CN208999822U - A kind of DCU circuitry self test system - Google Patents
A kind of DCU circuitry self test system Download PDFInfo
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- CN208999822U CN208999822U CN201820688271.4U CN201820688271U CN208999822U CN 208999822 U CN208999822 U CN 208999822U CN 201820688271 U CN201820688271 U CN 201820688271U CN 208999822 U CN208999822 U CN 208999822U
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Abstract
The utility model discloses a kind of DCU circuitry self test system, comprising: detection circuit, BDM tool and the off-line test instrument (EOL) being connect with the DCU, and pass through the host computer of off-line test instrument (EOL) and the DCU communication connection；The BDM tool is connect with the host computer；The beneficial effect of the utility model is: the monitoring system of the utility model can detect automatically circuit board input/output terminal before DCU circuit board fills shell, and whether there is or not Welding Problems, singlechip chip has fault-free, circuit board is solved because discovery DCU is carried out there are problem after detectable limit deviation caused by original part failure, and dress shell entrucking vehicle is done over again phenomenon.
Description
Technical field
The utility model is related to commercial vehicle DCU technical field of circuit board detection, in particular to the DCU circuit before a kind of dress shell is certainly
Check system.
Background technique
Since commercial vehicle electronic control technology is quickly grown, all kinds of automatically controlled DCU circuit boards enter the court fill shell before need to carry out circuit
Detection, especially input and output detect, and are worked normally with ensuring to install electronic control unit.
Now by taking SCR state V gas helps DCU circuit board as an example, since shell can be packed into after brushing BOOTLOADER, only fill
Upper vehicle brush could onboard judge circuit board input and output end with the presence or absence of problem after entering APP.And due to circuit board
Welding certainly exists disqualification rate, and underproof circuit board is very troublesome from newly restructuring after discovery, so needing a set of DCU
Equipment is restructured circuit board early period to be detected before DCU fills shell.
New content
In order to being detected before loading onto vehicle to DCU circuit board in DCU, avoid the occurrence of find after entrucking it is unqualified
Circuit board also needs situations such as restructuring again, and the utility model provides one kind progress circuit board self-test and each to circuit board before fill shell
The DCU circuitry self test system and detection method that input/output terminal is detected.
In order to realize that above-mentioned novel purpose, the utility model provide a kind of DCU circuitry self test system, the self-checking system packet
Include: detection circuit, BDM tool and the off-line test instrument (EOL) being connect with the DCU, and by off-line test instrument (EOL) with
The host computer of the DCU communication connection；The BDM tool is connect with the host computer；
The host computer: detection instruction is sent for communicating with off-line test instrument (EOL) to DCU, and in self-check program knot
Shu Hou receives off-line test instrument (EOL) and sends detection CAN message；
The BDM tool: for writing with a brush dipped in Chinese ink detection program to DCU；
The off-line test instrument (EOL): for sending detection instruction to DCU, and detection CAN message is sent to host computer；
The detection circuit: for connecting into circuit with DUC circuit board, and for responding detection program to DCU circuit board
Each switch carries out sequence detection.
Wherein, the detection circuit includes that at least four tunnels are corresponding with the output control terminal of DCU by NPN triode group
At switching circuit, the load resistance of the switching circuit with it is several routing divider resistances constitute bleeder circuits be connected；Institute
It states input port of the voltage output end of bleeder circuit with the DCU and connects and composes signal transmission loop.The detection circuit
It further include at least three tunnels voltage transmission circuit being made of current-limiting resistor corresponding with the output control terminal of DCU, it is described
Voltage transmission circuit is connected with the bleeder circuit that several routing divider resistances are constituted；The voltage output end of the bleeder circuit is equal
Signal transmission loop is connected and composed with the input port of the DCU.
The self-checking system further includes for the DCU connection detection circuit, BDM tool and off-line test instrument (EOL)
Integrated detection harness；The integrated detection harness includes that one end passes through plug connector female end and the DCU principal wire bundle connecting and three
Branch's harness that branch is connect with the principal wire bundle, three branch's harness pass through jtag interface female end and detection electricity respectively
Road connection is connect with BDM tool by interface and is connect by II female end of OBD with off-line test instrument (EOL).
