JP2005088752A - Driving battery cooling control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To adjust the interior temperature quickly when the driving of a vehicle is to be started. <P>SOLUTION: A hybrid vehicle equipped with a battery 3 as a power source for the vehicle to run is equipped with a cooling passage 5 leading from inside the cabin 9 to the outside and furnished with the battery 3 in its position different from the cabin 9, a bypass passage 6 branching on the way of the cooling passage 5 and detouring round the battery, changeover means 7a-7d installed in the branch part or around the convergence part of the cooling passage 5 and performing changing-over of the passage, a blowing means 4 installed in the cooling passage 5 and sending the air to the cooling passage 5 from inside the cabin 9, or into the cabin 9 from the cooling passage 5, and a controlling means 14 to control the drive of the changeover means 7a-7d and the blowing means 4 in accordance with the intra-cabin temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an apparatus for forcibly cooling a battery, which is a driving source for driving a vehicle, with cooling air.

In a hybrid vehicle having an electric motor for driving a vehicle and an engine, a duct is provided that communicates between the passenger compartment and the trunk room, a driving battery is disposed in the duct, and when the battery temperature becomes a predetermined value or more, Patent Document 1 describes a technique of introducing air in a vehicle compartment into a battery through a duct and cooling the battery.
JP-A-11-195437

  However, in the method described in Patent Document 1, in a situation where the outside air temperature is high, for example, in summer, and the temperature in the vehicle interior rises during parking, the vehicle interior temperature is very low even if the air conditioner is activated at the start of vehicle operation. However, if air in the vehicle compartment is introduced into the battery in this state, high-temperature air is introduced into the battery, resulting in a rise in battery temperature and a decrease in performance.

  Accordingly, an object of the present invention is to quickly reduce the temperature in the passenger compartment even when the passenger compartment becomes hot.

  A vehicle battery cooling device according to the present invention is a hybrid vehicle including a battery as a power source for driving a vehicle. The cooling system includes a cooling passage that communicates a vehicle interior with the outside of the vehicle, and disposes the battery in a portion different from the vehicle interior. A bypass passage that branches off from the middle of the cooling passage, bypasses the battery, a switching means that is interposed in at least one of the cooling passage and in the vicinity of the junction, and switches the passage, and the cooling passage A blowing means that is interposed and flows air from the vehicle interior to the cooling passage or from the cooling passage to the vehicle interior; and a control means that controls the driving of the switching means and the air blowing means according to the vehicle interior temperature; Have

  According to the present invention, the driving of the passage switching means and the air blowing means is controlled according to the vehicle interior temperature. For example, when the vehicle interior temperature rises during parking as in summer, the air in the vehicle interior is bypassed. Since the air is forcibly discharged to the outside through the vehicle, the cooling efficiency of the air conditioner at the start of vehicle operation can be increased.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a schematic view of a cooling device according to the present embodiment, in which 1 is a trunk room, 2a is a rear parcel part which is a partition wall between the vehicle interior 9 and the trunk room 1, 2b is a rear seat, 5 is an opening 5a in the rear parcel part 2. And a cooling duct that communicates between the passenger compartment 9 and the trunk compartment 1.

  A battery 3 as a power source for driving the vehicle is disposed in the trunk room 1.

  In the cooling duct 5, a cooling fan 4 that sucks air in the vehicle interior 9 and a battery 3 that is a drive source of the vehicle are arranged downstream thereof.

  The cooling duct 5 is provided with a bypass passage 6 that bypasses the battery 3 and communicates the upstream and downstream sides of the battery 3, and a solenoid and the like are provided at a branching portion and a joining portion of the cooling duct 5 and the bypass passage 6. Switching flaps 7a to 7d driven by the above are provided, and each of these flaps is controlled as will be described later, so that air flows only in one of the cooling duct 5 and the bypass passage 6.

  The discharge port 5b of the cooling duct 5 opens in the trunk room 1 or outside the vehicle.

  Next, control of the cooling system will be described with reference to FIGS.

  FIG. 2 is a schematic diagram of the control system, and FIG. 3 is a control flowchart of the present embodiment.

