CN111884865A - Vehicle bus problem point detection equipment and detection method thereof - Google Patents
Vehicle bus problem point detection equipment and detection method thereof Download PDFInfo
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- CN111884865A CN111884865A CN202010773003.4A CN202010773003A CN111884865A CN 111884865 A CN111884865 A CN 111884865A CN 202010773003 A CN202010773003 A CN 202010773003A CN 111884865 A CN111884865 A CN 111884865A
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- 238000001514 detection method Methods 0.000 title claims abstract description 49
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 239000002184 metal Substances 0.000 claims description 6
- 101150008604 CAN1 gene Proteins 0.000 description 5
- 101150063504 CAN2 gene Proteins 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 230000001105 regulatory effect Effects 0.000 description 4
- 238000011835 investigation Methods 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005856 abnormality Effects 0.000 description 1
- MLYYVTUWGNIJIB-BXKDBHETSA-N cefazolin Chemical compound S1C(C)=NN=C1SCC1=C(C(O)=O)N2C(=O)[C@@H](NC(=O)CN3N=NN=C3)[C@H]2SC1 MLYYVTUWGNIJIB-BXKDBHETSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40169—Flexible bus arrangements
- H04L12/40176—Flexible bus arrangements involving redundancy
- H04L12/40182—Flexible bus arrangements involving redundancy by using a plurality of communication lines
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0677—Localisation of faults
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K9/00—Screening of apparatus or components against electric or magnetic fields
- H05K9/0007—Casings
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40208—Bus networks characterized by the use of a particular bus standard
- H04L2012/40215—Controller Area Network CAN
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/40267—Bus for use in transportation systems
- H04L2012/40273—Bus for use in transportation systems the transportation system being a vehicle
Abstract
The invention discloses a vehicle bus problem point detection device and a detection method thereof, wherein the device comprises a microprocessor and two mutually independent CAN channels connected with the microprocessor, wherein the two CAN channels are accessed to the relative middle position of a CAN network backbone network to divide a bus into 2 independent CAN network loops; each CAN channel comprises a CAN transceiver and a terminal resistor configuration circuit, and the terminal resistor configuration circuit is provided with a plurality of resistors with different grades for configuration. The device divides the bus into 2 independent CAN network loops by accessing the relative middle position of the CAN network backbone network, so that a user CAN conveniently divide the network, and the position of a fault problem point is gradually positioned by dividing the network layer by layer. The invention can efficiently locate the problem and does not influence the original functions of the vehicle.
Description
Technical Field
The invention relates to the field of vehicle control equipment, in particular to vehicle bus problem point detection equipment and a detection method thereof.
Background
The CAN bus belongs to a shared network, any ECU in the network is abnormal, the communication of the whole CAN network CAN be influenced, the existing equipment CAN only monitor the abnormal state of the network, but the abnormal position of a network problem point cannot be accurately positioned. How to efficiently locate the problem point without influencing the original functions of the vehicle becomes a main problem to be solved by the current research.
Disclosure of Invention
The invention aims to provide vehicle bus problem point detection equipment and a detection method thereof.
The technical scheme adopted by the invention is as follows:
a vehicle bus problem point detection device comprises a microprocessor and two mutually independent CAN channels connected with the microprocessor, wherein the two CAN channels are connected to the relative middle position of a CAN network backbone network to divide a bus into 2 independent CAN network loops; each CAN channel comprises a CAN transceiver and a terminal resistor configuration circuit, and the terminal resistor configuration circuit is provided with a plurality of resistors with different grades for configuration.
Further, the different resistances of the termination resistance configuration circuit are respectively 120 Ω, 60 Ω and 4.4k Ω.
Furthermore, the working mode of the detection equipment has the characteristics of full message routing and fault isolation; the error frames of two CAN channels of the detection equipment are mutually isolated and are not routed; after the detection equipment is powered on, routing all messages received by one CAN channel to the other CAN channel within 5 ms; meanwhile, the other path of CAN channel routes all the received messages to one path of CAN channel within 5 ms.
Furthermore, the terminal resistor configuration circuit is configured to be a resistor of any gear through an external adjusting switch.
