JP2020141512A - vehicle - Google Patents

Abstract

To hinder a situation in which, if a voltage sensor for detecting an output voltage of a charging device malfunctions, external charging cannot be carried out.SOLUTION: A vehicle comprises: a first voltage sensor that detects an output voltage of a charging device and is connected to a first control device; and a second voltage sensor that detects an output voltage of a solar power generation system and is connected to a second control device. The first control device recognizes a detection value of the first voltage sensor as the output voltage of the charging device when an abnormality does not occur in the first voltage sensor, and starts the second control device, inputs a detection value of the second voltage sensor by communication via the second control device, and recognizes it as the output voltage of the charging device when an abnormality occurs in the first voltage sensor.SELECTED DRAWING: Figure 2

Description

The present invention relates to a vehicle, and more particularly to a vehicle including a power storage device and a voltage sensor.

Conventionally, as a vehicle of this type, a vehicle capable of external charging that charges a battery by using electric power from an external charging device has been proposed (see, for example, Patent Document 1). This vehicle is equipped with a power receiving connector that can be coupled to the power supply connector of the external charging device, a charging relay that connects and disconnects the power receiving connector and the battery, and a voltage sensor that detects the voltage of the power supplied by the external charging device. A failure diagnosis of the charging relay is performed based on the signal from the voltage sensor. When a failure occurs in the voltage sensor of the vehicle, the voltage of the power supplied by the external charging device is received from the external charging device by communication, and the failure diagnosis of the charging relay is performed.

Japanese Unexamined Patent Publication No. 2016-101033

A vehicle that performs such external charging is equipped with a charging device that supplies power from an external power source to a power storage device via a power line, and charges so as to perform external charging on condition that the output voltage of the charging device is recognized. When controlling the device, if an error occurs in the voltage sensor that detects the output voltage of the charging device, the output voltage on the external power supply side cannot be used as the output voltage of the charging device, and external charging may not be possible. There is.

The main object of the vehicle of the present invention is to suppress the inability to execute external charging when a voltage sensor abnormality that detects the output voltage of the charging device occurs.

The vehicle of the present invention has adopted the following means in order to achieve the above-mentioned main object.

The vehicle of the present invention
Power storage device and
A charging device capable of performing external charging that supplies power from an external power source to the power storage device via a power line,
A solar power generation system capable of performing solar charging that supplies power generated by using sunlight to the power storage device via the power line, and
The first control device that controls the charging device and
A second control device that controls the solar power generation system and communicates with the first control device,
With
The first control device controls the charging device so as to execute the external charging on condition that the output voltage of the charging device is recognized.
It ’s a vehicle,
A first voltage sensor connected to the first control device while detecting the output voltage of the charging device,
A second voltage sensor that detects the output voltage of the solar power generation system and is connected to the second control device, and
With
The first control device is
When no abnormality has occurred in the first voltage sensor, the detected value of the first voltage sensor is recognized as the output voltage of the charging device.
When an abnormality occurs in the first voltage sensor, the second control device is activated, and the detected value of the second voltage sensor is input by communication via the second control device as the output voltage of the charging device. recognize,
The gist is that.

In the vehicle of the present invention, the first control device controls the charging device so as to perform external charging on condition that the output voltage of the charging device is recognized. Then, it includes a first voltage sensor that detects the output voltage of the charging device and is connected to the first control device, and a second voltage sensor that detects the output voltage of the solar power generation system and is connected to the second control device. , The first control device recognizes the detected value of the first voltage sensor as the output voltage of the charging device when the first voltage sensor has no abnormality, and when the first voltage sensor has an abnormality, the second control The device is activated, and the detected value of the second voltage sensor is input by communication via the second control device and recognized as the output voltage of the charging device. As a result, it is possible to suppress the inability to execute external charging when an abnormality occurs in the first voltage sensor. Of course, when no abnormality has occurred in the first voltage sensor, it is not necessary to start the second control device, so that the power consumption in the second control device can be suppressed.

