JP4096885B2 - Cooling device for power conversion mechanism mounted on vehicle - Google Patents

Description

  The present invention relates to a cooling device for an electric device mounted on a hybrid vehicle, and more particularly, to a cooling device that suppresses a temperature rise of the electric device without stimulating a passenger's hearing.

  Usually, in vehicles such as EVs (Electric Vehicles) and HVs (Hybrid Vehicles), driving force by electric energy generates three-phase AC power from a high-voltage battery (hereinafter referred to as a main battery) by an inverter. It is obtained by rotating the phase AC motor. Further, when the vehicle is decelerated, the regenerative energy obtained by the regenerative operation of the three-phase AC motor is stored in the main battery, so that the vehicle travels without wasting energy.

  In addition, in such a vehicle, an auxiliary battery that supplies electric power to auxiliary electrical components such as a lighting device, an ignition device, and an electric pump is mounted in addition to the high-voltage main battery. The auxiliary battery is, for example, a low voltage battery represented by a lead storage battery. The auxiliary battery is charged by the electric power generated by the alternator or is charged by the electric power from the main battery. When the auxiliary battery is charged with power from the main battery, the voltage is stepped down by the DC / DC converter.

  In many cases, a nickel metal hydride battery or a lithium ion battery is mainly used for such a main battery. When the main battery is charged and discharged, reaction heat is generated by a chemical reaction, and the battery temperature rises. As the battery temperature rises, there arises a problem that the performance of the battery is lowered or the battery is deteriorated to shorten its life. For this reason, in order to avoid this, the main battery is ventilated and cooled. In addition, the inverter and the DC / DC converter also generate heat by the power element, so that cooling is necessary.

  For this reason, in such a vehicle, a cooling fan for cooling a battery and a cooling fan for cooling a PCU (Power Control Unit) such as an inverter or a DC / DC converter are mounted. Depending on the driving state of the vehicle, the operating sound of the cooling fan may stimulate the hearing of the vehicle occupant and cause discomfort to the vehicle occupant.

  Japanese Patent Laying-Open No. 2003-178815 (Patent Document 1) discloses a vehicle device that can cool a battery and eliminate temperature variations among a plurality of batteries. This vehicle apparatus stores a motor that assists driving of a vehicle or an output of an engine for a vehicle, power generation energy when the motor is used as a generator, and regenerative energy obtained by regenerative operation of the motor when the vehicle is decelerated. In a vehicle device comprising a plurality of connected batteries and a blower that blows air to the batteries, temperature detecting means for detecting the temperature of each battery, temperature difference calculating means for calculating a temperature difference between the batteries, and between the batteries Based on the temperature difference, setting means for setting the energization amount to the blower, speed detection means for detecting the traveling speed of the vehicle, and limiting means for limiting the energization amount in accordance with the traveling speed of the vehicle.

According to this vehicle device, the energization amount of the blower is set based on the temperature difference between the batteries of the plurality of batteries connected to each other, and the energization amount of the blower is changed according to the traveling speed of the vehicle. Can be controlled. Therefore, when a temperature variation (temperature difference) occurs between a plurality of batteries mounted on the vehicle, the air flow is generated by the air blown by the blower, thereby reducing the temperature of each battery. In addition, the temperature variation between the batteries can be eliminated. Furthermore, the amount of blown air can be controlled in accordance with the running speed of the vehicle so as to maintain a blown sound that does not cause discomfort to the passengers of the vehicle.
JP 2003-178815 A

  However, in the vehicle device disclosed in Patent Document 1, a cooling fan that can obtain an audible fan operating sound that the vehicle occupant does not feel as a noise with respect to the vehicle speed based on the vehicle speed information acquired from the vehicle speed sensor. The control duty value is obtained. That is, when the high-voltage battery is ventilated and cooled using a cooling fan, the amount of air flow is maintained while maintaining the operating sound (air blowing sound) of the cooling fan that does not cause discomfort to the vehicle occupant according to the traveling speed of the vehicle. The duty value is calculated so that the control can be performed. Furthermore, when the temperature of the main battery exceeds a predetermined upper limit temperature, the air volume control of the blower is controlled based on the temperature of the main battery so that the performance of the main battery is not deteriorated. Temperature control can be performed. Such control has the following problems.

  As a first problem, in such control, only a control duty value that can obtain a fan operating sound of an audible level that the passenger does not feel as noise can be obtained based only on road noise corresponding to the vehicle speed. . That is, factors that cancel out fan operating noise other than vehicle speed are not considered. By considering various factors, the control duty value can be further calculated to increase the air flow rate, but this is not taken into consideration.

