CN202351626U - Analog collision signal generating device developed for automobile SRS control system - Google Patents
Analog collision signal generating device developed for automobile SRS control system Download PDFInfo
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- CN202351626U CN202351626U CN2011204663157U CN201120466315U CN202351626U CN 202351626 U CN202351626 U CN 202351626U CN 2011204663157 U CN2011204663157 U CN 2011204663157U CN 201120466315 U CN201120466315 U CN 201120466315U CN 202351626 U CN202351626 U CN 202351626U
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- air bag
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Abstract
An analog collision signal generating device developed for an automobile SRS (Supplemental Restraint System) control system comprises more than two analog acceleration sensors, wherein each analog acceleration sensor comprises a processor chip, a power interface and control switch, a power switching circuit, a download circuit, an operational amplification circuit, a synchronous circuit, a fault analog circuit and an output interface; the power interface and control switches are externally connected with a power supply through power cords; the output interfaces are connected with an SRS control device through flat cables; the synchronous circuits are used for enabling the more than two analog acceleration sensors to work synchronously; and the download circuits are used for downloading different collision waveforms from an upper computer to the processor chips and achieving analog output of the collision waveforms through the processor chips. The analog collision signal generating device has the advantages that the operation is simple and convenient, various automobile collision environments can be simulated according to different requirements, and SRS test and development are facilitated.
Description
Technical field
The utility model is mainly concerned with the safe automobile air bag field, refers in particular to a kind of simulated crash signal generation apparatus that is applicable to the safe automobile air bag exploitation.
Background technology
When automobile bumps; Collision between car body and the external object is called primary collision; Car speed sharply changes behind the primary collision, and driver and occupant bump with members such as steering wheel, front windshield or instrument desk in the car because inertia moves forward.This collision is called secondary collision.Big quantity research shows that secondary collision is the main reason that causes driver and occupant in car accident, to sustain an injury.Air bag (airbag) is that (supplemental restraint system, important component part SRS) has become the auto-producing standard configuration in automobile passenger auxiliary protection system as a kind of passive safety feature.The effect of control system of safety air bag is: when automobile suffered collision to cause the speed of a motor vehicle sharply to change, sensor was transferred to the air bag controlled system with the collision alarm that perceives.The information of a plurality of sensors of control system synthesis is differentiated collision situation, and whether decision sends ignition signal.In a single day ignition signal sends, and gas generator will produce a large amount of gas in official hour, rapidly air bag is expanded rapid air cushion of place mat between occupant and car inner member.Like this, what human body directly contacted is exactly gassiness air bag, utilizes the damping action of air bag to absorb the kinetic energy that inertia produces, thereby alleviates human injury's degree.How in the blink that collision takes place, accurately and timely opening air bag, realize the safeguard protection to driver and passenger, is the main contents of air bag development.
In order to realize the accurately control in real time of air bag, in the algorithm development process of air bag, need carry out a large amount of collision experiments.Through experiment test and contrast repeatedly, analyze the best electric parameter of air bag IGNITION CONTROL, check the stability of air bag under the various collision situations, carry out control algolithm adjustment and algorithm reliability demonstration.Yet the actual collision experimental expenses is high, if in the system debug process, rely on actual collision to adjust control algolithm fully, cost of development will be difficult to accept.And each full scale vehicle collision all needs special test environment, needs a large amount of preliminary work, has improved the threshold of algorithm debugging, incurs loss through delay the experiment process.In addition, carrying out actual collision test, to be difficult to analog sensor fault etc. unusual, thereby be difficult to test the treatment effect of control algolithm to abnormal conditions.Therefore, in safe automobile air bag control system performance history, need to seek a kind of simple and feasible method and come the simulated automotive collision situation, realize the rapid adjustment of control algolithm.Commonly used at present is the method that adopts waveform generator, simulates the actual collision waveform through waveform generator.But problems such as the method that adopts waveform generator exists, and cost is high, volume is big, inconvenient operation.And the port number that each waveform generator had is limited; And a plurality of crash sensors has been installed all on the present many medium-to-high grade automobile; When adopting waveform generator to simulate, can cause system's line complicated, be difficult to problems such as synchronous between a plurality of simulating signals.
The utility model content
The technical matters that the utility model will solve just is: to the technical matters that prior art exists, the utility model provide a kind of easy and simple to handle, can go out various car crass environment according to different requirement simulation, be convenient to the simulated crash signal generation apparatus towards the exploitation of safe automobile air bag control system of air bag test development.
For solving the problems of the technologies described above, the utility model adopts following technical scheme:
A kind of simulated crash signal generation apparatus towards the exploitation of safe automobile air bag control system; Comprise plural analog acceleration sensor; The analog acceleration sensor comprises processor chips, power interface and CS, power-switching circuit, download circuit, operational amplification circuit, synchronizing circuit, fault simulation circuit and output interface; Power interface and CS are through the power lead external power supply; Output interface links to each other with the control device of air bag through winding displacement; Synchronizing circuit is used for making two above analog acceleration sensors when work, to realize that download circuit is used for downloading different collision waveform to processor chips and through processor chips collision waveform being simulated output from host computer synchronously.
