CN111447244B - One-wire communication extension communication method and device for electric vehicle - Google Patents
One-wire communication extension communication method and device for electric vehicle Download PDFInfo
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- CN111447244B CN111447244B CN202010425767.4A CN202010425767A CN111447244B CN 111447244 B CN111447244 B CN 111447244B CN 202010425767 A CN202010425767 A CN 202010425767A CN 111447244 B CN111447244 B CN 111447244B
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 239000003990 capacitor Substances 0.000 claims description 31
- 238000006243 chemical reaction Methods 0.000 claims description 21
- 230000005540 biological transmission Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000000087 stabilizing effect Effects 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/08—Protocols for interworking; Protocol conversion
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Instruments specially adapted for vehicles; Arrangement of instruments in or on vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62J—CYCLE SADDLES OR SEATS; AUXILIARY DEVICES OR ACCESSORIES SPECIALLY ADAPTED TO CYCLES AND NOT OTHERWISE PROVIDED FOR, e.g. ARTICLE CARRIERS OR CYCLE PROTECTORS
- B62J99/00—Subject matter not provided for in other groups of this subclass
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- Computer Security & Cryptography (AREA)
- Computer Networks & Wireless Communication (AREA)
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Abstract
The invention discloses a communication method and a communication device for a line communication of an electric vehicle, which are used for respectively decoding first information of the electric vehicle transmitted in a first protocol mode and second information of the electric vehicle transmitted in a second protocol mode, adding the decoded second information data to reserved bits of the decoded first information data to form fourth information, encrypting and checking the fourth information to obtain third information, wherein the third information accords with the third protocol, transmitting the third information to an electric vehicle instrument controller, and realizing the display of a plurality of data of the electric vehicle under the condition of little cost increase.
Description
Technical Field
The invention relates to the technical field of electric vehicle control, in particular to a method and a device for communication extension of a wire harness of an electric vehicle.
Background
At present, as a walking tool, an electric vehicle is popular to most people, and a linear transmission mode is adopted by an electric vehicle controller to transmit speed, gear and fault signals of the electric vehicle to a display screen for display, so that although the display requirements of part of the electric vehicle can be met, more data of the electric vehicle can not be displayed, and therefore multidirectional data are provided for a driver; the existing electric vehicle controllers are various, the cost of the controllers with more than 3 data transmission is high, the cost of the electric vehicle is increased, and the cost of the controllers with only 3 data transmission is low, but the transmission requirement for multiple data cannot be met.
Therefore, how to increase the transmission data amount on the controller with only a small amount of data transmission and expand the transmission range of the electric vehicle controller is a problem to be solved in the present day.
Disclosure of Invention
The invention aims to provide a one-wire communication extension communication method and device of an electric vehicle, which are used for converting one-wire communication protocol signals and second protocol signals by adding one-wire communication extension circuits, generating third protocol signals and sending the third protocol signals to an electric vehicle display device to increase the detection range of the electric vehicle and provide more real-time data for a driver to timely grasp the state of the electric vehicle.
The above object of the present invention is achieved by the following technical solutions:
a communication method of a wire communication extension of an electric vehicle, which is used for communicating between an electric vehicle controller and an electric vehicle instrument and transmitting electric vehicle information to the electric vehicle instrument, comprises the following steps of;
s1, receiving first information transmitted in a first protocol mode;
s2, receiving second information transmitted in a second protocol mode;
s3, converting the first information data and the second information data to obtain third information containing the first information data and the second information data;
and S4, transmitting the third information to the electric vehicle instrument.
The invention is further provided with: and after the first information and the second information are decoded, adding the second information data into reserved bits of the first information to obtain third information, wherein the third information corresponds to a third protocol.
The invention is further provided with: if the first information data includes 15 bytes, the second information includes 1 byte, and the third information includes 15 bytes; if the first information data includes 12 bytes, the second information includes 1 byte, and the third information includes 12 bytes.
