CN102280019A - Electric power-assisted steering test bench data acquisition device and network system - Google Patents
Electric power-assisted steering test bench data acquisition device and network system Download PDFInfo
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- CN102280019A CN102280019A CN201110174564A CN201110174564A CN102280019A CN 102280019 A CN102280019 A CN 102280019A CN 201110174564 A CN201110174564 A CN 201110174564A CN 201110174564 A CN201110174564 A CN 201110174564A CN 102280019 A CN102280019 A CN 102280019A
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Abstract
The invention discloses an electric power-assisted steering test bench data acquisition device and a network system. The electric power-assisted steering test bench data acquisition device comprises a main torque sensor (1), an auxiliary torque sensor (2), a current sensor (3), a vehicle speed sensor (4), a rotary angle sensor (5), a data acquisition microprogrammed control unit (MCU) (6) and a controller area network (CAN) transmitter-receiver (8). A CAN controller embedded in the data acquisition MCU (6) is connected to the CAN transmitter-receiver (8). The data acquisition MCU (6) is provided with a linking module, a data acquisition module and a CAN driving module. The network system comprises two or more the electric power-assisted steering test bench data acquisition devices and the electric power-assisted steering test bench data acquisition devices are connected through the CAN transmitter-receiver (8). The electric power-assisted steering test bench data acquisition device realizes real-time synchronous data acquisition and the network system realizes real-time synchronous data acquisition of multiple test benches.
Description
Technical field
The present invention relates to a kind of data collector, relate in particular to the data collector that is used for electric power-assisted steering test stand and embedded the network system that the CAN bus functionality is realized the electric power-assisted steering test stand data acquisition.
Background technology
Automobile electric booster steering system (EPS) is a kind of novel steering system that development in recent years is got up, this system be by electronic control unit according to sensor acquisition to signal control the running of motor, thereby realize power-steering function.EPS not only possesses the advantages such as light that turn to of hydraulic power steering device, it also have turn to steadily, energy-saving and environmental protection, increase substantially vehicle economy, dynamic property and maneuverability, increase the maneuverability and the security of human pilot simultaneously.Therefore, EPS becomes one of focus of automotive field research and development.
Research and development have the process of independent intellectual property right EPS; general elder generation utilizes electric power-assisted steering test stand that performance and the control strategy of EPS are detected in the laboratory; problem at aspects such as detected function, logic, precision, safeguard protections; revise the hardware and software of EPS; carry out the test-bed test of next round; after such repetition test was revised, reached the requirement of expection as EPS, real train test was carried out in entrucking again.Adopt such method exploitation EPS, can save great amount of manpower and material resources and financial resources, and can shorten the R﹠D cycle of EPS.
The size of the electric current that steering column assist torque that EPS produces and assist motor are required depends on the angular signal of vehicle speed signal and steering wheel.In the process of the test, the angular signal of vehicle speed signal, steering wheel, steering column assist torque signal and assist motor current signal are gathered in real time, rationally stored and show in good time is the test key of success.Using multimeter and oscillograph is that to obtain test figure be the method for using always, and there is following problem in this method: the first, the data acquisition speed is slow.This method need manually in process of the test to each signal measure one by one, record, and need to measure the value of each signal different time points, workload is big, speed is slow.The second, it is poor to obtain data sync.Owing to be artificial signal measurement one by one, can not measure simultaneously each signal, thereby influence the data synchronization that obtains.Three, manual measurement is made mistakes easily, efficient is low.Four, the data that collect are handled after by artificial input computing machine, need a large amount of artificial input datas' time.The method that another kind obtains experimental data is installation data collection plate and a corresponding driving program in the PC computing machine, comes the signal of various sensors is gathered with data acquisition board.Though this method can improve the collecting efficiency and the acquisition precision of data greatly, have following problems: the first, data acquisition board will have and the corresponding bus interface of PC computer motherboard.The second, all need the corresponding lead that is connected between each sensor and data acquisition board, cause testing table and intercomputer that a lot of leads is arranged.Three, data acquisition program will be write based on the driver of data acquisition board, and can make data display program and data storing program etc. is not very clear on logical organization.If the 4th will carry out data acquisition to two or more testing tables, then need two covers or above data acquisition board and the PC computing machine of two covers.
