition switch is off. On the other hand, in the vehicle ventilator described in Patent Document 2, the fan of the ventilator is driven using the electric power of the solar cell, so that the risk of battery exhaust is eliminated. However, since the vehicle ventilation device described in Patent Document 2 is configured to maintain the drive of the fan if the manual switch is on, the power consumption of the solar cell is fast. For this reason, there is a high possibility that the drive of the fan is stopped early, and the ventilation device may not function effectively.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle ventilator that can adjust the vehicle interior temperature appropriately by causing the ventilator to function effectively even after the ignition switch is turned off.

Means for Solving the Problems and Effects of the Invention

  In order to solve the above-described problems, a vehicle ventilator according to the present invention includes a solar power generation unit capable of generating power using sunlight, a fan for ventilating a vehicle interior using electric power generated by the solar power generation unit, and an ignition. A vehicle interior temperature detecting means for detecting the vehicle interior temperature when the switch is on, an electric energy detecting means for detecting the electric energy generated by the solar power generating means after the ignition switch is turned off, and the vehicle interior temperature detecting means. Temperature estimation means for estimating the temperature in the vehicle interior after the ignition switch is turned off according to the detected vehicle interior temperature and the amount of power detected by the power amount detection means, and the vehicle interior temperature estimated by the temperature estimation means Is driven above the predetermined set value, the fan is driven, and when the estimated vehicle interior temperature is less than the predetermined set value, Characterized in that a fan drive control means for stopping the driving of § emissions.

  In this vehicle ventilator, the fan is driven by the fan drive control means using the power generated by the solar power generation means to ventilate the vehicle interior. For this reason, since the controller and blower fan of the existing air conditioner are not used, it is possible to prevent the battery from running out due to the driving of the fan.

  Further, in this vehicle ventilator, the vehicle interior temperature when the ignition switch is on is detected by the vehicle interior temperature detection means, and the electric energy generated by the solar power generation means after the ignition switch is turned off is detected by the electric energy detection means. Then, the vehicle interior temperature is estimated according to the detected vehicle interior temperature and electric energy by the temperature estimating means. Then, the fan drive control means drives the fan when the estimated vehicle interior temperature is equal to or higher than a predetermined set value, and stops driving the fan when the estimated vehicle interior temperature becomes less than the predetermined set value. The

  Therefore, the fan is driven or stopped depending on the magnitude relationship between the estimated vehicle interior temperature and the predetermined set value, so that the power of the solar power generation means is not wasted. As a result, it is possible to avoid a situation in which the drive of the fan is stopped early, and the ventilator can function effectively.

  In carrying out the present invention, the vehicle interior temperature detecting means is an internal air temperature sensor of an air conditioning unit, and the temperature estimating means is a temperature rise of the vehicle interior temperature in accordance with the amount of power detected by the power amount detecting means. The vehicle interior temperature detected by the internal air temperature sensor and the temperature increase calculated by the increase calculation unit are added, and this added value is set as the first estimated temperature. A first estimated temperature setting means, wherein the fan drive control means drives the fan when the first estimated temperature set by the first estimated temperature setting means is equal to or higher than the set value, and the first estimated temperature is set. It is also possible to set so that the driving of the fan is stopped when the temperature becomes lower than the set value.

  According to this, the temperature increase of the vehicle interior temperature is calculated by the increase calculation means according to the detected electric energy, and the detected vehicle interior temperature and the calculated temperature increase are calculated by the first estimated temperature setting means. A value added to the minute is set as the first estimated temperature. Then, the fan drive control means drives the fan when the set first estimated temperature is equal to or higher than the predetermined set value, and stops driving the fan when the first estimated temperature becomes less than the predetermined set value. .

  In summer, it is common for the air conditioning unit to be in an operating state when the ignition switch is on and power is supplied from a battery mounted on the vehicle. Appropriate temperature control is performed based on Therefore, if an internal air temperature sensor is used as the vehicle interior temperature detection means, a temperature extremely close to the vehicle interior temperature when the ignition switch is turned off can be detected. On the other hand, since the operation of the air conditioning unit is stopped after the ignition switch is turned off, the passenger compartment temperature rises due to sunlight. At this time, the temperature rise of the passenger compartment temperature and the amount of power generated by the solar power generation means have a predetermined correspondence relationship, and the temperature rise of the passenger compartment temperature is calculated based on the amount of power generated by the power generation of the solar power generation means. Is possible. As a result, the first estimated temperature, which is the sum of the vehicle interior temperature detected by the internal air temperature sensor and the temperature increase, is close to the vehicle interior temperature after the ignition switch is turned off, and is estimated. The accuracy of the vehicle interior temperature can be improved.

