JPH06245325A - Communication control system for electric automobile - Google Patents

Abstract

PURPOSE:To provide a communication control system for electric automobile utilizing the charging path of battery in which charging operation of battery is simplified. CONSTITUTION:An electric automobile 1 comprises a local area network and a communication unit 5 high frequency coupled through capacitors 15, 16 with the charging wiring 4 for a battery 3, whereas a charging power supply section 2 comprises a communication unit 7 high frequency coupled through capacitors 12, 13 with a charging wiring 6. The battery 3 in the electric automobile 1 is charged by the charging section 10 in the charging power supply section 2 when connectors 8, 9 are connected. On the other hand, high frequency signals are communicated between the communication units 5 and 7 through the charging wires 4, 6 and the connectors 8, 9. Charging information, e.g. type, voltage, etc., of the battery 3, is transmitted from the communication unit 5 to the communication unit 7 which controls the charging section 10 based on the charging information thus charging the battery 3 automatically under optimal conditions.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control system for an electric vehicle, which communicates using a charging path of a battery of the electric vehicle. Since electric vehicles have low pollution, it is desired to expand their use. Correspondingly,
It is necessary to be able to charge a battery as a power source of an electric vehicle easily everywhere like a gas station. In that case, since the type and voltage of the battery of the electric vehicle are not standardized, the battery is identified and charged, and there is a demand for simplification of the operation in such a case.

[0002]

2. Description of the Related Art Electric vehicles have already been developed in various configurations, but they are all equipped with a battery as a power source. After charging the battery, the battery is supplied with electric power to a motor to run. It is a thing. The battery charging device is installed at a charging station corresponding to a gas station or the like, and is connected to the automobile battery through a large outlet or the like. The charging device uses a commercial AC power supply voltage of 100V or 200V, In general, a transformer is used to step up or step down the voltage corresponding to the voltage of the battery, rectify the voltage with a relatively large capacity rectifier, and supply the voltage to the battery. Various types of batteries are known, such as nickel-hydrogen batteries, lithium-ion batteries, nickel-cadmium batteries, etc., and their charging characteristics differ, and the voltage when used as a power source for electric vehicles differs depending on the manufacturer. Therefore, charging is started after the charging voltage, the charging current, etc. are set according to the type of the battery and the like.

[0003]

As described above, the charging of the battery of the electric vehicle according to the related art is performed by checking the type and voltage of the battery and then charging with the charging characteristic corresponding thereto. The voltage of is different for each manufacturer, for example, about 50V to 100V. Therefore, it is necessary to avoid misidentification of the battery type, voltage, etc. from the viewpoint of danger prevention.
It is necessary to carefully set the settings before starting charging, and charging will be done at a charging station where an operator with specialized knowledge is resident. From this point as well, there is a problem in the spread of electric vehicles.

In addition, a local area network (LAN) is provided in the electric vehicle to transfer control information for controlling various parts in the vehicle and detection information from a speed detector or the like to simplify wiring in the vehicle. Is known and such L
It is conceivable that data communication is performed between the AN and the charging power supply unit side to transmit / receive battery charging information and the like. In that case, two types of connectors, that is, a connector for charging and a connector for communication, are provided, but it is conceivable to mechanically integrate these connectors and simultaneously insert and remove them. However, there is a drawback that the connector becomes large and inconvenient to handle. An object of the present invention is to make communication through a charging connector to simplify a charging operation of a battery of an electric vehicle.

[0005]

A communication control system for an electric vehicle according to the present invention will be described with reference to FIG. 1. Electric power is supplied to an electric vehicle 1 and a battery 3 as a power source of the electric vehicle 1. In the communication control system of an electric vehicle that communicates with a charging power supply unit 2, the electric vehicle 1 has a communication device 5 that is connected to a charging wiring 4 of a battery 3 by capacitors 15 and 16 at a high frequency. , The charging power supply unit 2 connects the charging wiring 6 of the battery 3 with the capacitor 12,
13 has a communication device 7 that is high-frequency coupled by means of 13 or the like, and connects between a connector 8 connected to the charging wiring 4 of the electric vehicle 1 and a connector 9 connected to the charging wiring 6 of the charging power supply unit 2, The battery 3 is charged from the charging power supply unit 2 and between the communication device 5 of the electric vehicle 1 and the communication device 7 of the charging power supply unit 2 via the charging wirings 4 and 6 and the connectors 8 and 9. The charging information and the like are transmitted and received by a high frequency signal.