Further improvement as the utility model:
The fault simulation circuit is to deliver to processor chips through the fault pumping signal of the outside input of on-off circuit collection, and processor chips simulate pairing sensor fault phenomenon after this signal is discerned judgement.
Compared with prior art, the advantage of the utility model is:
(1) the utility model can satisfy the various testing requirements in the safe automobile air bag performance history.Assist to adjust controlled variable owing to need a large amount of collision experiments in the safe automobile air bag design process; To the collision demand in the air bag performance history; The utility model design simulation acceleration transducer hardware system; Then the actual collision curve is changed, through adjusting parameters such as its time, amplitude, the output acceleration signal consistent on the analog acceleration sensor with impact curve; At last a plurality of analog acceleration sensors are carried out time synchronized, add fault simulation, to realize the simulative automobile crash device.
(2) the utility model can be analyzed true impact curve; Make and monitor the feedback collision information between the different collision informations synchronously and in real time; And have convenient, the characteristics such as extensibility is strong, flexibility ratio height of structure, can satisfy various simulated crash demands in the safe automobile air bag performance history well.
Description of drawings
Fig. 1 is the framed structure synoptic diagram of the utility model;
Fig. 2 is the principle schematic of operational amplification circuit in the specific embodiment;
Fig. 3 is the principle schematic of analog acceleration signal circuit in the specific embodiment;
Fig. 4 is the workflow synoptic diagram of the utility model in concrete application example;
Fig. 5 is the structural representation of the utility model in concrete application example.
Marginal data:
1, analog acceleration sensor; 2, processor chips; 3, power interface and CS; 4, power-switching circuit; 5, download circuit; 6, operational amplification circuit; 7, synchronizing circuit; 8, fault simulation circuit; 9, output interface.
Embodiment
Below will combine Figure of description and specific embodiment that the utility model is explained further details.
As shown in Figure 1; The utility model is towards the simulated crash signal generation apparatus of safe automobile air bag exploitation; Comprise plural analog acceleration sensor 1, this analog acceleration sensor 1 comprises processor chips 2, power interface and CS 3, power-switching circuit 4, download circuit 5, operational amplification circuit 6, synchronizing circuit 7, fault simulation circuit 8 and output interface 9.Wherein, power interface and CS 3 are through the power lead external power supply, and output interface 9 links to each other with the control device of air bag through winding displacement.
In the present embodiment, processor chips 2 adopt the C8051F330 chip, and operational amplification circuit 6 adopts the LM324 chip, and fault simulation circuit 8 is gathered the fault pumping signal of outside input through on-off circuit.
The C8051F330 chip; The computing velocity of its 25MIPS has satisfied the real-time demand of installing various calculating; The accuracy requirement of acceleration transducer signals has been satisfied in 10 DAC output in the DA conversion; The FLASH that the system of 8KB carries in the storage unit can storage control program and impact curve data, and programmable counter is convenient to realize the system synchronization between each analog sensor, and 17 universal input and output port that possessed have satisfied system's general controls demand signals fully.Because the WV of true acceleration transducer is 5V, and the WV of C8051F330 is 3.3V.In order to guarantee that analog acceleration sensor 1 and true acceleration transducer are consistent on voltage, need be amplified to 5V from 3.3V to the output signal of processor chips 2, therefore select for use the LM324 chip to realize the amplification of signal as operational amplification circuit 6.LM324 is a four high guaily unit integrated circuit, and inside comprises four groups of operational amplifiers that form is identical but separate.Wherein one tunnel connection is as shown in Figure 2.
For the output of analog acceleration signal, device needs to adopt independent processing mode that it is amplified.The digital/analog converter that processor chips 2 have is the current work mode, also promptly adopts different electric currents to represent different numerical, and real acceleration transducer is to distinguish different numerical through the different voltages with different value.Therefore when circuit design, just need to add the conversion of electric current to voltage.Because the WV of chip is 3.3V, the maximum output voltage of its each pin can not be higher than 3.3V.The scheme that the utility model adopted is at first to convert electric current output into peak value lower voltage output, then it is carried out processing and amplifying, thereby obtains final analog acceleration output.The circuit of analog acceleration signal is as shown in Figure 3.
The utility model through increase on the analog acceleration sensor 1 synchronizing signal realize between a plurality of sensors synchronously.The synchronizing signal of different analog sensors is connected together, be connected to the synchronous port of external airbag control chip jointly.Like this, when the air bag controlled system sent synchronizing signal, each analog sensor can be received this signal simultaneously, again through software design realize between the analogue means synchronously.
Existing acceleration transducer has self-checking function usually, can in time detect unusual that sensor takes place, and comprises problems such as sensor failure, fault.But abnormal conditions are difficult to occur in the real sensor test process, also just can't test the reaction of air bag controlled system for abnormal conditions well.To this problem, the analog acceleration sensor of the utility model design is provided with fault simulating function.Gather the outside fault pumping signal of importing through on-off circuit, processor is discerned judgement to this signal, simulates pairing sensor fault phenomenon then.