  As a second problem, in such control, as an exceptional measure, only when the temperature of the main battery exceeds a predetermined upper limit temperature, a fan operating sound of an audible level that the passenger feels as noise is generated. Therefore, the air flow rate of the blower is increased. For example, with such control, the cooling capacity is increased by increasing the air flow after the temperature of the battery or PCU that is actually the object to be cooled rises. It takes time for the temperature to actually drop. During that time, excessive temperature increases may be reached.

  The present invention has been made in order to solve the above-described problems, and an object of the present invention is a cooling device for a power conversion mechanism mounted on a vehicle, which gives an uncomfortable feeling to a passenger of the vehicle. It is providing the cooling device of the power conversion mechanism mounted in the vehicle which can suppress an excessive temperature rise beforehand.

  A cooling device for a power conversion mechanism according to a first aspect cools a power conversion mechanism mounted on a vehicle. This cooling device detects a state of the vehicle that is a factor that suppresses noise generated by the operation of the supply unit and a supply unit for supplying a cooling medium to the power conversion mechanism with respect to the hearing of the vehicle occupant. Vehicle state detection means for calculating the allowable capacity of the supply means based on the vehicle state, and control means for controlling the supply means so as not to exceed the allowable capacity.

  According to the first invention, the vehicle state detection means suppresses the operating noise of the supply means (for example, an electric fan) that supplies a cooling medium such as cooling air to the power conversion device against the hearing of the vehicle occupant. For example, the state of the vehicle speed, the engine speed, the air flow rate of the indoor air conditioner, and the like is detected. The calculating means calculates the allowable capacity of the supplying means based on the detected vehicle state. In other words, the higher the vehicle speed, the greater the road noise, the higher the engine speed, the louder the engine sound, and the larger the air volume of the indoor air conditioner, the louder the sound, the more the operating noise of the electric fan is canceled. The allowable capacity can be calculated higher than in the case of considering. The allowable capacity calculated in this way is maintained. For this reason, the passenger's hearing is not uncomfortable. As a result, it is possible to provide a cooling device for a power conversion mechanism mounted on a vehicle, which can suppress discomfort to the hearing of a passenger of the vehicle.

  In the cooling device for the power conversion mechanism according to the second aspect of the invention, in addition to the configuration of the first aspect, the vehicle state detection means includes the vehicle speed, the number of revolutions of the engine mounted on the vehicle, and the vehicle state. Means for detecting at least one of the blast volumes of the vehicle interior air conditioner are included.

  According to the second aspect of the invention, the detection means detects the speed of the vehicle, the engine speed, and the air volume of the indoor air conditioner. Based on the detected state of the vehicle, the allowable capacity of the supply means is calculated. At this time, the higher the vehicle speed, the greater the road noise, the higher the engine speed, the louder the engine sound, and the larger the air volume of the indoor air conditioner, the louder the sound, the more the operating noise of the electric fan will be canceled. The allowable capacity can be calculated higher than when considering the above.

  A cooling device for a power conversion mechanism according to a third aspect cools a power conversion mechanism mounted on a vehicle. The power converted by the power conversion mechanism is supplied to the power storage mechanism. The cooling device includes a supply unit for supplying a cooling medium to the power conversion mechanism, a storage state detection unit for detecting a storage state of the power storage mechanism, and noise generated by the operation of the supply unit. Vehicle state detection means for detecting the state of the vehicle that is a factor that suppresses the hearing of the vehicle, calculation means for calculating the permissible capacity of the supply means based on the vehicle state, and the storage state are predetermined. Control means for controlling the supply means so as not to exceed the permissible capacity until the state becomes equal to or less than the stored amount of electricity.

