JP3112042B2 - Electric vehicle heating system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating apparatus for an electric vehicle in which heated hot water is used as a heat source for heating when riding.

[0002]

2. Description of the Related Art Conventionally, in an electric vehicle which does not have engine cooling water, such as an electric vehicle, a vehicle interior is heated using a heat pump.

[0003]

However, in an electric vehicle in which the interior of a vehicle is heated by a heat pump, the power supply on the vehicle is greatly consumed to operate the heat pump. In addition, since the vehicle-mounted power supply supplies electric power to the traveling motor of the electric vehicle, there is a problem that the traveling distance of the electric vehicle is reduced. In addition, since the heat pump has a poor start-up at a low temperature, there is a problem that the passenger compartment cannot be heated immediately after getting on the vehicle. SUMMARY OF THE INVENTION It is an object of the present invention to provide a heating device for an electric vehicle, which prevents a decrease in traveling distance and hastens heating of a vehicle compartment.

[0004]

SUMMARY OF THE INVENTION The present invention provides a hot water heater for heating a vehicle interior by exchanging heat between hot water and air, a hot water circuit for circulating hot water through the hot water heater, and a hot water circuit for the hot water circuit. And a heat insulation tank for keeping warm water flowing into the inside, a first heating means for heating the hot water in the heat insulation tank when electric power is supplied from an external power supply, and an electric power supply from a vehicle-mounted power supply. Technical means comprising a second heating means for heating the hot water in the hot water circulation path by waste heat of the operating electric parts is employed.

[0005]

According to the present invention, when electric power is supplied from the external power supply to the first heating means while the vehicle-mounted power supply is being charged, the hot water in the heat retaining tank is heated. Then, when the electric vehicle is boarded, the warm water in the heat retaining tank heated by the first heating means is caused to flow into the hot water type heater, so that the heating of the vehicle interior is quickly started.
In addition, when electric power is supplied from an in-vehicle power supply to an electric component when the electric vehicle is riding, the electric component generates heat when consuming electric energy. The second heating means heats the hot water in the hot water circulation path by the waste heat of the electric components and circulates the hot water in the hot water type heater, thereby heating the vehicle interior while suppressing the consumption of the onboard power supply. Therefore, the traveling distance of the electric vehicle becomes longer.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an electric vehicle heating apparatus according to the present invention will be described with reference to an embodiment shown in FIGS. FIG.
FIG. 2 is a diagram showing a hot water type heating device, FIG. 2 is a diagram showing an accumulator type refrigeration cycle, and FIG. 3 is a diagram showing an electric vehicle. The electric vehicle 1 includes a battery 4 serving as a vehicle-mounted power supply that is charged by a charger 3 serving as an external power supply via a junction box 2, an inverter 5 serving as an electric component supplied with power from the battery 4 via the junction box 2, A drive motor 6 as an electric component whose frequency is changed by converting the frequency by the inverter 5, a transmission 7 driven by the drive motor 6, this transmission 7
A differential mechanism 9 connected to the output shaft 8 is mounted.

The electric vehicle 1 is equipped with an air conditioner 10 for air-conditioning the interior of the vehicle. The air conditioner 10 includes a blower duct 11 for sending air into a vehicle compartment, a blower 12 for generating an airflow toward the vehicle compartment in the blower duct 11, and an accumulator-type switchable refrigerant flow direction. The air conditioner includes a refrigeration cycle 13, a hot water type heating device 14 for heating the passenger compartment, and a control circuit 15 for controlling the air conditioner 10. Inside air (vehicle interior air) introduced from the inside air inlet 16 inside the ventilation duct 11.
Or the outside air introduced from the outside air inlet 17 (air outside the vehicle compartment)
An air passage 21 is formed to send the air to the differential outlet 18, the vent outlet 19, or the foot outlet 20. The blower 12 is disposed on the windward side of the air flow path 21 and is driven to rotate by a blower motor 22. The blower motor 22
When power is supplied from the battery 4 mounted on the electric vehicle, the blower 12 is rotated at a predetermined rotation speed.

