CN106249634A - A kind of real-time clock based on electric automobile data acquisition function - Google Patents
A kind of real-time clock based on electric automobile data acquisition function Download PDFInfo
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- CN106249634A CN106249634A CN201610899606.2A CN201610899606A CN106249634A CN 106249634 A CN106249634 A CN 106249634A CN 201610899606 A CN201610899606 A CN 201610899606A CN 106249634 A CN106249634 A CN 106249634A
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- time
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- real
- time clock
- electric automobile
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Electric Clocks (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention provides a kind of real-time clock based on electric automobile data acquisition function, it includes Big Dipper module, CAN transceiver, SD card circuit, real time clock circuit, processor unit；Described Big Dipper module is connected with processor unit interactive mode, and described CAN transceiver is connected with processor unit interactive mode, and SD card circuit is connected with processor unit interactive mode, and real time clock circuit is connected with processor unit interactive mode.The present invention provides the time error of the Big Dipper module of employing less, and after using satellite time, whole CAN network all uses satellite time, also makes the time synchronized of CAN system be guaranteed, and precision and the concordance of time are all significantly improved.
Description
Technical field
The present invention relates to technical field of new energy, a kind of height based on electric automobile data acquisition function
Precision real-time clock.
Background technology
In the control system of electric automobile, the node that controls of some bus needs an accurate unified clock, due to
CAN system belongs to dcs, the RTC clock that system node is built-in, is the most all to use
32.768KHz quartz oscillator, quartz oscillator produces a continuous print clock pulses, and RTC circuit is by frequency dividing
Obtaining the clock signal of 1Hz from 32.768kHz crystal oscillator, crystal can not provide degree of precision in wide temperature range,
Time deviation can be produced, deviation accumulation can time system time migration increasing, simultaneously because supply voltage deviation etc. because of
Element, also results in its clock jitter, in some cases, owing to vibration or backup battery voltage exhaust, makes clock circuit power-off,
The situations such as time and actual time that RTC clock circuit provides be inconsistent occur, ultimately results in bus system module (instrument, number
According to monitor, teledata module, drive recorder etc.) it is difficult to obtain unified clock.At electric automobile real-time data acquisition
Time, internal system needs a reliable and stable clock circuit, and when carrying out data record, processor needs to obtain and current is
The system time, and preserve after corresponding data interpolation time tag, after internal system time clock deviation occurs or lost efficacy, right
The collection of data and record, because not having ageing, cause the collection of data to lose meaning.
Summary of the invention
The invention provides a kind of real-time clock based on electric automobile data acquisition function, it includes Big Dipper mould
Block, CAN transceiver, SD card circuit, real time clock circuit, processor unit；
Described Big Dipper module is connected with processor unit interactive mode, and described CAN transceiver is with processor unit interactive mode even
Connecing, SD card circuit is connected with processor unit interactive mode, and real time clock circuit is connected with processor unit interactive mode.
It is preferred that described Big Dipper module receives satellite-signal, described satellite-signal includes that real-time time signal is believed with position
Number.
It is preferred that described Big Dipper module receives satellite-signal, time signal will be received and send described processor unit to,
This time signal is carried out synchronize with real time clock circuit by described processor unit, time signal is passed through CAN transceiver simultaneously
Other node being sent on CAN network, completes the time synchronized of CAN.
It is preferred that processor unit is by the CAN transceiver reception to the header length in CAN, and will receive
Information and Big Dipper module in time of sending, positional information process, preserved by SD card circuit after classification.
It is preferred that described processor unit is connected with SD card circuit by SPI interface, described SPI interface uses 4 line systems
Carry out data communication, when processor unit receives data and has packed data, trigger a write signal, processor list
Unit carries out communication by its hardware SPI interface and SD card circuit, and the present invention takes the mode temporally carrying out classifying, and per diem creates
One file, in the file of every day, the size of each file is less than 2MB byte, when file content is more than 2MB,
Close this document, again create a new file with current time and open it, after one time tag of write, subsequently
Write needs the data message preserved, and completes a secondary data write and the process preserved.
The method have the advantages that
The present invention provide real-time clock based on electric automobile data acquisition function due to Big Dipper module time
Between error less, use after satellite time, data acquisition unit can be avoided owing to the reasons such as crystal frequency, temperature, voltage error cause
System time build up error, meanwhile, whole CAN tennis all uses satellite time, also make CAN system time
Between synchronize to be guaranteed, precision and the concordance of time are all significantly improved.
Certainly, the arbitrary product implementing the present invention it is not absolutely required to reach all the above advantage simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, embodiment will be described required use below
Accompanying drawing is briefly described, it should be apparent that, the accompanying drawing in describing below is only some embodiments of the present invention, for ability
From the point of view of the those of ordinary skill of territory, on the premise of not paying creative work, it is also possible to obtain the attached of other according to these accompanying drawings
Figure.
