CN113176743B - CAN network physical layer diagnosis resistance self-adaptive circuit and method - Google Patents
CAN network physical layer diagnosis resistance self-adaptive circuit and method Download PDFInfo
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- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
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- G—PHYSICS
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
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Abstract
The invention discloses a CAN network physical layer diagnosis resistance self-adaptive circuit and a CAN network physical layer diagnosis resistance self-adaptive method, and relates to the technical field of CAN communication. The device comprises a resistance detection circuit, an automatic resistance matching circuit and a voltage detection circuit, wherein the input ends of the resistance detection circuit, the automatic resistance matching circuit and the voltage detection circuit are connected with a CAN network, and the output ends of the resistance detection circuit, the automatic resistance matching circuit and the voltage detection circuit are connected with an MCU; the MCU controls the resistance detection circuit to detect the matching resistance, judges whether the matching resistance meets the system requirement or not, and sends a matching resistance self-adaptive instruction to the MCU if the matching resistance does not meet the standard; after receiving the adaptive instruction of the matched resistor, the MCU executes adaptive operation according to the type of the instruction; and the CAN signal voltage detection mode is used for detecting signal voltage, and the MCU judges whether the acquired signal meets the standard voltage or not and whether interference pulse exists or not. The problem of current CAN diagnostic equipment function singleness is solved.
Description
Technical Field
The invention relates to the technical field of CAN communication, in particular to a CAN network physical layer diagnosis resistance self-adaptive circuit and a CAN network physical layer diagnosis resistance self-adaptive method.
Background
CAN is a short term for controller area network (controller area network), developed by BOSCH corporation, germany, which is known to develop and produce automotive electronics, and finally becomes the international standard (ISO 11898), which is one of the most widely used field buses internationally. In north america and western europe, the CAN bus protocol has become the standard bus for automotive computer control systems and embedded industrial control area networks, and has the J1939 protocol designed specifically for large trucks and heavy work machine vehicles with CAN as the underlying protocol. In recent years, the automobile industry is rapidly developed, the CAN communication is taken as the main communication in the automobile industry, and vehicle-mounted CAN communication equipment is also in the endlessly. In order to better monitor the vehicle-mounted CAN network, CAN diagnostic equipment on the market is more abundant. At present, CAN bus diagnostic equipment on the market mainly comprises OBD interface pin identification, CAN bus baud rate self-adaption, bus voltage identification, parallel CAN module automatic resistance matching and additional signal CAN resistance matching. However, the existing CAN diagnostic devices in the market generally have a single function, only have bus data analysis, or only have an automatic matching bus resistor with a detection port line, or manually add a matching resistor to a CAN interface or manually dial the device through a dial switch, usually manually measure the matching resistor of the CAN network and then perform matching, cannot automatically measure the terminal resistance of the CAN network and then perform matching, do not have the function of analyzing the signal voltage of the CAN network, and cannot judge whether the CAN network has interference pulses.
Disclosure of Invention
The invention aims to provide a CAN network physical layer diagnosis resistance self-adaptive circuit and a method, which have the functions of automatically measuring the matching resistance of a CAN network and then automatically matching the resistance, analyzing the signal voltage of the CAN network and judging whether interference pulses exist or not, and solve the problem of single function of the conventional CAN diagnosis instrument.
The technical scheme adopted by the invention is as follows:
a CAN network physical layer diagnosis resistance self-adaptive circuit is used for executing a resistance self-adaptive method and comprises a resistance detection circuit, a resistance automatic matching circuit and a voltage detection circuit, wherein the input ends of the resistance detection circuit, the resistance automatic matching circuit and the voltage detection circuit are connected with a CAN network, the output ends of the resistance detection circuit, the resistance automatic matching circuit and the voltage detection circuit are connected with an MCU (microprogrammed control unit), and the MCU controls the resistance detection circuit to detect matched resistance; judging whether the matching resistance meets the system requirement, and if the matching resistance does not meet the standard, sending a matching resistance self-adaption instruction to the MCU; after receiving the adaptive instruction of the matched resistor, the MCU executes adaptive operation according to the type of the instruction, then carries out a CAN signal voltage detection mode, and judges whether the acquired signal meets the standard voltage or not and whether interference pulse exists or not.
