JP5076990B2 - Battery warm-up system - Google Patents

Description

  The present invention relates to a battery warm-up system for an electric vehicle such as a hybrid vehicle.

In recent years, electric vehicles such as hybrid vehicles have attracted attention as environmentally friendly vehicles. Some hybrid vehicles and electric vehicles can be charged with a battery that supplies power to the traveling motor using a commercial power source outside the vehicle (plug-in method). When a battery that charges and discharges by a chemical reaction is applied to this hybrid vehicle, etc., the charge / discharge performance of the battery decreases due to a decrease in the chemical reaction characteristics of the battery in a cryogenic environment, resulting in a decrease in vehicle running performance or There was a problem that the distance that can be traveled by charging was shortened. Therefore, in Patent Document 1, for example, a PTC heater is installed around the battery, and the battery is warmed up by energizing the PTC heater when the battery is charged by a commercial power supply (see, for example, Patent Document 1).
JP-A-8-22845

  However, in the battery warming device described in Patent Document 1, it is necessary to install an electric heater dedicated to warming up the battery, and there is a problem that the cost increases due to an increase in the number of electrical parts and the like constituting the vehicle. It was.

  An object of this invention is to provide the battery warming-up system which can warm up a battery, without providing the electric heater only for battery warming up in view of the said point.

In order to achieve the above object, according to the first aspect of the present invention, a travel electric motor (10) for traveling a vehicle, an engine (20) for traveling the vehicle, and an external power source (100) while the vehicle is stopped are provided. The external power source connection means (16) capable of charging the motor drive battery (11) by connection, the air conditioning case (301 ) forming the air passage, the air conditioning case (301 ), and the engine (20) A heating heat exchanger (307 ) for heating the air blown into the passenger compartment by the engine cooling water heated by the exhaust heat, and a circulation circuit for circulating the engine cooling water to the heating heat exchanger (307) and constructed air conditioner (30), provided in the circulation circuit, and then heating the heating electric heater for heating the engine cooling water (406) when energized, is provided in the circulation circuit, a motor drive Heat exchanger disposed adjacent the battery (11) and (11a), a switching valve for switching the flow path of the engine cooling water in the circulation circuit (404, 407), provided with, in a vehicle stopped, the external power supply connection When the motor drive battery (11) is charged by the means (16), if the temperature of the motor drive battery (11) falls below a predetermined temperature, the heating electric heater (406) is energized. In addition, the switching valve (404, 407) is connected to the engine cooling water from the engine (20) → the heating electric heater (406) → the heating heat exchanger (307) → the heat exchanger (11a) → the engine (20). The flow path of the engine cooling water in the circulation circuit is switched so as to flow .

  In this way, while the motor driving battery (11) is being charged, the motor driving battery (11) is warmed up by the heat of the heating electric heaters (307a, 406). The motor drive battery (11) can be warmed up without providing an electric heater.

Further, as in the invention described in claim 2 , in the invention described in claim 1, the power adjusting means (12) for controlling the amount of power supplied from the external power source (100) to the heating electric heater (40 06). ), And the power adjustment means (12) uses at least the electric power supplied from the external power supply (100) for heating the electric power for heating the battery for driving the motor (11) and the electric heater for heating ( 4.06). You may comprise so that it may distribute to electric power.

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. The battery warm-up system of the present embodiment warms up a motor drive battery mounted on a hybrid vehicle, and FIG. 1 is a schematic diagram showing the overall configuration of the battery warm-up system.

  The hybrid vehicle includes a traveling electric motor 10, an engine (water-cooled engine) 20, an air conditioner 30 that air-conditions the passenger compartment, a cooling water system 40 that cools the engine, and the like as a driving source for traveling. The traveling electric motor 10 and the engine 20 constitute a traveling drive source, and their driving force is transmitted to drive wheels (not shown) of the vehicle via a transmission (not shown).

  Electric power is supplied to the traveling electric motor 10 via an inverter 12 from a motor driving battery 11 that is a power source for driving the motor. The inverter 12 converts the DC voltage of the motor driving battery 11 and the auxiliary battery 13 into an AC voltage. The inverter 12 rotates the traveling electric motor 10 by changing the frequency of the AC voltage according to a control command from a control device 50 described later. The number is controlled.

