CN2359722Y - Speed-time display observing and control instrument - Google Patents
Speed-time display observing and control instrument Download PDFInfo
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- CN2359722Y CN2359722Y CN 97241360 CN97241360U CN2359722Y CN 2359722 Y CN2359722 Y CN 2359722Y CN 97241360 CN97241360 CN 97241360 CN 97241360 U CN97241360 U CN 97241360U CN 2359722 Y CN2359722 Y CN 2359722Y
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- 238000005259 measurement Methods 0.000 claims abstract description 10
- 230000015654 memory Effects 0.000 claims abstract description 10
- 230000005611 electricity Effects 0.000 claims description 9
- 238000002955 isolation Methods 0.000 claims description 3
- 230000008054 signal transmission Effects 0.000 claims description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 230000001939 inductive effect Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 6
- 230000006870 function Effects 0.000 description 5
- 238000010304 firing Methods 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
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Abstract
The utility model relates to a rotation speed and time display control instrument, which comprises a casing, wherein, the inner part of the casing is provided with an SCM, a power supply, an input signal processing circuit, an alarm output circuit, an electrically erasable memory circuit, an LED dynamic scan display control and drive circuit, a key input circuit, a sensor matched with the instrument, a front panel (9) and a rear panel (10) of the instrument. The instrument controls the measurement of rotation speed, the overspeed alarm of the rotation speed, and the curve of the rotary speed and time through inducing the current impulse waveform at the primary stage of an engine ignition coil.
Description
A kind of rotating speed-time showing measurement and control instrument belongs to the detecting instrument class, and it is a kind of digital displaying meter that is mainly used in petrol engine tachometric survey, over speed of rotation warning and rotating speed-time curve control.This instrument can be used for occasions such as engine rig test, engine production detect automatically, engine testing room.
In automobile industry, engine all needs to carry out bench test before dispatching from the factory, and whether reaches the requirement of regulation with the performance of check engine.The stability that significant data is exactly an engine speed need measuring when doing bench test.Need the rotating speed of engine is measured for this reason.At present, there are problems mostly in the domestic instrument that is used to measure rotating speed, as: no overspeed alarming function, when the user needs this function, need join overspeed detection and warning device in addition; Do not have rotating speed-time-program(me) control function, and this function engine test institute is prerequisite often; Sensor is installed inconvenience, and as the gear of magnetoelectric sensor need one 60 tooth of installation on engine shaft, and the spacing of sensing head and gear is very little, and spacing has strict demand; Sampling period is grown (mostly being 1 second fixed value).Thereby measure and control shortage real-time; Also some instrument measurement precision is lower, shows inadequately to stablize, and volume, weight, power consumption are all bigger, and interference free performance is not good enough, or the like.Though having released, foreign vendor is applicable to petrolic rotating speed measure and control instrument.As the little wild CT-651 that surveys device of Japan, it adopts the method for measuring the elementary or secondary initial firing current pulse of ignition coil for gasoline engine to measure rotating speed.Its sensor is a direct current current sensor, and this sensor isolation is good, the response fast, and only need be held on when installing on the elementary or secondary lead of ignition coil and get final product, and is very convenient.This instrument measurement precision height, anti-interference is good, has the 0-2V aanalogvoltage output that is proportional to rotating speed to be used for rotating speed control (when needing to report to the police, user will deliver newspapers alarm device) outward.The more domestic instrument of this instrument has bigger improvement, but its complex circuit, parameter are provided with inconvenience, and volume, weight, power consumption are all bigger, do not have direct alarm actuating contact output, no rotating speed-time-program(me) control function etc.Price is also more expensive in addition.
In order to overcome at present the shortcoming of tachometer both at home and abroad, the utility model has designed a kind of brand-new good rotating speed-time measurement of the ratio of performance to price and has shown controller.
Rotating speed of the present utility model-time measurement shows that controller is a core with the tailored version single-chip microcomputer, is equipped with two-wire system serial line interface electricity and can wipes memory.10MHz serial line interface LED dynamic scan shows Control Driver, the efficient isolated converter of DC/DC, DC current sensor, button inputting circuits, input signal treatment circuit, warning output circuit and constitutes.The special instrument software of compiling is through well-designed and optimization repeatedly.Instrument face plate has adopted film face-plate.Meter case has adopted 96 * 96 injection casings of international standard.