Further, the electric vehicle 1 is provided with a local area network that connects a controlled unit, a detecting unit, and the like, which are dispersedly arranged in the vehicle, and a communication device 5, and a connector 8 of the electric vehicle 1 is provided.
And the connector 9 of the charging power supply unit 2 to charge the battery 3 of the electric vehicle 1, between the communication device 5 of the electric vehicle 1 and the communication device 7 of the charging power supply unit 2,
Communication is performed by a high frequency signal via the charging wirings 4 and 6 and the connectors 8 and 9.

[0007]

Operation: The connector 8 and the charging power supply unit 2 of the electric vehicle 1
, And the battery 3 of the electric vehicle 1 is charged from the charging power supply unit 2. At that time, the communication device 5 of the electric vehicle 1 modulates the charging information such as the charging characteristic according to the voltage and the type of the battery 3 into a high frequency signal and transmits the high frequency signal. This high-frequency signal is transmitted via the charging wirings 4 and 6 and the connectors 8 and 9, and is received and identified by the communication device 7 of the charging power supply unit 2 and then the charging power supply unit 2 to the charging unit 10.
Since the charging voltage and the charging current can be set to, the battery 3 can be automatically charged with the optimum charging characteristics. Further, choke coils 11 and 14 are provided so that communication can be performed by a high frequency signal even when the internal impedance between the battery 3 and the charging unit 10 is low.

Further, between the communication device 5 connected to the local area network (LAN) in the electric vehicle 1 and the communication device 7 of the charging power supply unit 2, the charging wirings 4 and 6 and the connectors 8 and 9 are provided. Communication is performed by a high frequency signal via the. As a result, the type information of the battery 3, the charge state information, etc.
Alternatively, the status information of each part of the electric vehicle 1 is collected by the communication device 7 of the charging power supply part 2 and transferred to a host computer in a processor or the like in the communication device 7 or via a host network, The host computer can perform determination processing and the like, and the result can be transmitted from the communication device 7 to the communication device 5 of the electric vehicle 1 and displayed on a display device or the like connected to the local area network.

[0009]

EXAMPLE FIG. 2 is an explanatory view of an example of the present invention.
Is an electric vehicle, 32 is a charging power supply unit, 33 is a battery as a power source of the electric vehicle 31, 34 is charging wiring, and 35 is a charging wire.
Is a communication device, 36 is a charging wire, 37 is a communication device, 3
Reference numerals 8 and 39 are connectors. The electric vehicle 31 may have various configurations, and a local area network (LAN) including a coaxial cable or a twisted pair cable for transmitting an electric signal or an optical fiber for transmitting an optical signal is provided inside the electric vehicle 31. ) 41. Further, the mounting position of the battery 33 is in the rear trunk for convenience of explanation, but it is selected in consideration of the balance of each part of the electric vehicle 31.

Further, the LAN 41 is connected with a communication device 35, a display device 42, switches 43 and 45, an operation input unit 48, various detectors 49, a drive control unit for various motors and the like.
When the LAN 41 is composed of an optical fiber, each unit has a function of electro-optical conversion and a function of photoelectric conversion. Further, for example, a switch 43 connected to the LAN 41 controls the lighting of the head lamp 44, and a switch 45 controls the lighting of the tail lamp 46. Such control can be performed, for example, by control by the processor of the communication device 35 according to an input from the touch panel using the display surface of the display device 42 or the operation input unit 48. In addition, an operation switch or the like may be arranged around the handle 47 to perform an input for controlling each part.
Further, the communication device 35 is connected to the charging wiring 34 by high frequency coupling such as a capacitor. A motor for controlling the electric vehicle 31 to be driven by electric power supplied from the battery 33 and its control portion are not shown.

The charging power supply unit 32 has a charging unit 40 and a communication device 37, and the charging unit 40 rectifies external power such as a commercial AC power source and outputs the DC power output unit 5 such as an inverter.
1 and a choke coil 52, and the output voltage and output current of the DC output unit 51 are controlled by the charging control unit 53. Further, the communication device 37 has a power line carrier signal processing unit 54 and a communication control unit 55, and has a charging wire 36 and a capacitor 5.
6,57 are connected. The power line carrier signal processing unit 54 includes a bandpass filter having a frequency of a high frequency signal as a center frequency, a modulation / demodulation unit for modulating transmission information and demodulation of reception information, and an encoding / decoding unit.

The communication device 35 of the electric vehicle 31 includes a processor, a memory and the like, and includes the type of the battery 33, the voltage,
The charging information such as charging characteristics is stored in the memory. When the connector 39 of the charging power supply unit 32 is inserted into the connector 38 of the electric vehicle 31 as shown by the chain line arrow and connected, the connectors 38, 39 are connected. The communication device 3 is automatically operated by a detection signal of the connection between the communication devices or by a manual operation input.
5 reads out and stores the stored charging information of the battery 33. That is, the charging information having a plurality of bits is modulated by a high frequency signal and the charging wiring 3 is connected via the capacitor.
Send to 4. The choke coil 52 is for blocking high frequency signals and is for maintaining the transmission / reception level of high frequency signals at a predetermined value even when the impedance of the DC output unit 51 is low.

