CN114084027B

CN114084027B - Wireless charging communication method for electric automobile

Info

Publication number: CN114084027B
Application number: CN202111432452.3A
Authority: CN
Inventors: 樊彬; 张宝强; 王朝晖; 李津; 张萌; 黄炘; 孔治国; 兰昊; 吕炎; 李川; 李杨; 陈丽雪; 蔡悦; 王娇娇; 高燕万; 李晓; 陈赫
Original assignee: China Automotive Research New Energy Vehicle Inspection Center Tianjin Co ltd
Current assignee: China Automotive Research New Energy Vehicle Inspection Center Tianjin Co ltd
Priority date: 2021-11-29
Filing date: 2021-11-29
Publication date: 2023-10-20
Anticipated expiration: 2041-11-29
Also published as: KR20230080271A; CN114084027A

Abstract

The invention provides a wireless charging communication method for an electric automobile, which comprises the following steps of: establishing a communication relationship between the IVU of the vehicle-mounted equipment and the CSU of the ground equipment; a charging starting stage: the vehicle-mounted equipment and the ground equipment sequentially execute communication operations of compatibility detection pre-detection, initial foreign matter detection, initial alignment detection, initial living body protection and frequency detection and locking; charging transmission stage: in the stage, the IVU sends a charging requirement to the CSU in real time, and the CSU adjusts output power according to the charging requirement, wherein the charging requirement and the power transmission communication interaction process are started; a charging stop phase: when the charging stopping condition is met, the IVU and the CSU can judge and initiate a charging stopping request, and after charging is stopped, the charging statistical data in the whole charging process are mutually sent. The wireless charging communication method for the electric automobile realizes normal, efficient and safe interaction during wireless charging of the electric automobile.

Description

Wireless charging communication method for electric automobile

Technical Field

The invention belongs to the technical field of wireless charging of electric automobiles, and particularly relates to a communication method for vehicle-mounted equipment and ground equipment of a wireless charging system of an electric automobile.

Background

The wireless charging system of the electric automobile comprises vehicle-mounted equipment arranged on the automobile to be charged and ground equipment for supplying power to the automobile to be charged, and the vehicle-mounted equipment and the ground equipment are not directly connected with each other. In order to ensure the normal operation of the wireless charging system, the control modes of the vehicle-mounted equipment and the ground equipment are mainly two, namely single-side control and double-side control. The unilateral control means that the adjustment of key parameters such as the output power of the system is independently completed by ground equipment or vehicle-mounted equipment, and the other end does not participate in the adjustment; bilateral control refers to that the vehicle-mounted equipment and the ground equipment participate in the overall adjustment of the wireless charging system at the same time. At present, the mainstream control mode is bilateral control, that is, in the wireless charging process, the charging process needs to be controlled and managed through wireless communication between the vehicle-mounted equipment and the ground equipment.

Considering the requirements of development of the electric automobile industry and the convenience of charging in future public places, the vehicle-mounted equipment and the ground equipment in the wireless charging scene come from different equipment manufacturers to a great extent, and the problem of non-uniformity of communication protocols and the like may exist. Therefore, the communication method of the vehicle-mounted equipment and the ground equipment becomes a key point for ensuring normal, efficient and safe interaction between different vehicle-mounted equipment and ground equipment.

Disclosure of Invention

In view of the above, the present invention aims to provide a wireless charging communication method for an electric vehicle, which is used for realizing normal, efficient and safe interaction of the wireless charging system of the electric vehicle.

In order to achieve the above purpose, the technical scheme of the invention is realized as follows:

a wireless charging communication method for an electric automobile, comprising:

charging connection stage: establishing a communication relationship between the IVU of the vehicle-mounted equipment and the CSU of the ground equipment;

a charging starting stage: the vehicle-mounted equipment and the ground equipment sequentially execute compatibility detection pre-detection, initial foreign matter detection, initial alignment detection, initial living body protection and frequency detection and locking operation;

charging transmission stage: in the stage, the IVU sends a charging requirement to the CSU in real time, and the CSU adjusts output power according to the charging requirement, wherein the charging requirement and power transmission interaction process is started;

a charging stop phase: when the charging stopping condition is met, the IVU and the CSU can judge and initiate a charging stopping request, and after charging is stopped, the charging statistical data in the whole charging process are mutually sent.

Further, the specific method of the charging connection stage is as follows:

after the IVU is awakened, wireless communication connection is carried out with the CSU, communication is established, the ground terminal equipment is activated, and the IVU and the CSU execute a registration authentication flow;

Wherein the registration authentication is an optional communication link.

Further, the communication method of the compatibility detection pre-detection comprises the following steps: the compatibility detection pre-detection request message and the compatibility detection pre-detection request response message are used as communication messages, and the communication messages are circulated between the IVU of the vehicle-mounted equipment and the CSU of the ground equipment, so that the compatibility detection pre-detection of the vehicle-mounted equipment and the ground equipment is realized;

the communication method for initial foreign matter detection comprises the following steps: the method comprises the steps that an initial foreign matter detection request message and an initial foreign matter detection request response message are used as communication messages, circulation is conducted between an IVU of the vehicle-mounted equipment and a CSU of the ground equipment, and initial foreign matter detection of the vehicle-mounted equipment and the ground equipment is achieved;

the communication method for initial alignment detection comprises the following steps: the initial alignment detection request message and the initial alignment detection request response message are used as communication messages, and the communication between the IVU of the vehicle-mounted equipment and the CSU of the ground equipment is realized, so that the initial alignment detection of the vehicle-mounted equipment and the ground equipment is realized;

the communication method of the initial living body protection comprises the following steps: the method comprises the steps that an initial living body protection request message and an initial living body protection request response message are used as communication messages, circulation is conducted between an IVU of the vehicle-mounted equipment and a CSU of the ground equipment, and initial living body protection of the vehicle-mounted equipment and the ground equipment is achieved;

Before performing the frequency detection and locking operation, it is necessary to determine whether the initial foreign matter detection and the initial living body protection detection pass or not, and then perform the operation after passing;

the communication method for frequency detection and locking comprises the following steps: the frequency detection and locking request message, the frequency detection and locking request response message, the vehicle-mounted terminal equipment frequency locking success confirmation message and the ground terminal equipment frequency locking success confirmation message are used as communication messages, and circulation is carried out between the IVU of the vehicle-mounted equipment and the CSU of the ground equipment, so that the frequency detection and locking of the vehicle-mounted equipment and the ground equipment are realized.