Because the optimal combination of this instrument software and hardware and good structural design thereof make it have advantages such as simple, the powerful and convenient use of hardware circuit.Also make instrument have advantages such as high precision, highly reliable, high performance price ratio, intellectuality in addition.
Describe in detail below in conjunction with accompanying drawing and most preferred embodiment concrete structure this utility model instrument.
Figure one is the schematic appearance of the utility model instrument.
Figure two is the schematic block circuit diagram of the utility model instrument.
As seen from the figure, the utility model instrument is can wipe memory circuit 4, input signal treatment circuit 5, single chip circuit 6, LED dynamic scan by casing 1 and the electricity that is located at casing 1 lip-deep front panel 2, rear panel 3 and is arranged in 1 li of casing to show that control and driving circuit 8, warning output circuit 9, button inputting circuits 10, power circuit 11 constitute.Electricity can be wiped memory circuit 4, output signal processing circuit 5, LED dynamic scan and show that control and driving circuit 8, warning output circuit 9, button inputting circuits 10 link to each other with single chip circuit 6 respectively, shows with the LED dynamic scan and controls and driving circuit 8 is connected with one 8 light-emitting diode displays 7.Wherein:
Electricity can be wiped the power down protection that memory circuit 4 is used for setup parameter; circuit adopts 8 pin two-wire system serial line interface eeprom chips, has saved the hardware spending of single-chip microcomputer greatly, and can make circuit reduction; improve the reliability of instrument, also saved the trouble of periodic replacement battery in addition.Cooperate software also can realize importing easily many group parameters.
Adopt input signal treatment circuit 5 to be because the low dawn of the signal amplitude that sensor is sent here is entrained with high frequency interference and other interference component, must handle it.This circuit carries out secondary RC low-pass filtering to signal earlier, amplifies the shaping with Schmidt then, is transferred to single-chip microcomputer 6 by optocoupler at last, has guaranteed the accurate measurement of instrument, has improved the antijamming capability of instrument.
Single-chip microcomputer 6 chips that adopted are 20 line high-performance low-power-consumption CMOS, eight bit architectures.Include 2Kb can 1000 times the flash memories rewritten of electricity, its data can be preserved 10 years, but but other has 128 * 8 RAM, two-stage program encryption, 15 journey I/O lines, two 16 bit timings/counters, 5 grades of interrupt source journey serial UART passages, direct LED to drive analog comparator, house dog etc. in output, the sheet.Its operating frequency can reach 24MHz.These performances and resource are enough to satisfy the requirement of this instrument, and resource utilization is higher, thereby hardware circuit is fully simplified, and have avoided adopting the above complicated single-chip microcomputer of 40 lead-in wires.
The LED dynamic scan shows that control and driving circuit 8 adopt 24 pin monolithic 10MHz serial line interface LED dynamic scans to show control and chip for driving, the dynamic scan that its periphery only needs a resistance can finish eight LED charactrons shows control and drives, and only take three position OPADD of single-chip microcomputer, make hardware become extremely simple and reliable.Also can make the user change display brightness at any time in addition, reach not only energy-conservation but also be convenient to the effect that measured value is observed.
Warning output circuit 9 has two outputs when action: the one, and on instrument front panel 2, produce red light and report to the police; The 2nd, the internal alarm actuating of relay; draw so that cut off the engine ignition power supply its contact; instrument detect racing of the engine running or engine in the running its inner engine oil pressure cross abnormal conditions such as low and all carry out warning; and in case it is promptly locked to report to the police; must remove the warning rear engine by the operator can restart, thereby makes engine obtain reliable protection.Make this instrument be specially adapted to the occasion of engine test.
Button inputting circuits 10 adopts three buttons can finish the input of all parameters.The hardware spending of single-chip microcomputer 6 has mainly been finished, has been saved like this in the input of each parameter by software, improved the reliability of instrument, uses easily.
The power circuit 11 that is adopted or not the series connection stabilized voltage supply for the DC/DC isolation type switching power supply, though cost is higher, have high reliability, energy-efficient, simplify circuit, reduce the instrument volume and weight, improve the advantages such as interference free performance of instrument.For further improving the interference free performance of instrument, the power-supply system power supply that this instrument adopts inside and outside two covers to isolate.Power supply provides power supply for single-chip microcomputer 6 and EEPROM etc. in the 5V, external power branch+12V ,-the 12V two-way, they provide power supply for warning output circuit 9, input signal treatment circuit 5 and sensor etc.Signal transmission between internal power circuit and external power circuit is all finished by photoelectrical coupler.Blocked the coupling channel that disturbs.
