JP7184540B2 - Electric bodywork drive system - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric mounting drive system for driving an electric motor of mounting equipment mounted on a hybrid vehicle.

Conventionally, there has been known a hybrid vehicle that uses an engine and a motor generator as driving sources (see, for example, Patent Document 1).

Japanese Patent Publication No. 2010-513137

By the way, some hybrid vehicles such as trucks are equipped with mounting equipment such as a freezer equipped with an electric motor such as an electric compressor. In such a hybrid vehicle, the electric motor may be required to be driven even when the vehicle is stopped. Especially in a freezer, when the electric compressor stops, there is a big problem that the frozen quality deteriorates.

As a method of driving the electric motor, an engine direct connection method in which the engine is connected to the electric motor to drive the electric motor, or a sub-engine method in which the electric motor is driven by a sub-engine mounted on the body equipment can be considered. However, either method requires the engine or sub-engine to be running when the vehicle is stopped, which poses problems of fuel consumption and noise.

Accordingly, it is an object of the present invention to provide an electric vehicle body drive system capable of driving an electric motor while the vehicle is stopped while suppressing fuel consumption and noise.

An electric vehicle body drive system according to the present invention is vehicle body equipment mounted on a hybrid vehicle, which includes an engine and a motor generator as a travel drive source, and a hybrid battery that supplies power to the motor generator and is charged by the motor generator. The electric vehicle body drive system for driving the electric motor of (1) includes a first power supply line electrically connected to the hybrid battery and the electric motor, and the electric motor is driven by receiving electric power from the hybrid battery.

In the electric vehicle body drive system according to the present invention, the hybrid battery and the electric motor are electrically connected by the first power supply line, and the electric motor receives power from the hybrid battery and is driven. As a result, even if the engine is stopped when the vehicle is stopped, the electric motor is powered by the hybrid battery and driven. Therefore, the electric motor can be driven when the vehicle is stopped while suppressing fuel consumption and noise.

A hybrid control unit that receives power from a low-voltage battery charged by rotation of the engine and controls power supply or charging of the hybrid battery; further comprising a transformer that converts to the output voltage of the voltage battery, a second power supply line that is electrically connected to the transformer and the hybrid control unit, and a power supply control unit that controls power supply to the hybrid control unit, The power supply controller may cause the hybrid controller to be powered from the transformer when the engine is stopped. In order to supply power from the hybrid battery to the electric motor, it is necessary to supply power to the hybrid controller. However, since the low-voltage battery is not charged when the engine is stopped, if power is supplied to the hybrid control unit only from the low-voltage battery, the consumption speed of the low-voltage battery increases, and the electric motor cannot be driven for a long time after the engine is stopped. can't In this electric vehicle body drive system, when the engine is stopped, the power supply control unit causes the hybrid control unit to supply power from the transformer that converts the voltage from the hybrid battery to the output voltage of the low voltage battery. can be suppressed. As a result, the electric motor can be driven for a long time after the engine is stopped.

The power supply control unit does not have to supply power from the transformer to the hybrid control unit when the engine is rotating. In this electric vehicle body drive system, power is not supplied from the transformer to the hybrid control unit while the engine is rotating, so it is possible to easily manage the amount of charge in the hybrid battery when the engine is rotating. .

The second power supply line may be electrically connected to a third power supply line that electrically connects the low voltage battery and the hybrid control section. In this electric vehicle body drive system, since the second power supply line is electrically connected to the third power supply line that electrically connects the low-voltage battery and the hybrid control unit, an increase in wiring is suppressed. Power can be supplied to the hybrid control from the transformer.

A relay that disconnects or connects the second power supply line may be further provided, and the power supply control unit may control power supply from the transformer to the hybrid control unit by controlling the relay. Since this electric vehicle body drive system is provided with a relay that disconnects or connects the second power supply line, the power supply control unit controls this relay to easily switch the presence or absence of power supply from the transformer to the hybrid control unit. be able to.

