CN112187372A - Vehicle-end signal transmitting and receiving device and method and communication system - Google Patents
Vehicle-end signal transmitting and receiving device and method and communication system Download PDFInfo
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Abstract
The invention discloses a vehicle-end signal transmitting and receiving device and method and a communication system. Wherein car end signal emission device includes: the ultrasonic wave generator comprises a signal acquisition module, a pulse generation module, a coding module and an ultrasonic wave transmitting module; the signal acquisition module is used for acquiring vehicle-end signals and transmitting the vehicle-end signals to the coding module; the encoding module is used for receiving the vehicle-end signal and outputting a communication code corresponding to the vehicle-end signal to the pulse generating module; the pulse generating module is used for receiving the communication code and outputting a pulse signal corresponding to the communication code to the ultrasonic transmitting module; the ultrasonic wave transmitting module is used for receiving the pulse signal, converting the pulse signal into an ultrasonic wave signal and transmitting the ultrasonic wave signal. The vehicle-end signal is transmitted in an ultrasonic mode, so that the vehicle-end signal transmission device has good anti-interference performance, is not easy to generate signal transmission abnormity due to the change of an external environment, and is more reliable in vehicle-end signal transmission.
Description
Technical Field
The invention belongs to the field of communication, and particularly relates to a vehicle-end signal transmitting and receiving device and method and a communication system.
Background
Electric vehicles are being widely used as one of new energy vehicles. The battery provides power for the electric motor car, and at present, the electric motor car can roughly be divided into two kinds according to the difference of battery charging mode: one is self-charging, i.e. charging is directly plugged in the vehicle; and the other mode is that the vehicle is replaced by a special battery replacement station, namely the battery replacement station provides a service for replacing the vehicle with the battery, and the battery which is short of electricity is taken down from the vehicle firstly, and then the battery which is full of electricity is arranged for the vehicle. For the second kind, in the power exchanging process of the power exchanging station, some signal interaction is needed between the power exchanging terminal and the vehicle, wherein the interaction mode mainly depends on short-distance radio wave transmission, but the radio wave transmission system is complex and the cost is high.
Disclosure of Invention
The invention aims to overcome the defects of complex system and high cost caused by transmitting interactive signals by means of short-distance radio waves in the power conversion process in the prior art, and provides a vehicle-end signal transmitting and receiving device and method and a communication system for replacing radio wave transmission.
The invention solves the technical problems through the following technical scheme:
a vehicle-end signal transmitting device, comprising: the ultrasonic generator comprises a signal acquisition module, a pulse generation module, a coding module and an ultrasonic emission module, wherein the signal acquisition module is connected with the coding module, the coding module is also connected with the pulse generation module, and the pulse generation module is also connected with the ultrasonic generation module;
the signal acquisition module is used for acquiring vehicle-end signals and transmitting the vehicle-end signals to the coding module;
the encoding module is used for receiving the vehicle-end signal and outputting a communication code corresponding to the vehicle-end signal to the pulse generating module;
the pulse generating module is used for receiving the communication code and outputting a pulse signal corresponding to the communication code to the ultrasonic transmitting module;
the ultrasonic wave transmitting module is used for receiving the pulse signal, converting the pulse signal into an ultrasonic wave signal and transmitting the ultrasonic wave signal.
Preferably, the communication code includes: the vehicle-end signal transmitting device comprises a guide code, an equipment code, a data identification code, a data inverse code and an end code, wherein the guide code represents the beginning of one frame of data, the end code represents the end of one frame of data, the equipment code represents the code of the vehicle-end signal transmitting device, the data identification code represents the data type of a vehicle-end signal, the data code represents the signal content, and the data inverse code is that the data code is inverted according to the position.
Preferably, the pilot code, the device code, the data identification code, the data complement code, and the end code are all composed of logic 0 and logic 1, an ultrasonic waveform representing logic 0 in the ultrasonic signal includes an ultrasonic carrier wave of a first frequency of a first duration and a carrier-free wave of a second duration, an ultrasonic waveform representing logic 1 in the ultrasonic signal includes an ultrasonic carrier wave of a first frequency of a third duration and a carrier-free wave of a fourth duration, the first duration is the same as the third duration and the second duration is different from the fourth duration, or the first duration is different from the third duration and the second duration is the same as the fourth duration.
Preferably, the vehicle-end signal transmitting device is mounted on a vehicle.
