CN104135267A - A device for reading CAN bus data - Google Patents
A device for reading CAN bus data Download PDFInfo
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- CN104135267A CN104135267A CN201410372550.6A CN201410372550A CN104135267A CN 104135267 A CN104135267 A CN 104135267A CN 201410372550 A CN201410372550 A CN 201410372550A CN 104135267 A CN104135267 A CN 104135267A
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Abstract
The present invention discloses a device for reading CAN bus data, and the device includes: a housing, with at least one connecting element disposed on a first side and a plurality of articulating elements disposed on a second side, wherein the connecting element is hinged with two parts of the housing and the housing is articulated on a CANH bus and a CANL bus through the articulating elements; a group of CANH bus via holes and a group of CANL bus via holes are disposed at two ends of the housing, respectively, the CANH bus and the CANL bus pass through the CANH bus via holes and the CANL bus via holes and out of the housing, respectively; a data sensor and a print circuit plate, which includes an operational amplifier module, are further disposed in the housing, the data sensor senses a CANH bus signal and a CANL bus signal from the CANH bus and the CANL bus, respectively, transfers the CANH bus signal and the CANL bus signal to the operational amplifier module, and transfers the amplified CANH bus signal and the CANL bus signal to a CAN receiving terminal through a CAN data output interface on the housing. The present invention can read the data on the CAN bus without breaking the CAN bus, and will not have any negative impact on the CAN bus.
Description
Technical field
The present invention relates to read the equipment of data in CAN bus, particularly the fetch equipment of data in the CAN bus on a kind of automobile.
Background technology
CAN is (the Controller Area Network of controller local area network, CAN) abbreviation, being to have developed by researching and developing and produce automobile electronics famous German BOSCH companies, and finally becoming international standard (ISO11898), is one of most widely used fieldbus in the world.In North America and West Europe, CAN bus protocol has become the STD bus of Computer Controlled System for Vehicle and built-in industrial control area net（CAN）, and has the J1939 agreement that aims at high capacity waggon and the design of heavy industry motor vehicles and machines taking CAN as underlying protocol.
CAN bus is connected with physical bus with CANL by two output CANH of CAN transceiver interface chip 82C250, and the state of CANH end can only be high level or suspended state, and CANL end can only be low level or suspended state.This just ensures can, in the phenomenon appearing in RS-485 network, not work as system wrong, while occurring that multinode sends data to bus simultaneously, causes bus to present short circuit, thereby damages the phenomenon of some node.And CAN node has and automatically close output function in the situation that mistake is serious, so that the operation of other nodes is unaffected in bus, thereby ensureing there will not be resembles in network, because nodes individually go wrong, makes bus in " deadlock " state.And the perfect communication protocol that CAN has can be realized by CAN controller chip and interface chip thereof, thereby greatly reduces system development difficulty, has shortened the construction cycle, these are only to have the RS-485 of electric agreement incomparable.
The mode that reads at present CAN bus on car is that the insulating barrier of two lines (two lines of CANH and CANL) CAN removes a part, exposing metal wire flatiron welding etc. sets up physical connection mode and reads CAN bus data, this kind of mode has destructiveness to CAN bus, damage bus crust, increase short-circuit risks, if in addition by line wrong, for example to refute the line connecing be not CAN bus, be other bus, likely can cause serious consequence.
In view of this, this area inventor, for the problems referred to above, provides a kind of device of the CAN of reading bus data.
Summary of the invention
The invention provides a kind of device of the CAN of reading bus data, overcome the difficulty of prior art, provide a kind of CAN bus of need not destroying the data in CAN bus can be read out, and can not produce on CAN bus a kind of equipment of any impact.
