CN103454947A - Vehicle diagnosis code-reading device - Google Patents
Vehicle diagnosis code-reading device Download PDFInfo
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- CN103454947A CN103454947A CN201310397146XA CN201310397146A CN103454947A CN 103454947 A CN103454947 A CN 103454947A CN 201310397146X A CN201310397146X A CN 201310397146XA CN 201310397146 A CN201310397146 A CN 201310397146A CN 103454947 A CN103454947 A CN 103454947A
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Abstract
The invention provides a vehicle diagnosis code-reading device. The vehicle diagnosis code-reading device comprises an MCU and a CAN bus interface module which is electrically connected with the MCU, the CAN bus interface module is electrically connected with a vehicle ECU diagnosis interface through a diagnosis interface driving module, the MCU is used for analyzing and processing diagnosis data, the CAN bus interface module is used for receiving and sending the data according to CAN communication protocols, and the diagnosis interface driving module is used for achieving data transmission with a vehicle ECU. The vehicle diagnosis code-reading device is applicable to personal car owners and users who like DIY, low in cost, small and exquisite in appearance, convenient to carry, concise in interface and easy to operate. The vehicle diagnosis code-reading device achieves a plurality of most commonly used functions, such as fault code reading, fault code elimination and data flow reading, of vehicle computer diagnosis equipment, and meets the standard of OBD II communication protocols.
Description
Technical field
The present invention relates to the vehicle diagnosis technical field, relate in particular to a kind of vehicle diagnosis code-reading apparatus.
Background technology
Along with the high speed development of automobile industry, the continuous of home-use car popularized, and the Related product of living after automobile also forms great market.The automobile failure diagnosis series products as automobile after the most important components of life Related product, along with the development of automobile industry, popularized rapidly.
Existing automobile failure diagnosis series products has two large weakness: the one, and this series products is all to be built by larger-size discrete component, general bigger than normal the laying particular stress on of small product size; The 2nd, this series products is only supported the compatible vehicle of OBDII/EOBD agreement basically.Excessive small product size seriously limits its use face, can not meet the user demand of commercialization, civilian or government's associated mechanisms.
Summary of the invention
The object of the present invention is to provide a kind of low cost, small size, vehicle diagnosis code-reading apparatus easy to carry, simple to operate.
The objective of the invention is to be achieved through the following technical solutions.
A kind of vehicle diagnosis code-reading apparatus comprises: MCU, and the CAN bus interface module be electrically connected to MCU; Described CAN bus interface module is electrically connected to the automobile ECU diagnose interface by the diagnose interface driver module;
Described MCU is for carrying out analyzing and processing to diagnostic data;
Described CAN bus interface module is for completing reception and the transmission of data according to the CAN communications protocol;
Described diagnose interface driver module is for realizing and the automobile ECU data transmission.
Further preferably, also comprising power supply control modular converter, is required 3.3V voltage for the 12V voltage transitions that the vehicle diagnosis interface is provided.
Described power supply is controlled modular converter one end and is electrically connected to the automobile ECU diagnose interface, and the other end is through low pressure difference linear voltage regulator and usb interface module; Described usb interface module is electrically connected to MCU.
Further preferably, described usb interface module, for external PC equipment, is realized data transmission.
Further preferably, also comprise the JTAG debugging interface module be electrically connected to described MCU, function debugging when described JTAG debugging interface module is used for developing, program compiled online.
Further preferably, also comprise the FLASH memory module be electrically connected to MCU, for store diagnostic program.
Further preferably, also comprise the LCD display module be electrically connected to MCU, for showing diagnostic result.
Further preferably, also comprise and MCU keystroke handling module, that described keystroke handling module comprises is definite, return and function button, for realizing diagnosing the reading code operational order.
Compared with prior art, beneficial effect is in the present invention: vehicle diagnosis code-reading apparatus provided by the invention, and the user group who is adapted to individual car owner and likes DIY, low cost, profile is small and exquisite, is convenient for carrying, simple interface, simple to operate.Contain the several the most frequently used functions of Development in Vehicle On-Board Diagnostics equipment: Read fault code, clear diagnostic trouble code, time data stream and meet standard OBD II communicaton protocol.
The accompanying drawing explanation
Fig. 1 is vehicle diagnosis code-reading apparatus theory diagram of the present invention;
Fig. 2 is CAN bus interface module circuit theory diagrams of the present invention;
Fig. 3 is diagnose interface driver module circuit theory diagrams of the present invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Refer to shown in Fig. 1, vehicle diagnosis code-reading apparatus of the present invention comprises: MCU (CPU (central processing unit)) integrated chip, and the CAN bus interface module be electrically connected to MCU;
Described MCU is for carrying out analyzing and processing to diagnostic data;
Described diagnose interface driver module is for realizing and the automobile ECU data transmission.