The refrigeration cycle 13 is a so-called heat pump, and includes a refrigerant compressor 23, a first indoor heat exchanger 24,
Decompression device 25, second indoor heat exchanger 26, outdoor heat exchanger 2
7 and the accumulator 28 and the like. The refrigeration cycle 13 includes a four-way valve 29 and check valves 30 to 3.
The flow direction of the refrigerant in the refrigeration cycle 13 is switched between a heating operation and a cooling operation by the solenoid valve 3 and the solenoid valve 34. The refrigerant compressor 23 is housed in a housing 38. The refrigerant compressor 23 is rotationally driven by an electric motor 35 mounted in a housing 38, compresses the refrigerant gas sucked into the inside from the suction side, and discharges the high-temperature and high-pressure refrigerant gas from the discharge side. When electric power is supplied from the battery 4, the electric motor 35 drives the refrigerant compressor 23 at a predetermined rotation speed.

The first indoor heat exchanger 24 is disposed in the air flow path 21 on the lee side of a hot water heater 41 described later, and is connected between the pressure reducing device 25 and the check valves 30 and 31. The first indoor heat exchanger 24 functions as a refrigerant condenser that exchanges heat between a high-temperature refrigerant gas and air flowing through the air flow path 21 during heating operation to heat the air and condense the refrigerant. In addition, the first indoor heat exchanger 24 exchanges heat between the high-temperature liquid refrigerant condensed in the outdoor heat exchanger 27 and the air flowing in the air flow path 21 during the cooling operation, thereby heating the air and condensing the refrigerant. Works as a refrigerant condenser. Decompression device 25
Is connected between the first and second indoor heat exchangers 24 and 26, for example, using a fixed throttle such as a capillary tube. The second indoor heat exchanger 26 includes the first indoor heat exchanger 24
And is connected between the pressure reducing device 25 and the check valves 32 and 33. The second indoor heat exchanger 26 is a refrigerant evaporator that exchanges heat between a low-temperature and low-pressure mist refrigerant and air flowing through the air flow path 21 to cool the air and evaporate the refrigerant during the heating operation and the cooling operation. Work as

The outdoor heat exchanger 27 is disposed outside the vehicle compartment and is connected between the four-way valve 29 and the check valves 31, 33.
The outdoor heat exchanger 27 functions as a refrigerant evaporator that heats the refrigerant by exchanging heat between the low-pressure refrigerant gas evaporated in the second indoor heat exchanger 26 and the outside air blown by the electric fan 36 during the heating operation. The outdoor heat exchanger 27 functions as a refrigerant condenser that exchanges heat between the high-temperature and high-pressure refrigerant gas and the outside air blown by the electric fan 36 during the cooling operation to condense the refrigerant. The accumulator 28 is connected between the suction side of the refrigerant compressor 23 and the four-way valve 29, separates the refrigerant flowing from the four-way valve 29 into a liquid refrigerant and a refrigerant gas, and separates only refrigerant gas into the suction side of the refrigerant compressor 23. To supply. The solenoid valve 34 is disposed in a bypass pipe 37 connected in parallel to the second indoor heat exchanger 26, opens when energized, and bypasses the refrigerant when dehumidification by the second indoor heat exchanger 26 is unnecessary. Let it.

The hot water heating device 14 includes a hot water heater 4.
1, hot water circulation path 42, electric heater 43, first and second waste heat recovery units 44 and 45, outdoor heat exchanger 46, circulation pump 4
7, 48, three-way valves 49 and 50, solenoid valves 51 and 52, and the like. The hot water heater 41 is disposed in the air passage 21 on the windward side of the first indoor heat exchanger 24 in order to effectively recover heat energy to a low temperature, and the three-way valve 4
9 and 50 are connected. This hot water heater 41
Heats the air by exchanging heat between warm water (antifreeze) flowing inside and air flowing through the air flow path 21. On the windward side of the hot water heater 41, the amount of air passing through the first indoor heat exchanger 24 and the hot water heater 41 and the amount of air bypassing the first indoor heat exchanger 24 and the hot water heater 41 are adjusted. An air mix door 39 for adjusting the temperature of the air blown into the vehicle interior is rotatably mounted. The warm water circulation path 42 is provided with a heat retaining tank 54 that is covered with a heat insulating material 53 that insulates the inside and the outside and keeps warm water flowing into the inside. As the heat insulating material 53, a foam material, a vacuum bottle, or the like is used. The hot water circulation path 42 is
4. The three-way valve 49, the hot water heater 41, the three-way valve 50, the first and second waste heat recovery units 44 and 45, and the circulation pump 47 are connected in a ring shape to circulate hot water through the hot water heater 41. The hot water circulation path 42 includes a bypass 55 that bypasses the hot water heater 41, a bypass 56 that bypasses the first and second waste heat recovery units 44 and 45, and a hot water that passes through the outdoor heat exchanger 46. The cooling path 57 and a bypass path 58 that bypasses the outdoor heat exchanger 46 are connected.