The device that the invention provides a kind of CAN of reading bus data, comprising:
Shell, the first side is provided with at least one connector, and the second side is provided with some buckle assemblies, two parts of the hinged described shell of described connector, and by described buckle assembly, described shell is fastened in a CANH bus and a CANL bus;
The two ends of described shell are respectively equipped with one group of CANH bus via hole and one group of CANL bus via hole, and described CANH bus and CANL bus pass described shell through CANH bus via hole and CANL bus via hole respectively;
The printed circuit board (PCB) that is also provided with data pick-up and comprises operation amplifier module in described shell, described data pick-up induces CANH bus signals and CANL bus signals from described CANH bus and CANL bus respectively, transfer to described operation amplifier module, after amplifying, transfer to a CAN receiving terminal by the CAN data output interface on described shell.Described printed substrate has an operation amplifier module, amplifies processing for the signal that CAN bus is induced, and a CAN transceiver, for the CAN bus data of reading is sent to receiving terminal.
In described operation amplifier module, a CANH input is connected serially to the positive input of one first operational amplifier by one second electric capacity, one the 4th resistance; One CANL input is connected serially to the reverse input end of described the first operational amplifier by one first electric capacity, one the 3rd resistance; The reverse input end of described the first operational amplifier is connected to the output of described the first operational amplifier by one the 6th resistance; The output of described the first operational amplifier connects the reverse input end of one second operational amplifier, and the positive input of described the second operational amplifier is connected to the output of described the second operational amplifier by one the 9th resistance; The output of described the second operational amplifier is connected to described CAN receiving terminal.
Preferably, the node between described the first electric capacity and the 3rd resistance is connected to the first power supply by one first resistance.
Preferably, the node between described the second electric capacity and the 4th resistance is connected to the first power supply by one second resistance.
Preferably, the node between described the 4th resistance and the positive input of the first operational amplifier is connected to the first power supply by one the 5th resistance.
Preferably, described the first power supply is 2.5V.
Preferably, the positive input of described the second operational amplifier is connected to second source by one the 7th resistance.
Preferably, described second source is 5V.
Preferably, the positive input of described the second operational amplifier is by one the 8th grounding through resistance.
Preferably, described CAN data output interface is arranged between the CANH bus via hole and CANL bus via hole of described shell one end.
Owing to having adopted above-mentioned technology, compared with prior art, the device of the CAN of reading bus data of the present invention can carry out data to target vehicle-mounted CAN bus and read a kind of device that reads CAN bus data of the present invention easily.This CAN bus data fetch equipment can also be applied on other equipment that need to use CAN bus.
The present invention has following advantage and good effect: it is more convenient to install and use, and is applicable to the CAN bus on all devices, comprises automobile but is not limited to automobile; 100% the data that accurately read CAN bus; 100% Noninvasive technology; The safe and reliable reading of CAN bus data, not welding, line cutting or crimping; On the data in CAN bus without any impact.Further illustrate the present invention below in conjunction with drawings and Examples.
Brief description of the drawings
Fig. 1 is the schematic diagram of the device that reads CAN bus data of the present invention;
Fig. 2 is the circuit diagram of operation amplifier module and CAN transceiver in the present invention; And
Fig. 3 is the use view of the device that reads CAN bus data of the present invention.
Reference numeral
1 CANH bus via hole
2 CANL bus via holes
3 connectors
4 CAN data output interfaces
5 printed circuit board (PCB)s
6 buckle assemblies
7 shells
10 read the device of CAN bus data
11 car running computers
12 CAN receiving terminals
13 recorders
14 speed changers
20 CANH buses
21 CANL buses
R1 the first resistance
R2 the second resistance
R3 the 3rd resistance
R4 the 4th resistance
R5 the 5th resistance
R6 the 6th resistance
R7 the 7th resistance
R8 the 8th resistance
R9 the 9th resistance
R10 the tenth resistance
C1 the first electric capacity
C2 the second electric capacity
U2A the first operational amplifier
U2B the second operational amplifier
U1 CAN transceiver circuit
U2 operation amplifier modular circuit
Embodiment
Introduce a kind of specific embodiment of the present invention below by Fig. 1 to 3.