Described CAN bus interface module completes reception and the transmission of data according to the CAN communications protocol, in concrete the present invention, refer to shown in Fig. 2, and the CAN bus interface module selects MCP2515 as the CAN controller, and TJA1050T is as the CAN transceiver.
Wherein: U8 is CAN controller MCP2515, and it is connected with MCU by the SPI mouth, separately has 3 control lines to be respectively: CAN_RST, CAN_CS, CAN_INT; CAN_RST is that the CAN controller resets and controls mouthful, and during low level, the CAN controller resets; CAN_CS is CAN controller sheet selected control donsole, and during low level, the SPI communication is effective; CAN_INT is the interrupt output mouth, for interrupting, detects.
U7 position CAN transceiver TJA1050T, R51 is the slope controlling resistance, if the CAN transceiver is operated in fast mode, at this resistance, does not need, and the direct ground connection of the 8th pin of TJA1050T is got final product, in this application, the CAN transceiver is operated in low-speed mode.C25, C26 are for the low-pass filtering on the CAN connection.R49, R50 are the terminal build-out resistor, select representative value 62 Ω.D2, D3 are the esd protection diode, for preventing the contact discharge produced in the wiring process.
Described CAN bus interface module is electrically connected to the automobile ECU diagnose interface by the diagnose interface driver module, to realize data interaction.
Particularly, refer to shown in Fig. 3, the diagnose interface driver module completes reception and the transmission of data by microcontroller serial port according to the K-Line communications protocol.The conversion of serial ports level forms comparer by LM2903 and switch triode and completes.
Wherein: complete the conversion of level while sending data by R4, Q2, R2, R3, Q3, R7, R8, during due to the K-Line transceiving data, electric current is larger, so the resistance of Q3 collector is selected the mode of two parallel connections; Complete level conversion by U4 (LM2903) comparer while receiving data.
Further, also comprise power supply control modular converter, described power supply is controlled modular converter one end and is electrically connected to the automobile ECU diagnose interface, and the other end is electrically connected to usb interface module and JTAG debugging interface module respectively through low pressure difference linear voltage regulator (LDO, low dropout regulator); Described usb interface module and JTAG debugging interface module are electrically connected to MCU respectively.
Described power supply is controlled modular converter and is converted to the required 3.3V power supply of described diagnostic device for the 12V power supply that the automobile ECU diagnose interface is provided.
Described usb interface module, for equipment such as external PC, is realized data transmission.
Function debugging when described JTAG debugging interface module is used for developing, the program compiled online.
Further, also comprise FLASH memory module, LCD display module and the keystroke handling module be electrically connected to MCU respectively.
Described FLASH memory module is for store diagnostic program, this diagnostic routine comprises OBD II/EOBD standard diagnostic routines and bicycle system/type wide diagnosis program, respectively corresponding OBDII/EOBD Standard of vehicle diagnostic function and bicycle system/type vehicle diagnosis function.
Described LCD display module, for showing diagnostic result, is selected 3.O cun LCD color screen display screen in the present embodiment, its resolution is 400 * 240, in order to better show diagnostic result.
That described keystroke handling module comprises is definite, return and function button, for realizing diagnosing the reading code operational order.
Vehicle diagnosis code-reading apparatus provided by the invention specifically comprises following function:
1. Read fault code: show from ECU, return when the toe lasting diagnostic trouble code, inquire about this diagnostic trouble code definition in FLASH simultaneously, the current automobile storage of prompting user fault.
2. removing diagnostic trouble code: maintenance job completes, and, after the fault eliminating, the fault-signal existed in automobile computer need to be removed, and sending the order of removing diagnostic trouble code by this equipment to automobile ECU can carry out.
3. dynamic dataflow: carry out data interaction with ECU, obtain motoring condition, show in real time engine current data stream.
4. read vehicle VIN code.
Vehicle diagnosis code-reading apparatus provided by the invention, the user group who is adapted to individual car owner and likes DIY, low cost, profile is small and exquisite, is convenient for carrying, simple interface, simple to operate.Contain the several the most frequently used functions of Development in Vehicle On-Board Diagnostics equipment: Read fault code, clear diagnostic trouble code, time data stream and meet standard OBD II communicaton protocol.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a vehicle diagnosis code-reading apparatus, is characterized in that, comprising: MCU, and the CAN bus interface module be electrically connected to MCU; Described CAN bus interface module is electrically connected to the automobile ECU diagnose interface by the diagnose interface driver module;
Described MCU is for carrying out analyzing and processing to diagnostic data;
Described CAN bus interface module is for completing reception and the transmission of data according to the CAN communications protocol;
Described diagnose interface driver module is for realizing and the automobile ECU data transmission.