A switch for driving the electric motor even after the engine stops may be further provided, and the power supply control unit may cause the hybrid control unit to supply power from the transformer when the engine stops after the switch is operated. Depending on the state of the body equipment, it may not be necessary to drive the electric motor after the engine is stopped. Even in such a case, if the electric motor is driven after the engine is stopped, the hybrid battery is wasted. In this electric vehicle body drive system, the power supply control unit supplies power from the transformer to the hybrid control unit when the engine stops after the switch is operated. can prevent it from being done. As a result, wasteful consumption of the hybrid battery can be suppressed.

The power supply control section may be provided in the hybrid control section. In this electric vehicle-mounted drive system, since the power supply control section is provided in the hybrid control section, stoppage of the engine can be detected quickly and accurately.

The transformer may be provided in the bodywork equipment. In this electric bodywork drive system, the transformer is installed in the bodywork equipment, so if the bodywork equipment is equipped with equipment that is driven by the same voltage as the output voltage of the low-voltage battery, power is supplied to the equipment. can be driven by

The body equipment may be a freezer and the electric motor may be an electric compressor for cooling the freezer. With this electric body drive system, even if the engine is stopped when the vehicle is stopped, the electric compressor is powered by the hybrid battery, so it is possible to maintain the freezing quality of the freezer while suppressing fuel consumption and noise. can.

According to the present invention, the electric motor can be driven while the vehicle is stopped while suppressing fuel consumption and noise.

1 is a block configuration diagram of a hybrid vehicle provided with an electric vehicle body drive system according to an embodiment; FIG. 4 is a flowchart showing processing operations of the electric vehicle body drive system according to the embodiment; FIG. 10 is a block configuration diagram of a hybrid vehicle provided with an electric vehicle body drive system according to a modification; FIG. 10 is a block configuration diagram of a hybrid vehicle provided with an electric vehicle body drive system according to a modification;

Preferred embodiments of the present invention will now be described in detail with reference to the drawings. In the following description, the same or corresponding elements are denoted by the same reference numerals, and overlapping descriptions are omitted.

FIG. 1 is a block configuration diagram of a hybrid vehicle provided with an electric vehicle body drive system according to an embodiment. As shown in FIG. 1 , an electric mounted drive system 100 according to this embodiment is a system for driving an electric compressor 3 of a freezer 2 mounted on a hybrid vehicle 1 . A vehicle applied as the hybrid vehicle 1 is a commercial vehicle such as a truck. However, the hybrid vehicle 1 is not particularly limited, and may be any of a large vehicle, a medium-sized vehicle, an ordinary passenger vehicle, a small vehicle, a light vehicle, and the like.

The hybrid vehicle 1 includes an engine 4 and a motor generator 5 as driving sources, and a low-voltage battery 6 .

The engine 4 is, for example, an internal combustion engine such as a diesel engine or a gasoline engine. The motor generator 5 is a motor generator that functions as an electric motor or a generator. A clutch 7 is arranged between the engine 4 and the motor generator 5 , and the motor generator 5 is connected to the drive shaft of the hybrid vehicle 1 via an automatic transmission (AMT: Automated Manual Transmission) 8 . . Clutch 7 may be arranged between motor generator 5 and automatic transmission 8 instead of between engine 4 and motor generator 5 .

The low-voltage battery 6 is a vehicle-mounted battery charged by the rotation of the engine 4 . As the low-voltage battery 6, for example, a secondary battery such as a lead-acid battery can be used. The output voltage of the low voltage battery 6 is, for example, 24V.

A hybrid vehicle 1 includes a hybrid system 10 . A hybrid system 10 includes a hybrid battery 11 , an inverter 12 , an accessory device 13 , and a hybrid control section 14 .

The hybrid battery 11 supplies electric power (electric power) to the motor generator 5 and is charged by the motor generator. As the hybrid battery 11, for example, various secondary batteries such as lithium ion batteries can be used. The output voltage of the hybrid battery 11 is higher than the output voltage of the low voltage battery 6, for example 300V.