For petrol engine, the characteristic that this instrument utilizes its initial firing current pulsed frequency to be directly proportional with its rotating speed, adopt a kind of Novel DC current sensor to measure its initial firing current pulsed frequency, the powerful calculating ability of bringing into play single-chip microcomputer 6 again is converted to tachometer value with the frequency values that records.It is extremely convenient that this type of sensor is installed.Therefore this instrument is particularly useful for the occasion of petrol engine rotating speed observing and controlling.
The course of work of the utility model instrument is: it is elementary or the elementary lead-in wire of ignition coil passed from sensor that sensor clip is held in ignition coil, connects power supply, opens instrument power, can set and tachometric survey.
Claims (2)
1. rotating speed-time showing measurement and control instrument, it is characterized in that: it can wipe by casing 1 and the electricity that is located at casing 1 lip-deep front panel 2, rear panel 3 and is installed in 1 li of casing that memory circuit 4, input signal treatment circuit 5, single-chip microcomputer 6, LED dynamic scan show control and driving circuit 8, warning output circuit 9, button inputting circuits 10, power circuit 11 and the sensor that uses that matches with instrument is formed, wherein:
A. electricity can be wiped memory circuit 4, input signal treatment circuit 5, the demonstration of LED dynamic scan controls and driving circuit 8, warning output circuit 9 and button inputting circuits 10 link to each other with single-chip microcomputer 6 respectively;
B. it is 8 pin two-wire system serial line interface eeprom chips that described electricity can be wiped memory circuit 4;
C. described single-chip microcomputer 6 chips are 20 line high-performance low-power-consumption CMOS, eight bit architectures.Include 2Kb can 1000 times the flash memories rewritten of electricity, but other but 128 * 8 RAM, two-stage program encryption, 15 journey I/O lines, two 16 bit timings/counters, 5 grades of interrupt source journey serial UART passages are arranged, directly LED drive analog comparator, house dog etc. in output, the sheet;
The d.LED dynamic scan shows that control and driving circuit 8 are linked with one 8 light-emitting diode displays 7;
The e.LED dynamic scan shows that control and driving circuit 8 are that 24 pin monolithic 10MHz serial line interface LED dynamic scans show control and chip for driving;
F. described power circuit 11 is the DC/DC isolation type switching power supply, and power supply provides power supply for single-chip microcomputer 6 and EEPROM in the 5V, external power branch+12V ,-the 12V two-way, they provide power supply for warning output circuit 9, input signal treatment circuit 5 and sensor etc.Signal transmission between internal power circuit and external power circuit is all finished by photoelectrical coupler.
2. rotating speed as claimed in claim 1-time showing measurement and control instrument is characterized in that matching used with it sensor is a DC current sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97241360 CN2359722Y (en) | 1997-10-07 | 1997-10-07 | Speed-time display observing and control instrument |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 97241360 CN2359722Y (en) | 1997-10-07 | 1997-10-07 | Speed-time display observing and control instrument |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2359722Y true CN2359722Y (en) | 2000-01-19 |
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ID=33950854
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 97241360 Expired - Fee Related CN2359722Y (en) | 1997-10-07 | 1997-10-07 | Speed-time display observing and control instrument |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2359722Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131330A (en) * | 2011-01-13 | 2011-07-20 | 科蒂斯仪器(中国)有限公司 | Circuit system of LED (light-emitting diode) display module of solid-state vehicle meter |
-
1997
- 1997-10-07 CN CN 97241360 patent/CN2359722Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131330A (en) * | 2011-01-13 | 2011-07-20 | 科蒂斯仪器(中国)有限公司 | Circuit system of LED (light-emitting diode) display module of solid-state vehicle meter |
| CN102131330B (en) * | 2011-01-13 | 2013-12-18 | 科蒂斯仪器(中国)有限公司 | Circuit system of LED (light-emitting diode) display module of solid-state vehicle meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP03 | Change of name, title or address |
Patentee address after: 430056 No. 1 Dongfeng Avenue, Wuhan economic and Technological Development Zone, Hubei, China Patentee address before: 442001 Shiyan city of Hubei Province Zhang Wan Chen Guixiang |
|
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |