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CN105827554B - A method and device for optimizing FlexRay bus node matching resistance - Google Patents

A method and device for optimizing FlexRay bus node matching resistance Download PDF

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Publication number
CN105827554B
CN105827554B CN201610136995.3A CN201610136995A CN105827554B CN 105827554 B CN105827554 B CN 105827554B CN 201610136995 A CN201610136995 A CN 201610136995A CN 105827554 B CN105827554 B CN 105827554B
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flexray bus
flexray
node
10mhz
bus node
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CN105827554A (en
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王平
杜炜
李娜
李刚健
谢解解
江金洋
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Chongqing University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0264—Arrangements for coupling to transmission lines
    • H04L25/0278—Arrangements for impedance matching

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
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  • Dc Digital Transmission (AREA)

Abstract

本发明涉及一种FlexRay总线节点匹配电阻的优化方法及装置，属于数据总线通信技术领域；在本发明中，通过该装置对FlexRay总线施加激励信号，通过测量和计算FlexRay总线节点的电压信号，并结合FlexRay总线的分布参数模型，获得关于FlexRay总线的最佳匹配阻抗。本发明可以有效提高FlexRay总线信号通信的质量，降低数据通信过程中的误码率，确保FlexRay总线数据通信的稳定性与可靠性。

The invention relates to a method and a device for optimizing the matching resistance of a FlexRay bus node, belonging to the technical field of data bus communication; in the present invention, an excitation signal is applied to the FlexRay bus through the device, and the voltage signal of the FlexRay bus node is measured and calculated, and the Combined with the distributed parameter model of the FlexRay bus, the optimal matching impedance of the FlexRay bus is obtained. The invention can effectively improve the quality of the FlexRay bus signal communication, reduce the bit error rate in the data communication process, and ensure the stability and reliability of the FlexRay bus data communication.

Description

A kind of optimization method and device of FlexRay bus node build-out resistor
Technical field
The invention belongs to data bus communication technical fields, are related to a kind of optimization of FlexRay bus node build-out resistor Method and device.
Background technique
Automotive electronics has become a staple market of automobile industry, and the maximum hot spot of Automobile Electronic Industry is exactly network Change.Automobile of today is already a mobile massaging device, by in-vehicle network system, can receive, sends and handle A large amount of data make necessary reaction to certain situations.Necessarily the degree of automation is increasingly for the development trend of future automobile Height keeps automobile safer, more reliable, more comfortable, it means that use more sensors, transmission device and electronics control in the car Unit processed, this will also put forward higher requirements In-vehicle networking.For the demand for development of future automobile In-vehicle networking, FlexRay It comes into being.FlexRay is concerned with some core demands of current automobile industry, including faster data rate, more flexible Data communication, more fully topology selection and fault-tolerant operation etc..The appearance of FlexRay compensates for existing bus protocol application In automobile line control system or the deficiency too low with fault-tolerance when safety-related system and transmission rate, and will gradually replace CAN bus becomes the automobile bus of a new generation.
Requirement to FlexRay is that reliable, real-time and very efficient number is provided between electrically and mechanically electronic component According to transmission.The peak data transfer rate in each channel of FlexRay bus is 10MBit/s, therefore FlexRay is one very high The system of speed.But it if the impedance matching of FlexRay bus does not design, will lead under data traffic signals quality Drop, the excessively high bit error rate will lead to entire FlexRay bus system communication efficiency sharp fall, even result in entire FlexRay bus cisco unity malfunction.
In conclusion urgent need invents one kind and can be improved FlexRay bus signals communication quality, the impedance of the bit error rate is reduced Matched optimization method, to improve the reliability and stability of FlexRay bus comprehensively.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of optimization method of FlexRay bus node build-out resistor and Device applies pumping signal to FlexRay bus by the device, by the voltage for measuring and calculating FlexRay bus node Signal, and the distributed parameter model of FlexRay bus is combined, obtain the best match impedance about FlexRay bus.This method It can effectively improve FlexRay bus signals communication quality, reduce the bit error rate in data communication process, it is ensured that FlexRay is total The Stability and dependability of line data communication.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of optimization method of FlexRay bus node build-out resistor, comprising the following steps:
S1: the Chirp code signal source of 1M~10MHz is successively motivated to each node of FlexRay bus；
S2: when Chirp code signal source forcing FlexRay some node of bus, speed A/D converter is in synchronization signal Under the action of SYNC, the differential signal of other all FlexRay bus nodes is successively acquired；
S3: according to actual FlexRay physical bus Node distribution, the distributed parameter model of FlexRay bus is constructed；
S4: by the data of actual acquisition, the distributed parameter model of FlexRay bus is substituted into, calculates and obtains FlexRay bus The terminal coupling resistance of each node.
Further, in step sl, it specifically includes:
S11: 1M~10MHz Chirp code signal source, the expression formula of the signal source are as follows:
Wherein the bandwidth B in Chirp code signal source is 10MHz, and duration T 10uS, t are time variable, and cos () is Cosine function；
S12: when the Chirp code signal source output drive FlexRay bus node of 1M~10MHz, output is corresponding same Walk signal SYNC.
Further, in step s 4, it specifically includes:
S41: according to the characteristic in Chirp code signal source, substituting into the measurement parameter of different FlexRay nodes respectively, by with Lower formula (2) be calculated 1MHz, 2MHz, 3MHz ..., 10MHz amount to 10 groups of a, b numerical value: [a1,b1], [a2,b2] ..., [a10,b10]；
In formula (2), UocFor the voltage signal at FlexRay bus node, the Chirp code excited that U is 1MHz~10MHz is believed Number, L is distance of the FlexRay bus node apart from pumping signal, and cosh () is hyperbolic cosine function, and cos () is cosine letter Number；
S42: according to formula (3), 10 groups of a, b numerical value: [a is substituted into respectively1,b1], [a2,b2] ..., [a10,b10], it calculates Obtain 10 groups of R0、L0、C0、G0Distribution parameter,It is denoted as [R respectively01,L01,C01,G01], [R02,L02,C02,G02] ..., [R010, L010,C010,G010]；
F is a, the corresponding frequency of b numerical value, R in formula (3)0For unit line segment resistance, L0For unit line segment inductance, C0For unit Differential coupling capacitor, the G of line segment0For the leakage conductance of unit difference line segment；
S43: [a is substituted into respectively1,b1]、[a2,b2] and corresponding frequency f, equation group is established by formula (3), is asked [R can be obtained in solution01,L01,C01,G01], then substitute into [a2,b2], [a3,b3], [R can be obtained in solution02,L02,C02,G02], with This analogizes, and finally substitutes into [a10,b10], [a1,b1], [R can be obtained in solution010,L010,C010,G010]；
S44: according to the communication frequency f of FlexRay bus, the corresponding R of respective communication frequency is substituted into0、L0、C0、G0Parameter, Using the Dai Weinan principle of equal effects by the peripheral circuit equivalent predigesting of FlexRay bus node be two-port network model, to count Calculation obtains the equivalent matched resistance of FlexRay bus node.