The high frequency signal transmitted from the communication device 35 propagates through the charging wiring 34, the connectors 38 and 39, and the charging wiring 36, and the power line carrier signal processing section 54 of the communication device 37 includes a capacitor 56, A high frequency signal is received via 57, a noise component is removed by a band pass filter or the like and demodulated, and charging information is added to the charging control unit 53.
The charging control unit 53 sets and controls the output voltage and the output current of the DC output unit 51 according to the charging information, and the DC output unit 5
Start 1. Thereby, the DC voltage from the DC output unit 51 is applied to the battery 33 to charge the battery 33.

Further, the voltage, temperature, etc. of the battery 33 being charged are detected by a detector (not shown), and detection information is transmitted from the communication device 35 at regular time intervals or at a change time point. The communication device 37 of the charging power supply unit 32 receives and identifies this detection information and transfers it to the charging control unit 53, so that the charging control unit 53 controls the DC output unit 51 to control the charging current and terminate the charging. Etc. are controlled. For example, in the case of a nickel-hydrogen battery, the change in the voltage of the battery 33 is monitored, and when the change in the voltage that rises with the progress of charging disappears, it is determined that the charging is completed and the operation of the DC output unit 51 is stopped. You can In the case of a nickel-cadmium battery, it is possible to stop the operation of the DC output unit 51 by determining that the charging is completed when the voltage that rises with the progress of charging tends to decrease. Alternatively, the operation of the DC output unit 51 can be stopped by determining that the charging is completed when the time set by the timer has elapsed.

FIG. 3 is an explanatory view of a main part of an electric vehicle according to an embodiment of the present invention. The same reference numerals as those in FIG.
Is a microprocessor, 61 is a memory, 62 is a power line carrier signal processing unit, 63 is a modulation / demodulation unit, 64 is a transmission / reception unit, and 65 is
Is a bandpass filter, 66 and 67 are capacitors, 68
Is a choke coil.

To the LAN 41 of the electric vehicle, for example, a communication device 35 is connected together with a display device 42, switches 43 and 45, an operation input section 48, a detector 49 and the like. For example, the lighting of the head lamp 44 is controlled by controlling the switch 43, and the lighting of the tail lamp 46 is controlled by controlling the switch 45. Further, when the room temperature is detected by the detector 49, the temperature detection information is transferred to the microprocessor 60 and a cooler or the like (not shown) is controlled. The motor of the wiper and the like can also be controlled via the LAN 41. The drive control of the electric motor for the electric vehicle (not shown) can be performed directly or via the LAN 41.

The memory 61 stores charging information such as the type and voltage of the battery 33, and the storage portion of this charging information may be a ROM (Read Only Memory). In addition, the display device 42 can display the speed of the electric vehicle, the voltage of the battery 33, or the like, or the map of the navigation system, the current position, or the like, and has a touch panel configuration for performing various inputs. You can also do it.

The microprocessor 60 processes the input information from the operation input unit 48 or the like received via the LAN 41 and the detection information from the detector 49 or the like, forms control signals for each unit according to the processing result, and connects the LAN 41 to the LAN 41. Control signals are sent via. It also controls the charging supply unit 32 and the like to communicate with the outside.

Further, as described above, when the connectors 38 and 39 are connected to charge the battery 33, the microprocessor 60 automatically or manually operates the memory 60.
The charging information stored in 1 is read out, modulated by the high-frequency signal in addition to the modulation / demodulation unit 63, and transmitted from the transmission / reception unit 64 via the bandpass filter 65. This high frequency signal is sent to the charging wiring 34 via the capacitors 66 and 67. At that time, the choke coil 68, like the choke coil 52 of the charging unit 40 of the charging power supply unit 32,
It is for blocking high frequency signals and is for maintaining the transmission / reception level of high frequency signals at a predetermined value even when the impedance of the battery 33 is low.

A transmission / reception signal between the communication device 35 of the electric vehicle 31 and the communication device 37 of the charging power supply section 32 modulates a high frequency signal with transmission information having a plurality of bits and is already known. Various modulation methods can be adopted. And, for example, JP-A-50-2525
In order to avoid a transmission error caused by not using a dedicated data transmission line, the receiving side performs a majority decision on the received data a plurality of times by performing the repetitive transmission of the inversion continuous transmission method disclosed in Japanese Patent No. 5 publication. It is possible to adopt a method of receiving processing by logic. In this embodiment, the high frequency signal modulated on the direct current is superimposed, and the error rate can be reduced as compared with the case where it is superimposed on the alternating current.