In sum, need a kind of new data collector, the various signals that EPS on the test-bed is produced in process of the test carry out accurately real-time obtaining, by adjustment, obtain power-assisted electric current required under the different speed of a motor vehicle and corresponding steering wheel assist torque to circuit and the program parameter of EPS on the test-bed.Adjusted circuit parameter is as the foundation of EPS hardware design, and the adjusted program parameter and the corresponding speed of a motor vehicle deposit the foundation of the ROM of EPS as EPS generation power-assisted size in.Automobile in the process of moving, EPS searches the parameter corresponding to the corresponding power-assisted electric current of the generation of the speed of a motor vehicle according to the vehicle speed sensor signal from ROM, and controls the assist motor driving circuit with this parameter, under the corresponding current drives of driving circuit, assist motor produces the power-assisted of required size.Simultaneously, can overcome the weak point of above-mentioned two kinds of collecting methods effectively.
Summary of the invention
The purpose of this invention is to provide a kind of harvester that electric power-assisted steering test stand is carried out real-time data acquisition.
Another object of the present invention provides a kind of CAN bus functionality that embedded, and has realized the network system to a plurality of electric power-assisted steering test stand real-time data acquisitions.
Technical scheme of the present invention is: a kind of electric power-assisted steering test stand data collector comprises main torque sensor, assistive torque sensor, current sensor, vehicle speed sensor, rotary angle transmitter, data acquisition MCU and CAN transmitter-receiver; Described main torque sensor is connected with embedded A/D ALT-CH alternate channel ADC0, the ADC1 of data acquisition MCU respectively with the assistive torque sensor; Described current sensor is connected with the embedded A/D ALT-CH alternate channel ADC2 of data acquisition MCU behind sampling resistor; Described vehicle speed sensor and rotary angle transmitter are connected respectively to pulse capture T1, the T2 interface of data acquisition MCU; The embedded CAN controller of described data acquisition MCU links to each other with described CAN transmitter-receiver; Be provided with link block, data acquisition module and CAN driver module among the described data acquisition MCU; Described data acquisition module be used for to the data acquisition of sensor and with the communication of link block; The data that described CAN driver module is used for described CAN transmitter-receiver send to receive and with the communication of link block; The data that described link block is used for data acquisition MCU transmit, command interpretation work.
Further, described data acquisition MCU6 is connected with data handling machine by serial line interface, and described data handling machine comprises data communication module, database module, subscriber interface module and intermediary's module; Described intermediary module is used for data communication module, database module, subscriber interface module are coupled together, and carries out data communication by communication protocol.
Further, described communication protocol comprises object module code, communication port code, traffic category code and communications command code; Described object module code is used to identify the module that communicates with described intermediary module; Described communication port code is used to identify the port that communicates with described data acquisition MCU6; Described traffic category code is used to identify the type that communicates with described intermediary module; Described communications command code is used to identify the order that communicates with described intermediary module.
Further, described communication protocol also comprises input and output parameter; Described input parameter is used for identification data input data acquisition MCU6; Described output parameter is used for identification data and is exported by data acquisition MCU.
Further, described communication port code is a serial ports 1 to one of them numeral of serial ports 255.
Further, described traffic category code is data code, control routine or security code.
A kind of electric power-assisted steering test stand data acquisition network system comprises two and above above-mentioned data collector, and the CAN transmitter-receiver of described data acquisition links to each other mutually.
The invention has the beneficial effects as follows: by data acquisition MCU and a plurality of sensor ways of connecting, realized that data synchronization gathers in real time, reduced wiring; By embedding the CAN bus functionality among the data acquisition MCU6, can realize that the CAN bus of two and above data acquisition MCU6 connects, realize that the network test bed system that a plurality of testing tables are made carries out real-time data acquisition synchronously.By adopting intermediary's module and the mode that other modules cooperate, management of being convenient to communicate and expansion.
