CN208255712U - Hand-held type automobile diagnostic equipment based on CAN-BUS bus communication protocol - Google Patents
Hand-held type automobile diagnostic equipment based on CAN-BUS bus communication protocol Download PDFInfo
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- CN208255712U CN208255712U CN201820838086.9U CN201820838086U CN208255712U CN 208255712 U CN208255712 U CN 208255712U CN 201820838086 U CN201820838086 U CN 201820838086U CN 208255712 U CN208255712 U CN 208255712U
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Abstract
The utility model discloses a kind of hand-held type automobile diagnostic equipment based on CAN-BUS bus communication protocol, the hand-held type automobile diagnostic equipment includes shell, multiple keys that the intracorporal diagnostic circuit of shell is arranged in and is arranged on shell, diagnostic circuit include MCU controller, CAN-BUS conversion circuit, key circuit, LCD display and power circuit；Multiple keys and key circuit are electrically connected, power circuit, key circuit and LCD display are electrically connected with MCU controller, MCU controller also passes through CAN-BUS conversion circuit and the diagnosis interface of electric car is electrically connected, and the electrical control circuit for diagnosing interface and automobile is electrically connected.Hand-held type automobile diagnostic equipment of the utility model based on CAN-BUS bus communication protocol be light and handy, convenient and have the advantages of simple structure and easy realization.
Description
Technical field
The utility model relates to automotive diagnostic system technical fields, in particular to a kind of to be assisted based on CAN-BUS bus communication
The hand-held type automobile diagnostic equipment of view.
Background technique
Auto analyzer, also referred to as vehicle diagnosis computer, he is using modern detecting, electronic technology, computer
Application technology implements non-disassembly measurement, diagnosis to automobile, it can detecte, be diagnosed to be the various performance parameters of automobile, be complete
Face, the technology status of accurate evaluation automobile, service performance provide reliable basis；It can be quick by the error code of automobile ECU
The situation for being likely to occur failure is found, provides information for troubleshooting.It is developed both at home and abroad for automobile electric control system event
Hinder diagnosis application system, still, have the shortcomings that it is expensive or heavy, therefore, develop it is multiple functional, it is light, fit
With and moderate diagnostic device it is necessary.
Utility model content
The main purpose of the utility model is to provide a kind of hand-held type automobile diagnosis based on CAN-BUS bus communication protocol
A kind of instrument, it is desirable to provide light, convenient and simple structure Auto analyzer.
To achieve the above object, the utility model proposes a kind of hand-held vapour based on CAN-BUS bus communication protocol
Vehicle diagnostic equipment includes shell, and the multiple keys of the intracorporal diagnostic circuit of the shell and setting on the housing are arranged in, described
Diagnostic circuit includes MCU controller, CAN-BUS conversion circuit, LCD display screen, key circuit and power circuit；It is the multiple
Key and the key circuit are electrically connected, the power circuit, the key circuit and the LCD display with it is described
MCU controller is electrically connected, and diagnosis interface of the MCU controller also via the CAN-BUS conversion circuit and automobile is electrical
The electrical control circuit of connection, the diagnosis interface and automobile is electrically connected；Wherein,
The CAN-BUS conversion circuit, data flow and the output of MCU controller for being exported to the electrical control circuit
Failure elimination instruction carry out level conversion so that the communication between the MCU controller and the electrical control circuit is followed and is based on
CAN-BUS bus communication protocol；
The key circuit, for exporting different trigger signals to the MCU controller, in the LCD display
Error code in the data flow for carrying out the electrical control circuit output is inquired, and the control MCU controller output event
Barrier eliminates instruction to the electrical control circuit, to carry out the elimination of failure；
The MCU controller is logical for carrying out signal by the CAN-BUS conversion circuit and the automobile electrically-controlled circuit
News to obtain the data flow of electrical control circuit output, and obtain error code from the data flow, and by the data flow and
The error code is exported to the LCD display, so that the LCD display carries out the data flow and the error code
Display.
