JP4412303B2 - Vehicle warming device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To promote warming of a vehicle by efficiently using regeneration power. <P>SOLUTION: The device comprises a refrigerant cycle 26 for compressing refrigerant by an electric compressor 28 and heating cooling water by a water-refrigerant heat exchanger 20, and a battery cooling water cycle 36 for circulating the cooling water heated by the exchanger 20 to warm a battery 42. A control unit 46 controls, when the temperature of the battery 42 detected by a temperature sensor 48 is a temperature at which the battery cannot be activated or is not chargeable, a charging control selector 46 to supply regeneration power generated in a motor generator 14 to the electric compressor 28 and to supply the power to an electric water pump 38 for warming the battery 42. <P>COPYRIGHT: (C)2008,JPO&amp;INPIT

Description

  The present invention relates to a vehicle warming device, and more particularly to a vehicle warming device that warms an engine by a heat pump that heats cooling water.

  As a technique for increasing the temperature of engine cooling water by providing a heat pump for heating the cooling water, a technique described in Patent Document 1 has been proposed.

In the technique described in Patent Literature 1, the vehicle interior is air-conditioned using both the exhaust heat of the engine cooling water and the exhaust heat of the engine, and the heat exhausted from the engine is effectively used. In the technique described in Patent Document 1, the engine cooling water can be warmed by the heat pump and the exhaust heat recovery device, and the engine cooling water can be raised to a sufficient temperature to be warmed up. In addition, powerful heating can be performed by warming the engine coolant with a heat pump and an exhaust heat recovery device.
JP 2002-59736 A

  On the other hand, in a hybrid vehicle equipped with an engine and a motor, when the battery is at a low temperature (such as during cold start), the active state of the battery is low and charging efficiency is reduced, so charging may be restricted to suppress charging. . In this case, the hybrid vehicle charges the battery with regenerative energy by causing the motor to function as a generator at the time of braking. However, since charging is limited, charging cannot be performed and energy use efficiency is reduced.

  The present invention has been made in view of the above-described facts, and an object thereof is to promote warm-up of a vehicle by efficiently using regenerative power.

In order to achieve the above object, the invention according to claim 1 is directed to a heat pump that heats engine cooling water supplied to the engine according to the supplied power, and a temperature of a battery that stores regenerative power generated in the vehicle. If the temperature of the battery detected by the detection means for detecting is equal to or higher than the predetermined temperature, together with the regenerative electric power is controlled so as to be accumulated in the battery, the temperature of the battery detected by the detection means Control means for limiting charging of the battery and controlling the regenerative power to be supplied to the heat pump when the temperature is lower than a predetermined temperature .

  According to the first aspect of the present invention, in the heat pump, the engine coolant is heated according to the supplied electric power. For example, the heat pump can compress the refrigerant with a compressor and heat the engine coolant using the compressed refrigerant.

Further, regenerative power generated by the motor generator during braking of a vehicle such as a hybrid vehicle is stored in the battery by the control means. However, for example, batteries than etc. If a low temperature such as not to active the charging efficiency decreases.

Therefore, the control means controls the regenerative power to be stored in the battery and detected by the detection means when the battery temperature detected by the detection means for detecting the battery temperature is equal to or higher than a predetermined temperature. When the temperature of the battery is lower than the predetermined temperature, the charging of the battery is limited and regenerative power is controlled to be supplied to the heat pump. That is, since in the case when the cold battery is not in the active state is limited charging, but regenerative power is excessive, the excess regenerative electric power is supplied to the heat pump, the cooling water which the heat pump is actuated by it Since the engine can be heated, engine warm-up can be promoted. Therefore, the warm-up of the vehicle can be promoted by efficiently using the regenerative power.

The present invention further includes a warming means for warming up the battery according to the supplied power, as in the invention described in claim 2, wherein the control means detects the temperature of the battery detected by the detecting means. May be further controlled so that regenerative power is also supplied to the warming means when charging is limited below a predetermined temperature . That is, the battery is the battery charge limit to the lower temperatures if such so as not to active state is performed, when this, by further control such regenerative power to warm means is supplied, the battery is warm Thus, the battery charge restriction can be released early, and regenerative power can be charged into the battery early.