Embodiment 1
As shown in Fig. 1 to 2, a kind of device that reads CAN bus data of the present invention, comprise shell 7, the first side is provided with at least one connector 3, the second side is provided with some buckle assemblies 6, two parts of the hinged described shell 7 of described connector 3, and by described buckle assembly 6, described shell 7 is fastened in a CANH bus and a CANL bus; The two ends of described shell 7 are respectively equipped with one group of CANH bus via hole 1 and one group of CANL bus via hole 2, and described CANH bus 20 and CANL bus 21 pass described shell 7 through CANH bus via hole 1 and CANL bus via hole 2 respectively.
The printed circuit board (PCB) 5 that is also provided with data pick-up (not shown) and comprises operation amplifier module in described shell 7, described data pick-up induces CANH bus signals and CANL bus signals from described CANH bus 20 and CANL bus 21 respectively, transfer to described operation amplifier module, after amplifying, transfer to a CAN receiving terminal by the CAN data output interface 4 on described shell 7.
In described operation amplifier module, a CANH input is connected serially to the positive input of one first operational amplifier U2A by one second capacitor C 2, one the 4th resistance R 4; One CANL input is connected serially to the reverse input end of described the first operational amplifier U2A by one first capacitor C 1, one the 3rd resistance R 3; The reverse input end of described the first operational amplifier U2A is connected to the output of described the first operational amplifier U2A by one the 6th resistance R 6; The output of described the first operational amplifier U2A connects the reverse input end of one second operational amplifier U2B, and the positive input of described the second operational amplifier U2B is connected to the output of described the second operational amplifier U2B by one the 9th resistance R 9; The output of described the second operational amplifier U2B is connected to described CAN receiving terminal.
Node between described the first capacitor C 1 and the 3rd resistance R 3 is connected to the first power supply by one first resistance R 1.Node between described the second capacitor C 2 and the 4th resistance R 4 is connected to the first power supply by one second resistance R 2.Node between described the 4th resistance R 4 and the positive input of the first operational amplifier U2A is connected to the first power supply by one the 5th resistance R 5.Described the first power supply is 2.5V.
The positive input of described the second operational amplifier U2B is connected to second source by one the 7th resistance R 7.Described second source is 5V.The positive input of described the second operational amplifier U2B is by one the 8th resistance R 8 ground connection.
Described CAN data output interface 4 is arranged between the CANH bus via hole 1 and CANL bus via hole 2 of described shell 7 one end.
Use state of the present invention is as follows:
Shown in Fig. 3, the CAN bus on automobile comprises CANH bus 20 and CANL bus 21, and has connected respectively car running computer 11, recorder 13, speed changer 14 etc. vehicle electronics parts.The device of the CAN of reading bus data of the present invention 10 is installed in CANH bus 20 and CANL bus 21, and connects CAN receiving terminal 12.
As shown in Figure 1, CAN bus data fetch equipment of the present invention comprises a shell 7, be positioned at this shell 7 printed circuit board (PCB) 5 is set, be positioned at this shell upper end one direct current input interface and CAN data output interface 4 are set, be positioned at buckle assembly 6 and the connector 3 of this shell side, be positioned at CANH bus via hole 1 and the CANL bus via hole 2 of relative position on this shell.
When use, buckle assembly 6 is opened, and two lines of target CAN bus (CANH bus 20 and CANL bus 21) are placed on respectively in CANH bus via hole 1 and CANL bus via hole 2, then buckle assembly 6 is buckled, the data that CAN bus sends, sense the input of the operation amplifier modular circuit U2 on printed substrate 5 by data pick-up (not shown), through amplifying, then pass through CAN transceiver circuit U1, and to present device, power supply is connected with present device by CAN data output interface 4 with CAN receiving terminal 12 by CAN data output interface 4.Then just the data in CAN bus can have been read.