In such a vehicle of the present invention, when the first voltage sensor returns to normal after the second control device is activated due to an abnormality in the first voltage sensor, the first control device is described. The second control device may be stopped and the detected value of the first voltage sensor may be recognized as the output voltage of the charging device. As a result, when the first voltage sensor recovers from the abnormality to normal, the power consumption in the second control device can be suppressed.

It is a block diagram which shows the outline of the structure of the electric vehicle 20 as one Example of this invention. It is a flowchart which shows an example of the processing routine executed by the main ECU 50. It is explanatory drawing which shows an example of the state when an abnormality occurs in a voltage sensor 42a during execution of AC external charging.

Next, a mode for carrying out the present invention will be described with reference to Examples.

FIG. 1 is a configuration diagram showing an outline of the configuration of an electric vehicle 20 as an embodiment of the present invention. As shown in the figure, the electric vehicle 20 of the embodiment includes a motor 32, an inverter 34, a main battery 36 as a power storage device, a system main relay SMR, a charger 40, a vehicle side connector 44, and a charging relay. It includes a CHR, a main electronic control unit (hereinafter referred to as "main ECU") 50, a solar power generation system 60, and a solar electronic control unit (hereinafter referred to as "solar ECU") 70.

The motor 32 is configured as, for example, a synchronous generator motor, and is connected to a drive shaft 26 connected to the drive wheels 22a and 22b via a differential gear 24. The inverter 34 is used for driving the motor 32 and is connected to the power line 35. The motor 32 is rotationally driven by switching control of a plurality of switching elements (not shown) of the inverter 34 by the main ECU 50.

The main battery 36 is configured as, for example, a lithium ion secondary battery having a rated voltage of 200 V or 250 V or a nickel hydrogen secondary battery, and is connected to the power line 35. A capacitor 37 is attached between the main battery 36 and the inverter 34 in the power line 35.

The system main relay SMR is provided between the main battery 36 in the power line 35 and the inverter 34 and the capacitor 37. The system main relay SMR is controlled on and off by the main ECU 50 to connect and disconnect the main battery 36 side from the inverter 34 and the capacitor 37 side.

The charger 40 is connected to the power line 35, and a vehicle-side connector 44 is attached to the charger 40. The vehicle-side connector 44 is configured to be connectable to the power supply-side connector 84 of the external power supply device 80 at a charging point such as a home or a charging station. A capacitor 42 is attached between the output terminals of the charger 40 in the power line 35.

The charger 40 mainly uses the power from the AC power supply device 82 of the external power supply device 80 when the vehicle side connector 44 and the power supply side connector 84 are connected at a charging point such as a home or a charging station. It is configured to be capable of performing AC external charging to charge the battery 36. The AC power supply device 82 is configured as an AC power source such as a household power source or an industrial power source.

The charging relay CHR is provided between the main battery 36 in the power line 35 and the charger 40 and the capacitor 42. The charging relay CHR is controlled on and off by the main ECU 50 to connect and disconnect the main battery 36 side from the charger 40 and the capacitor 42 side.

Although not shown, the main ECU 50 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port in addition to the CPU. .. Signals from various sensors are input to the main ECU 50 via input ports. The signals input to the main ECU 50 include, for example, the rotation position θm of the rotor of the motor 32 from the rotation position sensor that detects the rotation position of the rotor of the motor 32, and the voltage attached between the terminals of the main battery 36. The voltage Vmb of the main battery 36 from the sensor 36a, the current Imb of the main battery 36 from the current sensor 36b attached to the output terminal of the main battery 36, and the temperature Tmb of the main battery 36 from the temperature sensor attached to the main battery 36. Can be mentioned. Further, the voltage VL of the capacitor 37 from the voltage sensor 37a attached between the terminals of the capacitor 37 and the voltage Vchg of the capacitor 42 from the voltage sensor 42a attached between the terminals of the capacitor 42 can also be mentioned. Further, a connection detection signal from the connection detection sensor 44a, which is attached to the vehicle-side connector 44 and detects the connection between the vehicle-side connector 44 and the power supply-side connector 84, can also be mentioned. In addition, the ignition signal from the ignition switch 56, the shift position from the shift position sensor, the accelerator opening from the accelerator pedal position sensor, the brake pedal position from the brake pedal position sensor, and the vehicle speed from the vehicle speed sensor can also be mentioned. .. Further, a connection detection signal from the connection detection sensor 44a, which is attached to the vehicle-side connector 44 and detects the connection between the vehicle-side connector 44 and the power supply-side connector 84, can also be mentioned.