  According to the third invention, the vehicle state detection means suppresses the operating noise of the supply means (for example, an electric fan) that supplies a cooling medium such as cooling air to the power conversion device against the hearing of the vehicle occupant. For example, the state of the vehicle speed, the engine speed, the air flow rate of the indoor air conditioner, and the like is detected. The calculating means calculates the allowable capacity of the supplying means based on the detected vehicle state. In other words, the higher the vehicle speed, the greater the road noise, the higher the engine speed, the louder the engine sound, and the larger the air volume of the indoor air conditioner, the louder the sound, the more the operating noise of the electric fan is canceled. The allowable capacity can be calculated higher than in the case of considering. The allowable capacity calculated in this way is maintained until the power storage state (SOC (States Of Charge)) of the power storage mechanism becomes equal to or less than a predetermined value. For this reason, the passenger's hearing is not uncomfortable. On the other hand, when the SOC of the power storage mechanism becomes equal to or lower than a predetermined value, the power conversion mechanism starts to operate, supplies power to the power storage mechanism, and charges the power storage mechanism. Therefore, the temperature of the power conversion mechanism starts to rise. In such a case, the electric fan is controlled while allowing the allowable capacity to be exceeded. For this reason, it is not possible to increase the capacity of the electric fan after detecting that the temperature of the power conversion mechanism has risen. . As a result, it is possible to provide a cooling device for a power conversion mechanism mounted on a vehicle, which can suppress an excessive temperature rise in advance while suppressing discomfort to the hearing of a passenger of the vehicle. .

  In the cooling device for the power conversion mechanism according to the fourth aspect of the invention, in addition to the configuration of the third aspect of the invention, the vehicle state detection means includes the vehicle speed, the number of revolutions of the engine mounted on the vehicle, and the vehicle state. Means for detecting at least one of the blast volumes of the vehicle interior air conditioner are included.

  According to the fourth aspect of the invention, the detecting means detects the speed of the vehicle, the engine speed, and the air volume of the indoor air conditioner. Based on the detected state of the vehicle, the allowable capacity of the supply means is calculated. At this time, the higher the vehicle speed, the greater the road noise, the higher the engine speed, the louder the engine sound, and the larger the air volume of the indoor air conditioner, the louder the sound, the more the operating noise of the electric fan will be canceled. The allowable capacity can be calculated higher than when considering the above.

  In the cooling device for the power conversion mechanism according to the fifth aspect of the invention, in addition to the configuration of the third aspect, the control means is configured to exceed the allowable capacity when the state of charge is equal to or less than a predetermined amount of charge. Acceptably includes means for controlling the supply means.

  According to the fifth invention, when the SOC of the power storage mechanism becomes equal to or less than a predetermined value, the power conversion mechanism starts operating and supplies power to the power storage mechanism in order to charge the power storage mechanism. Therefore, the temperature of the power conversion mechanism starts to rise. In such a case, since the electric fan is controlled by allowing it to exceed the allowable capacity, the electric power conversion mechanism is predicted by raising the capacity of the electric fan to the maximum capacity that exceeds the allowable capacity in advance. An excessive temperature rise can be avoided.

  In the cooling device for a power conversion mechanism according to the sixth invention, in addition to the configuration of any one of the third to fifth inventions, the power conversion mechanism is a DC / DC converter. The power storage mechanism is a low-voltage battery that is charged by receiving power from a high-voltage battery via a DC / DC converter. The storage state detection means includes a means for detecting the state of charge of the low voltage battery.

  According to the sixth aspect of the invention, the vehicle is equipped with a high-voltage main battery for driving the vehicle and a low-voltage auxiliary battery for vehicle auxiliary equipment. During regenerative braking, regenerative power is generated by the motor generator, and the generated power charges the main battery. When the SOC of the auxiliary battery decreases and the SOC of the main battery has a margin, the voltage of the main battery is stepped down by the DC / DC converter and supplied to the auxiliary battery, and the auxiliary battery is charged. In a vehicle equipped with such a hybrid system, an excessive temperature rise of the DC / DC converter can be suppressed in advance, and uncomfortable feelings of the passengers of the vehicle can be suppressed.

  In the cooling device for the power conversion mechanism according to the seventh invention, in addition to the configuration of the sixth invention, the storage state detecting means includes means for detecting the temperature of the low voltage battery, and charging / discharging of the low voltage battery. Means for detecting the current value and means for detecting the state of charge based on the temperature and the charge / discharge current value are included.

  According to the seventh aspect, the state of charge of the auxiliary battery can be detected as the SOC calculated by integrating the charge / discharge current value of the auxiliary battery over time in consideration of the temperature of the auxiliary battery.

  In the cooling device for the power conversion mechanism according to the eighth invention, in addition to the configuration of any one of the first to seventh inventions, the cooling medium is air, and the supply means is a blower fan.

  According to the eighth aspect of the invention, an excessive temperature rise can be suppressed in advance while suppressing discomfort to the hearing of the vehicle occupant in the forced air cooling type power conversion mechanism.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, the same parts are denoted by the same reference numerals. Their names and functions are also the same. Therefore, detailed description thereof will not be repeated.