The invention is further provided with: the first protocol is a line-through protocol; the second protocol is 485 protocol, or CAN protocol.
The invention is further provided with: and adding the second information data to the 9 th byte of the first information to form fourth information, and encrypting and checking the fourth information to form third information.
The invention is further provided with: and sending third information to the electric vehicle instrument at a certain frequency.
The above object of the present invention is also achieved by the following technical solutions:
a communication expansion communication device of an electric vehicle comprises a first communication module, a second communication module and a conversion module, wherein the first communication module and the second communication module are respectively connected with the conversion module, the first communication module is used for transmitting a first communication signal conforming to a first protocol mode to the conversion module, the second communication module is used for transmitting second communication information conforming to a second protocol mode to the conversion module, and the conversion module is used for converting the first communication signal and the second communication signal to form a third communication signal containing first communication signal data and second communication signal data and transmitting the third communication signal at a set frequency.
The invention is further provided with: the first communication module comprises a line communication module, and the second communication module comprises a 485 communication module or a CAN communication module.
The invention is further provided with: the conversion module comprises an MCU, a first group of interfaces of the MCU are communicated with the one-wire communication module, a second group of interfaces of the MCU are communicated with a 485 interface or a CAN interface, and a third group of interfaces transmit third communication signals.
The invention is further provided with: the MCU comprises a first group of interfaces, a second group of interfaces, a third group of interfaces and a third group of interfaces, wherein the first group of interfaces comprises a DATA1 port, the second group of interfaces comprises a DE port, the third group of interfaces comprises a DATA0 port, the DATA0 port is connected with one end of a first resistor, the other end of the first resistor is connected with one end of a second resistor, a third resistor and a first capacitor, the other end of the second resistor is connected with a power supply, the other end of the first capacitor is connected with the power supply to be grounded, and the other end of the third resistor is used as an output end PO; the DATA1 port is connected with one end of a fourth resistor, the other end of the fourth resistor is connected with one end of a fifth resistor, a sixth resistor and a second capacitor, the other end of the fifth resistor is connected with a power supply, the other end of the second capacitor is connected with the power supply ground, and the other end of the sixth resistor is used as a first input end PI for transmitting a first communication signal conforming to a first protocol mode; the DE port is used as a second input end for transmitting a second communication signal conforming to a second protocol mode.
Compared with the prior art, the invention has the beneficial technical effects that:
1. according to the communication method, the first signal data conforming to the first communication protocol and the second signal data conforming to the second communication protocol are combined to generate the third signal data conforming to the third protocol, and the third signal data is transmitted to the display instrument of the electric vehicle, so that data expansion on the basis of the controller of the electric vehicle is realized, and the display range of the electric vehicle is increased;
2. further, the data amount is expanded on the basis of not increasing the transmission bit number by adding the second signal data to the reserved bit of the first signal data;
3. further, according to the communication device, the linear expansion board is added on the electric vehicle controller, so that the expansion of the transmission data volume is realized on the basis of little cost increase, and the function of the electric vehicle is improved.
Drawings
FIG. 1 is a schematic diagram of a wired communications device according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a power supply structure of a wired-communication extension communication device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing a communication module of a communication device 485 according to an embodiment of the invention;
fig. 4 is a schematic diagram of a converting circuit of a wired-communication extension communication device according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Detailed description of the preferred embodiments
The invention relates to a one-wire communication extension communication method of an electric vehicle, which is used for communicating an electric vehicle controller with an electric vehicle instrument and transmitting electric vehicle information to the electric vehicle instrument, and comprises the following steps of;
s1, receiving first information of an electric vehicle transmitted in a first protocol mode, wherein the first information accords with the first protocol regulation;
s2, receiving second information of the electric vehicle transmitted in a second protocol mode, wherein the second information accords with the second protocol;
s3, converting the first information data and the second information data to obtain third information containing the first information data and the second information data;
and S4, transmitting the third information to the electric vehicle instrument.