Further, the terminal resistor configuration circuit configures the resistors of the corresponding levels according to different initial terminal resistors corresponding to the independent CAN network loop.
Furthermore, the detection equipment also comprises a power chip which respectively supplies power to the microprocessor and the two paths of CAN transceivers.
Further, the detection equipment is provided with a metal shielding shell, and external EMC interference is effectively blocked.
The invention also discloses a detection method of the vehicle bus problem point detection equipment, which adopts the vehicle bus problem point detection equipment and comprises the following steps:
step 3, adjusting the vehicle to a fault working condition, and transmitting and receiving normal message signals;
step 4, capturing the message waveforms of 2 independent CAN network loops by using an oscilloscope, and determining the CAN network loops with interference;
step 5, judging whether the CAN network loop with the interference CAN be continuously divided; if yes, continuously dividing the CAN network loop with interference by using detection equipment and executing the step 2; otherwise, positioning and finding out the abnormal ECU and finishing the detection.
Further, in step 2, the terminal resistance configuration circuit is configured correspondingly according to the terminal resistances of 2 independent CAN network loops.
Further, the fault conditions include various fault conditions such as starting of an engine and turning on of an air conditioner.
By adopting the technical scheme, the invention has 2 paths of CAN channels, and the 2 paths of CAN channels are mutually independent and do not interfere with each other. Every way CAN passageway all is equipped with the terminating resistance configuration circuit, through external regulating switch, CAN set for CAN terminating resistance respectively: 120 Ω, 60 Ω, 4.4k Ω; aiming at independently matching the CAN terminal resistors of respective loops in the follow-up problem point investigation process). The equipment adopts the metal shielding shell, and can effectively block external EMC interference. The device divides the bus into 2 independent CAN network loops by accessing the relative middle position of the CAN network backbone network, so that a user CAN conveniently divide the network, and the position of a fault problem point is gradually positioned by dividing the network layer by layer. The invention can efficiently locate the problem and does not influence the original functions of the vehicle.
Drawings
The invention is described in further detail below with reference to the accompanying drawings and the detailed description;
FIG. 1 is a schematic structural diagram of a vehicle bus trouble spot detection apparatus according to the present invention;
FIG. 2 is a schematic diagram of a typical topology of a one-way CAN network;
FIG. 3 is a schematic diagram illustrating a usage status of a vehicle bus trouble spot detection apparatus accessing a CAN network according to the present invention;
fig. 4 is a second schematic diagram illustrating a use state of the vehicle bus trouble detection device accessing the CAN network according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
As shown in one of fig. 1 to 4, the present invention discloses a vehicle bus trouble spot detection apparatus, which includes a microprocessor and two mutually independent CAN channels connected with the microprocessor, wherein the two CAN channels are connected to the relative middle position of a CAN network backbone network to divide a bus into 2 independent CAN network loops; each CAN channel comprises a CAN transceiver and a terminal resistor configuration circuit, and the terminal resistor configuration circuit is provided with a plurality of resistors with different grades for configuration.
Further, the different resistances of the termination resistance configuration circuit are respectively 120 Ω, 60 Ω and 4.4k Ω.
Furthermore, the working mode of the detection equipment has the characteristics of full message routing and fault isolation; the error frames of two CAN channels of the detection equipment are mutually isolated and are not routed; after the detection equipment is powered on, routing all messages received by one CAN channel to the other CAN channel within 5 ms; meanwhile, the other path of CAN channel routes all the received messages to one path of CAN channel within 5 ms.
Furthermore, the terminal resistor configuration circuit is configured to be a resistor of any gear through an external adjusting switch.
Further, the terminal resistor configuration circuit configures the resistors of the corresponding levels according to different initial terminal resistors corresponding to the independent CAN network loop.
Furthermore, the detection equipment also comprises a power chip which respectively supplies power to the microprocessor and the two paths of CAN transceivers.
Further, the detection equipment is provided with a metal shielding shell, and external EMC interference is effectively blocked.