Further, the microprocessor 60 can collect the status information of each part or the information of the test result and can send an alarm signal when an abnormal condition is detected. The collected status information and the test result information can be stored in a memory. 6
1 and the collected information is read from the memory 61 when the battery 33 is charged, and under the control of the microprocessor 60, the charging wirings 34 and 36 and the connector 3 are connected.
The communication device 3 on the charging power supply unit 32 side via
7, processed by the communication control unit 55 composed of a microprocessor or the like of the communication device 37, or by a host computer transferred via a host network,
Information such as deterioration progress status determination and component replacement instructions is transmitted to the communication device 35 of the electric vehicle 31, and in the electric vehicle 31, for example, the received information is displayed on the display device 42 to notify the driver. be able to. Alternatively, the latest road information can be transmitted from the charging power supply unit 32 side and the road information can be displayed on the display device 42 of the electric vehicle 31.

[0022]

As described above, according to the present invention, the electric vehicle 1 has the communication device 5 which is connected to the charging wiring 4 of the power source battery 3 by a high frequency by a capacitor or the like, and the charging power supply unit 2 is provided. Has a communication device 7 that is high-frequency coupled to the charging wiring 6 of the battery 3, and connects the connectors 8 and 9 to charge the battery 3 of the electric vehicle 1 from the charging power supply unit 2 and the type of the battery 3 When charging information such as voltage and voltage is sent from the communication device 5 to the charging wiring 4 as a high frequency signal, the communication device 7 of the charging power supply unit 2 can receive and identify the charging information by the high frequency signal via the charging wiring 6. Therefore, the charging unit 10 can be controlled so that the battery 3 has the optimum charging condition. That is, by simply connecting the charging connectors 8 and 9 without providing a communication connector, the battery 3 of the electric vehicle 1
Since the charging condition can be set automatically to charge the battery, the charging operation becomes easy. Therefore, it becomes possible to install the charging power supply unit 2 in a place where a professional engineer does not reside, and there is an advantage that it can contribute to the spread of the electric vehicle 1.

A LAN (local area network) is provided in order to simplify the wiring inside the electric vehicle 1, and the communication device 5 is connected to this LAN. When the battery 3 is charged, the communication device 5 and charging power are charged. Since it is possible to communicate with the communication device 7 on the side of the supply unit 2 and to transmit and receive information between the LAN and the outside, perform automatic diagnosis of the electric vehicle 1 when the battery 3 is charged. You can also Therefore, there is an advantage that the reliability of the electric vehicle 1 can be improved.

[Brief description of drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is an explanatory diagram of an example of the present invention.

FIG. 3 is an explanatory diagram of a main part of the electric vehicle according to the embodiment of the present invention.

[Explanation of symbols]

 1 Electric Vehicle 2 Charging Power Supply Unit 3 Battery 4 Charging Wiring 5 Communication Device 6 Charging Wiring 7 Communication Device 8 Connector 9 Connector 10 Charging Unit

Claims (2)

[Claims] 1. Communication of an electric vehicle for performing communication between an electric vehicle (1) and a charging power supply unit (2) for supplying charging power to a battery (3) of a power source of the electric vehicle (1). In the control method, the electric vehicle (1) has a communication device (5) that is high-frequency coupled to the charging wiring (4) of the battery (3),
The charging power supply unit (2) has a communication device (7) that is high-frequency coupled to a charging wire (6) of the battery (3), and the charging wire (4) of the electric vehicle (1) is connected to the charging wire (4). By connecting the connected connector (8) and the connector (9) connected to the charging wiring (6) of the charging power supply unit (2), the charging power supply unit (2) connects the battery ( 3), and charging wires (4), () between the communication device (5) of the electric vehicle (1) and the communication device (7) of the charging power supply unit (2). A communication control system for an electric vehicle, characterized in that charging information and the like are transmitted and received by a high frequency signal via 6) and the connectors (8) and (9). 2. The electric vehicle (1) includes a local area network connecting a controlled unit and a detection unit distributed in the vehicle and the communication device (5), and the electric vehicle (1) includes: When the connector (8) and the connector (9) of the charging power supply unit (2) are connected to charge the battery (3) of the electric vehicle (1),
Between the communication device (5) of the electric vehicle (1) and the communication device (7) of the charging power supply unit (2), the charging wirings (4) and (6) and the connector. (8),
2. The communication control system for an electric vehicle according to claim 1, wherein communication is performed by a high frequency signal via (9).