Further, the resistance detection circuit comprises an operational amplifier circuit, an MCU circuit, a resistor R11, diodes D1 and D2, and when the CAN matching resistance detection circuit is connected to a CAN network, the voltage value of the test point 1 is V1; the CAN _ H is connected with the diode D1 and the resistor R11 in series to VCC, the CAN _ L is connected with the diode D2 in series to the ground, the test point 1 is connected with the input end of the operational amplifier, and the output end of the operational amplifier is connected with the AD acquisition end of the MCU circuit.
Further, the automatic resistance matching circuit comprises control switches K3 and K4 and resistors R4 and R5, and when the CAN matching resistance detection circuit is connected to a CAN network; CAN _ H is connected with one end of control switches K3 and K4 in series, and CAN _ L is connected with one end of resistors R4 and R5 in series; the other ends of the control switches K3 and K4 are connected in series with the other ends of the resistors R4 and R5.
Further, the voltage detection circuit comprises a control switch K5 and a control switch K6, one end of the control switch K5 is connected with CAN _ H, one end of the control switch K6 is connected with CAN _ L and connected to a CAN bus network, the other end of the control switch K6 is connected with one end of a resistor R7, one end of the resistor R7 is connected with the non-inverting input end of the operational amplifier U1A, the non-inverting input end of the operational amplifier U1A is simultaneously connected with one end of a resistor R9, the other end of the resistor R9 is connected with ground, the inverting input end 2 of the operational amplifier U1A is connected with the output end 1 of the operational amplifier, the output end 1 of the operational amplifier is connected with one end of a resistor R12, the other end of the resistor R12 is connected with an AD acquisition end AI-ADC1 of the MCU circuit, the AD acquisition end AI-ADC1 is connected in parallel with a capacitor C4, and the other end of the capacitor C4 is connected to ground; the other end of control switch K5 is connected with resistance R6's one end, resistance R6's one end is connected with the homophase input end of the U1B that fortune was put, the homophase input end of the U1B that fortune was put is connected with resistance R8's one end simultaneously, resistance R8's the other end is connected with ground, the U1B's inverting input end 6 that fortune was put is connected with the output 7 that fortune was put, the output 7 that fortune was put is connected with resistance R10's one end, resistance R10's the other end is connected with the AD collection end AI-ADC2 of MCU circuit, AD collection end AI-ADC2 parallels electric capacity C3, and the electric capacity C3 other end is connected to ground.
Furthermore, the number of the CAN network node modules is one or N, and the maximum value of N meets the maximum value in a standard protocol.
Further, the standard is J1939 standard protocol.
A CAN network physical layer diagnosis resistance self-adapting method specifically comprises the following steps:
s1, the MCU controls the CAN resistance detection circuit to detect the matched resistance;
s2, judging whether the matching resistance meets the system requirement, if so, entering S4, and if not, sending a matching resistance self-adaptive instruction to the MCU and entering S3;
s3, after receiving the adaptive instruction of the matched resistor, the MCU executes adaptive operation according to the type of the instruction and enters S4;
and S4, carrying out a CAN signal voltage detection mode, and then judging whether the acquired signal conforms to the standard voltage of J1939 standard CAN communication or not and whether interference pulse exists or not by the MCU.
The invention has the beneficial effects that:
1. the invention relates to a CAN network physical layer diagnosis resistance self-adaptive circuit and a method, which CAN detect various CAN network signal voltage states and judge whether a CAN network has faults or not, automatically identify the matching resistance condition of the accessed CAN network by switching the CAN network to a pull-up resistance test CAN matching resistance which is connected in series, automatically configure the matching resistance of the CAN network, have rich functions, have stronger universality and practicability, greatly reduce the diagnosis difficulty of CAN equipment and improve the diagnosis efficiency.
2. The invention relates to a CAN network physical layer diagnosis resistance self-adaptive circuit and a method, which have simple circuit and rich functions, and all the functions CAN be switched at will. The problem of single function of the prior CAN diagnostic instrument is solved.