  As shown in FIG. 2, a battery SOC sensor 10 that detects the state of charge (SOC) of the battery 3, a vehicle interior temperature sensor 11 that detects the temperature in the vehicle interior, a coolant temperature sensor 12 that detects the engine coolant temperature, and a key switch A signal from the key ON sensor 13 that detects the state of being turned on or the state where the door key is unlocked by remote control is output to the control unit (CPU) 14, and the CPU 14 is based on these signals. Driving / stopping of the cooling fan 4 and opening / closing control of the switching flaps 7a to 7d are performed according to the flowchart of FIG.

  In FIG. 3, in step S100, it is determined whether or not the key switch is turned on or the door key is unlocked by the remote key, that is, whether or not the vehicle will travel from now on.

  If the key switch is turned on or unlocked by the remote key in step S100, the process proceeds to step S101, where it is determined whether the engine coolant temperature is a specified value, for example, 50 ° C. or higher.

  If the cooling water temperature is equal to or higher than the specified value, the process proceeds to step S102. If the cooling water temperature is equal to or lower than the specified value, the process proceeds to step S109.

  In step S109, it is determined whether or not the battery SOC is equal to or greater than a predetermined value. This specified value is set by previously obtaining a value corresponding to a battery charge sufficient to drive a cooling fan 4 and flaps 7a to 7d to be described later.

  If the battery SOC is greater than or equal to the specified value, the process proceeds to step S102. If the battery SOC is less than the specified value, the process proceeds to step S110. After starting the engine, the process proceeds to step S102.

  In step S102, it is determined whether or not the temperature in the passenger compartment 9 is higher than a predetermined upper limit specified value. If the temperature is equal to or higher than the predetermined value, the process proceeds to step S113. The upper limit specified value used here is set in advance by experimentally determining an upper limit temperature at which a cooling effect is obtained when the cooling duct 5 is introduced into the battery 3.

  In step S113, the flaps 7a and 7d on the bypass passage side are opened, the flaps 7b and 7c on the battery side are closed, and in step S114, the cooling fan 4 is rotated forward (direction in which the air in the vehicle compartment 9 is introduced into the cooling duct 5). Thereby, when the temperature in the passenger compartment is high, such as in summer, it is possible to increase the cooling efficiency of the air conditioner by discharging the hot air in the passenger compartment 9 to the outside of the passenger compartment. Further, at this time, the hot air is discharged through the bypass passage 6, so that the battery 3 can be prevented from being heated by the hot air.

  When the temperature of the vehicle interior 9 is lower than the upper limit specified value in step S102, it is determined in step S103 whether the temperature of the vehicle interior 9 is lower than the lower limit specified value. The specified value for the lower limit used here is set in advance to a temperature that requires heating by heating during vehicle operation.

  When the temperature in the passenger compartment 9 is equal to or lower than the lower limit specified value, the process proceeds to step S104, the temperature of the battery 3 is increased by starting the hybrid system (HEV system), and the flap 7a on the bypass passage side in step S105, 7d is closed, the battery-side flaps 7b and 7c are opened, and the cooling fan 4 is reversely rotated (the direction in which air is sent from the trunk room 1 side to the vehicle interior 9) in step S106. As a result, when the temperature of the vehicle interior 9 is low, such as in winter, the heat generated by the battery 3 when the HEV system is activated can be introduced into the vehicle interior 9 to efficiently warm the vehicle interior 9.

  When the temperature of the vehicle interior 9 is higher than the lower limit specified value in step S103, the process proceeds to step S111, the flaps 7a, 7d on the bypass passage side are closed, the flaps 7b, 7c on the battery side are opened, and the cooling fan 4 is opened in step S112. Rotate forward. Thereby, the air of the vehicle interior 9 can be introduce | transduced into the battery 3, and the battery 3 can be cooled.

  When the cooling fan 4 is driven in the above steps S106, S112, and S114, the process proceeds to step S107, the temperature of the vehicle interior 9 is compared with a preset temperature, and when the temperature of the vehicle interior 9 becomes substantially equal to the set value, in step S108. The cooling fan 4 is stopped.