Preferably, the signal end of the CAN-BUS conversion circuit includes the first signal end, second signal end, third signal
End, fourth signal end and the 5th signal end, the CAN-BUS conversion circuit include CAN-BUS conversion chip, first resistor, the
Two resistance, first capacitor, the second capacitor and the first operating voltage input terminal；The first end of the first resistor, first electricity
The connecting node of first signal end of the first end of appearance and the CAN-BUS conversion chip is the CAN-BUS conversion circuit
First signal end, the second end of the first capacitor, the second end of second capacitor and the CAN-BUS conversion chip
Ground terminal is grounded, the second end of the first resistor, the second end of second capacitor and the CAN-BUS conversion chip
The connecting node at second signal end be the CAN-BUS conversion circuit second signal end, the first end of the second resistance and
The power end of the CAN-BUS conversion chip is connect with the first operating voltage input terminal, and the second of the second resistance
It holds, the third signal that the connecting node of the third signal end of the CAN-BUS conversion chip is the CAN-BUS conversion circuit
End, the fourth signal end of the CAN-BUS conversion chip are the fourth signal end of CAN-BUS conversion circuit, and the CAN-BUS turns
The 5th signal end for changing chip is the 5th signal end of CAN-BUS conversion circuit.
Preferably, the CAN-BUS conversion chip model TJA1050.
Preferably, the power circuit include 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, third capacitor,
4th capacitor, the 5th capacitor, the 6th capacitor, the 7th capacitor, power conversion chip, first diode, inductance and the second work electricity
Press input terminal；
The first end of the 3rd resistor, the first end of the 4th resistance, the first end of the third capacitor, described
The power end of the first end of four capacitors and the power conversion chip is connect with the second operating voltage input terminal, and described
The second end of three capacitors and the second end of the 4th capacitor are grounded, the second end of the 3rd resistor, the 4th resistance
Second end and the power conversion chip peak point current input terminal with the switch receiving end of the power conversion chip connect
It connects, the switch transmitting terminal of the power conversion chip and the cathode of the first diode connect with the first end of the inductance
It connects, the second end of the inductance, the first end of the 6th resistance, the first end of the 6th capacitor and the 7th capacitor
The connecting node of first end is the power output end of the power circuit, the second end of the 6th resistance and the 5th resistance
First end be grounded, the second end of the 5th resistance is connect with the common end of the power conversion chip, the power supply turn
The timing capacitor end for changing chip is connect with the first end of the 5th capacitor, the ground terminal of the power conversion chip, described
The second end of five capacitors, the anode of the first diode, the second end of the 6th capacitor and the 7th capacitor second
End is grounded.
Preferably, the hand-held type automobile diagnostic equipment based on CAN-BUS bus communication protocol further includes for storing
The FLASH memory of data flow is stated, the FLASH memory and the MCU controller are electrically connected.
The hand-held type automobile diagnostic equipment for being preferably based on CAN-BUS bus communication protocol further includes USB interface, described
MCU controller is electrically connected by the USB interface and host computer.
Technical solutions of the utility model are by using designing a kind of hand-held type automobile based on CAN-BUS bus communication protocol
Diagnostic equipment, being somebody's turn to do the hand-held type automobile diagnostic equipment based on CAN-BUS bus communication protocol includes shell, is arranged in the intracorporal diagnosis of shell
Circuit and the multiple keys being arranged on shell, diagnostic circuit include that MCU controller, CAN-BUS conversion circuit, LCD are shown
Screen, key circuit and power circuit；When work, MCU controller passes through the diagnosis of CAN-BUS conversion circuit and automobile electrically-controlled circuit
Interface carry out the communication of CANH and CANL differential data stream, and the communication between MCU controller and electrical control circuit, which follows, to be based on
CAN-BUS bus communication protocol, CAN-BUS conversion circuit flows into line level conversion to data, while being carried out by LCD display
The related display of data flow and error code, and selection can be carried out by key circuit and checked, and export fault clearance instruct to
Electrical control circuit is to carry out the removing of failure.Hand-held type automobile diagnostic equipment of the utility model based on CAN-BUS bus communication protocol
It has the advantages of simple structure and easy realization, and is convenient for carrying.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the function of hand-held type automobile diagnostic equipment one embodiment of the utility model based on CAN-BUS bus communication protocol
It can module diagram；
Fig. 2 is the utility model based in one embodiment of hand-held type automobile diagnostic equipment of CAN-BUS bus communication protocol
The electrical block diagram of CAN-BUS conversion sub-circuit；
Fig. 3 is the utility model based on electric in one embodiment of hand-held type automobile diagnostic equipment of CAN-BUS bus communication protocol
The electrical block diagram of source circuit；
Fig. 4 is hand-held type automobile diagnostic equipment another embodiment of the utility model based on CAN-BUS bus communication protocol
The functional block diagram.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and cannot
It is interpreted as its relative importance of indication or suggestion or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In addition, the skill between each embodiment
Art scheme can be combined with each other, but must be based on can be realized by those of ordinary skill in the art, when technical solution
It will be understood that the combination of this technical solution is not present in conjunction with there is conflicting or cannot achieve when, also not in the utility model
It is required that protection scope within.