Fig. 1 is the circuit block diagram of the real-time clock based on electric automobile data acquisition function that the present invention provides；
Fig. 2 is the read-write schematic flow sheet of the SD card that the present invention provides.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, those of ordinary skill in the art obtained under not making creative work premise all other
Embodiment, broadly falls into the scope of protection of the invention.
During as it is shown in figure 1, embodiments provide a kind of high-precision real based on electric automobile data acquisition function
Clock, including Big Dipper module, CAN transceiver, SD card circuit, real time clock circuit, processor unit；
Described Big Dipper module is connected with processor unit interactive mode, and described CAN transceiver is with processor unit interactive mode even
Connecing, SD card circuit is connected with processor unit interactive mode, and real time clock circuit is connected with processor unit interactive mode.
The present invention receives satellite-signal by Big Dipper module, and described satellite-signal includes that real-time time signal is believed with position
Number, send the real-time time signal received and position signalling to processor unit, processor unit by this information with in real time
The information of clock synchronizes, other node module simultaneously temporal information being sent in bus network by CAN, complete
Becoming CAN time synchronized, the information in bus is received targetedly by processor unit by CAN transceiver, and
The time signal sent in the information of reception and Big Dipper module, position signalling are processed, after classification, is saved in SD card
In circuit, it is achieved data storage writing function.
The Big Dipper module being connected with processor unit, includes an input front end and Big Dipper module UM220 III group
Becoming, input front end includes gps antenna, radio-frequency front-end low-noise amplifier, SAW filter, connects satellite-signal
Retractable is big, be input to UM220 III Big Dipper module after filtering, by UM220 III Big Dipper module by serial communication interface to
Reason device timing delivery time and position signalling, its signal transmits frequency can be carried out by serial communication interface by processor unit
Configuration, after processor unit receives the packet that UM220 III Big Dipper module is sended over by serial communication interface, right
Data are received and verify, if verification is correct, then by this time as current system time, simultaneously by these data
Synchronized update is to real time clock circuit.
The real time clock circuit that the embodiment of the present invention provides includes a RTC real-time clock module, RTC real-time clock module
It is an I2The clock module DS3231 of C bus, the integrated crystalline substance with temperature compensation function of this clock module chip internal
Oscillation body device and crystal, improve the long-term work degree of accuracy of device, and processor passes through I2C bus and DS3231 carry out communication,
Obtain the second, point, time, week, the date, the moon, year information.Clock module DS3231 is also equipped with time backup functionality simultaneously, works as vehicle
Travel in tunnel, culvert or when docking at place that underground garage etc. does not receives satellite-signal, Big Dipper module time information is lost
Losing, now, system then uses time that DS3231 real-time clock module provides as system time.
The SD card circuit that the embodiment of the present invention provides includes SD card, and it is connected with processor unit by SPI interface, SD
It is stuck in present daily life and uses widely in work, have become as the most general data storage card.Much setting
All use SD card as its storage device for upper.It is cheap, memory capacity is big, easy to use, versatility and high safety
Etc. advantage.SD card supports that SD mode is read and write with SPI mode.Wherein SD mode uses 6 line systems, SPI mode to use 4 line systems to count
According to communication.Data transmission bauds during SD mode and SPI mode want fast, use SPI mode to carry out with processor in this programme
Communication, when processor receives data and has packed data, triggers a write signal, and now, processor is hard by it
Part SPI interface and SD card carry out communication, are illustrated in figure 2 the read-write flow chart of SD card, in the recording process of data, in order to just
In data statistics and analysis, this programme takes the mode temporally carrying out classifying, and per diem creates a file, in every day
In file, the size of each file is less than 2MB byte, when file content is more than 2MB, closes this document, again to work as
The front time creates a new file and opens it, after one time tag of write, is subsequently written and needs data to be saved
Information, completes a secondary data write and the process preserved.
Needing the data receiving and preserving to lead to CAN transceiver to complete, processor unit is received always by CAN transceiver
Data, to needing the data receiving and preserving to be received, are then carried out point by the CAN message on line, and filter it
After class pretreatment, being saved in the caching of processor, when carrying out data and preserving, data are directly carried out by processor by caching
Extract, add the operational efficiency of system.
In order to realize the concordance of CAN system clock, processor unit is also by the second lock-out pulse of Big Dipper module
In conjunction with the timing of CAN interface to bus transmission time information, receive UM220 at processor unit by serial communication interface
While III Big Dipper module time information, it is same that UM220 III Big Dipper module exports a high-precision second also by hardware port
Pace pulse exports, and its precision is better than 50ns, and dutycycle is 50%, and 1PPS signal rising edge is time synchronized point.Second lock-out pulse
Output port is connected to the input capture port of processor, when this port captures a rising edge signal, triggers processor
Producing and interrupt, processor unit is information be sent to bus by CAN transceiver lock in time in interrupt service routine
On, completing bus clock and synchronize, in bus, other node is after receiving the CAN message of this time synchronized, carries out CAN transceiver and connects
Receive, and update the time of current system, complete the synchronized update to clock.