As shown in Figure 2, the signal CANL that CAN bus induces and CANH enter into respectively reverse input end and the positive input of amplifier U2A through capacitor C 1 resistance R 3 and capacitor C 2 resistance R 4, the reverse input end of amplifier U2A is connected with the output of amplifier U2A through resistance R 6, the positive input of amplifier U2A is connected with resistance R 5, the output of amplifier U2A is connected with the direction input of amplifier U2B, the positive input of amplifier U2B is connected with the output of amplifier U2B through resistance R 9, be connected with ground through resistance R 8, be connected with power supply through resistance R 7, the output of amplifier U2B is connected with the 1st pin TX of CAN transceiver U1, the 8th pin of CAN transceiver U1 is connected to the ground through resistance R 10, the 6th pin CANL of CAN transceiver U1 and the 7th pin CANH respectively by CAN data output interface 4(as Fig. 1) be connected with CAN receiving terminal.
CAN bus data fetch equipment of the present invention can carry out data to target vehicle-mounted CAN bus easily and read.This CAN bus data fetch equipment can also be applied on other equipment that need to use CAN bus.
In summary, compared with prior art, the device of the CAN of reading bus data of the present invention can carry out data to target vehicle-mounted CAN bus and read a kind of device that reads CAN bus data of the present invention easily.This CAN bus data fetch equipment can also be applied on other equipment that need to use CAN bus.The present invention has following advantage and good effect: it is more convenient to install and use, and is applicable to the CAN bus on all devices, comprises automobile but is not limited to automobile; 100% the data that accurately read CAN bus; 100% Noninvasive technology; The safe and reliable reading of CAN bus data, not welding, line cutting or crimping; On the data in CAN bus without any impact.
Above-described embodiment is only for illustrating technological thought of the present invention and feature, its object is to make those skilled in the art can understand content of the present invention and implement according to this, can not only limit the scope of the claims of the present invention with the present embodiment, be all equal variation or modifications of doing according to disclosed spirit, still drop in the scope of the claims of the present invention.
Claims (9)
1. a device that reads CAN bus data, is characterized in that, comprising:
Shell (7), the first side is provided with at least one connector (3), the second side is provided with some buckle assemblies (6), two parts of the hinged described shell of described connector (3) (7), and by described buckle assembly (6), described shell (7) is fastened in a CANH bus and a CANL bus;
The two ends of described shell (7) are respectively equipped with one group of CANH bus via hole (1) and one group of CANL bus via hole (2), and described CANH bus (20) and CANL bus (21) pass through respectively CANH bus via hole (1) and CANL bus via hole (2) passes described shell (7);
The printed circuit board (PCB) that is also provided with data pick-up and comprises operation amplifier module in described shell (7), described data pick-up induces CANH bus signals and CANL bus signals from described CANH bus (20) and CANL bus (21) respectively, transfer to described operation amplifier module, after amplifying, transfer to a CAN receiving terminal by the CAN data output interface (4) on described shell (7);
In described operation amplifier module, a CANH input is connected serially to the positive input of one first operational amplifier (U2A) by one second electric capacity (C2), one the 4th resistance (R4); One CANL input is connected serially to the reverse input end of described the first operational amplifier (U2A) by one first electric capacity (C1), one the 3rd resistance (R3); The reverse input end of described the first operational amplifier (U2A) is connected to the output of described the first operational amplifier (U2A) by one the 6th resistance (R6); The output of described the first operational amplifier (U2A) connects the reverse input end of one second operational amplifier (U2B), and the positive input of described the second operational amplifier (U2B) is connected to the output of described the second operational amplifier (U2B) by one the 9th resistance (R9); The output of described the second operational amplifier (U2B) is connected to described CAN receiving terminal.
2. the device that reads CAN bus data as claimed in claim 1, is characterized in that: the node between described the first electric capacity (C1) and the 3rd resistance (R3) is connected to the first power supply by one first resistance (R1).