A vehicle-end signal receiving device comprising: the ultrasonic wave receiving module is connected with the signal processing module, and the signal processing module is also connected with the decoding module;
the ultrasonic receiving module is used for receiving ultrasonic signals, converting the ultrasonic signals into electric signals and transmitting the electric signals to the signal processing module;
the signal processing module is used for receiving the electric signal, amplifying, filtering and secondarily amplifying the electric signal, comparing the voltage of the electric signal with a reference voltage to output a high level and a low level, and outputting the high level and the low level to the decoding module;
the decoding module is used for receiving the high and low levels, decoding the ultrasonic signals by using the waveforms formed by the high and low levels, outputting communication codes corresponding to the ultrasonic signals, and identifying vehicle-end signals corresponding to the communication codes.
Preferably, the signal processing module includes:
the negative input end of the first amplifier is connected with the first end of the first capacitor, the output end of the first amplifier is connected with the first end of the first capacitor through a first resistor, the second end of the first capacitor receives the electric signal through an eleventh resistor, the output end of the first amplifier is further connected with the first end of the second capacitor and the first end of the third capacitor through a second resistor, the positive input end of the first amplifier is connected with the positive input end of the second amplifier, the positive input end of the first amplifier is further connected with the first end of the second capacitor and the first end of the third capacitor through a twelfth resistor, the second end of the second capacitor is further connected with the second end of the third capacitor through a third resistor, the second end of the second capacitor is further connected with the output end of the second amplifier, and the second end of the third capacitor is further connected with the negative input end of the second amplifier, the output end of the second amplifier is connected with the negative input end of a third amplifier through a fourth resistor and a fourth capacitor in sequence, the negative input end of the third amplifier is connected with the output end of the third amplifier through a fifteenth resistor, the positive input end of the third amplifier is connected with the power supply voltage through a thirteenth resistor, the positive input end of the third amplifier is connected with the positive input end of the first amplifier, the positive input end of the third amplifier is grounded through a sixth resistor and an eighth resistor in sequence, two ends of the eighth resistor are connected with a seventh capacitor in parallel, the positive input end of the third amplifier is grounded through a seventh resistor, the positive input end of the third amplifier is grounded through a fifth capacitor and a sixth capacitor respectively, and the output end of the third amplifier is connected with the positive input end of the fourth amplifier through a ninth resistor, the positive input end of the fourth amplifier is also connected with power supply voltage through a fifth resistor, the negative input end of the fourth amplifier is also connected with reference voltage through a fourteenth resistor, the negative input end of the fourth amplifier is also grounded through the seventh capacitor, and the output end of the fourth amplifier outputs the high and low levels through a tenth resistor.
Preferably, the communication code includes: the ultrasonic signal transmitting device comprises a guide code, a device code, a data identification code, a data inverse code and an end code, wherein the guide code represents the beginning of one frame of data, the end code represents the end of one frame of data, the device code represents the code of the device for transmitting the ultrasonic signal, the data identification code represents the data type of a vehicle-end signal, the data code represents the signal content, and the data inverse code is that the data code is inverted according to the position.
Preferably, the pilot code, the device code, the data identification code, the data complement code, and the end code are all composed of logic 0 and logic 1, an ultrasonic waveform representing logic 0 in the ultrasonic signal includes an ultrasonic carrier wave of a first frequency of a first duration and a carrier-free wave of a second duration, an ultrasonic waveform representing logic 1 in the ultrasonic signal includes an ultrasonic carrier wave of a first frequency of a third duration and a carrier-free wave of a fourth duration, the first duration is the same as the third duration and the second duration is different from the fourth duration, or the first duration is different from the third duration and the second duration is the same as the fourth duration.
Preferably, the vehicle end signal receiving device is arranged on the electric vehicle battery replacing terminal.
A communication system comprises the vehicle-end signal transmitting device and the vehicle-end signal receiving device.
A vehicle-end signal transmitting method comprises the following steps:
collecting vehicle end signals;
generating a communication code corresponding to the vehicle-end signal;
generating a pulse signal corresponding to the communication code;
and converting the pulse signal into an ultrasonic signal and transmitting.
A vehicle-end signal receiving method comprises the following steps:
receiving an ultrasonic signal;
converting the ultrasonic signal into an electrical signal;
amplifying, filtering and secondarily amplifying the electric signal;
outputting high and low levels by performing voltage comparison of the electric signal with a reference voltage;
and decoding the ultrasonic signal by using the waveform composed of the high and low levels, outputting a communication code corresponding to the ultrasonic signal, and identifying a vehicle-end signal corresponding to the communication code.