Due to the fact that the time error of Big Dipper module is less, use after satellite time, data acquisition unit can avoid due to
The system time that the reasons such as crystal frequency, temperature, voltage error cause builds up error, and meanwhile, whole CAN network is all adopted
With satellite time, also making the time synchronized of CAN system be guaranteed, precision and the concordance of time are all significantly improved.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.Preferred embodiment is the most detailed
Describe all of details, be also not intended to the detailed description of the invention that this invention is only described.Obviously, according to the content of this specification,
Can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is to preferably explain the present invention
Principle and actual application so that skilled artisan can be best understood by and utilize the present invention.The present invention is only
Limited by claims and four corner thereof and equivalent.
Claims (5)
1. a real-time clock based on electric automobile data acquisition function, it is characterised in that: include Big Dipper module,
CAN transceiver, SD card circuit, real time clock circuit, processor unit；
Described Big Dipper module is connected with processor unit interactive mode, and described CAN transceiver is connected with processor unit interactive mode, SD
Card circuit is connected with processor unit interactive mode, and real time clock circuit is connected with processor unit interactive mode.
2. real-time clock based on electric automobile data acquisition function as claimed in claim 2, it is characterised in that institute
Stating Big Dipper module and receive satellite-signal, described satellite-signal includes real-time time signal and position signalling.
Real-time clock based on electric automobile data acquisition function the most according to claim 1, it is characterised in that
To receive time signal and send described processor unit to, described processor unit is by this time signal and real time clock circuit
Synchronize, utilize other joint that time signal is sent on CAN network by CAN transceiver by second lock-out pulse simultaneously
Point, completes the time synchronized of CAN.
Real-time clock based on electric automobile data acquisition function the most according to claim 1, it is characterised in that
Processor unit passes through the CAN transceiver reception to the header length in CAN, and by the information received and Big Dipper module
In the time signal that sends, position signalling process, preserved by SD card circuit after classification.
Real-time clock based on electric automobile data acquisition function the most according to claim 1, it is characterised in that
Described processor unit is connected with SD card circuit by SPI interface, and described SPI interface uses 4 line systems to carry out data communication, when
After processor unit receives data and packed data, triggering a write signal, processor unit passes through its hardware SPI
Interface and SD card circuit carry out communication, and the present invention takes the mode temporally carrying out classifying, and per diem creates a file, often
In the file of day, the size of each file is less than 2MB byte, when file content is more than 2MB, closes this document, again
Create a new file with current time and open it, after one time tag of write, being subsequently written and need preservation
Data message, completes a secondary data write and the process preserved.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610899606.2A CN106249634A (en) | 2016-10-14 | 2016-10-14 | A kind of real-time clock based on electric automobile data acquisition function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610899606.2A CN106249634A (en) | 2016-10-14 | 2016-10-14 | A kind of real-time clock based on electric automobile data acquisition function |
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| Publication Number | Publication Date |
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| CN106249634A true CN106249634A (en) | 2016-12-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201610899606.2A Pending CN106249634A (en) | 2016-10-14 | 2016-10-14 | A kind of real-time clock based on electric automobile data acquisition function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112158358A (en) * | 2020-09-29 | 2021-01-01 | 西安应用光学研究所 | Data exchange and acquisition system for photoelectric pod |
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|---|---|---|---|---|
| EP1793301A1 (en) * | 2005-11-30 | 2007-06-06 | Thomson Licensing | Method and apparatus for providing a stable clock signal |
| CN201569905U (en) * | 2009-12-23 | 2010-09-01 | 中国电力科学研究院 | Real-time monitor terminal of electric automobile |
| CN103092066A (en) * | 2012-12-03 | 2013-05-08 | 国电联合动力技术有限公司 | Clock synchronization device and method used for fan control system |
| CN203490489U (en) * | 2013-08-26 | 2014-03-19 | 安徽安凯汽车股份有限公司 | Data acquisition unit for electric vehicle |
| CN204242257U (en) * | 2014-11-20 | 2015-04-01 | 山东广安电子科技股份有限公司 | LNG monitors automobile travel recorder |
-
2016
- 2016-10-14 CN CN201610899606.2A patent/CN106249634A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1793301A1 (en) * | 2005-11-30 | 2007-06-06 | Thomson Licensing | Method and apparatus for providing a stable clock signal |
| CN201569905U (en) * | 2009-12-23 | 2010-09-01 | 中国电力科学研究院 | Real-time monitor terminal of electric automobile |
| CN103092066A (en) * | 2012-12-03 | 2013-05-08 | 国电联合动力技术有限公司 | Clock synchronization device and method used for fan control system |
| CN203490489U (en) * | 2013-08-26 | 2014-03-19 | 安徽安凯汽车股份有限公司 | Data acquisition unit for electric vehicle |
| CN204242257U (en) * | 2014-11-20 | 2015-04-01 | 山东广安电子科技股份有限公司 | LNG monitors automobile travel recorder |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112158358A (en) * | 2020-09-29 | 2021-01-01 | 西安应用光学研究所 | Data exchange and acquisition system for photoelectric pod |
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Application publication date: 20161221 |
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