  In addition, the air conditioner 30 includes an air conditioning case 301 that forms a flow path of air that blows into the vehicle interior, and an air flow upstream side portion of the air conditioning case 301 includes an inside air introduction port 302 that introduces vehicle interior air and an outside of the vehicle interior An outside air inlet 303 for introducing air is formed. These inlets 302 and 303 are selectively opened and closed by an inside / outside air switching door 304. A centrifugal blower 305 that blows air is provided on the downstream side of the air flow of each of the inlets 302 and 303.

  An evaporator 306 for cooling the air blown from the blower 305 is disposed on the air flow downstream side of the blower 305. Here, the evaporator 306 is one of the components of the refrigeration cycle (not shown), and as is well known, from the blown air blown by the blower 305 when the low-pressure refrigerant flowing into the evaporator 306 evaporates. It absorbs heat and cools the blown air. A heater core 307 that heats the air (cold air) that has passed through the evaporator 306 is disposed on the downstream side of the evaporator 306.

  The heater core 307 is a heat exchanger for heating that reheats the air (cold air) that has passed through the evaporator 306 by using engine cooling water as a heat source. In addition, a bypass passage 308 through which the air (cold air) that has passed through the evaporator 306 passes by bypassing the heater core 107 is formed on the side of the heater core 307 inside the air conditioning case 301.

  An air mix door 309 is disposed between the evaporator 306 and the heater core 307. The air mix door 309 is rotatably disposed in the air conditioning case 301 and is driven by a servo motor (not shown) so that its rotational position (opening) can be continuously adjusted. . Therefore, the air volume ratio between the air passing through the heater core 307 and the air passing through the bypass passage 308 is adjusted by the opening degree of the air mix door 309, and the vehicle interior blowing air temperature is adjusted by adjusting the air volume ratio.

  And in the most downstream site | part of the air-conditioning case 301, the face blower outlet 310 for blowing off air-conditioning air to a passenger | crew interior passenger | crew's upper body, the foot blower outlet 311 for blowing air to a passenger | crew passenger's foot, and windshield A defroster outlet 312 for blowing air toward the inner surface of 313 is formed. Air outlet mode switching doors 314 to 316 for controlling the opening and closing of the air outlets 310 to 312 are disposed on the upstream side of the air outlets 310 to 312.

  Next, the engine cooling system 40 will be described. The engine 20 in this embodiment is a water-cooled type, and is a system that cools the cooling water (thermal refrigerant) by the radiator 401. The radiator 401 is a heat exchanger that cools the cooling water that has become a high temperature by exchanging heat with the exhaust heat of the engine 20 by exchanging heat with the outside air.

  The engine 20 and the radiator 401 are connected by a first coolant circuit A that forms a closed circuit between the engine 20 and the radiator 401. The first cooling water circuit A is provided with a first circulation pump 402 that is mechanically driven by the power of the engine 20 and circulates the cooling water through the first cooling water circuit A and the like. The cooling water in the first cooling water circuit A is circulated from the cooling water outlet 21 of the engine 20 to the cooling water inlet 22 of the engine 20 through the radiator 401.

  In the middle of the first cooling water circuit A, a bypass circuit B that bypasses the radiator 401 and distributes the cooling water is connected in parallel to the first cooling water circuit A. Then, the thermostat 403 provided between the first cooling water circuit A and the bypass circuit B performs switching control between the case where the cooling water is circulated through the bypass circuit B and the case where the cooling water is circulated through the radiator 401. . The thermostat 403 is a cooling water temperature responsive valve, and as is well known, the valve body is displaced using the volume change due to the temperature of the thermo wax (temperature sensitive member) to open and close the cooling water passage.

  Further, the first cooling water circuit A is provided with a second cooling water circuit C for circulating the cooling water heated by the engine 20 to the heater core 307. Between the 1st cooling water circuit A and the 2nd cooling water circuit C, the case where a cooling water is distribute | circulated to the 1st cooling water circuit A and the case where a cooling water is distribute | circulated to the 2nd cooling water circuit C are switched. One switching valve 404 is provided.

