CN106707736A - Automobile instrument clock precision measuring method and automobile instrument clock precision measuring device - Google Patents
Automobile instrument clock precision measuring method and automobile instrument clock precision measuring device Download PDFInfo
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- CN106707736A CN106707736A CN201510788200.2A CN201510788200A CN106707736A CN 106707736 A CN106707736 A CN 106707736A CN 201510788200 A CN201510788200 A CN 201510788200A CN 106707736 A CN106707736 A CN 106707736A
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- utc
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- G—PHYSICS
- G04—HOROLOGY
- G04R—RADIO-CONTROLLED TIME-PIECES
- G04R20/00—Setting the time according to the time information carried or implied by the radio signal
- G04R20/02—Setting the time according to the time information carried or implied by the radio signal the radio signal being sent by a satellite, e.g. GPS
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0641—Change of the master or reference, e.g. take-over or failure of the master
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Electric Clocks (AREA)
- Synchronisation In Digital Transmission Systems (AREA)
Abstract
The invention discloses an automobile instrument clock precision measuring method and an automobile instrument clock precision measuring device. The device comprises a GPS module, a network module, and a measuring host. The GPS module and the network module communicate with the measuring host. The measuring host reads and writes the RTC (Real Time Clock) of an automobile instrument. The clock precision measuring method comprises the following steps: the GPS module acquires a GPS signal, and acquires UTC (Coordinated Universal Time) from the time frame information of the GPS signal; the network module acquires an NTP (Network Time Protocol) data message from a time server, and acquires NTP from the NTP data message; and the measuring host judges whether UTC or NTP is effective, takes effective UTC or NTP as a clock reference source, compares the clock reference source with RTC, and obtains and records a difference value. The time on a GPS satellite time and network time server is taken as a reference clock source. The error is calculated automatically through built-in software of the instrument. The accuracy of RTC precision measurement in the front period of instrument development is improved. Moreover, the device can be integrated with other automatic test equipment to realize uninterrupted record of data and improve test efficiency and precision.
Description
Technical field
The present invention relates to vehicle-mounted research and development field, more particularly to a kind of automobile instrument clock accuracy measuring method and device.
Background technology
The built-in RTC of automobile instrument (Real Time
Clock, real-time clock）Provide the user time and calendar function.Influenceed by environment temperature and crystal oscillator precision in practical application, RTC has certain timing error.In order to improve accuracy of timekeeping, it is necessary to measure the timing error of instrument in design early stage, and take measures to be corrected.
Traditional timing error measuring method is to allow instrument to be run for a long time in certain environment, reference standard clock source --- such as machine time, stopwatch times, speech chronopher platform etc..The time of measured instrument and standard clock source at the beginning and end of manual record test.The timing error of instrument is obtained by calculating the time difference at the beginning and end of both.But, there is following defect in this measuring method：
There is artificial error in reading in the 1st, hand-kept；
2nd, it is less efficient due to needing periodic logging data；
3rd, artificial operation automation level is low, is unfavorable for and error analysis integrated with existing measuring system.
The content of the invention
A kind of defect the invention aims to overcome above-mentioned background technology, there is provided the clock accuracy measuring method of automobile instrument.
The clock accuracy measuring method of the automobile instrument is based on UTC（Coordinated Universal Time, Coordinated Universal Time(UTC)）And NTP（Network Time Protocol, network time synchronization）Measured as timing reference input.Wherein UTC is gathered to gps data（Global
Positioning System, global positioning system).
A kind of clock accuracy measuring method of automobile instrument, including GPS module, mixed-media network modules mixed-media and measurement host；The GPS module and mixed-media network modules mixed-media communicate with the measurement host respectively, and the measurement host reads and writes the RTC of automobile instrument；Clock accuracy measuring method following steps：
The measurement host control control GPS module obtains gps signal, and therefrom in the time frame information of gps signal obtains UTC；
The measurement host controls the mixed-media network modules mixed-media to obtain the NTP data messages of time server, and obtains NTP from the NTP data messages；
Measurement host judges the validity of the UTC or described NTP, by the effective UTC or NTP as timing reference input, and the timing reference input is compared with the RTC, obtains and record difference；
Wherein, priority of the priority of the UTC higher than the NTP.
Further, in measurement process, when the timing reference input compared with the RTC fails, the RTC is then compared with the UTC or NTP not as timing reference input, until timing reference input recovers effective.
Further, after the timing reference input failure, measurement host then constantly tries to reacquire effective timing reference input.
Preferably, the measurement host synchronizes the RTC with the timing reference input before the RTC compares with shown timing reference input.