Various control signals are output from the main ECU 50 via the output port. Examples of the signal output from the main ECU 50 include a control signal to the inverter 34, a control signal to the system main relay SMR, a control signal to the charger 40, and a control signal to the charging relay CHR. it can. The main ECU 50 calculates the storage ratio SOCmb of the main battery 36 based on the integrated value of the current Imb of the main battery 36 from the current sensor 36b. The main ECU 50 is connected to the solar ECU 70 via a communication port.

The solar power generation system 60 includes a solar battery 61, a solar panel 62, a solar DC / DC converter 63, and a step-up DC / DC converter 64. The solar battery 61 is configured as a nickel-metal hydride secondary battery having a rated voltage of, for example, 20 V, and is connected to a power line 69. The solar panel 62 is installed on the roof of a vehicle or the like, and generates electricity using sunlight. The solar DC / DC converter 63 is connected to the solar panel 62 and the power line 69. The solar DC / DC converter 63 is controlled by the solar ECU 70 to supply the electric power generated by the solar panel 62 to the electric power line 69 (stored in the solar battery 61) with a change in voltage. The step-up DC / DC converter 64 is connected to the charger 40 side of the charging relay CHR in the power line 35 via the power line 68, and is also connected to the power line 69. The step-up DC / DC converter 64 boosts the power of the power line 69 and supplies it to the power line 68 by being controlled by the solar ECU 70. A capacitor 66 is attached between the output terminals of the step-up DC / DC converter 64 in the power line 68.

Although not shown, the solar ECU 70 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and a communication port in addition to the CPU. .. Signals from various sensors are input to the solar ECU 70 via input ports. The signals input to the solar ECU 70 include, for example, the voltage Vsb of the solar battery 61 from the voltage sensor 61a installed between the terminals of the solar battery 61, and the current sensor 61b attached to the output terminal of the solar battery 61. Examples include the current Isb of the solar battery 61 and the voltage Vsol of the capacitor 66 from the voltage sensor 66a attached between the terminals of the capacitor 66. Various control signals are output from the solar ECU 70 via the output port. Examples of the signal output from the solar ECU 70 include a control signal to the solar DC / DC converter 63 and a control signal to the step-up DC / DC converter 64. The solar ECU 70 calculates the storage ratio SOCsb of the solar battery 61 based on the integrated value of the current Isb of the solar battery 61 from the current sensor 61b. As described above, the solar ECU 70 is connected to the main ECU 50 via a communication port.

In the electric vehicle 20 of the embodiment configured in this way, when the ignition switch 56 is turned on by the driver, the main ECU 50 turns on the system main relay SMR and makes it ready to run (makes it possible to drive). After that, when the ignition switch 56 is turned off, the system main relay SMR is turned off and ready-off.

Further, in the electric vehicle 20 of the embodiment, when the ignition switch 56 is off (system stopped) at a charging point such as a home or a charging station, the main ECU 50 is connected to the power supply side connector 84 when the vehicle side connector 44 is connected. , The condition that the output voltage of the charger 40 is recognized so that the main battery 36 is charged by turning on the charging relay CHR and using the power from the AC power supply device 82 of the external power supply device 80. AC external charging that controls the charger 40 is executed. Then, when a charge stop switch (not shown) is operated, or when the main battery 36 is fully charged from the main ECU 50 (the voltage Vmb of the main battery 36 and the storage ratio SOCmb have reached the full charge voltage Vmbf1 and the full charge ratio SOCmbf1). When a signal indicating that effect is received, the control of the charger 40 is stopped (finished), and the charging relay CHR is turned off.

