CN102662394A - Fault simulation device for automobile electric power-assisted steering system - Google Patents
Fault simulation device for automobile electric power-assisted steering system Download PDFInfo
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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 (EUC) 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
Technical field
The present invention relates to a kind of vehicle trouble analogue means, particularly about a kind of automobile electric booster steering system fault 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, replace traditional hydraulic power-assist steering system just gradually in the small and medium-sized car field.EPS mainly is made up 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 the control motor, also than must possessing fault diagnosis functions simultaneously, so that take place when unusual in system; Can make correct response, guarantee traffic safety.Generally verify the fault diagnosis functions of EPS controller now through artificial manufacturing fault in real train test.This research and development mode not only needs the input of human and material resources, and some risk of disturbance is difficult to realize the real vehicle simulation more greatly because of its difficulty.Therefore be necessary to develop a kind of analogue means that can produce fault-signal easily, by this analogue means, checking EPS controller is to the response of various fault-signals, with the fault diagnosis functions of inspection controller.
Summary of the invention
To the problems referred to above, the purpose of this invention is to provide a kind of can be under simulated environment, the various faults that simulation EPS possibly run into, and then the automobile electric booster steering system fault simulation device of the fault diagnosis functions of check EPS controller.
For realizing above-mentioned purpose; The present invention takes following technical scheme: a kind of automobile electric booster steering system fault 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; The fault-signal generation module comprises the single-chip microcomputer that is built-in with the fault-signal simulation softward; The 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 EUC 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 the fault-signal simulation softward generates is exported to torque failure signal output apparatus and the speed of a motor vehicle and engine speed fault-signal output circuit; Torque failure signal output apparatus, the speed of a motor vehicle and engine speed fault-signal output circuit, electrical fault output circuit and the output terminal of controller abnormal voltage output circuit are connected the controller of an automobile electric booster steering system through the EUC interface circuit.
Above-mentioned torque failure signal output apparatus comprises digital to analog converter and operational amplifier, and the digital major and minor moment of torsion fault-signal that single-chip microcomputer is exported converts corresponding simulating signal to, amplifies back output.
The above-mentioned speed of a motor vehicle and engine speed fault-signal output circuit comprise two transistors, and two transistors amplify the two-way square-wave signal power of single-chip microcomputer output respectively, the GES that itself and real vehicle the are produced output of identical back with engine rotational speed signal.
Above-mentioned electrical fault output circuit inserts two relays through the high end interface of motor at automobile electric booster steering system; Insert two relays at the low end interface of motor, and the access one relay formation of on the loop between motor and the high and low end interface of the motor of EPS controller, connect.
Above-mentioned controller abnormal voltage output circuit comprises potentiometer and operational amplifier, through the abnormal voltage signal of user's regulator potentiometer output appointment.
The output terminal of above-mentioned controller abnormal voltage output circuit also connects single-chip microcomputer when the modulus that connects the automobile electric booster steering system controller through the EUC interface circuit is gathered port.
The present invention is owing to take technique scheme; Have the following advantages: 1, the present invention according to the instruction generation various faults signal of user's input, simulates the fault that the EPS system possibly run into owing to adopt the single-chip microcomputer of built-in fault simulation software program; Therefore can be under simulated environment; Carry out the exploitation and the failure response test of EPS controller failure diagnostic routine easily, thereby can reduce cost of development, assess reliability and the security of EPS when running into fault efficiently.2, the present invention can add new circuit as required again owing to adopt the modular design of low coupling in the fault-signal output module, is equipped with the new fault of corresponding SCM program simulation, therefore has stronger expansion capability.The present invention can be widely used in the test and the research and development of automobile electric booster steering system.
Description of drawings
Fig. 1 is a composition synoptic diagram of the present invention
Fig. 2 is a matrix keyboard circuit diagram of the present invention
Fig. 3 is a torque failure signal output apparatus synoptic diagram of the present invention
Fig. 4 is the transistor synoptic diagram of the speed of a motor vehicle of the present invention and engine speed fault-signal output circuit
Fig. 5 is an electrical fault output circuit synoptic diagram of the present invention
Fig. 6 is a controller abnormal voltage output circuit synoptic diagram of the present invention
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is carried out detailed description.
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; The fault-signal generation module comprises that one is built-in with the single-chip microcomputer of fault-signal simulation softward, and the 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 EUC (Electronic Control Unit electronic control unit) interface circuit.