Description of drawings
Fig. 1 electric power-assisted steering test stand data acquisition system (DAS) structural drawing;
Fig. 2 electric power-assisted steering test stand data acquisition system (DAS) module connection layout;
Fig. 3 electric power-assisted steering test stand data acquisition system (DAS) circuit diagram;
Fig. 4 data acquisition display interface figure.
Embodiment
Fig. 1 is an electric power-assisted steering test stand data acquisition system (DAS) structural drawing.As shown in the figure, data acquisition system (DAS) comprises main torque sensor 1, assistive torque sensor 2, current sensor 3, vehicle speed sensor 4, rotary angle transmitter 5, data acquisition MCU6, data handling machine 7 and CAN transmitter-receiver 8.Main in an embodiment torque sensor 1 and assistive torque sensor 2 all are the electric potential type sensor, current sensor 3 adopts CS020G, vehicle speed sensor 4 is an electromagnetic sensor, data acquisition MCU6 adopts the P89C591 of embedded CAN2.0B controller, CAN transmitter-receiver 8 is TJA1050, and data handling machine 7 adopts common PC.
Shown in the circuit diagram of Fig. 3, main torque sensor 1, assistive torque sensor 2 are connected with P1.2, the P1.3 pin of data acquisition MCU6 respectively after RC filtering, current sensor 3 links to each other with the P1.4 of data acquisition MCU6 after the current/voltage translation filtering amplifies, and data acquisition MCU6 gathers moment of torsion and current signal respectively with embedded A/D converter.Vehicle speed sensor 4 (, rotary angle transmitter 5 signals are connected respectively to P3.4, the P3.5 pin of data acquisition MCU6 behind filter shape, data acquisition MCU6 calculates the current speed of a motor vehicle and steering wheel angle by the seizure to vehicle speed pulse and corner pulse respectively.The P1.0 of data acquisition MCU6, P1.1 are connected with TXD, the RXD of CAN, form the embedded CAN bus interface of notebook data acquisition system.The P3.0 of data acquisition MCU6, P3.1 are connected with the serial line interface (RS232 or USB) of data handling machine 7 by the MAX232 serial interface chip.
As described in Figure 2, data handling machine 7 comprises subscriber interface module, intermediary's module, database module and data communication module.Be provided with link block, data acquisition module and CAN driver module among the data acquisition MCU6; Data acquisition module be used for to the data acquisition of sensor and with the communication of link block; The data that the CAN driver module is used for described CAN transmitter-receiver 8 send to receive and with the communication of link block; Link block is used for data transmission, the command interpretation work between data acquisition MCU6 and the data handling machine 7.
Carry out data communication by communication protocol between intermediary's module and communication module, database module, the subscriber interface module.Communication protocol comprises object module code, communication port code, traffic category code, communications command code, input and output parameter; The object module code is used to identify the module that communicates with described intermediary module; The communication port code is used to identify the port that communicates with described data acquisition MCU6; The traffic category code is used to identify the type that communicates with described intermediary module; The communications command code is used to identify the order that communicates with described intermediary module.Communication protocol also comprises input and output parameter; Input parameter is used for identification data input data acquisition MCU6; Described output parameter is used for identification data and is exported by data acquisition MCU6.
Fig. 4 is data acquisition screen display interface figure.Send data acquisition command by subscriber interface module to data acquisition MCU6, intermediary's module communicates the agreement package with acquisition, is sent to the data communication module of data handling machine 7 then by RS232 through communication module.Call data acquisition module behind the link block receiving and analyzing of data acquisition MCU6, carry out the data acquisition of main torque sensor 1, assistive torque sensor 2, current sensor 3, vehicle speed sensor 4 and rotary angle transmitter 5.Subscriber interface module sends the Data Receiving order to data acquisition MCU6, and intermediary's module will receive order and communicate the agreement package, be sent to the data communication module of data handling machine 7 then by RS232 through communication module.Behind the link block receiving and analyzing of data acquisition MCU6 institute's image data is sent to the data communication module of data handling machine 7 through link block, after intermediary's module data of data handling machine 7 unpacked, riches all the way delivered to subscriber interface module and shows; Another road sends to database module and stores.