The electric heater 43 is the first heating means of the present invention, and is provided in
When the battery is charged, the hot water in the heat retaining tank 54 is heated by the electric power from the charger 3, and for example, a nichrome wire heater is used. The first waste heat recovery device 44 is the second heating means of the present invention, and is disposed outside the vehicle compartment and connected between the three-way valve 50 and the second waste heat recovery device 45. This first waste heat recovery unit 4
4 collects waste heat generated by the operation of the drive motor 6 of the electric vehicle 1 and heats the hot water by the waste heat.
The second waste heat recovery device 45 is the second heating means of the present invention, and is disposed outside the vehicle compartment and connected between the first waste heat recovery device 44 and the circulation pump 47. This second waste heat recovery unit 45
Recovers waste heat generated by the operation of the inverter 5,
The hot water is heated by the waste heat. Outdoor heat exchanger 46
Is installed in a place that is easily affected by the wind of the electric vehicle 1,
The hot water is cooled by exchanging heat between the high-temperature hot water and the outside air blown by the electric fan 59.

The circulation pump 47 is driven to rotate by an electric motor 60, is connected between the second waste heat recovery unit 45 and the heat retaining tank 54, and circulates hot water when power is supplied from the battery 4. The circulation pump 48 is driven to rotate by an electric motor 61, is connected between the three-way valve 50 and the heat retaining tank 54, and circulates hot water when power is supplied from the battery 4. When electric power is supplied from the battery 4, the electric motors 60 and 61 drive the circulation pumps 47 and 48 at a predetermined rotation speed. The three-way valve 49 is a switching means of the present invention, and when the electromagnetic coil 62 is energized, the hot water heater 41 and the warm tank 5
4 and is set to a second position connecting the heat retaining tank 54 and the bypass 55 when the energization of the electromagnetic coil 62 is stopped. The three-way valve 50 is a switching unit of the present invention, and is set at a first position connecting the hot water heater 41 and the first and second waste heat recovery units 44 and 45 when the electromagnetic coil 63 is energized, When the energization of the electromagnetic coil 63 is stopped, the electromagnetic coil 63 is set at the second position where the bypass path 56 and the hot water heater 41 are connected.

The three-way valve 49 is set at the first position,
When the three-way valve 50 is set to the second position, a first hot water circuit in which hot water circulates through the heat retaining tank 54 → the hot water type heater 41 → the circulation pump 48 → the heat retaining tank 54 is formed. Also, the three-way valve 49
When the three-way valve 50 is set to the first position and the three-way valve 50 is set to the first position, the heat retention tank 54 → the hot water heater 41 → the first waste heat recovery unit 44 → the second waste heat recovery unit 45 → the circulation pump 47 → A second hot water circuit in which hot water circulates in the heat retaining tank 54 is formed. Further, when the three-way valve 49 is set to the second position, the heat insulation tank 54
→ A bypass path 55 → a first waste heat recovery unit 44 → a second waste heat recovery unit 45 → a circulation pump 47 → a third hot water circuit (heat storage circuit) in which hot water circulates through the heat retaining tank 54 is formed. Solenoid valve 51
When the power is supplied, the valve opens to supply hot water to the hot water cooling path 57, and when the power supply is stopped, closes the valve to supply hot water to the bypass path 58. Note that a thermostat (temperature-sensitive valve) may be used instead of the electromagnetic valve 51. The electromagnetic valve 52 opens when energized and partially supplies hot water to the heat retaining tank 54, and closes when energization is stopped to supply hot water only to the bypass 58.

