CN115657594A - Data acquisition system and acquisition method - Google Patents
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Abstract
The invention discloses a data acquisition system and an acquisition method, which relate to the technical field of transmission test benches and comprise a data processing center, wherein the data processing center is in communication connection with a plurality of data acquisition modules, each data acquisition module corresponds to a test bench, and the data acquisition modules are used for acquiring original test data of the test bench; the data processing center is also in communication connection with a plurality of test bed industrial personal computers, and each test bed industrial personal computer corresponds to one test bed; the data processing center receives the original test data sent by each data acquisition module and processes the original test data, and the industrial personal computer of each test stand calls and displays effective test data obtained after the data processing center processes the effective test data. The invention can share the data of a plurality of automatic transmission test benches, has good system stability, high accuracy and stability of test data and high test efficiency, and avoids the phenomena of data loss and inaccuracy.
Description
Technical Field
The invention relates to the technical field of transmission test benches, in particular to a data acquisition system and a data acquisition method for a plurality of transmission test benches.
Background
An automatic transmission is a transmission device capable of automatically performing an automatic shift operation in accordance with a vehicle speed and an engine speed. The quality and the performance of the automatic transmission are directly related to the working performance of an automobile transmission system, so that the quality and the performance of the whole automobile are influenced, and therefore before the automatic transmission leaves a factory, a production enterprise performs a bench test on the automatic transmission to ensure that the quality and the performance of the automatic transmission leaving the factory can meet the design requirements. The pressure and flow data of the clutch of the automatic transmission are required to be acquired when the bench test of the automatic transmission is carried out, at present, simple data acquisition equipment is generally adopted to acquire the pressure and flow data of the clutch, and then the acquired data are directly transmitted to the industrial personal computer of the test bench. The existing simple data acquisition equipment has weak anti-interference capability, often has the phenomenon of data loss or inaccurate data in the operation process, and is easy to damage; meanwhile, data of each test bed cannot be shared, and comparative analysis cannot be carried out in real time during the same test, so that the accuracy and stability of test data are poor, and the test efficiency is low.
Disclosure of Invention
In view of the above drawbacks, the present invention provides a data collecting system and a data collecting method, where the data collecting system and the data collecting method can share data of multiple automatic transmission test benches, can perform comparative analysis on the data in real time, and have the advantages of good system stability, no data loss or inaccuracy, high accuracy and stability of test data, and high test efficiency.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a data acquisition system and an acquisition method comprise a data processing center, wherein the data processing center is in communication connection with a plurality of data acquisition modules, each data acquisition module corresponds to a test bed, and the data acquisition modules are used for acquiring original test data of the test beds; the data processing center is also in communication connection with a plurality of test bed industrial personal computers, and each test bed industrial personal computer corresponds to one test bed; the data processing center receives the original test data sent by the data acquisition modules and processes the original test data, and the industrial personal computer of each test stand calls and displays effective test data obtained after the data processing center processes the effective test data.
The data processing center is in communication connection with a plurality of EthereCAT couplers, and each EthereCAT coupler is electrically connected with one data acquisition module.
The data acquisition module comprises a sensor installed on the test bed and a data acquisition module electrically connected with the sensor, and the data acquisition module is electrically connected with the EthereCAT coupler.
Wherein, the sensor includes pressure sensor and flow sensor, data acquisition module include with pressure acquisition module that pressure sensor electricity is connected with the flow acquisition module that flow sensor electricity is connected, pressure acquisition module with flow acquisition module all with the EthereCAT coupler electricity is connected.
And each EthereCAT coupler is in communication connection with the data processing center through a TCP protocol.
The data processing center comprises a PLC in communication connection with each EthereCAT coupler and a communication board card in communication connection with the PLC, and the communication board cards are in communication connection with each industrial personal computer of the test stand.
The test bench industrial personal computer is connected with the PLC in a communication mode through a CAN network, and labview software is installed in the test bench industrial personal computer.
A data acquisition method implemented according to the data acquisition system described above, comprising the steps of: s1, a data acquisition module acquires original test data detected by a sensor; s2, the data acquisition module sends the acquired original test data to a data processing center through an EthereCAT coupler; s3, the data processing center processes the received original test data to obtain effective test data; s4, the test bed industrial personal computer calls the effective test data from the data processing center; s5, processing the called effective test data by the test bed industrial personal computer; and S6, displaying the processed data by the industrial personal computer of the test bed.
In step S3, the processing of the raw test data by the data processing center includes the following steps: s31, converting the received original test data into digital quantity data; step S32, filtering the digital quantity data obtained in the step S31 to remove burrs; step S33, calculating according to the measuring range of the sensor and the data processed in the step S32 to obtain an actual pressure value and an actual flow value, namely the effective test data; and S34, corresponding the actual pressure value and the actual flow value calculated in the step S33 to the DBC file one by one.