On the basis of the common knowledge in the field, the above preferred conditions can be combined randomly to obtain the preferred embodiments of the invention.
The positive progress effects of the invention are as follows: the vehicle-end signal is transmitted in an ultrasonic mode, so that the vehicle-end signal transmission device has good anti-interference performance, is not easy to generate signal transmission abnormity due to the change of an external environment, and is more reliable in vehicle-end signal transmission. In addition, the vehicle end signal transmitting and receiving device has the advantages of simple structure, low cost, stable technology, high reliability and the like.
Drawings
Fig. 1 is a schematic block diagram of a vehicle-end signal transmitting apparatus according to embodiment 1 of the present invention.
Fig. 2 is a schematic block diagram of a vehicle-side signal receiving device according to embodiment 2 of the present invention.
Fig. 3 is a circuit schematic diagram of a signal processing module according to embodiment 2 of the present invention.
Fig. 4 is a schematic block diagram of a communication system according to embodiment 3 of the present invention.
Fig. 5 is a flowchart of a vehicle-end signal transmitting method according to embodiment 4 of the present invention.
Fig. 6 is a flowchart of a vehicle-side signal receiving method according to embodiment 5 of the present invention.
Detailed Description
The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.
Example 1
Fig. 1 shows a vehicle-end signal transmitting apparatus of the present embodiment. The vehicle-end signal transmitting device 10 may include: a signal acquisition module 101, a pulse generation module 102, an encoding module 103 and an ultrasonic transmission module 104. The signal acquisition module 101 may be connected to the encoding module 103, the encoding module 103 may be further connected to the pulse generation module 102, and the pulse generation module 102 may be further connected to the ultrasonic generation module. In general, the connection may be a line connection, but the embodiment is not limited thereto, and the connection may also be a connection through a wireless communication module.
The signal acquisition module 101 may be configured to acquire a vehicle-end signal and transmit the vehicle-end signal to the encoding module 103.
The encoding module 103 may be configured to receive the vehicle-end signal and output a communication code corresponding to the vehicle-end signal to the pulse generating module 102.
The pulse generating module 102 may be configured to receive the communication code and output a pulse signal corresponding to the communication code to the ultrasonic transmitting module 104.
The ultrasonic wave transmitting module 104 may be configured to receive the pulse signal, convert the pulse signal into an ultrasonic wave signal, and transmit the ultrasonic wave signal.
The vehicle-end signal may be any data type signal generated by the vehicle or a part of the vehicle, such as a battery replacement state signal (e.g., which step the battery replacement process progresses) generated by the electric vehicle or a vehicle battery support (a mechanism for mounting the battery) in the battery replacement process, a signal indicating whether the battery is mounted, a signal indicating a battery state (e.g., an operating state, a voltage, and whether the battery is in a power shortage state), a signal indicating a vehicle state (e.g., whether the vehicle is started, whether the vehicle is running), and the like. In order to obtain the vehicle-end signal conveniently, the vehicle-end signal transmitting device may be mounted on a vehicle, and may form a connection with a certain device on the vehicle.
In this embodiment, the car-end signal transmitting device 10 may have a unique code, and the device for transmitting the ultrasonic signal is identified by the code. The communication code may include: a boot code, a device code, a data identification code, a data inverse code, and an end code. The guide code represents the start of frame data, the end code represents the end of the frame data, the equipment code represents the code of the vehicle-end signal transmitting device, the data identification code represents the data type of the vehicle-end signal, the data code represents the signal content, and the data inversion code is bit-wise inversion of the data code.
The coding module 103 may have a coding function, for example, PPM coding (pulse position modulation code), i.e., signal modulation is realized by the time interval between pulse trains. More specifically, the boot code, the device code, the data identification code, the data inverse code, and the end code may all be composed of a logic 0 and a logic 1. The ultrasonic waveform representing logic 0 in the ultrasonic signal comprises an ultrasonic carrier wave of a first frequency in a first time length and a carrier-free wave in a second time length, and the ultrasonic waveform representing logic 1 in the ultrasonic signal comprises an ultrasonic carrier wave of the first frequency in a third time length and a carrier-free wave in a fourth time length. In order to distinguish the ultrasonic waveforms representing logical 0 and logical 1, it may be set that: the first duration is the same as the third duration and the second duration is different from the fourth duration, or the first duration is different from the third duration and the second duration is the same as the fourth duration. For example, a logical 0 may be represented by an ultrasonic carrier of 0.5ms 40kHz and no carrier of 0.5ms, and a logical 1 may be represented by an ultrasonic carrier of 0.5ms 40kHz and no carrier of 1.5 ms.
