JP5871115B2 - Electric drive vehicle heating system - Google Patents

Description

  The present invention relates to a heating device for an electric drive vehicle such as an electric vehicle or a hybrid vehicle, and more particularly to a heating device for an electric drive vehicle provided with an electric heater for heating.

  2. Description of the Related Art Conventionally, an electric vehicle and a hybrid vehicle include an engine, a generator driven by the engine, a battery, and a motor that generates electric power for driving by being supplied with the battery, and is charged with a battery state of charge (SOC). When (Charge) is low, the battery is charged by driving the generator until the SOC exceeds a predetermined set reference value.

  Usually, an electrically driven vehicle is provided with an electric heater for heating to warm the vehicle interior, and the electric heater for heating is supplied with power from a battery in the same manner as the drive motor. When the electric heater is turned on at the time of cold start of the vehicle, particularly when the SOC is lowered, power is supplied from the battery to the electric heater and at the same time, the battery is supplied and charged. Therefore, since both the battery and the electric heater are supplied with electric power from the battery, there is a problem that the heating performance of the electric heater is lowered and the motor driving force cannot be sufficiently secured.

  The heating device for an electrically driven vehicle of Patent Document 1 includes an engine, a generator, a battery, a travel drive motor, an electric heater, an engine control means for controlling the engine speed, and a power generation load of the travel drive motor. And a power generation load estimating means for estimating the engine, and when the engine is warming up and there is a heating request from the passenger, the engine control means controls the throttle opening of the engine according to the estimated power generation load. In this heating device, the sum of the power consumption of the electric heater, the required battery charging power and the vehicle power consumption is obtained, the power corresponding to the sum is estimated as the power generation load of the motor, and the power corresponding to the power generation load is generated. Since the engine is driven as described above, sufficient heating performance of the vehicle can be ensured.

JP 2008-168699 A

  Since the heating device for an electrically driven vehicle of Patent Document 1 drives the engine so as to generate electric power according to the power generation load even when the SOC is lowered, the power generation of the generator satisfying the battery charging required power and the heating performance. The amount can be secured. However, since the throttle opening of the engine is controlled in accordance with the power generation load based on the sum of the electric power consumption of the electric heater and the required battery charging power, the engine is controlled to a high-speed operation that emphasizes power generation. There is a risk that the fuel consumption of the engine originally targeted by the drive vehicle will be reduced.

  In addition, when the engine is driven to charge the battery, it is one of the options to maintain the engine operating state in a driving state where the engine driving efficiency gives priority to improving fuel efficiency. When the power generated by the generator is limited and there is a heating request from the occupant, it is necessary to stop power supply to one of the battery and the electric heater. Even if the power generated by the generator is distributed to both the battery and the electric heater, the limited power generated does not provide enough power to be supplied to each of them. Can't get.

  An object of the present invention is to provide a heating device for an electrically driven vehicle capable of ensuring both motor driving force by a battery and heating performance of an electric heater for heating while preventing deterioration in fuel consumption of the engine.

The heating device for an electrically driven vehicle according to claim 1 includes an engine, a generator driven by the engine, a high-voltage main battery capable of charging electric power generated by the generator, and an electrical connection to the main battery. And a sub-battery having a voltage lower than that of the main battery, a motor that is fed from the main battery to generate a driving force, an electric heater for heating that is fed from the sub-battery and heats the air in the vehicle compartment, in the heating apparatus for an electric drive vehicle equipped with DC / DC converter provided with, and control means for controlling said heating electric heater and the DC / DC converter between the main battery and sub-battery, electric for the heating The heater can dissipate heat at a low power supply voltage, and at a high power supply voltage, the heater can release heat higher than a low power supply voltage. The control means is configured to exert a thermal effect, and the control means supplies power from the main battery to the sub-battery via the DC / DC converter when the charging state of the main battery is higher than a set charging state. In a permitted state, the power supply from the sub-battery to the heating electric heater is cut off, and the electric power before conversion by the DC / DC converter is directly supplied from the main battery to the heating electric heater to charge the main battery. when the state is lower than the set charged state, from the main battery to the heating electric heater from the main battery while power from the sub battery while interrupting the power supply to the sub-battery to the heating electric heater It is characterized by cutting off the power supply .