The control circuit 15 is based on electric signals from the control computer 70 of the electric vehicle 1, the control panel 71 of the air conditioner 10, and the temperature sensors 72, 73, based on the blower motor 22, the solenoid valves 34, 51, 52, It controls the energization (hereinafter, referred to as ON) and the stop of the energization (hereinafter, referred to as OFF) of the electric motors 35, 60, 61, the electric fans 36, 59, the electric heater 43, and the electromagnetic coils 62, 63. The control computer 70 sends a charge signal to the control circuit 15 when the battery 4 is charged, and sends the charge signal to the control circuit 15 when an operation switch (not shown) of the drive motor 6 is turned on, that is, when the drive motor 6 is operated. Send an operation signal. The control panel 71 is mounted on the front surface of the vehicle interior, and has various control switches (not shown) for switching between heating operation and cooling operation, switching between inside and outside air, switching between air outlets, and setting desired conditions in the vehicle interior. Then, an electric signal (for example, a heating signal or a cooling signal) corresponding to various control switches is sent to the control circuit 15. Temperature sensor 72
Detects the temperature of the hot water in the heat retaining tank 54, converts the detected temperature into an electric signal, and sends the electric signal to the control circuit 15. Further, the temperature sensor 73 detects the temperature of the hot water on the upstream side of the electromagnetic valve 51, converts the detected temperature into an electric signal, and sends the electric signal to the control circuit 15.

Next, the air conditioner 1 for an electric vehicle will be described.
0 will be briefly described with reference to FIGS.
FIG. 4 is a flowchart showing an example of the operation of the control circuit 15 during charging. First, it is determined whether or not a charging signal has been input from the control computer 70 (step S1). If the determination result of step S1 is No, the control of step S1 is performed. If the result of the determination in step S1 is Yes, it is determined whether or not the temperature Tw1 of the hot water detected by the temperature sensor 72 has fallen below the set temperature TL ° C. (eg, 10 ° C.) (step S2).
If the determination result of step S2 is No, the control of step S1 is performed. If the determination result in step S2 is Yes, the electric heater 43 is turned on (step S3), and thereafter, the temperature TW1 of the hot water detected by the temperature sensor 72 rises to the set temperature THC (for example, 90C) or more. It is determined whether or not it has been performed (step S4). If the determination result of step S4 is No, the control of step S4 is performed. If the determination result of step S4 is Yes, the electric heater 43 is turned off (step S5), and thereafter, the control of step S1 is performed. Therefore, at the time of charging, the hot water in the heat retaining tank 54 is heated by the electric heater 43 so that the temperature thereof becomes, for example, 90 ° C., and the hot water is stored for immediate heating during the heating operation when riding. If a PTC heater having a Curie point of 90 ° C. is used instead of the electric heater 43 as the first heating means, the above control becomes unnecessary.

FIG. 5 is a flow chart showing an example of the operation of the control circuit 15 when riding. First, it is determined whether or not an operation signal has been input from the control computer 70. That is, it is determined whether or not the operation switch of the driving motor 6 is turned on (step S11). If the determination result of step S11 is No, step S11
11 is performed. If the result of the determination in step S11 is Yes, the electric motor 60 of the circulation pump 47 is turned on and the solenoid valve 52 is turned off (step S12). Thereafter, the temperature Tw2 of the hot water detected by the temperature sensor 73 is set. It is determined whether or not the temperature has risen to T1 ° C. (for example, 90 ° C.) or higher (step S13). If the determination result in step S13 is No, the solenoid valve 51, the outdoor heat exchanger 4
The electric fan 59 of No. 6 is turned off (step S14), and then the control of step S11 is performed. Therefore, the temperature Tw2 of the hot water detected by the temperature sensor 73 becomes the set temperature T1 ° C.
If the temperature is lower than (for example, 90 ° C.), the first waste heat recovery unit 44 → the second waste heat recovery unit 45 → the circulation pump 47 → the bypass 58 → the hot water in which the hot water circulates through the first waste heat recovery unit 44 A circuit is formed. Therefore, the temperature of the hot water rises due to the waste heat of the driving motor 6 and the inverter 5. If the determination in step S13 is Yes, the solenoid valve 5
1. The electric fan 59 of the outdoor heat exchanger 46 is turned on (step S15), and then the control of step S11 is performed.
Therefore, the temperature Tw2 of the hot water detected by the temperature sensor 73
Rises to a set temperature T1 ° C. (eg, 90 ° C.) or more, the first waste heat recovery unit 44 → the second waste heat recovery unit 45 → the circulation pump 47 → the solenoid valve 51 → the outdoor heat exchanger 46 → the first waste heat A hot water circuit in which hot water circulates through the heat recovery unit 44 is formed. Therefore, by radiating the retained heat of the hot water in the outdoor heat exchanger 46, the overheating of the drive motor 6 can be prevented.