The invention also discloses a detection method of the vehicle bus problem point detection equipment, which adopts the vehicle bus problem point detection equipment and comprises the following steps:
step 3, adjusting the vehicle to a fault working condition, and transmitting and receiving normal message signals;
step 4, capturing the message waveforms of 2 independent CAN network loops by using an oscilloscope, and determining the CAN network loops with interference;
step 5, judging whether the CAN network loop with the interference CAN be continuously divided; if yes, continuously dividing the CAN network loop with interference by using detection equipment and executing the step 2; otherwise, positioning and finding out the abnormal ECU and finishing the detection.
Further, in step 2, the terminal resistance configuration circuit is configured correspondingly according to the terminal resistances of 2 independent CAN network loops.
Further, the fault conditions include various fault conditions such as starting of an engine and turning on of an air conditioner.
The following is a detailed description of the specific working principle of the present invention:
specifically, the device provided by the invention is provided with 2 paths of CAN channels, and the 2 paths of CAN channels are mutually independent and do not interfere with each other. Every way CAN passageway all is equipped with the terminating resistance configuration circuit, through external regulating switch, CAN set for CAN terminating resistance respectively: 120 Ω, 60 Ω, 4.4k Ω; aiming at independently matching the CAN terminal resistors of respective loops in the follow-up problem point investigation process). The equipment adopts the metal shielding shell, and can effectively block external EMC interference. The equipment of the invention has the following characteristics: routing of full messages: after the equipment is powered on, all messages received by the CAN1 channel CAN be routed to the CAN2 within 5ms, and simultaneously all messages received by the CAN2 channel CAN be routed to the CAN1 within 5 ms; fault isolation: the error frames of CAN1 and CAN2 channels are isolated from each other and not routed.
As shown in FIG. 2, a typical topology of a one-way CAN network, ECUs A/B serve as CAN network termination nodes (each equipped with 120 Ω termination resistors). When the bus is abnormally interfered (identified by an oscilloscope), because the bus is a shared network, an interference source can be a certain ECU, and also can be EMC interference from a certain section of wire harness. At this moment, if there is interference after the vehicle switch is powered on, the problem point can be located by pulling out the ECU one by one, but if the vehicle is in some working modes (such as after the air conditioner is turned on), the interference occurs, and at this moment, pulling out the ECU may cause the problem that the related functions are closed and the positioning cannot be performed. In this case, the apparatus of the present invention can be used to locate the problem, and the specific steps of the detection by the apparatus of the present invention are as follows:
when a fault occurs, equipment is accessed to the position of a CAN network backbone network relative to the middle; as shown in fig. 3, X represents a device, dividing the bus into 2 independent CAN networks; as shown in fig. 3, ACEFX constitutes a CAN1 network, BGDX constitutes a CAN2 network);
the terminal resistance of a CAN 1/2 channel equipped with the equipment X1 is 120 omega, and 2 CAN networks have one terminal resistance respectively;
regulating the vehicle to a fault condition, such as starting an engine, and turning on an air conditioner; at this time, all the sent and received message signals are normal for the ABCDEFG ECU, so the function is not influenced;
fourthly, grabbing the waveform of the CAN 1/2 message by using an oscilloscope to determine which loop still has interference; assuming that CAN1 of ACEF still has interference, CAN2 has no abnormality;
at this time, the device X2 may be adapted to continue to divide the network, as another embodiment, X1 may be removed to restore the network, and then placed at the X2 device position, and the vehicle is adjusted to a fault condition, and if the positioning is that the AE network is in problem or the CF network is in problem, until the abnormal ECU is found out.
By adopting the technical scheme, the invention has 2 paths of CAN channels, and the 2 paths of CAN channels are mutually independent and do not interfere with each other. Every way CAN passageway all is equipped with the terminating resistance configuration circuit, through external regulating switch, CAN set for CAN terminating resistance respectively: 120 Ω, 60 Ω, 4.4k Ω; aiming at independently matching the CAN terminal resistors of respective loops in the follow-up problem point investigation process). The equipment adopts the metal shielding shell, and can effectively block external EMC interference. The device divides the bus into 2 independent CAN network loops by accessing the relative middle position of the CAN network backbone network, so that a user CAN conveniently divide the network, and the position of a fault problem point is gradually positioned by dividing the network layer by layer. The invention can efficiently locate the problem and does not influence the original functions of the vehicle.
