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CN102662394B - Fault simulation device for automobile electric power steering system - Google Patents

Fault simulation device for automobile electric power steering system Download PDF

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Publication number
CN102662394B
CN102662394B CN201210141032.4A CN201210141032A CN102662394B CN 102662394 B CN102662394 B CN 102662394B CN 201210141032 A CN201210141032 A CN 201210141032A CN 102662394 B CN102662394 B CN 102662394B
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China
Prior art keywords
fault
signal
steering system
output circuit
automobile electric
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Expired - Fee Related
Application number
CN201210141032.4A
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Chinese (zh)
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CN102662394A (en
Inventor
季学武
朱尽崎
刘亚辉
姜殿鑫
吕荣华
吴远远
卢琼波
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Tsinghua University
Jingzhou Henglong Automotive Parts Co Ltd
Wuhan Jielong Electric Power Steering Co Ltd
Original Assignee
Tsinghua University
Jingzhou Henglong Automotive Parts Co Ltd
Wuhan Jielong Electric Power Steering Co Ltd
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Application filed by Tsinghua University, Jingzhou Henglong Automotive Parts Co Ltd, Wuhan Jielong Electric Power Steering Co Ltd filed Critical Tsinghua University
Priority to CN201210141032.4A priority Critical patent/CN102662394B/en
Publication of CN102662394A publication Critical patent/CN102662394A/en
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Abstract

The invention discloses a fault simulation device for an automobile electric power-assisted steering system. The fault simulation device comprises a human-machine interface module, a fault signal generation module and a fault signal output module, wherein the human-machine interface module comprises a matrix keyboard and display equipment; the fault signal generation module comprises a singlechip with built-in fault signal simulation software; the fault signal output module comprises a torque fault signal output circuit, an automobile speed and engine rotating speed fault signal output circuit, a motor fault signal output circuit and a controller abnormal voltage output circuit; fault signals generated by the singlechip through the software are respectively amplified or opening and closing operation of a relay contact is finished, so that various faults possibly met by the automobile electric power-assisted steering system (EPS) can be simulated; and corresponding results are output to an EPS controller through an equipment under control (ECU) interface circuit. The fault simulation device can be used for simulating various faults possibly met by the EPS, developing a fault diagnosis procedure of the EPS controller and performing fault response test, so that the reliability and the safety of the EPS when the EPS meets the fault can be evaluated.