  Further, in the present invention, the heat pump may further warm up the battery as in the third aspect of the present invention. For example, when the temperature is low so that the battery does not become active or when the battery is fully charged, charging of the battery is restricted, but by warming up the battery with a heat pump, the battery is warmed and charged. The restriction can be released early and the battery can be charged with regenerative power early.

The invention according to claim 4, according to the supplied power, and a heat pump for heating the battery, the temperature of the battery detected by the detection means for detecting the temperature of the batteries for storing electric regenerative power generated in the vehicle Is controlled so that the regenerative power is stored in the battery when the temperature is equal to or higher than a predetermined temperature , and the charging of the battery is restricted when the temperature of the battery detected by the detection means is lower than the predetermined temperature. And control means for controlling the regenerative power to be supplied to the heat pump.

  According to invention of Claim 4, a battery is heated in a heat pump. For example, the heat pump compresses the refrigerant with a compressor and heats the battery using the compressed refrigerant, or heats the cooling water with the heat pump and heats the battery with the heated cooling water. May be.

Further, regenerative power generated by the motor generator during braking of a vehicle such as a hybrid vehicle is stored in the battery by the control means. However, for example, batteries than etc. If a low temperature such as not to active the charging efficiency decreases.

Therefore, the control means is controlled so that the regenerative power is stored in the battery and detected by the detection means when the battery temperature detected by the detection means for detecting the battery temperature is equal to or higher than a predetermined temperature. When the temperature of the battery is lower than the predetermined temperature, the charging of the battery is limited and regenerative power is controlled to be supplied to the heat pump. That is, since if the battery is not in the active state when the cold is charged limited, but regenerative power is excessive, the excess regenerative electric power is supplied to the heat pump, thereby heating the heat pump is operated battery As a result, the battery can be warmed up, and the battery charge limit can be released early and the battery can be activated. Accordingly, the regenerative power can be efficiently used to promote the warming up of the vehicle.
The control means includes a charge control selector for controlling the supply destination of the electric power generated by the motor generator as in the invention described in claim 5, and the battery temperature detected by the detection means is equal to or higher than a predetermined temperature. In addition, the electric power generated by the motor generator is supplied to the battery, and when the temperature of the battery detected by the detecting means is lower than the predetermined temperature, the charge control selector is controlled so that the electric power generated by the motor generator is supplied to the heat pump. In the case where the warming means is provided, the charging control selector for controlling the supply destination of the electric power generated by the motor generator is included and detected by the detecting means. If the battery temperature is higher than the specified temperature, the power generated by the motor generator is supplied to the battery. If the temperature of the battery detected by the detection means is lower than a predetermined temperature, the electric power generated by the motor generator to supply at least one of the heat pump and hot air means, may control the charge control selector.

  As described above, according to the present invention, when a battery that stores regenerative power is limited in charging, the heat pump is operated with regenerative power by controlling surplus regenerative power to be supplied to the heat pump. Thus, the engine cooling water and the battery can be heated, so that there is an effect that the regenerative power can be efficiently used to promote the warm-up of the vehicle.

  Hereinafter, an example of an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a block diagram showing a configuration of a vehicle warming device according to an embodiment of the present invention. The vehicle warming device 10 according to the present embodiment will be described as being mounted on a hybrid vehicle equipped with an engine 12 and a motor generator 14 as a driving source for traveling.

  As shown in FIG. 1, the vehicle warming device 10 according to the embodiment of the present invention warms up a cooling water cycle 16 for cooling the engine 12 with cooling water, a refrigerant cycle 26 of the vehicle air conditioning device, and a battery 42. A battery cooling water cycle 36 is provided.

  An exhaust heat recovery unit 18, a water / refrigerant heat exchanger 20, a water pump 22, and a heater core 24 are provided in a cooling water cycle 16 that cools the engine 12 with cooling water. The cooling water is cooled by the water pump 22. Water is circulated. The water pump 22 is electrically driven so that the cooling water can be circulated even when the engine 12 is stopped.

  The exhaust heat recovery unit 18 is provided in an exhaust pipe that discharges engine exhaust gas, converts heat into electric power, and is cooled by cooling water in the cooling water cycle 16. That is, heat can be exchanged between the exhaust pipe and the cooling water, and the temperature of the cooling water can be raised by the heat of the exhaust pipe.