FIG. 6 is a flow chart showing one example of the operation of the heating operation of the control circuit 15 when the passenger gets on the vehicle. First, it is determined whether a heating signal has been input from the control panel 71 (step S21). This step S21
Is No, the blower motor 22, the electric motors 60 and 61 of the circulation pumps 47 and 48, the three-way valve 4
The electromagnetic coils 62 and 63 of 9 and 50 are turned off (end of the heating operation) (step S22), and then the control of step S21 is performed. In addition, the determination result of step S21 is Yes
In this case, the blower motor 22, the electric motor 61 of the circulation pump 48, the electromagnetic coil 62 of the three-way valve 49 are turned on, and the electric motor 35 of the refrigerant compressor 23, the electric fan 36 of the outdoor heat exchanger 27, and the three-way valve 50 are turned on. The heating operation A for turning off the electromagnetic coil 63 is performed (step S23). After that, the control of step S24 is performed. In this heating operation A, the heat retaining tank 5
4 → Hot water heater 41 → Circulation pump 48 → First hot water circuit in which hot water circulates in heat insulation tank 54 is formed. Thus, for example, hot water of 90 ° C. stored in the heat retaining tank 54 during charging circulates in the hot water heater 41. Therefore, the air flow path 2
The air flowing inside 1 is heated by high-temperature hot water when passing through the hot-water heater 41. Therefore, the temperature of the air blown out from the outlet is high, and the temperature in the vehicle compartment rises quickly, so that the heating of the vehicle compartment can start up quickly.

Then, the temperature Tw2 of the hot water detected by the temperature sensor 73 is obtained from the temperature Tw1 of the hot water detected by the temperature sensor 72.
It is determined whether or not is high (step S24). If the determination result of step S24 is No, step S2
1 is performed. Also, if the determination result of step S24 is Y
In the case of es, heating operation B is performed in which the electric motor 60 of the circulation pump 47, the electromagnetic coils 62 and 63 of the three-way valves 49 and 50, and the electromagnetic valve 52 are turned on, and the electric motor 61 of the circulation pump 48 is turned off (step). S25). Thereafter, the control in step S26 is performed. In this heating operation B, the heat retention tank 54
→ Hot water heater 41 → First waste heat recovery unit 44 → Second waste heat recovery unit 45 → Circulation pump 47 → Second hot water circuit in which hot water circulates through heat retention tank 54 is formed. Therefore, the driving motor 6
And the hot water heated by the waste heat of the inverter 5 circulates in the hot water heater 41. For this reason, the air flowing in the air flow path 21 is heated by the high-temperature hot water when passing through the hot-water heater 41, so that the heating state of the vehicle compartment is ensured without operating the refrigeration cycle 13. Therefore, the consumption of the battery 4 can be suppressed, so that the traveling distance of the electric vehicle 1 increases. In addition, the heat retention tank 54 smoothes out some of the waste heat of the driving motor 6 and the inverter 5 due to the change in the running pattern of the electric vehicle 1, thereby providing an excellent feeling of heating.

Then, it is determined whether or not the temperature Tw1 of the hot water detected by the temperature sensor 72 is lower than a set temperature T2 ° C. (for example, 45 ° C.) (step S26). If the decision result in the step S26 is No, the step S2
6 is performed. Also, if the determination result of step S26 is Y
In the case of es, the electric motor 35 of the refrigerant compressor 23, the electromagnetic valve 34, and the electric fan 36 of the outdoor heat exchanger 27 are turned on, and the heating operation C for switching the four-way valve 29 to the heating operation side is performed (Step S10). S27). After that, step S2
8 is performed. In the heating operation C, when there are many stops in the traveling pattern of the electric vehicle 1, the waste heat of the driving motor 6 and the inverter 5 is reduced, so that the heating degree of the hot water is reduced, so that the heating capacity in the vehicle compartment is reduced. descend. For this reason, when the temperature of the hot water in the heat retaining tank 54 falls below, for example, 45 ° C., the heating operation of the refrigeration cycle 13 is performed to secure the heating state of the vehicle interior. The flow of the refrigerant in the refrigeration cycle 13 in the heating operation C is:
Refrigerant compressor 23 → four-way valve 29 → check valve 30 → first indoor heat exchanger 24 → pressure reducing device 25 → solenoid valve 34 → check valve 33 →
Outdoor heat exchanger 27 → four-way valve 29 → accumulator 28
→ It becomes the refrigerant compressor 23.