The vehicle-end signal transmitting device 10 of the embodiment transmits the vehicle-end signal in the form of the ultrasonic signal, improves the anti-interference performance, and is not easy to cause signal transmission abnormality due to the change of the external environment, so that the transmission of the vehicle-end signal is more reliable. Moreover, the vehicle-end signal transmitting device also has the advantages of simple structure, low cost, stable technology, high reliability and the like.
Example 2
Fig. 2 shows a vehicle-end signal receiving device of the present embodiment. The vehicle-end signal receiving device 20 may include: an ultrasonic wave receiving module 201, a signal processing module 202 and a decoding module 203. The ultrasonic receiving module 201 may be connected to the signal processing module 202, and the signal processing module 202 may also be connected to the decoding module 203. In general, the connection may be a line connection, but the embodiment is not limited thereto, and the connection may also be a connection through a wireless communication module.
The ultrasonic receiving module 201 may be configured to receive an ultrasonic signal, convert the ultrasonic signal into an electrical signal, and transmit the electrical signal to the signal processing module 202.
The signal processing module 202 may be configured to receive the electrical signal, amplify, filter, and secondarily amplify the electrical signal, output a high level and a low level by performing voltage comparison between the electrical signal and a reference voltage, and output the high level and the low level to the decoding module 203.
The decoding module 203 may be configured to receive the high and low levels, decode the ultrasonic signal by using a waveform composed of the high and low levels, output a communication code corresponding to the ultrasonic signal, and identify a train-end signal corresponding to the communication code.
Fig. 3 shows a specific circuit of a signal processing module 202 of the present embodiment. The signal processing module 202 may include:
a negative input terminal of a first amplifier IOP1 is connected to a first terminal of a first capacitor C1, an output terminal of the first amplifier IOP1 is connected to a first terminal of the first capacitor C1 through a first resistor R1, a second terminal of the first capacitor C1 receives the electrical signal sig _ in through an eleventh resistor R11, an output terminal of the first amplifier IOP1 is further connected to a first terminal of a second capacitor C2 and a first terminal of a third capacitor C3 through a second resistor R2, a positive input terminal of the first amplifier IOP1 is connected to a positive input terminal of a second amplifier IOP2, a positive input terminal of the first amplifier IOP1 is further connected to a first terminal of the second capacitor C2 and a first terminal of the third capacitor C3 through a twelfth resistor R12, respectively, a second terminal of the second capacitor C2 and a second terminal of the third capacitor C3 are further connected to a third resistor R375, and a second terminal of the second amplifier IOP2 is further connected to a second terminal of the second capacitor C57324, the second end of the third capacitor C3 is further connected to the negative input terminal of the second amplifier IOP2, the output terminal of the second amplifier IOP2 is further connected to the negative input terminal of the third amplifier IOP3 through a fourth resistor R4 and a fourth capacitor C4 in sequence, the negative input terminal of the third amplifier IOP3 is further connected to the output terminal of the third amplifier IOP3 through a fifteenth resistor R15, the positive input terminal of the third amplifier IOP3 is connected to the power supply voltage through a thirteenth resistor R13, the positive input terminal of the third amplifier IOP3 is further connected to the positive input terminal of the first amplifier 1, the positive input terminal of the third amplifier IOP3 is further connected to the ground through a sixth resistor R6 and an eighth resistor R8 in sequence, the two ends of the eighth resistor R8 are further connected to the seventh capacitor C7 in parallel, the positive input terminal of the third amplifier IOP3 is further connected to the ground through a seventh resistor R7, the positive input terminal of the third amplifier IOP3 is further connected to the sixth capacitor C6 and the sixth capacitor C6, the output terminal of the third amplifier IOP3 is further connected to the positive input terminal of the fourth amplifier IOP4 through a ninth resistor R9, the positive input terminal of the fourth amplifier IOP4 is further connected to the power supply voltage VCC through a fifth resistor R5, the negative input terminal of the fourth amplifier IOP4 is further connected to the reference voltage Vref through a fourteenth resistor R14, the negative input terminal of the fourth amplifier IOP4 is further connected to the ground GND through the seventh capacitor C7, and the output terminal of the fourth amplifier IOP4 is further connected to the high/low level sig _ out through a tenth resistor R11.
