CN102385382A - Vehicle fault diagnosis device - Google Patents
Vehicle fault diagnosis device Download PDFInfo
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- CN102385382A CN102385382A CN2011103283494A CN201110328349A CN102385382A CN 102385382 A CN102385382 A CN 102385382A CN 2011103283494 A CN2011103283494 A CN 2011103283494A CN 201110328349 A CN201110328349 A CN 201110328349A CN 102385382 A CN102385382 A CN 102385382A
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Abstract
The invention discloses a vehicle fault diagnosis device and belongs to the field of vehicle fault diagnosis. A data line interface in the vehicle fault diagnosis device is connected with a K line level switch module group; a K line level switch module in the K line level switch module group is respectively connected with a digital control analog switch; the enable signal output end and channel selection signal output end of an encryption controller are respectively connected with the digital control analog switch; the data receiving end of a USB (Universal Serial Bus) controller is respectively connected with the digital control analog switch and the encryption controller; and the data sending end of the USB controller is respectively connected with the digital control analog switch and the encryption controller. In an encryption authentication mode, the data reading safety is guaranteed, and the response speed of the diagnosis system is quickened by arranging different connecting channels; in addition, the vehicle fault diagnosis device has functions of automatically judging the specific type of the vehicle controller and automatically collecting data; and the capability and efficiency for solving faults can be improved.
Description
Technical field
The present invention relates to fault diagnosing apparatus for vehicle, especially a kind of fault diagnosing apparatus for vehicle that can carry out fault diagnosis apace to various dissimilar vehicle control devices.
Background technology
At present, the identical systems of same vehicle often has different systems providers, and the diagnosing protocol that different systems providers provides all can not be general.For example model is the automobile of LF620, and its electric injection system possible configuration Fu Erde or sunlight Tyke system, its ABS system be the universal or evergreen system of possible configuration then, and this supplier's of system of a few family diagnostic software can not be general.When keeping in repair after sale, the maintenance personal can face sizable puzzlement, because the maintenance personal at first must know the configuration-system supplier (being concrete model) of this automobile, could select corresponding diagnostic software that vehicle control device is carried out fault diagnosis.
In addition, traditional car fault diagnosis appearance is generally the hand-held failure diagnostic apparatus, and this kind diagnostic equipment is made up of control chip, touching display screen and storer etc.The user must at first select the type of vehicle control device when using the hand-held failure diagnostic apparatus; Diagnostic equipment reloads corresponding diagnostic routine and diagnoses; So the response speed of diagnostic equipment is slow and exist while observation data amount few, the shortcoming that the read failure code function is single.
Summary of the invention
The purpose of this invention is to provide a kind of fault diagnosing apparatus for vehicle; It can be provided with different interface channels according to the concrete model or the type of vehicle control device through encrypted master; Needn't load corresponding diagnostic routine after selecting vehicle control device each, accelerate the response speed of diagnostic system, and diagnostic software of PC diagnostic software can carry out encrypting and authenticating when being connected with data line; Through the mode of encrypting and authenticating, guaranteed the security that data read.
To achieve these goals; The invention provides a kind of fault diagnosing apparatus for vehicle; It is characterized in that: comprise data line interface, K line level switch module group, digital control analog switch, USB controller and USB connector; Wherein said data line interface is connected with said K line level switch module group; K line level switch module is connected with said digital control analog switch respectively in the said K line level switch module group; The enable signal output terminal of said encrypted master, channel selecting signal output terminal connect said digital control analog switch respectively, and the data receiver of said USB controller connects said digital control analog switch, said encrypted master respectively, and data sending terminal connects said digital control analog switch, said encrypted master respectively;
Said data line interface is used to connect the vehicle diagnostics interface;
All to be used for K line level conversion be the serial port logic level to K line level switch module in the said K line level switch module group;
Said digital control analog switch is used to receive enable signal and the channel selecting signal that said encrypted master sends; And according to said enable signal and channel selecting signal corresponding passage is set, makes that corresponding K line level switch module is communicated with in data receiver, data sending terminal and the said K line level switch module group of said USB controller;
Said encrypted master is used to send enable signal and channel selecting signal is given said digital control analog switch, controls said digital control analog switch corresponding SELCH is set, and realize the encrypting and authenticating between PC diagnostic software and the data line;
Said USB controller is used to control the usb communication agreement, and said serial port logic level conversion is become the USB logic level;
Said USB connector is used to connect the USB socket of PC.
Holding circuit is connected with said data line interface, is used for overvoltage and power supply reverse connecting protection.
Said K line level switch module group is selected 4 K line level switch modules for use, and said digital control analog switch is selected the digital control analog switch of difference 4 passages for use.