Drawings
FIG. 1 is a general block diagram of a CAN network physical layer diagnostic resistance adaptive circuit of the present invention;
FIG. 2 is a schematic flow chart of a CAN network physical layer diagnostic resistance adaptive method of the present invention;
FIG. 3 is a schematic diagram of a CAN network matching resistance detection circuit of the present invention;
FIG. 4 is a schematic diagram of the matched resistance detection process of the present invention;
FIG. 5 is a schematic diagram of the matched resistance adaptive circuit of the present invention;
FIG. 6 is a flow chart of the matched resistance adaptation of the present invention;
FIG. 7 is a schematic diagram of a signal voltage detection circuit according to the present invention;
fig. 8 is a signal voltage detection flow chart of the present invention.
Detailed Description
All of the features disclosed in this specification, or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations of features and/or steps that are mutually exclusive.
It is noted that relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
A CAN network physical layer diagnosis resistance self-adaptive circuit shown in figure 1 is used for executing a resistance self-adaptive method, and comprises a resistance detection circuit, a resistance automatic matching circuit and a voltage detection circuit, wherein the input ends of the resistance detection circuit, the resistance automatic matching circuit and the voltage detection circuit are connected with a CAN network, and the output ends of the resistance detection circuit, the resistance automatic matching circuit and the voltage detection circuit are connected with an MCU. The automatic identification of the CAN network terminal resistor is realized through the resistor detection circuit, the automatic identification result is fed back to the MCU through the output end, the MCU collects the automatic identification result, and the automatic addition of a proper matching resistor is realized through the resistor automatic matching circuit according to the identification result; meanwhile, the voltage detection circuit monitors the signal voltage of the CAN network, interferes with pulse, and feeds monitoring data back to the MCU through the output end, and the MCU receives the voltage monitoring data to judge whether the connection of each device of the CAN network is normal or not and whether the signal is normal or not. In the CAN network physical layer diagnosis resistance self-adaptive circuit, the number of the whole CAN network node modules CAN be 1 to N, wherein the maximum value of N meets the maximum value in a J1939 standard protocol; r1 and R2 are matching resistors accessed between the CAN network CAN _ H and the CAN _ L.
The resistance detection circuit shown in fig. 3 includes an operational amplifier circuit, an MCU circuit, a resistor R11, and diodes D1 and D2, and when the CAN matching resistance detection circuit is connected to the CAN network, the voltage value of the test point 1 is V1; CAN _ H concatenates resistance R11 and diode D1 to VCC, CAN _ L concatenates diode D2 to ground, and test point 1 inserts the input of fortune is put, and the output of fortune is put and is connected with the AD acquisition end of MCU circuit, gathers the voltage value data of test point 1, and when having different matched resistance in the CAN network, the voltage value of test point 1 is different. When the resistance value of a matching resistor accessed by the system is 60 omega, collecting a voltage value V1 of a test point 1 corresponding to a voltage value 1; when the resistance value of a matching resistor of the system is 120 ohms, collecting a voltage value V1 of a test point 1 corresponding to a voltage value 2; when the system is short-circuited, collecting a voltage value V1 of a test point 1 corresponding to a voltage value 3; when no matching resistor is accessed in the system, the voltage value 4 corresponding to the test point 1 is collected. And outputting the detected voltage data to an AD acquisition end of the MCU circuit through the operational amplifier.
TABLE 1 Voltage reference values for different numbers of matched resistors
| |
Terminal resistance access condition | |
| Value | ||
| 1 | 60Ω | 1.3V～1.6 |
| Value | ||
| 2 | 120Ω | 2.0V～2.4 |
| Value | ||
| 3 | Short-circuiting | 1V or less |
| Value 4 | Open circuit | 2.7V or more |
And as for the reference values in the table above, the MCU judges according to the voltage range of the standard value of the matching resistor of J1939, judges the access condition of the matching resistor according to the range of the voltage value, and further judges whether the matching resistor meets the standard or not and whether automatic resistor matching is needed or not.
