CN102963256B - A kind of general auto meter signal converter and conversion method thereof - Google Patents
A kind of general auto meter signal converter and conversion method thereof Download PDFInfo
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- CN102963256B CN102963256B CN201210514254.6A CN201210514254A CN102963256B CN 102963256 B CN102963256 B CN 102963256B CN 201210514254 A CN201210514254 A CN 201210514254A CN 102963256 B CN102963256 B CN 102963256B
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Abstract
The present invention relates to a kind of general auto meter signal converter and conversion method thereof, conv gathers and calculates the engine speed after reequiping and vehicle speed pulse, calculate and export the tacho-pulse and vehicle speed pulse that match with former car instrument, making former car instrument continue accurately to show engine speed and speed information in real time.It comprises the inner MCU with data FLASH, the pulse acquisition circuit of adjustable frequency filtering, impulse output circuit and communication serial port, wherein the pulse acquisition circuit of adjustable frequency filtering gathers the rotational speed pulse signal of engine speed sensor and the vehicle speed pulse of car speed sensor respectively, after MCU process by impulse output circuit output speed impulse singla and vehicle speed pulse to the speed gage of gauge panel and average speed indicator; MCU is also communicated with PC by communication serial port simultaneously; Wherein, be provided with RC low-pass filter circuit in pulse acquisition circuit, RC low-pass filter circuit adopts fixed capacity and the adjustable digital potentiometer of resistance.
Description
Technical field
The invention belongs to technical field of automotive electronics, is a kind of general auto meter signal converter and conversion method thereof in particular.
Background technology
In automobile instrument panel, engine speed indicator and average speed indicator are two very important scales, and speed gage gathers engine speed sensor pulse, instruction present engine rotating speed, the working condition of reflection driving engine, average speed indicator gathers car speed sensor pulse, instruction current vehicle speed and change thereof.Tachogen and car speed sensor have a key parameter to be called pulse count, its represents when driving engine or vehicle wheel rotation one week, exports several square-wave pulse, when such as tachogen pulse count is 4, transmitting set rotates N week, exports (4*N) individual square-wave pulse.Speed gage calculates current rotating speed according to the engine speed sensor impulse rate gathered and tachogen pulse count, and the car speed sensor impulse rate that average speed indicator exports according to change speed gear box, car speed sensor pulse count and diameter of tyres calculate current vehicle speed.
Current vehicle refitting is day by day general, the repacking of driving engine, change speed gear box and tire all can cause the misdirection of engine speed indicator and average speed indicator, the inconsistent meeting of tacho pulse number before and after engine modification causes speed gage to show mistake, cannot Timeliness coverage when causing driving engine to break down.Car speed sensor pulse count or the inconsistent meeting of diameter of tyres of change speed gear box or tire repacking front and back cause average speed indicator to show mistake, owing to correctly cannot reflect current vehicle speed, are just difficult to reach economic speed per hour, simultaneously also cannot Timeliness coverage when there is hypervelocity phenomenon.
Summary of the invention
Object of the present invention, exactly for solving the problem, provides a kind of general auto meter signal converter and conversion method thereof, and it realizes the engine speed of repacking front and back and the frequency inverted of vehicle speed pulse.Conv gathers and calculates the engine speed after reequiping and vehicle speed pulse, calculates and exports the tacho-pulse and vehicle speed pulse that match with former car instrument, makes former car instrument continue accurately to show engine speed and speed information in real time.
For achieving the above object, the present invention adopts following technical scheme:
A kind of general auto meter signal converter, it comprises the inner MCU with data FLASH, the pulse acquisition circuit of adjustable frequency filtering, impulse output circuit and communication serial port, wherein the pulse acquisition circuit of adjustable frequency filtering gathers the rotational speed pulse signal of engine speed sensor and the vehicle speed pulse of car speed sensor respectively, after MCU process by impulse output circuit output speed impulse singla and vehicle speed pulse to the speed gage of gauge panel and average speed indicator; MCU is also communicated with PC by communication serial port simultaneously; Wherein, be provided with RC low-pass filter circuit in pulse acquisition circuit, RC low-pass filter circuit adopts fixed capacity and the adjustable digital potentiometer of resistance.