In sum, owing to adopted technique scheme, the invention has the beneficial effects as follows:
Whether 1, detect data line automatically connects with the PC diagnostic software;
Can carry out encrypting and authenticating when 2, the PC diagnostic software is connected with data line,, guarantee the security that data read through the mode of encrypting and authenticating;
3, according to the concrete model or the type of vehicle control device different interface channels is set through encrypted master, needn't loads corresponding diagnostic routine after selecting vehicle control device, accelerate the response speed of diagnostic system each;
4, do not know the situation of the concrete model of vehicle control device to operating personnel, can judge its concrete model automatically, avoided the wrong diagnosis that selects the concrete model of a controller of giving another the right of way to bring because of operating personnel simultaneously according to the type of vehicle control device;
5, PC diagnostic software and vehicle control device set up online after; The user can select automatic data acquisition; The PC diagnostic software reads identification information, failure message and the traffic flow information of vehicle control device successively, and with its etc. be saved in order automatically in the data file, the vehicle maintenance personnel can send to the technical support personnel with this data file; By the technical support personnel it is analyzed, thereby improved the ability and the efficient of dealing with problems;
When 6, the PC diagnostic software reads the failure message of vehicle control device; Failure message demonstrates the concrete implication of each failure code; The pin annexation of corresponding part of fault and vehicle control device; And the specifications parameter of troubleshooting methodology, fault parts, thereby improved the ability that the vehicle maintenance personnel investigate the vehicle control device fault.
Description of drawings
The present invention will explain through example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is the circuit theory diagrams of this fault diagnosing apparatus for vehicle among the present invention;
Fig. 2 is the circuit diagram of 4 road K line level switch modules in the first embodiment of the present invention;
Fig. 3 is the circuit diagram of data line interface and holding circuit in the first embodiment of the present invention;
Fig. 4 is the circuit diagram of digital control analog switch in the first embodiment of the present invention, encrypted master, USB controller and USB connector;
Fig. 5 is the process flow diagram of this car fault diagnosis method among the present invention;
Fig. 6 is that the PC diagnostic software is connected with data line and the process flow diagram of encrypting and authenticating process among the present invention;
Fig. 7 is the process flow diagram of passage setting up procedure among the present invention;
Fig. 8 is the process flow diagram of PC diagnostic software and vehicle control device in-line procedure among the present invention.
Embodiment
Disclosed all characteristics in this instructions, or the step in disclosed all methods or the process except mutually exclusive characteristic and/or the step, all can make up by any way.
Disclosed arbitrary characteristic in this instructions (comprising any accessory claim, summary and accompanying drawing) is only if special narration all can be replaced by other equivalences or the alternative features with similar purpose.That is, only if special narration, each characteristic is an example in a series of equivalences or the similar characteristics.
As shown in Figure 1; This fault diagnosing apparatus for vehicle is made up of data line interface, K line level switch module group, digital control analog switch, holding circuit, encrypted master, USB controller and USB connector; Wherein this data line interface connects K line level switch module group, holding circuit; Each K line level switch module connects digital control analog switch respectively in the K line level switch module group; Enable signal output terminal, the channel selecting signal output terminal of encrypted master connect digital control analog switch respectively; The data receiver RXD of USB controller is connected with encrypted master, digital control analog switch respectively, and data sending terminal TXD is connected with encrypted master, digital control analog switch respectively.
Data line interface is used to connect the vehicle diagnostics interface; To be used for K line level conversion be the serial port logic level to K line level switch module in the K line level switch module group; Digital control analog switch is used to receive enable signal and the channel selecting signal that encrypted master sends; And according to this enable signal and channel selecting signal corresponding SELCH is set, makes that corresponding K line level switch module is communicated with in data receiver RXD, data sending terminal TXD and this K line level switch module group of USB controller; Encrypted master is used to send enable signal and channel selecting signal is given digital control analog switch; Control figure control analog switch is provided with corresponding SELCH; And the encryption of completion and diagnostic software of PC diagnostic software contrast; Only could operate as normal when the result of calculation of the result of calculation of encrypted master and diagnostic software of PC diagnostic software is identical, otherwise be in the lock state, promptly realized the encrypting and authenticating between PC diagnostic software and the data line; The USB controller is used to control the usb communication agreement, and the serial port logic level conversion is become the USB logic level; The USB connector is used to connect the USB socket of PC.