The schematic diagram of the automatic resistor matching circuit shown in fig. 5 includes a self-adaptive resistor and a corresponding control switch, one end of a resistor R5 is connected to CAN _ L, the other end is connected to a control switch K3, the other end of the control switch K3 is connected to CAN _ H, one end of a resistor R4 is connected to CAN _ L, the other end is connected to a control switch K4, and the other end of the control switch K4 is connected to CAN _ H. When the MCU judges that resistance matching needs to be carried out on the CAN network, a corresponding self-adaptive instruction is given, self-adaptive operation is carried out according to the type of the instruction, when one matching resistor is added to the CAN network, one of the K3 and the K4 is closed, if two matching resistors are added to the CAN network, the K3 and the K4 are closed at the same time. And completing the adaptive matching of the resistance.
The voltage detection circuit shown in fig. 7 includes a control switch K5 and a control switch K6, one end of the control switch K5 is connected to CAN _ H, one end of the control switch K6 is connected to CAN _ L, and is connected to a CAN bus network, the other end of the control switch K6 is connected to one end of a resistor R7, one end of the resistor R7 is connected to a non-inverting input terminal of a U1A of an operational amplifier, the non-inverting input terminal of the U1A of the operational amplifier is simultaneously connected to one end of a resistor R9, the other end of the resistor R9 is connected to ground, an inverting input terminal 2 of the U1A of the operational amplifier is connected to an output terminal 1 of the operational amplifier, the output terminal 1 of the operational amplifier is connected to one end of a resistor R12, the other end of the resistor R12 is connected to an AD acquisition terminal AI-ADC1 of an MCU circuit, the AD acquisition terminal AI-ADC1 is connected in parallel with a capacitor C4, and the other end of the capacitor C4 is connected to ground; the other end of control switch K5 is connected with resistance R6's one end, resistance R6's one end is connected with the homophase input end of the U1B that fortune was put, the homophase input end of the U1B that fortune was put is connected with resistance R8's one end simultaneously, resistance R8's the other end is connected with ground, the inverting input end 6 of the U1B that fortune was put is connected with the output 7 that fortune was put, the output 7 that fortune was put is connected with resistance R10's one end, resistance R10's the other end is connected with AD acquisition end AI-ADC2 of MCU circuit, AD acquisition end AI-ADC2 parallels electric capacity C3, and the electric capacity C3 other end is connected to ground. When the MCU sends an instruction to enter a CAN signal voltage detection mode, the control switch K5 is switched on, the CAN network signal voltage detection is carried out, the operational amplifier collects the signal voltage of the CAN network and transmits the signal voltage to the MCU for analysis, then the MCU judges whether the collected signal accords with the standard voltage of the CAN communication of the J1939 standard or not, whether interference pulses exist or not, and the MCU judges whether abnormal pulses exist in the state of the CAN network signal connection equipment and the signal voltage or not according to the collected signal voltage.
Example 6
A CAN network physical layer diagnostic resistance adaptation method as shown in figure 2,
the MCU controls the CAN network resistance detection circuit to detect the matching resistance;
as shown in the matching resistance detection process of fig. 4, it is determined whether the matching resistance meets the system requirements, if the matching resistance meets the standard protocol, S4 is performed, and if the matching resistance does not meet the standard, a matching resistance adaptive instruction is sent to the MCU and the process enters the matching resistance adaptive process;
as shown in the adaptive flow of the matched resistor of fig. 6, after receiving the adaptive command of the matched resistor, the MCU executes the adaptive operation according to the type of the command, and then performs the signal voltage detection flow;
as shown in the signal voltage detection process of fig. 8, after entering the CAN signal voltage detection mode, the MCU determines whether the acquired signal meets the J1939 standard voltage, then determines whether there is an interference pulse, and finally ends the process.
The above description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be made by those skilled in the art without inventive work within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope defined by the claims.
Claims (6)
1. A CAN network physical layer diagnostic resistance adaptation circuit for performing a method of resistance adaptation, characterized by: the circuit comprises a resistance detection circuit, a resistance automatic matching circuit and a voltage detection circuit, wherein the input ends of the resistance detection circuit, the resistance automatic matching circuit and the voltage detection circuit are connected with a CAN network, and the output ends of the resistance detection circuit, the resistance automatic matching circuit and the voltage detection circuit are connected with an MCU;
the resistance self-adaption method specifically comprises the following steps:
s1, the MCU controls the CAN resistance detection circuit to detect the matched resistance;
s2, judging whether the matching resistance meets the standard or not, if so, entering S4, and if not, sending a matching resistance self-adaptive instruction to the MCU and entering S3;
s3, after receiving the adaptive instruction of the matched resistor, the MCU executes adaptive operation according to the type of the instruction and enters S4;
and S4, a CAN signal voltage detection mode is carried out, and then the MCU judges whether the acquired signal conforms to the standard voltage of J1939 standard CAN communication or not and whether interference pulses exist or not.