Preferably, the UTC is obtained and comprised the following steps：
GPS module is obtained and parses GPRMC messages in gps signal；
Read the data between first ", " and second ", " in GPRMC messages.
Preferably, the NTP is obtained and comprised the following steps：
Mixed-media network modules mixed-media parses NTP data messages, and records all timestamps in the NTP messages；
Using last timestamp as NTP.
In addition, invention additionally discloses a kind of clock accuracy measurement apparatus of automobile instrument, including：
GPS module, UTC is obtained for obtaining gps signal, and therefrom in the time frame information of gps signal；
Mixed-media network modules mixed-media, obtains the NTP data messages of time server, and obtains NTP from the NTP data messages；And
Measurement host, for UTC or NTP to be compared with the RTC of onboard instruments, and records difference；
The GPS module and mixed-media network modules mixed-media communicate with the measurement host respectively, and the measurement host reads and writes the RTC of automobile instrument.
Automobile instrument clock accuracy measuring method of the invention and device use the time on gps satellite time and network time server as reference clock source, and by the automatic calculation error of instrument embedded software.Substantially increase the degree of accuracy of the instrument exploitation early stage for RTC precision measures, using the automatic comparing calculation error of software, automatic output error result avoids the error that artificially record and may introduce, can be carried out with other automated test devices integrated, the uninterrupted recording of data is realized, testing efficiency and precision is improve.
Have that the degree of accuracy is high, testing efficiency is high compared to traditional manual testing's recording method, it is easy to the advantages of integrated with automation equipment.
Brief description of the drawings
Fig. 1 is the system architecture diagram of automobile instrument clock accuracy measurement apparatus of the invention.
The step of Fig. 2 is automobile instrument clock accuracy measuring method of the invention flow chart.
The step of Fig. 3 is the UTC acquisition methods of one embodiment of the invention flow chart.
The step of Fig. 4 is the NTP acquisition methods of one embodiment of the invention flow chart.
Specific embodiment
A kind of automobile instrument clock accuracy measuring method of the invention and device are further described below in conjunction with accompanying drawing.
A kind of automobile instrument clock accuracy measuring method, a kind of automobile instrument clock accuracy measurement apparatus provided using the present invention, based on UTC（Coordinated Universal Time, Coordinated Universal Time(UTC)）And NTP（Network Time Protocol, network time synchronization）Measured as timing reference input.As shown in figure 1, automobile instrument clock accuracy measurement apparatus specifically include GPS module, mixed-media network modules mixed-media and measurement host.
Wherein GPS module is used to obtain gps signal, and therefrom in the time frame information of gps signal obtains UTC.And mixed-media network modules mixed-media is then used to obtain the NTP data messages of time server, and NTP is obtained from the NTP data messages.Measurement host obtains the UTC of the GPS module and NTP of mixed-media network modules mixed-media, after UTC and NTP is obtained, UTC or NTP is compared with the RTC of onboard instruments, and record difference.Simultaneously measurement host the RTC of automobile instrument can also be read out or be write, it is ensured that before measuring the time can stringent synchronization, can accurately compare during measurement.
Specific automobile instrument clock accuracy measuring method is as shown in Figure 2.It is used as reference clock source by parsing the time frame message in gps data or ntp server time data.Contrast of the instrument clock with standard clock source and error calculation are realized in measurement process.Clock data is sent in Automatic Test Equipment by CAN, carries out analysis and the real time record of data.In situations where it is preferred, can also will in real time be shown the time difference by the built-in display module of instrument.So as to judge that the calibration of instrument clock RTC precision provides foundation for instrument designer.Compared with traditional hand-kept, the present invention is to the timely error measure high precisions of RTC, because timing reference input is using gps clock and network time server is in the absence of transmission delay or postpones minimum, do not receive external environment influence, without accumulated error, clock accuracy can be accurately measured under different temperature environments.Data automatic recording, does not have human error.
Specifically, S10. due to the priority of the priority higher than NTP of UTC, therefore need to verify the validity of UTC and NTP before test, control GPS module first obtains gps signal, judge whether gps signal is normal, if gps signal is normal, therefrom UTC is obtained in the time frame information of gps signal.And using UTC as timing reference input, for being compared with UTC.If gps signal is abnormal, it is judged to that gps signal fails, mixed-media network modules mixed-media is obtained the NTP data messages of time server, and NTP is obtained from the NTP data messages, using the NTP as timing reference input, for is compared with UTC.
In other embodiments, GPS module and mixed-media network modules mixed-media can be made to obtain UTC or NTP simultaneously, the suitable time is chosen as timing reference input further according to the situation and priority orders for obtaining.