The utility model proposes a kind of hand-held type automobile diagnostic equipments based on CAN-BUS bus communication protocol.
Hand-held type automobile diagnostic equipment one as shown in FIG. 1, FIG. 1 is the utility model based on CAN-BUS bus communication protocol
The functional block diagram of embodiment, in the present embodiment, the hand-held type automobile diagnostic equipment packet based on CAN-BUS bus communication protocol
Shell (not shown go out) is included, the multiple keys of the intracorporal diagnostic circuit 100 of the shell and setting on the housing are set
(not shown go out), the diagnostic circuit 100 include MCU controller 110, CAN-BUS conversion circuit 120, key circuit 140,
LCD display 150 and power circuit 130；The multiple key and the key circuit 140 are electrically connected, the power circuit
130, the key circuit 140 and the LCD display 150 are electrically connected with the MCU controller 110, the MCU control
Device 110 is also electrically connected via the diagnosis interface 220 of the CAN-BUS conversion circuit 120 and automobile, the diagnosis interface 220
It is electrically connected with the electrical control circuit 210 of automobile；Wherein,
The CAN-BUS conversion circuit 120, data flow and MCU controller for being exported to the electrical control circuit 210
The Failure elimination instruction of 110 outputs carries out level conversion, so that between the MCU controller 110 and the electrical control circuit 210
Communication is followed based on CAN-BUS bus communication protocol；
The key circuit 140, for exporting different trigger signals to the MCU controller 110, with aobvious in the LCD
The error code carried out in the data flow that the electrical control circuit 210 exports is inquired in display screen 150, and the control MCU
Controller 110 exports Failure elimination and instructs to the electrical control circuit 210, to carry out the elimination of failure；
The MCU controller 110, for being carried out by the CAN-BUS conversion circuit 120 with the electrical control circuit 210
Signal communication to obtain the data flow that the electrical control circuit 210 exports, and obtains error code from the data flow, and by institute
State data flow and the error code exported to the LCD display 150, for the LCD display 150 to the data flow and
The error code is shown.
It should be noted that electrical control circuit 210 refers to electronic control unit, abbreviation ECU, the function of electrical control circuit 210
It is that the information inputted according to the program and data of its memory to air flow meter and various sensors carries out operation, processing, judgement,
Then output order, electrical control circuit 210 are made of microcomputer, input, output and control circuit etc..In electrical control circuit 210
Portion's fault detection circuit can constantly monitor each element manipulation of electric-control system in car running process, when discovery electronic component has
Program can be run by startup separator automatically when failure, failure is stored in the form of code in the RAM of computer, while passing through instrument
Malfunction indicator lamp issues failure warning signal, and Auto analyzer is uniquely can directly to carry out exchange of information with electrical control circuit 210
Equipment, Auto analyzer carried out mutually under the support of certain agreement with electrical control circuit 210 by the diagnosis interface 220 with automobile
The various information of Communication, to obtain the important parameter of the work of electrical control circuit 210.
Auto analyzer major function includes read failure code, removes error code, reading data flow and other auxiliary function
Can, in the present embodiment, the MCU controller 110 in Auto analyzer passes through CAN-BUS conversion circuit 120 and electrical control circuit 210
It is communicated, to obtain the error code in the data flow and data flow in electrical control circuit 210, and passes through key circuit 140
The inquiry and elimination of error code are carried out in LCD display 150.