The pulse acquisition circuit of described adjustable frequency filtering also comprises shaping circuit, the rotating speed collected and car speed sensor signal are converted to Transistor-Transistor Logic level by it, the burr in pulse is removed through RC low-pass filter circuit, then MCU is sent into, the timed capture module of MCU catches positive rise and the falling edge of impulse singla, and the positive rise in the statistical unit time and falling edge number of times obtain impulse rate.
Described gauge signal converter is also provided with LED indicating circuit.
The conversion method of general auto meter signal converter, first download the engine speed sensor pulse count before and after reequiping, car speed sensor pulse count and diameter of tyres by communication serial port from PC, parameter configuration stores in the nonvolatile memory by conv; Conv is according to the frequency filtering of refiting engine tachogen pulse count adjustment tacho-pulse Acquisition Circuit, the frequency filtering of vehicle speed pulse Acquisition Circuit is adjusted according to repacking vehicle speed pulse sensor pulse number and diameter of tyres, then gather and calculation engine tachometer value and vehicle speed value, calculate according to tachometer value and former car engine tachogen pulse count and export the tacho-pulse mated with former car instrument, calculate according to vehicle speed value, former car car speed sensor pulse count and diameter of tyres and export the vehicle speed pulse mated with former car instrument.
Its impulse rate switch process is:
The pulse collection LPF threshold value of step 1) adjustment gauge signal converter pulse acquisition circuit, gathers and calculation engine tacho-pulse frequency and vehicle speed pulse frequency respectively;
Step 2) calculate practical engine speeds and the speed of a motor vehicle;
Step 3) calculates and the tacho-pulse frequency of former car instrument adaptation and speed of a motor vehicle frequency, then exports square-wave pulse to the speed gage of gauge panel and average speed indicator by the impulse output circuit of gauge signal converter, thus shows correct rotating speed and the speed of a motor vehicle.
In described step 1), when the pulse count of engine speed sensor and car speed sensor changes, the cutoff frequency of low-pass filter circuit needs respective change, now realized the adaptive pulse collection of LPF threshold value programmable by digital potentiometer adjustment low-pass cut-off frequencies, ensure the commonality of conv.
Described step 2) in, being calculated as follows of engine speed and the speed of a motor vehicle:
The actual interval of engine speed is [0,7000] rpm, and the corresponding relation of its impulse rate Fengine and rotating speed and pulse count Nengine is:
Fengine=(engine speed/60) * Nengine (1-1)
Engine speed=(Fengine/Nenging) * 60 (1-2)
The actual interval of the speed of a motor vehicle is [0,240] km/h, its impulse rate Fcar and the speed of a motor vehicle, the corresponding relation of diameter of tyres D and pulse count Ncar is:
Fcar=(speed of a motor vehicle/(3.6*PI*D)) * Ncar (1-3)
The speed of a motor vehicle=(Fcar/Ncar) * PI*D*3.6 (1-4)
PI is circular constant constant;
The computing formula of the low-pass cut-off frequencies F of RC low-pass filter circuit is as follows:
F=1/(2*PI*R*C)(1-5)
According to the resistance value of the RC low-pass filter circuit in maximum rotating speed/vehicle speed pulse set of frequency pulse collection, Fengine maxim is (7000/60) * Nengine, Fcar maxim is (240/ (PI*d)) * Ncar, the resistance value of the RC low-pass filter circuit in engine speed pulse collection is set, make low-pass cut-off frequencies F>Fengine maxim, the resistance value of the RC low-pass filter circuit in vehicle speed pulse collection is set, makes low-pass cut-off frequencies F>Fcar maxim;
Practical engine speeds and actual vehicle speed is obtained according to formula (1-2), (1-4), former car engine tachogen pulse count is substituted into formula (1-1), try to achieve the engine speed impulse rate with former car speed gage adaptation, former car car speed sensor pulse count and diameter of tyres are substituted into formula (1-3), tries to achieve the vehicle speed pulse frequency with former car average speed indicator adaptation.
Described PC downloads engine speed sensor and car speed sensor pulse count and diameter of tyres configuration parameter by serial ports, download conv successfully configuration parameter to be stored in the data FLASH of MCU inside, download unsuccessful, conv Returning communication fault, prompting PC is downloaded again.