Then, it is determined whether or not a set time t1 (for example, one hour) has elapsed since the start of the control in step S27 (step S28). This step S2
If the determination result of No. 8 is No, the control of step S28 is performed. If the determination result of step S28 is Yes, it is determined that the outdoor heat exchanger 27 has formed frost, and the electric motor 60 and the solenoid valve 52 of the circulation pump 47 are turned on, and the three-way valves 49 and 50 are turned off. (Step S)
29). Thereafter, the control in step S30 is performed. That is, by performing the heat storage operation of the hot water heating device 14,
A third hot water circuit is formed in which the warm water is circulated through the heat retaining tank 54 → the bypass path 55 → the first waste heat recovery device 44 → the second waste heat recovery device 45 → the circulation pump 47 → the heat retaining tank 54. Therefore, warm water heated by waste heat of the driving motor 6 and the inverter 5 is stored in the heat retaining tank 54.

It is determined whether a set time t2 (for example, 15 minutes) has elapsed since the start of the control in step S29 (step S30). If the determination result in step S30 is No, the control in step S30 is performed. When the determination result of step S30 is Yes, the electric motor 61 of the circulation pump 48 and the electromagnetic coil 62 of the three-way valve 49 are turned on, and the electromagnetic coil 63 of the three-way valve 50 is turned on.
A heating operation D for turning off the solenoid valve 52 is performed (step S3).
1). Thereafter, the control of step S32 is performed. In the heating operation D, since the first hot water circuit in which the hot water circulates through the heat retaining tank 54 → the hot water heater 41 → the circulation pump 48 → the heat retaining tank 54 is formed, the hot water circulates again through the hot water heater 41, The cabin is heated again.

At the same time, a defrosting operation is performed in which the solenoid valve 34 is turned off and the four-way valve 29 is switched to the cooling operation side (step S3).
2). After that, the control of step S33 is performed. That is, by performing the defrosting operation of the refrigeration cycle 13, the flow of the refrigerant in the refrigeration cycle 13 is changed to the refrigerant compressor 23 → the four-way valve 29 → the outdoor heat exchanger 27 → the check valve 31 → the first indoor heat exchanger 24. → pressure reducing device 25 → second indoor heat exchanger 26 → check valve 32 → four-way valve 29 → accumulator 28 → refrigerant compressor 23. Therefore, when the high-temperature refrigerant gas flows into the outdoor heat exchanger 27, the outdoor heat exchanger 27
Frost is removed. Also, at this time, the first indoor heat exchanger 24 functions as a refrigerant condenser, so that the heating state of the vehicle interior is ensured even during such a defrosting operation. Thereafter, it is determined whether or not a set time t3 (for example, 15 minutes) has elapsed since the start of the control in step S33 (step S33). If the determination result in step S33 is No, the control in step S33 is performed. Step S
If the result of the determination at 33 is Yes, the control of step S21 is performed.

As described above, the air-conditioning apparatus 10 of this embodiment uses the hot water in the heat retaining tank 54 heated by the electric heater 43 during charging of the battery 4 to heat the electric vehicle 1 when riding on the electric vehicle 1. By heating the vehicle interior by flowing into the hot-water heater 41 at the beginning of the operation, even if the outside air temperature is low, the rise of the heating of the vehicle interior is accelerated, and the vehicle interior is immediately heated. In addition, when the electric vehicle 1 gets on the vehicle, the first and second waste heat recovery units 44 and 45 circulate hot water heated by the waste heat of the drive motor 6 and the inverter 5 to the hot water heater 41 to increase the heating capacity. By temporarily operating the refrigeration cycle 13 when it decreases,
Since the vehicle interior can be heated without greatly draining the battery 4, the traveling distance of the electric vehicle 1 is increased. Further, at this time, since the first and second waste heat recovery units 44 and 45 and the heat retaining tank 54 are used in a series circuit, the electric vehicle 1
Instability of the amount of waste heat coming from the traveling pattern is smoothed, and the heating capacity is stabilized.