Further, in the electric vehicle 20 of the embodiment, the solar ECU 70 performs solar charging when the ignition switch 56 is off and the execution condition of solar charging for charging the main battery 36 using the power from the solar power generation system 60 is satisfied. Is determined to be required to be executed, and a request to turn on the charging relay CHR is transmitted to the main ECU 50. Upon receiving this request, the main ECU 50 turns on the charging relay CHR. When the solar ECU 70 confirms that the charging relay CHR is on by the voltage sensor 66a or by communicating with the main ECU 50, the solar ECU 70 controls the step-up DC / DC converter 64 so that the solar charging is executed. Then, when the solar ECU 70 satisfies the stop condition based on the storage ratio SOCsb of the solar battery 61, or when the main ECU 50 receives information indicating that the main battery 36 is fully charged, the step-up DC / DC converter 64 To stop driving and finish the execution of solar charging. When the main ECU 50 confirms that the execution of solar charging is completed by the current sensor 36b or by communication with the solar ECU 70, the main ECU 50 turns off the charging relay CHR.

Next, the operation of the electric vehicle 20 of the embodiment configured in this way, particularly the operation when executing AC external charging will be described. In the embodiment, the AC external charging is performed on the condition that the main ECU 50 recognizes the output voltage of the charger 40. FIG. 2 is a flowchart showing an example of a processing routine executed by the main ECU 50. This routine is executed when the vehicle side connector 44 is connected to the power supply side connector 84 and the main ECU 50 turns on the charging relay CHR when the system is stopped.

When the processing routine of FIG. 2 is executed, the main ECU 50 first inputs the voltage Vchg of the capacitor 42 (step S100). Here, as the voltage Vchg of the capacitor 42, the value detected by the voltage sensor 42a is input. When the voltage Vchg is input in this way, the input voltage Vchg is recognized as the output voltage of the charger 40 (step S110).

While recognizing the output voltage of the charger 40 in this way, it is determined whether or not the charging stop condition is satisfied (step S120). This determination is performed, for example, by operating a charge stop switch (not shown) or determining that the main battery 36 is fully charged. When the charging stop condition is not satisfied, it is determined whether or not an abnormality has occurred in the voltage sensor 42a (step S130). This determination is performed, for example, by determining whether or not the signal from the voltage sensor 42a is interrupted for a predetermined time. When no abnormality has occurred in the voltage sensor 42a, the process returns to step S100. In this way, steps S100 to S130 are repeatedly executed, and when the charging stop condition is satisfied in step S120, AC external charging is stopped (step S200), and this routine is terminated. When an abnormality occurs in the voltage sensor 42a in step S130, the solar ECU 70 is started (step S140). In the embodiment, the solar ECU 70 is basically stopped except when it is in use.

When the solar ECU 70 is activated in step S140, the voltage Vsol of the capacitor 66 is input (step S150). Here, as the voltage Vsol of the capacitor 66, the value detected by the voltage sensor 66a is input from the solar ECU 70 by communication. When the voltage Vsol is input in this way, the input voltage Vsol is recognized as the output voltage of the charger 40 (step S160). As a result, even when an abnormality occurs in the voltage sensor 42a, the output voltage of the charger 40 can be recognized, and it is possible to suppress the AC external charging from stopping. In reality, it takes some time to start the solar ECU 70 after detecting the abnormality of the voltage sensor 42a and to start the input of the voltage Vsol of the capacitor 66 by communication from the solar ECU 70. It is necessary to take measures so as not to interrupt the charging relay CHR.

