CN202974671U - A signal generating circuit used for detecting a vehicle system - Google Patents
A signal generating circuit used for detecting a vehicle system Download PDFInfo
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- CN202974671U CN202974671U CN 201220602111 CN201220602111U CN202974671U CN 202974671 U CN202974671 U CN 202974671U CN 201220602111 CN201220602111 CN 201220602111 CN 201220602111 U CN201220602111 U CN 201220602111U CN 202974671 U CN202974671 U CN 202974671U
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Abstract
The utility mode provides a signal generating circuit used for detecting a vehicle system and belongs to the field of automotive electronic technology. The signal generating circuit resolves problem of high loss rate in a sensor used for detecting a vehicle system and low system fault detecting speed in a product in the prior art. The circuit comprises a single chip microcomputer (SCM) which is connected with a power supply module. The power supply module converts commercial power into DC and supplies power to the vehicle system required to be detected and the SCM. The input port of the SCM is connected with a crystal oscillator circuit which is used for transmitting clock signals to control the work cycle of the SCM. The SCM comprises a timer and a plurality of I/O interfaces. The timer controls the output pulse signal frequency of the SCM by timing and counting the work cycle of the SCM. The plurality of I/O interfaces are used for being connected with the vehicle system. The SCM receives and processes the signals which are transmitted from the crystal oscillator circuit and timer and outputs pulse signals with different frequencies via the I/O interfaces. The circuit achieves fault detection just by generating signals to output to the vehicle system and has fast detecting speed.
Description
Technical field
The utility model belongs to technical field of automotive electronics, relates to a kind of signal generating circuit that detects Vehicular system.
Background technology
Along with socioeconomic development, the recoverable amount of automobile increases day by day, and automobile has become the main traffic instrument of people's trip gradually, and meanwhile auto manufacturing and automobile maintenance industry have obtained development energetically.Automobile has a lot of Vehicular systems and comprises pressure of vehicle system, engine system, oil consumption system etc., need to carry out Performance Detection to these systems before dispatching from the factory, and whether investigation automobile each system has fault and carry out the software systems debugging.Equally, when automobile keeps in repair, also need Vehicular system is detected.
At present, Vehicular system is detected the relevant sensor of general employing, by the related data of sensor acquisition system, and read by host computer, judge whether system has fault.
Disclosing application number as Chinese patent literature is 201020236678.7 automobile pressure system analyser, and comprising: one detects main frame, and it comprises single-chip microcomputer, power module, load module, output module, storer and printer; One pressure acquisition device, comprise pressure transducer, the A/D change-over circuit, rapid-acting coupling and automobile pressure special joint, pressure transducer one end is connected with the A/D change-over circuit, and the other end is connected with rapid-acting coupling by screw thread, A/D change-over circuit one end is connected with pressure transducer, the other end is connected with the single-chip microcomputer that detects main frame by cable, and described cable is comprised of ground wire, signal wire and power lead, and the automobile pressure special joint is comprised of the detection tabs of each pressure system of automobile.Above-mentioned patent detects each pressure system of automobile by the utilization pressure transducer, and shows by Single-chip Controlling.The utilization sensor carries out the proportion of goods damageds of the detecting sensor of Vehicular system high, and the price high discovery detection system fault speed of sensor is slower, and practicality is not high.Sensor detecting system is pointed, can only detected pressures as pressure transducer, and the scope of application is wideless.
Summary of the invention
There are the problems referred to above in the utility model for existing technology, has proposed a kind of signal generating circuit that detects Vehicular system, and this circuit only needs to export to Vehicular system by the generation signal and realizes fault detect, and can be suitable for a plurality of Vehicular systems.
the utility model is realized by following technical proposal: a kind of signal generating circuit that detects Vehicular system, it is characterized in that, this circuit comprises single-chip microcomputer, described single-chip microcomputer is connected with the power module that civil power is changed into direct current and the Vehicular system that give to need detects and single-chip microcomputer power supply, the input port of described single-chip microcomputer is connected with for the tranmitting data register signal controlling crystal oscillating circuit of single-chip microcomputer work period, described single-chip microcomputer includes by the timer to single-chip microcomputer work period time and count control single-chip microcomputer output pulse signal frequency, described single-chip microcomputer also comprises be used to the some I/O interfaces that connect above-mentioned Vehicular system, the pulse signal of different frequency is processed and exported respectively by the I/O interface to the timing signal that the clock signal that described single-chip microcomputer reception crystal oscillating circuit sends and timer send.