  A second circulation pump 405 that circulates the cooling water to the heater core 307 is provided between the heater core 307 and the first switching valve 404 in the second cooling water circuit C. In the second cooling water circuit C, a water heating type electric heater 406 is provided as a heating electric heater for heating the cooling water on the downstream side of the refrigerant flow of the second circulation pump 405.

  The water heating type electric heater 406 is a heater for heating the engine cooling water when the engine cooling water temperature is low and the heater core 307 is insufficiently heated. Here, the water heating type electric heater 406 is provided to heat the cooling water which is energized through the motor driving battery 11 and the like and flows through the heater core 307 and the like.

  On the downstream side of the refrigerant flow of the heater core 307 in the second cooling water circuit C, a battery that circulates the cooling water heated by the water heating type electric heater 406 to the heat exchanger 11 a provided adjacent to the motor driving battery 11. A warm-up circuit D is provided. The first and second cooling water circuits A and C, the battery warm-up circuit D, and the bypass circuit B constitute a cooling water circulation circuit.

  Between the 2nd cooling water circuit C and the battery warm-up circuit D, the 2nd switching which switches the case where a cooling water is distribute | circulated to the battery warm-up circuit D, and the case where a cooling water is not distribute | circulated to the battery warm-up circuit D is switched. A valve 407 is provided.

  Here, the battery warm-up circuit D is connected to the second cooling water circuit C on the downstream side of the refrigerant flow of the second switching valve 407, and the second cooling water circuit C is on the downstream side of the refrigerant flow of the first switching valve 404. The first coolant circuit A is connected.

  Further, the hybrid vehicle includes a control device 50. The control device 50 includes a known microcomputer including a CPU, a ROM, a RAM, and the like and peripheral circuits thereof. Based on each output signal from the sensor group, the control device 50 is an electric device of the vehicle, that is, the traveling electric motor 10, the inverter 12, the engine 20, the air conditioner 30, the first and second circulation pumps 402, 405, A control amount is output (control output) to the first and second switching valves 404, 407, and the operation is controlled.

  Sensor detection signals are input from the sensor group to the input side of the control device 50, and operation signals are input from various switches provided on the operation panel (control panel) 15. As the sensor group, first and second cooling water temperature sensors 408 and 409, a battery temperature sensor 11b, an evaporator outlet side temperature sensor 42, an air conditioning sensor 14 and the like are provided.

  Here, the first coolant temperature sensor 408 is a sensor that is provided at the coolant outlet 21 of the engine 20 of the first coolant circuit A and detects the coolant temperature immediately after being discharged from the coolant outlet 21. The second cooling water temperature sensor 409 is a sensor that is provided on the downstream side of the water heating type electric heater 406 of the second cooling water circuit B and detects the temperature of the cooling water heated by the water heating type electric heater 406. . The battery temperature sensor 11b is a sensor that detects the temperature of the battery 11 for driving the motor. The air-conditioning sensor 14 is composed of a sensor such as a temperature sensor for detecting a vehicle interior temperature and a vehicle exterior temperature, and a solar radiation sensor.

  Further, the hybrid vehicle is configured to be able to supply power from the external power source (commercial power source) to the auxiliary battery 13 and the motor drive battery 11 while the vehicle is stopped. Specifically, an external power source connection device (external power source connection means) including an outlet 16 that can be connected to an external power source, a converter 17 and the like is provided.

  As the external power source 100, for example, a commercial power source provided in a garage can be used. When electric power is supplied from an external power source while the vehicle is stopped, electric power is supplied to the electrical equipment via the motor driving battery 11, the inverter 12, and the like.

  Here, when power is supplied from the external power supply 100, the control device 100 is supplied from the external power supply 100 based on the charge state of the motor drive battery 11 and the control signal from the second coolant temperature sensor 409 and the like. The inverter 12 is configured to appropriately distribute the amount of power to the charge amount power of the motor drive battery 11 and the heating power in the water heating type electric heater 406. Note that the control device 50 and the inverter 12 constitute power adjustment means.

  Hereinafter, the operation of the battery warm-up system configured as described above will be described with reference to FIG. FIG. 2 is a flowchart showing the operation of the battery warm-up system. It is assumed that the vehicle is in a stopped state.