  The water-refrigerant heat exchanger 20 functions as a so-called heat pump that raises the temperature of the cooling water of the engine 12 using the refrigerant cycle 26 of the vehicle air conditioner.

  The heater core 24 functions as a heat source when the vehicle interior is heated by a vehicle air conditioner that air-conditions the vehicle interior. That is, the cooling water heated by the heat radiation from the engine 12 is radiated by the heater core 24 so that the vehicle interior can be heated.

  The refrigerant cycle 26 of the vehicle air conditioner includes an electric compressor 28, a water refrigerant heat exchanger 20, a condenser 30, an expansion valve 32, and an evaporator 34. The refrigerant cycle 26 uses the water refrigerant heat exchanger 20 as a heat pump. It is also possible to function. The evaporator 34 has a bypass passage for causing the water-refrigerant heat exchanger 20 to function as a heat pump, and bypasses the refrigerant without passing through the evaporator 34 when functioning as a heat pump.

  When the vehicle air conditioner functions as a cooling system, the refrigerant cycle 26 compresses the refrigerant by the electric compressor 28 to obtain a high-temperature and high-pressure vaporized refrigerant. The refrigerant that has been liquefied by the expansion valve 32 is rapidly depressurized to be atomized and vaporized by the evaporator 34, thereby cooling the air that passes through the evaporator 34. At this time, the evaporator 34 cools the passing air so as to condense moisture in the air, whereby the air after the evaporator 34 is dehumidified.

  In addition, when the water refrigerant heat exchanger 20 functions as a heat pump, the refrigerant cycle 26 compresses the refrigerant by the compressor 28 to obtain a high-temperature and high-pressure vaporized refrigerant, and the heat of the refrigerant is converted into the water refrigerant heat exchanger 20. The cooling water is heated by dissipating heat to the cooling water of the cooling water cycle 16 that passes through. Further, the refrigerant liquefied after passing through the water refrigerant heat exchanger 20 is decompressed by an expansion valve (not shown) (for example, incorporated in the water refrigerant heat exchanger 20) and absorbed by the capacitor 30, bypassing the evaporator 34. A refrigerant is supplied to the electric compressor 28. By repeating this cycle, the water-refrigerant heat exchanger 20 functions as a heat pump.

  Further, the battery coolant cycle 36 is provided with an electric water pump 38, a water refrigerant heat exchanger 20, and a battery heater core 40, and the coolant is circulated by the electric water pump 38. Further, the cooling water is heated by the water refrigerant heat exchanger 20, and the heat of the cooling water is radiated by the battery heater core 40. Thereby, the battery 42 provided in the vicinity of the battery heater core 40 is heated and the battery 42 can be warmed up. The heat of the battery heater core 40 may be blown to the battery 42 using a fan or the like.

  By the way, since the vehicle warming device 10 according to the present embodiment is mounted on a hybrid vehicle, traveling by driving the engine 12 and traveling by driving the motor generator 14 are performed. During braking, the motor generator 14 functions as a power generator to generate electric power and obtain regenerative power, and the battery 42 can be charged by the regenerative power.

  However, in this embodiment, the regenerative power cannot be charged to the battery 42 when the temperature is low such that the battery is not activated, when the battery is fully charged, or when the battery is high temperature. Is used as electric power for warming up the battery or the engine cooling water, and the supply destination of the regenerative electric power is controlled by the control unit 44.

  The motor generator 14 is connected to the battery 42 via the charge control selector 46, and the regenerative power generated by the motor generator 14 is input to the charge control selector 46, and when the battery 42 can be charged, the battery 42 Charged.

  Charging from the motor generator 14 to the battery 42 is performed by the charge limiting circuit 15, for example, when the battery 42 is lower than a predetermined temperature (a temperature at which the battery is not activated) When the battery 42 is in a fully charged state, a charge restriction instruction for the battery 42 is output to the charge control selector 46 to restrict the charge to the battery 42.

  In addition, an electric compressor 28 and an electric water pump 38 are connected to the charge control selector 46, and regenerative power generated by the motor generator 14 in response to an instruction from the control unit 44 is supplied to the electric compressor 28 and the electric water pump 38. It is possible.