Described PC and conv adopt the mode of fixed format message to communicate, and the unified employing of message format is as follows:
Heading (0x55+0xaa)+message ID+ message content+16 bit check and
ID, message direction of transfer and message content relation are corresponding as follows:
ID=1, data are byte, are sent to conv by PC, represent refiting engine tacho pulse number;
ID=2, data are byte, are sent to conv by PC, represent former car engine tacho pulse number;
ID=3, data are byte, are sent to conv by PC, represent repacking change speed gear box vehicle speed pulse number;
ID=4, data are byte, are sent to conv by PC, represent former car vehicle speed pulse number;
ID=5, data are double byte, are sent to conv by PC, represent repacking diameter of tyres;
ID=6, data are double byte, are sent to conv by PC, represent former vehicle tyre diameter;
ID=7, data are byte, are sent to PC by conv, and data=0x01 represents configuration parameter success, and data=0x02 represents to there is communication failure.
Parameter is stored in the data FLASH of MCU inside by described conv, after each conv powers on, just can read above-mentioned parameter successively from fixed position, if the parameter read is 0xff, represent and never carried out parameter downloads, light fault LED instruction, prompting user carries out the download of parameter.
The invention has the beneficial effects as follows:
1, realize the engine speed pulse of repacking front and back and the frequency inverted of vehicle speed pulse, make former car instrument continue accurately to show engine speed and speed information in real time;
2, carry out the parameter configuration of reequiping front and back by serial ports, carry out corresponding frequency inverted by different configurations, realize the commonality of conv;
3, adjusted the low-pass cut-off frequencies of rotating speed and vehicle speed pulse Acquisition Circuit by digital potentiometer, realize adaptive pulse collection, ensure the commonality of conv.
Accompanying drawing explanation
Fig. 1 is gauge signal converter constructional drawing of the present invention;
Fig. 2 is for adopting signal converter software flow pattern of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing and embodiment, the present invention will be further described.
In Fig. 1, signal converter comprises and mainly comprises five parts: inner MCU, the pulse acquisition circuit of adjustable frequency filtering, impulse output circuit, RS232 serial communication circuit, LED indicating circuit with data FLASH, RS232 serial communication realizes parameter configuration, whether LED indicates conv download parameters, and converter hardware structure as shown in Figure 1.The pulse acquisition circuit of adjustable frequency filtering gathers the rotational speed pulse signal of engine speed sensor and the vehicle speed pulse of car speed sensor respectively, after MCU process by impulse output circuit output speed impulse singla and vehicle speed pulse to the speed gage of gauge panel and average speed indicator; MCU is also communicated with PC by communication serial port simultaneously; Wherein, be provided with RC low-pass filter circuit in pulse acquisition circuit, RC low-pass filter circuit adopts fixed capacity and the adjustable digital potentiometer of resistance.The pulse acquisition circuit of adjustable frequency filtering also comprises shaping circuit, the rotating speed collected and car speed sensor signal are converted to Transistor-Transistor Logic level by it, the burr in pulse is removed through RC low-pass filter circuit, then MCU is sent into, the timed capture module of MCU catches positive rise and the falling edge of impulse singla, and the positive rise in the statistical unit time and falling edge number of times obtain impulse rate.Gauge signal converter is also provided with LED indicating circuit.
In Fig. 2, method of work of the present invention is:
First download the engine speed sensor pulse count before and after reequiping, car speed sensor pulse count and diameter of tyres by communication serial port from PC, parameter configuration stores in the nonvolatile memory by conv; Conv is according to the frequency filtering of refiting engine tachogen pulse count adjustment tacho-pulse Acquisition Circuit, the frequency filtering of vehicle speed pulse Acquisition Circuit is adjusted according to repacking vehicle speed pulse sensor pulse number and diameter of tyres, then gather and calculation engine tachometer value and vehicle speed value, calculate according to tachometer value and former car engine tachogen pulse count and export the tacho-pulse mated with former car instrument, calculate according to vehicle speed value, former car car speed sensor pulse count and diameter of tyres and export the vehicle speed pulse mated with former car instrument.