Further, the compatibility detection pre-detection request message comprises a message transmitting end name, a vehicle-mounted end device power grade, a vehicle-mounted end device resonance compensation circuit topology, a vehicle-mounted end device coil type, a vehicle-mounted end device ground clearance grade, a vehicle-mounted end device foreign matter detection method, a vehicle-mounted end device living body protection method, a vehicle-mounted end device alignment detection method, a vehicle-mounted end device output voltage maximum value and a vehicle-mounted end device output current maximum value;

the compatibility detection pre-detection request response message comprises a message transmitting end name, a ground end device power level, a ground end device resonance compensation circuit topology, a ground end device coil type, a ground end device ground clearance level, a ground end device foreign matter detection method, a ground end device living body protection method, a ground end device alignment detection method, a ground end device coil maximum current value and a response result identifier;

The initial foreign matter detection request message comprises a message transmitting end name;

the initial foreign matter detection request response message comprises a message transmitting end name and a ground end initial foreign matter detection result;

the initial living body protection request message comprises a message transmitting end name;

the initial living body protection request response message comprises a message transmitting end name and a ground end initial living body protection detection result;

the frequency detection and locking request message comprises a message transmitting end name and a primary coil current instruction value;

the frequency detection and locking request response message comprises a message transmitting end name, a frequency locking response signal, a primary coil maximum allowable current value, a primary coil minimum allowable current value and a primary coil current actual value;

the vehicle-mounted terminal equipment frequency locking success confirmation message comprises a message transmitting terminal name, a result identifier and a primary coil current instruction value locked in a frequency detection and locking link;

the ground terminal equipment frequency locking success confirmation message comprises a message transmitting terminal name and a primary coil current actual value locked in a frequency detection and locking link.

Further, the communication method of the initial alignment detection includes a communication method for the LPE scheme and a communication method for the LF scheme;

In the communication method of the LPE scheme, an initial alignment detection request message comprises a message transmitting end name, an LPE signal start-stop instruction and a primary coil current instruction value; the initial alignment detection request response message content comprises a message transmitting end name, an LPE signal start-stop state and a primary coil current actual value;

in the communication method of the LF scheme, an initial alignment detection request message comprises a message transmitting end name, an LF signal start-stop instruction, an LF signal frequency instruction value and an LF signal current instruction value; the initial alignment detection request response message comprises a message transmitting end name, an LF signal start-stop state, an LF signal frequency actual value, an LF signal current actual value, an LF coil 1 orientation, an X coordinate of the LF coil 1, a Y coordinate of the LF coil 1, a Z coordinate of the LF coil 1, an LF coil 2 orientation, an X coordinate of the LF coil 2, a Y coordinate of the LF coil 2, a Z coordinate of the LF coil 2, an LF coil 3 orientation, an X coordinate of the LF coil 3, a Y coordinate of the LF coil 3, a Z coordinate of the LF coil 3, an LF coil 4 orientation, an X coordinate of the LF coil 4, a Y coordinate of the LF coil 4 and a Z coordinate of the LF coil 4, wherein the coordinates are coordinates in a coordinate system taking a power coil center point as an origin.

Further, when executing the communication of the compatibility detection and pre-detection, the IVU of the vehicle-mounted device needs to send a request message of the compatibility detection and pre-detection to the CSU, the CSU needs to determine whether to receive the request message of the compatibility detection and pre-detection, if the communication is established between the IVU and the CSU, the IVU does not receive the request message of the compatibility detection and pre-detection within a set time, and the CSU sends an error message of the ground terminal;

When the initial foreign matter detection communication is executed, the IVU of the vehicle-mounted equipment needs to send an initial foreign matter detection request message to the CSU, the CSU needs to judge whether the initial foreign matter detection request message is received or not, if the initial foreign matter detection request message is not received within a set time from the moment that the IVU sends the compatibility detection pre-detection request message, the CSU sends a ground end error message;

when initial alignment detection communication is executed, the IVU of the vehicle-mounted equipment needs to send an initial alignment detection request message to the CSU, the CSU needs to judge whether the initial alignment detection request message is received or not, if the initial alignment detection request message is not received within a set time from the initial foreign matter detection request response message is sent, the CSU sends a ground terminal error message;

when the initial living body protection communication is executed, the IVU of the vehicle-mounted equipment needs to send an initial living body protection request message to the CSU, the CSU needs to judge whether the initial living body protection request message is received or not, if the initial living body protection request message is not received within a set time from the initial alignment detection request response message is sent, the CSU sends a ground end error message;

when executing frequency detection and locking communication, the IVU of the vehicle-mounted device needs to send a frequency detection and locking request message to the CSU, the CSU needs to judge whether the frequency detection and locking request message is received or not, if the frequency detection and locking request message is not received within a set time from the sending of a living body protection request message, the CSU sends a ground end error message.

Further, the charging transmission stage comprises a charging request starting communication link and a power transmission communication link which are sequentially executed;

the communication method for starting the charging request comprises the following steps: the method comprises the steps that a charging starting request message and a charging starting request response message are used as communication messages, circulation is conducted between an IVU of the vehicle-mounted equipment and a CSU of the ground equipment, and interaction of charging starting requests of the vehicle-mounted equipment and the ground equipment is achieved;

the charging starting request message comprises a message transmitting end name and a starting type;

the charging request starting response message comprises a message transmitting end name and a response result identifier;

the communication method of the power transmission comprises the following steps: the charging demand message and the charging state information message are used as communication messages, and circulation is carried out between the IVU of the vehicle-mounted equipment and the CSU of the ground equipment so as to realize efficiency optimization in the charging process;

the charging demand message comprises a message transmitting end name and a primary coil current instruction value;

the charging state information message comprises a message transmitting end name, a primary coil maximum allowable current value, a primary coil minimum allowable current value, a received primary coil current instruction value, a primary coil current actual value and an input power value of ground end equipment.