2. vehicle diagnosis code-reading apparatus as claimed in claim 1, is characterized in that, also comprises power supply control modular converter, for the 12V voltage transitions that the vehicle diagnosis interface is provided, is required 3.3V voltage.
Described power supply is controlled modular converter one end and is electrically connected to the automobile ECU diagnose interface, and the other end is through low pressure difference linear voltage regulator and usb interface module; Described usb interface module is electrically connected to MCU.
3. vehicle diagnosis code-reading apparatus as claimed in claim 2, is characterized in that, described usb interface module, for external PC equipment, is realized data transmission.
4. vehicle diagnosis code-reading apparatus as claimed in claim 2, is characterized in that, also comprises the JTAG debugging interface module be electrically connected to described MCU, function debugging when described JTAG debugging interface module is used for developing, program compiled online.
5. vehicle diagnosis code-reading apparatus as claimed in claim 1, is characterized in that, also comprises the FLASH memory module be electrically connected to MCU, for store diagnostic program.
6. vehicle diagnosis code-reading apparatus as claimed in claim 1, is characterized in that, also comprises the LCD display module be electrically connected to MCU, for showing diagnostic result.
7. vehicle diagnosis code-reading apparatus as claimed in claim 1, is characterized in that, also comprises and MCU keystroke handling module, and that described keystroke handling module comprises is definite, return and function button, for realizing diagnosing the reading code operational order.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310397146XA CN103454947A (en) | 2013-08-28 | 2013-08-28 | Vehicle diagnosis code-reading device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310397146XA CN103454947A (en) | 2013-08-28 | 2013-08-28 | Vehicle diagnosis code-reading device |
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| CN103454947A true CN103454947A (en) | 2013-12-18 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103914060A (en) * | 2014-03-17 | 2014-07-09 | 深圳市元征科技股份有限公司 | OBDII code reading card device |
| CN106933218A (en) * | 2017-04-25 | 2017-07-07 | 重庆市创锦程科技有限公司 | It is adapted to the multi-protocols diagnostic module and its control method of OBD interfaces |
| CN113176743A (en) * | 2021-03-25 | 2021-07-27 | 四川百纳科技有限责任公司 | CAN network physical layer diagnosis resistance self-adaptive circuit and method |
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| CN101334764A (en) * | 2008-07-24 | 2008-12-31 | 北京创毅视讯科技有限公司 | Interface device and voltage processing method based on the interface device |
| CN201298173Y (en) * | 2008-07-14 | 2009-08-26 | 深圳市元征软件开发有限公司 | Vehicle diagnosis device for displaying vehicle diagnosis information by palm computer product |
| CN102291075A (en) * | 2011-06-24 | 2011-12-21 | 浙江理工大学 | Integrated circuit for driving and control three groups of stepper motors |
| CN202257266U (en) * | 2011-09-30 | 2012-05-30 | 唐泉 | Automobile remote monitoring system including memory unit |
| CN202836971U (en) * | 2012-08-29 | 2013-03-27 | 桂林金铭和智控科技有限公司 | Engine state monitoring and fault diagnosis module |
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2013
- 2013-08-28 CN CN201310397146XA patent/CN103454947A/en active Pending
Patent Citations (5)
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| CN201298173Y (en) * | 2008-07-14 | 2009-08-26 | 深圳市元征软件开发有限公司 | Vehicle diagnosis device for displaying vehicle diagnosis information by palm computer product |
| CN101334764A (en) * | 2008-07-24 | 2008-12-31 | 北京创毅视讯科技有限公司 | Interface device and voltage processing method based on the interface device |
| CN102291075A (en) * | 2011-06-24 | 2011-12-21 | 浙江理工大学 | Integrated circuit for driving and control three groups of stepper motors |
| CN202257266U (en) * | 2011-09-30 | 2012-05-30 | 唐泉 | Automobile remote monitoring system including memory unit |
| CN202836971U (en) * | 2012-08-29 | 2013-03-27 | 桂林金铭和智控科技有限公司 | Engine state monitoring and fault diagnosis module |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103914060A (en) * | 2014-03-17 | 2014-07-09 | 深圳市元征科技股份有限公司 | OBDII code reading card device |
| CN106933218A (en) * | 2017-04-25 | 2017-07-07 | 重庆市创锦程科技有限公司 | It is adapted to the multi-protocols diagnostic module and its control method of OBD interfaces |
| CN113176743A (en) * | 2021-03-25 | 2021-07-27 | 四川百纳科技有限责任公司 | CAN network physical layer diagnosis resistance self-adaptive circuit and method |
| CN113176743B (en) * | 2021-03-25 | 2022-11-15 | 四川百纳科技有限责任公司 | CAN network physical layer diagnosis resistance self-adaptive circuit and method |
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Application publication date: 20131218 |