Inverter 12 is electrically connected to motor generator 5 and hybrid battery 11 . Inverter 12 converts the direct current input from hybrid battery 11 into alternating current and outputs the alternating current to motor generator 5 . Inverter 12 also converts alternating current input from motor generator 5 into direct current and outputs the direct current to hybrid battery 11 .

The accessory device 13 is various devices such as a fan provided in the hybrid system 10 .

The hybrid control unit 14 is also called an HVECU [Hybrid Vehicle Electronic Control Unit]. The hybrid control unit 14 is an electronic control unit having a CPU [Central Processing Unit], a ROM [Read Only Memory], a RAM [Random Access Memory], and the like. In the hybrid control unit 14, programs stored in the ROM are loaded into the RAM and executed by the CPU, thereby executing various controls. The hybrid control section 14 may be composed of a plurality of electronic control units.

The hybrid control unit 14 performs control so that the hybrid vehicle 1 has a plurality of driving modes. The operation modes of the hybrid vehicle 1 include a mode in which only the engine 4 is used as a running drive source, a mode in which the engine 4 and the motor generator 5 are used as a running drive source, and a mode in which only the motor generator 5 is used as a running drive source. Among these modes, there are a mode in which the hybrid battery 11 supplies power to the motor generator 5, a mode in which the hybrid battery 11 is charged from the motor generator 5, and the like.

The hybrid control unit 14 also includes a power supply control unit 20 that controls power supply to the hybrid control unit 14 . Details of the power supply control unit 20 will be described later.

The freezer 2 is mounted on the hybrid vehicle 1 to cool the inside of the freezer and freeze stored items therein. The freezer 2 includes an electric compressor 3 , a transformer 15 , a switch 16 and a refrigerator controller 17 .

The electric compressor 3 is an electric motor for cooling the freezer 2 . The electric compressor 3 is electrically connected to the hybrid battery 11 through the first power supply line A1, and receives power from the hybrid battery 11 to drive. The first power supply line A1 is a power supply line electrically connected to the hybrid battery 11 and the electric compressor 3, and includes one or more electric wires provided in the hybrid vehicle 1 and one or more electric wires provided in the freezer 2. and electric wire. The electric compressor 3 is powered by the hybrid battery 11 via the first power supply line A<b>1 and driven by the output voltage of the hybrid battery 11 .

Transformer 15 is electrically connected to first power supply line A<b>1 and converts the voltage from hybrid battery 11 to the output voltage of low voltage battery 6 . As the transformer 15, for example, a known DC/DC converter can be used. The transformer 15 is electrically connected to the inverter 12, the accessory device 13, and the hybrid control section 14 of the hybrid system 10 via the second power supply line A2. The second power supply line A2 is a power supply line that electrically connects the transformer 15, the inverter 12 of the hybrid system 10, the accessory device 13, and the hybrid control unit 14, and is composed of one or a plurality of electric wires. . More specifically, the inverter 12, the accessory device 13, and the hybrid control unit 14 of the hybrid system 10 are electrically connected to the low-voltage battery 6 by the third power supply line A3, and the second power supply line A2 is By being connected to the third power supply line A3, the inverter 12, the accessory device 13, and the hybrid control section 14 of the hybrid system 10 are electrically connected.

The second power supply line A2 is provided with a relay 18 for disconnecting or connecting the second power supply line A2. Therefore, while the second power supply line A2 is disconnected by the relay 18, electrical connections between the inverter 12, the accessory device 13, and the hybrid control unit 14 of the hybrid system 10 and the transformer 15 are disconnected. In this case, the inverter 12 , accessory device 13 , and hybrid control unit 14 of the hybrid system 10 are powered only by the low-voltage battery 6 and driven by the output voltage of the low-voltage battery 6 . On the other hand, when the second power supply line A2 is connected by the relay 18, the inverter 12, the accessory device 13, and the hybrid control unit 14 of the hybrid system 10 are electrically connected to the transformer 15. In this case, the inverter 12, the accessory device 13, and the hybrid control unit 14 of the hybrid system 10 are powered by the low-voltage battery 6 and the transformer 15, and the output voltage of the low-voltage battery 6 (the output voltage of the transformer 15) drive. The relay 18 switches between disconnection and connection of the second power supply line A2 under the control of the refrigerator control unit 17 .