  First, it is determined whether or not an external power supply connecting device is connected to the external power supply 100 and power is supplied from the external power supply 100 to the motor drive battery 11 and the auxiliary battery 13 (S100). When it is determined that power is supplied from the external power supply 100, the temperature of the motor drive battery 11 is detected by the battery temperature sensor 11b (S200).

  Then, it is determined whether or not the detected temperature of the motor driving battery 11 is equal to or lower than a predetermined temperature. When it is determined that the temperature of the motor drive battery 11 is equal to or lower than the predetermined temperature, the cooling water flow path of the engine cooling system 40 is switched (S300).

  Specifically, the switching of the cooling water flow path is performed by switching the first switching valve 404 so that the cooling water flows through the second cooling water circuit C, and the second switching valve 407 is switched to the battery warm-up circuit D. It is switched so that the cooling water flows. That is, the first and second switching valves 404 and 407 are controlled so that the engine coolant flows through the heat exchanger 11 a disposed adjacent to the motor driving battery 11.

  After the switching of the first and second switching valves 404 and 407, the water heating type electric heater 406 provided in the second cooling water circuit C is energized from the motor driving battery 11 via the inverter 12 (S500). . The cooling water in the second cooling water circuit C is heated by energizing the water heating type electric heater 406.

  Here, in the inverter 12, the electric power supplied from the external power source 100 is converted into the energization amount (heating power) to the water heating type electric heater 406 and the motor driving battery 11 by the control signal from the control device 50. Appropriate distribution to charging power, etc. Thereby, the electric energy supplied from the limited external power supply 100 can be used effectively.

  Then, the operation of the first and second circulation pumps 402 and 405 is started (S600). By starting the operation of the first and second circulation pumps 402 and 405, the cooling water heated by the water heating type electric heater 406 flows through the battery warm-up circuit D. That is, the cooling water heated by the water heating type electric heater 406 can flow through the heat exchanger 11 a disposed adjacent to the motor driving battery 11 to warm up the motor driving battery 11.

  Here, when power is not supplied from an external power source (S100: NO), and when the motor drive battery 11 reaches a predetermined temperature (S300: NO), the first and second circulation pumps 402, 405 are used. , The energization of the water heating type electric heater 406 is stopped (S700), and the warm-up of the motor drive battery 11 is terminated.

  As described above, the motor driving battery 11 can be warmed up by the heat of the water heating type electric heater 406 for heating the cooling water flowing into the heater core 307 of the air conditioner 30. The motor drive battery 11 can be warmed up without providing the electric heater.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIG. Parts that are the same as or equivalent to those in the first embodiment are given the same reference numerals, and descriptions thereof are omitted. Here, FIG. 3 is a schematic diagram showing a main configuration of the battery warm-up system of the present embodiment.

  In the present embodiment, the water heating type electric heater 406 is not provided in the second cooling water circuit C in order to heat the engine cooling water as in the first embodiment, but the air flow downstream of the heater core 307 in the air conditioning case 301. An air heating type electric heater 307a is arranged on the side as an electric heater for heating.

  The air heating type electric heater 307 a functions as an auxiliary heater for heating the cold air that has passed through the evaporator 306 when the engine coolant temperature is low and the heater core 307 is insufficiently heated.

  Further, a battery outlet 317 is formed on the air flow downstream side of the air heating type electric heater 307 a in the air conditioning case 301. And the blowing mode switching door 318 which controls opening / closing of the battery outlet 317 is provided.

  The battery outlet 317 is formed so as to blow out air toward the motor drive battery 11 via the blowout duct 319.

  As an operation of the present embodiment, when the temperature of the motor driving battery 11 supplied from the external power source 100 and detected by the battery temperature sensor 11b is lower than a predetermined temperature, the blowing mode switching door 318 causes a battery outlet. 317 is opened.

  The air heating type electric heater 307a is energized from the motor driving battery 11 via the inverter 12, and the blower 305 is operated. The blown air from the blower 305 is heated by the air heating type electric heater 307a through the evaporator 306 and the heater core 307, and blown out from the battery outlet 317 toward the motor drive battery 11. The motor driving battery 11 is warmed up by the air heated by the air heating type electric heater 307a. Here, the opening degree of the air mix door 309 is controlled to the maximum heating position (solid line position in the figure).