2. The CAN network physical layer diagnostic resistance adaptation circuit of claim 1, wherein: the resistance detection circuit comprises an operational amplifier circuit, an MCU circuit, a resistor R11, diodes D1 and D2, and when the CAN matching resistance detection circuit is connected to a CAN network; the CAN _ H is connected with the resistor R11 and the diodes D1 to VCC in series, the CAN _ L is connected with the diodes D2 to the ground in series, the test point 1 is connected into the input end of the operational amplifier circuit, and the output end of the operational amplifier circuit is connected with the AD acquisition end of the MCU circuit.
3. The CAN network physical layer diagnostic resistance adaptation circuit of claim 1, wherein: the automatic resistance matching circuit comprises control switches K3 and K4 and resistors R4 and R5, and when the CAN resistance automatic matching circuit is connected to a CAN network; the CAN _ H port is connected with one end of the control switches K3 and K4 in series, and the CAN _ L port is connected with one end of the resistors R4 and R5 in series; the other ends of the control switches K3 and K4 are connected in series with the other ends of the resistors R4 and R5.
4. The CAN network physical layer diagnostic resistance adaptation circuit of claim 1, wherein: the voltage detection circuit comprises a control switch K5 and a control switch K6, one end of the control switch K5 is connected with CAN _ H, one end of the control switch K6 is connected with CAN _ L and is connected with a CAN bus network, the other end of the control switch K6 is connected with one end of a resistor R7, the other end of the resistor R7 is connected with the non-inverting input end of the U1A of the operational amplifier, the non-inverting input end of the U1A of the operational amplifier is simultaneously connected with one end of a resistor R9, the other end of the resistor R9 is connected with the ground, the inverting input end 2 of the U1A of the operational amplifier is connected with the output end 1 of the operational amplifier, the output end 1 of the operational amplifier is connected with one end of a resistor R12, the other end of the resistor R12 is connected with an AD acquisition end AI-ADC1 of the MCU circuit, the AD acquisition end AI-ADC1 is connected with a capacitor C4 in parallel, and the other end of the capacitor C4 is connected to the ground; the other end of control switch K5 is connected with resistance R6's one end, resistance R6's the other end is connected with the homophase input end of the U1B that fortune was put, the homophase input end of the U1B that fortune was put is connected with resistance R8's one end simultaneously, resistance R8's the other end is connected with ground, the inverting input end 6 of the U1B that fortune was put is connected with the output 7 that fortune was put, the output 7 that fortune was put is connected with resistance R10's one end, resistance R10's the other end is connected with AD collection end AI-ADC2 of MCU circuit, AD collection end AI-ADC2 parallels electric capacity C3, and the electric capacity C3 other end is connected to ground.
5. The CAN network physical layer diagnostic resistance adaptation circuit of claim 1, wherein: the number of the CAN network node modules in the self-adaptive circuit is one or N, and the maximum value of N meets the maximum value in a standard protocol.
6. The CAN network physical layer diagnostic resistance adaptive circuit according to claim 5, wherein: the standard protocol is J1939 standard protocol.
