CN105278411A - High-speed CAN bus self-adaptive impedance matching module, method and system - Google Patents
High-speed CAN bus self-adaptive impedance matching module, method and system Download PDFInfo
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- CN105278411A CN105278411A CN201510712487.0A CN201510712487A CN105278411A CN 105278411 A CN105278411 A CN 105278411A CN 201510712487 A CN201510712487 A CN 201510712487A CN 105278411 A CN105278411 A CN 105278411A
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- 230000005540 biological transmission Effects 0.000 abstract description 5
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- 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
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0428—Safety, monitoring
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/25—Pc structure of the system
- G05B2219/25032—CAN, canbus, controller area network bus
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Abstract
The invention relates to a high-speed CAN bus self-adaptive impedance matching module, method and system. According to the voltage difference between signal lines of the corresponding end of a CAN bus, the self-adaptive impedance matching module adjusts the terminal resistance value of the end in a self-adaptive manner. According to the invention, the self-adaptive impedance matching module and method adjust the terminal resistance in a self-adaptive manner to realize matching according to the dominant position voltage change of the terminal of the CAN bus in the case of changed ambient temperature, bus length and the like; the transmission reliability of the high-speed CAN bus is improved to a certain extent; and the failure rate is reduced.
Description
Technical field
The present invention relates to signal transacting field, particularly relate to a kind of high-speed CAN bus Adaptive impedance matching module, method and system.
Background technology
Using 120 Ω fixed resistance values or the fixed resistance value through calculating to the terminal resistance configuration of high-speed CAN bus more at present, meeting the application of most of occasion.But the coupling of terminal resistance also receives the impact of other factors, as: use the impedance of different bus cable also different; Environmental change will cause the impedance, capacitive reactance characteristic variations etc. of bus transfer.When reality uses, there is following several situation:
1, use the characteristic parameter such as impedance, capacitive reactance of different telecommunication cables different;
Change the node in bus length or additions and deletions CAN when 2, using as required, cause the characteristic parameter in CAN to change;
3, environmental factor (as temperature) larger change causes CAN characteristic parameter to change.
Add the impacts such as electromagnetic interference (EMI), these complex situations random combines can cause the reliability of originally reliable or reliable high-speed CAN bus transmission to reduce, and even occur erroneous frame.Adopt the impedance matching of more difficult some special occasions of adaptation of terminal resistance of fixed resistance value, be generally at problem generation " Invest, Then Investigate " and process.
Summary of the invention
The object of this invention is to provide a kind of CAN Adaptive impedance matching module, method and system, solve the terminal voltage difference change caused due to the change of CAN characteristic parameter, and then the technical matters that the reliability causing CAN to transmit reduces.
In order to solve the problems of the technologies described above, the invention provides a kind of CAN Adaptive impedance matching module, the voltage difference between described Adaptive impedance matching module is suitable for according to the signal wire of CAN respective end, with the termination resistance value of this end of Automatic adjusument.
Further, described Adaptive impedance matching module comprises: voltage detecting circuit, single-chip microcomputer and digital regulation resistance, wherein said voltage detecting circuit for detect CAN respective end signal wire between voltage difference; Described single-chip microcomputer is connected with voltage detecting circuit, and by the output resistance of voltage difference control figure potentiometer as the termination resistance value matched with voltage difference.
Further, when described voltage detecting circuit detection voltage difference is between 1.5V-2.5V, the output resistance of described digital regulation resistance is 120 Ω; When described voltage detecting circuit detection voltage difference is greater than 0.5V and is less than 1.5V, the increase output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference is increased between 1.5V-2.5V; When described voltage detecting circuit detection voltage difference is greater than 2.5V, the reduction output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference drops between 1.5V-2.5V.
Further, the adjustment step value of described output resistance is 10 Ω.
Further, the storage unit in described single-chip microcomputer be also suitable for preserve voltage difference between 1.5V-2.5V time termination resistance value.
Further, in order to solve same technical matters, present invention also offers a kind of CAN Adaptive impedance matching method, the method comprises the steps:
Step S1, when CAN is dominant position, detects the voltage difference between the signal wire of CAN two ends respectively;
Step S2, according to the voltage difference of respective end, regulates the termination resistance value of this end.