In FIG. 1, a part of the third power supply line A3 is provided in the freezer 2, and the second power supply line A2 is connected to the part of the third power supply line A3 provided in the freezer 2. Although shown, all of the third feeder lines A3 may be provided in the hybrid vehicle 1, and in the hybrid vehicle 1, the second feeder line A2 may be connected to the third feeder line A3.

The switch 16 is a switch for driving the electric compressor 3 even after the engine 4 of the hybrid vehicle 1 has stopped. A switch 16 is provided in the freezer 2 and is operated by an operator such as a driver. The switch 16 transmits an ON signal to the refrigerator controller 17 when turned ON by the operator.

The refrigerator control unit 17 is a control unit that controls the driving of the electric compressor 3 based on the temperature inside the refrigerator. The refrigerator controller 17 is also called a refrigerator ECU (Electronic Control Unit). The refrigerator control unit 17 is an electronic control unit having a CPU, ROM, RAM, and the like. The refrigerator control unit 17 loads a program stored in the ROM into the RAM and executes various controls by the CPU. The refrigerator controller 17 may be composed of a plurality of electronic control units.

The refrigerator control unit 17 can communicate with the hybrid control unit 14 of the hybrid vehicle 1 using a CAN [Controller Area Network] communication circuit or the like. Upon receiving the ON signal from switch 16 , refrigerator control unit 17 transmits this ON signal to hybrid control unit 14 of hybrid vehicle 1 . Then, the refrigerator control unit 17 switches connection or disconnection of the relay 18 according to the instruction from the hybrid control unit 14 .

When the engine 4 stops after the switch 16 is operated, the power supply control unit 20 causes the transformer 15 to supply power to the inverter 12 , the accessory device 13 and the hybrid control unit 14 of the hybrid system 10 . Specifically, the power supply control unit 20 receives an ON signal transmitted from the refrigerator control unit 17 to determine whether or not the switch 16 has been turned ON. Since the power supply control unit 20 is provided in the hybrid control unit 14, it can determine whether or not the engine 4 is stopped by itself. The power supply control unit 20 controls power supply from the transformer 15 to the inverter 12 of the hybrid system 10 , the accessory device 13 , and the hybrid control unit 14 by controlling the relay 18 . That is, the power supply control unit 20 instructs the refrigerator control unit 17 so that the relay 18 cuts off the second power supply line A2 while the engine 4 is rotating, and after the switch 16 is operated, the engine 4 When it is determined that the refrigerator has stopped, the relay 18 instructs the refrigerator controller 17 to connect the second power supply line A2. Then, the power supply control unit 20 connects the second power supply line A2 by the relay 18, and when a predetermined time elapses, or when the remaining charge of the hybrid battery 11 becomes equal to or less than the threshold, or when the operator performs a release operation. When done, the relay 18 instructs the refrigerator controller 17 to disconnect the second power supply line A2. The release operation is, for example, an operation of turning off the switch 16 . It should be noted that the power supply control unit 20 may supply power from the transformer 15 to at least the hybrid control unit 14 , and does not necessarily have to supply power from the transformer 15 to other components of the hybrid system 10 .

Next, with reference to FIG. 2, the operation of the electric vehicle body drive system 100 according to this embodiment will be described.