  In the implementation of the present invention, the temperature estimation means is further set by a decrease calculation means for calculating a temperature decrease of the passenger compartment temperature according to the driving time of the fan and the first estimated temperature setting means. Subtracting the temperature decrease calculated by the decrease calculation unit from the first estimated temperature and setting the subtraction value as a second estimated temperature; and a fan drive control unit comprising: The fan is driven when the second estimated temperature set by the second estimated temperature setting means is equal to or higher than the set value, and the drive of the fan is stopped when the second estimated temperature is less than the set value. It is also possible to set as follows.

  According to this, the temperature decrease amount of the first estimated temperature is calculated by the decrease amount calculating means according to the driving time of the fan, and the first estimated temperature set by the second estimated temperature setting means is calculated. A subtraction value with the descending amount is set as the second estimated temperature. Then, the fan drive control means drives the fan when the set second estimated temperature is equal to or higher than the predetermined set value, and stops driving the fan when the second estimated temperature becomes equal to or lower than the predetermined set value. . As a result, the second estimated temperature that takes into account the temperature drop of the passenger compartment temperature due to the drive of the fan is closer to the passenger compartment temperature after the ignition switch is turned off, and the estimated passenger compartment temperature. Can be further improved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of a vehicle ventilator according to the present invention. In this vehicle ventilator, a solar battery 11 is provided with a ventilation switch 12, a solar ventilation controller 21, a relay 13, and a motor drive circuit 14. The vehicle interior is ventilated by the rotation of the fan 16 driven by the fan motor 15.

The solar battery 11 (solar power generation means) is a solar panel, a solar cell or the like that can generate power by sunlight (for example, the power generation capacity is 1000 W / m ² ) and is incorporated in a sunroof (not shown).

  The ventilation switch 12 is a manual changeover switch provided in the vehicle interior, and switches to an allowable mode in which the ventilation of the vehicle interior by the fan 16 is allowed by an ON operation, and the ventilation of the vehicle interior by the fan 16 is prohibited by an OFF operation. Switch to prohibited mode.

  The relay 13 is an electromagnetic switch. When the ignition switch IG is turned on, the power of the battery B mounted on the vehicle is switched to a state where the power can be supplied to the motor drive circuit 14, and when the ignition switch IG is turned off, the power of the solar battery 11 is switched. Is switched to a state where it can be supplied to the motor drive circuit 14 via the solar ventilation controller 21.

  The motor drive circuit 14 is connected to the solar ventilation controller 21 and drives the fan motor 15 in accordance with a control signal output from the solar ventilation controller 21. The fan motor 15 and the fan 16 are attached to a trunk room, a floor portion, a ceiling portion, and the like of the vehicle, and discharge air in the vehicle interior to the outside of the vehicle.

  The solar ventilation controller 21 has a microcomputer composed of a CPU, ROM, RAM, and the like as main components, and repeatedly executes the fan drive control program of FIG. 2 stored in the ROM etc. every predetermined time after the ignition switch IG is turned off. Then, a control signal corresponding to the execution is output to the motor drive circuit 14.

  The solar ventilation controller 21 is supplied with electric power from the battery B when the ignition switch IG is turned on, and is supplied with power from the solar battery 11 when the ignition switch IG is turned off. An internal air temperature sensor 22 is connected to the solar ventilation controller 21.

  The inside air temperature sensor 22 constitutes an existing air conditioning unit (not shown) mounted on the vehicle, and operates when the ignition switch IG is turned on and the air conditioning unit is turned on. Is output to the solar ventilation controller 21 every predetermined time. The solar ventilation controller 21 stores the detected vehicle interior temperature in a RAM or the like while rewriting it as needed.

  Next, the operation of the embodiment configured as described above will be described. The solar ventilation controller 21 repeatedly executes the fan drive control program of FIG. 2 every predetermined short time after the ignition switch IG is turned off.

  The fan drive control program starts to be executed in step S10. First, the case where the ventilation switch 12 is off will be described. In this case, “No” is determined in step S11, and the execution of the fan drive control program is terminated in step S21.

  Next, a case where the ventilation switch 12 is turned on will be described. In this case, it determines with "Yes" in step S11, and performs the process after step S12.