Specifically, first information conforming to a first protocol and second information conforming to a second protocol are received, the first information is decoded to obtain data in the first information, the second information is decoded to obtain data in the first information, then the data in the first information and the data in the second information form third information according to a format of the first protocol, the third information conforms to a third protocol, and then the third information is sent out.
In a specific embodiment of the present application, the first information data includes 12 bytes, the second information data includes 1 byte, one byte of the second information is added to the reserved bits in the first information to form fourth information different from the first protocol and the second protocol, and the data length of the fourth information is the same as the data length of the first information due to the addition of only the reserved bits, and then the third information is obtained by encrypting and checking the third protocol information.
In another specific embodiment of the present application, the first information data includes 15 bytes, the second information data includes 1 byte, one byte of the second information is added to the reserved bit in the first information, and a third information of 15 bytes is formed, and the data length of the third information is the same as the data length of the first information because only the reserved bit data is added.
In still another specific embodiment of the present application, the first information conforms to a line-through protocol, the second information conforms to a 485 protocol, 1 byte of second information data is obtained after decoding the second information, 12 bytes or 15 bytes of first information data are obtained after decoding the first information conforming to the line-through protocol, the second information data is added to the 9 th byte of the reserved bit of the first information data to form fourth information, encryption and verification are performed on the fourth information to obtain third information, the third information is sent to the electric vehicle meter in a line-through communication mode with a period of 250 milliseconds, and at the moment, the electric vehicle meter can receive the third information conforming to the third protocol, perform corresponding decoding and display.
In yet another embodiment of the present application, the second information conforms to the CAN protocol.
The data length of the second information is less than or equal to the reserved bit number of the first information.
The second information is oil quantity information, or battery power information, or battery voltage information, or central control state information of the electric vehicle.
Second embodiment
A communication device is extended to a line of electric motor car of this application, as shown in fig. 1, including first communication module, second communication module, conversion circuit, first communication module, second communication module are connected with conversion circuit respectively.
The conversion circuit comprises an MCU, the first communication module is an electric vehicle controller, is connected with a DATA1 interface of the MCU, transmits first information comprising speed, gear and fault information of the electric vehicle to the conversion circuit in a line communication protocol mode, and decodes the first information to obtain first information DATA of 12 bytes or 15 bytes.
The second communication module is a 485 module and is connected with the DATA0 interface of the MCU, and the second information including the battery electric quantity, the battery voltage or the central control state of the electric vehicle is transmitted to the conversion circuit in a 485 communication mode, and the conversion circuit decodes the second information to obtain second information DATA with 1 byte.
The 9 th bit in the first information data is a reserved bit, the conversion circuit adds the second information data to the 9 th bit reserved bit, so that new data information is formed, the fourth information is fourth information, the fourth information comprises the first information data and the second information data, encryption and verification are carried out on the fourth information to obtain third information, the third information is transmitted to an electric vehicle instrument in a wired communication mode, and the electric vehicle instrument decodes the third information, so that corresponding display is carried out.
Detailed description of the preferred embodiments
The utility model provides a one-line of electric motor car leads to extension communication device, includes power module, 485 communication module, converting circuit.
The power supply module comprises a first filter circuit, a three-terminal voltage stabilizing circuit and a second filter circuit which are sequentially connected, wherein the first filter circuit comprises a filter diode, a filter inductor and a filter capacitor group; the positive end of the filter diode D1 is connected with a 12V power supply, and the negative end of the filter diode D1 is connected with one end of the filter inductor L1 and one end of the first filter capacitor C1; the other end of the filter inductor L1 is connected with one end of the second filter capacitor C2, one end of the third filter capacitor C3 and the input end of the three-terminal voltage stabilizing circuit; the other end of the first filter capacitor C1, the other end of the second filter capacitor C2 and the other end of the third filter capacitor C3 are grounded, wherein the second filter capacitor C2 adopts an electrolytic capacitor.