Its impulse rate switch process is:
The pulse collection LPF threshold value of step 1) adjustment gauge signal converter pulse acquisition circuit, gathers and calculation engine tacho-pulse frequency and vehicle speed pulse frequency respectively;
Step 2) calculate practical engine speeds and the speed of a motor vehicle;
Step 3) calculates and the tacho-pulse frequency of former car instrument adaptation and speed of a motor vehicle frequency, then exports square-wave pulse to the speed gage of gauge panel and average speed indicator by the impulse output circuit of gauge signal converter, thus shows correct rotating speed and the speed of a motor vehicle.
In described step 1), when the pulse count of engine speed sensor and car speed sensor changes, the cutoff frequency of low-pass filter circuit needs respective change, now realized the adaptive pulse collection of LPF threshold value programmable by digital potentiometer adjustment low-pass cut-off frequencies, ensure the commonality of conv.
Described step 2) in, being calculated as follows of engine speed and the speed of a motor vehicle:
The actual interval of engine speed is [0,7000] rpm, and the corresponding relation of its impulse rate Fengine and rotating speed and pulse count Nengine is:
Fengine=(engine speed/60) * Nengine (1-1)
Engine speed=(Fengine/Nenging) * 60 (1-2)
The actual interval of the speed of a motor vehicle is [0,240] km/h, its impulse rate Fcar and the speed of a motor vehicle, the corresponding relation of diameter of tyres D and pulse count Ncar is:
Fcar=(speed of a motor vehicle/(3.6*PI*D)) * Ncar (1-3)
The speed of a motor vehicle=(Fcar/Ncar) * PI*D*3.6 (1-4)
PI is circular constant constant;
The computing formula of the low-pass cut-off frequencies F of RC low-pass filter circuit is as follows:
F=1/(2*PI*R*C)(1-5)
According to the resistance value of the RC low-pass filter circuit in maximum rotating speed/vehicle speed pulse set of frequency pulse collection, Fengine maxim is (7000/60) * Nengine, Fcar maxim is (240/ (PI*d)) * Ncar, the resistance value of the RC low-pass filter circuit in engine speed pulse collection is set, make low-pass cut-off frequencies F>Fengine maxim, the resistance value of the RC low-pass filter circuit in vehicle speed pulse collection is set, makes low-pass cut-off frequencies F>Fcar maxim;
Practical engine speeds and actual vehicle speed is obtained according to formula (1-2), (1-4), former car engine tachogen pulse count is substituted into formula (1-1), try to achieve the engine speed impulse rate with former car speed gage adaptation, former car car speed sensor pulse count and diameter of tyres are substituted into formula (1-3), tries to achieve the vehicle speed pulse frequency with former car average speed indicator adaptation.
PC downloads engine speed sensor and car speed sensor pulse count and diameter of tyres configuration parameter by serial ports, download conv successfully configuration parameter to be stored in the data FLASH of MCU inside, download unsuccessful, conv Returning communication fault, prompting PC is downloaded again.
PC and conv adopt the mode of fixed format message to communicate, and the unified employing of message format is as follows:
Heading (0x55+0xaa)+message ID+ message content+16 bit check and
ID, message direction of transfer and message content relation are corresponding as follows:
ID=1, data are byte, are sent to conv by PC, represent refiting engine tacho pulse number;
ID=2, data are byte, are sent to conv by PC, represent former car engine tacho pulse number;
ID=3, data are byte, are sent to conv by PC, represent repacking change speed gear box vehicle speed pulse number;
ID=4, data are byte, are sent to conv by PC, represent former car vehicle speed pulse number;
ID=5, data are double byte, are sent to conv by PC, represent repacking diameter of tyres;
ID=6, data are double byte, are sent to conv by PC, represent former vehicle tyre diameter;
ID=7, data are byte, are sent to PC by conv, and data=0x01 represents configuration parameter success, and data=0x02 represents to there is communication failure.
Parameter is stored in the data FLASH of MCU inside by conv, after each conv powers on, just can read above-mentioned parameter successively from fixed position, if the parameter read is 0xff, represent and never carried out parameter downloads, light fault LED instruction, prompting user carries out the download of parameter.