Select vehicle to need detection system, vehicle needs the operating voltage of detection system identical with the single-chip microcomputer operating voltage, will choose the Vehicular system connection power module that needs to detect and meet above-mentioned condition.Power module changes civil power 220V alternating current into direct current to vehicle detecting system and single-chip microcomputer power supply.Single-chip microcomputer receives the clock signal of crystal oscillating circuit output in real time, determine the cycle of single-chip microcomputer internal work, simultaneously, timer is by sending timing signal to single-chip microcomputer work period timer counter, single-chip microcomputer receives above-mentioned signal and processes, produce at set intervals and interrupt, and export respectively the pulse signal of different frequency by some I/O interfaces, just can receive the pulse signal of different frequency when Vehicular system connects above-mentioned I/O interface.After the Vehicular system of above-mentioned signal through detection, employing can display waveform and host computer or the oscillograph of electric voltage frequency show, to carry out contrast on waveform and frequency through the front signal of the signal after the Vehicular system that detects and corresponding input, if waveform or frequency are different, the Vehicular system of expression detection has fault, otherwise, do not have.I/O is the abbreviation of input/output, i.e. input/output port, and each equipment can have the I/O address of a special use, is used for processing the input/output information of oneself.Single-chip microcomputer is connected with external unit and exchanges data all needs to realize by the I/O interface.
In the signal generating circuit of above-mentioned detection Vehicular system, described some I/O interfaces are five I/O interfaces.Export respectively the pulse signal of different frequency by five I/O interfaces, can have more comparison to make testing result more accurate.
In the signal generating circuit of above-mentioned detection Vehicular system, described single-chip microcomputer also is connected be used to the reset circuit that makes monolithic processor resetting.Single-chip microcomputer all needs reset circuit to reset when starting, so that each parts of Single Chip Microcomputer (SCM) system are in definite original state, and starts working from initial state.
In the signal generating circuit of above-mentioned detection Vehicular system, also be connected with the auxiliary circuit of integrated three-terminal voltage-stabilizing between described power module and single-chip microcomputer, described auxiliary circuit also is used for connecting the Vehicular system that needs detection.Auxiliary circuit becomes the power module output voltage frequency stablize and exports to single-chip microcomputer and Vehicular system is powered.
In the signal generating circuit of above-mentioned detection Vehicular system, be in series with the hand switch for the opening and closing way circuit between described auxiliary circuit and power module.Hand switch can control circuit opening and closing, convenient and practical.
In the signal generating circuit of above-mentioned detection Vehicular system, described power module comprises transformer, rectification circuit and filtering circuit, described primary connects civil power, described transformer secondary output connects rectification circuit, described rectification circuit connects filtering circuit, described filtering circuit connects auxiliary circuit, the hand switch of connecting between described filtering circuit and auxiliary circuit.Transformer changes the civil power transformation into less alternating voltage, changes DC voltage into through rectification circuit, then exports after wave circuit filtering after filtration.
Compared with prior art, the signal generating circuit of this detection Vehicular system has the following advantages:
1, the utility model sends to by the pulse signal that single-chip microcomputer produces different frequency the Vehicular system that needs detection, operating personnel can be by carrying out the contrast of waveform and frequency through the signal of Vehicular system and the signal of original input, and whether the detection system that checks vehicles has fault.
2, the utility model uses single-chip microcomputer to replace sensor, and low price finds faster whether the Vehicular system that detects has fault.
3, the utility model is applicable to the operating voltage Vehicular system identical with the single-chip microcomputer operating voltage, and the scope of application is wider.
Description of drawings
Fig. 1 is structural representation of the present utility model.
In figure, 1, single-chip microcomputer; 2, I/O interface; 3, timer; 4, crystal oscillating circuit; 5, reset circuit; 6, auxiliary circuit; 7, hand switch; 8, transformer; 9, rectification circuit; 10, filtering circuit.