[Modification] In this embodiment, the refrigeration cycle 1
In the heating operation 3, the outdoor heat exchanger 27 is determined to have formed frost at the set time t1 (for example, 1 hour) and switched to the defrosting operation. However, the set time t1 may be changed according to the outside air temperature.
In this embodiment, the electric heater 43 is used as the first heating means, but another heating means such as a PTC heater may be used as the first heating means. Further, the electric heater 43 may be used at the time of the heat storage operation of the hot water heating device 14. Further, a method may be used in which a heat storage agent utilizing latent heat is placed in a separate container in the heat retaining tank 54, and the heat storage of the heat storage agent is used for heating hot water. In this embodiment, the driving motor 6 and the inverter 5 are used as the electric components, but other electric components such as a headlight of the electric vehicle 1 may be used. In this embodiment, the hot water heater 41 is disposed in the air duct 11, but the hot water heater 41 may be directly installed in the vehicle compartment.

[0026]

According to the present invention, the interior of the vehicle can be heated while the consumption of the battery is suppressed, so that the traveling distance of the electric vehicle can be prevented from being reduced. In addition, the heating of the vehicle interior can be quickly started to quickly heat the vehicle interior.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a hot water type heating device applied to the present invention.

FIG. 2 is a configuration diagram showing a refrigeration cycle applied to the present invention.

FIG. 3 is a configuration diagram showing an electric vehicle applied to the present invention.

FIG. 4 is a flowchart showing an example of an operation at the time of charging of a control circuit applied to the present invention.

FIG. 5 is a flowchart showing an example of an operation of the control circuit applied to the present invention at the time of boarding.

FIG. 6 is a flowchart illustrating an example of an operation of a heating operation at the time of boarding of the control circuit applied to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electric vehicle 3 Charger (external power supply) 4 Battery (in-vehicle power supply) 5 Inverter (electric part) 6 Driving motor (electric part) 13 Refrigeration cycle 14 Hot water type heating device 15 Control circuit 23 Refrigerant compressor 24 1st indoor heat Exchanger 25 Decompression device 26 Second indoor heat exchanger 27 Outdoor heat exchanger 41 Hot water heater 42 Hot water circulation path 43 Electric heater (first heating means) 44 First waste heat recovery device (second heating means) 45 Second Waste heat recovery unit (second heating means) 49 Three-way valve (switching means) 50 Three-way valve (switching means) 54 Insulation tank

Continuing from the front page (72) Keita Honda, 1-1-1, Showa-cho, Kariya-shi, Aichi, Japan Inside Denso Co., Ltd. (72) Inventor Kunio Iriya 1-1-1, Showa-cho, Kariya-shi, Aichi, Japan 58) Field surveyed (Int.Cl. ⁷ , DB name) B60H 1/22

Claims (5)

(57) [Claims] 1. A hot water heater that heats the interior of a vehicle by exchanging heat between hot water and air, (b) a hot water circuit that circulates hot water through the hot water heater, and (c) a hot water circulation. (D) a first heating means for heating hot water in the heat storage tank when electric power is supplied from an external power supply, and (e) a vehicle power supply. A second method of heating hot water in the hot water circulation path by waste heat of an electric component that operates when more power is supplied;
A heating device for an electric vehicle, comprising a heating unit. 2. A first hot water circuit for circulating hot water through the hot water circulation path to the hot water heater and the heat retaining tank;
A second hot water circuit that circulates hot water through the hot water circulation path to the hot water heater, the second heating unit, and the heat retaining tank; and a switching unit that switches from the first hot water circuit to the second hot water circuit. The heating device for an electric vehicle according to claim 1, further comprising: 3. A refrigerant compressor for compressing a refrigerant, an indoor heat exchanger for condensing the refrigerant, a decompression device for decompressing the refrigerant, and an outdoor heat exchanger for evaporating the refrigerant. And a refrigeration cycle capable of performing a heating operation to heat the vehicle interior by exchanging heat with the air conditioner, wherein the indoor heat exchanger is installed downstream of the hot water heater in the air flow direction. The heating device for an electric vehicle according to claim 1. 4. When it is determined that the outdoor heat exchanger has formed frost, the second heating means heats the hot water in the hot water circulation path and circulates the heated hot water to the hot water heater. The heating device for an electric vehicle according to claim 3, wherein the heating unit heats the vehicle interior. 5. When the outdoor heat exchanger determines that frost has formed, power is supplied from an onboard power supply to the first heating means,
4. The electric device according to claim 3, wherein the first heating unit heats the hot water in the hot water circulation path, and circulates the heated hot water to the hot water heater to heat the vehicle interior. 5. Automotive heating system.