The overall process of the software design of the utility model is, at first analyzes the accelerating curve characteristic, and being translated into SCM program can recognition data; Next carries out software programming, and data and control program after the conversion are carried out compilation and synthesis; Through emulator program is downloaded debugging at last, accomplish software design procedure.The data flow of software design is as shown in Figure 4.
As shown in Figure 5, in concrete application example, adopt four analog acceleration sensors 1, as the true acceleration transducer of left front on the simulated automotive, right front, left side, four positions, right side, constitute a simulated crash device respectively; Link to each other with control system of safety air bag then and carry out the simulative automobile crash tests, write host computer procedure each simulation output is detected, catch the output of four tunnel simulated crash.Implementation step is following:
At first, will speed up degrees of data through host computer and download circuit 5 and download to analog acceleration sensor 1, adjust parameters such as signal amplitude, triggered time, signal period, make each analog acceleration sensor 1 all can simulate different data.After four analog acceleration sensors 1 are all downloaded and finished, be connected on the interface of each analog acceleration sensor 1 on the air bag main control board, the synchronous signal line of each analog acceleration sensor 1 has also been accomplished connection simultaneously.Whether normal for detecting 1 work of analog acceleration sensor, can also be further at the output termination oscillograph of each analog acceleration sensor 1, whether observe the acceleration signal waveform consistent with the acceleration information of downloading.
After all are ready; Open the power switch of each analog acceleration sensor 1, start the air bag main control board then, can see that the test signal lamp on each analog acceleration sensor 1 is glimmering; The indication device self check is normal; Press " collision takes place " button on arbitrary analog acceleration sensor 1, each analog acceleration sensor 1 at first can carry out synchronously through synchronizing circuit 7, then output crash acceleration signal separately; Output signal light on the analog acceleration sensor is lighted; Acceleration signal is being exported in expression, and the air bag controlled system exports the internal operation situation of system through the CAN bus, thereby can realize each road simulation output is monitored through the watchdog routine of host computer.The comparison of wave shape analysis of catching through waveform that each acceleration transducer is simulated and host computer can draw; The collaborative work well of simulated crash device; Each analog sensor is in proper working order, and correctly the simulated automotive collision situation has been realized systemic-function.
Below only be the preferred implementation of the utility model, the protection domain of the utility model also not only is confined to the foregoing description, and all technical schemes that belongs under the utility model thinking all belong to the protection domain of the utility model.Should be pointed out that for those skilled in the art,, should be regarded as the protection domain of the utility model in the some improvement and the retouching that do not break away under the utility model principle prerequisite.
Claims (2)
1. simulated crash signal generation apparatus towards safe automobile air bag control system exploitation; It is characterized in that: comprise plural analog acceleration sensor (1); Said analog acceleration sensor (1) comprises processor chips (2), power interface and CS (3), power-switching circuit (4), download circuit (5), operational amplification circuit (6), synchronizing circuit (7), fault simulation circuit (8) and output interface (9); Said power interface and CS (3) are through the power lead external power supply; Output interface (9) links to each other with the control device of air bag through winding displacement; Said synchronizing circuit (7) is used for making two above analog acceleration sensors (1) when work, to realize synchronously, and said download circuit (5) is used for downloading different collision waveform to processor chips (2) and through processor chips (2) collision waveform being simulated output from host computer.
2. according to the simulated crash signal generation apparatus towards safe automobile air bag control system exploitation of claim 1; It is characterized in that: said fault simulation circuit (8) is to deliver to processor chips (2) through the fault pumping signal of the outside input of on-off circuit collection, and said processor chips (2) simulate pairing sensor fault phenomenon after this signal is discerned judgement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204663157U CN202351626U (en) | 2011-11-22 | 2011-11-22 | Analog collision signal generating device developed for automobile SRS control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011204663157U CN202351626U (en) | 2011-11-22 | 2011-11-22 | Analog collision signal generating device developed for automobile SRS control system |
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| CN202351626U true CN202351626U (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2011204663157U Expired - Fee Related CN202351626U (en) | 2011-11-22 | 2011-11-22 | Analog collision signal generating device developed for automobile SRS control system |
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| CN (1) | CN202351626U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111581731A (en) * | 2020-05-18 | 2020-08-25 | 上海麦腾物联网技术有限公司 | Control method and system for SRSSignalDetect software test input source |
| CN114942601A (en) * | 2022-05-26 | 2022-08-26 | 中国第一汽车股份有限公司 | Simulation test equipment and method for airbag electronic control system |
-
2011
- 2011-11-22 CN CN2011204663157U patent/CN202351626U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111581731A (en) * | 2020-05-18 | 2020-08-25 | 上海麦腾物联网技术有限公司 | Control method and system for SRSSignalDetect software test input source |
| CN114942601A (en) * | 2022-05-26 | 2022-08-26 | 中国第一汽车股份有限公司 | Simulation test equipment and method for airbag electronic control system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120725 Termination date: 20141122 |
|
| EXPY | Termination of patent right or utility model |