  On the other hand, a temperature sensor 48 for detecting the temperature of the battery 42 and a charge control selector 46 are connected to the control unit 44, and a charge restriction state for the battery 42 by the charge restriction circuit 15 is input and the battery temperature is controlled. The detection result is input, and the charging control selector 46 is controlled based on the charging limit state and the detection result of the temperature sensor 48 to control the regenerative power supply destination from the motor generator 14.

  Next, the operation of the vehicle warming device 10 according to the embodiment of the present invention configured as described above will be described. FIG. 2 is a flowchart showing an example of the flow of processing performed by the control unit 44 of the vehicle warming device 10 according to the embodiment of the present invention.

  First, when an ignition switch (not shown) or the like is turned on, in step 100, the temperature of the battery 42 is detected by the temperature sensor 48, and the process proceeds to step 102.

  In step 102, it is determined whether or not the temperature of the battery 42 detected by the temperature sensor 48 is the charge limit temperature. The determination determines whether or not the temperature is equal to or lower than a predetermined temperature depending on whether or not the battery 42 is in an active state. If the determination is negative, that is, the temperature is not limited by the charge limiting circuit 15. In that case, the process returns to step 100 and the above-described processing is repeated.

  If the determination in step 102 is affirmative, that is, if the battery 42 is not in an active state and has a temperature at which charging is limited by the charge limiting circuit 15, the routine proceeds to step 104.

  In step 104, the state of charge of the battery 42 is detected, and the routine proceeds to step 106. That is, it is detected whether or not the charge state of the battery 42 is restricted by the charge restriction circuit 15.

  In step 106, it is determined whether or not the battery 42 is charged. That is, it is determined whether or not charging is restricted from the state of charge of the battery 42 detected in step 104. If the determination is negative, charging restriction to the battery 42 is not performed by the charging restriction circuit 15. Returning to step 100, the above-described processing is repeated.

  If the determination at step 106 is affirmative, the charging restriction circuit 15 restricts the charging of the battery 42, and the routine proceeds to step 108.

  In step 108, it is determined whether there is surplus regenerative power. In this determination, it is determined whether or not the regenerative power generated by the motor generator 14 is input to the charge control selector 46, and if the determination is negative, the process returns to step 100 and the above-described processing is performed. Is repeated.

  If the determination in step 108 is affirmative, that is, if there is surplus regenerative power, the process proceeds to step 110 to determine whether or not the electric compressor 28 is on, and the determination is denied. If yes, then go to Step 112; if yes, go to Step 114.

  In step 112, the electric compressor 28 is turned on with regenerative power, and the routine proceeds to step 114. That is, the charge control selector 46 is controlled so that regenerative power is supplied to the electric compressor 28, and the electric compressor 28 is turned on by the regenerative power. When the electric compressor 28 is turned on, the water refrigerant heat exchanger 20 of the refrigerant cycle 26 functions as a heat pump, and the cooling water of the engine 12 is warmed by the water refrigerant heat exchanger 20 to warm up the engine cooling water. .

  Next, in step 114, it is determined whether or not the electric water pump (W / P) 38 is turned on. If the determination is affirmative, the process returns to step 100 and the above processing is repeated and negative. If so, the process proceeds to step 116.

  In step 116, the electric water pump 38 is turned on with regenerative power, and the process returns to step 100 and the above-described processing is repeated. That is, the charge control selector 46 is controlled so that regenerative power is supplied to the electric water pump 38, and the electric water pump 38 is turned on by the regenerative power. Thereby, the cooling water of the battery cooling water cycle 36 is circulated by the electric water pump 38, and the cooling water of the battery cooling water cycle 36 is warmed by the water refrigerant heat exchanger 20. Then, the warmed cooling water is radiated by the battery heater core 40, and the battery is warmed by the radiated heat of the battery heater core 40, so that the charging limitation of the battery 42 can be released early.

  As described above, in the vehicle warming device 10 according to the embodiment of the present invention, the regenerative electric power generated by the motor generator 14 becomes redundant when the charging of the battery 42 is limited such as when it is cold. Since the surplus regenerative electric power can be used to warm up the cooling water of the engine 12 and the battery 42, it is possible to promote warm air such as when cold. Moreover, since warm air is promoted using surplus regenerative power, energy utilization efficiency can be improved.