In step S5, the processing of the effective test data by the test bed industrial personal computer includes the following steps: s51, distributing data according to the address channel of the DBC file; step S52, generating data group data; step S53, calculating according to the linear regression equation formula y = a x + b,
wherein:
y-actual data displayed by industrial control computer of test bed
x-data set data
a-ratio of valid test data to data set data
b-sensor offset.
After the technical scheme is adopted, the invention has the beneficial effects that:
the data acquisition system comprises a data processing center, wherein the data processing center is in communication connection with a plurality of data acquisition modules, each data acquisition module corresponds to one test bed, and the data acquisition modules are used for acquiring original test data of the test beds; the data processing center is also in communication connection with a plurality of test bed industrial personal computers, and each test bed industrial personal computer corresponds to one test bed; the data processing center receives the original test data sent by each data acquisition module and processes the original test data, and each test bench industrial control machine transfers and displays the effective test data obtained after the data processing center processes the effective test data. The invention connects the plurality of test beds in a network in a communication way through the network, the plurality of test beds share one data processing center, the number of data processing equipment is reduced, the expansion of the test beds can be realized, the equipment investment cost is low, simultaneously, the data can be shared among the test beds, when the same test is carried out, the data of the test beds can be compared and analyzed in real time, and the evaluation on the test result of the test beds is facilitated. The system has strong anti-interference capability and good stability, the phenomena of data loss and inaccuracy are avoided, the accuracy and the stability of test data are ensured, and meanwhile, the test efficiency of the automatic transmission is greatly improved.
Because the data acquisition method is realized based on the data acquisition system, the data acquired by the data acquisition method is high in accuracy and stability, and the test efficiency of the automatic transmission can be greatly improved.
In summary, the data acquisition system and the data acquisition method provided by the invention solve the technical problems of incapability of sharing test data of the automatic transmission, poor data accuracy, low test efficiency and the like in the prior art, can share data of a plurality of automatic transmission test benches, can perform comparison and analysis of the data in real time, and simultaneously have good system stability, no data loss and inaccuracy, high test data accuracy and stability and high test efficiency.
Drawings
FIG. 1 is a block diagram of the data acquisition system of the present invention.
Detailed Description
The invention is further illustrated below with reference to the figures and examples.
All the orientations referred to in the present specification are based on the orientations shown in the drawings, and only represent relative positional relationships, not absolute positional relationships.
The first embodiment is as follows:
as shown in FIG. 1, the data acquisition system comprises a data processing center, a plurality of data acquisition modules and a plurality of test bed industrial personal computers. Each test bed is correspondingly provided with a data acquisition module and a test bed industrial personal computer, so that the number of the data acquisition modules is equal to that of the test bed industrial personal computers, and the data processing center is in communication connection with the data acquisition modules and is also in communication connection with the test bed industrial personal computers. The data acquisition module is used for acquiring original test data of the test bed, the data processing center receives the original test data sent by each data acquisition module and processes the original test data to obtain effective test data, and each test bed industrial personal computer transfers the effective test data of the test bed obtained after the data processing center processes the effective test data, and the effective test data is displayed after being processed. When a plurality of test beds carry out the same test, the industrial personal computer of each test bed can also call the data of other test beds and carry out real-time comparison and analysis with the data of the test bed of the industrial personal computer. It should be noted that: the four test stands shown in the drawings are only for illustrating the data acquisition system of the present invention in this embodiment, and the test stands to which the data acquisition system of the present invention can be connected are not limited to four, and may be two, three, or seven or eight, which may be selected according to the scale of the test center.
As shown in fig. 1, in the preferred embodiment, the data processing center and the data acquisition modules are in communication connection through ethereat couplers, the number of the ethereat couplers is equal to that of the data acquisition modules, and each data acquisition module is equipped with one ethereat coupler. The EthereCAT coupler is electrically connected with the data acquisition module and is in communication connection with the data processing center. The data acquisition module gathers the data that gather to the EthereCAT coupler, and the EthereCAT coupler sends the data that gather to data processing center through the network.
As shown in fig. 1, the data acquisition module includes a sensor installed on the test bed and a data acquisition module electrically connected to the sensor, and the data acquisition module is electrically connected to the EthereCAT coupler. The sensors in the present embodiment include a pressure sensor for detecting the clutch pressure of the automatic transmission and a flow sensor for detecting the flow rate of the automatic transmission clutch. In the present embodiment, the pressure sensor is preferably a meibeiya pressure sensor, and the output signal is 4 to 20mA. In the present embodiment, the flow sensor is preferably a Haidetney flowmeter, and the output signal is a frequency signal. The data acquisition module in this embodiment includes the pressure acquisition module of being connected with the pressure sensor electricity and the flow acquisition module of being connected with the flow sensor electricity, and pressure acquisition module and flow acquisition module all are connected with the EthereCAT coupler electricity. In the embodiment, the model of the pressure acquisition module is preferably Beifu EL3145, the model of the flow acquisition module is Beifu EL1502, and the model of the EthereCAT coupler is preferably Beifu EK1100.