Further, described termination resistance value realizes regulating by Adaptive impedance matching module, namely described Adaptive impedance matching module comprises: voltage detecting circuit, single-chip microcomputer and digital regulation resistance, wherein said voltage detecting circuit for detect CAN respective end signal wire between voltage difference; Described single-chip microcomputer is connected with voltage detecting circuit, and by the output resistance of voltage difference control figure potentiometer as the termination resistance value matched with voltage difference.
Further, according to the voltage difference of respective end in described step S2, the method for the termination resistance value of this end is regulated to comprise: when described voltage detecting circuit detection voltage difference is between 1.5V-2.5V, the output resistance of described digital regulation resistance is 120 Ω; When described voltage detecting circuit detection voltage difference is greater than 0.5V and is less than 1.5V, the increase output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference is increased between 1.5V-2.5V; When described voltage detecting circuit detection voltage difference is greater than 2.5V, the reduction output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference drops between 1.5V-2.5V.
Further, the adjustment step value of described output resistance is 10 Ω.
Further, the storage unit in described single-chip microcomputer be also suitable for preserve voltage difference between 1.5V-2.5V time termination resistance value.
The third aspect, present invention also offers a kind of Adaptive impedance matching system for CAN.
Described Adaptive impedance matching system comprises: the Adaptive impedance matching module described at least two, and two Adaptive impedance matching modules are installed in two terminals of CAN respectively.
The invention has the beneficial effects as follows, Adaptive impedance matching module of the present invention, method and system are suitable for when environment temperature, bus length etc. change, can according to the change of the dominant position voltage of CAN terminal, achieve Automatic adjusument terminal resistance and realize coupling, the reliability of high-speed CAN bus transmission can be improved to a certain extent, reduce rate of breakdown.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the present invention is further described.
Fig. 1 is the theory diagram of Adaptive impedance matching module of the present invention;
Fig. 2 is the algorithm flow chart of Adaptive impedance matching of the present invention;
Fig. 3 is voltage difference and terminal resistance Automatic adjusument curve map.
Embodiment
In conjunction with the accompanying drawings, the present invention is further detailed explanation.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present invention are described in a schematic way, and therefore it only shows the formation relevant with the present invention.
The present invention is high-speed CAN bus Adaptive impedance matching module and method, achieve when factors vary such as CAN environment, automatic maintenance CAN voltage is in range of normal value, namely when CAN impedance operator coupling is abnormal, automatic adjustment termination resistance value re-starts impedance matching, reach the object of best transmission reliability, strengthen the reliability of communication.
Suppose that two termination resistance value are equal, be R
t, the voltage difference between CANH and the CANL in CAN is U
0, the internal resistance in CAN is r, the voltage difference at Adaptive impedance matching module place
visible, the internal resistance in CAN is r and termination resistance value R
tall to the voltage U of Adaptive impedance matching module
thave impact, the change of internal resistance r may cause, in these cases, by revising termination resistance value R due to reasons such as the line resistance of the change of temperature, different cables is different, the changes of CAN length
t, the voltage U of Adaptive impedance matching module can be realized
tdeviation in rational scope.Road vehicles-numerical information exchange-high-speed communication controller local area network standard (ISO11898) that ISO formulates defines the scope of CAN level, the voltage difference scope wherein defining stealthy position is-0.5v ~ 0.05v, and the voltage difference of dominant position is 1.5v ~ 3.0v.When reality uses, the voltage difference in CAN generally needs to be greater than 0.9v guarantee and is identified as dominant level, and be less than 0.5v guarantee and be identified as stealthy level, 0.5 ~ 0.9v is uncertain region.
When dominant position, the voltage difference in CAN is generally at about 2v, and Adaptive impedance matching module of the present invention and method, by gathering and observing the voltage difference scope of the dominant level in CAN, judge terminal resistance match condition, and make corresponding adjustment.
By the following examples 1 and embodiment 2 pairs of the specific embodiment of the present invention elaborate.