Further, in the charging stopping stage, when the IVU initiates a charging stopping request and the CSU initiates a charging stopping request, an IVU charging stopping message and a CSU charging stopping message are adopted as communication messages, and circulation is carried out between the IVU of the vehicle-mounted equipment and the CSU of the ground equipment, so that interaction when the IVU or the CSU initiates the charging stopping request is realized;

the IVU charge stopping message comprises a message transmitting end name, a primary coil current instruction value, an IVU normal charge stopping non-system fault reason for IVU charge stopping and an IVU charge stopping system fault reason;

the CSU charge stopping message comprises a message transmitting end name, a primary coil current actual value, a CSU normal stop charge, a CSU charge stopping non-system fault reason and a CSU charge stopping system fault reason.

Further, in the charge stopping stage, the communication method of the charge data statistics is as follows: taking the vehicle-side charging statistics data message and the ground-side charging statistics data message as communication messages, and circulating between the IVU of the vehicle-mounted equipment and the CSU of the ground equipment to realize charging data statistics after stopping charging;

the vehicle-end charging statistics data message comprises a message transmitting end name, single-time charging direct current output energy and a suspension state of charge (SOC);

The ground terminal charging statistics data message comprises a message transmitting terminal name, accumulated charging time and single charging alternating current consumption electric energy;

in the charging stopping stage, the charging stopping device also comprises IVU cancellation, wherein the IVU cancellation is an optional communication link;

when the IVU is logged out, whether registration authentication is executed or not when the IVU establishes communication with the CSU needs to be judged, and if the step is executed, the IVU is required to be logged out.

Further, in the whole charging process, when the IVU or the CSU detects that the communication is time-out, an error message is sent, including:

error message at vehicle end:

when the IVU detects the communication timeout, the error message is sent to the CSU vehicle end, and the content comprises a message transmitting end name, a receiving compatibility detection pre-detection request response message timeout, an initial foreign object detection request response message timeout, an initial alignment detection request response message timeout, an initial living body protection request response message timeout, a receiving frequency detection and locking request response message timeout, a receiving ground end frequency locking success confirmation message timeout, a receiving start charging request response message timeout, a receiving charging state information message timeout, a receiving CSU stopping charging message timeout and a receiving ground end charging statistics data message timeout;

Ground end error message:

when the CSU detects the communication timeout, the CSU sends error messages to the IVU ground terminal, wherein the content comprises a message transmitting terminal name, a receiving compatibility detection pre-detection request message timeout, an initial foreign object detection request message timeout, an initial alignment detection request message timeout, an initial living body protection request message timeout, a receiving frequency detection and locking request message timeout, a receiving vehicle terminal frequency locking success confirmation message timeout, a receiving start charging request message timeout, a receiving charging requirement message timeout, a receiving IVU stopping charging message timeout and a receiving vehicle terminal charging statistics data message timeout;

failure result message:

when the IVU detects that a certain communication link fails to be completed normally, sending a CSU result failure message, wherein the message comprises a message transmitting end name, a compatibility detection pre-detection failure, an initial foreign matter detection link overtime, a foreign matter detection link detecting a foreign matter, an initial alignment detection failure, an initial living body protection link overtime, a living body detection link detecting a living body, a frequency detection and locking failure, a charging start request failure and a charging stop failure;

the fault processing method in the whole charging process is also included, and the fault processing modes are divided into a plurality of modes according to the severity level of the fault, and the fault processing method comprises the following steps:

Automatic recovery: and ending the current charging flow, and jumping to a charging connection state. According to the message content, the IVU reestablishes WIFI connection with the CSU, or reports information of the replacement parking space and the like;

no treatment was performed: performing equipment maintenance after charging is finished;

immediately stopping the charging: if the IVU detects the fault, the IVU initiates abnormal stopping of charging; if the CSU detects the fault, the CSU initiates abnormal stopping of charging.

Compared with the prior art, the wireless charging communication method for the electric automobile has the following advantages:

the wireless charging communication method for the electric automobile realizes normal, efficient and safe interaction during wireless charging of the electric automobile.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention. In the drawings:

FIG. 1 is a charging communication flow chart according to the present invention;

FIG. 2 is a communication flow chart of a compatibility detection pre-test according to the present invention;

FIG. 3 is a flow chart of an initial foreign object detection communication according to the present invention;

FIG. 4 is a communication flow chart of an initial alignment detection LPE scheme according to the present invention;

Fig. 5 is a communication flow chart of an initial alignment detection LF scheme according to the present disclosure;

FIG. 6 is a flow chart of an initial in-vivo protection detection communication according to the present invention;

FIG. 7 is a flow chart of frequency detection and lock-in communications according to the present invention;

FIG. 8 is a communication flow diagram of scheme one of the charge request phase of the present invention;

FIG. 9 is a communication flow chart of scheme II of the charge request phase of the present invention;

fig. 10 is a communication flow diagram of a scheme one of the power transfer phase of the present invention;

fig. 11 is a communication flow chart of a scheme two of the power transmission phase according to the present invention;

fig. 12 is a communication flow chart of IVU initiated stop charging according to the present invention;

fig. 13 is a communication flow chart of CSU initiated charging stop according to the present invention;

fig. 14 is a communication flow chart of the charge data statistics according to the present invention.

Detailed Description

It should be noted that, without conflict, the embodiments of the present invention and features of the embodiments may be combined with each other.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art in a specific case.

The invention will be described in detail below with reference to the drawings in connection with embodiments.

As shown in fig. 1, an electric vehicle wireless charging communication method includes:

a charging starting stage: the vehicle-mounted equipment and the ground equipment sequentially execute communication operations of compatibility detection pre-detection, initial foreign matter detection, initial alignment detection, initial living body protection and frequency detection and locking;

charging transmission stage: in the stage, the IVU sends a charging requirement to the CSU in real time, and the CSU adjusts output power according to the charging requirement, wherein the charging requirement and power transmission interaction are started;

A charging stop phase: when the charging stopping condition is met, the IVU and the CSU can judge and initiate a charging stopping request, and after mutually sending charging statistical data in the whole charging process, the charging is stopped.