Claims (7)
1. an electric power-assisted steering test stand data collector comprises main torque sensor (1), assistive torque sensor (2), current sensor (3), vehicle speed sensor (4), rotary angle transmitter (5), data acquisition MCU(6) and CAN transmitter-receiver (8); Described main torque sensor (1) and assistive torque sensor (2) respectively with data acquisition MCU(6) embedded A/D ALT-CH alternate channel ADC0, ADC1 be connected; Described current sensor (3) behind sampling resistor with data acquisition MCU(6) embedded A/D ALT-CH alternate channel ADC2 be connected; Described vehicle speed sensor (4) and rotary angle transmitter (5) are connected respectively to data acquisition MCU(6) pulse capture T1, T2 interface; Described data acquisition MCU(6) embedded CAN controller links to each other with described CAN transmitter-receiver (8); Described data acquisition MCU(6) is provided with link block, data acquisition module and CAN driver module in; Described data acquisition module be used for to the data acquisition of sensor and with the communication of link block; The data that described CAN driver module is used for described CAN transmitter-receiver (8) send to receive and with the communication of link block; Described link block is used for data acquisition MCU(6) data transmit, command interpretation work.
2. a kind of electric power-assisted steering test stand data collector according to claim 1, described data acquisition MCU(6) be connected with data handling machine (7) by serial line interface, described data handling machine (7) comprises data communication module, database module, subscriber interface module and intermediary's module; Described intermediary module is used for data communication module, database module, subscriber interface module are coupled together, and carries out data communication by communication protocol.
3. a kind of electric power-assisted steering test stand data collector according to claim 2, described communication protocol comprises object module code, communication port code, traffic category code and communications command code; Described object module code is used to identify the module that communicates with described intermediary module; Described communication port code is used for sign and described data acquisition MCU(6) port that communicates; Described traffic category code is used to identify the type that communicates with described intermediary module; Described communications command code is used to identify the order that communicates with described intermediary module.
4. a kind of electric power-assisted steering test stand data collector according to claim 3, described communication protocol also comprises input and output parameter; Described input parameter is used for identification data input data acquisition MCU(6); Described output parameter is used for identification data by data acquisition MCU(6) output.
5. according to claim 3 or 4 described a kind of electric power-assisted steering test stand data collectors, described communication port code is a serial ports 1 to one of them numeral of serial ports 255.
6. according to claim 3 or 4 described a kind of electric power-assisted steering test stand data collectors, described traffic category code is data code, control routine or security code.
7. an electric power-assisted steering test stand data acquisition network system comprises two and the described data collector of above claim 1, and the CAN transmitter-receiver (8) of described data acquisition links to each other mutually.
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| CN102829984A (en) * | 2012-08-29 | 2012-12-19 | 绍兴文理学院 | Torque tester for automotive steering knuckle |
| CN102984096A (en) * | 2012-10-12 | 2013-03-20 | 中国船舶重工集团公司第七一九研究所 | Assembling method for controller area network (CAN) data frames applied in ship dynamic information acquisition device |
| CN105241678A (en) * | 2015-11-15 | 2016-01-13 | 北京工业大学 | Fast control prototype realization method of active rear wheel steering |
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| CN102829984A (en) * | 2012-08-29 | 2012-12-19 | 绍兴文理学院 | Torque tester for automotive steering knuckle |
| CN102984096A (en) * | 2012-10-12 | 2013-03-20 | 中国船舶重工集团公司第七一九研究所 | Assembling method for controller area network (CAN) data frames applied in ship dynamic information acquisition device |
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| CN105241678A (en) * | 2015-11-15 | 2016-01-13 | 北京工业大学 | Fast control prototype realization method of active rear wheel steering |
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Application publication date: 20111214 |