Embodiment 1
The present embodiment 1 provides a kind of CAN Adaptive impedance matching module, described Adaptive impedance matching module is suitable for the voltage difference between the signal wire (CANH, CANL) according to CAN respective end (terminal), with the termination resistance value of this end of Automatic adjusument.
The installation site of described Adaptive impedance matching module is such as but not limited to shown in Fig. 1, at least two Adaptive impedance matching modules lay respectively in two terminals of CAN, an Adaptive impedance matching module is positioned at the 1st near nodal, and another Adaptive impedance matching module is positioned near the n-th node.
1st node and the n-th node are CAN node, adopt prior art to form, such as, comprise CAN transceiver insulation circuit and CAN purpose processor etc.
Further, described Adaptive impedance matching module comprises: voltage detecting circuit, single-chip microcomputer and digital regulation resistance, wherein said voltage detecting circuit for detect CAN respective end signal wire between voltage difference; Described single-chip microcomputer is connected with voltage detecting circuit, and by the output resistance of voltage difference control figure potentiometer as the termination resistance value matched with voltage difference.
Concrete, when described voltage detecting circuit detection voltage difference is between 1.5V-2.5V, the output resistance of described digital regulation resistance is 120 Ω;
When described voltage detecting circuit detection voltage difference is greater than 0.5V and is less than 1.5V, the increase output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference is increased between 1.5V-2.5V;
When described voltage detecting circuit detection voltage difference is greater than 2.5V, the reduction output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference drops between 1.5V-2.5V.
Preferably, the adjustment step value of described output resistance is for example and without limitation to 5 Ω, 10 Ω, 20 Ω, is preferably 10 Ω; And set the scope of output resistance at 10 Ω-600 Ω.
Further, to reset after restart practicality for the ease of this Adaptive impedance matching module, the storage unit in described single-chip microcomputer be also suitable for preserving voltage difference between 1.5V-2.5V time termination resistance value.
The present invention is directed to high-speed CAN bus special applications, when CAN impedance operator changes, regulate terminal resistance to realize coupling adaptively, the reliability of high-speed CAN bus transmission can be improved to a certain extent.The method is simply effective, and in colliery, there is good application prospect in the field such as petrochemical complex, intelligent automobile.
Implement 2
As shown in Figure 2, on embodiment 1 basis, the present embodiment 2 additionally provides a kind of CAN Adaptive impedance matching method, comprises the steps:
Step S1, when CAN is dominant position, detects the voltage difference between the signal wire of CAN two ends respectively;
Step S2, according to the voltage difference of respective end, regulates the termination resistance value of this end.
Further, described termination resistance value realizes regulating by Adaptive impedance matching module, namely
Described Adaptive impedance matching module comprises: voltage detecting circuit, single-chip microcomputer and digital regulation resistance, wherein
Described voltage detecting circuit for detect CAN respective end signal wire between voltage difference;
Described single-chip microcomputer is connected with voltage detecting circuit, and by the output resistance of voltage difference control figure potentiometer as the termination resistance value matched with voltage difference.
Concrete, CAN Adaptive impedance matching method also comprises:
Step S0, to Adaptive impedance matching module initialization, distributes single-chip microcomputer corresponding I/O port.
And described voltage detecting circuit for detect CAN respective end signal wire between the concrete grammar of voltage difference comprise: be connected with voltage detecting circuit by single-chip microcomputer, to detect the voltage differential signal of CAN, and change into the value (abbreviation voltage difference) of corresponding voltage difference.
Further, according to the voltage difference of respective end in described step S2, the method for the termination resistance value of this end is regulated to comprise:
When described voltage detecting circuit detection voltage difference is between 1.5V-2.5V, the output resistance of described digital regulation resistance is 120 Ω;
When described voltage detecting circuit detection voltage difference is greater than 0.5V and is less than 1.5V, the increase output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference is increased between 1.5V-2.5V;
When described voltage detecting circuit detection voltage difference is greater than 2.5V, the reduction output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference drops between 1.5V-2.5V.About adjustment process, voltage difference as shown in Figure 3 and terminal resistance Automatic adjusument curve map in detail.
Preferably, the adjustment step value of described output resistance is for example and without limitation to 5 Ω, 10 Ω, 20 Ω, is preferably 10 Ω.