Claims (7)
1. the conversion method of a general auto meter signal converter, described general auto meter signal converter, it comprises the inner MCU with data FLASH, the pulse acquisition circuit of adjustable frequency filtering, impulse output circuit and communication serial port, wherein the pulse acquisition circuit of adjustable frequency filtering gathers the rotational speed pulse signal of engine speed sensor and the vehicle speed pulse of car speed sensor respectively, after MCU process by impulse output circuit output speed impulse singla and vehicle speed pulse to the speed gage of gauge panel and average speed indicator; MCU is also communicated with PC by communication serial port simultaneously; Wherein, be provided with RC low-pass filter circuit in pulse acquisition circuit, RC low-pass filter circuit adopts fixed capacity and the adjustable digital potentiometer of resistance;
It is characterized in that, first download the engine speed sensor pulse count before and after reequiping, car speed sensor pulse count and diameter of tyres by communication serial port from PC, parameter configuration stores in the nonvolatile memory by conv; Conv is according to the frequency filtering of refiting engine tachogen pulse count adjustment tacho-pulse Acquisition Circuit, the frequency filtering of vehicle speed pulse Acquisition Circuit is adjusted according to repacking vehicle speed pulse sensor pulse number and diameter of tyres, then gather and calculation engine tachometer value and vehicle speed value, calculate according to tachometer value and former car engine tachogen pulse count and export the tacho-pulse mated with former car instrument, calculate according to vehicle speed value, former car car speed sensor pulse count and diameter of tyres and export the vehicle speed pulse mated with former car instrument.
2. conversion method as claimed in claim 1, it is characterized in that, its impulse rate switch process is:
Step 1) the pulse collection LPF threshold value of adjustment gauge signal converter pulse acquisition circuit, gather respectively and calculation engine tacho-pulse frequency and vehicle speed pulse frequency;
Step 2) calculate practical engine speeds and the speed of a motor vehicle;
Step 3) calculate and the tacho-pulse frequency of former car instrument adaptation and speed of a motor vehicle frequency, then export square-wave pulse to the speed gage of gauge panel and average speed indicator by the impulse output circuit of gauge signal converter, thus show correct rotating speed and the speed of a motor vehicle.
3. conversion method as claimed in claim 2, it is characterized in that, described step 1) in, when the pulse count of engine speed sensor and car speed sensor changes, the cutoff frequency of low-pass filter circuit needs respective change, now realized the adaptive pulse collection of LPF threshold value programmable by digital potentiometer adjustment low-pass cut-off frequencies, ensure the commonality of conv.
4. conversion method as claimed in claim 2, it is characterized in that, described step 2) in, being calculated as follows of engine speed and the speed of a motor vehicle: the actual interval of engine speed is [0,7000] rpm, the corresponding relation of its impulse rate Fengine and rotating speed and pulse count Nengine is:
Fengine=(engine speed/60) * Nengine (1-1)
Engine speed=(Fengine/Nenging) * 60 (1-2)
The actual interval of the speed of a motor vehicle is [0,240] km/h, its impulse rate Fcar and the speed of a motor vehicle, the corresponding relation of diameter of tyres D and pulse count Ncar is:
Fcar=(speed of a motor vehicle/(3.6*PI*D)) * Ncar (1-3)
The speed of a motor vehicle=(Fcar/Ncar) * PI*D*3.6 (1-4)
PI is circular constant constant;
The computing formula of the low-pass cut-off frequencies F of RC low-pass filter circuit is as follows:
F＝1/(2*PI*R*C)(1-5)
According to the resistance value of the RC low-pass filter circuit in maximum rotating speed/vehicle speed pulse set of frequency pulse collection, Fengine maxim is (7000/60) * Nengine, Fcar maxim is (240/ (PI*d)) * Ncar, the resistance value of the RC low-pass filter circuit in engine speed pulse collection is set, make low-pass cut-off frequencies F>Fengine maxim, the resistance value of the RC low-pass filter circuit in vehicle speed pulse collection is set, makes low-pass cut-off frequencies F>Fcar maxim;
Practical engine speeds and actual vehicle speed is obtained according to formula (1-2), (1-4), former car engine tachogen pulse count is substituted into formula (1-1), try to achieve the engine speed impulse rate with former car speed gage adaptation, former car car speed sensor pulse count and diameter of tyres are substituted into formula (1-3), tries to achieve the vehicle speed pulse frequency with former car average speed indicator adaptation.
