CN101961982A - Digital automobile instrument of analogue signal sampling and automatic calibration - Google Patents
Digital automobile instrument of analogue signal sampling and automatic calibration Download PDFInfo
- Publication number
- CN101961982A CN101961982A CN2009100673161A CN200910067316A CN101961982A CN 101961982 A CN101961982 A CN 101961982A CN 2009100673161 A CN2009100673161 A CN 2009100673161A CN 200910067316 A CN200910067316 A CN 200910067316A CN 101961982 A CN101961982 A CN 101961982A
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- analog signal
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- 238000005070 sampling Methods 0.000 title claims abstract description 84
- 238000012937 correction Methods 0.000 claims description 10
- 230000006870 function Effects 0.000 claims description 4
- 238000012360 testing method Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 7
- 238000012545 processing Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000003442 weekly effect Effects 0.000 description 1
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Abstract
The invention relates to a digital automobile instrument of analogue signal sampling and automatic calibration, comprising an analogue signal sampling control circuit I, a power circuit II, a switch alarm circuit III, an instrument driving circuit IV, a digital and switch signal sampling circuit V and an instrument control chip; the analogue signal sampling control circuit I comprises a sampling electronic switch connected with a sampling reference voltage control module at one path, a sampling voltage module at one path, and another path is connected with the sampling switch control port of the instrument control chip. The invention is a control method and circuit for using control measures aiming at the voltage difference influence which may occur between the digital automobile instrument analogue sensor signal sampling circuit grounding and the instrument grounding, thereby eliminating the voltage influence which may exist in the sensor circuit.
Description
Technical field
The present invention relates to a kind of digital automobile instrument, a kind of specifically digital automobile instrument of analog signal automatic sampling correction.
Background technology
At present, the cooling water temperature of auto meter, amount of fuel, the signal input of sensors such as engine oil pressure is input as the master with analog signal basically, in the digital automobile instrument, mainly be to realize the parameter of each analog signal state is changed sampling by the size of measuring the respective sensor voltage signal to this type of Signal Processing, this class onboard sensor signal generally is with in the present pull up circuit of the form body of current signal, in the MCU of auto meter preposing signal process circuit, be translated into voltage signal earlier, and control its input voltage signal in the 0-5V scope by suitable mode, input to the A/D conversion input end of auto meter MCU then through the Filtering Processing of necessity, utilize in-to-in A/D conversion under software control, to finish and measure and drive to show.
Because the sampled voltage signal of analog signal sensors is subjected to all kinds of disturbing influences, can produce certain variation, disturb for some ccasuals in the circuit, can resist by suitable hardware handles, but because the pressure reduction between the instrument that causes behind some electrical work in circuit ground and the sensor ground, can influence the accuracy of analog signal sensors sampled voltage, and then cause the information of instrument demonstration and the information of existing condition to produce difference, can provide wrong information to driver and crew when serious, cause unnecessary driving risk to occur.
It mainly is at above issuable voltage of system disturbing influence that the present invention designs, and the specific aim design measure of taking, promptly by in the analog signal sensors sample circuit, increasing an electronic switch, and conducting and shutoff by auto meter MCU port controlling electronic switch, with every 100ms as a sampling period, control each cycle conducting electronic switch 10ms, 90ms turn-offs, the A/D sampling is sampled twice to each analog signal sensors at the electronic switch on off mode, when being the electronic switch unlatching, once sampling, measure the sample voltage value of analog signal sensors, before electronic switch is opened, measure once again, record the instrument ground that may occur and the voltage difference between the sensor ground.Utilize the value that measures for twice to calculate, obtain the sample voltage value of real simulated signal transducer, as the input value of the sampled voltage of current time analog signal sensors,, control corresponding analog signal instrument and show by calculating and the processing of auto meter MCU.
Summary of the invention
Problem to be solved by this invention is by take the control method and the circuit of measure of control at issuable voltage difference influence between digital automobile instrument analog sensor signal sample circuit ground connection and the instrumentation grounding, reaching the purpose of eliminating the voltage influence that may exist in the sensor line, thereby provide a kind of digital automobile instrument of analog signal automatic sampling correction.
