CN113727461A - Ad-hoc network flashing method of automobile assembly production line - Google Patents
Ad-hoc network flashing method of automobile assembly production line Download PDFInfo
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- CN113727461A CN113727461A CN202110851732.1A CN202110851732A CN113727461A CN 113727461 A CN113727461 A CN 113727461A CN 202110851732 A CN202110851732 A CN 202110851732A CN 113727461 A CN113727461 A CN 113727461A
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- H—ELECTRICITY
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Abstract
The invention relates to the field of vehicle flashing, in particular to an ad hoc network flashing method of an automobile assembly production line. The method specifically comprises the following steps: step S1, the communication node constructs an access relation with at least one vehicle node in advance, and issues a flash data packet; step S2, the vehicle nodes which receive the flash data packet are used as access nodes, and for each access node, an access relation is established between the access node and the vehicle node which can inquire the access node and the flash data packet is issued; and step S3, circularly executing the step S2 until all vehicle nodes establish access relations and receive the flash data packet. The technical scheme of the invention has the beneficial effects that: the method for flashing the ad hoc network of the automobile assembly production line is provided, a flashing data packet is quickly and accurately transmitted to a vehicle for vehicle upgrading flashing, the flashing speed is improved, the flashing period is shortened, the economic cost is reduced, the method is suitable for large-scale vehicle upgrading flashing before leaving a factory, and the method has a wide application range.
Description
Technical Field
The invention relates to the field of vehicle flashing, in particular to an ad hoc network flashing method of an automobile assembly production line.
Background
In order to enrich the performance of automobiles and improve the competitiveness, more and more functions can be realized by electronic components in automobiles, and accordingly, the integration of project coordinating the whole automobiles becomes more and more complicated, but in order to shorten the delivery cycle and improve the delivery rate, the whole automobile factories need to compress the project implementation cycle of part suppliers. Therefore, the situation that production is already implemented in a factory when relevant software of parts is not completely stable necessarily occurs, that is, even if some parts are loaded, the control software of the parts is not yet in a stable version, and in order to solve the problem, technicians often additionally add a procedure of updating software or marking and writing the automobile before the final procedure of automobile assembly or the automobile leaves a factory.
For realizing the process, the existing factory often adopts a manual flashing mode, namely, an operator holds a certain number of diagnosis flashing tools and inserts the diagnosis flashing tools into a diagnosis interface of an automobile to flash the automobile, and in the flashing process, the operator needs to observe the working state of the flashing instrument in time, and after one automobile is flashed, the operator needs to be removed in time and inserts the flashing interface of another automobile.
However, the number of electronic software to be written on each car is large, which results in a long writing period, which is contrary to the purpose of shortening the delivery cycle, and a certain number of writing devices need to be purchased to perform parallel writing, which additionally increases the economic cost, reduces the delivery profit, and also has the risk of failing to achieve the delivery efficiency that the production line is expected to achieve.
The prior art cannot meet the current industry requirements, and data shows that the proportion of electronic parts in the automobile industry in 2019 reaches 35%, and more than 50% of the proportion of electronic parts is daily available, so that the proportion of software is inevitably improved by the high-proportion electrons, and the proportion of time required by software flashing in the total period is higher and higher in the automobile production process, so that a method for flashing the automobile quickly, accurately and conveniently is urgently needed.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides an ad hoc network flashing method of an automobile assembly production line, which is applied to a plurality of vehicle nodes to be flashed and communication nodes, wherein effective flashing data packets are configured in the communication nodes in advance;
the ad hoc network flash method comprises the following steps:
step S1, the communication node constructs an access relation with at least one vehicle node in advance, and issues the flash data packet;
step S2, the vehicle nodes which receive the flash data packets are used as access nodes, and for each access node, an access relation is respectively established between the vehicle node and the vehicle node which can inquire the access node, and the flash data packets are issued;
and step S3, circularly executing the step S2 until all the vehicle nodes establish access relations and the flash data packet is received.