The present invention also provides a kind of optimization device of FlexRay bus node build-out resistor, including speed A/D converter, High-speed DAC converter, high speed amplifier, field programmable logic device FPGA and microcontroller STM32F407；
The Chirp code letter of field programmable logic device FPGA output 1MHz~10MHz of FlexRay bus test device Number through high-speed DAC converter and amplifier driving after, as the pumping signal of FlexRay bus, while exporting the synchronization of Chirp code Signal SYNC；
Speed A/D converter carries out data by high-speed AD controller and adopts under the synchronization signal SYNC effect of Chirp code Sample, sampled result are placed in the high speed dual port RAM inside field programmable logic device FPGA；
Microcontroller STM32F407 reads sampling data results, calculates in the internal distribution parameter for completing FlexRay bus Optimization with node matching resistance calculates.
The beneficial effects of the present invention are: present invention employs a kind of sides of FlexRay bus node build-out resistor optimization Method has the Chirp code signal of specific frequency by device transmitting, tests the voltage's distribiuting of FlexRay bus node, in conjunction with The physical model of FlexRay bus calculates the distribution parameter for obtaining FlexRay bus, finally applies the Dai Weinan principle of equal effects pair FlexRay bus is simplified, to calculate the equivalent matched impedance resistors for obtaining FlexRay bus.This method can obtain The build-out resistor of accurate FlexRay bus node effectively improves the conventional method for rule of thumb selecting build-out resistor, The problems such as to improve the communication quality of FlexRay bus, significantly reduce the bit error rate of FlexRay bus.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out Illustrate:
Fig. 1 is the flow diagram of the method for the invention；
Fig. 2 is the distributed parameter model of FlexRay bus；
Fig. 3 is FlexRay bus distribution parameter test schematic diagram.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
Fig. 1 is the flow diagram of the method for the invention, as shown, excellent in FlexRay bus node build-out resistor During change, comprising the following steps:
Step 1: each section of FlexRay bus is successively motivated in the Chirp code signal source of 1M~10MHz by test device Point；
The expression formula in the Chirp code signal source of the 1M~10MHz used in step 1 for
Wherein the bandwidth B in Chirp code signal source is 10MHz, and duration T 10uS, t are time variable, and cos () is Cosine function；When the Chirp code signal source output drive FlexRay bus node of 1M~10MHz, corresponding synchronous letter is exported Number SYNC.
Step 2: when the node of Chirp code signal source forcing FlexRay bus, speed A/D converter is in synchronization signal Under the action of SYNC, the differential signal of other all FlexRay bus nodes is successively acquired；
Step 3: according to actual FlexRay physical bus Node distribution, the distribution parameter mould of FlexRay bus is constructed Type.Specific practice is to construct point of FlexRay bus according to actual FlexRay physical bus length, material and Node distribution Cloth parameter model, R0For unit line segment resistance, L0For unit line segment inductance, C0For differential coupling capacitor, the G of unit line segment0For list The leakage conductance of potential difference separated time section；Fig. 2 is the distributed parameter model of FlexRay bus.
Step 4: by the data of actual acquisition, the distributed parameter model of FlexRay bus is substituted into, calculates and obtains FlexRay The terminal coupling resistance of each node of bus.Specific method is:
1) by following formula (2) be calculated 1MHz, 2MHz, 3MHz ..., 10MHz amount to 10 groups of a, b numerical value: [a1,b1], [a2,b2] ..., [a10,b10]；
In formula (2), UocFor the voltage signal at FlexRay bus node, the Chirp code excited that U is 1MHz~10MHz is believed Number, L is distance of the FlexRay bus node apart from pumping signal, and cosh () is hyperbolic cosine function, and cos () is cosine letter Number；
2): according to formula (3), substituting into 10 groups of a, b numerical value: [a respectively1,b1], [a2,b2] ..., [a10,b10], it calculates To 10 groups of R0、L0、C0、G0Distribution parameter, be denoted as [R respectively01,L01,C01,G01], [R02,L02,C02,G02] ..., [R010,L010, C010,G010]；
F is a, the corresponding frequency of b numerical value, R in formula (3)0For unit line segment resistance, L0For unit line segment inductance, C0For unit Differential coupling capacitor, the G of line segment0For the leakage conductance of unit difference line segment；
3): substituting into [a respectively1,b1]、[a2,b2] and corresponding frequency f, equation group is established by formula (3), is solved [R can be obtained01,L01,C01,G01], then substitute into [a2,b2], [a3,b3], [R can be obtained in solution02,L02,C02,G02], with this Analogize, finally substitutes into [a10,b10], [a1,b1], [R can be obtained in solution010,L010,C010,G010]；
4): according to the communication frequency f of FlexRay bus, substituting into the corresponding R of respective communication frequency0、L0、C0、G0Parameter is answered It by the peripheral circuit equivalent predigesting of FlexRay bus node is two-port network model with the Dai Weinan principle of equal effects, to calculate Obtain the equivalent matched resistance of FlexRay bus node.Fig. 3 is FlexRay bus distribution parameter test schematic diagram.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be Various changes are made to it in form and in details, without departing from claims of the present invention limited range.

Claims (4)

1.一种FlexRay总线节点匹配电阻的优化方法，其特征在于：包括以下步骤：1. an optimization method of FlexRay bus node matching resistance, is characterized in that: comprise the following steps: S1：将1M～10MHz的Chirp码信号源依次激励FlexRay总线的每个节点；S1: Stimulate each node of the FlexRay bus in sequence with the 1M～10MHz Chirp code signal source; S2：当Chirp码信号源激励FlexRay总线的某个节点时，高速AD转换器在同步信号SYNC的作用下，依次采集其他所有FlexRay总线节点的差分信号；S2: When the Chirp code signal source excites a node of the FlexRay bus, the high-speed AD converter collects the differential signals of all other FlexRay bus nodes in turn under the action of the synchronization signal SYNC; S3：根据实际的FlexRay物理总线节点分布，构建FlexRay总线的分布参数模型；S3: According to the actual FlexRay physical bus node distribution, build the distribution parameter model of the FlexRay bus; S4：将实际采集的数据代入FlexRay总线的分布参数模型，计算获得FlexRay总线各个节点的终端匹配电阻。S4: Substitute the actual collected data into the distributed parameter model of the FlexRay bus, and calculate and obtain the terminal matching resistance of each node of the FlexRay bus. 2.根据权利要求1所述的一种FlexRay总线节点匹配电阻的优化方法，其特征在于：在步骤S1中，具体包括：2. the optimization method of a kind of FlexRay bus node matching resistance according to claim 1, is characterized in that: in step S1, specifically comprises: S11：所述1M～10MHz的Chirp码信号源，该信号源的表达式为：S11: The 1M～10MHz Chirp code signal source, the expression of the signal source is: 其中Chirp码信号源的带宽B为10MHz，持续时间T为10uS，t为时间变量，cos(.)为余弦函数；The bandwidth B of the Chirp code signal source is 10MHz, the duration T is 10uS, t is the time variable, and cos(.) is the cosine function; S12：当1M～10MHz的Chirp码信号源输出激励FlexRay总线节点时，输出相应的同步信号SYNC。S12: When the output of the 1M-10MHz Chirp code signal source excites the FlexRay bus node, the corresponding synchronization signal SYNC is output. 3.根据权利要求1所述的一种FlexRay总线节点匹配电阻的优化方法，其特征在于：在步骤S4中，具体包括：3. the optimization method of a kind of FlexRay bus node matching resistance according to claim 1, is characterized in that: in step S4, specifically comprises: S41：根据Chirp码信号源的特性，分别代入不同FlexRay节点的测量参数，通过以下公式(2)计算得到1MHz、2MHz、3MHz、…、10MHz的共计10组a、b数值：[a1,b1]，[a2,b2]，…，[a10,b10]；S41: According to the characteristics of the Chirp code signal source, substitute the measurement parameters of different FlexRay nodes respectively, and obtain a total of 10 groups of a and b values of 1MHz, 2MHz, 3MHz, ..., 10MHz through the following formula (2): [a 1 ,b 1 ], [a 2 , b 2 ], ..., [a 10 , b 10 ]; 式(2)中，Uoc为FlexRay总线节点处的电压信号，U为1MHz～10MHz的Chirp码激励信号，L为FlexRay总线节点距离激励信号的距离，cosh(.)是双曲余弦函数，cos(.)为余弦函数；In formula (2), U oc is the voltage signal at the FlexRay bus node, U is the Chirp code excitation signal of 1MHz to 10MHz, L is the distance between the FlexRay bus node and the excitation signal, cosh(.) is the hyperbolic cosine function, cos (.) is the cosine function; S42：根据公式(3)，分别代入10组的a、b数值：[a1,b1]，[a2,b2]，…，[a10,b10]，计算得到10组R0、L0、C0、G0的分布参数，分别记为[R01,L01,C01,G01]，[R02,L02,C02,G02]，…，[R010,L010,C010,G010]；S42: According to formula (3), 10 groups of a and b values are respectively substituted: [a 1 , b 1 ], [a 2 , b 2 ], ..., [a 10 , b 10 ], and 10 groups of R 0 are obtained by calculation The distribution parameters of , L 0 , C 0 , G 0 are respectively recorded as [R 01 , L 01 , C 01 , G 01 ], [R 02 , L 02 , C 02 , G 02 ], …, [R 010 , L 010 , C 010 , G 010 ]; 式(3)中f为a，b数值对应的频率，R0为单位线段电阻、L0为单位线段电感、C0为单位线段的差分耦合电容、G0为单位差分线段的漏电导；In formula (3), f is the frequency corresponding to the values of a and b, R 0 is the unit line segment resistance, L 0 is the unit line segment inductance, C 0 is the differential coupling capacitance of the unit line segment, and G 0 is the unit differential line segment leakage conductance; S43：分别代入[a1,b1]、[a2,b2]和与之对应的频率f，通过公式(3)建立方程组，求解即可得到[R01,L01,C01,G01]，然后代入[a2,b2]，[a3,b3]，求解即可得到[R02,L02,C02,G02]，以此类推，最后代入[a10,b10]，[a1,b1]，求解即可得到[R010,L010,C010,G010]；S43: Substitute [a 1 , b 1 ], [a 2 , b 2 ] and the corresponding frequency f respectively, establish the equation system through formula (3), and solve it to obtain [R 01 , L 01 , C 01 , G 01 ], then substitute in [a 2 ,b 2 ], [a 3 ,b 3 ], solve to get [R 02 ,L 02 ,C 02 ,G 02 ], and so on, and finally substitute in [a 10 , b 10 ], [a 1 ,b 1 ], solve to get [R 010 , L 010 , C 010 , G 010 ]; S44：根据FlexRay总线的通信频率f，代入相应通信频率对应的R0、L0、C0、G0参数，应用戴维南等效原理将FlexRay总线节点的外围电路等效化简为二端口网络模型，从而计算得到FlexRay总线节点的等效匹配电阻。S44: According to the communication frequency f of the FlexRay bus, substitute the R 0 , L 0 , C 0 , and G 0 parameters corresponding to the corresponding communication frequency, and apply the Thevenin equivalence principle to simplify the peripheral circuit of the FlexRay bus node into a two-port network model. , so as to calculate the equivalent matching resistance of the FlexRay bus node. 4.一种FlexRay总线节点匹配电阻的优化装置，其特征在于：包括高速AD转换器、高速DAC转换器、高速运放、现场可编程逻辑器件FPGA和微控制器STM32F407；4. an optimization device for FlexRay bus node matching resistance, characterized in that: comprising high-speed AD converter, high-speed DAC converter, high-speed operational amplifier, field programmable logic device FPGA and microcontroller STM32F407; 现场可编程逻辑器件FPGA用于输出数据经高速DAC转换器和运放驱动后得到1MHz～10MHz FlexRay总线的Chirp码信号源，同时输出Chirp码的同步信号SYNC；The field programmable logic device FPGA is used to output the data to obtain the Chirp code signal source of the 1MHz~10MHz FlexRay bus after being driven by the high-speed DAC converter and operational amplifier, and output the synchronization signal SYNC of the Chirp code at the same time; 高速AD转换器，其用于在Chirp码的同步信号SYNC作用下，通过高速AD控制器进行数据采样，采样结果放在现场可编程逻辑器件FPGA内部的高速双口RAM中；The high-speed AD converter is used for data sampling through the high-speed AD controller under the action of the synchronization signal SYNC of the Chirp code, and the sampling result is placed in the high-speed dual-port RAM inside the field programmable logic device FPGA; 微控制器STM32F407用于读取采样数据结果，在内部完成FlexRay总线的分布参数计算和节点匹配电阻的优化计算。The microcontroller STM32F407 is used to read the sampling data results, and internally complete the calculation of the distribution parameters of the FlexRay bus and the optimization calculation of the node matching resistance.
CN201610136995.3A 2016-03-10 2016-03-10 A method and device for optimizing FlexRay bus node matching resistance Expired - Fee Related CN105827554B (en)

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