In one embodiment of the invention, select 4 K line level switch modules in the K line level switch module group for use, promptly have four alternative paths in the present embodiment.Shown in Fig. 2～4; The port one of data line interface J2, port 2, port 3 are respectively applied for and connect the vehicle diagnostics interface; Port 4, port 5 ground connection; Port 7, port 9, port one 2, port one 3 connect the input end of 4 road K line level switch modules respectively, i.e. the K_D port of the K_C port of the K_B port of the K_A port of K line level switch module U1, K line level switch module U2, K line level switch module U3, K line level switch module U4.The VBAT port of data line interface is connected with the voltage stabilizing diode Z1 of ground connection; And the diode D1 through forward is connected with first sys node of capacitor C 1, capacitor C 2; Wherein first sys node of capacitor C 1, capacitor C 2 also connects the VBB port of each K line level switch module, and its second sys node ground connection.
Digital control analog switch is selected the digital control analog switch U5 of difference 4 passages of model 4052 for use in the present embodiment; It has A, two scale-of-two input ports of B and an INH input port; Wherein A, the input of B port are used for the channel selecting signal that control channel is selected; INH port input enable signal, when enable signal was " 1 ", all passages all ended.The RX_A port of K line level switch module U1, TX_A port connect digital control analog switch U5 respectively in the K line level switch module group X0 port, Y0 port; X1 port, Y1 port that the RX_B port of K line level switch module U2, TX_B port connect digital control analog switch U5 respectively; X2 port, Y2 port that the RX_C port of K line level switch module U3, TX_C port connect digital control analog switch U5 respectively, X3 port, Y3 port that the RX_D port of K line level switch module U4, TX_D port connect digital control analog switch U5 respectively.The INH input port of digital control analog switch connects the enable signal output terminal of encrypted master U6, and A, B input port connect the channel selecting signal input end of encrypted master U6.The data receiver RXD of USB controller U7 connects the X port of digital control analog switch and the data sending terminal of encrypted master U6 respectively, and the data sending terminal TXD of USB controller U7 connects the Y port of digital control analog switch U5 and the data receiver of encrypted master U6 respectively.
As shown in Figure 5, this car fault diagnosis method is made up of following steps among the present invention.
Whether S10, PC diagnostic software detect data line automatically and are connected with it, connect then repeat detection if detect, connect then encrypting and authenticating time threshold values between initialization PC diagnostic software and the data line if detect;
S11, PC diagnostic software send such as the random number of 8 bytes and give encrypted master; Encrypted master adopts the AES identical with the PC diagnostic software that this random number is carried out computations; And result of calculation is exported to the PC diagnostic software; The PC diagnostic software compares this result of calculation and the result that himself calculates; Whether expression further judges the encrypting and authenticating time above encrypting and authenticating time threshold values, if judgement surpasses encrypting and authenticating time threshold values then repeats this step through encrypting and authenticating if comparing result is unequal if comparing result equates; If judgement surpasses encrypting and authenticating time threshold values then representes that encrypting and authenticating does not pass through, the PC diagnostic software quits work and makes miscue.Through the mode of encrypting and authenticating, guaranteed the security that data read.
S30, PC diagnostic software are according to the concrete model of vehicle control device or type calculating K line options passage and with the failure counter zero clearing;
S31, PC diagnostic software send corresponding passage and order are set to encrypted master; Encrypted master judges whether passage is provided with order correct; If said passage be provided with order correctly send just responding to said PC diagnostic software and said just responding to send accomplish the back and import enable signal and channel selecting signal to digital control analog switch; Corresponding passage is set; Enable signal is set to logic low when in the first embodiment of the present invention, respective channel being set, and digital control analog switch is selected different passages according to the Different Logic level of the channel selecting signal that receives;
If it is incorrect that the said passage of S32 is provided with order; The count value of the further failure judgement counter of then said encrypted master whether>=N: if the count value>=N of said failure counter then reminder-data line passage is provided with mistake; If the count value of said failure counter<1 then failure counter adds 1 and send Negative Acknowledgment and give said PC diagnostic software; Repeating said steps S31～S32, wherein N is the integer greater than 1, the value of N includes but not limited to 3 times among the present invention.Through different interface channels is set, needn't behind each selection vehicle control device, load corresponding diagnostic routine, accelerated the response speed of diagnostic system.
If the online success of said PC diagnostic software and vehicle control device then PC diagnostic software output error prompting.
Wherein, When the user imports the type of vehicle control device; The PC diagnostic software judges that automatically the detailed process of the concrete model of vehicle control device is: the PC diagnostic software is dissimilar according to vehicle control device; Select different recognition commands to send to vehicle control device; Said vehicle control device sends the corresponding response data and gives the PC diagnostic software, and the concrete model of vehicle control device is judged according to the byte number of said response data by the PC diagnostic software, obtains end operation after the concrete model of vehicle control device in the PC diagnostic software.Through obtaining the concrete model of vehicle control device automatically, can solve the problem of the unclear concrete model of user, and avoid owing to concrete model is selected the wrong wrong diagnosis that causes.