Preferably, in step S1, the communication node selects a vehicle node with the highest signal strength with the communication node from all the vehicle nodes and constructs an access relationship.
Preferably, step S2 includes:
step S21, searching the vehicle node which does not receive the flash data packet and using the vehicle node as an on-demand node, searching the access node which has received the flash data packet in the communication range of the on-demand node, and establishing the access relation between the access node and the on-demand node;
step S22, the access node issues the flash data packet to the corresponding on-demand node;
and step S23, the on-demand node receives the flash data packet and updates the received on-demand node into the access node.
Preferably, in step S21, when there are a plurality of access nodes in the communication range to which the on-demand node belongs, the access node with the greatest signal strength and having the complete flash packet with the on-demand node is selected from the access nodes, and an access relationship is established.
Preferably, in step S22, before the access node issues the flush packet, the method further includes:
the access node divides the flash data packet sent to each on-demand node in advance according to the signal strength of all the accessed on-demand nodes, generates a plurality of data blocks of types corresponding to the signal strength, and sends the data blocks of the corresponding types to the corresponding on-demand nodes.
Preferably, the sizes occupied by the data blocks of different types are different, and the sum of the data blocks of each type constitutes the data packet.
Preferably, a key is set between the access node and each accessed on-demand node, and the access node encrypts the data block sent to the access node by using the key.
Preferably, in step S22, in the process of issuing the flash packet by the access node, the method further includes:
setting the access node to perform the flash upgrading according to the flash data packet, and sending the flash data packet to the priority of the on-demand node by the access node;
and the access node allocates the IO interface of the access node according to the corresponding priority.
Preferably, in step S22, in the process of issuing the flash packet by the access node, the method further includes:
and adjusting the priority of the access node for issuing the flash data packet to the on-demand node according to the signal strength between the on-demand node and the access node.
The technical scheme has the following advantages or beneficial effects: the method for flashing the ad hoc network of the automobile assembly production line is provided, a flashing data packet is quickly and accurately transmitted to a vehicle for vehicle upgrading flashing, the flashing speed is improved, the flashing period is shortened, the economic cost is reduced, the method is suitable for large-scale vehicle upgrading flashing before leaving a factory, and the method has a wide application range.
Drawings
Fig. 1 is a schematic overall flow chart of an ad hoc network flashing method of an automobile assembly production line according to a preferred embodiment of the present invention;
FIGS. 2(a) - (d) are schematic diagrams illustrating the access process of the ad hoc network according to the preferred embodiment of the present invention;
FIG. 3 is a flowchart illustrating the step S2 according to the preferred embodiment of the present invention;
fig. 4 is a schematic diagram illustrating an access node dividing a flash packet and issuing the flash packet to an optional node according to a preferred embodiment of the present invention;
fig. 5 is a schematic diagram illustrating an IO interface allocated by an access node according to a preferred embodiment of the present invention;
fig. 6(a) - (c) are schematic diagrams illustrating the access node adjusting the priority according to the signal strength between the on-demand nodes in the preferred embodiment of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The present invention is not limited to the embodiment, and other embodiments may be included in the scope of the present invention as long as the gist of the present invention is satisfied.
In a preferred embodiment of the present invention, based on the above problems in the prior art, an ad hoc network flashing method for an automobile assembly production line is provided, which is applied to a plurality of vehicle nodes and communication nodes to be flashed, and effective flashing data packets are configured in advance in the communication nodes;
as shown in fig. 1, the ad hoc network flash method includes:
step S1, the communication node constructs an access relation with at least one vehicle node in advance, and issues a flash data packet;
step S2, the vehicle nodes which receive the flash data packet are used as access nodes, and for each access node, an access relation is established between the access node and the vehicle node which can inquire the access node and the flash data packet is issued;
and step S3, circularly executing the step S2 until all vehicle nodes establish access relations and receive the flash data packet.