It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the detailed description of the embodiments of the present application is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Claims (10)
1. The utility model provides a vehicle bus problem point check out test set which characterized in that: the CAN bus comprises a microprocessor and two mutually independent CAN channels connected with the microprocessor, wherein the two CAN channels are accessed to the relative middle position of a CAN network backbone network to divide a bus into 2 independent CAN network loops; each CAN channel comprises a CAN transceiver and a terminal resistor configuration circuit, and the terminal resistor configuration circuit is provided with a plurality of resistors with different grades for configuration.
2. The vehicle bus problem point detecting apparatus according to claim 1, characterized in that: the different grades of resistance of the terminal resistance configuration circuit are respectively 120 omega, 60 omega and 4.4k omega.
3. The vehicle bus problem point detecting apparatus according to claim 1, characterized in that: the error frames of two CAN channels of the detection equipment are mutually isolated and are not routed; after the detection equipment is powered on, routing all messages received by one CAN channel to the other CAN channel within 5 ms; meanwhile, the other path of CAN channel routes all the received messages to one path of CAN channel within 5 ms.
4. The vehicle bus problem point detecting apparatus according to claim 1, characterized in that: the terminal resistor configuration circuit is configured into a resistor of any gear through an external adjusting switch.
5. The vehicle bus problem point detecting apparatus according to claim 1, characterized in that: and the terminal resistance configuration circuit configures the resistance of the corresponding gear according to the initial terminal resistance of the corresponding independent CAN network loop.
6. The vehicle bus problem point detecting apparatus according to claim 1, characterized in that: the detection equipment further comprises a power chip which respectively supplies power to the microprocessor and the two paths of CAN transceivers.
7. The vehicle bus problem point detecting apparatus according to claim 1, characterized in that: the detection equipment is provided with a metal shielding shell, and external EMC interference is effectively blocked.
8. A detection method of a vehicle bus problem point detection apparatus, which employs a vehicle bus problem point detection apparatus according to any one of claims 1 to 7, characterized in that: the detection method comprises the following steps:
step 1, accessing a detection device to a relative middle position of a CAN network backbone network to be detected, and dividing a bus into 2 independent CAN network loops;
step 2, configuring a terminal resistance configuration circuit of each CAN channel into a resistance of a corresponding gear according to a CAN network backbone network;
step 3, adjusting the vehicle to a fault working condition, and transmitting and receiving normal message signals;
step 4, capturing the message waveforms of 2 independent CAN network loops by using an oscilloscope, and determining the CAN network loops with interference;
step 5, judging whether the CAN network loop with the interference CAN be continuously divided; if yes, continuously dividing the CAN network loop with interference by using detection equipment and executing the step 2; otherwise, positioning and finding out the abnormal ECU and finishing the detection.
9. The vehicle bus problem point detecting apparatus according to claim 8, wherein: and in the step 2, the terminal resistor configuration circuit is correspondingly configured according to the terminal resistors of the 2 independent CAN network loops.
10. The vehicle bus problem point detecting apparatus according to claim 8, wherein: the fault conditions include engine start and turning on of the air conditioner.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010773003.4A CN111884865B (en) | 2020-08-04 | 2020-08-04 | Vehicle bus problem point detection equipment and detection method thereof |
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| CN202010773003.4A CN111884865B (en) | 2020-08-04 | 2020-08-04 | Vehicle bus problem point detection equipment and detection method thereof |
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| CN111884865B CN111884865B (en) | 2023-11-14 |
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Cited By (2)
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| CN114884767A (en) * | 2022-05-07 | 2022-08-09 | 广州软件学院 | Synchronous dual-redundancy CAN bus communication system, method, equipment and medium |
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| CN111884865B (en) | 2023-11-14 |
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Address after: No. 66 Southeast Avenue, Qingkou Town, Minhou County, Fuzhou City, Fujian Province, 350119 Patentee after: Southeast (Fujian) Automobile Industry Co.,Ltd. Country or region after: China Address before: 350000 Qingkou Town, Minhou County, Fuzhou City, Fujian Province Patentee before: SOUTH EAST (FUJIAN) MOTOR Corp.,Ltd. Country or region before: China |