CN111193651A

CN111193651A - Method and device for improving CAN message data transmission utilization rate and storage medium

Info

Publication number: CN111193651A
Application number: CN201911295712.XA
Authority: CN
Inventors: 张延良; 李升建; 苏敏; 梁雪涛; 刘明
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-05-22

Abstract

The invention discloses a method for improving the transmission utilization rate of CAN message data, which comprises the following steps: acquiring message data to be sent, splitting a next frame of message according to the difference value between the length of the current message and the preset length, combining the current message and the next frame of message into a new message with the preset length, and acquiring the preprocessed message data. By the method, all bytes of the CAN message CAN be fully utilized, and the utilization rate of CAN message data transmission is improved. The invention also discloses a device for improving the CAN message data transmission utilization rate and a storage medium.

Description

Method and device for improving CAN message data transmission utilization rate and storage medium

Technical Field

The invention relates to the technical field of automobile communication, in particular to a method and a device for improving the transmission utilization rate of CAN message data and a storage medium.

Background

With the rapid development of scientific technology, the intelligent system in the automobile is also increased rapidly, which leads to the dramatic increase of the information amount of communication in the automobile, the transmission capacity of the CAN communication network used in the automobile is only 500Kbps-1MKbps, but in the message transmission process of the actual CAN communication network, a lot of message data are transmitted, which easily causes overload transmission, and leads to the problems of CAN message error, delay and the like.

At present, when a CAN communication network is used for data transmission, all bytes of a CAN message cannot be fully utilized, so that the data transmission utilization rate of the CAN message is not high.

Disclosure of Invention

The embodiment of the disclosure provides a method and a device for improving the transmission utilization rate of CAN message data and a storage medium. The following presents a simplified summary in order to provide a basic understanding of some aspects of the disclosed embodiments. This summary is not an extensive overview and is intended to neither identify key/critical elements nor delineate the scope of such embodiments. Its sole purpose is to present some concepts in a simplified form as a prelude to the more detailed description that is presented later.

In some optional embodiments, a method for improving a transmission utilization rate of CAN packet data includes:

acquiring message data to be sent;

and splitting the next frame of message according to the difference value between the length of the current message and the preset length, combining the current message and the next frame of message into a new message with the preset length, and obtaining the preprocessed message data.

Optionally, the method further comprises:

and transmitting the preprocessed message data to an automobile INCA calibration platform.

Optionally, the method further comprises:

and detecting the length of each frame of message.

Optionally, the message data includes:

variable name, variable address, variable length and acquisition period.

Optionally, the preset length is 7 bytes.

In some optional embodiments, an apparatus for improving a utilization rate of CAN packet data transmission includes:

the acquisition module is used for acquiring message data to be sent;

and the splitting and combining module is used for splitting the next frame of message according to the difference value between the length of the current message and the preset length, combining the current message and the next frame of message into a new message with the preset length, and acquiring the preprocessed message data.

Optionally, the method further comprises:

and the sending module is used for transmitting the preprocessed message data to the vehicle INCA calibration platform.

Optionally, the method further comprises:

and the detection module is used for detecting the length of each frame of message.

In some optional embodiments, an apparatus for improving a utilization rate of CAN packet data transmission includes: the CAN message transmission method is characterized in that the processor is configured to execute the method for improving the CAN message data transmission utilization rate provided by the embodiment when executing the program instruction.

In some optional embodiments, a computer readable medium has computer readable instructions stored thereon, and the computer readable instructions are executable by a processor to implement a method for improving the utilization rate of CAN message data transmission provided in the above embodiments.

The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:

the invention divides the next frame of message according to the difference value between the length of the current message and the preset length by obtaining the message data to be sent, combines the current message and the next frame of message into a new message with the preset length, fills each CAN data frame, fully utilizes all bytes of the CAN message and improves the utilization rate of CAN message data transmission.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.

Fig. 1 is a schematic flow chart illustrating a method for improving a transmission utilization rate of CAN message data according to an exemplary embodiment;

fig. 2 is a schematic diagram illustrating an apparatus for improving the utilization of CAN message data transmission according to an exemplary embodiment;

fig. 3 is a schematic diagram illustrating an apparatus for improving the utilization of CAN message data transmission according to an exemplary embodiment;

fig. 4 is a schematic diagram illustrating an apparatus for improving a utilization rate of CAN packet data transmission according to an exemplary embodiment.

Detailed Description

So that the manner in which the features and elements of the disclosed embodiments can be understood in detail, a more particular description of the disclosed embodiments, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. In the following description of the technology, for purposes of explanation, numerous details are set forth in order to provide a thorough understanding of the disclosed embodiments. However, one or more embodiments may be practiced without these details. In other instances, well-known structures and devices may be shown in simplified form in order to simplify the drawing.