The vehicle-end signal may be any data type signal generated by the vehicle or a part of the vehicle, such as a battery replacement state signal (e.g., which step the battery replacement process progresses) generated by the electric vehicle or a vehicle battery support (a mechanism for mounting the battery) in the battery replacement process, a signal indicating whether the battery is mounted, a signal indicating a battery state (e.g., an operating state, a voltage, and whether the battery is in a power shortage state), a signal indicating a vehicle state (e.g., whether the vehicle is started, whether the vehicle is running), and the like. By identifying the vehicle-end signal, the vehicle or local conditions of the vehicle can be known.
In this embodiment, the device that transmits the ultrasonic signal may have a unique code, by which the device that transmits the ultrasonic signal is identified. The communication code may include: the ultrasonic signal transmitting device comprises a guide code, a device code, a data identification code, a data inverse code and an end code, wherein the guide code represents the beginning of one frame of data, the end code represents the end of one frame of data, the device code represents the code of the device for transmitting the ultrasonic signal, the data identification code represents the data type of a vehicle-end signal, the data code represents the signal content, and the data inverse code is that the data code is inverted according to the position.
More specifically, the boot code, the device code, the data identification code, the data inverse code, and the end code may all be composed of a logic 0 and a logic 1. The ultrasonic waveform representing logic 0 in the ultrasonic signal comprises an ultrasonic carrier wave of a first frequency in a first time length and a carrier-free wave in a second time length, and the ultrasonic waveform representing logic 1 in the ultrasonic signal comprises an ultrasonic carrier wave of the first frequency in a third time length and a carrier-free wave in a fourth time length. In order to distinguish the ultrasonic waveforms representing logical 0 and logical 1, it may be set that: the first duration is the same as the third duration and the second duration is different from the fourth duration, or the first duration is different from the third duration and the second duration is the same as the fourth duration. For example, a logical 0 may be represented by an ultrasonic carrier of 0.5ms 40kHz and no carrier of 0.5ms, and a logical 1 may be represented by an ultrasonic carrier of 0.5ms 40kHz and no carrier of 1.5 ms.
The vehicle-end signal receiving device 20 may be disposed as a separate product at a location where a vehicle-end signal needs to be received, or may be integrated with other devices, for example, the vehicle-end signal receiving device 20 may be disposed on an electric vehicle battery replacement terminal and used as a module for receiving a vehicle-end signal in the electric vehicle battery replacement terminal. The electric vehicle battery replacement terminal is equipment for providing a battery replacement service for an electric vehicle, and is mainly used for taking out a battery from the electric vehicle and/or installing the battery to the electric vehicle. In order to ensure the sending and receiving of the vehicle-end signal, the distance between the vehicle-end signal receiving device 20 and the vehicle-end signal transmitting device 10 does not exceed the normal transmission distance of the ultrasonic signal.
The vehicle-end signal receiving device 20 of the embodiment improves the anti-interference performance by receiving and identifying the vehicle-end signal transmitted in the form of the ultrasonic signal, and is not easy to generate signal transmission abnormality due to the change of the external environment, so that the transmission of the vehicle-end signal is more reliable. In addition, the vehicle-end signal receiving device has the advantages of simple structure, low cost, stable technology, high reliability and the like.
Example 3
This embodiment provides a communication system including the vehicle-end signal transmitting device 10 in embodiment 1 and the vehicle-end signal receiving device 20 in embodiment 2, as shown in fig. 4. The vehicle-end signal transmitting device 10 may transmit a vehicle-end signal in the form of ultrasonic waves to the vehicle-end signal receiving device 20, and the vehicle-end signal receiving device 20 may receive and recognize the vehicle-end signal in the form of ultrasonic waves, thereby grasping the vehicle condition. And the transmission of the vehicle-end signal has good anti-interference performance, and the signal transmission abnormity is not easy to occur due to the change of the external environment, so that the transmission of the vehicle-end signal is more reliable. Moreover, the communication system formed by the vehicle-end signal transmitting device 10 and the vehicle-end signal receiving device 20 has the advantages of simple structure, low cost, stable technology, high reliability and the like.