The output end of the three-terminal voltage stabilizing circuit is connected with the second filter circuit and is used as the output end of the power supply.
The second filter circuit comprises a fourth filter capacitor C4 and a fifth filter capacitor C5 which are connected in parallel, one end of the second filter circuit is connected with the output end of the three-terminal voltage stabilization, and the other end of the second filter circuit is grounded.
Three terminal voltage regulator 7805 converts the 12 voltage of the battery to a 5V voltage to power the communication device.
The 485 communication module comprises a 485 chip and a peripheral circuit thereof, as shown in fig. 3, an ESD electrostatic protection diode PSM712 is connected between an A end and a B end of the 485 chip, so as to provide protection for a 485 chip interface system and protect networked instruments and equipment from ESD, EFT and lightning surge; meanwhile, a second resistor R2 and a third resistor R3 are connected in series between the end A and the end B, one end of a seventh capacitor C7 is connected at the connection point of the series resistors R2 and R3, and the other end of the seventh capacitor C7 is grounded.
RE and DE ends of the 485 chip are connected together and grounded through a first resistor R1. RO and DI terminals are respectively used as communication terminals to communicate with MCU of the conversion circuit.
The conversion circuit comprises an MCU chip and a peripheral circuit thereof, as shown in FIG. 4, a DATA1 end of the MCU chip is connected with the input filter circuit, the input filter circuit comprises a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12 and a ninth capacitor C9, wherein the DATA1 end is connected with one end of the tenth resistor R10, the other end of the tenth resistor R10 is connected with one end of the eleventh resistor R11, the twelfth resistor R12 and the ninth capacitor C9, the other end of the eleventh resistor R11 is connected with a positive end of a power supply, the other end of the ninth capacitor C9 is grounded, and the other end of the twelfth resistor R12 is used as an input end of a line communication signal to receive the line communication signal.
The eleventh resistor R11 serves as a pull-up resistor, and the ninth capacitor C9 serves as a filter capacitor.
The DATA0 end of the MCU chip is connected with an output filter circuit, and the output filter circuit comprises a seventh resistor R7, an eighth resistor R8, a ninth resistor R9 and a tenth capacitor C10. The DATA0 end is connected to one end of the seventh resistor R7, the other end of the seventh resistor R7 is connected to one end of the eighth resistor R8, the ninth resistor R9, and the tenth capacitor C10, the other end of the eighth resistor R8 is connected to the positive power supply end, the other end of the tenth capacitor C10 is grounded, and the other end of the ninth resistor R9 is used as an output end of a wired communication extension communication, and receives the third signal.
Similarly, the eighth resistor R8 serves as a pull-up resistor, and the tenth capacitor C10 serves as a filter capacitor.
The T2 end of the MCU chip is connected with the DE end of the 485 chip; the TX end of the MCU chip is connected with the DI end of the 485 chip, the RX end of the MCU chip is connected with the RO end of the 485 chip, and the communication between the 485 chip and the MCU chip is realized.
The TDO/TMS/TDI end of the MCU chip is used for the program writing end of the MCU chip.
The implementation principle of the embodiment is as follows: the method comprises the steps that a line communication signal is input from a DATA1 end of an MCU, a 485 communication signal is input from a TX end and an RX end of the MCU, the MCU decodes the line communication signal according to a program to obtain DATA information of the line communication signal, decodes the 485 signal to obtain the DATA information of the 485 signal, adds the DATA information of the 485 signal to reserved bits of the DATA information of the line communication signal to obtain fourth information, encrypts and checks the fourth information to obtain third information, outputs the third information from a DATA0 end of the MCU, transmits the third information to an electric vehicle instrument control circuit, and displays corresponding DATA information on an electric vehicle instrument through decoding of the electric vehicle instrument control circuit.
The embodiments of the present invention are all preferred embodiments of the present invention, and are not intended to limit the scope of the present invention in this way, therefore: all equivalent changes in structure, shape and principle of the invention should be covered in the scope of protection of the invention.