In some exemplary scenarios, the vehicle INCA calibration platform receives a vehicle ECU (Electronic control Unit)_，Electronic control unit), and the automobile ECU sends the variables to an automobile INCA calibration platform through an on-board CAN bus, at present, the maximum effective byte supported by one message in the on-board CAN bus is 7 bytes, but in the transmission process, one frame of data does not need to use 7 bytes, so that all bytes of the CAN message cannot be fully utilized, the frame number of the CAN message to be sent CAN be increased, and the load of the bus is increased.

Fig. 1 is a flowchart illustrating a method for improving a transmission utilization rate of CAN message data according to an exemplary embodiment;

in some embodiments, a method for improving a utilization rate of CAN message data transmission includes:

step S101, obtaining message data needing to be sent;

step S102, according to the difference value between the length of the current message and the preset length, the next frame of message is split, the current message and the next frame of message are combined into a new message with the preset length, and the preprocessed message data is obtained.

In some exemplary scenarios, the acquired message data to be sent is as follows:

TABLE 1

Variable names	Variable address	Variable length	Acquisition cycle
				VAR1	ADDR1	4	10ms
VAR2	ADDR2	4	10ms
				VAR3	ADDR3	4	10ms
VAR4	ADDR4	4	10ms
				VAR5	ADDR5	4	10ms
VAR6	ADDR6	4	10ms
				VAR7	ADDR7	4	10ms
VAR8	ADDR8	4	10ms
				VAR9	ADDR9	4	10ms
VAR10	ADDR10	4	10ms
				VAR11	ADDR11	2	10ms
VAR12	ADDR12	2	10ms
				VAR13	ADDR13	2	10ms
VAR14	ADDR14	1	10ms

The content of each frame of CAN message is as follows:

PID

0

1

2

3

4

5

6

PID represents the serial number of the report message, BYTE [0] -BYTE [6] total 7 BYTEs of data, namely, each frame of message reports 7 BYTEs of effective data at most.

If the configuration is performed according to the sequence in table 1, the message mode reported by the ECU is as follows:

in this case, each frame of CAN message CAN only report 4 bytes of data, so that each frame of CAN message has 3 bytes of idle, and cannot fully utilize all bytes of CAN message, and the number of frames reported by ECU is limited by upper limit, in some exemplary scenarios, ECU reports 10 frames of message at most, and the total number of frames of message in table is 14 frames, which exceeds the total number of frames of reported message, and control bytes of CAN message are wasted.

In the embodiment of the present disclosure, the message data obtained in the first-time table is reordered, the next-frame message is split according to the difference between the length of the current message and the preset length, the current message and the next-frame message are combined into a new message with the preset length, and the preprocessed message data is obtained.

Each frame message reports valid data of 7 bytes at most, so the preset length is 7 bytes.

The preprocessed message data are shown in table 2, the variable length of the variable 1 is 4, the difference between the variable length and the preset length is 3 bytes, the variable length of the variable 2 is 4 bytes, the variable 2 is split into 3 bytes and 1 byte according to the difference 3 between the variable 1 and the preset length, and the 4 bytes of the variable 1 and the 3 bytes of the variable 2 are combined into one frame of message data, so that the bytes of each frame of message CAN be fully utilized, and the utilization rate of CAN message data transmission is improved.

The variable 2 still has 1 byte left, continue to split the combination downwards, the variable 3 has 4 bytes, the remaining byte of the variable 2 plus the byte of the variable 3 has 5 bytes in total, and the length of the byte is 2 bytes different from the preset length, and then split 2 bytes from the variable 4 to form 7 bytes in total, therefore, the remaining byte length of the variable 2 and the length of all 4 bytes of the variable 3 plus the length of 2 bytes of the variable 4 are used as a new message of a frame, and the subsequent variables are continuously processed by the same method until all variables are processed, and it can be known from table 2 that 14 groups of variables are transmitted by 7 frames of messages in total. The utilization rate of CAN message transmission is greatly improved.

TABLE 2

After splitting and combining according to the method of table 2, the message method reported by the ECU is as follows:

by the method, the bytes of the CAN message CAN be fully utilized, the utilization rate of CAN message data transmission is improved, and the variable which CAN be collected is increased.

Optionally, the method further comprises:

The calibration platform of the automobile INCA is a calibration tool and software of an automobile controller, the calibration platform of the automobile INCA collects and records various data and signals such as rotating speed, vehicle speed, accelerator and brake generated when an ECU runs, the working state of each executing mechanism is controlled through received sensor and switch signals, and then the running state of the automobile is determined, and the calibration means that the dynamic property, the economical efficiency, the emission, the comfort and the like of the automobile can reach the optimal state by adjusting control parameters.

The ECU transmits the preprocessed CAN message to the automobile INCA calibration platform through a CAN bus, and the automobile INCA calibration platform controls the working state of the automobile through data transmitted by the ECU.

Optionally, the method further comprises:

and detecting the length of each frame of message.

The length of each frame of message is detected, the next frame of message is split according to the difference value between the length of the current message and the preset length, the current message and the next frame of message are combined into a new message with the length being the preset length, and the preprocessed message data are obtained.