  Further, warming of the engine 12 is promoted, the battery 42 can be warmed by the warmed cooling water, the charging limit of the battery 42 can be released early, and the regenerative power is charged to the battery 42 early. Is possible.

  In the above embodiment, the case of performing both warming of the cooling water and warming of the battery has been described as an example. However, the present invention is not limited to this, and only one of them may be warmed up. . For example, the battery cooling water cycle 36 may be omitted, and the electric compressor 28 may be driven with regenerative power to warm only the cooling water, or the cooling water cycle 16 may be heated by the water refrigerant heat exchanger 20. It is good also as a structure which warms up only the battery 42 using directly the heat radiation of the water-refrigerant heat exchanger 20, without performing.

  Further, in the above embodiment, the cooling cycle 16 and the battery cooling water cycle 36 are heated by the water refrigerant heat exchanger 20, but the battery cooling water cycle 36 is omitted and the water refrigerant heat exchanger 20 is omitted. Alternatively, the cooling water cycle 16 and the battery 42 may be heated as a configuration in which the battery 42 is heated by directly using the heat radiation.

  Moreover, in said embodiment, although it was set as the structure which functions the water refrigerant | coolant heat exchanger 20 of the refrigerant cycle 26 as a heat pump, it is not restricted to this, Various heat pumps can be applied. At this time, at least one of the engine coolant and the battery 42 can be a target to be heated by a heat pump.

It is a block diagram which shows the structure of the warming device for vehicles concerning embodiment of this invention. It is a flowchart which shows an example of the flow of the process performed with the control unit of the warming device for vehicles concerning embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vehicle warming device 12 Engine 14 Motor generator 15 Charge limiting circuit 16 Cooling water cycle 20 Water refrigerant heat exchanger 26 Refrigerant cycle 28 Electric compressor 36 Battery cooling water cycle 38 Electric water pump 40 Battery heater core 42 Battery 44 Control unit 46 Charge control selector 48 Temperature sensor

Claims (6)

A heat pump for heating the engine coolant supplied to the engine according to the supplied power;
When the temperature of the battery detected by the detecting means for detecting the temperature of the battery that stores regenerative power generated in the vehicle is equal to or higher than a predetermined temperature, the regenerative power is controlled to be stored in the battery , Control means for limiting charging of the battery and controlling the regenerative power to be supplied to the heat pump when the temperature of the battery detected by the detection means is lower than a predetermined temperature ;
Vehicle warming device including. Further comprising a warming means for warming up the battery according to the supplied power,
2. The control unit further controls the regenerative power to be supplied to the warming unit when the temperature of the battery detected by the detection unit is less than a predetermined temperature and charging is limited. The vehicle warming device described in 1.   The vehicle warming device according to claim 1, wherein the heat pump further warms up the battery. A heat pump that heats the battery according to the supplied power;
When the temperature of the battery detected by the detecting means for detecting the temperature of the battery that stores regenerative power generated in the vehicle is equal to or higher than a predetermined temperature, the regenerative power is controlled to be stored in the battery , Control means for limiting charging of the battery and controlling the regenerative power to be supplied to the heat pump when the temperature of the battery detected by the detection means is lower than a predetermined temperature ;
Vehicle warming device including. The control means includes a charge control selector for controlling a supply destination of power generated by the motor generator, and the power generated by the motor generator is detected when the temperature of the battery detected by the detection means is equal to or higher than a predetermined temperature. The charge control selector is controlled to supply power generated by a motor generator to the heat pump when the temperature of the battery detected by the detection means is lower than a predetermined temperature. The vehicle warming device according to any one of 4. The control means includes a charge control selector for controlling a supply destination of power generated by the motor generator, and the power generated by the motor generator is detected when the temperature of the battery detected by the detection means is equal to or higher than a predetermined temperature. The charge control selector is configured to supply power generated by a motor generator to at least one of the heat pump and the warming means when the temperature of the battery detected by the detection means is less than a predetermined temperature. The vehicle warming device according to claim 2, wherein the vehicle warming device is controlled.

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