Diagnosis interface 220 is OBD interface, and OBD full name is (On Board DiagnosTIcs, mounted automatic diagnosis system
System), OBD interface includes 16 pins, and in the present embodiment, the both ends CANH and CANL of CAN-BUS conversion circuit 120 are then distinguished
It is connect with pin 6 and pin 14.
It should be noted that key physical button made of silica gel, or pressed by the touch-control that software interface emulates
Key, here, with no restrictions.
When MCU controller 110 is connect with electrical control circuit 210 by CAN-BUS conversion circuit 120, MCU controller 110
The KWP2000 communication protocol based on CAN-BUS bus is followed between electrical control circuit 210, based on CAN-BUS bus
That KWP2000 agreement actually refers to is exactly ISO/WD15765-1~15765-4, diagnosis of the agreement KWP2000 application layer
On Service Portability to CAN bus.Data link layer uses ISO11898-1 agreement, the agreement be to CAN2.0B agreement into
The standardization of one step and standardization；Application layer uses ISO15765-3 agreement, the completely compatible application layer association based on K line of the agreement
14230-3 is discussed, and joined CAN bus diagnostic function group；Network layer then uses ISO15765-2 agreement, it is specified that network layer association
The mapping relations between data cell (N_PDU) and bottom CAN data frame and upper layer KWP2000 service are discussed, and are long report
More bag data transmission processes of text provide synchronously control, sequential control, flow control and Fault recovery function, CAN-BUS conversion
The data flow that circuit 120 is used to export electrical control circuit 210 carries out signal amplification or instructs Failure elimination to carry out the range of decrease, from
And meet the requirement of the communication protocol based on CAN-BUS bus.
Two signal wires of CAN-BUS are CANH and CANL respectively, if it is Dominant (aobvious that CANH level, which is greater than CANL,
Property level), expression is signal 0；If it is Recessive (stealthy level) that CANH level, which is equal to CANL, expression is signal
1, CANH data line and CANL data line and diagnosis interface 220 are electrically connected, and carry out data flow and Failure elimination instruction
Transmission, data flow are exported by carrying out level conversion in CAN-BUS conversion circuit 120 to MCU controller 110, to complete
The communication of MCU controller 110 and electrical control circuit 210 follows the KWP2000 agreement based on CAN-BUS bus, base between the two
It does not need to initialize ECU in the diagnostic device of CAN bus and can carry out diagnostic service, convenient and reliable, MCU controller
110 receive the reduction of progress signal after the data flow after conversion, and data flow and failure are carried out in LCD display 150
The display of code, the inquiry and elimination of error code can be carried out by key circuit 140.
The present embodiment technical solution is examined by using designing a kind of hand-held type automobile based on CAN-BUS bus communication protocol
Disconnected instrument, being somebody's turn to do the hand-held type automobile diagnostic equipment based on CAN-BUS bus communication protocol includes shell, and setting is in the intracorporal diagnosis electricity of shell
Road 100 and the multiple keys being arranged on shell, diagnostic circuit 100 include MCU controller 110, CAN-BUS conversion circuit
120, LCD display 150 and power circuit 130；When work, MCU controller 110 passes through CAN-BUS conversion circuit 120 and automobile
The diagnosis interface 220 of electrical control circuit 210 carry out carry out CANH and CANL differential signal communication, MCU controller 110 with it is automatically controlled
Communication between circuit 210 is followed based on CAN-BUS bus communication protocol, and CAN-BUS conversion circuit 120 carries out data stream
Level conversion, while being shown by the correlation that LCD display 150 carries out data flow and error code, and key circuit can be passed through
140, which carry out selection, checks, and exports fault clearance and instruct to electrical control circuit 210 removing for carrying out failure.The utility model base
It has the advantages of simple structure and easy realization, and is convenient for carrying in the hand-held type automobile diagnostic equipment of CAN-BUS bus communication protocol.