  With reference to FIG. 1, the control block of the cooling system of the vehicle which concerns on this Embodiment is demonstrated. This vehicle cooling system is a system in which the DC / DC converter 500 is cooled by a cooling fan 700. The cooling target may be an electrical device other than the DC / DC converter 500 (for example, the inverter 300).

  As shown in FIG. 1, the vehicle includes an engine 100, a motor generator 200 that assists the driving force of the vehicle by the engine 100 and generates electric power during regenerative braking, an inverter 300 that supplies electric power to the motor generator 200, Main battery 400 for supplying electric power to motor generator 200 via inverter 300. The main battery is, for example, a battery having a discharge voltage of 200 V to 300 V, for example, in which many nickel metal hydride batteries are connected in series.

  DC / DC converter 500 steps down the power of main battery 400 and supplies power to auxiliary electric load 800 and auxiliary battery 900. The electric power supplied to the auxiliary battery 900 charges the auxiliary battery 900.

  A cooling fan 700 for cooling the DC / DC converter 500 is provided with the auxiliary battery 900 as a power source, and an auxiliary electric load 800 such as a lighting device, an ignition device, and an electric pump is provided with the auxiliary battery 900 as a power source. . The auxiliary battery 900 is, for example, a lead storage battery or the like, and is a 14V battery (charge voltage 14V, discharge voltage 12V).

  Further, the cooling system is provided with an HV_ECU 600 that controls such a hybrid system. The HV_ECU 600 controls the motor generator 200, the inverter 300, and the like, and also controls a cooling fan 700 that is a cooling device for the DC / DC converter 500.

  The HV_ECU 600 is connected to the DC / DC converter 500, transmits an allowable air volume command signal to the DC / DC converter 500, and receives an actual air volume signal from the DC / DC converter 500. The HV_ECU 600 receives a vehicle speed signal, an engine speed signal, and a blower fan air volume command signal for air conditioning.

  The HV_ECU 600 detects the vehicle speed, the engine speed, and the air volume of the air-conditioning blower fan based on the vehicle speed signal, the engine speed signal, and the air-conditioning blower fan air volume command signal. A memory provided in the HV_ECU 600 stores a DC / DC converter allowable air volume map. This DC / DC converter allowable air volume map is such that the larger the air-conditioning blower fan air volume, the higher the vehicle speed, and the higher the engine speed, the greater the vehicle interior noise, so the DC / DC converter allowable air volume also increases. It is.

  The DC / DC converter 500 generates an air volume control signal for the cooling fan 700 based on the allowable air volume command signal input from the HV_ECU 600 and outputs the air volume control signal to the cooling fan 700. The cooling fan 700 controls the rotation speed of the electric motor that rotates the cooling fan 700 based on the air volume command signal input from the DC / DC converter 500. As a result, the air flow rate and operating noise of the cooling fan 700 change.

  The auxiliary battery temperature signal and the auxiliary battery charge / discharge current signal are input to the DC / DC converter 500 from the auxiliary battery 900. DC / DC converter 500 detects the SOC of auxiliary battery 900. At this time, the DC / DC converter 500 considers the influence of the temperature of the auxiliary battery 900 based on the temperature signal of the auxiliary battery, and time-integrates the auxiliary battery charging / discharging current value, thereby obtaining the auxiliary battery. An SOC of 900 is calculated. As will be described in detail later, DC / DC converter 500 generates an air volume control signal based on the allowable air volume command signal input from HV_ECU 600 and the SOC of auxiliary battery 900 and outputs the generated air volume control signal to cooling fan 700.

  A control structure of a program executed by HV_ECU 600 in FIG. 1 will be described with reference to FIG.

  In step (hereinafter step is abbreviated as S) 100, HV_ECU 600 detects an air-conditioning blower fan air volume command value. At this time, the HV_ECU 600 may detect the air-conditioning blower fan air flow command value based on the air-conditioning blower fan air flow command signal and calculate the air-conditioning blower fan air flow from the command value. You may make it detect directly.

  In S110, HV_ECU 600 detects the engine speed based on an engine speed signal input from an engine speed sensor provided in engine 100.

  At S120, HV_ECU 600 detects the vehicle speed based on a vehicle speed signal input from a rotational speed sensor provided on the output shaft of the transmission attached to the output shaft of engine 100.