Description

A kind of automobile electric booster steering system failure simulation device
Technical field
The present invention relates to a kind of vehicle trouble analogue means, particularly about a kind of automobile electric booster steering system failure simulation device.
Background technology
For traditional hydraulic power-assist steering system, automobile electric booster steering system (EPS) relies on motor that power-assisted is provided, have assist characteristic variable, save the energy and advantages of simple structure and simple, in small and medium-sized car field, replace just gradually traditional hydraulic power-assist steering system.EPS mainly consists of controller, torque sensor, motor, speed reduction unit, mechanical steering system etc.Control device as motor turning, the controller of automobile electric booster steering system (EPS controller) provides the function of power steering except controlling motor, also than must possess fault diagnosis functions simultaneously, to occur when abnormal in system, can make correct response, guarantee traffic safety.Generally by artificial manufacturing fault in real train test, verify now the fault diagnosis functions of EPS controller.This R&D Approach not only needs the input of human and material resources, and some risk of disturbance is simulated because its difficulty is difficult to more greatly realize real vehicle.Therefore be necessary to develop a kind of analogue means that can produce easily fault-signal, by this analogue means, the response of checking EPS controller to various fault-signals, to check the fault diagnosis functions of controller.
Summary of the invention
For the problems referred to above, the object of this invention is to provide a kind of can be under simulated environment, the various faults that simulation EPS may run into, and then the automobile electric booster steering system failure simulation device of the fault diagnosis functions of check EPS controller.
For achieving the above object, the present invention takes following technical scheme: a kind of automobile electric booster steering system failure simulation device, comprise human-computer interface module, fault-signal generation module and fault-signal output module, it is characterized in that: human-computer interface module comprises matrix keyboard and display device; Fault-signal generation module comprises the single-chip microcomputer that is built-in with fault-signal simulation softward; Fault-signal output module comprises torque failure signal output apparatus, the speed of a motor vehicle and engine speed fault-signal output circuit, electrical fault output circuit, controller abnormal voltage output circuit and ECU interface circuit; Matrix keyboard is connected single-chip microcomputer with display device; The output terminal of single-chip microcomputer connects the input end of torque failure signal output apparatus and the speed of a motor vehicle and engine speed fault-signal output circuit, and the fault-signal that fault-signal simulation softward is generated is exported to torque failure signal output apparatus and the speed of a motor vehicle and engine speed fault-signal output circuit; The output terminal of torque failure signal output apparatus, the speed of a motor vehicle and engine speed fault-signal output circuit, electrical fault output circuit and controller abnormal voltage output circuit is connected the controller of an automobile electric booster steering system by ECU interface circuit.
Above-mentioned torque failure signal output apparatus comprises digital to analog converter and operational amplifier, converts the major and minor moment of torsion fault-signal of numeral of single-chip microcomputer output to corresponding simulating signal, output after amplifying.
The above-mentioned speed of a motor vehicle and engine speed fault-signal output circuit comprise two transistors, and two transistors amplify respectively the two-way square-wave signal power of single-chip microcomputer output, the vehicle speed signal rear output identical with engine rotational speed signal that it is produced with real vehicle.
Above-mentioned electrical fault output circuit accesses two relays by the high end interface of the motor at automobile electric booster steering system, at the low end interface of motor, access two relays, and access one relay of connecting forms on the loop between the high and low end interface of motor of motor and EPS controller.
Above-mentioned controller abnormal voltage output circuit comprises potentiometer and operational amplifier, by the abnormal voltage signal of user's regulator potentiometer output appointment.
The output terminal of above-mentioned controller abnormal voltage output circuit, when the modulus that connects automobile electric booster steering system controller by ECU interface circuit gathers port, also connects single-chip microcomputer.
The present invention is owing to taking technique scheme, have the following advantages: 1, the present invention is owing to adopting the single-chip microcomputer of built-in fault simulation software program, according to the instruction of user's input, produce various faults signal, the fault that simulation EPS system may run into, therefore can be under simulated environment, carry out easily exploitation and the failure response test of EPS controller failure diagnostic routine, thereby can reduce cost of development, assess efficiently reliability and the security of EPS when running into fault.2, the present invention, owing to adopting the modular design of low coupling, can add new circuit as required again in fault-signal output module, is equipped with corresponding Single Chip Microcomputer (SCM) program and simulates new fault, therefore has stronger expansion capability.The present invention can be widely used in test and the research and development of automobile electric booster steering system.
Accompanying drawing explanation
Fig. 1 is composition schematic diagram of the present invention
Fig. 2 is matrix keyboard circuit schematic diagram of the present invention
Fig. 3 is torque failure signal output apparatus schematic diagram of the present invention
Fig. 4 is the transistor schematic diagram of the speed of a motor vehicle of the present invention and engine speed fault-signal output circuit
Fig. 5 is electrical fault output circuit schematic diagram of the present invention
Fig. 6 is controller abnormal voltage output circuit schematic diagram of the present invention
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1, the present invention includes a human-computer interface module, a fault-signal generation module and a fault-signal output module.Human-computer interface module comprises matrix keyboard and display device, fault-signal generation module comprises that one is built-in with the single-chip microcomputer of fault-signal simulation softward, and fault-signal output module comprises a torque failure signal output apparatus, a speed of a motor vehicle and engine speed fault-signal output circuit, an electrical fault output circuit, a controller abnormal voltage output circuit and an ECU (Electronic Control Unit electronic control unit) interface circuit.