As shown in Fig. 2, Fig. 2 is hand-held type automobile diagnostic equipment one of the utility model based on CAN-BUS bus communication protocol
The electrical block diagram of CAN-BUS conversion sub-circuit in embodiment, it is together referring to Fig.1 and Fig. 2, in one embodiment, described
The signal end of CAN-BUS conversion circuit 120 includes the first signal end, second signal end, third signal end, fourth signal end and the
Five signal ends, the CAN-BUS conversion circuit 120 include CAN-BUS conversion chip U1, first resistor R1, second resistance R2,
First capacitor C1, the second capacitor C2 and the first operating voltage VCC input terminal.
Specifically, the first end of the first resistor R1, the first end of the first capacitor C1 and the CAN-BUS turn
Change the first signal end of chip U1 connecting node be the CAN-BUS conversion circuit 120 the first signal end, described first
The ground terminal of the second end of capacitor C1, the second end of the second capacitor C2 and the CAN-BUS conversion chip U1 is grounded, institute
State the second signal of the second end of first resistor R1, the second end of the second capacitor C2 and the CAN-BUS conversion chip U1
The connecting node at end is the second signal end of the CAN-BUS conversion circuit 120, the first end of the second resistance R2 and described
The power end of CAN-BUS conversion chip U1 is connect with the first operating voltage VCC input terminal, and the of the second resistance R2
Two ends, the CAN-BUS conversion chip U1 the connecting node of third signal end be the of the CAN-BUS conversion circuit 120
Three signal ends, the fourth signal end of the CAN-BUS conversion chip U1 are the fourth signal end of CAN-BUS conversion circuit 120, institute
The 5th signal end for stating CAN-BUS conversion chip U1 is the 5th signal end of CAN-BUS conversion circuit 120.
CAN-BUS conversion chip U1 is connecing between MCU controller 110 and physical bus (twisted pair, CANH and CANL)
Mouthful, it is sent for binary code stream to be converted to differential signal, differential signal is converted into binary code stream and is received, it is main to realize
Logic level and " dominant ", the conversion of " recessiveness ".Differential sending function can be provided for bus, provided for MCU controller 110
Differential receive capabilities, the CANH and CAHL of CAN-BUS conversion chip U1 respectively with diagnosis interface 220 CANH and CAHL into
Row connection, the vapour acquired from each sensor of the diagnosis acquisition difference diagnostic signal of interface 220, such as automobile electrically-controlled circuit 210
Vehicle parameter and fault parameter carry out the difference diagnostic signal to be converted to binary code stream being sent to MCU controller 110, simultaneously
Difference diagnosis number is converted to from the reception binary code stream of MCU controller 110 and is sent to diagnosis interface 220, completes Failure elimination
Or other operations.
In the present embodiment, the CAN-BUS conversion chip U1 model TJA1050.
It is handled and newest it should be noted that the design of TJA1050 uses advanced insulating silicon SOI technology
EMX technology, so TJA1050 has a good EMC performance, the compatible 3.3V and 5V device of incoming level is that a kind of have width
The differential receiver of common mode range has high electromagnetic compatibility, provides anti-transient protective to bus pin under automotive environment, prevents
Only pin voltage is excessively high causes scaling loss.
As shown in figure 3, Fig. 3 is hand-held type automobile diagnostic equipment one of the utility model based on CAN-BUS bus communication protocol
The electrical block diagram of power circuit in embodiment, in the present embodiment, the power circuit 130 includes 3rd resistor R3, the
Four resistance R4, the 5th resistance R5, the 6th resistance R6, third capacitor C3, the 4th capacitor C4, the 5th capacitor C5, the 6th capacitor C6,
Seven capacitor C7, power conversion chip U2, first diode D1, inductance L and the second operating voltage VDD input terminal.
Specifically, the first end of the 3rd resistor R3, the first end of the 4th resistance R4, the third capacitor C3
The power end of first end, the first end of the 4th capacitor C4 and the power conversion chip U2 is electric with second work
The connection of VDD input terminal is pressed, the second end of the third capacitor C3 and the second end of the 4th capacitor C4 are grounded, the third
The peak point current input terminal of the second end of resistance R3, the second end of the 4th resistance R4 and the power conversion chip U2 with
The switch receiving end of the power conversion chip U2 connects, the switch transmitting terminal of the power conversion chip U2 and the described 1st
The cathode of pole pipe D1 is connect with the first end of the inductance L, and the first of the second end of the inductance L, the 6th resistance R6
The connecting node of the first end at end, the first end of the 6th capacitor C6 and the 7th capacitor C7 is the power circuit
Power output end, the second end of the 6th resistance R6 and the first end of the 5th resistance R5 are grounded, the 5th resistance
The second end of R5 is connect with the common end of the power conversion chip U2, the timing capacitor end of the power conversion chip U2 and institute
State the 5th capacitor C5 first end connection, the ground terminal of the power conversion chip U2, the 5th capacitor C5 second end,
The second end of the anode of the first diode D1, the second end of the 6th capacitor C6 and the 7th capacitor C7 is grounded.