  As described above, the motor driving battery 11 can be warmed up by the heat of the air heating type electric heater 307a provided on the downstream side of the air flow of the heater core 307 of the air conditioner 30. The battery 11 for driving the motor can be warmed up without providing.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be variously modified as follows.

  (1) In the above-described embodiment, the battery warm-up system for warming up the motor drive battery 11 mounted on the hybrid vehicle has been described. However, the present invention may be applied to an electric vehicle having only the traveling electric motor 10. In this case, in the first embodiment, a water heating type electric heater may be provided in the cooling water circuit of the inverter 12 and the traveling electric motor 10 instead of the engine cooling water circuit.

  (2) In the above-described embodiment, whether or not to warm up the motor drive battery 11 is determined based on the temperature of the motor drive battery 11 detected by the battery temperature sensor 11b. It is not limited. For example, it may be determined whether or not to warm up the motor drive battery 11 based on the outside temperature of the passenger compartment or the engine coolant temperature.

  (3) In the above-described embodiment, the example in which the motor drive battery 11 is warmed up by the heat of the water heating electric heater 406 and the air heating electric heater 307a for air conditioning in the vehicle interior has been described. It is not limited to the electric heater for heating. For example, the motor drive battery 11 may be warmed up by heat from a seat heater provided on the surface of the seat on which the occupant sits or a radiant electric heater that warms the lower half of the occupant.

  (4) In the above-described embodiment, when power is supplied from an external power source while the vehicle is stopped, power is supplied to an electrical device such as an electric heater for heating via the motor drive battery 11 or the like. However, the present invention is not limited to this. For example, electric power from an external power supply may be supplied directly to the inverter 12 from the converter 17 (external power supply connection device) without passing through the motor drive battery 11.

  (5) In the second embodiment described above, the air heated by the air heating type electric heater 307 a is directly blown out from the battery outlet 317 toward the motor drive battery 11, but is rectified to the outlet duct 319. A plate or the like may be provided and blown out to the motor drive battery 11 in a state where the air heated by the air heating type electric heater 307a is rectified.

It is a mimetic diagram showing the whole battery warm-up system composition concerning a 1st embodiment. It is a flowchart which shows the action | operation of the battery warming-up system which concerns on 1st Embodiment. It is a schematic diagram which shows schematic structure of the battery warming-up system which concerns on 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Electric motor for driving | running | working 11 Battery for motor drive 16 External power supply connection means 100 External power supply 307a Air heating type electric heater 406 Water heating type electric heater

Claims (2)

A traveling electric motor (10) for traveling the vehicle;
An engine (20) for running the vehicle;
An external power supply connection means (16) capable of charging the motor drive battery (11) by connection to an external power supply (100) while the vehicle is stopped;
An air conditioning case (301 ) that forms an air passage, which is disposed in the air conditioning case (301), for heating air that is blown into the vehicle interior by engine cooling water heated by exhaust heat of the engine (20) An air conditioner (30) configured to include a circulation circuit for circulating the engine coolant in the heat exchanger (307 ), the heating heat exchanger (307), and
An electric heater for heating (406) provided in the circulation circuit and generating heat by energization to heat the engine coolant ;
A heat exchanger (11a) provided in the circulation circuit and provided adjacent to the motor drive battery (11);
A switching valve (404, 407) for switching the flow path of the engine cooling water in the circulation circuit ,
When the temperature of the motor drive battery (11) becomes a predetermined temperature or lower while the motor drive battery (11) is being charged by the external power supply connection means (16) while the vehicle is stopped. The heating electric heater (406) is energized, and the switching valve (404, 407) is connected to the engine (20) → the heating electric heater (406) → the heating heat exchanger (307). The battery warm-up system is characterized in that the flow path of the engine cooling water in the circulation circuit is switched so that the engine cooling water flows from the heat exchanger (11a) to the engine (20) . Electric power adjusting means (12) for controlling the amount of electric power supplied from the external power source (100) to the heating electric heater ( 4.06);
The power adjusting means (12) uses at least the electric power supplied from the external power source (100) for heating the electric power for charging the battery for driving the motor (11) and the electric heater for heating ( 406). The battery warm-up system according to claim 1, wherein the battery warm-up system is allocated to electric power.

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