In this heating apparatus for an electrically driven vehicle, since the heating electric heater is supplied with power from the sub-battery, the heating electric heater can be supplied without consuming power of the main battery. In addition, since a sub-battery electrically connected to the main battery and a DC / DC converter provided between the main battery and a sub-battery having a lower voltage than the main battery are provided, The form of power supply to the battery can be switched between a cut-off state and an allowable state according to the charge state of the main battery.

According to a second aspect of the present invention, in the first aspect of the invention, there is provided a heater for heating air in a vehicle interior using heat of the engine, and the control means has an engine temperature during operation equal to or higher than a set temperature. The operation of the electric heater for heating is stopped, and the heater for heating is operated.

According to the first aspect of the present invention, when the state of charge of the main battery is higher than the set state of charge, the electric power generated by the generator can be supplied from the main battery to the heating electric heater. The previous high-voltage power can be supplied to the heating electric heater, and the heating efficiency in the passenger compartment can be improved.
In addition, when the main battery charge state is lower than the set charge state, the heating electric heater can be operated without consuming the main battery power. Can be planned. Moreover, since the heating performance can be secured without consuming the power of the main battery, the operating state of the engine can be maintained in a driving state with high driving efficiency giving priority to fuel efficiency improvement, and even when there is a heating request by the occupant, The main battery can be charged at an early stage to ensure the motor driving force, and as a result, sufficient running performance can be obtained.

According to the invention 請 Motomeko 2, in order to heat the passenger compartment by the heating heater utilizing the heat of the engine, power consumption can be suppressed in both batteries while ensuring the heating performance.

It is a whole block diagram of the heating apparatus which concerns on Example 1 of this invention. It is a flowchart of heating control. It is a figure which shows an engine, the electric heater for heating, the heater for heating, and the channel | path for an air conditioning. It is a whole block diagram of the heating apparatus which concerns on Example 2. FIG.

  Hereinafter, modes for carrying out the present invention will be described based on examples.

Embodiment 1 of the present invention will be described below with reference to FIGS.
As shown in FIG. 1, the electric vehicle EV includes an engine 1, a generator 2, a high voltage main battery 3, and a sub battery that is electrically connected to the main battery 3 and has a lower voltage than the main battery 3. 12, a DC / DC converter 10 provided between the main battery 3 and the sub-battery 12, a traction motor 4 as a travel drive source, and an electric heater for heating that can heat air in the vehicle interior using electric power 6, a heating heater 11 capable of heating the air in the vehicle interior using the heat of the engine 1, a control means 7, and the like.

  The engine 1 is formed by an internal combustion engine (for example, a rotary engine) mounted on the electric vehicle EV, and when the charging state (SOC) of the main battery 3 is in a charging traveling mode in which the setting value A0 (for example, 30%) or less is When the operation is started and the SOC is in the discharge travel mode in which the SOC exceeds the set value A0, the operation is stopped. The output shaft of the engine 1 is connected to the rotating shaft of the generator 2. As shown in FIGS. 1 and 2, the engine 1 includes a supply passage 14 a that supplies the cooling water for the engine 1 to the heating heater 11 provided in the air conditioning passage 15, and the cooling water for the engine 1 from the heating heater 11. A recirculation passage 14 b that recirculates to the engine 1. The supply passage 14a is provided with a valve body (not shown) that allows the flow of cooling water from the engine 1 to the heater 11 for heating. The valve body is configured to open when the coolant temperature T of the engine 1 is equal to or higher than a set temperature Te (for example, 85 ° C.), and to close when the temperature is lower than the set temperature Te.

The generator 2 is formed by a generator (for example, a three-phase AC alternator), and is configured to be able to generate power by the rotational driving force of the engine 1. The generator 2 includes phase coils corresponding to the U phase, the V phase, and the W phase, and the end portions of these phase coils are electrically connected to the first inverter 8. The three-phase AC power generated by the generator 2 is converted into predetermined DC power (for example, 200 to 250 V) by the first inverter 8 and output.
The 1st inverter 8 is a well-known power converter provided with U phase, V phase, and W phase electrically arranged in parallel. The output terminal of the first inverter 8 is electrically connected to the main battery 3, the second inverter 9, the DC / DC converter 10, and the switching means 13.