Embodiment
Be below specific embodiment of the utility model and by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiment.
as shown in Figure 1, the signal generating circuit of this detection Vehicular system, comprise single-chip microcomputer 1, single-chip microcomputer 1 is connected with the power module that civil power is changed into direct current and the Vehicular system that give to need detects and single-chip microcomputer 1 power supply, the input port of single-chip microcomputer 1 is connected with the crystal oscillating circuit 4 for 1 work period of tranmitting data register signal controlling single-chip microcomputer, single-chip microcomputer 1 includes by the timer 3 to 1 work period of single-chip microcomputer time and count control single-chip microcomputer 1 output pulse signal frequency, single-chip microcomputer 1 also comprises be used to the some I/O interfaces 2 that connect above-mentioned Vehicular system, the pulse signal of different frequency is processed and exported respectively by I/O interface 2 to the timing signal that the clock signal that single-chip microcomputer 1 reception crystal oscillating circuit 4 sends and timer 3 send, also be connected with the auxiliary circuit 6 of integrated three-terminal voltage-stabilizing between power module and single-chip microcomputer 1, be in series with the hand switch 7 for the opening and closing way circuit between auxiliary circuit 6 and power module, auxiliary circuit 6 also is used for connecting Vehicular system.Single-chip microcomputer 1 also is connected with for the clock circuit that sends the timing signal with for the reset circuit 5 that single-chip microcomputer 1 is resetted, above-mentioned power module comprises transformer 8, rectification circuit 9 and filtering circuit 10, the elementary connection civil power of transformer 8,8 levels of transformer connect rectification circuit 9, rectification circuit 9 connects filtering circuit 10, filtering circuit 10 connects auxiliary circuits 6, the hand switch 7 of connecting between filtering circuit 10 and auxiliary circuit 6.
Select vehicle to need detection system, the operating voltage of Vehicular system is identical with single-chip microcomputer 1 operating voltage, the Vehicular system that detects is connected respectively five I/O interfaces 2 of auxiliary circuit 6 and single-chip microcomputer 1.In power module, transformer 8 changes civil power 220V alternating voltage transformation into less alternating voltage, changes direct current into through the rectification circuit 9 in power module, then through exporting after filtering circuit 10 filtering in power module.By the conducting between hand switch 7 control filtering circuits 10 and auxiliary circuit 6.Auxiliary circuit 6 must not be electric when hand switch 7 disconnects, and this circuit is not worked; When hand switch 7 was closed, filtering circuit 10 output voltages were to auxiliary circuit 6, auxiliary circuit 6 with the voltage voltage stabilizing of input after as the power supply of single-chip microcomputer 1 and vehicle detecting system.
Reset circuit 5 resets when single-chip microcomputer 1 gets electric startup, so that single-chip microcomputer 1 various parts is in definite original state, and starts working from initial state.Single-chip microcomputer 1 has program storage, and program storage is used for preserving application code, can also be used for simultaneously the data of using when save routine is carried out.Single-chip microcomputer 1 receives the signal of crystal oscillating circuit 4 and timer 3 transmissions, the work period of crystal oscillating circuit 4 control single chip computers 1, the work period of 3 pairs of single-chip microcomputers 1 of timer is carried out timer counter, when the initial value of giving timer 3 can not obtain various timings simultaneously, can produce the pulse signal of different frequency by the difference of timing, the frequency values of the pulse signal of output can be set by operating personnel oneself, is set as the square-wave pulse signal of two-way 500Hz and three road 300Hz here.Auxiliary circuit 6 input single-chip microcomputer 1 voltages are processed through the s operation control of designing program of write-in program storer, from the square-wave pulse signal of five I/O interfaces, 2 output two-way 500Hz and three road 300Hz.Produce signal with the program of design and divide three levels: mode is identified, input parameter and calculation process, timing and output.Transfer master routine and setting software timer 3 patterns during beginning, call again initialize routine, the pulse signal of two frequencies will exporting is processed timer 3 is put initial value and left in successively in program storage, during the program operation, call interrupt service routine, produce at regular intervals and interrupt, take out number respectively from 2 outputs of five I/O interfaces from storer, the square-wave pulse signal that circulation like this produces two-way 500Hz and three road 300Hz is successively exported respectively.Vehicle detecting system receives the square-wave pulse signal of two-way 500Hz and three road 300Hz successively by connecting above-mentioned I/O interface 2.