Further, to reset after restart practicality for the ease of this Adaptive impedance matching module, the storage unit in described single-chip microcomputer be also suitable for preserving voltage difference between 1.5V-2.5V time termination resistance value.
Embodiment 3
In embodiment 1 and embodiment 2 basis, embodiment 3 additionally provides a kind of Adaptive impedance matching system for CAN.
Described Adaptive impedance matching system comprises: the Adaptive impedance matching module described at least two, and two Adaptive impedance matching modules are installed in two terminals of CAN respectively.
Wherein, about the structure of Adaptive impedance matching module and the working method particular content see embodiment 1 and embodiment 2.
With above-mentioned according to desirable embodiment of the present invention for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this invention technological thought, can carry out various change and amendment completely.The technical scope of this invention is not limited to the content on instructions, must determine its technical scope according to right.
Claims (10)
1. a CAN Adaptive impedance matching module, is characterized in that,
Voltage difference between described Adaptive impedance matching module is suitable for according to the signal wire of CAN respective end, with the termination resistance value of this end of Automatic adjusument.
2. CAN Adaptive impedance matching module according to claim 1, is characterized in that,
Described Adaptive impedance matching module comprises: voltage detecting circuit, single-chip microcomputer and digital regulation resistance, wherein
Described voltage detecting circuit for detect CAN respective end signal wire between voltage difference;
Described single-chip microcomputer is connected with voltage detecting circuit, and by the output resistance of voltage difference control figure potentiometer as the termination resistance value matched with voltage difference.
3. CAN Adaptive impedance matching module according to claim 2, is characterized in that,
When described voltage detecting circuit detection voltage difference is between 1.5V-2.5V, the output resistance of described digital regulation resistance is 120 Ω;
When described voltage detecting circuit detection voltage difference is greater than 0.5V and is less than 1.5V, the increase output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference is increased between 1.5V-2.5V;
When described voltage detecting circuit detection voltage difference is greater than 2.5V, the reduction output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference drops between 1.5V-2.5V.
4. CAN Adaptive impedance matching module according to claim 3, is characterized in that, the adjustment step value of described output resistance is 10 Ω.
5. CAN Adaptive impedance matching module according to claim 4, the storage unit in described single-chip microcomputer be also suitable for preserve voltage difference between 1.5V-2.5V time termination resistance value.
6. a CAN Adaptive impedance matching method, is characterized in that, comprise the steps:
Step S1, when CAN is dominant position, detects the voltage difference between the signal wire of CAN two ends respectively;
Step S2, according to the voltage difference of respective end, regulates the termination resistance value of this end.
7. Adaptive impedance matching method according to claim 6, is characterized in that, described termination resistance value realizes regulating by Adaptive impedance matching module, namely
Described Adaptive impedance matching module comprises: voltage detecting circuit, single-chip microcomputer and digital regulation resistance, wherein
Described voltage detecting circuit for detect CAN respective end signal wire between voltage difference;
Described single-chip microcomputer is connected with voltage detecting circuit, and by the output resistance of voltage difference control figure potentiometer as the termination resistance value matched with voltage difference.
8. Adaptive impedance matching method according to claim 7, is characterized in that,
According to the voltage difference of respective end in described step S2, the method for the termination resistance value of this end is regulated to comprise:
When described voltage detecting circuit detection voltage difference is between 1.5V-2.5V, the output resistance of described digital regulation resistance is 120 Ω;
When described voltage detecting circuit detection voltage difference is greater than 0.5V and is less than 1.5V, the increase output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference is increased between 1.5V-2.5V;
When described voltage detecting circuit detection voltage difference is greater than 2.5V, the reduction output resistance of described digital regulation resistance, until voltage detecting circuit detects that voltage difference drops between 1.5V-2.5V.
9. Adaptive impedance matching method according to claim 8, is characterized in that,
The adjustment step value of described output resistance is 10 Ω, and
Storage unit in described single-chip microcomputer be also suitable for preserve voltage difference between 1.5V-2.5V time termination resistance value.