As shown in Figure 1, the user realizes control of the present invention through 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 adopt matrix keyboard.The user is through matrix keyboard button input instruction, and whenever by next button, single-chip microcomputer generates corresponding fault-signal through built-in fault-signal simulator software program.In the present embodiment, matrix keyboard is made up 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 the use, the failure mode quantity that the number of button can be simulated as required and changing.R1～R5 is a pull-up resistor among the figure, and C1～C25 is an electric capacity, and in order to eliminate the level shake in the key contacts closing course, VCC is a power supply.The recognition methods of matrix keyboard button is following:
1. row signal line ROW0～ROW4 all is changed to low level, whether inspection column signal line COL0～COL4 is high level:
If column signal line COL0～COL4 is high level, showing does not have button to press, and returns step 1.;
If among column signal line COL0～COL4 low level is arranged, show that a button is pressed, get into step 2.;
2. row signal line ROW0～ROW4 is changed to low level successively,, when detecting a certain column signal line, confirms that the button of this row signal line and column signal line infall is pressed also for low level when a certain row signal line is a low level.
The result of fault simulation, various voltage of signals and frequency, like the voltage of torque sensor fault-signal, the frequency of the speed of a motor vehicle and engine speed fault-signal, and information such as fault test time and fault test state all can show through display device.
As shown in Figure 1, except connection matrix keyboard and display device, the single-chip microcomputer in the fault-signal generation module also connects the torque failure signal output apparatus in the 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 generates the digital fault signal according to the instruction of user's input through built-in fault simulation software program, exports to the 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 the EPS controller through the EUC interface circuit.The torque failure signal output apparatus is through digital to analog converter and operational amplifier, amplifies after the digital major and minor moment of torsion fault-signal that single-chip microcomputer is generated converts corresponding simulating signal to, exports to the EPS controller.In the present embodiment, single-chip microcomputer is communicated by letter with a pair of way weighted-voltage D/A converter in the torque failure signal output apparatus through its SPI interface and is connected, and the two-way digital to analog converter is the major and minor moment of torsion fault-signal of output synchronously, and fault-signal can be various waveforms.Be 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 2.4 times respectively.
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 the EPS controller through the EUC interface circuit.The speed of a motor vehicle and engine speed fault-signal output circuit make its GES and engine rotational speed signal with the real vehicle generation identical the two-way square-wave signal power amplification that single-chip microcomputer generates, and export to the EPS controller.In the present embodiment, single-chip microcomputer can interrupt generating the square-wave signal of two-way different frequency through its timer internal.Because the voltage range of square-wave signal is 0～5V, and the driving force of single-chip microcomputer pin is limited, so the two-way square-wave signal needs respectively through offering the EPS controller after the transistor amplification.The two transistor structure is identical, is in two transistors shown in Fig. 4, and wherein R11 and R12 are used to be provided with the bias current of transistor, and R13 is a pull-up resistor, and+BB_EPS is the EPS controller power source.
As shown in Figure 5, the electrical fault output circuit comprises a group relay, through the folding simulated machine fault of its contact.The electrical fault output circuit inserts two relay K 2 and K3 through the high end interface of motor at automobile electric booster steering system; Insert two relay K 4 and K5 at the low end interface of motor, and access one relay K 1 formation of on the loop between motor and the high and low end interface of the motor of EPS controller, connect.In the present embodiment,, simulate three kinds of faults through the folding of following K1～K5 contact:
1. closed K2 or K4, the H bridge high side fet of simulated machine is to the 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. break off K1, the simulated machine open circuit fault.
When R21 and R22 are used for the simulated machine fault among the figure, the electric current in the electrical fault output circuit is limited in the safe range.The high and low end interface of the motor of automobile electric booster steering system constitutes the loop through the corresponding high and low end interface of motor that connects the EPS controller of EUC interface circuit.
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 through the user; The abnormal voltage signal of output appointment; This signal is exported to single-chip microcomputer after amplifying through operational amplifier on the one hand, whether meets predetermined requirement for the user through display terminal inspection abnormal voltage signal; Pass to the modulus collection port of EPS controller on the other hand through the EUC interface circuit, gather fault and EPS controller relay contact fault simulation to realize EPS controller modulus.R31 shown in the figure, R32, R33 are resistance, and VCC is a power supply.
As shown in Figure 1, the output terminal of EUC interface circuit connects the EPS controller, when sending fault-signal to the EPS controller, also obtains the power supply support of EPS controller.
In the foregoing description, can also in the fault-signal output module, add new circuit unit, be equipped with corresponding single-chip microcomputer fault-signal simulator software program, to simulate new fault.Above-mentioned each embodiment only is used to explain the present invention, and wherein the structure of each parts, connected mode etc. all can change to some extent, and every equivalents of on the basis of technical scheme of the present invention, carrying out and improvement all should not got rid of outside protection scope of the present invention.