The specific method of the charging connection phase communication is as follows:

wherein the registration authentication is an optional communication link.

In the charge start-up phase:

as shown in fig. 2, a specific method of the compatibility detection pre-check communication is as follows:

the IVU sends a compatibility detection pre-detection request message to the CSU, the CSU judges whether the compatibility detection request message is received or not, if the CSU does not receive the compatibility detection request message within a set time from the establishment of communication connection, the CSU sends a ground error message, if the CSU receives the compatibility detection request message, the IVU sends a compatibility detection pre-detection request response message, if the IVU does not receive the compatibility detection pre-detection request response message within the set time from the transmission of the compatibility detection pre-detection request message, the IVU sends a vehicle error message, if the IVU receives the compatibility detection pre-detection request response message, the IVU further judges whether the response identification and the IVU detection are successful or not, if the IVU does not succeed, the result is failed, and if the IVU succeeds, the compatibility detection pre-detection is ended.

The compatibility detection pre-detection request message at least comprises a message transmitting end name, a vehicle-mounted end device power grade, a vehicle-mounted end device resonance compensation circuit topology, a vehicle-mounted end device coil type, a vehicle-mounted end device ground clearance grade, a vehicle-mounted end device foreign matter detection method, a vehicle-mounted end device living body protection method, a vehicle-mounted end device alignment detection method, a vehicle-mounted end device output voltage maximum value and a vehicle-mounted end device output current maximum value.

The compatibility detection pre-inspection request message packet parameter format is shown in table 1:

TABLE 1

The compatibility detection pre-detection request response message at least comprises a message transmitting end name, a ground end device power level, a ground end device resonance compensation circuit topology, a ground end device coil type, a ground end device ground clearance level, a ground end device foreign matter detection method, a ground end device living body protection method, a ground end device alignment detection method, a ground end device coil maximum current value and a response result identifier.

The compatibility test pre-test request response message packet parameter format is shown in table 2:

TABLE 2

As shown in fig. 3, a specific method of initial foreign matter detection communication is as follows:

the IVU sends an initial foreign matter detection request message to the CSU, the CSU judges whether the foreign matter detection request message is received or not, if the CSU does not receive the initial foreign matter detection request message within a set time, the CSU sends a ground end error message, if the CSU receives the initial foreign matter detection request message, the IVU sends the initial foreign matter detection request response message, if the IVU does not receive the initial foreign matter detection request message within the set time, the IVU sends a vehicle end error message, if the IVU receives the initial foreign matter detection request response message, the IVU further judges whether the ground end initial foreign matter detection result is in detection, if the IVU does not receive the initial foreign matter detection request message, further judges whether the ground end initial foreign matter detection result exceeds the set time, if the CSU does not exceed the set time, the IVU returns to the initial step, and if the set time is exceeded, the IVU sends the result failure message; if the detection of the initial foreign matter at the ground end is finished, further judging whether the detection result of the initial foreign matter at the ground end is the existence of the foreign matter, if so, sending a failure message of the result, recommending a fault processing mode, and if not, ending the detection of the initial foreign matter.

The initial foreign matter detection request message comprises a message transmitting end name, and the parameter format of the message packet of the initial foreign matter detection request message is shown in table 3.

TABLE 3 Table 3

The initial foreign object detection request response message includes a message transmitting end name, a ground end initial foreign object detection result, and a message packet parameter format of the initial foreign object detection request response message, as shown in table 4:

TABLE 4 Table 4

As shown in fig. 4, the communication method of the initial alignment detection includes a communication method for the LPE scheme, specifically as follows:

the IVU sends an initial alignment detection request message to the CSU, requests to start an LPE signal, the CSU judges whether the initial alignment detection request message is received, if the initial alignment detection request message is not received by the CSU within a set time from the initial foreign object detection request response message is sent, the CSU sends a ground error message, when the initial alignment detection request message is received by the CSU, current is generated according to a primary coil current instruction value and an initial alignment detection request response message is sent to the IVU, if the initial alignment detection request message is sent, the initial alignment detection request response message is not received by the IVU within the set time, the vehicle error message is sent by the IVU, when the initial alignment detection request response message is received by the IVU, initial alignment detection calculation is carried out, and after calculation, whether the initial alignment detection is passed is judged, if the initial alignment detection is not passed, further performing initial alignment detection calculation, if initial alignment detection is not passed within a set time from the start of initial alignment detection calculation, sending a result failure message, if passed, sending an initial alignment detection request message to the CSU, requesting to stop the LPE signal, further judging whether the initial alignment detection request message is received by the CSU, if the initial alignment detection request message is not received within the set time from the start of sending the initial alignment detection request response message, sending a ground end error message, if the initial alignment detection request message is received by the CSU, stopping the primary coil current, and sending an initial alignment detection request response message to the IVU, judging whether the initial alignment detection request response message is received by the IVU, if the initial alignment detection request response message is not received within the set time, sending a vehicle end error message, if the initial alignment detection request message is received, further judging whether the LPE signal is stopped, if the LPE signal is stopped in a set time from the initial alignment detection request message, sending a result failure message, and if the LPE signal is stopped, ending the initial alignment detection;

The initial alignment detection request message comprises a message transmitting end name, an LPE signal start-stop instruction and a primary coil current instruction value; in the LPE scheme, the initial alignment detection request packet parameter format is shown in table 5:

TABLE 5

The content of the initial alignment detection request response message comprises the name of the message transmitting end, the start-stop state of the LPE signal and the actual value of the primary coil current, and in the LPE scheme, the parameter format of the initial alignment detection response message packet is shown in table 6:

TABLE 6

As shown in fig. 5, the communication method of initial alignment detection further includes a communication method for the LF scheme, which is specifically as follows:

the IVU sends an initial alignment detection request message to the CSU, requests to close the LF signal, the CSU judges whether the initial alignment detection request message is received, if the initial alignment detection request message is not received by the CSU within a set time from the initial foreign matter detection request response message is sent, the CSU sends a ground error message, when the initial alignment detection request message is received by the CSU, the IVU confirms that no LF signal is generated, and sends an initial alignment detection request response message to the IVU, if the initial alignment detection request message is sent, the initial alignment detection request response message is not received by the IVU within the set time, the vehicle error message is sent by the IVU, and if the initial alignment detection request response message is received by the IVU, whether the LF signal is detected is further judged, if the LF signal is not detected, the default LF signal frequency of the vehicle is selected, and sending an initial alignment detection request message request to the CSU, starting an LF signal, if the LF signal is detected, indicating that the detected signal is an LF signal of an adjacent parking space, identifying the frequency of the LF signal, selecting different LF signal frequencies for the parking space, sending an initial alignment detection request message request to the CSU, starting the LF signal, judging whether the initial alignment detection request message is received by the CSU, if the initial alignment detection request message is not received within a set time from the initial alignment detection request response message is sent, sending a ground end error message, if the initial alignment detection request message is received, generating the LF signal according to an LF signal instruction value, sending an initial alignment detection request response message to the IVU, if the initial alignment detection request message is sent by the IVU, and if the initial alignment detection request message is not received within the set time, sending a vehicle end error message, if the initial alignment detection calculation is not passed, continuing to perform initial alignment detection calculation, if the initial alignment detection calculation is not passed, sending a result failure message within a set time, if the initial alignment detection calculation is not passed, sending an initial alignment detection request message to the CSU, requesting to stop the LF signal, further judging whether the initial alignment detection request message is received or not by the CSU, if the initial alignment detection request message is sent, within the set time, not receiving the initial alignment detection request message, sending a ground end error message, if the initial alignment detection request message is received by the CSU, stopping the LF signal, sending an initial alignment detection request response message to the IVU, judging whether the initial alignment detection request response message is received by the IVU, if the initial alignment detection request message is not received within the set time, sending a vehicle end error message, if the initial alignment detection request message is received, further judging whether the LF signal is stopped, if the initial alignment detection request message is not stopped within the set time, sending the result is failed, and if the initial alignment detection is ended.

The initial alignment detection request message comprises a message transmitting end name, an LF signal start-stop instruction, an LF signal frequency instruction value and an LF signal current instruction value, and in the LF scheme, the message packet parameter format of the initial alignment detection request message is shown in table 7;

TABLE 7

The initial alignment detection request response message includes a message transmitting end name, an LF signal start-stop state, an LF signal frequency actual value, an LF signal current actual value, an LF coil 1 orientation, an X coordinate of the LF coil 1, a Y coordinate of the LF coil 1, a Z coordinate of the LF coil 1, an LF coil 2 orientation, an X coordinate of the LF coil 2, a Y coordinate of the LF coil 2, a Z coordinate of the LF coil 2, an LF coil 3 orientation, an X coordinate of the LF coil 3, a Y coordinate of the LF coil 3, a Z coordinate of the LF coil 3, an LF coil 4 orientation, an X coordinate of the LF coil 4, a Y coordinate of the LF coil 4, and a Z coordinate of the LF coil 4, where the coordinates are coordinates in a coordinate system with a power coil center point as an origin, and in the LF scheme, an initial alignment detection response message packet parameter format is shown in table 8:

TABLE 8

As shown in fig. 6, the communication method of the initial living body protection is specifically as follows:

the IVU sends an initial living body protection request message to the CSU, the CSU judges whether the initial living body protection request message is received or not, if the initial living body protection request message is sent from the initial alignment detection request response message or from the last frame message sent in the last communication link, the CSU sends a ground end error message in a set time, when the CSU receives the initial living body protection request message, the IVU sends the initial living body protection request response message to the IVU, if the IVU does not receive the initial living body protection request message in the set time, the IVU sends a vehicle end error message, when the IVU receives the initial living body protection request response message, the IVU further judges whether the ground end initial living body protection detection result is in detection, if the ground end error detection result is in detection, further judges whether the last frame initial living body protection request message is sent, if the set time is exceeded, the step of judging whether the initial living body protection request message is received or not is returned to if the set time is not exceeded, and if the set time is exceeded, the step of judging whether the initial living body protection request response message is received is failed; if the initial living body protection of the ground end is detected, further judging whether a living body exists in the detection result of the initial living body protection of the ground end, if so, sending a failure message of the result, recommending a fault processing mode, and if not, ending the detection of the initial foreign body;

The initial living body protection request message comprises a message transmitting end name, and the parameter format of the message packet of the initial living body protection request message is shown in table 9;

TABLE 9

The initial living body protection request response message comprises a message transmitting end name and a ground end initial living body protection detection result, and the message packet parameter format of the initial living body protection request response message is shown in table 10:

table 10

Frequency detection and locking is a mandatory link. Before entering this link, the system should pass initial foreign body detection and initial in vivo protection detection. In this communication link, the vehicle-mounted end equipment should be able to keep its operating frequency within the error allowable range (±0.05 kHz) consistent with the operating frequency of the ground end equipment.

As shown in fig. 7, the communication method of frequency detection and locking is specifically as follows:

the IVU starts to execute frequency detection and locking, the rectifier is set to be in a short circuit state, and a frequency detection and locking request message is sent to the CSU, the CSU judges whether the frequency detection and locking request message is received or not, if the frequency detection and locking request message is not received by the CSU within a set time from the time of sending a living body protection request message, the CSU sends a ground side error message, when the frequency detection and locking request message is received by the CSU, a line current with the frequency being the working frequency is generated according to a primary side coil current instruction value, and a frequency detection and locking request response message is sent to the IVU, if the frequency detection and locking request message is not received within the set time, the IVU sends a vehicle side error message, and further judges whether the input current of the rectifier is within a set range or not when the frequency detection and locking request response message is received by the IVU, if the frequency detection and locking request message is not received within the set time, the frequency detection and locking request message is not received by the CSU, and returns to a frequency detection and locking request message step, if the frequency detection and locking request message are not received within the set range is not received by the IVU, and if the frequency detection and locking request message is not received by the IVU is not received within the set time, and if the frequency detection and the locking request message is not received by the vehicle side is not successfully is not received, and the vehicle side is not successfully received within the set, and the set time is not successfully, and the frequency detection is not received by the vehicle side is continuously if the set, and the frequency detection is not received after the frequency detection and the frequency detection is not received within the set, and the set is not is successfully, and the set in the set time is not the set, and the frequency detection is continuously is not received when the frequency detection is continuously is not received within the set. And transmitting a ground end error message, if the ground end error message is received, keeping the actual current value of the primary coil to be the same as that of the locking, transmitting a ground end frequency locking success confirmation message to the IVU, judging whether the ground end frequency locking success confirmation message is received or not by the IVU, if the frequency detection and locking request message is not received within a set time from the transmission of the frequency detection and locking request message, transmitting a result failure message, and if the frequency detection and locking is finished.