In order to preferably realize above-mentioned novel purpose, present invention also provides a kind of detection method of DCU circuitry self test, institutes
State detection method specifically:
Step S1: host computer is connect by BDM tool, off-line test instrument (EOL) with DCU, circuit is will test and DCU connects
It connects；
Step S2: host computer carries out hardware initialization to DCU by BDM tool；
Step S3: host computer detects DCU by off-line test instrument (EOL), detecting step specifically:
Step S301: host computer issues interrupt signal, and is sent in safety certification by lower limit detector (EOL) to DCU
Break signal, the success if host computer and DCU shake hands, carries out step S302, if host computer shake hands with DCU it is unsuccessful, again into
The interaction of row handshaking information；
Step S302: whether lower limit detector (EOL) detection host computer, which issues, starts self-test order, if off-line test instrument
(EOL) self-test order is received, then carries out successively detecting DCU circuit board core function；
Step S303: if the testing result of any core function is exception, it is concurrent that off-line test instrument (EOL) merges message
To host computer, and return step S302；If all core function testing results are normally, to continue the ATD to DCU circuit board
Input terminal is successively detected；
Step S304: if the ATD input terminal of DCU circuit board all has problem, off-line test instrument (EOL) merges report
Text simultaneously issues host computer, and return step S302；If detect one and the above ATD input terminal result be it is normal, utilize head
A testing result is normal ATD input terminal, to detect all output ends, and by the testing result of ATD input terminal and output end
Synthesis message simultaneously issues host computer, and return step S202；
Step S305, off-line test instrument (EOL) detects the interruption self-test order that host computer is sent, then entire detection process
Terminate.
Wherein, the step S301 specifically: host computer sends first to DUC by off-line test instrument (EOL) and shakes hands
Information, DUC receives first handshaking information and is parsed to obtain parsing result by algorithm, and parsing result is sent back to
Position machine, whether host computer verifies parsing result correct, if correctly, sending shake hands successful information and subsequent match code again,
DCU is received shake hands successful information after, compare subsequent match code after carry out following detection step.
The handshaking information is 8 bytes, wherein preceding 2 bytes are mark of shaking hands, rear 6 bytes are accidental enciphering generation
Code；The parsing result is that DCU is decrypted to obtain by algorithm to accidental enciphering code.
Wherein, in the step S302, the detection of the core function includes detection, the main power supply of equipment of supply voltage
The detection of the detection of DCDC output voltage and CAN line in normal condition voltage.
Wherein, in the step S304, the detection to ATD input terminal and output end is by one and the DCU input terminal
The detection circuit that connects with output end is realized.
The detection circuit includes that at least four tunnels are corresponding with the output control terminal of DCU to be opened by what NPN triode formed
Powered-down road, the load resistance of the switching circuit are connected with the bleeder circuit that several routing divider resistances are constituted；The partial pressure
Input port of the voltage output end of circuit with the DCU connects and composes signal transmission loop.The detection circuit further includes
At least three tunnels voltage transmission circuit being made of current-limiting resistor corresponding with the output control terminal of DCU, the voltage pass
Transmission of electricity road is connected with the bleeder circuit that several routing divider resistances are constituted；The voltage output end of the bleeder circuit with it is described
The input port of DCU connects and composes signal transmission loop.
The DCU is connected by an integrated detection harness and the detection circuit, BDM tool and off-line test instrument (EOL)
It connects；The integrated detection harness includes that one end passes through plug connector female end and the DCU principal wire bundle connecting and three and the master
Branch's harness of harness connection, three branch's harness pass through JTAG interface female end respectively and connect with the detection circuit, is logical
Interface is crossed to connect with BDM tool and connect by II female end of OBD with off-line test instrument (EOL).Wherein, DCU has two speed
Two speed CAN lines are connect by CAN line with off-line test instrument (EOL), wherein with two in connection off-line test instrument branch harness
The connecting line of bar speed CAN line connection is respectively connected with the resistance of one 120 Ω, two 120 Ω resistor coupled in parallel, and connects two speed
The connecting line of CAN line distinguishes multiple twin, plays the role of reducing interference.
The beneficial effect of the utility model is: the monitoring system of the utility model can detect automatically circuit before DCU circuit board fills shell
Whether there is or not Welding Problems, singlechip chips fault-free for plate input/output terminal, solves circuit board because of detection caused by original part failure
The vehicle that carries out there are problem of discovery DCU is done over again phenomenon after limit deviation, and dress shell entrucking.
Detailed description of the invention
Fig. 1 is the structural block diagram of the utility model Examples 1 and 2.
Fig. 2 is the circuit diagram of detection circuit in the utility model Examples 1 and 2.
Fig. 3 is the structural schematic diagram that detection harness is integrated in the utility model Examples 1 and 2.
Fig. 4 is the flow diagram of the utility model embodiment 2.