When the PC diagnostic software reads the failure message of vehicle control device; Said failure message demonstrates the concrete implication of each failure code; The pin annexation of corresponding part of fault and vehicle control device; And the specifications parameter of troubleshooting methodology, fault parts, thereby improved the ability that the vehicle maintenance personnel investigate the vehicle control device fault.
The present invention is not limited to aforesaid embodiment.The present invention expands to any new feature or any new combination that discloses in this manual, and the arbitrary new method that discloses or step or any new combination of process.
Claims (3)
1. fault diagnosing apparatus for vehicle; It is characterized in that: comprise data line interface, K line level switch module group, digital control analog switch, USB controller and USB connector; Wherein said data line interface is connected with said K line level switch module group; K line level switch module is connected with said digital control analog switch respectively in the said K line level switch module group; The enable signal output terminal of said encrypted master, channel selecting signal output terminal connect said digital control analog switch respectively; The data receiver of said USB controller connects said digital control analog switch, said encrypted master respectively, and data sending terminal connects said digital control analog switch, said encrypted master respectively;
Said data line interface is used to connect the vehicle diagnostics interface;
All to be used for K line level conversion be the serial port logic level to K line level switch module in the said K line level switch module group;
Said digital control analog switch is used to receive enable signal and the channel selecting signal that said encrypted master sends; And according to said enable signal and channel selecting signal corresponding passage is set, makes that corresponding K line level switch module is communicated with in data receiver, data sending terminal and the said K line level switch module group of said USB controller;
Said encrypted master is used to send enable signal and channel selecting signal is given said digital control analog switch, controls said digital control analog switch corresponding SELCH is set, and realize the encrypting and authenticating between PC diagnostic software and the data line;
Said USB controller is used to control the usb communication agreement, and said serial port logic level conversion is become the USB logic level;
Said USB connector is used to connect the USB socket of PC.
2. fault diagnosing apparatus for vehicle according to claim 1 is characterized in that: holding circuit is connected with said data line interface, is used for overvoltage and power supply reverse connecting protection.
3. fault diagnosing apparatus for vehicle according to claim 1 and 2 is characterized in that: said K line level switch module group is selected 4 K line level switch modules for use, and said digital control analog switch is selected the digital control analog switch of difference 4 passages for use.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110328349.4A CN102385382B (en) | 2011-10-24 | 2011-10-26 | Vehicle fault diagnosis device |
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110325551 | 2011-10-24 | ||
| CN201110325551.1 | 2011-10-24 | ||
| CN201110328349.4A CN102385382B (en) | 2011-10-24 | 2011-10-26 | Vehicle fault diagnosis device |
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| Publication Number | Publication Date |
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| CN102385382A true CN102385382A (en) | 2012-03-21 |
| CN102385382B CN102385382B (en) | 2014-01-08 |
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| CN201110328349.4A Expired - Fee Related CN102385382B (en) | 2011-10-24 | 2011-10-26 | Vehicle fault diagnosis device |
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| CN103935310A (en) * | 2014-04-11 | 2014-07-23 | 上海新储集成电路有限公司 | Vehicle-mounted diagnosis code transmission system based on cigar lighter and transmission method thereof |
| CN104678844A (en) * | 2015-01-23 | 2015-06-03 | 深圳市元征科技股份有限公司 | Equipment diagnosis joint and equipment diagnosis method |
| TWI497047B (en) * | 2014-04-09 | 2015-08-21 | Icm Inc | Vehicle spare parts testing and verification equipment |
| CN105179134A (en) * | 2015-10-12 | 2015-12-23 | 中国第一汽车股份有限公司无锡油泵油嘴研究所 | Common rail system fault diagnosis system |
| CN108445860A (en) * | 2018-01-31 | 2018-08-24 | 深圳市元征科技股份有限公司 | Diagnostic device, diagnosis request processing method and computer readable storage medium |
| CN112540590A (en) * | 2019-09-23 | 2021-03-23 | 北京轻享科技有限公司 | Vehicle fault detection method, device and system |
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Address after: 400037 Chongqing city Beibei District caijiagang Zhen Tong Xing Industrial Park Fengqi Road No. 16 Patentee after: Lifan Industry (Group) Co., Ltd. Address before: 400037 Chongqing city Shapingba District No. 60 Zhangjiawan Bridge Patentee before: Lifan Industry (Group) Co., Ltd. |
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Granted publication date: 20140108 Termination date: 20191026 |