5. conversion method as claimed in claim 1, it is characterized in that, described PC downloads engine speed sensor and car speed sensor pulse count and diameter of tyres configuration parameter by serial ports, download conv successfully configuration parameter to be stored in the data FLASH of MCU inside, download unsuccessful, conv Returning communication fault, prompting PC is downloaded again.
6. conversion method as claimed in claim 4, it is characterized in that, described PC and conv adopt the mode of fixed format message to communicate, and the unified employing of message format is as follows: heading (0x55+0xaa)+message ID+ message content+16 bit check with
ID, message direction of transfer and message content relation are corresponding as follows:
ID=1, data are byte, are sent to conv by PC, represent refiting engine tacho pulse number;
ID=2, data are byte, are sent to conv by PC, represent former car engine tacho pulse number;
ID=3, data are byte, are sent to conv by PC, represent repacking change speed gear box vehicle speed pulse number;
ID=4, data are byte, are sent to conv by PC, represent former car vehicle speed pulse number;
ID=5, data are double byte, are sent to conv by PC, represent repacking diameter of tyres;
ID=6, data are double byte, are sent to conv by PC, represent former vehicle tyre diameter;
ID=7, data are byte, are sent to PC by conv, and data=0x01 represents configuration parameter success, and data=0x02 represents to there is communication failure.
7. conversion method as claimed in claim 1, it is characterized in that, parameter is stored in the data FLASH of MCU inside by described conv, after each conv powers on, just can read above-mentioned parameter successively from fixed position, if the parameter read is 0xff, represents and never carried out parameter downloads, light fault LED instruction, prompting user carries out the download of parameter.
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| CN201210514254.6A CN102963256B (en) | 2012-12-05 | 2012-12-05 | A kind of general auto meter signal converter and conversion method thereof |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103407373A (en) * | 2013-08-02 | 2013-11-27 | 一汽解放柳州特种汽车有限公司 | Digital frequency dividing type vehicle speed signal control method and controller |
| CN104240334A (en) * | 2014-09-30 | 2014-12-24 | 长城汽车股份有限公司 | Pulse signal recorder for automobile and automobile detecting equipment |
| CN106153975A (en) * | 2016-07-05 | 2016-11-23 | 北汽福田汽车股份有限公司 | A kind of method, system and vehicle exporting vehicle speed pulse |
| CN106794813B (en) * | 2016-11-17 | 2019-07-05 | 深圳市锐明技术股份有限公司 | A kind of conversion match circuit of vehicle speed pulse level |
| CN108710936A (en) * | 2018-08-01 | 2018-10-26 | 广西玉柴机器股份有限公司 | Electrodeless variable engine signal panels number of teeth electronic commutator |
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| CN201083754Y (en) * | 2007-06-16 | 2008-07-09 | 福建省新虹润精密仪器有限公司 | Rotate speed instrument |
| CN201269881Y (en) * | 2008-10-06 | 2009-07-08 | 北汽福田汽车股份有限公司 | Frequency conversion device and vehicle assembled with the device |
| CN101704341A (en) * | 2009-11-13 | 2010-05-12 | 重庆长安汽车股份有限公司 | Combination meter for cars |
| CN202345532U (en) * | 2011-11-10 | 2012-07-25 | 长安大学 | Prompting device for automobile speed selection during downhill process |
| CN202499018U (en) * | 2012-03-02 | 2012-10-24 | 永州长怡汽车电子有限公司 | Combination instrument of automobile |
| CN202935174U (en) * | 2012-12-05 | 2013-05-15 | 山东省科学院自动化研究所 | Universal automobile instrument signal converter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201083754Y (en) * | 2007-06-16 | 2008-07-09 | 福建省新虹润精密仪器有限公司 | Rotate speed instrument |
| CN201269881Y (en) * | 2008-10-06 | 2009-07-08 | 北汽福田汽车股份有限公司 | Frequency conversion device and vehicle assembled with the device |
| CN101704341A (en) * | 2009-11-13 | 2010-05-12 | 重庆长安汽车股份有限公司 | Combination meter for cars |
| CN202345532U (en) * | 2011-11-10 | 2012-07-25 | 长安大学 | Prompting device for automobile speed selection during downhill process |
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