The frequency detection and locking request message comprises a message transmitting end name and a primary coil current instruction value, and the parameter format of the frequency detection and locking request message packet is shown in table 11:

TABLE 11

The frequency detection and locking request response message comprises a message transmitting end name, a frequency locking response signal, a primary coil maximum allowable current value, a primary coil minimum allowable current value and a primary coil current actual value, and the message packet parameter format of the frequency detection and locking request response message is shown in table 12:

table 12

The message for successfully confirming the frequency locking of the vehicle-mounted terminal equipment comprises a message transmitting terminal name, a result identifier and a primary coil current instruction value locked in a frequency detection and locking link, and the parameter format of the message packet of the successfully confirming the frequency locking of the vehicle-mounted terminal equipment is shown in a table 13:

TABLE 13

The ground end equipment frequency locking success confirmation message comprises a message transmitting end name, a primary coil current actual value locked in a frequency detection and locking link, and a message packet parameter format of the ground end equipment frequency locking success confirmation message is shown in a table 14:

TABLE 14

The charging transmission stage comprises a charging starting request link and a power transmission link which are sequentially executed;

as shown in fig. 8, the communication method for starting the charge request phase includes a first embodiment, and a specific method of the first embodiment is as follows:

The IVU of the vehicle-mounted equipment sends a charging starting request message to the CSU of the ground equipment, the CSU judges whether the charging starting request message is received, if the CSU does not receive the charging starting request message within a set time, the CSU sends a ground terminal error message, when the CSU receives the charging starting request message, the IVU sends a charging starting request response message, the IVU judges whether the charging starting request response message is received, if the IVU does not receive the charging starting request response message within the set time from the charging starting request message is sent, the IVU sends a vehicle terminal error message, when the IVU receives the charging starting request response message, whether a response mark is successful is further judged, if the response mark is unsuccessful, a result failure message is sent, and if the response mark is successful, the charging starting request is ended;

the start charging request message includes a message transmitting end name, a start type, and a parameter format of a start charging request message packet, as shown in table 15:

TABLE 15

The start charging request response message comprises a message transmitting end name and a response result identifier, and the parameter format of the message packet of the start charging request response message is shown in table 16:

table 16

As shown in fig. 9, the communication method in the charging request phase further includes a second scheme, and the specific method in the second scheme is as follows:

The IVU of the vehicle-mounted equipment sends a charging starting request message to the CSU of the ground equipment, the CSU judges whether the charging starting request message is received, if the CSU does not receive the charging starting request message within a set time, the CSU sends a ground end error message, when the CSU receives the charging starting request message, the IVU sends a charging starting request response message, the IVU judges whether the charging starting request response message is received, if the charging starting request message is sent, the IVU does not receive the charging starting request response message within the set time, the IVU sends a vehicle end error message, when the IVU receives the charging starting request response message, whether a response mark is successful is further judged, if the charging starting request message is not successful, if the IVU further judges whether the set time is exceeded since the charging starting request message is sent, if the set time is exceeded, the result is failed, if the set time is not exceeded, the starting step is returned, and if the response mark is successful, the charging starting request is ended;

the charging start request message includes a message transmitting end name, a starting type, specific parameters, a format and a content reference table 15;

the start charge request response message includes a message transmitting end name, a response result identifier, specific parameters, a format, and a content reference table 16.

As shown in fig. 10, the communication method in the power transmission stage includes a first scheme, and a specific method of the first scheme is as follows:

the IVU of the vehicle-mounted equipment sends a charging demand message to the CSU of the ground equipment, the CSU judges whether the charging demand message is received or not, if the CSU does not receive the charging demand message within a set time from the moment of sending a charging request response message, the CSU sends a ground end error message, when the CSU receives the charging demand message, the IVU sends a charging state information message to the IVU, the IVU judges whether the charging state information message is not received by the IVU, if the charging demand message is sent, the IVU does not receive the charging state information message within the set time, the IVU sends a vehicle end error message, when the IVU receives the charging state information message, the IVU further judges whether the actual value of the primary coil current reaches more than 95% of an instruction value, if the IVU receives the charging demand message, the system output is judged whether the whole vehicle demand is met, if the system output is met, the primary coil current instruction value in the charging demand message is kept, and the starting step is returned, if the primary coil current instruction value is not met, the primary coil current is continuously adjusted, the primary coil current instruction value is returned to the starting step, if the primary coil current instruction value in the charging demand message is kept, the primary coil current instruction value is not met, the primary coil current instruction value is returned to the starting step;

The charging demand message comprises a message transmitting end name and a primary coil current instruction value, and the message packet parameter format of the charging demand message is shown in table 17;

TABLE 17

The charging state information message comprises a message transmitting end name, a primary coil maximum allowable current value, a primary coil minimum allowable current value, a received primary coil current instruction value, a primary coil current actual value and an input power value of ground end equipment, and the charging state information message packet parameter format is shown in table 18:

TABLE 18

As shown in fig. 11, the communication method in the power transmission stage further includes a second scheme, and the specific method of the second scheme is as follows:

the method comprises the steps that an IVU of a vehicle-mounted device increases a primary coil current instruction value on the basis of a frequency detection and locking phase link, sends a charging demand message to a CSU of the ground device, synchronously adjusts a rectifier, enters a charging state, judges whether the charging demand message is received or not, if the charging demand response message is sent, the CSU does not receive the charging demand message within a set time, sends a ground end error message, when the CSU receives the charging demand message, carries out current output, realizes electric energy transmission to the vehicle-mounted device, sends a charging state information message to the IVU, judges whether the charging state information message is not received from the moment of sending the charging demand message, if the charging demand message is sent, then sends the vehicle end error message, further judges whether the system output meets the whole vehicle requirement, if the charging demand response message is not, continues to increase the primary coil current instruction value, returns to a step of sending the charging demand message, if the charging demand message is started, then judges whether the optimal efficiency searching is started and the optimal efficiency is not met, if the current demand of the complete system is not met, if the current demand of the complete system is not met, and if the current demand of the complete system is changed, and if the current demand of the current is not met is changed, and the current is always meets the optimal value is adjusted;

Efficiency is a very critical technical index of the wireless charging system of the electric automobile; when the system outputs at rated power, the system may operate at different working points, i.e. be in alignment or various allowable offset states in the vertical direction and the horizontal direction, and the corresponding system efficiencies are different; therefore, for a practical wireless charging system of an electric automobile, efficiency optimization is preferably performed in the power transmission process.

The charging demand message comprises a message transmitting end name, a primary coil current instruction value, specific parameters, a format and a content reference table 17;

the charge state information message includes a message transmitting end name, a primary coil maximum allowable current value, a primary coil minimum allowable current value, a received primary coil current instruction value, a primary coil current actual value, an input power value of ground end equipment, specific parameters, a format and a content reference table 18.

As shown in fig. 12, in the charge stopping phase, when the vehicle-mounted device fails or reaches a set value or is actively initiated by a user, the IVU initiates a charge stopping request, and a specific communication method is as follows:

the IVU sends an IVU charge stopping message to the CSU, the CSU judges whether the IVU charge stopping message is received or not, if the IVU charge stopping message is not received or a vehicle side charge statistics data message is not received within a set time from the moment of sending the CSU charge stopping message, the CSU sends a ground side error message, when the CSU receives the IVU charge stopping message, the CSU initiates stopping of charging to the PTC and sends the IVU charge stopping message to the IVU, if the IVU charge stopping message is not received in the set time from the moment of sending the IVU charge stopping message, the IVU sends a vehicle side error message, when the IVU receives the CSU charge stopping message, whether the actual value of the primary side coil current is smaller than the set value or not is further judged, if the IVU charge stopping message is not received, the primary side coil current command value is reduced, and the process returns to the starting step, if the IVU stops power transmission and the charging is stopped;

The IVU charge stopping message comprises a message transmitting end name, a primary coil current instruction value, a non-system fault reason for the IVU to stop charging normally, a non-system fault reason for the IVU charge stopping system, and a message packet parameter format of the IVU charge stopping message is shown in a table 19;

TABLE 19

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The CSU charge stopping message comprises a message transmitting end name, a primary coil current actual value, a CSU normal stop charge, a CSU charge stopping non-system fault reason and a CSU charge stopping system fault reason, and the parameter format of the CSU charge stopping message packet is shown in a table 20:

table 20

As shown in fig. 13, in the charging stop phase, when the ground end device fails or the user initiates actively, the CSU initiates a charging stop request, and the specific communication method is as follows:

the method comprises the steps that a CSU sends a CSU charge stopping message to an IVU and synchronously initiates charging stopping to a PTC, the IVU judges whether the CSU charge stopping message is received or not, when the IVU receives the CSU charge stopping message, the IVU sends the IVU charge stopping message to the CSU, if the IVU charge stopping message is sent, in a set time, the CSU does not receive the IVU charge stopping message or a vehicle side charge statistics data message, the CSU sends a ground side error message, when the CSU receives the IVU charge stopping message, the CSU charge stopping message is sent, the IVU judges whether the CSU charge stopping message is received or not, if the IVU charge stopping message is sent, in the set time, the IVU charge stopping message is not received, the vehicle side error message is sent, if the CSU charge stopping message is received, the actual value of a primary coil current is smaller than a set value is further judged, if the primary coil current instruction value is reduced, the IVU charge stopping message is sent, and if the IVU charge stopping is stopped, and the power transmission of the IVU charge stopping step is finished;

The IVU charge suspension message includes a message transmitting end name, a primary coil current instruction value, a non-system fault reason for IVU charge suspension, a specific content, parameters and a format reference table 19;

the CSU charge suspension message includes a message transmitting end name, a primary coil current actual value, a CSU normal stop charge, a CSU charge suspension non-system fault cause, a CSU charge suspension system fault cause, and specific contents, parameters, and a format reference table 20 of the message.

As shown in fig. 14, the communication method of the charging data of the charging process between the IVU and the CSU is as follows:

the IVU sends a vehicle-end charging statistics data message to the CSU, the CSU sends a ground-end charging statistics data message to the IVU after receiving the request message, the IVU judges whether the ground-end charging statistics data message is received or not, if the ground-end charging statistics data message is not received within a set time from the moment of sending the IVU to stop charging the charging message, the vehicle-end error message is sent, and if the ground-end charging statistics data of the vehicle end are received, the vehicle-end charging statistics are ended;

the CSU sends a ground terminal charging statistics data message to the IVU, and meanwhile, further judges whether the vehicle terminal charging statistics data message is received or not, if the vehicle terminal charging statistics data message is not received within a set time from the time of sending the CSU stopping charging message, the ground terminal error message is sent, and if the vehicle terminal charging statistics data message is received, the ground terminal charging data statistics is finished;

The vehicle-side charging statistics data message includes a message transmitting end name, a single-time charging direct current output energy, and a suspension state of charge SOC, and a vehicle-side charging statistics data message packet parameter format is shown in table 21:

table 21

The ground terminal charging statistics data message comprises a message transmitting terminal name, accumulated charging time and single charging alternating current consumption electric energy, and the parameter format of the ground terminal charging statistics data message is shown in a table 8:

table 22

In the charging process, when the IVU or the CSU detects that communication timeout exists, an error message is sent, including:

error message at vehicle end:

Ground end error message:

failure result message:

when the IVU detects that a certain communication link fails to be completed normally, a result failure message is sent to the CSU, wherein the content comprises a message transmitting end name, a compatibility detection pre-detection failure, an initial foreign matter detection link timeout, a foreign matter detection link detection failure, an initial alignment detection failure, an initial living body protection link timeout, a living body detection link detection living body, a frequency detection and locking failure, a start charging request failure and a stop charging failure.