Specific embodiment
In order to clarify the technical characteristics of the invention, being illustrated below by specific embodiment to this programme.
1 self-checking system of embodiment
The utility model embodiment provides a kind of DCU circuitry self test system, referring to Fig. 1, the self-checking system include: with it is described
Detection circuit, BDM tool and the off-line test instrument (EOL) of DCU connection, and it is logical by off-line test instrument (EOL) and the DCU
Interrogate the host computer of connection；The BDM tool is connect with the host computer；
The host computer: detection instruction is sent for communicating with off-line test instrument (EOL) to DCU, and in self-check program knot
Shu Hou receives off-line test instrument (EOL) and sends detection CAN message；
The BDM tool: for writing with a brush dipped in Chinese ink detection program to DCU；
The off-line test instrument (EOL): for sending detection instruction to DCU, and detection CAN message is sent to host computer；
The detection circuit: for connecting into circuit with DUC circuit board, and for responding detection program to DCU circuit board
Each switch carries out sequence detection.
Wherein, the detection circuit includes that at least four tunnels are corresponding with the output control terminal of DCU by NPN triode group
At switching circuit, the load resistance of the switching circuit with it is several routing divider resistances constitute bleeder circuits be connected；Institute
It states input port of the voltage output end of bleeder circuit with the DCU and connects and composes signal transmission loop.The detection circuit
It further include at least three tunnels voltage transmission circuit being made of current-limiting resistor corresponding with the output control terminal of DCU, it is described
Voltage transmission circuit is connected with the bleeder circuit that several routing divider resistances are constituted；The voltage output end of the bleeder circuit is equal
Signal transmission loop is connected and composed with the input port of the DCU.Referring to fig. 2, the state output terminal of DCU circuit is different, may
Be direct output be also likely to be the end DCU it is to switch metal-oxide-semiconductor or triode output, now directly export with 3 tunnels, the 4 road ends DCU are grasped
Make metal-oxide-semiconductor output, 7 road ATD input for, circuit diagram as shown in Fig. 2, wherein in switching circuit triode base resistance resistance value
Parallel resistance resistance value is 2k Ω between 6.8k Ω, base stage and emitter, the load resistance of collector is 1k Ω；Bleeder circuit
It is made of the resistance that two resistance values are 1k Ω.Due to DUC circuit input end ATD more have pull-up resistor, so do not need additionally be
Detection circuit increases power end；The precision of two divider resistances of the load resistance and bleeder circuit of collector is below 1%.
Referring to Fig. 3, the self-checking system further includes for the DCU connection detection circuit, BDM tool and off-line test instrument
(EOL) integrated detection harness；The integrated detection harness includes that one end passes through the main line that plug connector female end is connect with the DCU
Beam and three branch's harness being connect with the principal wire bundle, three branch's harness pass through respectively jtag interface female end with it is described
Detection circuit connection is connect with BDM tool by interface and is connect by II female end of OBD with off-line test instrument (EOL).
2 detection method of embodiment
Referring to fig. 4, the utility model embodiment provides a kind of detection method of DCU circuitry self test, and the detection method is specific
Are as follows:
Step S1: host computer is connect by BDM tool, off-line test instrument (EOL) with DCU, circuit is will test and DCU connects
It connects；
Step S2: host computer carries out hardware initialization to DCU by BDM tool；
Step S3: host computer detects DCU by off-line test instrument (EOL), detecting step specifically:
Step S301: host computer issues interrupt signal, and is sent in safety certification by lower limit detector (EOL) to DCU
Break signal, the success if host computer and DCU shake hands, carries out step S302, if host computer shake hands with DCU it is unsuccessful, again into
The interaction of row handshaking information；
Step S302: whether lower limit detector (EOL) detection host computer, which issues, starts self-test order, if off-line test instrument
(EOL) self-test order is received, then carries out successively detecting DCU circuit board core function；
Step S303: if the testing result of any core function is exception, it is concurrent that off-line test instrument (EOL) merges message
To host computer, and return step S302；If all core function testing results are normally, to continue the ATD to DCU circuit board
Input terminal is successively detected；
Step S304: if the ATD input terminal of DCU circuit board all has problem, off-line test instrument (EOL) merges report
Text simultaneously issues host computer, and return step S302；If detect one and the above ATD input terminal result be it is normal, utilize head
A testing result is normal ATD input terminal, to detect all output ends, and by the testing result of ATD input terminal and output end
Synthesis message simultaneously issues host computer, and return step S202；
Step S305, off-line test instrument (EOL) detects the interruption self-test order that host computer is sent, then entire detection process
Terminate.