3. the device that reads CAN bus data as claimed in claim 1, is characterized in that: the node between described the second electric capacity (C2) and the 4th resistance (R4) is connected to the first power supply by one second resistance (R2).
4. the device that reads CAN bus data as claimed in claim 1, is characterized in that: the node between described the 4th resistance (R4) and the positive input of the first operational amplifier (U2A) is connected to the first power supply by one the 5th resistance (R5).
5. the device that reads CAN bus data as described in any one in claim 2 to 4, is characterized in that: described the first power supply is 2.5V.
6. the device that reads CAN bus data as claimed in claim 1, is characterized in that: the positive input of described the second operational amplifier (U2B) is connected to second source by one the 7th resistance (R7).
7. the device that reads CAN bus data as claimed in claim 6, is characterized in that: described second source is 5V.
8. the device that reads CAN bus data as claimed in claim 1, is characterized in that: the positive input of described the second operational amplifier (U2B) is by one the 8th resistance (R8) ground connection.
9. the device that reads CAN bus data as claimed in claim 1, is characterized in that: described CAN data output interface (4) is arranged between the CANH bus via hole (1) and CANL bus via hole (2) of described shell (7) one end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410372550.6A CN104135267B (en) | 2014-07-31 | 2014-07-31 | A kind of device for reading CAN data |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410372550.6A CN104135267B (en) | 2014-07-31 | 2014-07-31 | A kind of device for reading CAN data |
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| Publication Number | Publication Date |
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| CN104135267A true CN104135267A (en) | 2014-11-05 |
| CN104135267B CN104135267B (en) | 2017-10-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410372550.6A Active CN104135267B (en) | 2014-07-31 | 2014-07-31 | A kind of device for reading CAN data |
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| CN101943901A (en) * | 2010-08-11 | 2011-01-12 | 西安电子科技大学 | Online data monitoring device of non-contact-type 485 bus |
| US20110199229A1 (en) * | 2005-05-24 | 2011-08-18 | Peter Rieth | Method and system for detecting the typ of tire |
| CN102882561A (en) * | 2012-07-24 | 2013-01-16 | 西安电子科技大学 | Non-contact data transmission device |
| DE102011079873A1 (en) * | 2011-07-27 | 2013-01-31 | Robert Bosch Gmbh | Measurement insert for reading data of e.g. electric appliances, from controller area network interface in motor car, has conversion device for converting electrical data received from control device into radio signals |
| CN204013476U (en) * | 2014-07-31 | 2014-12-10 | 上海移为通信技术有限公司 | A kind of device that reads CAN bus data |
-
2014
- 2014-07-31 CN CN201410372550.6A patent/CN104135267B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006067465A (en) * | 2004-08-30 | 2006-03-09 | Jatco Ltd | Analog-to-digital signal converter, and network line and data collector equipped with analog-to-digital signal converter |
| CN2790483Y (en) * | 2004-12-29 | 2006-06-28 | 黄蓉生 | Transfusion alarm |
| US20110199229A1 (en) * | 2005-05-24 | 2011-08-18 | Peter Rieth | Method and system for detecting the typ of tire |
| CN101943901A (en) * | 2010-08-11 | 2011-01-12 | 西安电子科技大学 | Online data monitoring device of non-contact-type 485 bus |
| DE102011079873A1 (en) * | 2011-07-27 | 2013-01-31 | Robert Bosch Gmbh | Measurement insert for reading data of e.g. electric appliances, from controller area network interface in motor car, has conversion device for converting electrical data received from control device into radio signals |
| CN102882561A (en) * | 2012-07-24 | 2013-01-16 | 西安电子科技大学 | Non-contact data transmission device |
| CN204013476U (en) * | 2014-07-31 | 2014-12-10 | 上海移为通信技术有限公司 | A kind of device that reads CAN bus data |
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| Publication number | Publication date |
|---|---|
| CN104135267B (en) | 2017-10-13 |
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