S20. when determined behind clock reference source, measurement host waits the measurement instruction of user, and when user input measurement instruction, measurement host then starts measurement task, and by the RTC of timing reference input write-in automobile instrument now so that automobile instrument RTC is synchronous with timing reference input when measurement starts.
S30. after measurement starts, control main frame will implement the moment T2 of the moment T1 and instrument RTC for obtaining timing reference input, because the moment of timing reference input is obtained by communicating, it is not influenceed by the temperature of environment where instrument, under different temperature environments, the speed of the internal clocking of automobile instrument also can be different, on same time point, i.e. can be with the timing error of automobile instrument RTC, so as to obtain the precision of automobile instrument RTC by the difference for analyzing timing reference input moment T1 and automobile instrument RTC moment T2.
In a preferred embodiment, measurement to error amount can be shown by the display screen module of automobile instrument, while the timing error of RTC can be sent in other analytical instrument by bus communication being analyzed.
Under normal circumstances, the timing error of instrument is about ± 5 seconds/day, and error amount is relative and little.But the excursion of vehicle environment temperature is wider, in thermocycling, the error of RTC is very big, with reference to this test equipment and method, can efficiently record time error variation with temperature situation, and data are provided to person skilled.
When automobile instrument precision is measured, because GPS module and mixed-media network modules mixed-media also have built-in clock source, in the case that there is abnormal signal in reference clock reference source, the clock source that GPS module and mixed-media network modules mixed-media can call its own built-in is exported, and its built-in clock source is also under the environment temperature with automobile instrument equal state.Therefore it is that larger error also occurs.So, during reference clock source is in invalidating signal, the precision that measurement host or instrument will carry out RTC to automobile instrument using the time of non-timing reference input is calibrated.For example, when by the use of gps signal as reference clock source, once gps signal exception, measurement host or automobile instrument are continued to output the NTP obtained by the use of mixed-media network modules mixed-media as the reference clock source of substitute, the acquisition to gps signal is continuously attempted to simultaneously, until GPS module receives effectively gps signal, then timing reference inputs of the UTC as standard is switched to.It is synchronous that period need not carry out again to the RTC of automobile instrument and UTC.Because the built-in time source of GPS module can recover normal, and without accumulated error, have no effect on the measurement result to instrument RTC precision automatically and satellite time synchronization after gps signal recovery.Similarly, also can be using the UTC of GPS module as the timing reference input substituted when using the NTP of mixed-media network modules mixed-media as timing reference input.Ensure the reliability in measurement result.
In addition, in terms of the UTC in obtaining gps signal, the present invention provides a kind of acquisition scheme of UTC, including two steps, as shown in Figure 3：
S111. GPS protocol parsing；
S112. UTC time is extracted.
Specifically, including many information such as satellitosis, geographical coordinate, positioning precision, time in GPS protocol.The present invention only needs to use time frame information therein, and other information is all useless.By the NMEA-0183 protocol specifications for analyzing GPS, it is only necessary to obtain the temporal information in GPRMC frame messages.The structure of the GPRMC frame message sentences is as follows：
$GPRMC,<1>,<2>,<3>,<4>,<5>,<6>,<7>,<8>,<9>,<10>,<11>,<12>*hh
Therefore, sentence and receive GPRMC frame messages when detecting " $ " opportunity, wherein<1>I.e. the data in GPRMC messages between first ", " and second ", ", when UTC time is extracted, are read out and recorded by the time frame information of gps signal, obtain UTC time, it should be noted that the UTC time of acquisition is differed 8 hours with Beijing time.Need to add the corresponding time difference on this basis in output.In order to save system resource, record can be terminated in second ", " in reading GPRMC messages, complete to obtain.
And mixed-media network modules mixed-media obtains NTP aspects, it is specific as shown in figure 4, including：
S121. equipment networking is to reading NTC data messages on time server；
S122. parse time message and obtain the standard time.
Specifically, can confirm whether network unimpeded first, when determine network it is unimpeded after, can be to multiple time server address transmission data bags, to increase reliability.And then the time message on server is extracted in attachable multiple time servers.Preferably, the present embodiment time server different to 3 is attached.
Time message is in fact burst of data stream, it comprises multiple timestamps, it generally includes reference time, original time, four timestamps of reception time and transmission time, it is minimum in order to ensure the temporal information error that instrument is received, the delivery time therein is selected as the canonical reference time of instrument.So as to obtain accurate NTP.