  In step S12, the vehicle interior temperature Tcabin detected by the internal air temperature sensor 22 and stored in the RAM or the like is input. In step S13, both a temperature increase ΔTsun and a temperature decrease ΔTfan described later are initially set to zero. In step S14, a temperature rise ΔTsun is calculated. That is, the solar ventilation controller 21 refers to the power amount table and the temperature table provided in the ROM, and calculates a temperature increase ΔTsun corresponding to the amount of power generated by the solar battery 11 after the ignition switch IG is turned off. .

  As shown in FIG. 3, the power amount table stores the power amount of the solar battery 11 having characteristics indicating a substantially constant power amount up to a predetermined voltage for each predetermined current value. Further, as shown in FIG. 4, the temperature table stores a temperature increase ΔTsun that increases approximately proportionally as the amount of power of the solar battery 11 increases. Instead of using this temperature table, a temperature rise that changes according to the amount of electric power may be defined in advance using a function, and the temperature rise may be calculated using this function.

  In step S15, an addition value (= Tcabin + ΔTsun) of the vehicle interior temperature Tcabin acquired by the process of step S12 and the temperature increase ΔTsun acquired by the process of step S14 is newly set as the first estimated temperature Tcabin.

  In step S16, it is determined whether or not the first estimated temperature Tcabin is lower than a predetermined temperature Tfan (set value). The predetermined temperature Tfan is set to a predetermined large temperature (for example, 30 ° C.) considered to require ventilation in the vehicle interior. At the first execution of this fan drive control program, the first estimated temperature Tcabin becomes a value sufficiently smaller than the predetermined temperature Tfan due to the effect of the operation of the air conditioning unit before the ignition switch IG is turned off. In step S21, the execution of the fan drive control program is terminated without driving the fan motor 15 by executing the process in step S17. Thereafter, as long as the state where the first estimated temperature Tcabin is lower than the predetermined temperature Tfan continues, the processes of steps S11 to S17 are repeatedly executed, and the drive stop state of the fan motor 15 is maintained.

  When the first estimated temperature Tcabin becomes equal to or higher than the predetermined temperature Tfan due to the increase in the passenger compartment temperature due to sunlight from the state where the first estimated temperature Tcabin is lower than the predetermined temperature Tfan, “No” is determined in step S16. Then, the processing after step S18 is executed.

  In step S <b> 18, a control signal for driving the fan motor 15 is output to the motor drive circuit 14. The motor drive circuit 14 sends a current of a predetermined magnitude to the fan motor 15 and rotationally drives the fan 16 to ventilate the vehicle interior.

  In step S19, a temperature drop ΔTfan is calculated. That is, the solar ventilation controller 21 calculates a temperature decrease ΔTfan corresponding to the driving time of the fan 16 with reference to a temperature table provided in the ROM. As shown in FIG. 5, this temperature table stores a temperature drop ΔTfan that increases almost proportionally as the driving time of the fan 16 increases. This temperature drop ΔTfan is set in consideration of the temperature rise of the passenger compartment temperature due to sunlight during the drive time of the fan 16. Instead of using this temperature table, a temperature decrease that changes according to the driving time of the fan 16 is defined in advance by a function, and the temperature decrease is calculated using the function. Also good.

  In step S20, a subtraction value (= Tcabin−ΔTfan) between the first estimated temperature Tcabin acquired by the process of step S15 and the temperature decrease ΔTfan acquired by the process of step S19 is newly set as the second estimated temperature Tcabin. To do. As long as the state where the second estimated temperature Tcabin is equal to or higher than the predetermined temperature Tfan continues, the processes of steps S16 and S18 to S20 are repeatedly executed and the driving state of the fan motor 15 is maintained.

  If the second estimated temperature Tcabin is lower than the predetermined temperature Tfan, “Yes” is determined in step S16, and the drive of the fan motor 15 is stopped in step S17. After step S17, the fan drive control program is terminated in step S21.

  As is apparent from the above description, in the present embodiment, the vehicle interior temperature Tcabin when the ignition switch IG is on is detected by the process of step S12. Through the process of step S14, the amount of power generated by the power generation of the solar battery 11 after the ignition switch IG is turned off is detected, and the temperature increase ΔTsun of the vehicle interior temperature is calculated according to the detected amount of power of the solar battery 11.