Claims (8)
1. A wire-through extension communication method of an electric vehicle is characterized in that: the electric vehicle controller is communicated with the electric vehicle instrument to transmit electric vehicle information to the electric vehicle instrument, and the method comprises the following steps of;
s1, receiving first information transmitted in a first protocol mode, wherein the first information accords with a line-through protocol;
s2, receiving second information transmitted in a second protocol mode;
s3, converting the first information data and the second information data, decoding the first information to obtain first information data, decoding the second information to obtain second information data, adding the second information data to reserved bits of the first information data to form fourth information, encrypting and checking the fourth information to obtain third information, wherein the third information corresponds to a third protocol;
and S4, transmitting the third information to the electric vehicle instrument in a wired communication mode according to the set frequency, and performing corresponding decoding and displaying after receiving the third information conforming to the third protocol by the electric vehicle instrument.
2. The electric vehicle communication method of a line extension according to claim 1, wherein: if the first information data includes 15 bytes, the second information includes 1 byte, and the third information includes 15 bytes; if the first information data includes 12 bytes, the second information includes 1 byte, and the third information includes 12 bytes.
3. The electric vehicle communication method of a line extension according to claim 1, wherein: the first protocol is a line-through protocol; the second protocol is 485 protocol, or CAN protocol.
4. A method of one-wire communication extension for an electric vehicle as claimed in claim 3, wherein: and adding the second information data to the 9 th byte of the first information to form fourth information, and encrypting and checking the fourth information to form third information.
5. A lead to extension communication device of electric motor car, its characterized in that: the system comprises a first communication module, a second communication module and a conversion module, wherein the first communication module and the second communication module are respectively connected with the conversion module, the first communication module is used for transmitting a first communication signal conforming to a first protocol mode to the conversion module, the second communication module is used for transmitting a second communication signal conforming to a second protocol mode to the conversion module, the conversion module is used for decoding the first communication signal according to a program to obtain data information of the first communication signal, decoding the second communication signal to obtain the data information of the second communication signal, adding the data information of the second communication signal to a reserved bit of the data information of the second communication signal to obtain fourth information, encrypting and checking the fourth information to form a third communication signal containing the data of the first communication signal and the data of the second communication signal, transmitting the third communication signal at a set frequency, and decoding the third communication signal by an electric vehicle instrument control circuit to display corresponding data information on an electric vehicle instrument.
6. The electric vehicle communication device according to claim 5, wherein: the first communication module comprises a line communication module, and the second communication module comprises a 485 communication module or a CAN communication module.
7. The electric vehicle communication device according to claim 6, wherein: the conversion module comprises an MCU, a first group of interfaces of the MCU are communicated with the one-wire communication module, a second group of interfaces of the MCU are communicated with a 485 interface or a CAN interface, and a third group of interfaces transmit third communication signals.
8. The electric vehicle communication device according to claim 7, wherein:
the MCU comprises a first group of interfaces, a second group of interfaces, a third group of interfaces and a third group of interfaces, wherein the first group of interfaces comprises a DATA1 port, the second group of interfaces comprises a DE port, the third group of interfaces comprises a DATA0 port, the DATA0 port is connected with one end of a first resistor, the other end of the first resistor is connected with one end of a second resistor, a third resistor and a first capacitor, the other end of the second resistor is connected with a power supply, the other end of the first capacitor is connected with the power supply to be grounded, and the other end of the third resistor is used as an output end PO; the DATA1 port is connected with one end of a fourth resistor, the other end of the fourth resistor is connected with one end of a fifth resistor, a sixth resistor and a second capacitor, the other end of the fifth resistor is connected with a power supply, the other end of the second capacitor is connected with the power supply ground, and the other end of the sixth resistor is used as a first input end PI for transmitting a first communication signal conforming to a first protocol mode; the DE port is used as a second input end for transmitting a second communication signal conforming to a second protocol mode.
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