Wherein, the step S301 specifically: host computer sends first to DUC by off-line test instrument (EOL) and shakes hands
Information, DUC receives first handshaking information and is parsed to obtain parsing result by algorithm, and parsing result is sent back to
Position machine, whether host computer verifies parsing result correct, if correctly, sending shake hands successful information and subsequent match code again,
DCU is received shake hands successful information after, compare subsequent match code after carry out following detection step.
The handshaking information is 8 bytes, wherein preceding 2 bytes are mark of shaking hands, rear 6 bytes are accidental enciphering generation
Code；The parsing result is that DCU is decrypted to obtain by algorithm to accidental enciphering code.
Wherein, in the step S302, the detection of the core function includes detection, the main power supply of equipment of supply voltage
The detection of the detection of DCDC output voltage and CAN line in normal condition voltage.In order to guarantee that circuit board in the detection process will not
Safety problem is generated, core function need to successively be detected according to security-critical grade, be asked as long as detecting that a core function exists
Topic, it is necessary to jump back out to and merge message and be sent to host computer；Because one of core function, there are problem, follow-up test must
It is so problematic or can possibly even cause subsequent hardware damage.Wherein, off-line test has been added with message is merged in safety certification
The communications protocol of instrument and host computer.
Wherein, in the step S304, the detection to ATD input terminal and output end is by one and the DCU input terminal
The detection circuit that connects with output end is realized.Detection circuit includes that at least four tunnels are corresponding with the output control terminal of DCU
The partial pressure that the switching circuit being made of NPN triode, the load resistance of the switching circuit and several routing divider resistances are constituted
Circuit is connected；Input port of the voltage output end of the bleeder circuit with the DCU connects and composes signal transmission loop.
The detection circuit further includes at least three tunnels voltage transmission being made of current-limiting resistor corresponding with the output control terminal of DCU
Circuit, the voltage transmission circuit are connected with the bleeder circuit that several routing divider resistances are constituted；The bleeder circuit
Input port of the voltage output end with the DCU connects and composes signal transmission loop.Referring to fig. 2, the output end shape of DCU circuit
State is different, it may be possible to which it is to switch metal-oxide-semiconductor or triode output that directly output, which is also likely to be the end DCU, is now directly exported with 3 tunnels, 4
The road end DCU operate metal-oxide-semiconductor output, 7 road ATD input for, circuit diagram as shown in Fig. 2, wherein in switching circuit triode base
Electrode resistance resistance value is 6.8k Ω, parallel resistance resistance value is 2k Ω between base stage and emitter, the load resistance of collector is 1k Ω；
Bleeder circuit is made of the resistance that two resistance values are 1k Ω.Since DUC circuit input end ATD has pull-up resistor more, so being not required to
Additionally to increase power end for detection circuit；The precision of two divider resistances of the load resistance and bleeder circuit of collector exists
Within 1%.
Referring to Fig. 3, the DCU passes through an integrated detection harness and the detection circuit, BDM tool and off-line test instrument
(EOL) it connects；The integrated detection harness includes that one end passes through plug connector female end and the DCU principal wire bundle connecting and three
The branch's harness connecting with the principal wire bundle, three branch's harness pass through jtag interface female end and the detection circuit respectively
Connection is connect with BDM tool by interface and is connect by II female end of OBD with off-line test instrument (EOL).Wherein, DCU has
Two speed CAN lines are connect by two speed CAN lines with off-line test instrument (EOL), wherein connection off-line test instrument branch harness
In the connecting line that is connect with two speed CAN lines be respectively connected with the resistance of one 120 Ω, two 120 Ω resistor coupled in parallel, and connect two
The connecting line of bar speed CAN line distinguishes multiple twin, plays the role of reducing interference.
Embodiment 3
To need to detect three core functions, 7 ATD input terminals for 7 output ends, merge message is described in detail
It sends.Three core functions, 7 ATD input terminals, 7 output ends need to issue an expansion frame.Wherein canbuf0 [0] is fixed
Justice is subsequent also how many byte CAN message, and canbuf0 [1] and canbuf0 [2] are the protocol with host computer,
Canbuf0 [3] to canbuf0 [7] is specific testing result (can be extended according to specific detection number).
Following is color legend
" message Byte number " is that slave computer tells that how many subsequent message of host computer is effective word joint number (containing this) above,
Online is 255, such as canbuf0 [0] is 0x1A, then the meaning is, plus this message, one shares 26 bytes, four messages
For this communication packet (8 bytes of a message).