  As described above, in this control, the rotation direction of the cooling fan 4 and the opening / closing of the flaps 7a to 7d are controlled based on the temperature of the vehicle interior 9, and when the vehicle interior 9 is hot, the air in the vehicle interior 9 is bypassed. When the vehicle interior 9 is discharged from the passage 6 and the vehicle interior 9 is low in temperature, the heat of the battery 3 is introduced into the vehicle interior 9, and the temperature of the vehicle interior 9 is between the lower limit set value and the upper limit set value, that is, the vehicle interior. When it is not necessary to warm the temperature of 9 and it is lower than the temperature of the battery 3, the air in the vehicle interior 9 is introduced into the battery 3 to cool the battery 3.

  As described above, in the present embodiment, when the temperature of the vehicle interior 9 becomes high during parking as in summer, the hot air in the vehicle interior 9 is forcibly discharged to the outside by the cooling fan 4 before driving the vehicle. When the air conditioner is used, the passenger compartment temperature can be quickly lowered.

  Since the hot air in the passenger compartment 9 is discharged through the bypass passage 6 that bypasses the battery 3, it is possible to prevent the battery 3 from being heated.

  When the temperature of the vehicle interior 9 becomes low during parking, as in winter, the HEV system is activated and the cooling fan 3 is reversed so that the heat of the battery 3 is drawn into the vehicle interior 9. The temperature in the passenger compartment 9 can be quickly increased.

  When the SOC of the battery 3 is high, the HEV system can be started and the cooling fan 4 and the flaps 7a to 7d can be driven without starting the engine. Ventilation can be started early by a signal from outside the vehicle.

  Since ventilation is possible with the window closed, the passenger compartment 9 can be kept comfortable even on rainy days.

  Even when the window is fogged during traveling or the like, the fog of the window can be eliminated by forcibly discharging the air in the vehicle interior 9 by the cooling fan 4.

  By introducing into the battery 3 the air in the passenger compartment 9 whose temperature has been adjusted by the air conditioner while the vehicle is running, the battery 3 that has generated heat by power generation can be cooled.

  The present invention is not limited to the above-described embodiments, and it goes without saying that various modifications can be made within the scope of the technical idea described in the claims.

  The present invention can be applied to a hybrid vehicle having an electric motor and an engine as a drive source for traveling the vehicle.

It is a figure which shows the example of the vehicle mounting state of this cooling device. It is the schematic of the control system of this cooling device. It is a control flowchart of this cooling device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Trunk room 2a Rear parcel part 2b Rear seat 3 Battery 4 Cooling fan 5 Cooling duct 6 Bypass passage 7a-7d Flap 8 Rear glass 9 Car interior 10 Battery SOC sensor 11 Car interior temperature sensor 12 Cooling water temperature sensor 13 Key ON (or remote key unlocking) ) Sensor 14 Control unit (CPU)

Claims (5)

In a hybrid vehicle including a battery as a power source for vehicle travel,
A cooling passage that communicates between the vehicle interior and the exterior of the vehicle and interposes the battery disposed in a different part from the vehicle interior;
A bypass passage branching from the middle of the cooling passage to bypass the battery;
A switching means that is interposed at least in one of the cooling passages or near the junction and switches the passages;
A blower means interposed in the cooling passage, for flowing air from the vehicle interior to the cooling passage, or from the cooling passage to the vehicle interior;
A vehicle battery cooling control apparatus, comprising: a control unit that controls driving of the switching unit and the blowing unit in accordance with a vehicle interior temperature.   2. The cooling of the vehicle battery according to claim 1, wherein the control unit is capable of receiving the signal from the outside and supplying the electric power from the battery to drive the blowing unit even when the vehicle is parked. Control device.   The control means drives the switching means to close the passage of the cooling passage to the battery and connect the bypass passage when the vehicle interior temperature is equal to or higher than a predetermined upper limit. The cooling device for a vehicle battery according to claim 1 or 2, wherein the air blowing unit is driven so that indoor air is discharged outside the vehicle without passing through the battery.   The control means drives the switching means to communicate the passage of the cooling passage to the battery and close the bypass passage when the vehicle interior temperature is equal to or less than a predetermined lower limit value. The vehicle battery cooling device according to claim 1 or 2, wherein the air blowing means is driven so as to introduce the air into the vehicle compartment, and air outside the vehicle is introduced into the vehicle compartment through the battery.   The said control means is a cooling device of the vehicle battery of Claim 3 or 4 which stops the said ventilation means, if the vehicle interior temperature becomes the preset temperature.

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