While recognizing the output voltage of the charger 40 in this way, it is determined whether or not the voltage sensor 42a has recovered normally from the abnormality (step S170). This determination can be performed, for example, by determining whether or not the signal input from the voltage sensor 42a has been restored. When the voltage sensor 42a has not recovered normally from the abnormality, it is determined whether or not the charging stop condition is satisfied (step S180). If the charging stop condition is not satisfied, the process returns to step S150. In this way, steps S150 to S180 are repeatedly executed, and when the voltage sensor 42a returns to normal from the abnormality in step 170, the solar ECU 70 is stopped (step S190), and the process returns to step S100. As a result, the power consumption of the solar ECU 70 can be suppressed. If the charging stop condition is satisfied in step S180 before the voltage sensor 42a recovers normally from the abnormality, AC external charging is stopped (step S200), and this routine is terminated.

FIG. 3 is an explanatory diagram showing an example of a state when an abnormality occurs in the voltage sensor 42a during execution of AC external charging. In the figure, the solid line shows an example, and the broken line shows a comparative example. In the comparative example, when the voltage sensor 42a is abnormal, the solar ECU 70 is not started, that is, the voltage Vsol of the capacitor 66 detected by the voltage sensor 66a is not input to the main ECU 50. As shown in the figure, AC external charging is executed with the charging relay CHR connected (time t11). Since the voltage sensor 42a can be used at this time, the main ECU 50 recognizes the voltage Vchg of the capacitor 42 detected by the voltage sensor 42a as the output voltage of the charger 40, and continues the AC external charging. If an abnormality occurs in the voltage sensor 42a during the execution of this AC external charging (time t12), in the comparative example, as shown by the broken line in the figure, the main ECU 50 cannot recognize the output voltage of the charger 40, so that the charging is performed. The relay CHR is switched to shut off to end AC external charging (time t13). On the other hand, in the embodiment, as shown by the solid line in the figure, the solar ECU 70 is started, the voltage Vsol of the capacitor 66 detected by the voltage sensor 66a is input to the main ECU 50, and the main ECU 50 charges the voltage Vsol of the capacitor 66. Since it is recognized as the output voltage of the device 40, AC external charging is continued (time t12). As a result, it is possible to prevent the AC external charging from stopping when an abnormality occurs in the voltage sensor 42a. In this way, when the detection value of the voltage sensor 66a is input to the main ECU 50 and the AC external charging is continued, when the voltage sensor 42a returns to normal from the abnormality (time t14), the solar ECU 70 is stopped and the voltage sensor 42a causes the voltage sensor 42a to stop. The detected voltage Vchg of the capacitor 42 is input to the main ECU 50, and the main ECU 50 recognizes the voltage Vchg as the output voltage of the charger 40 and continues AC external charging. As a result, when the voltage sensor 42a returns to normal from the abnormality, the power consumption in the solar ECU 70 can be suppressed.

In the electric vehicle 20 of the embodiment described above, the output voltage of the charger 40 is detected and the voltage sensor 42a connected to the main ECU 50 and the output voltage of the solar power generation system 60 are detected and the voltage connected to the solar ECU 70. The main ECU 50 includes the sensor 66a, recognizes the detected value of the voltage sensor 42a as the output voltage of the charger 40 when the voltage sensor 42a is not abnormal, and when the voltage sensor 42a is abnormal, the solar ECU 70 Is activated, and the detected value of the voltage sensor 66a is input via communication via the solar ECU 70 and recognized as the output voltage of the charger 40. As a result, it is possible to prevent the voltage sensor 42a from being unable to perform external charging when an abnormality occurs.

In the electric vehicle 20 of the embodiment, when the detection value of the voltage sensor 66a is input from the solar ECU 70 to the main ECU 50 by communication and the AC external charging is continued, when the voltage sensor 42a recovers normally from the abnormality, the solar ECU 70 Is stopped, and the voltage of the capacitor 42 detected by the voltage sensor 42a is input to the main ECU 50. However, even if the voltage sensor 42 recovers normally from the abnormality, the detected value of the voltage sensor 66a may be input from the solar ECU 70 to the main ECU 50 by communication.