  In S130, HV_ECU 600 estimates vehicle interior noise using air conditioning blower fan air volume, engine speed, and vehicle speed as parameters. In S140, the HV_ECU calculates an allowable air volume command value based on the vehicle interior noise. As described above, the processing in S130 and 140 calculates the allowable air volume command value of the cooling fan 700 that cools the DC / DC converter 500 based on the DC / DC converter allowable air volume map stored in the HV_ECU 600. is there.

  In S150, HV_ECU 600 outputs an allowable air volume command signal to DC / DC converter 500.

  In S160, HV_ECU 600 determines whether or not an actual air volume signal has been received from DC / DC converter 500. When the actual air volume signal is received from DC / DC converter 500 (YES in S160), the process proceeds to S170. Otherwise (NO in S160), this process ends.

  In S170, HV_ECU 600 displays, for example, a warning light indicating that the cooling fan 700 is generating exceptionally high operating noise as an abnormal process, for example, to the vehicle occupant. Thereafter, the process ends.

  With reference to FIG. 3, a control structure of a program executed by DC / DC converter 500 of FIG. 1 will be described.

  In S200, DC / DC converter 500 detects auxiliary battery temperature TB. At this time, DC / DC converter 500 detects auxiliary battery temperature TB based on an auxiliary battery temperature signal input to DC / DC converter 500 from a temperature sensor provided in auxiliary battery 900.

  In S210, DC / DC converter 500 detects auxiliary battery charge / discharge current value IB. At this time, DC / DC converter 500 calculates auxiliary battery charge / discharge current value IB based on the auxiliary battery charge / discharge current signal input to DC / DC converter 500 from the current sensor provided in auxiliary battery 900. Detect.

  In S220, the auxiliary battery SOC is calculated by integrating the auxiliary battery charge / discharge current value IB over time in consideration of the auxiliary battery temperature TB.

  In S230, it is determined whether or not the SOC is equal to or greater than a predetermined allowable value. If auxiliary battery SOC is equal to or greater than a predetermined allowable value (YES in S230), the process proceeds to S240. If not (NO in S230), the process proceeds to S270.

  In S240, DC / DC converter 500 determines whether or not the allowable air volume command value is greater than or equal to the necessary air volume. This allowable air volume command value is based on an allowable air volume command signal input from HV_ECU 600 to DC / DC converter 500. In addition, the necessary air volume is necessary and sufficient for the DC / DC converter 500 to achieve cooling performance when supplying all the power required by the auxiliary battery 900 and the auxiliary electric load 800 (including the cooling fan 700). The air volume. If the allowable air volume command value is equal to or greater than the required air volume (YES in S240), the process proceeds to S250. If not (NO in S240), the process proceeds to S260.

  In S250, DC / DC converter 500 outputs a control signal to cooling fan 700 so as to cool DC / DC converter 500 with the required air volume. Thereafter, the process ends.

  In S260, DC / DC converter 500 outputs a control signal to cooling fan 700 so as to cool DC / DC converter 500 with an allowable air volume. Thereafter, the process ends.

  In S270, DC / DC converter 500 outputs a control signal to cooling fan 700 so as to cool DC / DC converter 500 with the maximum air volume. In S280, DC / DC converter 500 transmits an actual air volume signal to HV_ECU. Thereafter, the process ends.

  The operation of the cooling system according to the present embodiment based on the above-described structure and flowchart will be described.

  While the vehicle is running, the air-conditioning blower fan air flow command value is detected (S100), the engine speed is detected (S110), and the vehicle speed is detected (S120). An allowable air volume command value for the cooling fan 700 is calculated based on a map using air conditioning blower fan air volume, engine speed, and vehicle speed as parameters (S130, S140). At this time, a map is used in consideration that the interior noise is estimated on the basis of the air volume for the air-conditioning blower fan, the engine speed, and the vehicle speed, and the operating noise of the cooling fan 700 is canceled by the interior noise.

  An allowable air volume command signal is output from HV_ECU 600 to DC / DC converter 500 (S150).

  While the vehicle is running, the auxiliary battery temperature TB is detected (S200), and the auxiliary battery charge / discharge current IB is detected (S210). If the SOC of auxiliary battery 900 is calculated (S220), the SOC is greater than or equal to the allowable value (YES in S230), and the allowable airflow command value is greater than or equal to the required airflow (YES in S240), DC / DC converter 500 The cooling fan 700 for cooling the air is operated with the necessary air volume (S250).