The object of the present invention is achieved like this, and the digital automobile instrument of this analog signal automatic sampling correction comprises analog signal controlling of sampling circuit I, power circuit II, switch warning circuit III, instrument drive circuit I V, numeral and on-off signal sample circuit V, gauge control chip 3.
Described analog signal controlling of sampling circuit I comprises sampling reference voltage control module, sampled voltage module, has the gauge control chip of sampled voltage control port and sampled voltage input port, it is characterized in that: it also comprises a sampling electronic switch, described sampling electronic switch one tunnel connects sampling reference voltage control module, one the tunnel connects the sampled voltage module, and another road connects the sampling switch control port of gauge control chip.
Described auto meter analog signal automatic sampling correction control method is to increase an electronic switch in analog signal sensors voltage sample control circuit, adopt the unlatching and the shutoff of electronic switch control analog signal sensors sample circuit, on the basis that guarantees sensor voltage sampling function, eliminate being present in the voltage influence of sensor circuit;
Its concrete steps are as follows:
1., control sampled voltage module conducting 10ms in the sampling period by the sampled voltage control port of auto meter control chip, shutoff 90ms; By gauge control chip controls sampled voltage control port once sampling when the conducting, the record sampled voltage is to designated memory locations, sampled voltage control port once sampling again when turn-offing, and the record sampled voltage is to designated memory locations;
2., get above-mentioned 1. double sampling result's voltage difference, input value as actual samples, be after double sampling finishes, calculate the voltage difference of double sampling, and with this input value as the analog signal sensors sampled voltage, after handling by this sample voltage value by the gauge control chip, by the corresponding instrument indication of software program controlling and driving, can dynamically eliminate the influence of the voltage difference that produces between sensor ground and the instrument ground after handling like this to the instrument sampling precision, thus guaranteed that instrument is indicated and actual test value between accuracy.
The present invention is owing to the circuit that adopts said structure and method has the following advantages and good effect:
1, technical scheme of the present invention is the environment for use at present onboard instruments analog signal sensors, taken into full account different vehicle mounted electrical apparatus and may in the voltage sample treatment circuit that generally adopts at present, increase electronic switch control circuit the influence of sensor circuit.With respect to the conventional method of the sampling of present analog sensor signal (promptly phase in once sampling) weekly, technical scheme of the present invention is that the setting sampling period is 100ms, and be controlled in each sampling period by instrument MCU, the analog signal sensors voltage sampling circuit is opened 10ms, turn-offs 90ms.In circuit is opened the interval, measure the value of one-off pattern analog signal sampled voltage, result of a measurement is stored in the specific memory zone; In circuit turn-offs the interval, measure one-off pattern analog signal sample voltage value again, the result is stored in the specific memory zone.Control by auto meter MCU, the result of double sampling is carried out mathematical computations, and, can eliminate the voltage difference that exists between sensor line ground and the instrument ground so reliably to showing the influence of accuracy as a result with the input value of result calculated as analog signal sensors.
2, the present invention adopts the unlatching and the shutoff of electronic switch control analog signal sensors voltage sampling circuit, on the basis that guarantees sensor voltage sampling function, by to being present in the voltage influence double sampling of sensor circuit, can eliminate the influence of the voltage disturbance that sensor circuit may exist, improved the precision of sensor sample, simultaneously, turn-on and turn-off control by switch, also can reduce the energy of analog signal sensors circuitry consumes greatly, only need the value of choose reasonable sampling matched resistance R, the accurate controlling of sampling that just can adapt to different vehicle-mounted analog signal sensors shows for driver and crew provide dynamic on-vehicle information accurately and timely.
3, the inventive method has promptly guaranteed the accuracy of sampled signal, also can reduce simultaneously the power consumption of sensor circuit, improved the adaptedness of instrument product to the vehicle-mounted state of difference, improved the precision of instrument analog signal indication, this controlling models efficiently solves voltage difference between analog signal sensors ground and the instrument ground to the influence of instrument display precision.
Description of drawings
Fig. 1 is the digital automobile instrument integral structure block scheme of analog signal automatic sampling correction.