As shown in Figure 1, user realizes control of the present invention by human-computer interface module.The matrix keyboard of human-computer interface module is connected with the port of fault-signal generation module single-chip microcomputer respectively with display device.Because simulated failure kind of the present invention is more, and the number of pin of single-chip microcomputer is limited, therefore adopts matrix keyboard.User is by the instruction of matrix keyboard key-press input, and often by next button, single-chip microcomputer, by built-in fault-signal simulator software program, generates corresponding fault-signal.In the present embodiment, matrix keyboard consists of 25 button SW1~SW25 of 5 row 5 row, corresponding to 10 pins (as shown in Figure 2) of single-chip microcomputer, and during actual use, the failure mode quantity that the number of button can be simulated as required and changing.In figure, R1~R5 is pull-up resistor, and C1~C25 is electric capacity, and in order to eliminate the level shake in key contacts closing course, VCC is power supply.The recognition methods of matrix keyboard button is as follows:
1. row signal line ROW0~ROW4 is all set to low level, checks whether column signal line COL0~COL4 is high level:
If column signal line COL0~COL4 is high level, show not have button to press, return to step 1.;
If have low level in column signal line COL0~COL4, show that a button is pressed, enter step 2.;
2. row signal line ROW0~ROW4 is set to low level successively, when a certain row signal line is low level, while a certain column signal line being detected also for low level, determines that the button of this row signal line and column signal line infall is pressed.
The result of fault simulation, the voltage of various signals and frequency, as the voltage of torque sensor fault-signal, the frequency of the speed of a motor vehicle and engine speed fault-signal, and the information such as fault test time and fault test state all can show by display device.
As shown in Figure 1, except connection matrix keyboard and display device, the single-chip microcomputer in fault-signal generation module also connects the torque failure signal output apparatus in fault-signal output module, and the input end of the speed of a motor vehicle and engine speed fault-signal output circuit.Single-chip microcomputer, according to the instruction of user's input, by built-in fault simulation software program generating digital fault-signal, is exported to torque failure signal output apparatus, and the speed of a motor vehicle and engine speed fault-signal output circuit.
As shown in Figure 3, the input end of torque failure signal output apparatus connects single-chip microcomputer, and output terminal connects EPS controller by ECU interface circuit.Torque failure signal output apparatus, by digital to analog converter and operational amplifier, amplifies after the major and minor moment of torsion fault-signal of numeral that single-chip microcomputer is generated converts corresponding simulating signal to, exports to EPS controller.In the present embodiment, single-chip microcomputer communicates to connect by a pair of way weighted-voltage D/A converter in its SPI interface and torque failure signal output apparatus, the major and minor moment of torsion fault-signal of the synchronous output of two-way digital to analog converter, and fault-signal can be various waveforms.For the power supply short circuit fault of simulation torque sensor, the maximal value of this two-way fault-signal should reach the supply voltage of accumulator.Because the output voltage of digital to analog converter is up to 5V, therefore, when the supply voltage of accumulator is 12V, need to adopt two in-phase proportion operational amplifiers that two output signals of two-way digital to analog converter are amplified respectively to 2.4 times.
As shown in Figure 4, two input ends of the speed of a motor vehicle and engine speed fault-signal output circuit are connected single-chip microcomputer, and two output terminals connect EPS controller by ECU interface circuit.The two-way square-wave signal power amplification that the speed of a motor vehicle and engine speed fault-signal output circuit generate single-chip microcomputer, makes it identical with vehicle speed signal and engine rotational speed signal that real vehicle produces, exports to EPS controller.In the present embodiment, single-chip microcomputer can interrupt generating by its timer internal the square-wave signal of two-way different frequency.Because the voltage range of square-wave signal is 0~5V, and the driving force of single-chip microcomputer pin is limited, so two-way square-wave signal needs each after a transistor amplifies, offer EPS controller.Two transistor structure is identical, is in two transistors shown in Fig. 4, and wherein R11 and R12 are for arranging the bias current of transistor, and R13 is pull-up resistor, and+BB_EPS is EPS controller power source.
As shown in Figure 5, electrical fault output circuit comprises a group relay, by the folding simulated machine fault of its contact.Electrical fault output circuit accesses two relay K 2 and K3 by the high end interface of the motor at automobile electric booster steering system, at the low end interface of motor, access two relay K 4 and K5, and access one relay K 1 of connecting forms on the loop between the high and low end interface of motor of motor and EPS controller.In the present embodiment, by the folding of following K1~K5 contact, simulate three kinds of faults:
1. closed K2 or K4, the H bridge high side fet of simulated machine is to power supply short circuit fault;
2. closed K2 and K3 or closed K4 and K5, the H bridge low side fet shorted to earth fault of simulated machine;
3. disconnect K1, simulated machine open circuit fault.
In figure, R21 and R22 be when the simulated machine fault, by the current limit in electrical fault output circuit in safe range.The high and low end interface of the motor of automobile electric booster steering system, by the corresponding high and low end interface of motor that connects EPS controller of ECU interface circuit, forms loop.
As shown in Figure 6, controller abnormal voltage output circuit comprises potentiometer and operational amplifier.Controller abnormal voltage output circuit is adjusted the resistance of potentiometer by user, the abnormal voltage signal of output appointment, after this signal amplifies by operational amplifier, export on the one hand single-chip microcomputer, for user, by display terminal, check whether abnormal voltage signal meets pre-provisioning request, by ECU interface circuit, pass on the other hand the modulus collection port of EPS controller, to realize EPS controller modulus, gather fault and EPS controller relay contact fault simulation.R31 shown in figure, R32, R33 are resistance, and VCC is power supply.
As shown in Figure 1, the output terminal of ECU interface circuit connects EPS controller, when sending fault-signal to EPS controller, also obtains the power supply support of EPS controller.
In above-described embodiment, can also in fault-signal output module, add new circuit unit, be equipped with corresponding single-chip microcomputer fault-signal simulator software program, to simulate new fault.The various embodiments described above are only for illustrating the present invention, and wherein the structure of each parts, connected mode etc. all can change to some extent, and every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.