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Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2101336A1 (en) * | 1991-01-30 | 1992-07-31 | Moshe Gray | Interactive diagnostic system for an automotive vehicle, and method |
| JPH09192132A (en) * | 1996-01-23 | 1997-07-29 | Hitachi Medical Corp | Ultrasonic reception circuit |
| CA2579675A1 (en) * | 2004-09-10 | 2006-03-23 | Cooper Technologies Company | System and method for circuit protector monitoring and management |
| CN201638076U (en) * | 2010-03-18 | 2010-11-17 | 奇瑞汽车股份有限公司 | Vehicle-mounted diagnosis device based on CAN (Content Addressable Network) bus |
| CN101947938A (en) * | 2010-09-26 | 2011-01-19 | 重庆长安汽车股份有限公司 | Hybrid power CAN network communication system |
| CN202159271U (en) * | 2011-08-16 | 2012-03-07 | 北京阿尔泰科技发展有限公司 | Device capable of automatically selecting CAN bus terminating resistor |
| CN102393731A (en) * | 2011-10-17 | 2012-03-28 | 苏州凌创电子科技有限公司 | On-board monitoring and diagnosis device based on OBD-II (On-Board Diagnostics-II) |
| CN202617152U (en) * | 2012-05-09 | 2012-12-19 | 北汽福田汽车股份有限公司 | Vehicle-mounted local area network (LAN) system and automobile with same |
| CN103067241A (en) * | 2013-01-15 | 2013-04-24 | 中联重科股份有限公司 | CAN bus signal transmission device and test system |
| CN103248529A (en) * | 2012-02-10 | 2013-08-14 | 珠海格力电器股份有限公司 | Control circuit of communication network matching resistor |
| CN103454947A (en) * | 2013-08-28 | 2013-12-18 | 深圳市元征科技股份有限公司 | Vehicle diagnosis code-reading device |
| CN104298224A (en) * | 2014-09-12 | 2015-01-21 | 中国第一汽车股份有限公司 | Automatic vehicle-mounted electronic control unit CAN bus communication testing device and system |
| JP2015133554A (en) * | 2014-01-10 | 2015-07-23 | 三菱電機株式会社 | Wired transmission device and method of adjusting resistance of termination resistor |
| CN105278411A (en) * | 2015-10-28 | 2016-01-27 | 新誉轨道交通科技有限公司 | High-speed CAN bus self-adaptive impedance matching module, method and system |
| WO2017005361A1 (en) * | 2015-07-09 | 2017-01-12 | Continental Automotive France | Transmitter-receiver device connectable to a communications network by a can-type or flexray-type bus |
| CN107959608A (en) * | 2017-12-06 | 2018-04-24 | 珠海格力电器股份有限公司 | CAN bus terminal resistance matching method and device |
| CN108205308A (en) * | 2017-12-19 | 2018-06-26 | 中国第汽车股份有限公司 | A kind of automated diagnostic tester system based on vehicle body domain controller |
| CN207965560U (en) * | 2018-01-30 | 2018-10-12 | 北京智行鸿远汽车有限公司 | A kind of circuit detected automatically suitable for CAN bus terminal resistance |
| CN109739789A (en) * | 2018-12-06 | 2019-05-10 | 西安翔迅科技有限责任公司 | A kind of terminal resistor automatic match circuit and method |
| JP2019096152A (en) * | 2017-11-24 | 2019-06-20 | 東芝産業機器システム株式会社 | Diagnostic program and diagnostic device |
| CN209860931U (en) * | 2019-05-21 | 2019-12-27 | 天津卡达克数据有限公司 | Intelligent CAN bus diagnosis monitor |
| CN209987874U (en) * | 2019-04-26 | 2020-01-24 | 广州亚美智造科技有限公司 | Device for dynamically adjusting hidden level of automobile CAN bus |
| CN112859808A (en) * | 2021-01-11 | 2021-05-28 | 上海星融汽车科技有限公司 | CAN bus terminal resistor adaptation method, system and diagnosis equipment |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7082357B2 (en) * | 2003-01-31 | 2006-07-25 | Advics Co., Ltd. | Failure diagnosis method of vehicle communication network |
| US20080123771A1 (en) * | 2006-11-08 | 2008-05-29 | International Business Machines Corporation | Systems and Arrangements for Controlling an Impedance on a Transmission Path |
-
2021
- 2021-03-25 CN CN202110324337.8A patent/CN113176743B/en active Active