Fig. 2 is an analog signal controlling of sampling circuit logic block scheme of the present invention.
Fig. 3 is analog signal controlling of sampling schematic circuit diagram of the present invention.
The specific embodiment
Shown in accompanying drawing 1, the digital automobile instrument of this analog signal automatic sampling correction comprises analog signal controlling of sampling circuit I, power circuit II, switch warning circuit III, instrument drive circuit I V, numeral and on-off signal sample circuit V, gauge control chip 3.
Shown in accompanying drawing 2, this analog signal controlling of sampling circuit I comprises sampling reference voltage control module 1, sampled voltage module 2, the gauge control chip (MCU) 3 that has sampling switch control port 5 and sampled voltage input port (A/D) 6, sampling electronic switch 4, described sampling electronic switch 4 one tunnel connects sampling reference voltage control module 1, one the tunnel connects sampled voltage module 2, and another road connects the sampling switch control port 5 of gauge control chip (MCU) 3.
Described sampling electronic switch 4 adopts field effect transistor MOSFET-P; Sampling matched resistance R1 on sampling reference voltage control module 1 suitably selects its value at different analog signal sensors, and the sampled voltage of adjustable mould preparation analog signal sensor is controlled between the 0-5V reliably.
Described digital automobile instrument analog signal automatic sampling correction control method is: increase an electronic switch in the analog signal sensors sample circuit, adopt the unlatching and the shutoff of electronic switch control analog signal sensors sample circuit, on the basis that guarantees sensor voltage sampling function, eliminate the interference voltage influence that is present in sensor circuit.
Its concrete steps are as follows:
1., by the sampling switch control port 5 of auto meter control chip (MCU) 3, control field effect transistor MOSTFET-P conducting 10ms in the sampling period turn-offs 90ms.Sampled voltage input port (A/D) 6 once sampling when being controlled at conducting by auto meter control chip (MCU) 3, the record sampled voltage is to designated memory locations, sampled voltage input port (A/D) 6 once sampling again when turn-offing, the record sampled voltage is to designated memory locations;
2., get above-mentioned 1. double sampling result's voltage difference, input value as actual samples, be after double sampling finishes, calculate the voltage difference of double sampling, and with this input value as the analog signal sensors sampled voltage, after handling by this sample voltage value by gauge control chip (MCU) 3, by the corresponding instrument indication of software program controlling and driving, can dynamically eliminate the influence of the voltage difference that produces between sensor ground and the instrument ground after handling like this to the instrument pointing accuracy, thus guaranteed that instrument is indicated and actual test value between accuracy.
Claims (2)
1. the digital automobile instrument of an analog signal automatic sampling correction, it comprises analog signal controlling of sampling circuit I, power circuit II, switch warning circuit III, instrument drive circuit I V, numeral and on-off signal sample circuit V, gauge control chip (3), it is characterized in that: described analog signal controlling of sampling circuit I comprises a sampling electronic switch (4), described sampling electronic switch (4) a tunnel connects sampling reference voltage control module (1), one the tunnel connects sampled voltage module (2), and another road connects the sampling switch control port (5) of gauge control chip (3).