After the Vehicular system of above-mentioned signal through detection, employing can display waveform and host computer or the oscillograph of electric voltage frequency show, by to carry out the contrast on waveform and frequency through the signal before the signal after vehicle detecting system and corresponding input, if waveform or frequency are different, the Vehicular system of expression detection has fault, otherwise, do not have.This circuit is convenient and simple, and whether the system that checks vehicles has fault speed fast.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or replenishes or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Although this paper has more used the terms such as single-chip microcomputer 1, I/O interface 2, timer 3, crystal oscillating circuit 4, reset circuit 5, auxiliary circuit 6, hand switch 7, transformer 8, rectification circuit 9, filtering circuit 10, do not get rid of the possibility of using other term.Using these terms is only in order to describe more easily and explain essence of the present utility model; They are construed to any additional restriction is all contrary with the utility model spirit.
Claims (6)
1. signal generating circuit that detects Vehicular system, it is characterized in that, this circuit comprises single-chip microcomputer (1), described single-chip microcomputer (1) is connected with the power module that civil power is changed into direct current and the Vehicular system that give to need detects and single-chip microcomputer (1) power supply, the input port of described single-chip microcomputer (1) is connected with the crystal oscillating circuit (4) for tranmitting data register signal controlling single-chip microcomputer (1) work period, described single-chip microcomputer (1) includes by the timer (3) to single-chip microcomputer (1) work period time and count control single-chip microcomputer (1) output pulse signal frequency, described single-chip microcomputer (1) also comprises be used to the some I/O interfaces (2) that connect above-mentioned Vehicular system, described single-chip microcomputer (1) receives timing signal that clock signal that crystal oscillating circuit (4) sends and timer (3) send and processes and pass through the pulse signal that I/O interface (2) is exported respectively different frequency.
2. the signal generating circuit of detection Vehicular system according to claim 1, is characterized in that, described some I/O interfaces (2) are five I/O interfaces (2).
3. the signal generating circuit of detection Vehicular system according to claim 2, is characterized in that, described single-chip microcomputer (1) also is connected be used to the reset circuit (5) that single-chip microcomputer (1) is resetted.
4. the signal generating circuit of according to claim 2 or 3 described detection Vehicular systems, it is characterized in that, also be connected with the auxiliary circuit (6) of integrated three-terminal voltage-stabilizing between described power module and single-chip microcomputer (1), described auxiliary circuit (6) also is used for connecting the Vehicular system that needs detection.
5. the signal generating circuit of detection Vehicular system according to claim 4, is characterized in that, is in series with the hand switch (7) for the opening and closing way circuit between described auxiliary circuit (6) and power module.
6. the signal generating circuit of detection Vehicular system according to claim 5, it is characterized in that, described power module comprises transformer (8), rectification circuit (9) and filtering circuit (10), the elementary connection civil power of described transformer (8), the secondary connection rectification circuit of described transformer (8) (9), described rectification circuit (9) connects filtering circuit (10), described filtering circuit (10) connects auxiliary circuit (6), the hand switch (7) of connecting between described filtering circuit (10) and auxiliary circuit (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220602111 CN202974671U (en) | 2012-11-14 | 2012-11-14 | A signal generating circuit used for detecting a vehicle system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220602111 CN202974671U (en) | 2012-11-14 | 2012-11-14 | A signal generating circuit used for detecting a vehicle system |
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| CN202974671U true CN202974671U (en) | 2013-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220602111 Expired - Fee Related CN202974671U (en) | 2012-11-14 | 2012-11-14 | A signal generating circuit used for detecting a vehicle system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106028588A (en) * | 2016-06-07 | 2016-10-12 | 中国南方航空工业(集团)有限公司 | Anti-collision light control device for helicopter |
| CN109696902A (en) * | 2018-12-06 | 2019-04-30 | 奇瑞汽车股份有限公司 | A kind of signal recording apparatus, fault point detection circuit and method |
-
2012
- 2012-11-14 CN CN 201220602111 patent/CN202974671U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106028588A (en) * | 2016-06-07 | 2016-10-12 | 中国南方航空工业(集团)有限公司 | Anti-collision light control device for helicopter |
| CN109696902A (en) * | 2018-12-06 | 2019-04-30 | 奇瑞汽车股份有限公司 | A kind of signal recording apparatus, fault point detection circuit and method |
| CN109696902B (en) * | 2018-12-06 | 2022-06-10 | 奇瑞汽车股份有限公司 | Signal recording device, fault point detection circuit and method |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130605 Termination date: 20131114 |