In a preferred embodiment of the present invention, in step S1, the communication node selects a vehicle node having the highest signal strength with the communication node from all vehicle nodes and constructs an access relationship.
Specifically, as shown in fig. 2(a) - (d), a router is selected as a communication node O in advance, a vehicle node a with the largest signal strength with the communication node O is selected from all vehicle nodes A, B, C, D, E, F, G and H, an access relationship is constructed, and a flash data packet is sent to the vehicle node a; then, taking the vehicle node A which has received the flash data packet as an access node, establishing access relations with the vehicle nodes B, C and D which can inquire the access node A respectively aiming at the access node A, and issuing the flash data packet; repeatedly executing, establishing access relations between the access nodes B, C and D which have received the flash data packets and vehicle nodes E, F and G which can inquire the access nodes B, C and D respectively, and issuing the flash data packets; and repeatedly executing, establishing an access relation between the access node F which has received the flash data packet and the vehicle node H which can inquire the access node F, and issuing the flash data packet.
In a preferred embodiment of the present invention, as shown in fig. 3, step S2 includes:
step S21, searching vehicle nodes which do not receive the flash data packet and using the vehicle nodes as random selection nodes, searching access nodes which receive the flash data packet in the communication range of the random selection nodes, and establishing the access relation between the access nodes and the random selection nodes;
step S22, the access node issues the flash data packet to the corresponding random access node;
and step S23, the on-demand node receives the flash data packet and updates the received on-demand node into the access node.
In a preferred embodiment of the present invention, in step S21, when there are multiple access nodes in the communication range to which the on-demand node belongs, an access node having the highest signal strength and a complete flush packet with the on-demand node is selected from the multiple access nodes, and an access relationship is established.
Specifically, when an access relationship between vehicle nodes is constructed, the vehicle nodes which do not receive the refresh data packet are searched and serve as random access nodes, which can also be called idle nodes, then the access nodes which have received the refresh data packet are searched in a communication range to which the random access nodes belong, the access node which has the highest signal strength with the random access nodes and has a complete refresh data packet is selected from the access nodes, and the access relationship is established, so that a subsequent process of issuing the refresh data packet is performed.
Further, in consideration of the network hierarchy setting of the ad hoc network, in the access relationship of the current hierarchy, the on-demand node receives the flash data packet, updates the received on-demand node as the access node, and repeatedly executes step S2, that is, returns to step S21, updates the received on-demand node as the access node, and continues to search for a vehicle node that does not receive the flash data packet as the on-demand node, so as to construct the access relationship of the next hierarchy.
In a preferred embodiment of the present invention, in step S22, before the issuing the flush packet by the access node, the method further includes:
the access node divides the flash data packet sent to each random access node in advance according to the signal intensity of all the random access nodes which are accessed, generates a plurality of data blocks corresponding to the type of the signal intensity, and sends the data blocks corresponding to the type to the corresponding random access nodes.
In a preferred embodiment of the present invention, the sizes of the different types of data blocks are different, and the sum of the data blocks of each type constitutes a data packet.
In the preferred embodiment of the invention, a key is set between the access node and each accessed random access node, and the access node uses the key to encrypt the data block sent to the access node.
Specifically, considering that the bus bandwidth is limited, before the access node issues the flush data packet, the flush data packet issued to the on-demand node is divided according to the signal strengths of all on-demand nodes accessing the access node, so as to generate a plurality of data blocks of types corresponding to the signal strengths, for example, when the on-demand nodes B, C and D are accessed to an access node a together, the signal strengths between the on-demand nodes B, C and D and the access node a are analyzed, if the signal strength between the on-demand node B and the access node a is the largest at this time, the on-demand node C is the next time, and the signal strength between the on-demand node D and the access node a is the weakest, the flush data packet is divided into larger data blocks and issued to the on-demand node B in different dividing manners, the same flush data packet is divided into medium data blocks and issued to the on-demand node C, and dividing the same flash data packet into smaller data blocks and sending the smaller data blocks to the optional node D. For large flash data packets, the block mode is adopted for transmission, and the checking efficiency and the transmission fault tolerance rate can be improved by different block sizes, so that the transmission efficiency is improved.