  The second inverter 9 is configured in substantially the same manner as the first inverter 8. The second inverter 9 converts the DC power from the main battery 3 or the first inverter 8 into three-phase AC power (for example, 200 to 650 V) and outputs it to the traction motor 4. A rotation shaft of the motor 4 is connected to a drive shaft 32 that can rotate integrally with the drive wheel 31 via a differential gear member 33, and travel driving force is transmitted from the traction motor 4 to the drive wheel 31. The drive shaft 32 is provided with a disc-shaped brake disc 34a and a brake device 34b that presses the brake disc 34a to generate a braking force of the electric vehicle EV. When the vehicle decelerates, the kinetic energy of the drive shaft 32 is transmitted to the motor 4 side, and the motor 4 operates as a generator to convert the transmitted kinetic energy into three-phase AC power. The three-phase AC power is converted into predetermined DC power by the second inverter 9 and then charged to the main battery 3.

The main battery 3 is formed of a lithium battery, and is configured to be able to charge and discharge high voltage DC power output from the first inverter 8.
The sub-battery 12 is formed of a normal on-vehicle electric load power supply battery, and is configured to be able to charge and discharge low- voltage DC power (for example, 12 V) converted by the DC / DC converter 10.
The main battery 3 is not limited to a lithium battery, and may be a nickel metal hydride battery or a large-capacity capacitor (capacitor).

DC / DC converter 10 is provided with a stabilizing step-down circuit, the main battery 3 or the like first inverter 8, are convertible to form a direct current power of a high voltage supplied from the so-called high voltage system to the DC power of the low-voltage Yes. The DC / DC converter 10 is electrically connected to the sub-battery 12 and electrically connects the high-voltage system and the sub-battery 12 when the SOC exceeds a set value A1 (for example, 35%) higher than the set value A0. When the SOC is equal to or lower than the set value A1, the second form is configured to be switched to the second form that cuts off the connection between the high voltage system and the sub-battery 12.

The electric heater 6 for heating is an electric heater that is formed so as to be able to dissipate heat by supplying power and can switch a corresponding power supply level internally. The heating electric heater 6 can dissipate heat with a low voltage (for example, 12V), and exhibits a higher heat dissipation effect than a low voltage with a high voltage (for example, 200 to 250V). can do.
The heating electric heater 6 and the heating heater 11 are provided inside the air conditioning passage 15, and the heating electric heater 6 is installed adjacent to the upstream side position of the heating heater 11 in the front-rear direction. The heating electric heater 6 and the heating heater 11 are formed so as to be operable by an on / off operation of the heating button 5 provided in the passenger compartment.

The heating electric heater 6 is configured to be switchable between a connection state connected to the high voltage system and a connection state connected to the low voltage system on the sub battery 12 side via the switching means 13.
When the heating button 5 is turned on (there is a heating request by the occupant) and the cooling water temperature T of the engine 1 is equal to or higher than the set temperature Te, the switching means 13 switches between the heating electric heater 6 and both high and low voltage systems. Is interrupted. At this time, the 1st heating mode by the heater 11 for heating is performed.

  Further, when the heating button 5 is turned on, the switching means 13 switches between the heating electric heater 6 and the sub battery 12 when the cooling water temperature T of the engine 1 is lower than the set temperature Te and the SOC is not more than the set value A1. Connected and switched to the second heating mode. When the cooling water temperature T of the engine 1 is lower than the set temperature Te and the SOC is higher than the set value A1, the heating electric heater 6 and the high voltage system are connected to enter the third heating mode. It is formed to be switchable.