Patent Citations (23)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2101336A1 (en) * | 1991-01-30 | 1992-07-31 | Moshe Gray | Interactive diagnostic system for an automotive vehicle, and method |
| JPH09192132A (en) * | 1996-01-23 | 1997-07-29 | Hitachi Medical Corp | Ultrasonic reception circuit |
| CA2579675A1 (en) * | 2004-09-10 | 2006-03-23 | Cooper Technologies Company | System and method for circuit protector monitoring and management |
| CN201638076U (en) * | 2010-03-18 | 2010-11-17 | 奇瑞汽车股份有限公司 | Vehicle-mounted diagnosis device based on CAN (Content Addressable Network) bus |
| CN101947938A (en) * | 2010-09-26 | 2011-01-19 | 重庆长安汽车股份有限公司 | Hybrid power CAN network communication system |
| CN202159271U (en) * | 2011-08-16 | 2012-03-07 | 北京阿尔泰科技发展有限公司 | Device capable of automatically selecting CAN bus terminating resistor |
| CN102393731A (en) * | 2011-10-17 | 2012-03-28 | 苏州凌创电子科技有限公司 | On-board monitoring and diagnosis device based on OBD-II (On-Board Diagnostics-II) |
| CN103248529A (en) * | 2012-02-10 | 2013-08-14 | 珠海格力电器股份有限公司 | Control circuit of communication network matching resistor |
| CN202617152U (en) * | 2012-05-09 | 2012-12-19 | 北汽福田汽车股份有限公司 | Vehicle-mounted local area network (LAN) system and automobile with same |
| CN103067241A (en) * | 2013-01-15 | 2013-04-24 | 中联重科股份有限公司 | CAN bus signal transmission device and test system |
| CN103454947A (en) * | 2013-08-28 | 2013-12-18 | 深圳市元征科技股份有限公司 | Vehicle diagnosis code-reading device |
| JP2015133554A (en) * | 2014-01-10 | 2015-07-23 | 三菱電機株式会社 | Wired transmission device and method of adjusting resistance of termination resistor |
| CN104298224A (en) * | 2014-09-12 | 2015-01-21 | 中国第一汽车股份有限公司 | Automatic vehicle-mounted electronic control unit CAN bus communication testing device and system |
| WO2017005361A1 (en) * | 2015-07-09 | 2017-01-12 | Continental Automotive France | Transmitter-receiver device connectable to a communications network by a can-type or flexray-type bus |
| CN105278411A (en) * | 2015-10-28 | 2016-01-27 | 新誉轨道交通科技有限公司 | High-speed CAN bus self-adaptive impedance matching module, method and system |
| JP2019096152A (en) * | 2017-11-24 | 2019-06-20 | 東芝産業機器システム株式会社 | Diagnostic program and diagnostic device |
| CN107959608A (en) * | 2017-12-06 | 2018-04-24 | 珠海格力电器股份有限公司 | CAN bus terminal resistance matching method and device |
| CN108205308A (en) * | 2017-12-19 | 2018-06-26 | 中国第汽车股份有限公司 | A kind of automated diagnostic tester system based on vehicle body domain controller |
| CN207965560U (en) * | 2018-01-30 | 2018-10-12 | 北京智行鸿远汽车有限公司 | A kind of circuit detected automatically suitable for CAN bus terminal resistance |
| CN109739789A (en) * | 2018-12-06 | 2019-05-10 | 西安翔迅科技有限责任公司 | A kind of terminal resistor automatic match circuit and method |
| CN209987874U (en) * | 2019-04-26 | 2020-01-24 | 广州亚美智造科技有限公司 | Device for dynamically adjusting hidden level of automobile CAN bus |
| CN209860931U (en) * | 2019-05-21 | 2019-12-27 | 天津卡达克数据有限公司 | Intelligent CAN bus diagnosis monitor |
| CN112859808A (en) * | 2021-01-11 | 2021-05-28 | 上海星融汽车科技有限公司 | CAN bus terminal resistor adaptation method, system and diagnosis equipment |
Non-Patent Citations (4)
| Title |
|---|
| CAN总线测试与仿真平台的系统设计;熊贤超;《中国优秀硕士学位论文全文数据库工程科技II辑》;20161115(第11期);全文 * |
| CAN通信终端电阻匹配试验研究;管昊;《舰船电子工程》;20190620;第39卷(第6期);全文 * |
| Characteristics of Single- and Multiple-Frequency Impedance Matching Networks;S. C. Dutta Roy;《IEEE Transactions on Circuits and Systems II: Express Briefs》;20141110;第62卷(第3期);全文 * |
| 奥迪A4-B6轿车CAN总线系统及检测维修;李贤彬;《汽车技术》;20050424(第4期);全文 * |
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