  Further, by the process of step S15, an added value of the detected vehicle interior temperature Tcabin and the calculated temperature rise ΔTsun is set as the first estimated temperature Tcabin. By the process of step S19, the temperature decrease of the first estimated temperature Tcabin is calculated according to the driving time of the fan 16, and the estimated first estimated temperature Tcabin and the calculated temperature decrease ΔTfan are calculated by the process of step S20. Is set as the second estimated temperature Tcabin.

  Then, by the processes of steps S16 to S18, the fan 16 is driven when the first or second estimated temperature Tcabin is equal to or higher than the predetermined set value Tfan, and the first or second estimated temperature Tcabin is less than the predetermined set value Tfan. When this happens, the drive of the fan 16 is stopped.

  Accordingly, the fan 16 is driven or stopped according to the magnitude relationship between the estimated first or second estimated temperature Tcabin and the predetermined set value Tfan, so that the power of the solar battery 11 is wasted. Disappear. As a result, the situation where the drive of the fan 16 is stopped early can be avoided, and the ventilator can function effectively.

  Further, the first estimated temperature Tcabin is close to the vehicle interior temperature after the ignition switch IG is turned off, and the second estimated temperature Tcabin is closer to the vehicle interior temperature after the ignition switch IG is turned off. Value. Thereby, the precision of the estimated vehicle interior temperature improves.

  In the above embodiment, the second estimated temperature Tcabin is estimated to be the vehicle interior temperature after the process of step S18 is executed once. However, the present invention is not limited to this. For example, the processes of steps S19 and S20 are performed. The first estimated temperature Tcabin may be estimated to be the passenger compartment temperature even after the process of step S18 is executed.

1 is a block diagram showing an embodiment of a vehicle ventilation device according to the present invention. The flowchart which shows the fan drive control program performed by the solar ventilation controller of FIG. Explanatory drawing which shows the electric energy table used in order to calculate the electric energy of the solar battery of FIG. Explanatory drawing which shows the temperature table used in order to calculate the temperature rise part of vehicle interior temperature. Explanatory drawing which shows the temperature table used in order to calculate the temperature fall part of vehicle interior temperature.

Explanation of symbols

11 Solar battery (solar power generation means)
12 Ventilation switch 13 Relay 14 Motor drive circuit 15 Fan motor 16 Fan 21 Solar ventilation controller (electric energy detection means, temperature estimation means, fan drive control means)
22 Inside air temperature sensor (vehicle compartment temperature detection means)

Claims (3)

Solar power generation means capable of generating power by sunlight,
A fan that ventilates the vehicle interior using the electric power generated by the solar power generation means;
A vehicle interior temperature detecting means for detecting the vehicle interior temperature when the ignition switch is on;
A power amount detecting means for detecting the amount of power generated by the solar power generating means after the ignition switch is turned off;
Temperature estimation means for estimating the vehicle interior temperature after the ignition switch is turned off according to the vehicle interior temperature detected by the vehicle interior temperature detection means and the amount of power detected by the power amount detection means;
The fan is driven when the vehicle interior temperature estimated by the temperature estimation means is equal to or higher than a predetermined set value, and the fan drive is stopped when the estimated vehicle interior temperature is less than a predetermined set value. A vehicle ventilator comprising fan drive control means. The vehicle interior temperature detection means is an internal air temperature sensor of an air conditioning unit,
The temperature estimation means includes an increase calculation means for calculating an increase in temperature of the passenger compartment temperature according to the amount of electric power detected by the electric energy detection means,
A first estimated temperature setting means for adding the vehicle interior temperature detected by the inside air temperature sensor and the temperature increase calculated by the increase calculation means and setting the added value as a first estimated temperature; ,
The fan drive control means drives the fan when the first estimated temperature set by the first estimated temperature setting means is equal to or higher than the set value, and when the first estimated temperature becomes less than the set value. The vehicle ventilation device according to claim 1, wherein the vehicle ventilation device is set to stop driving of the fan. The temperature estimating means further includes a decreasing amount calculating means for calculating a temperature decreasing amount of the passenger compartment temperature according to the driving time of the fan
Second estimated temperature setting means for subtracting the temperature decrease calculated by the decrease calculation means from the first estimated temperature set by the first estimated temperature setting means and setting this subtraction value as the second estimated temperature. And
The fan drive control means drives the fan when the second estimated temperature set by the second estimated temperature setting means is equal to or higher than the set value, and when the second estimated temperature becomes less than the set value. The vehicle ventilation device according to claim 2, wherein the vehicle ventilation device is set to stop driving of the fan.

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