It should be noted that in the present embodiment, power conversion chip U2 model NCP3063, it can be achieved that decompression, boosting or
Switching frequency can be increased to 190KHZ by the flexible design of reverse phase conversion configurations, NCP3063, and NCP3063 can provide 1.5A's
Peak output voltage can prevent the short circuit in output from leading to device or load permanent damage, in the present embodiment, the second work electricity
Pressure is 5V, stablizes output 3.3V, inductance L and capacitor after power conversion chip U2 conversion for filtering out unnecessary harmonic wave
Signal prevents it from entering the crosstalk for causing signal in MCU controller 110.
Further, referring to Fig. 4, the hand-held type automobile diagnostic equipment based on the above embodiment, in the utility model base
It is described to be based on CAN-BUS bus communication in another embodiment of the hand-held type automobile diagnostic equipment of CAN-BUS bus communication protocol
The hand-held type automobile diagnostic equipment of agreement further includes the FLASH memory 160 flowed for storing data, the FLASH memory 160
It is electrically connected with the MCU controller 110.
It should be noted that the data that MCU controller 110 is exchanged with electrical control circuit 210 are storable in FLASH memory
160, further, when FLASH low memory can also external memory bar carried out the storage of data flow.
In the present embodiment, the hand-held type automobile diagnostic equipment based on CAN-BUS bus communication protocol further includes USB interface
170, the MCU controller 110 is electrically connected by the usb 1 70 with host computer.
It should be noted that when automobile electrically-controlled circuit 210 is when constantly updating progress, it is original to be based on CAN-BUS bus
The hand-held type automobile diagnostic equipment of communication protocol may be unable to satisfy demand, therefore, logical based on CAN-BUS bus in the present embodiment
The hand-held type automobile diagnostic equipment of letter agreement is additionally provided with usb 1 70, can be carried out with computer or host computer by usb 1 70
Connection, to realize system upgrade and the malfunction elimination of itself.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model,
It is all under the inventive concept of the utility model, equivalent structure made based on the specification and figures of the utility model becomes
It changes, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (6)
1. a kind of hand-held type automobile diagnostic equipment based on CAN-BUS bus communication protocol, which is characterized in that including shell, setting
In the intracorporal diagnostic circuit of the shell and setting multiple keys on the housing, the diagnostic circuit include MCU controller,
CAN-BUS conversion circuit, LCD display, key circuit and power circuit；The multiple key electrically connects with the key circuit
It connects, the power circuit, the key circuit and the LCD display are electrically connected with the MCU controller, the MCU
Controller is also electrically connected via the diagnosis interface of the CAN-BUS conversion circuit and automobile, the diagnosis interface and automobile
Electrical control circuit is electrically connected；Wherein,
The CAN-BUS conversion circuit, the failure of data flow and the output of MCU controller for being exported to the electrical control circuit
It eliminates instruction and carries out level conversion, so that the communication between the MCU controller and the electrical control circuit is followed based on CAN-BUS
Bus communication protocol；
The key circuit, for exporting different trigger signals to the MCU controller, in the LCD display into
Error code in the data flow of the row electrical control circuit output is inquired, and the control MCU controller output failure disappears
Except instruction is to the electrical control circuit, to carry out the elimination of failure；
The MCU controller, for carrying out signal communication by the CAN-BUS conversion circuit and the automobile electrically-controlled circuit,
To obtain the data flow of electrical control circuit output, and error code is obtained from the data flow, and by the data flow and institute
It states error code to export to the LCD display, so that the LCD display shows the data flow and the error code
Show.