2. the automatic adjustment controlling means of digital automobile instrument analog signal of an analog signal automatic sampling correction, it is characterized in that: in analog signal sensors voltage sample control circuit, increase an electronic switch (4), adopt the unlatching and the shutoff of electronic switch (4) control analog signal sensors sample circuit, on the basis that guarantees sensor voltage sampling function, eliminate being present in the voltage influence of sensor circuit;
Its concrete steps are as follows:
1., control sampled voltage module (2) conducting 10ms in the sampling period by the sampled voltage control port (5) of auto meter control chip (3), shutoff 90ms; By gauge control chip (3) sampled voltage control port (5) once sampling when being controlled at conducting, the record sampled voltage is to designated memory locations, sampled voltage control port (5) once sampling again when turn-offing, and the record sampled voltage is to designated memory locations;
2., get above-mentioned 1. double sampling result's voltage difference, input value as actual samples, be after double sampling finishes, calculate the voltage difference of double sampling, and with this input value as the analog signal sensors sampled voltage, after handling by this sample voltage value by gauge control chip (3), by the corresponding instrument indication of software program controlling and driving, can dynamically eliminate the influence of the voltage difference that produces between sensor ground and the instrument ground after handling like this to the instrument pointing accuracy, thus guaranteed that instrument is indicated and actual test value between accuracy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910067316 CN101961982B (en) | 2009-07-22 | 2009-07-22 | Digital automobile instrument of analogue signal sampling and automatic calibration |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200910067316 CN101961982B (en) | 2009-07-22 | 2009-07-22 | Digital automobile instrument of analogue signal sampling and automatic calibration |
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| Publication Number | Publication Date |
|---|---|
| CN101961982A true CN101961982A (en) | 2011-02-02 |
| CN101961982B CN101961982B (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200910067316 Expired - Fee Related CN101961982B (en) | 2009-07-22 | 2009-07-22 | Digital automobile instrument of analogue signal sampling and automatic calibration |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865909A (en) * | 2012-09-12 | 2013-01-09 | 安徽江淮汽车股份有限公司 | Detection circuit for motormeter |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2649400Y (en) * | 2003-11-01 | 2004-10-20 | 陈旻 | Multifunctional display instrument for automobile |
| JP2007062402A (en) * | 2005-08-29 | 2007-03-15 | Nippon Seiki Co Ltd | Driving device of meter |
| CN200988431Y (en) * | 2006-12-27 | 2007-12-12 | 浙江吉利汽车研究院有限公司 | Digital automobile instrument with CAN assembly interface |
| CN201235754Y (en) * | 2008-06-27 | 2009-05-13 | 山东申普汽车控制技术有限公司 | Bus line type digitized automobile instrument integrated with recording storage function |
| CN201457088U (en) * | 2009-07-23 | 2010-05-12 | 四平慧宇仪表电气有限公司 | Digital automobile meter automatically calibrated by analog signal sampling |
-
2009
- 2009-07-22 CN CN 200910067316 patent/CN101961982B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2649400Y (en) * | 2003-11-01 | 2004-10-20 | 陈旻 | Multifunctional display instrument for automobile |
| JP2007062402A (en) * | 2005-08-29 | 2007-03-15 | Nippon Seiki Co Ltd | Driving device of meter |
| CN200988431Y (en) * | 2006-12-27 | 2007-12-12 | 浙江吉利汽车研究院有限公司 | Digital automobile instrument with CAN assembly interface |
| CN201235754Y (en) * | 2008-06-27 | 2009-05-13 | 山东申普汽车控制技术有限公司 | Bus line type digitized automobile instrument integrated with recording storage function |
| CN201457088U (en) * | 2009-07-23 | 2010-05-12 | 四平慧宇仪表电气有限公司 | Digital automobile meter automatically calibrated by analog signal sampling |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102865909A (en) * | 2012-09-12 | 2013-01-09 | 安徽江淮汽车股份有限公司 | Detection circuit for motormeter |
| CN102865909B (en) * | 2012-09-12 | 2014-07-16 | 安徽江淮汽车股份有限公司 | Detection circuit for motormeter |
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| Publication number | Publication date |
|---|---|
| CN101961982B (en) | 2013-04-24 |
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Owner name: JILIN DEKE ELECTRONIC CO., LTD. Free format text: FORMER OWNER: HUIYU INSTRUMENT ELECTRIC CO., LTD., SIPING Effective date: 20140123 |
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Effective date of registration: 20140123 Address after: 136001, Siping East Street, Siping City, Jilin Province, No. 1276 Patentee after: Jilin Deke Electronic Co.,Ltd. Address before: 136001, Siping East Street, Siping City, Jilin Province, No. 1276 Patentee before: SIPING HUIYU INSTRUMENT & ELECTRICAL Co.,Ltd. |
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Effective date of registration: 20200518 Address after: 136001, Siping East Street, Siping City, Jilin Province, No. 1276 Patentee after: JILIN QIMING ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: 136001, Siping East Street, Siping City, Jilin Province, No. 1276 Patentee before: JILIN DEKE ELECTRONIC Co.,Ltd. |
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Granted publication date: 20130424 |
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