As shown in fig. 1, the data processing center includes a PLC (Programmable Logic Controller) communicatively connected to each EthereCAT coupler, and a communication board communicatively connected to the PLC, where the communication board is communicatively connected to each test stand industrial personal computer. In the embodiment, the communication board is preferably a Controller Area Network (CAN) communication board, a Universal Serial Bus (USBCAN) interface card is installed on each test bed industrial personal computer, the PLC is in communication connection with each test bed industrial personal computer through a CAN communication Network, and labview software is installed in each test bed industrial personal computer. The PLC processes data sent by the EthereCAT coupler, the data processed by the PLC is sent to a CAN communication network through a CAN communication board card, and the industrial personal computer of the test stand calls the data through a USBCAN interface card and labview software.
As shown in fig. 1, in the present embodiment, it is preferable that each EthereCAT coupler and the PLC are communicatively connected through a TCP (Transmission Control Protocol), that is, each EthereCAT coupler and the data processing center are communicatively connected through a TCP Protocol.
Example two:
a data collection method implemented by the data collection system according to the first embodiment, comprising the steps of:
s1, a data acquisition module acquires original test data detected by a sensor;
s2, the data acquisition module sends the acquired original test data to a data processing center through an EthereCAT coupler;
s3, processing the received original test data by the data processing center to obtain effective test data;
s4, the test bed industrial personal computer calls effective test data from the data processing center;
s5, processing the called effective test data by the industrial personal computer of the test bed;
and S6, displaying the processed data by the industrial personal computer of the test bed.
Specific embodiments of the above six steps are described in detail below.
Step S1:
the pressure sensor detects the pressure value of the clutch of the automatic transmission and outputs a 4-20 mA current signal, and the pressure acquisition module acquires the 4-20 mA current signal output by the pressure sensor. The flow sensor detects a flow value of the automatic transmission clutch and outputs a frequency signal, and the flow acquisition module acquires the frequency signal output by the flow sensor.
Step S2:
the pressure acquisition module and the flow acquisition module collect the acquired original test data to the EthereCAT coupler, and the EthereCAT coupler sends the collected original test data to the PLC through the TPC network.
And step S3:
and the PLC receives the original test data sent by the EthereCAT coupler and processes the received original test data to obtain effective test data.
The PLC processes the original test data, and comprises the following steps:
and S31, converting the received current signal and frequency signal of the original test data into digital quantity data. Pressure data: the PLC firstly converts a current signal of 4-20 mA into a voltage signal of 1-5V, and then converts the voltage signal of 1-5V into digital quantity data. Flow data: the PLC converts the frequency signal into a voltage signal of 1-5V and then converts the voltage signal of 1-5V into digital data.
And step S32, filtering the digital quantity data obtained in the step S31 to remove burrs.
And step S33, calculating according to the measuring range of the sensor and the data obtained after processing in step S32 to obtain an actual pressure value and an actual flow value, namely effective test data. For example: the output signal of the pressure sensor is 4-20 mA, if the measuring range is 0-1 MP, the voltage signal corresponding to 4-20 mA is 1-5V, 1V corresponds to 0MP and 5V corresponds to 1MP in PLC, and the actual pressure value is obtained by multiplying the digital quantity data filtered in the step S32 by 1/5. The method for calculating the flow value is the same as the method for calculating the pressure value, and therefore, the detailed description thereof is omitted.
And S34, corresponding the actual pressure value and the actual flow value calculated in the step S33 to a DBC file (file of a CAN communication matrix) one by one, namely, correlating the data with physical addresses in the DBC file so that the industrial personal computer of the test bed CAN call effective test data.
And step S4:
the industrial personal computer of the test bed calls effective test data from the data processing center, namely calls the effective test data of the test bed or the effective test data of other test beds according to the DBC file.
Step S5:
the test bed industrial personal computer processes the called effective test data, and the method comprises the following steps:
s51, distributing data according to the address channel of the DBC file;
step S52, generating data group data;
step S53, calculating according to the linear regression equation formula y = a x + b,
wherein:
y-actual data displayed by industrial control computer of test bed
x-data set data
a-ratio of valid test data to data set data
b-sensor offset.