  As shown in FIG. 2, the air conditioning passage 15 is formed such that conditioned air flows from the right to the left in the drawing and is supplied to the vehicle interior. In the air conditioning passage 15, an electric heater 6 for heating, a heater 11 for heating, a damper 16, an evaporator 17 for cooling, and the like are provided. The entire amount of the conditioned air passes through the evaporator 17, and is then divided by the damper 16 into conditioned air that passes through the heating electric heater 6 and the heating heater 11 and conditioned air that passes through the bypass passage 18.

  When the cooling water temperature T of the engine 1 is equal to or higher than the set temperature Te, the heating heater 11 is supplied with cooling water in which the amount of heat of the engine 1 is accumulated, and heats the conditioned air by exchanging heat between the cooling water and the conditioned air. doing. In the first heating mode, the valve body provided in the supply passage 14a is opened, the cooling water of the engine 1 is supplied to the heater 11 for heating, and then the cooling water that has exchanged heat with the conditioned air is returned to the reflux passage 14b. And flows back to the engine 1.

  The damper 16 is formed so that the flow rate ratio between the conditioned air passing through the heating electric heater 6 and the heating heater 11 and the conditioned air passing through the bypass passage 18 can be arbitrarily adjusted. The damper 16 is driven by an electromagnetic actuator (not shown). The evaporator 17 is formed as a cooling device for conditioned air using a refrigerant.

Next, the control means 7 will be described with reference to FIG.
The control means 7 controls the engine 1, the generator 2, the heating electric heater 6, the DC / DC converter 10, the heating heater 11, and the like. The control means 7 includes a vehicle control means (VCM) 21, an operating condition control means (RLCM) 22, an ECU (Engine Control Unit) 23, a generator control means (GCM) 24, a first battery control means (1BCM). ) 25, second battery control means (2BCM) 26, traction motor control means (TMCM) 27, and ABS (Antilock Brake System) 28.

  The VCM 21 switches the traveling state to one of the traveling control modes of the discharging traveling mode and the charging traveling mode according to the SOC of the main battery 3, and the operating state of the engine 1 when the passenger turns on the heating button 5. The electric vehicle EV is integratedly controlled so that the heating state is switched to any one of the first to third heating modes based on the engine temperature (cooling water temperature) and the SOC of the main battery 3. The VCM 21 is connected to the RLCM 22, the 1BCM 25, the 2BCM 26, the TMCM 27, and the ABS 28 so as to be able to communicate with each other, and cooperatively controls the respective control means according to information from each control means.

The VCM 21 determines that the electric vehicle EV is in the electric discharge traveling mode when the SOC exceeds the set value A0 after the electric vehicle EV starts traveling. In the discharge travel mode, the electric vehicle EV stops the operation of the engine 1 and drives the motor 4 with power supplied from the main battery 3.
After traveling the predetermined distance, the VCM 21 determines that the charging travel mode is in effect when the SOC decreases to the set value A0 or less. In the charging travel mode, the electric vehicle EV starts operation of the engine 1 and the generator 2 supplies power to the main battery 3 and the motor 4.
After the main battery 3 starts charging, when the SOC increases to a set value A2 (for example, 95%) higher than the set value A1, the VCM 21 switches the travel control mode from the charge travel mode to the discharge travel mode.

The RLCM 22 supervises the ECU 23 and the GCM 24 and sets the operating conditions of the engine 1 and the power generation conditions of the generator 2 according to the determined traveling control mode.
The RLCM 22 has a high fuel efficiency and a high driving efficiency obtained by experiments or the like on the condition that the throttle valve (not shown) of the engine 1 is fully opened and the engine speed is constant. A high driving map is stored in advance.

The ECU 23 controls the engine 1 based on the operation map set by the RLCM 22. Various detection signals such as the engine speed, intake air amount, cooling water temperature, and the like are input to the ECU 23, and conditions such as the fuel injection amount, fuel injection timing, exhaust valve opening timing, and ignition timing are set based on the operation map. The operation of the engine 1 is controlled based on the set conditions.
In the discharge travel mode, the ECU 23 stops the operation of the engine 1.