Claims (10)
1. an automobile electric booster steering system fault simulation device comprises human-computer interface module, fault-signal generation module and fault-signal output module, and it is characterized in that: said human-computer interface module comprises matrix keyboard and display device; Said fault-signal generation module comprises the single-chip microcomputer that is built-in with the fault-signal simulation softward; Said 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 EUC interface circuit;
Said matrix keyboard is connected said single-chip microcomputer with said display device;
The output terminal of said single-chip microcomputer connects the input end of said torque failure signal output apparatus and the said speed of a motor vehicle and engine speed fault-signal output circuit, and the fault-signal that said fault-signal simulation softward generates is exported to said torque failure signal output apparatus and the said speed of a motor vehicle and engine speed fault-signal output circuit;
The output terminal of said 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 through said EUC interface circuit.
2. a kind of automobile electric booster steering system fault simulation device as claimed in claim 1; It is characterized in that: said torque failure signal output apparatus comprises digital to analog converter and operational amplifier; Convert the digital major and minor moment of torsion fault-signal of said single-chip microcomputer output to corresponding simulating signal, amplify back output.
3. a kind of automobile electric booster steering system fault simulation device as claimed in claim 1; It is characterized in that: the said speed of a motor vehicle and engine speed fault-signal output circuit comprise two transistors; Two said transistors amplify the two-way square-wave signal power of said single-chip microcomputer output respectively, the GES that itself and real vehicle the are produced output of identical back with engine rotational speed signal.
4. a kind of automobile electric booster steering system fault simulation device as claimed in claim 2; It is characterized in that: the said speed of a motor vehicle and engine speed fault-signal output circuit comprise two transistors; Two said transistors amplify the two-way square-wave signal power of said single-chip microcomputer output respectively, the GES that itself and real vehicle the are produced output of identical back with engine rotational speed signal.
5. like claim 1 or 2 or 3 or 4 described a kind of automobile electric booster steering system fault simulation devices; It is characterized in that: said electrical fault output circuit inserts two relays through the high end interface of motor at said automobile electric booster steering system; Insert two relays at the low end interface of motor, and the access one relay formation of on the loop between said motor and the high and low end interface of the motor of said EPS controller, connect.
6. like claim 1 or 2 or 3 or 4 described a kind of automobile electric booster steering system fault simulation devices; It is characterized in that: said controller abnormal voltage output circuit comprises potentiometer and operational amplifier, regulates the abnormal voltage signal of said potentiometer output appointment through the user.
7. a kind of automobile electric booster steering system fault simulation device as claimed in claim 5; It is characterized in that: said controller abnormal voltage output circuit comprises potentiometer and operational amplifier, regulates the abnormal voltage signal of said potentiometer output appointment through the user.
8. like claim 1 or 2 or 3 or 4 or 7 described a kind of automobile electric booster steering system fault simulation devices; It is characterized in that: the output terminal of said controller abnormal voltage output circuit also connects said single-chip microcomputer when the modulus that connects said automobile electric booster steering system controller through said EUC interface circuit is gathered port.
9. a kind of automobile electric booster steering system fault simulation device as claimed in claim 5; It is characterized in that: the output terminal of said controller abnormal voltage output circuit also connects said single-chip microcomputer when the modulus that connects said automobile electric booster steering system controller through said EUC interface circuit is gathered port.
10. a kind of automobile electric booster steering system fault simulation device as claimed in claim 6; It is characterized in that: the output terminal of said controller abnormal voltage output circuit also connects said single-chip microcomputer when the modulus that connects said automobile electric booster steering system controller through said EUC interface circuit is gathered port.
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| CN103033704A (en) * | 2012-12-11 | 2013-04-10 | 上海汽车集团股份有限公司 | Electric vehicle high-pressure electrical failure dynamic simulation test system and method |
| CN105006182A (en) * | 2015-05-22 | 2015-10-28 | 天津市维科车辆技术有限公司 | Virtual-real fused rail transit vehicle air-conditioning system practical training device and method |
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| CN105094109A (en) * | 2014-05-23 | 2015-11-25 | 上海通用汽车有限公司 | Fault injection device |
| CN105717908A (en) * | 2014-12-05 | 2016-06-29 | 中国航空工业集团公司航空动力控制系统研究所 | Test signal fault simulation device for engine control system stand |
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| CN107436596A (en) * | 2016-05-26 | 2017-12-05 | 上海拿森汽车电子有限公司 | The major-minor MCU redundancies monitoring method of electric boosting steering system |
| CN106527399B (en) * | 2016-11-18 | 2019-10-25 | 武汉理工大学 | SCM Based automobile electric control system fault injection system |
| CN106527399A (en) * | 2016-11-18 | 2017-03-22 | 武汉理工大学 | Automobile electric control system fault injection system based on single chip microcomputer |
| CN106774263A (en) * | 2016-12-28 | 2017-05-31 | 海特汽车科技（苏州）有限公司 | A kind of EPS controller tests system and device |
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