  On the other hand, if the SOC is equal to or greater than the allowable value (YES in S230), but the allowable airflow command value is less than the required airflow (NO in S240), cooling fan 700 that cools DC / DC converter 500 is allowable. It is controlled to operate with the air volume (S260).

  Further, when the SOC is less than the allowable value (NO in S230), control is performed so that cooling fan 700 that cools DC / DC converter 500 operates at the maximum air volume (S270).

  When the cooling fan 700 is operated with the maximum airflow, an actual airflow signal is transmitted from the DC / DC converter 500 to the HV_ECU 600 (S280). The HV_ECU 600 that has received the actual air volume signal from the DC / DC converter (YES in S160) provides a warning light or the like to notify the vehicle occupant that the cooling fan 700 is operating at the maximum air volume as an abnormal process. Turn on (S170).

  As described above, according to the cooling system of the present embodiment, the vehicle speed is a factor that suppresses the operating noise of the cooling fan that supplies cooling air to the DC / DC converter against the hearing of the vehicle occupant. Not only the engine speed but also the air flow rate of the air conditioner in the vehicle interior were taken into consideration. Based on the state of the vehicle, an allowable air volume that is a limit at which the operating noise of the cooling fan does not cause discomfort to the passenger is calculated. For this reason, the allowable air volume can be calculated higher than when only the vehicle speed is considered. The allowable air volume calculated in this way prevents the cooling fan from operating without exceeding the allowable air volume when the SOC of the auxiliary battery is greater than or equal to the allowable value, thereby suppressing discomfort to the passenger's hearing. can do. On the other hand, when the SOC of the auxiliary battery falls below the allowable value, the auxiliary battery is charged from the main battery via the DC / DC converter, so that the element temperature of the DC / DC converter is expected to rise. Instead of operating the cooling fan with the maximum airflow after the temperature of the DC / DC converter 500 actually increases, the cooling fan is cooled with the maximum airflow when the auxiliary battery starts to be charged. Excessive temperature rise of the converter can be avoided.

  In addition, you may make it control a cooling fan, without performing determination of S230 shown to the flowchart of FIG.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

It is a figure which shows the control block of the cooling system of the vehicle which concerns on embodiment of this invention. It is a flowchart which shows the control structure of the program performed by HV_ECU of FIG. It is a flowchart which shows the control structure of the program performed with the DC / DC converter of FIG.

Explanation of symbols

  100 engine, 200 motor generator, 300 inverter, 400 main battery, 500 DC / DC converter, 600 HV_ECU, 700 cooling fan, 800 auxiliary electric load, 900 auxiliary battery.

Claims (6)

A cooling device for cooling a power conversion mechanism mounted on a vehicle, wherein power converted by the power conversion mechanism is supplied to a power storage mechanism,
The cooling device is
Supply means for supplying a cooling medium to the power conversion mechanism;
A power storage state detection means for detecting a power storage state of the power storage mechanism;
Vehicle state detection means for detecting the state of the vehicle, which is a factor that suppresses noise generated by the operation of the supply means against the hearing of passengers of the vehicle;
A calculation means for calculating an allowable capacity of the supply means based on the state of the vehicle;
A power conversion mechanism mounted on a vehicle, including control means for controlling the supply means so as not to exceed the permissible capacity until the power storage state is equal to or less than a predetermined power storage amount. Cooling system. The vehicle state detection means includes means for detecting at least one of the speed of the vehicle, the number of revolutions of an engine mounted on the vehicle, and the amount of air blown from an indoor air conditioner of the vehicle as the state of the vehicle. The cooling device for a power conversion mechanism according to claim 1 . 2. The control unit according to claim 1 , wherein the control unit includes a unit for controlling the supply unit by accepting that the allowable capacity is exceeded when the power storage state is equal to or less than a predetermined power storage amount. Cooling device for power conversion mechanism. The power conversion mechanism is a DC / DC converter,
The power storage mechanism is a low voltage battery that is charged by receiving power from a high voltage battery via the DC / DC converter,
The cooling device for a power conversion mechanism according to any one of claims 1 to 3 , wherein the storage state detection means includes means for detecting a charge state of the low-voltage battery. The storage state detecting means includes
Means for sensing the temperature of the low voltage battery;
Means for detecting a charge / discharge current value of the low voltage battery;
The cooling device for a power conversion mechanism according to claim 4 , further comprising means for detecting a charge state based on the temperature and the charge / discharge current value. The cooling medium is air;
The cooling device for a power conversion mechanism according to claim 1 , wherein the supply unit is a blower fan.

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