In the electric vehicle 20 of the embodiment, the motor 32 is connected to the drive shaft 26 connected to the drive wheels 22a and 22b, and the electric vehicle 20 is configured to exchange power between the motor 32 and the main battery 36. However, in addition to connecting the motor to the drive shaft connected to the drive wheels, the engine and generator are connected to the drive shaft via planetary gears, and power is exchanged between the motor and generator and the main battery. It may be configured as a hybrid vehicle. Further, as a configuration of a hybrid vehicle in which a motor is connected to a drive shaft connected to a drive wheel via a transmission, an engine is connected to this motor via a clutch, and electric power is exchanged between the motor and the main battery. May be good. Furthermore, in addition to connecting the motor to the drive shaft connected to the drive wheels, a generator is connected to the output shaft of the engine, and power is exchanged between the motor and the generator and the main battery, so-called series hybrid vehicles. It may be configured as.

In the electric vehicle 20 of the embodiment, the main battery 36 is used as the power storage device, but a capacitor may be used.

The correspondence between the main elements of the examples and the main elements of the invention described in the column of means for solving the problem will be described. In the embodiment, the main battery 36 corresponds to the "power storage device", the charger 40 corresponds to the "charging device", the solar power generation system 60 corresponds to the "solar power generation system", and the main ECU 50 corresponds to the "first control device". The solar ECU 70 corresponds to the "second control device", the voltage sensor 42a corresponds to the "first voltage sensor", and the voltage sensor 66a corresponds to the "second voltage sensor".

As for the correspondence between the main elements of the examples and the main elements of the invention described in the column of means for solving the problem, the invention described in the column of means for solving the problem in the examples is carried out. Since it is an example for specifically explaining the form for solving the problem, the elements of the invention described in the column of means for solving the problem are not limited. That is, the interpretation of the invention described in the column of means for solving the problem should be performed based on the description in the column, and the examples are the inventions described in the column of means for solving the problem. It is just a concrete example.

Although the embodiments for carrying out the present invention have been described above with reference to Examples, the present invention is not limited to these Examples, and various embodiments are used without departing from the gist of the present invention. Of course, it can be done.

The present invention can be used in the vehicle manufacturing industry and the like.

20 electric vehicles, 22a, 22b drive wheels, 24 differential gears, 26 drive shafts, 32 motors, 34 inverters, 35, 68, 69 power lines, 36 main batteries, 36a, 37a, 42a, 61a, 66a voltage sensors, 36b, 61b current sensor, 37,42,66 capacitor, 40 charger, 44 vehicle side connector, 44a connection detection sensor, 50 main electronic control unit (main ECU), 56 ignition switch, 60 solar power generation system, 61 solar battery, 62 solar Panel, 63 Solar DC / DC converter, 64 Boost DC / DC converter, 70 Solar electronic control unit (solar ECU), 80 External power supply, 84 Power supply side connector, 82 AC power supply, CHR charging relay, SMR system Main relay.

Claims (1)

Power storage device and
A charging device capable of performing external charging that supplies power from an external power source to the power storage device via a power line,
A solar power generation system capable of performing solar charging that supplies power generated by using sunlight to the power storage device via the power line, and
The first control device that controls the charging device and
A second control device that controls the solar power generation system and communicates with the first control device,
With
The first control device controls the charging device so as to execute the external charging on condition that the output voltage of the charging device is recognized.
It ’s a vehicle,
A first voltage sensor connected to the first control device while detecting the output voltage of the charging device,
A second voltage sensor that detects the output voltage of the solar power generation system and is connected to the second control device, and
With
The first control device is
When no abnormality has occurred in the first voltage sensor, the detected value of the first voltage sensor is recognized as the output voltage of the charging device.
When an abnormality occurs in the first voltage sensor, the second control device is activated, and the detected value of the second voltage sensor is input by communication via the second control device as the output voltage of the charging device. recognize,
vehicle.

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