Claims (10)

1. an automobile electric booster steering system failure simulation device, is characterized in that: it comprises human-computer interface module, fault-signal generation module and fault-signal output module, and described human-computer interface module comprises matrix keyboard and display device; Described fault-signal generation module comprises the single-chip microcomputer that is built-in with fault-signal simulation softward; Described fault-signal output module comprises torque failure signal output apparatus, the speed of a motor vehicle and engine speed fault-signal output circuit, electrical fault output circuit, controller abnormal voltage output circuit and ECU interface circuit;
Described matrix keyboard is connected described single-chip microcomputer with described display device;
The output terminal of described single-chip microcomputer connects the input end of described torque failure signal output apparatus and the described speed of a motor vehicle and engine speed fault-signal output circuit, and the fault-signal that described fault-signal simulation softward is generated is exported to described torque failure signal output apparatus and the described speed of a motor vehicle and engine speed fault-signal output circuit;
The output terminal of described torque failure signal output apparatus, the speed of a motor vehicle and engine speed fault-signal output circuit, electrical fault output circuit and controller abnormal voltage output circuit is connected the controller of an automobile electric booster steering system by described ECU interface circuit.
2. a kind of automobile electric booster steering system failure simulation device as claimed in claim 1, it is characterized in that: described torque failure signal output apparatus comprises digital to analog converter and operational amplifier, convert the major and minor moment of torsion fault-signal of numeral of described single-chip microcomputer output to corresponding simulating signal, output after amplifying.
3. a kind of automobile electric booster steering system failure simulation device as claimed in claim 1, it is characterized in that: the described speed of a motor vehicle and engine speed fault-signal output circuit comprise two transistors, described in two, transistor amplifies respectively the two-way square-wave signal power of described single-chip microcomputer output, the vehicle speed signal rear output identical with engine rotational speed signal that it is produced with real vehicle.
4. a kind of automobile electric booster steering system failure simulation device as claimed in claim 2, it is characterized in that: the described speed of a motor vehicle and engine speed fault-signal output circuit comprise two transistors, described in two, transistor amplifies respectively the two-way square-wave signal power of described single-chip microcomputer output, the vehicle speed signal rear output identical with engine rotational speed signal that it is produced with real vehicle.
5. a kind of automobile electric booster steering system failure simulation device as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: described electrical fault output circuit accesses two relays by the high end interface of the motor at described automobile electric booster steering system, at the low end interface of motor, access two relays, and access one relay of connecting forms on the loop between the high and low end interface of motor of described motor and described EPS controller.
6. a kind of automobile electric booster steering system failure simulation device as claimed in claim 1 or 2 or 3 or 4, it is characterized in that: described controller abnormal voltage output circuit comprises potentiometer and operational amplifier, by user, regulate the abnormal voltage signal of described potentiometer output appointment.
7. a kind of automobile electric booster steering system failure simulation device as claimed in claim 5, it is characterized in that: described controller abnormal voltage output circuit comprises potentiometer and operational amplifier, by user, regulate the abnormal voltage signal of described potentiometer output appointment.
8. a kind of automobile electric booster steering system failure simulation device as described in claim 1 or 2 or 3 or 4 or 7, it is characterized in that: the output terminal of described controller abnormal voltage output circuit, when the modulus that connects described automobile electric booster steering system controller by described ECU interface circuit gathers port, also connects described single-chip microcomputer.
9. a kind of automobile electric booster steering system failure simulation device as claimed in claim 5, it is characterized in that: the output terminal of described controller abnormal voltage output circuit, when the modulus that connects described automobile electric booster steering system controller by described ECU interface circuit gathers port, also connects described single-chip microcomputer.
10. a kind of automobile electric booster steering system failure simulation device as claimed in claim 6, it is characterized in that: the output terminal of described controller abnormal voltage output circuit, when the modulus that connects described automobile electric booster steering system controller by described ECU interface circuit gathers port, also connects described single-chip microcomputer.
CN201210141032.4A 2012-05-08 2012-05-08 Fault simulation device for automobile electric power steering system Expired - Fee Related CN102662394B (en)

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