FIG. 2 is a flowchart showing processing operations of the electric vehicle body drive system according to the embodiment. The processing shown in FIG. 2 is performed by the power supply control unit 20 . As shown in FIG. 2, the power supply control unit 20 first waits until the switch 16 is turned on (S1). When the power supply control unit 20 determines that the switch 16 has been turned on (S1: YES), it waits until the engine 4 stops (S2). When the power supply control unit 20 determines that the engine 4 has stopped (S2: YES), the power supply control unit 20 supplies power from the transformer 15 to the inverter 12, the accessory device 13, and the hybrid control unit 14 of the hybrid system 10 (S3). It is preferable to perform step S3 only when the engine 4 stops within a predetermined time after the switch 16 is turned on.

As described above, in the electric vehicle body drive system 100 according to the present embodiment, the hybrid battery 11 and the freezer 2 are electrically connected by the first power supply line A1, and the electric compressor 3 receives power from the hybrid battery 11. to drive. As a result, even if the engine 4 is stopped when the vehicle is stopped, the electric compressor 3 is driven by receiving power from the hybrid battery 11. Therefore, the electric compressor 3 is driven when the vehicle is stopped while suppressing fuel consumption and noise of the engine 4. be able to. Thereby, the freezing quality of the freezer 2 can be maintained even when the engine is stopped.

Further, when the engine 4 stops, the power supply control unit 20 outputs the voltage from the hybrid battery 11 to the output voltage of the low voltage battery 6 from the transformer 15, the inverter 12 of the hybrid system 10, the accessory device 13, and the hybrid control Since power is supplied to the unit 14, the consumption rate of the low-voltage battery 6 can be suppressed. As a result, the electric compressor 3 can be driven for a long time after the engine 4 is stopped.

Further, when the engine 4 is rotating, power is not supplied from the transformer 15 to the inverter 12, the accessory device 13, and the hybrid control unit 14 of the hybrid system 10, so the hybrid battery 11 when the engine 4 is rotating can be easily managed.

In addition, the second power supply line A2 is electrically connected to a third power supply line A3 that electrically connects the low voltage battery 6, the inverter 12 of the hybrid system 10, the accessory device 13, and the hybrid control unit 14. Therefore, power can be supplied from the transformer 15 to the inverter 12, the accessory device 13, and the hybrid control unit 14 of the hybrid system 10 while suppressing an increase in wiring.

In addition, since the relay 18 for disconnecting or connecting the second power supply line A2 is provided, the power supply control unit 20 controls the relay 18 so that the transformer 15, the inverter 12 of the hybrid system 10, the auxiliary equipment 13, and the hybrid The presence or absence of power supply to the control unit 14 can be easily switched.

In addition, when the engine 4 stops after the switch 16 is operated, the power supply control unit 20 supplies power from the transformer 15 to the inverter 12, the accessory device 13, and the hybrid control unit 14 of the hybrid system 10, so that the switch 16 is operated. Otherwise, it is possible to prevent power from being supplied from the transformer 15 to the inverter 12, the accessory device 13, and the hybrid control unit 14 of the hybrid system 10. FIG. As a result, wasteful consumption of the hybrid battery 11 can be suppressed.

Further, since the power supply control unit 20 is provided in the hybrid control unit 14, stoppage of the engine 4 can be detected quickly and accurately.

In addition, since the transformer 15 is provided in the freezer 2, when the freezer 2 is equipped with equipment that is driven by the same voltage as the output voltage of the low-voltage battery 6, the equipment can be powered and driven. can.

Although the preferred embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be modified or applied to other things within the scope of not changing the gist of each claim. may

For example, in the above embodiment, the mounting equipment and the electric motor are described as being the freezer 2 and the electric compressor 3. A variety of bodywork equipment and motors can be used.

In the above embodiment, the power supply control unit 20 controls the power supply from the transformer 15 to the hybrid control unit 14 by controlling the relay 18. However, the electric vehicle body drive system 101 shown in FIG. As described above, the transformer 15 is provided with a breaker circuit 21 that cuts off the output to the second power supply line A2, and the power supply control unit 20 controls the breaker circuit 21, so that from the transformer 15 to the hybrid control unit 14 may control the power supply of In this electric vehicle body drive system, the transformer 15 has the cutoff circuit 21 that cuts off the output to the second power supply line A2. Whether or not power is supplied to the hybrid control unit 14 can be easily switched.