Example 4
The embodiment provides a vehicle-end signal transmitting method. The vehicle-end signal transmitting method can be implemented by applying the vehicle-end signal transmitting device in embodiment 1. As shown in fig. 5, the method may specifically include:
s11: collecting vehicle end signals;
s12: generating a communication code corresponding to the vehicle-end signal;
s13: generating a pulse signal corresponding to the communication code;
s14: and converting the pulse signal into an ultrasonic signal and transmitting.
The method of the embodiment can realize the acquisition, conversion and transmission of the vehicle-end signals, the vehicle-end signals are transmitted in the ultrasonic form, the anti-interference performance is good, the abnormal signal transmission caused by the change of the external environment is not easy to occur, and the transmission of the vehicle-end signals is more reliable.
Example 5
The embodiment provides a vehicle-end signal receiving method. The vehicle-side signal receiving method can be implemented by applying the vehicle-side signal receiving device in embodiment 2. As shown in fig. 6, the method may specifically include:
s21: receiving an ultrasonic signal;
s22: converting the ultrasonic signal into an electrical signal;
s23: amplifying, filtering and secondarily amplifying the electric signal;
s24: outputting high and low levels by performing voltage comparison of the electric signal with a reference voltage;
s25: and decoding the ultrasonic signal by using the waveform composed of the high and low levels, outputting a communication code corresponding to the ultrasonic signal, and identifying a vehicle-end signal corresponding to the communication code.
The method of the embodiment can realize the receiving, conversion and identification of the vehicle-end signal, receives the vehicle-end signal transmitted in the form of ultrasonic waves, has good anti-interference performance, is not easy to generate signal transmission abnormity due to the change of external environment, and ensures that the transmission of the vehicle-end signal is more reliable.
While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that these are by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.
Claims (12)
1. A vehicle-end signal transmitting device is characterized by comprising: the ultrasonic generator comprises a signal acquisition module, a pulse generation module, a coding module and an ultrasonic emission module, wherein the signal acquisition module is connected with the coding module, the coding module is also connected with the pulse generation module, and the pulse generation module is also connected with the ultrasonic generation module;
the signal acquisition module is used for acquiring vehicle-end signals and transmitting the vehicle-end signals to the coding module;
the encoding module is used for receiving the vehicle-end signal and outputting a communication code corresponding to the vehicle-end signal to the pulse generating module;
the pulse generating module is used for receiving the communication code and outputting a pulse signal corresponding to the communication code to the ultrasonic transmitting module;
the ultrasonic wave transmitting module is used for receiving the pulse signal, converting the pulse signal into an ultrasonic wave signal and transmitting the ultrasonic wave signal.
2. The vehicle-end signal transmitting device of claim 1, wherein the communication code comprises: the vehicle-end signal transmitting device comprises a guide code, an equipment code, a data identification code, a data inverse code and an end code, wherein the guide code represents the beginning of one frame of data, the end code represents the end of one frame of data, the equipment code represents the code of the vehicle-end signal transmitting device, the data identification code represents the data type of a vehicle-end signal, the data code represents the signal content, and the data inverse code is that the data code is inverted according to the position.
3. The vehicle-end signal transmitting device according to claim 2, wherein the pilot code, the device code, the data identification code, the data complement code, and the end code are each composed of a logic 0 and a logic 1, an ultrasonic waveform representing a logic 0 in the ultrasonic signal includes an ultrasonic carrier wave of a first frequency for a first duration and a carrierless wave for a second duration, an ultrasonic waveform representing a logic 1 in the ultrasonic signal includes an ultrasonic carrier wave of a first frequency for a third duration and a carrierless wave for a fourth duration, the first duration is the same as the third duration and the second duration is different from the fourth duration, or the first duration is different from the third duration and the second duration is the same as the fourth duration.
4. The vehicle-end signal emitting device of claim 1, wherein the vehicle-end signal emitting device is mounted on a vehicle.
5. A vehicle-end signal receiving device is characterized by comprising: the ultrasonic wave receiving module is connected with the signal processing module, and the signal processing module is also connected with the decoding module;
the ultrasonic receiving module is used for receiving ultrasonic signals, converting the ultrasonic signals into electric signals and transmitting the electric signals to the signal processing module;
the signal processing module is used for receiving the electric signal, amplifying, filtering and secondarily amplifying the electric signal, comparing the voltage of the electric signal with a reference voltage to output a high level and a low level, and outputting the high level and the low level to the decoding module;
the decoding module is used for receiving the high and low levels, decoding the ultrasonic signals by using the waveforms formed by the high and low levels, outputting communication codes corresponding to the ultrasonic signals, and identifying vehicle-end signals corresponding to the communication codes.