  When the occupant turns on the heating button 5 and the cooling water temperature T of the engine 1 is equal to or higher than the set temperature Te, the ECU 23 opens the valve body provided in the supply passage 14a so that the cooling water temperature T of the engine 1 is When the temperature is lower than the set temperature Te, the valve body provided in the supply passage 14a is closed to control the flow of the cooling water of the engine 1. Thereby, when the coolant temperature T of the engine 1 is equal to or higher than the set temperature Te, the first heating mode is executed.

  The GCM 24 controls the power generation of the generator 2 so that the predetermined power set by the RLCM 22 is output. The GCM 24 converts the three-phase alternating current power generated by the generator 2 by the first inverter 8 into direct current power of 200 to 250 V in the charging travel mode, and the main battery 3, the second inverter 9, and the heating electric heater 6. Etc.

As described above, in the charging travel mode, the DC power output from the first inverter 8 includes the power charged in the main battery 3, the power supplied to the motor 4 through the second inverter 9, and the switching unit 13. Between the electric power supplied to the heating electric heater 6 via the electric power and the electric power charged to the sub-battery 12 via the DC / DC converter 10.
In the discharge travel mode, the DC power output from the main battery 3 is charged to the power supplied to the motor 4 via the second inverter 9 and to the sub-battery 12 via the DC / DC converter 10. Distributed to power.

  The 1BCM 25 controls the main battery 3 in accordance with the travel control mode determined by the VCM 21. The 1BCM 25 detects the current, voltage, and temperature of the main battery 3, and is configured to be able to calculate the SOC of the main battery 3 from the current and voltage, and outputs the main battery temperature, SOC, and the like to the VCM 21. The 1BCM 25 charges the main battery 3 with the DC power output from the first inverter 8 when in the charge travel mode, and discharges the DC power from the main battery 3 when in the discharge travel mode.

The 2BCM 26 controls the DC / DC converter 10 and the switching unit 13.
The 2BCM 26 connects the high voltage system and the sub battery 12 when the SOC exceeds the set value A1 (first form), and disconnects the high voltage system and the sub battery 12 when the SOC is equal to or less than the set value A1 ( The DC / DC converter 10 is controlled to be switched as in the second mode. Thereby, when the DC / DC converter 10 is a 1st form, the sub battery 12 is charged.

  When the heating button 5 is turned on and the occupant requests heating, the 2BCM 26 establishes an electrical connection between the heating heater 6 and the high and low voltage systems when the cooling water temperature T of the engine 1 is equal to or higher than the set temperature Te. When the cooling water temperature T of the engine 1 is lower than the set temperature Te and the SOC is lower than the set value A1, the heating electric heater 6 and the sub battery 12 are connected, and the cooling water temperature T of the engine 1 is lower than the set temperature Te. When the SOC exceeds the set value A1, the switching means 13 is controlled to be switched so as to connect the electric heater 6 for heating and the high voltage system. Thereby, the 2nd heating mode and the 3rd heating mode are performed.

The TMCM 27 controls the output torque of the motor 4 so that various detection signals such as an accelerator pedal depression amount by an occupant are input and a predetermined driving force set by the RLCM 22 is output. This TMCM 27 converts DC power into three-phase AC power by the second inverter 9 and outputs it to the motor 4.
The ABS 28 receives various detection signals such as a brake pedal depression amount by an occupant, and controls the pressing force and pressing timing of the brake disc 34a by the brake device 34b.

Next, heating control of the electric vehicle EV will be described based on the flowchart of FIG. Si (i = 1, 2,...) Indicates each step.
In this embodiment, during normal travel, the electric vehicle EV is controlled to travel in the charge travel mode and the discharge travel mode according to the SOC. The main heating control is executed as a process independent of the travel control when the heating button 5 is turned on.

First, it is determined whether there is a heating request from an occupant (S1).
When the heating button 5 is turned on as a result of the determination in S1, there is a heating request from the occupant, so that the process proceeds to S2 to determine whether the engine 1 is in operation. As a result of the determination in S1, when the heating button 5 is turned off, the heating control is terminated.