Optionally, the message data includes: variable name, variable address, variable length and acquisition period.

Optionally, the preset length is 7 bytes.

Each frame of message reports effective data of 7 bytes at most, so the preset length is 7 bytes, and the utilization rate of each frame of message can be improved and the frame number of the transmitted message can be increased by completely filling 7 bytes of each frame of message.

Fig. 2 is a schematic diagram illustrating an apparatus for increasing the transmission utilization of CAN message data according to an exemplary embodiment.

In some embodiments, an apparatus for improving CAN message data transmission utilization includes:

s201, an obtaining module, configured to obtain message data to be sent;

s202, a splitting and combining module, configured to split a next frame of message according to a difference between a length of a current message and a preset length, combine the current message and the next frame of message into a new message with a preset length, and obtain preprocessed message data.

Optionally, the method further comprises:

Fig. 3 is a schematic diagram illustrating an apparatus for increasing the transmission utilization of CAN message data according to an exemplary embodiment.

s301, an obtaining module for obtaining message data to be sent;

and S302, a splitting and combining module, configured to split the next frame of message according to a difference between the length of the current message and a preset length, combine the current message and the next frame of message into a new message with a preset length, and obtain preprocessed message data.

And S303, a sending module for transmitting the preprocessed message data to an automobile INCA calibration platform.

S304, a detection module for detecting the length of each frame of message.

Fig. 4 is a schematic diagram illustrating an apparatus for increasing the transmission utilization rate of CAN message data according to an exemplary embodiment

In some embodiments, an apparatus for improving the transmission utilization of CAN message data includes a processor 41 and a memory 42 storing program instructions, and may further include a communication interface 43 and a bus 44. The processor 41, the communication interface 43, and the memory 42 may communicate with each other via a bus 44. The communication interface 43 may be used for information transfer. The processor 41 may call the logic instructions in the memory 42 to execute the method for improving the transmission utilization of the CAN message data provided by the above embodiment.

Furthermore, the logic instructions in the memory 42 may be implemented in software functional units and stored in a computer readable storage medium when sold or used as a stand-alone product.

The memory 42 is a computer-readable storage medium, and can be used for storing software programs, computer-executable programs, such as program instructions/modules corresponding to the methods in the embodiments of the present disclosure. The processor 41 executes the functional application and data processing by executing the software program, instructions and modules stored in the memory 42, that is, implements the method in the above-described method embodiment.

The memory 42 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of the terminal device, and the like. Further, the memory 42 may include a high speed random access memory and may also include a non-volatile memory.

The embodiment of the present disclosure provides a device for increasing the transmission utilization rate of CAN message data, which includes a memory 42 and a processor 41;

the memory 42 has stored therein executable program code;

the processor 41 reads the executable program code and runs the program corresponding to the executable program code, so as to implement the method for improving the transmission utilization rate of the CAN message data provided by the above embodiment.

The embodiment of the present disclosure provides a computer-readable medium, on which computer-readable instructions are stored, where the computer-readable instructions CAN be executed by a processor to implement the method for improving the transmission utilization of CAN message data provided in the foregoing embodiment.

The computer-readable storage medium described above may be a transitory computer-readable storage medium or a non-transitory computer-readable storage medium.

Those of skill in the art would appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software may depend upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the disclosed embodiments. It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the unit described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.

In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, apparatuses, etc.) may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit may be merely a division of a logical function, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form. Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to implement the present embodiment. In addition, functional units in the embodiments of the present disclosure may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit.

The flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). In some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. Each block of the block diagrams and/or flowchart illustrations, and combinations of blocks in the block diagrams and/or flowchart illustrations, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

The above description is only for the preferred embodiment of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for improving the transmission utilization rate of CAN message data is characterized by comprising the following steps:

acquiring message data to be sent;

2. The method of claim 1, further comprising:

3. The method of claim 1, further comprising:

and detecting the length of each frame of message.

4. The method of claim 1, wherein the message data comprises:

variable name, variable address, variable length and acquisition period.

5. The method according to any one of claims 1 to 4, wherein the predetermined length is 7 bytes.

6. The utility model provides a promote device of CAN message data transmission utilization ratio which characterized in that includes:

the acquisition module is used for acquiring message data to be sent;

7. The apparatus of claim 6, further comprising:

and the sending module is used for transmitting the preprocessed message data to an automobile INCA calibration platform.

8. The apparatus of claim 6, further comprising:

9. The utility model provides a promote device of CAN message data transmission utilization ratio which characterized in that includes: a processor and a memory storing program instructions, wherein the processor is configured to perform the method of increasing CAN message data transmission utilization according to any one of claims 1 to 5 when executing the program instructions.

10. A computer readable medium having computer readable instructions stored thereon, the computer readable instructions being executable by a processor to implement a method of increasing CAN message data transmission utilization according to any one of claims 1 to 5.