10. the Adaptive impedance matching system for CAN, it is characterized in that, comprise: at least two as arbitrary in claim 1 to 5 as described in Adaptive impedance matching module, and two Adaptive impedance matching modules are installed in two terminals of CAN respectively.
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Cited By (13)
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| 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 |
| CN108123904A (en) * | 2017-11-28 | 2018-06-05 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | A kind of communication bus impedance auto-match device and method |
| CN109343396A (en) * | 2018-10-18 | 2019-02-15 | 艾乐德电子（南京）有限公司 | A kind of and machine CAN build-out resistor automatic identification circuit |
| CN110336725A (en) * | 2019-07-11 | 2019-10-15 | 珠海格力电器股份有限公司 | Method and device for accurately positioning nodes in Controller Area Network (CAN) network |
| CN111526077A (en) * | 2019-02-04 | 2020-08-11 | 恩智浦有限公司 | Controller Area Network (CAN), CAN device and method thereof |
| CN112256612A (en) * | 2020-10-27 | 2021-01-22 | 天津市英贝特航天科技有限公司 | RS-422 bus isolation transceiver capable of automatically adapting terminal resistance |
| CN112290977A (en) * | 2020-10-22 | 2021-01-29 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Adaptive dynamic adjustment method for communication loop |
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| CN114253887A (en) * | 2021-12-20 | 2022-03-29 | 上海同星智能科技有限公司 | Impedance matching adapter, impedance matching system and method |
| CN115695103A (en) * | 2022-11-21 | 2023-02-03 | 深圳数马电子技术有限公司 | Impedance self-adaption method and device, computer equipment and storage medium |
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| CN107276868A (en) * | 2016-04-04 | 2017-10-20 | A-Dec公司 | High-speed communicating network in dental equipment |
| CN106302063A (en) * | 2016-08-12 | 2017-01-04 | 深圳市沃特玛电池有限公司 | CAN communication line Circuits System and terminal resistance connection control method thereof |
| CN108123904A (en) * | 2017-11-28 | 2018-06-05 | 中国船舶科学研究中心（中国船舶重工集团公司第七0二研究所） | A kind of communication bus impedance auto-match device and method |
| 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 |
| CN109343396A (en) * | 2018-10-18 | 2019-02-15 | 艾乐德电子（南京）有限公司 | A kind of and machine CAN build-out resistor automatic identification circuit |
| CN111526077A (en) * | 2019-02-04 | 2020-08-11 | 恩智浦有限公司 | Controller Area Network (CAN), CAN device and method thereof |
| CN110336725A (en) * | 2019-07-11 | 2019-10-15 | 珠海格力电器股份有限公司 | Method and device for accurately positioning nodes in Controller Area Network (CAN) network |
| CN110336725B (en) * | 2019-07-11 | 2020-11-10 | 珠海格力电器股份有限公司 | Method and device for accurately positioning nodes in Controller Area Network (CAN) network |
| CN112290977A (en) * | 2020-10-22 | 2021-01-29 | 中国大唐集团科学技术研究院有限公司华中电力试验研究院 | Adaptive dynamic adjustment method for communication loop |
| CN112256612A (en) * | 2020-10-27 | 2021-01-22 | 天津市英贝特航天科技有限公司 | RS-422 bus isolation transceiver capable of automatically adapting terminal resistance |
| 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 |
| CN114253887A (en) * | 2021-12-20 | 2022-03-29 | 上海同星智能科技有限公司 | Impedance matching adapter, impedance matching system and method |
| WO2023116052A1 (en) * | 2021-12-20 | 2023-06-29 | 上海同星智能科技有限公司 | Impedance matching adapter, and impedance matching system and method |
| CN114217563A (en) * | 2022-01-14 | 2022-03-22 | 华清科盛(北京)信息技术有限公司 | Terminal resistance adjusting method and device of industrial CAN bus based on sorting system |
| CN115695103A (en) * | 2022-11-21 | 2023-02-03 | 深圳数马电子技术有限公司 | Impedance self-adaption method and device, computer equipment and storage medium |
| CN115695103B (en) * | 2022-11-21 | 2024-05-17 | 深圳数马电子技术有限公司 | Impedance self-adaption method, device, computer equipment and storage medium |
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