In a specific implementation process, as shown in fig. 4, an access node may select different fixed-length parameters according to different signal strengths of accessed optional nodes to divide a flash data packet into data blocks of different sizes, and then may perform packet assembly on the data blocks according to a data packet format, where the packet assembly process includes block indexing, data encryption, calculating data length to be transmitted, check information, and the like; then transmitting the message to the on-demand node; after receiving the message, the random selection node restores the message through the information in the message, and if the message information is consistent with the check information, the random selection node informs the access node to initiate the transmission of the next message; and if the message information is inconsistent with the check information, notifying the father node that the message information is invalid and needs to be retransmitted.
In a preferred embodiment of the present invention, in step S22, in the process of issuing the flash packet by the access node, the method further includes:
setting the priority of the access node for performing flash upgrading according to the flash data packet and issuing the flash data packet to the on-demand node;
and the access node allocates the IO interface of the access node according to the corresponding priority.
In a preferred embodiment of the present invention, in step S22, in the process of issuing the flash packet by the access node, the method further includes:
and adjusting the priority of issuing the flash data packet to the on-demand node by the access node according to the signal strength between the on-demand node and the access node.
As shown in fig. 5, considering that one access node a transmits data blocks to a plurality of accessed on-demand nodes B, C, and D, the access node a also needs to implement flush scheduling and a series of I/O operations for the ECU in the vehicle, which has a high requirement on the computation power of the system, and since the vehicle network has a small bandwidth and does not have QoS (Quality of service) capability, the vehicle network communication stability needs to be considered preferentially; an ad hoc network mode is adopted between the access node A and the on-demand nodes B, C and D, but one access node is simultaneously accessed to an indefinite number of on-demand nodes, and resource preemption among different nodes can cause that all nodes can not distribute proper resources, thereby causing low efficiency.
Therefore, the problem is solved by adopting an IO load balancing method, for example, for the access node a, the priority for upgrading and flashing the access node a itself is preset, because although a plurality of nodes are accessed in the vehicle, a sequential processing method is adopted, only one node is transmitted in each time period, so that only one node is accessed in the vehicle in an actual situation, the requirement on time delay for network transmission in the vehicle is strict, and the priority configuration is higher; then, setting the sending frequency of the access node A to the optional node B, and C and D and carrying out real-time dynamic adjustment, wherein if the current distance between the access node A and the optional node B becomes shorter as shown in FIG. 6(a), the network connection condition is better, the time delay is small, the signal strength is increased, the priority can be increased, and the IO port for sending the data block is increased; if the current distance between the access node A and the optional node C is far, the network condition is poor, the time delay is long, the priority level should be adjusted to be low, the number of IO ports for sending data blocks is reduced, the data delay is increased, and the frequency of sending data by an application layer is reduced; if the current distance between the access node A and the optional node D is between AB and AC, a value is correspondingly configured to be between AB and AC; if the distance between the access node a and the optional node B becomes longer and the AC distance becomes shorter as the position between the access node a and the optional node B changes as shown in fig. 6(B), the method adjusts in time according to the network condition, reduces the priority of transmission between the AB nodes, reduces the IO ports for sending data blocks, increases the priority of transmission between the AC nodes, and increases the IO ports for sending data blocks; if the access node a and the on-demand node B are farther and the changed on-demand node B should access the on-demand node C according to the current signal strength, as shown in fig. 6(C), the resource of the access node a is allocated to the on-demand node C and the on-demand node D. That is, the access node issues the data block to the corresponding on-demand node, and monitors the resource occupancy rate of the CPU of the access node in real time, and if the signal strength issued to a certain access node is poor and the time delay is high, which results in that the resource occupancy for receiving the thread is large, the packet sending frequency is reduced; and balancing the IO port of the data packet sent to the ECU by the node of the access node with the IO ports sent to other optional nodes, and accessing a new optional node when the access node is in an idle state.