  If the engine 1 is operating as a result of the determination in S2, the process proceeds to S3 and it is determined whether or not the coolant temperature T of the engine 1 is equal to or higher than the set temperature Te. As a result of the determination in S3, when the cooling water temperature T of the engine 1 is equal to or higher than the set temperature Te, the cooling water of the engine 1 can heat the conditioned air, so the process proceeds to S4 and the first heating mode is executed. In S4, the valve body provided in the supply passage 14a is opened. Thereby, the cooling loss of the engine 1 can be utilized, and the temperature of the passenger compartment can be raised regardless of the SOC.

If the cooling water temperature T of the engine 1 is lower than the set temperature Te as a result of the determination in S3, the cooling water temperature T is low, so the process proceeds to S5 and it is determined whether the SOC of the main battery 3 is equal to or lower than the set value A1.
As a result of the determination in S5, when the SOC of the main battery 3 is equal to or less than the set value A1, since the charging state of the main battery 3 is low, the process proceeds to S6 and the second heating mode is executed. In S <b> 6, the switching unit 13 is switched to connect the heating electric heater 6 and the sub battery 12. Thereby, the temperature in the passenger compartment can be raised without consuming the power of the main battery 3.

If the SOC of the main battery 3 is greater than the set value A1 as a result of the determination in S5, the state of charge of the main battery 3 is high, so the process proceeds to S7 and the third heating mode is executed. In S7, the switching means 13 is switched to connect the heating electric heater 6 and the high voltage system. Thereby, heating efficiency can be made high and a vehicle interior can be heated up early.
If the engine 1 is not operating as a result of the determination in S2, the process proceeds to S5.

Next, the operation and effect of the heating apparatus according to the first embodiment will be described.
Since this heating device can operate the heating electric heater 6 without consuming the electric power of the main battery 3 when the SOC of the main battery 3 is equal to or less than the set value A1, the charging of the main battery 3 and the heating electric heater 6 are accelerated. The heating performance can be ensured by. In addition, since the heating performance can be ensured without consuming the power of the main battery 3, the operating state of the engine 1 can be maintained in an operating state with high driving efficiency that prioritizes fuel efficiency improvement, and there is a heating request from the occupant However, the main battery 3 can be charged early to ensure the driving force of the motor 4, and as a result, sufficient running performance can be obtained.

When the SOC of the main battery 3 is greater than the set value A1, the control means 7 is configured to cut off power supply from the sub battery 12 to the heating electric heater 6 and to supply power from the main battery 3 to the heating electric heater 6. Therefore, the electric power generated by the generator 2 can be supplied from the main battery 3 to the heating electric heater 6, and the high- voltage electric power before conversion by the DC / DC converter 10 can be supplied to the heating electric heater 6. Heating efficiency can be improved.

  A heating heater 11 for heating the air in the passenger compartment using the heat of the engine 1 is provided, and the control means 7 controls the heating electric heater 6 when the cooling water temperature T of the operating engine 1 is equal to or higher than the set temperature Te. Since the operation is stopped and the heating heater 11 is operated, the vehicle interior can be heated by the heating heater 11 using the heat of the engine 1, and the power consumption of both the batteries 3 and 12 can be reduced while ensuring the heating performance. Can be suppressed.

  Next, the heating apparatus for the electric vehicle EVA according to the second embodiment will be described with reference to FIG. Only the configuration different from the electric vehicle EV of the first embodiment will be described, and the same members as those of the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

  The DC / DC converter 10 is electrically connected in parallel to the sub-battery 12 and the heating electric heater 6A. When the SOC exceeds a set value A1 higher than the set value A0, the high-voltage system and the sub-battery 12 are electrically connected. When the SOC is equal to or lower than the set value A1, the second form is configured to be switched between the high-voltage system and the sub-battery 12.

  The heating electric heater 6A is formed so as to be able to dissipate heat by supplying a low voltage (for example, 12V). The heating electric heater 6 </ b> A includes a relay switch 19 that can be interlocked with an on / off operation of the heating button 5. Thus, when the heating button 5 is turned on, the heating electric heater 6A is electrically connected to the sub-battery 12, and when the heating button 5 is turned off, the heating electric heater 6A and the sub-battery 12 are connected. Is electrically cut off.