6. The vehicle-end signal receiving device according to claim 5, wherein the signal processing module includes:
the negative input end of the first amplifier is connected with the first end of the first capacitor, the output end of the first amplifier is connected with the first end of the first capacitor through a first resistor, the second end of the first capacitor receives the electric signal through an eleventh resistor, the output end of the first amplifier is further connected with the first end of the second capacitor and the first end of the third capacitor through a second resistor, the positive input end of the first amplifier is connected with the positive input end of the second amplifier, the positive input end of the first amplifier is further connected with the first end of the second capacitor and the first end of the third capacitor through a twelfth resistor, the second end of the second capacitor is further connected with the second end of the third capacitor through a third resistor, the second end of the second capacitor is further connected with the output end of the second amplifier, and the second end of the third capacitor is further connected with the negative input end of the second amplifier, the output end of the second amplifier is connected with the negative input end of a third amplifier through a fourth resistor and a fourth capacitor in sequence, the negative input end of the third amplifier is connected with the output end of the third amplifier through a fifteenth resistor, the positive input end of the third amplifier is connected with the power supply voltage through a thirteenth resistor, the positive input end of the third amplifier is connected with the positive input end of the first amplifier, the positive input end of the third amplifier is grounded through a sixth resistor and an eighth resistor in sequence, two ends of the eighth resistor are connected with a seventh capacitor in parallel, the positive input end of the third amplifier is grounded through a seventh resistor, the positive input end of the third amplifier is grounded through a fifth capacitor and a sixth capacitor respectively, and the output end of the third amplifier is connected with the positive input end of the fourth amplifier through a ninth resistor, the positive input end of the fourth amplifier is also connected with power supply voltage through a fifth resistor, the negative input end of the fourth amplifier is also connected with reference voltage through a fourteenth resistor, the negative input end of the fourth amplifier is also grounded through the seventh capacitor, and the output end of the fourth amplifier outputs the high and low levels through a tenth resistor.
7. The vehicle-end signal receiving device according to claim 5, wherein the communication code includes: the ultrasonic signal transmitting device comprises a guide code, a device code, a data identification code, a data inverse code and an end code, wherein the guide code represents the beginning of one frame of data, the end code represents the end of one frame of data, the device code represents the code of the device for transmitting the ultrasonic signal, the data identification code represents the data type of a vehicle-end signal, the data code represents the signal content, and the data inverse code is that the data code is inverted according to the position.
8. The vehicle-end signal receiving device according to claim 7, wherein the pilot code, the device code, the data identification code, the data complement code, and the end code are each composed of a logic 0 and a logic 1, an ultrasonic waveform representing a logic 0 in the ultrasonic signal includes an ultrasonic carrier wave of a first frequency for a first duration and a carrierless wave for a second duration, an ultrasonic waveform representing a logic 1 in the ultrasonic signal includes an ultrasonic carrier wave of a first frequency for a third duration and a carrierless wave for a fourth duration, the first duration is the same as the third duration and the second duration is different from the fourth duration, or the first duration is different from the third duration and the second duration is the same as the fourth duration.
9. The vehicle-end signal receiving device according to claim 5, wherein the vehicle-end signal receiving device is disposed on an electric vehicle battery replacement terminal.
10. A communication system, characterized by comprising the vehicle-end signal transmitting apparatus according to any one of claims 1 to 4 and the vehicle-end signal receiving apparatus according to any one of claims 5 to 9.
11. A vehicle-end signal transmitting method is characterized by comprising the following steps:
collecting vehicle end signals;
generating a communication code corresponding to the vehicle-end signal;
generating a pulse signal corresponding to the communication code;
and converting the pulse signal into an ultrasonic signal and transmitting.
12. A vehicle-end signal receiving method is characterized by comprising the following steps:
receiving an ultrasonic signal;
converting the ultrasonic signal into an electrical signal;
amplifying, filtering and secondarily amplifying the electric signal;
outputting high and low levels by performing voltage comparison of the electric signal with a reference voltage;
and decoding the ultrasonic signal by using the waveform composed of the high and low levels, outputting a communication code corresponding to the ultrasonic signal, and identifying a vehicle-end signal corresponding to the communication code.
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