In step S53, since data is converted during network transmission, data of data generated by the industrial personal computer on the test bed is inconsistent with the effective test data calculated by the PLC, and therefore data needs to be back-extrapolated according to the formula of the linear regression equation at this step, so that the data finally displayed by the industrial personal computer on the test bed is consistent with the data calculated by the PLC. In the present embodiment: the pressure value is calculated by a =0.00755, b = -2.125 in the formula; the flow value calculation formula is a = 0.00390625 and b =0, but a and b are not fixed values in practical applications. Wherein a is calibrated, more points are collected during the test, and the ratio of the effective test data (namely the actual pressure and the actual flow) to the numerical value (data group data) directly displayed on the industrial personal computer of the test bed is the value of a; b is the offset of the sensor, after determining the two values a and b, the program of the test bed industrial personal computer is modified, and the data group data is calculated by the formula y = a x + b, so that the actual pressure value and the actual flow value are obtained and displayed by the test bed industrial personal computer.
The data acquisition system and the data acquisition method of the invention connect the plurality of test beds in a network through the network, the plurality of test beds share one data processing center, the number of data processing equipment is reduced, the expansion of the test beds can be realized, the equipment investment cost is low, meanwhile, the data among the test beds can be shared, when the same test is carried out, the data of each test bed can be compared and analyzed in real time, and the evaluation of the test result of each test bed is facilitated. The system has strong anti-interference capability and good stability, the phenomena of data loss and inaccuracy are avoided, the accuracy and the stability of test data are ensured, and meanwhile, the test efficiency of the automatic transmission is greatly improved.
The present invention is not limited to the above-described embodiments, and various modifications made by those skilled in the art without inventive skill from the above-described conception fall within the scope of the present invention.
Claims (10)
1. The data acquisition system is characterized by comprising a data processing center, wherein the data processing center is in communication connection with a plurality of data acquisition modules, each data acquisition module corresponds to one test bed, and the data acquisition modules are used for acquiring original test data of the test beds; the data processing center is also in communication connection with a plurality of test bed industrial personal computers, and each test bed industrial personal computer corresponds to one test bed; the data processing center receives the original test data sent by the data acquisition modules and processes the original test data, and the industrial personal computer of each test stand calls and displays effective test data obtained after the data processing center processes the effective test data.
2. The data acquisition system of claim 1, wherein the data processing center is communicatively coupled with a plurality of EthereCAT couplers, each of the EthereCAT couplers being electrically coupled with one of the data acquisition modules.
3. The data acquisition system of claim 2, wherein the data acquisition module comprises a sensor mounted on the test bed and a data acquisition module electrically connected to the sensor, the data acquisition module being electrically connected to the EthereCAT coupler.
4. The data acquisition system of claim 3, wherein the sensor comprises a pressure sensor and a flow sensor, the data acquisition module comprises a pressure acquisition module electrically connected to the pressure sensor and a flow acquisition module electrically connected to the flow sensor, the pressure acquisition module and the flow acquisition module are both electrically connected to the EthereCAT coupler.
5. The data acquisition system of claim 2, wherein each of the EthereCAT couplers is communicatively coupled to the data processing center via a TCP protocol.
6. The data acquisition system of claim 5, wherein the data processing center comprises a PLC communicatively coupled to each EthereCAT coupler and a communication board communicatively coupled to the PLC, the communication board communicatively coupled to each test stand industrial personal computer.
7. The data acquisition system of claim 6, wherein the communication board card is a CAN communication board card, a USBCAN interface card is installed on the test bed industrial personal computers, the PLC is in communication connection with each test bed industrial personal computer through a CAN network, and labview software is installed in each test bed industrial personal computer.
8. The data acquisition method implemented by the data acquisition system according to any one of claims 1 to 7, comprising the steps of:
s1, a data acquisition module acquires original test data detected by a sensor;
s2, the data acquisition module sends the acquired original test data to a data processing center through an EthereCAT coupler;
s3, the data processing center processes the received original test data to obtain effective test data;
s4, the test bed industrial personal computer calls the effective test data from the data processing center;
s5, processing the called effective test data by the test bed industrial personal computer;
and S6, displaying the processed data by the industrial personal computer of the test bed.
9. The data collection method of claim 8, wherein in step S3, the processing of the raw test data by the data processing center comprises the steps of:
s31, converting the received original test data into digital quantity data;
step S32, filtering the digital quantity data obtained in the step S31 to remove burrs;
step S33, calculating according to the measuring range of the sensor and the data processed in the step S32 to obtain an actual pressure value and an actual flow value, namely the effective test data;
and S34, corresponding the actual pressure value and the actual flow value calculated in the step S33 to the DBC file one by one.
10. The data acquisition method of claim 9, wherein in the step S5, the processing of the valid test data by the test bed industrial personal computer comprises the steps of:
s51, distributing data according to the address channel of the DBC file;
step S52, generating data group data;
step S53, calculating according to the linear regression equation formula y = a x + b,
wherein:
y-actual data displayed by industrial control computer of test bed
x-data set data
a-ratio of valid test data to data set data
b-sensor offset.
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