The control means 7A includes a VCM 21, an RLCM 22, an ECU 23, a GCM 24, a 1BCM 25, a 2BCM 26A, a TMCM 27, and an ABS 28.
The 2BCM 26A controls the DC / DC converter 10 and the relay switch 19.
The 2BCM 26A connects the high voltage system and the sub battery 12 when the SOC exceeds the set value A1 (first form), and disconnects the high voltage system and the sub battery 12 when the SOC is equal to or less than the set value A1 ( The DC / DC converter 10 is controlled to be switched as in the second mode.
The 2BCM 26A allows the electric power supply from the sub battery 12 to the heating electric heater 6A when the heating button 5 is turned on, and the heating electric heater from the sub battery 12 when the heating button 5 is turned off. Power supply to 6A is prohibited.

  As a result, when the heating button 5 is turned on, if the cooling water temperature T of the engine 1 is equal to or higher than the set temperature Te, the vehicle interior can be heated regardless of the SOC using the cooling loss of the engine 1. When the cooling water temperature T of the engine 1 is lower than the set temperature Te, the passenger compartment can be heated without consuming the power of the main battery 3.

Next, a modification in which the above embodiment is partially changed will be described.
1) In the above embodiment, an example of an electric vehicle in which driving wheels are driven to rotate by a driving motor alone and the engine only charges is described. However, the driving motor and the engine rotate driving wheels according to the driving state. It can also be applied to a hybrid vehicle that is driven.

2) In the above embodiment, an example in which the heater heater medium is engine cooling water has been described. However, exhaust gas is used as the medium, and the amount of heat corresponding to the engine exhaust loss is used for heating the conditioned air. Is also possible. Moreover, although the example which act | operates separately the electric heater for heating and the heater for heating was demonstrated, when a cooling water temperature is high and SOC is high, when a passenger | crew requests an early temperature rise, it is also possible to operate both heaters It is.

3) In addition, those skilled in the art can implement the present invention by adding various modifications to the embodiments without departing from the spirit of the present invention, and the present invention includes such modifications. is there.

  The present invention provides a heating device for an electrically driven vehicle provided with an electric heater for heating, when the charging state of the main battery is low, shuts off the power supply from the main battery to the sub battery, and when the charging state of the main battery is high, By allowing power supply from the main battery to the sub-battery, it is possible to prevent deterioration in fuel consumption of the engine and to ensure both motor driving force by the battery and heating performance of the heating electric heater.

DESCRIPTION OF SYMBOLS 1 Engine 2 Generator 3 Main battery 4 Motor 6, 6A Heating electric heater 7, 7A Control means 10 DC / DC converter 11 Heating heater 12 Sub battery EV, EVA Electric vehicle

Claims (2)

An engine, a generator driven by the engine, a high-voltage main battery capable of charging electric power generated by the generator, and a sub-battery electrically connected to the main battery and having a lower voltage than the main battery A motor that is supplied with power from the main battery to generate a driving force, an electric heater for heating that is supplied with power from the sub-battery and that heats the air in the passenger compartment, and is provided between the main battery and the sub-battery. In a heating device for an electrically driven vehicle comprising a DC / DC converter, and a control means for controlling the heating electric heater and the DC / DC converter,
The heating electric heater is configured to be able to dissipate heat at a low power supply voltage and to exhibit a higher heat dissipation effect than a low power supply voltage at a high power supply voltage,
The control means includes
When the charge state of the main battery is higher than the set charge state, the power supply from the main battery to the sub battery via the DC / DC converter is allowed to the heating heater from the sub battery. Power supply is cut off from the main battery and the electric power before conversion by the DC / DC converter is directly supplied to the electric heater for heating,
Wherein when the state of charge of the main battery is lower than the set charging condition, the heating from the main battery while power from the sub battery to the heating electric heater while interrupting the power supply to the sub-battery from the main battery A heating device for an electrically driven vehicle, wherein power supply to the electric heater is cut off . A heater for heating the air in the passenger compartment using the heat of the engine;
2. The electric drive vehicle according to claim 1 , wherein when the engine temperature during operation is equal to or higher than a set temperature, the control unit stops the operation of the heating electric heater and operates the heating heater . Heating device.