2. as described in claim 1 based on the hand-held type automobile diagnostic equipment of CAN-BUS bus communication protocol, which is characterized in that
The signal end of the CAN-BUS conversion circuit include the first signal end, second signal end, third signal end, fourth signal end and
5th signal end, the CAN-BUS conversion circuit include CAN-BUS conversion chip, first resistor, second resistance, first capacitor,
Second capacitor and the first operating voltage input terminal；
First signal of the first end of the first resistor, the first end of the first capacitor and the CAN-BUS conversion chip
The connecting node at end is the first signal end of the CAN-BUS conversion circuit, the second end of the first capacitor, second electricity
The ground terminal of the second end of appearance and the CAN-BUS conversion chip is grounded, the second end of the first resistor, second electricity
The connecting node at the second signal end of the second end of appearance and the CAN-BUS conversion chip is the CAN-BUS conversion circuit
The power end of second signal end, the first end of the second resistance and the CAN-BUS conversion chip works with described first
Voltage input end connection, the second end of the second resistance, the CAN-BUS conversion chip third signal end connecting node
Fourth signal end for the third signal end of the CAN-BUS conversion circuit, the CAN-BUS conversion chip turns for CAN-BUS
The fourth signal end of circuit is changed, the 5th signal end of the CAN-BUS conversion chip is the 5th signal of CAN-BUS conversion circuit
End.
3. as claimed in claim 2 based on the hand-held type automobile diagnostic equipment of CAN-BUS bus communication protocol, which is characterized in that
The CAN-BUS conversion chip model TJA1050.
4. as claimed in claim 2 based on the hand-held type automobile diagnostic equipment of CAN-BUS bus communication protocol, which is characterized in that
The power circuit includes 3rd resistor, the 4th resistance, the 5th resistance, the 6th resistance, third capacitor, the 4th capacitor, the 5th electricity
Appearance, the 6th capacitor, the 7th capacitor, power conversion chip, first diode, inductance and the second operating voltage input terminal；
The first end of the 3rd resistor, the first end of the 4th resistance, the first end of the third capacitor, the 4th electricity
The power end of the first end of appearance and the power conversion chip is connect with the second operating voltage input terminal, the third electricity
The second end of appearance and the second end of the 4th capacitor are grounded, and the of the second end of the 3rd resistor, the 4th resistance
The peak point current input terminal of two ends and the power conversion chip is connect with the switch receiving end of the power conversion chip, institute
The cathode of the switch transmitting terminal and the first diode of stating power conversion chip is connect with the first end of the inductance, described
The second end of inductance, the first end of the 6th resistance, the first end of the 6th capacitor and the first end of the 7th capacitor
Connecting node be the power circuit power output end, the first of the second end of the 6th resistance and the 5th resistance
End is grounded, and the second end of the 5th resistance is connect with the common end of the power conversion chip, the power conversion chip
Timing capacitor end connect with the first end of the 5th capacitor, the ground terminal of the power conversion chip, the 5th capacitor
Second end, anode, the second end of the 6th capacitor and the second end of the 7th capacitor of the first diode connect
Ground.
5. the hand-held type automobile diagnostic equipment based on CAN-BUS bus communication protocol as described in claim 1-4 any one,
It is characterized in that, the hand-held type automobile diagnostic equipment based on CAN-BUS bus communication protocol further includes for storing the data
The FLASH memory of stream, the FLASH memory and the MCU controller are electrically connected.
6. as claimed in claim 5 based on the hand-held type automobile diagnostic equipment of CAN-BUS bus communication protocol, which is characterized in that
Hand-held type automobile diagnostic equipment based on CAN-BUS bus communication protocol further includes USB interface, and the MCU controller passes through described
USB interface and host computer are electrically connected.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580502A (en) * | 2020-05-18 | 2020-08-25 | 山东新凌志检测技术有限公司 | OBD diagnostic instrument system applied to motor vehicle environment-friendly detection process |
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- 2018-05-31 CN CN201820838086.9U patent/CN208255712U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111580502A (en) * | 2020-05-18 | 2020-08-25 | 山东新凌志检测技术有限公司 | OBD diagnostic instrument system applied to motor vehicle environment-friendly detection process |
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