Therefore, the invention can adjust the resources occupied by the tasks issued by the access node by monitoring the loss of each issuing process to the system and the data transmission quantity relation on IO, fully utilize all idle resources of the access node and ensure that the access node can stably run multiple tasks under the condition of limited system resources.
The technical scheme has the following advantages or beneficial effects: the invention provides an ad hoc network flash method of an automobile assembly production line, which can be used for quickly and accurately transmitting a flash data packet to a vehicle for vehicle upgrading flash, improving the flash rate, shortening the flash period, reducing the economic cost, being suitable for large-scale vehicle before delivery, and having wide application range.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (9)
1. An ad hoc network flashing method of an automobile assembly production line is applied to a plurality of vehicle nodes to be flashed and communication nodes, and is characterized in that effective flashing data packets are pre-configured in the communication nodes;
the ad hoc network flash method comprises the following steps:
step S1, the communication node constructs an access relation with at least one vehicle node in advance, and issues the flash data packet;
step S2, the vehicle nodes which receive the flash data packets are used as access nodes, and for each access node, an access relation is respectively established between the vehicle node and the vehicle node which can inquire the access node, and the flash data packets are issued;
and step S3, circularly executing the step S2 until all the vehicle nodes establish access relations and the flash data packet is received.
2. The ad-hoc network flashing method for the automobile assembly line as claimed in claim 1, wherein in the step S1, the communication node selects the vehicle node with the highest signal strength with the communication node from all the vehicle nodes and constructs the access relationship.
3. The ad hoc network flash method for an automobile assembly line according to claim 1, wherein the step S2 includes:
step S21, searching the vehicle node which does not receive the flash data packet and using the vehicle node as an on-demand node, searching the access node which has received the flash data packet in the communication range of the on-demand node, and establishing the access relation between the access node and the on-demand node;
step S22, the access node issues the flash data packet to the corresponding on-demand node;
and step S23, the on-demand node receives the flash data packet and updates the received on-demand node into the access node.
4. The ad-hoc network flash method of claim 3, wherein in step S21, when there are a plurality of access nodes in a communication range to which the on-demand node belongs, the access node with the highest signal strength and having the complete flash packet with the on-demand node is selected, and an access relationship is established.
5. The ad hoc network flash method of an automobile assembly production line according to claim 3, wherein in the step S22, before the access node issues the flash packet, the method further includes:
the access node divides the flash data packet sent to each on-demand node in advance according to the signal strength of all the accessed on-demand nodes, generates a plurality of data blocks of types corresponding to the signal strength, and sends the data blocks of the corresponding types to the corresponding on-demand nodes.
6. The ad hoc network flash method of claim 5, wherein the data blocks of different types have different sizes, and the sum of the data blocks of each type constitutes the data packet.
7. The ad hoc network flashing method of the automobile assembly production line as claimed in claim 5, wherein a key is set between the access node and each accessed on-demand node, and the access node encrypts the data block sent to the access node by using the key.
8. The ad hoc network flash method of an automobile assembly production line according to claim 5, wherein in step S22, in the process of issuing the flash data packet by the access node, the method further includes:
setting the access node to perform the flash upgrading according to the flash data packet, and sending the flash data packet to the priority of the on-demand node by the access node;
and the access node allocates the IO interface of the access node according to the corresponding priority.
9. The ad hoc network flash method of an automobile assembly production line according to claim 5, wherein in step S22, in the process of issuing the flash data packet by the access node, the method further includes:
and adjusting the priority of the access node for issuing the flash data packet to the on-demand node according to the signal strength between the on-demand node and the access node.
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Cited By (1)
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| CN115460038A (en) * | 2022-08-31 | 2022-12-09 | 广西玉柴机器股份有限公司 | Method, system, equipment and storage medium for improving controller writing efficiency |
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