Canbuf0 [1] and canbuf0 [2] is related protocol message, the specially function declaration of this message of slave computer,
It namely conveys the effect of this message to indicate DCU self-test situation, upper computer software is facilitated to parse.
Subsequent packet is all defaulted as FF, and each part detection accounts for the size of two Bit, and both certain A module was not when detecting
State is 0b11, this function, which defines each module, 4 kinds of states, and 0b11 is non-detecting state, and 0b00 is to detect problematic shape
State, 0b01 are detection normal condition, and 0b10 is reservation state.By taking the following figure as an example, if the value of canbuf0 [4] is
0b11000101 is detected normally then representing output end 3, and output end 4 detects normally, and output end 5 detects abnormal, output end 6
(being not in that output end has detection to have the message not detected in real process, this example is only for explanation) is not detected.
The foregoing is merely the preferred embodiments of the utility model, not to limit the utility model, all spirit in the utility model and
Within principle, any modification, equivalent replacement, improvement and so on be should be included within the protection scope of the utility model.
Claims (4)
1. a kind of DCU circuitry self test system, which is characterized in that the self-checking system includes: the detection electricity connecting with the DCU
Road, BDM tool and off-line test instrument (EOL), and pass through the host computer of off-line test instrument (EOL) and the DCU communication connection；
The BDM tool is connect with the host computer；
The host computer: sending detection instruction for communicating with off-line test instrument (EOL) to DCU, and after self-check program,
Receive off-line test instrument (EOL) and sends detection CAN message；
The BDM tool: for writing with a brush dipped in Chinese ink detection program to DCU；
The off-line test instrument (EOL): for sending detection instruction to DCU, and detection CAN message is sent to host computer；
The detection circuit: for connecting into circuit with DUC circuit board, and DCU circuit board is respectively opened for responding detection program
Put row sequence detection into.
2. DCU circuitry self test system according to claim 1, which is characterized in that the detection circuit includes at least four tunnels
The switching circuit being made of NPN triode corresponding with the output control terminal of DCU, if the load resistance of the switching circuit with
The bleeder circuit that main line is made of divider resistance is connected；Input of the voltage output end of the bleeder circuit with the DCU
Port connects and composes signal transmission loop.
3. DCU circuitry self test system according to claim 1, which is characterized in that the detection circuit further includes at least three
The road voltage transmission circuit being made of current-limiting resistor corresponding with the output control terminal of DCU, the voltage transmission circuit
The bleeder circuit constituted with several routing divider resistances is connected；The voltage output end of the bleeder circuit is with the DCU's
Input port connects and composes signal transmission loop.
4. DCU circuitry self test system according to claim 1 or 2, which is characterized in that further include for described in DCU connection
The integrated detection harness of detection circuit, BDM tool and off-line test instrument (EOL)；The integrated detection harness includes that one end passes through
Branch's harness that plug connector female end is connect with the DCU principal wire bundle connecting and three with the principal wire bundle, three branches
Harness passes through jtag interface female end respectively and connect with the detection circuit, connect and pass through OBD with BDM tool by interface
II female end is connect with off-line test instrument (EOL).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820688271.4U CN208999822U (en) | 2018-05-09 | 2018-05-09 | A kind of DCU circuitry self test system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201820688271.4U CN208999822U (en) | 2018-05-09 | 2018-05-09 | A kind of DCU circuitry self test system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896901A (en) * | 2018-05-09 | 2018-11-27 | 中国重汽集团济南动力有限公司 | A kind of DCU circuitry self test system and detection method |
| CN110493094A (en) * | 2019-08-26 | 2019-11-22 | 中国重汽集团济南动力有限公司 | A kind of All-in-One EOL diagnostic tool radio transfering device |
-
2018
- 2018-05-09 CN CN201820688271.4U patent/CN208999822U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896901A (en) * | 2018-05-09 | 2018-11-27 | 中国重汽集团济南动力有限公司 | A kind of DCU circuitry self test system and detection method |
| CN108896901B (en) * | 2018-05-09 | 2021-01-26 | 中国重汽集团济南动力有限公司 | DCU circuit self-checking system and detection method |
| CN110493094A (en) * | 2019-08-26 | 2019-11-22 | 中国重汽集团济南动力有限公司 | A kind of All-in-One EOL diagnostic tool radio transfering device |
| CN110493094B (en) * | 2019-08-26 | 2021-11-26 | 中国重汽集团济南动力有限公司 | All-in-one EOL diagnostic tool wireless switching device |
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