The method also comprises a fault processing method in the whole charging process, and the fault processing modes are divided into a plurality of modes according to the severity level of the fault, including but not limited to:

Mode a) -automatic recovery. And ending the current charging flow, and jumping to a charging connection state. And reestablishing WIFI connection between the IVU and the CSU according to the message content, or reporting the information of the replacement parking space and the like.

Mode b), if the current charging is not affected, performing cold treatment, i.e. no operation is performed, and performing equipment maintenance after the charging is finished.

Mode c) -immediately stopping the current charge. If the IVU detects the fault, the IVU initiates abnormal stopping of charging; if the CSU detects the fault, the CSU initiates abnormal stopping of charging.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. The wireless charging communication method for the electric automobile is characterized by comprising the following steps of:

The communication method of the initial alignment detection comprises a communication method aiming at an LPE scheme, and specifically comprises the following steps:

the IVU sends an initial alignment detection request message to the CSU, requests to start an LPE signal, the CSU judges whether the initial alignment detection request message is received or not, if the initial alignment detection request message is not received by the CSU within a set time from the initial foreign matter detection request response message is sent, the CSU sends a ground terminal error message;

when the CSU receives the initial alignment detection request message, generating current according to the primary coil current instruction value, and sending an initial alignment detection request response message to the IVU, if the IVU does not receive the initial alignment detection request response message within a set time from the initial alignment detection request message, the IVU sends a vehicle end error message;

when the IVU receives the initial alignment detection request response message, carrying out initial alignment detection calculation, judging whether the initial alignment detection is passed or not after calculation, if not, further carrying out initial alignment detection calculation, if not, sending a result failure message within a set time from the initial alignment detection calculation, if so, sending an initial alignment detection request message to the CSU, requesting to stop the LPE signal, and further judging whether the initial alignment detection request message is received or not by the CSU;

If the initial alignment detection request response message is sent, the ground end error message is sent in a set time when the initial alignment detection request message is not received, if the initial alignment detection request message is received by the CSU, the primary coil current is stopped, the initial alignment detection request response message is sent to the IVU, the IVU judges whether the initial alignment detection request response message is received or not, if the initial alignment detection request response message is not received in the set time, the vehicle end error message is sent, if the initial alignment detection request message is received, whether the LPE signal is stopped is further judged, if the initial alignment detection request message stopping the LPE signal is sent in the set time, the initial alignment detection is stopped, the result failure message is sent, and if the initial alignment detection is stopped;

charging transmission stage: in the stage, the IVU sends a charging requirement to the CSU in real time, and the CSU adjusts output power according to the charging requirement, wherein the charging requirement and the power transmission communication interaction process are started;

2. The wireless charging communication method of an electric vehicle according to claim 1, wherein the communication method of the charging connection stage is as follows:

wherein the registration authentication is an optional communication link.

3. The electric vehicle wireless charging communication method according to claim 1, wherein the communication method of the compatibility detection pre-check is: the compatibility detection pre-detection request message and the compatibility detection pre-detection request response message are used as communication messages, and the communication messages are circulated between the IVU of the vehicle-mounted equipment and the CSU of the ground equipment, so that the compatibility detection pre-detection of the vehicle-mounted equipment and the ground equipment is realized;

4. The electric vehicle wireless charging communication method according to claim 3, wherein:

the compatibility detection pre-detection request message comprises a message transmitting end name, a vehicle-mounted end device power grade, a vehicle-mounted end device resonance compensation circuit topology, a vehicle-mounted end device coil type, a vehicle-mounted end device ground clearance grade, a vehicle-mounted end device foreign matter detection method, a vehicle-mounted end device living body protection method, a vehicle-mounted end device alignment detection method, a vehicle-mounted end device output voltage maximum value and a vehicle-mounted end device output current maximum value;

5. The electric vehicle wireless charging communication method according to claim 3, wherein:

the communication method of the initial alignment detection also comprises a communication method aiming at the LF scheme;

6. The electric vehicle wireless charging communication method according to claim 3, wherein:

when the compatibility detection pre-detection communication is executed, the IVU of the vehicle-mounted equipment needs to send a compatibility detection pre-detection request message to the CSU, the CSU needs to judge whether the compatibility detection pre-detection request message is received or not, if the communication is established between the IVU and the CSU, the compatibility detection pre-detection request message is not received within a set time, and the CSU sends a ground end error message;

7. The electric vehicle wireless charging communication method according to claim 1, characterized in that: the charging transmission stage comprises a charging starting request link and a power transmission link which are sequentially executed;

8. The electric vehicle wireless charging communication method according to claim 7, wherein: in the charging stopping stage, when the IVU initiates a charging stopping request and the CSU initiates a charging stopping request, an IVU charging stopping message and a CSU charging stopping message are adopted as communication messages, and circulation is carried out between the IVU of the vehicle-mounted equipment and the CSU of the ground equipment, so that interaction when the IVU or the CSU initiates the charging stopping request is realized;

9. The electric vehicle wireless charging communication method according to claim 7, wherein: in the charge stopping stage, the communication method of the charge data statistics comprises the following steps: taking the vehicle-side charging statistics data message and the ground-side charging statistics data message as communication messages, and circulating between the IVU of the vehicle-mounted equipment and the CSU of the ground equipment to realize charging data statistics after stopping charging;

10. The electric vehicle wireless charging communication method according to claim 1, characterized in that: in the whole charging process, when the IVU or the CSU detects the communication timeout, an error message is sent, including:

error message at vehicle end:

ground end error message:

Failure result message:

automatic recovery: ending the current charging flow, jumping to a charging connection state, and reestablishing WIFI connection between the IVU and the CSU according to the message content, or reporting information of changing parking spaces and the like;