Further, in the above embodiment, the second power supply line A2, the transformer 15, and the relay 18 have been described as being provided in the freezer 2 (body equipment). , the second power supply line A2, the transformer 15, and the relay 18 may be provided in the hybrid vehicle 1. In this case, the relay 18 can be directly controlled by the hybrid control unit 14 .

Further, in the above embodiment, the power supply control unit 20 is provided in the hybrid control unit 14, but the power supply control unit may be provided in any component of the hybrid vehicle or installation device. When the power supply control unit is provided in the installation device, the power supply control unit can determine stoppage of the engine by communicating with the hybrid control unit and the refrigerator control unit, for example.

Further, in the above embodiment, the power supply control unit 20 is described as supplying power from the transformer 15 to the hybrid control unit 14 when the engine 4 is stopped after the switch 16 is operated. Regardless, power may be supplied from the transformer 15 to the hybrid control unit 14 when the engine 4 stops. In this case, the switch may not be provided.

DESCRIPTION OF SYMBOLS 1... Hybrid vehicle, 2... Freezer (mounting device), 3... Electric compressor (electric motor), 4... Engine, 5... Motor generator, 6... Low-voltage battery, 7... Clutch, 8... Automatic transmission, 10... Hybrid System 11 Hybrid battery 12 Inverter 13 Accessory device 14 Hybrid control unit 15 Transformer 16 Switch 17 Refrigerator control unit 18 Relay 20 Power supply control unit 21 Breaking circuits 100, 101, 102...Electric vehicle body drive system, A1...First feeder line, A2...Second feeder line, A3...Third feeder line.

Claims (8)

An electric vehicle body drive for driving an electric motor of a body equipment mounted on a hybrid vehicle, which includes an engine and a motor generator as a travel drive source, and a hybrid battery that supplies power to the motor generator and is charged by the motor generator. a system,
a first power supply line electrically connected to the hybrid battery and the electric motor;
A hybrid control unit that receives power from a low-voltage battery charged by rotation of the engine and controls power feeding or charging of the hybrid battery;
a transformer electrically connected to the first power supply line to convert the voltage from the hybrid battery to the output voltage of the low voltage battery;
a second power supply line electrically connected to the transformer and the hybrid control unit;
A power supply control unit that controls power supply to the hybrid control unit,
The electric motor is driven by receiving power from the hybrid battery,
When the engine stops, the power supply control unit causes the transformer to supply power to the hybrid control unit,
The power supply control unit does not allow power to be supplied from the transformer to the hybrid control unit when the engine is rotating.
Electric bodywork drive system. The second power supply line is electrically connected to a third power supply line that electrically connects the low-voltage battery and the hybrid control unit,
The electric bodywork drive system according to claim 1. Further comprising a relay that disconnects or connects the second power supply line,
The power supply control unit controls power supply from the transformer to the hybrid control unit by controlling the relay.
The electric bodywork drive system according to claim 2. The relay is arranged on the second power supply line between a connection position between the third power supply line and the second power supply line and the transformer,
The electric vehicle body drive system according to claim 3 . further comprising a switch for driving the electric motor even after the engine has stopped;
The power supply control unit causes the transformer to supply power to the hybrid control unit when the engine stops after the switch is operated.
The electric bodywork drive system according to any one of claims 1 to 4 . The power supply control unit is provided in the hybrid control unit,
The electric bodywork drive system according to any one of claims 1 to 5 . The transformer is provided in the bodywork equipment,
The electric bodywork drive system according to any one of claims 1 to 6 . The mounting equipment is a freezer,
The electric motor is an electric compressor for cooling the freezer,
The electric bodywork drive system according to any one of claims 1 to 7 .

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