Embodiments of the present invention are explained in detail above in conjunction with accompanying drawing, but the present invention is not limited to above-mentioned implementation method, in the ken that those of ordinary skill in the art possess, can also various changes can be made on the premise of present inventive concept is not departed from.
Claims (7)
1. the clock accuracy measuring method of a kind of automobile instrument, it is characterised in that including GPS module, mixed-media network modules mixed-media and measurement host；The GPS module and mixed-media network modules mixed-media communicate with the measurement host respectively, and the measurement host reads and writes the RTC of automobile instrument；Clock accuracy measuring method following steps：
The GPS module obtains gps signal, and therefrom in the time frame information of gps signal obtains UTC；
The mixed-media network modules mixed-media obtains the NTP data messages of time server, and obtains NTP from the NTP data messages；
Measurement host judges the validity of the UTC or described NTP, by the effective UTC or NTP as timing reference input, and the timing reference input is compared with the RTC, obtains and record difference；
Wherein, priority of the priority of the UTC higher than the NTP.
2. measuring method as claimed in claim 1, it is characterised in that in measurement process, when the timing reference input compared with the RTC fails, the RTC is then compared with the UTC or NTP not as timing reference input, until timing reference input recovers effective.
3. measuring method as claimed in claim 1, it is characterised in that after the timing reference input failure, measurement host then constantly tries to reacquire effective timing reference input.
4. measuring method as claimed in claim 1, it is characterised in that the UTC is obtained and comprised the following steps：
GPS module is obtained and parses GPRMC messages in gps signal；
Read the data between first ", " and second ", " in GPRMC messages.
5. independent lighting method as claimed in claim 1, it is characterised in that the NTP is obtained and comprised the following steps：
Mixed-media network modules mixed-media parses NTP data messages, and records all timestamps in the NTP messages；
Using last timestamp as NTP.
6. the measuring method as any one of claim 1-5, it is characterised in that the measurement host synchronizes the RTC with the timing reference input before the RTC compares with shown timing reference input.
7. clock accuracy measurement apparatus of a kind of automobile instrument, it is characterised in that including：
GPS module, UTC is obtained for obtaining gps signal, and therefrom in the time frame information of gps signal；
Mixed-media network modules mixed-media, obtains the NTP data messages of time server, and obtains NTP from the NTP data messages；And
Measurement host, for UTC or NTP to be compared with the RTC of onboard instruments, and records difference；
The GPS module and mixed-media network modules mixed-media communicate with the measurement host respectively, and the measurement host reads and writes the RTC of automobile instrument.
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| CN107919934A (en) * | 2017-11-20 | 2018-04-17 | 广州谨华电子科技有限公司 | A kind of clock and clock correcting method |
| CN109163755A (en) * | 2018-09-29 | 2019-01-08 | 惠州市德赛西威汽车电子股份有限公司 | A kind of vehicle entertainment system clock accuracy automatic testing method and system |
| CN111106890A (en) * | 2018-10-29 | 2020-05-05 | 中国移动通信有限公司研究院 | Method and equipment for time synchronization |
| CN111142359A (en) * | 2020-01-20 | 2020-05-12 | 许昌中科森尼瑞技术有限公司 | Method for realizing 5ms error time synchronization of electric power secondary equipment through communication |
| CN111669245A (en) * | 2020-05-29 | 2020-09-15 | 北京百度网讯科技有限公司 | Time synchronization method, device and equipment of vehicle and storage medium |
| CN112394634A (en) * | 2021-01-21 | 2021-02-23 | 国汽智控(北京)科技有限公司 | Time service method, device, equipment and storage medium for vehicle-mounted computing platform |
| CN112468172A (en) * | 2020-11-17 | 2021-03-09 | 常州仁千电气科技股份有限公司 | Vehicle-mounted network terminal TBOX |
| CN112769517A (en) * | 2021-01-14 | 2021-05-07 | 武汉光庭信息技术股份有限公司 | T-BOX time synchronization method and device |
| CN113890784A (en) * | 2021-09-30 | 2022-01-04 | 重庆长安新能源汽车科技有限公司 | Clock display method and system for vehicle-mounted combination instrument assembly |
| CN113890663A (en) * | 2021-09-24 | 2022-01-04 | 重庆长安新能源汽车科技有限公司 | Domain controller time synchronization management method and system and vehicle |
| CN113904748A (en) * | 2021-09-24 | 2022-01-07 | 济南浪潮数据技术有限公司 | Clock synchronization method, system, device and medium |
| CN114840335A (en) * | 2022-04-22 | 2022-08-02 | 北京斯年智驾科技有限公司 | Intelligent gateway controller in automatic driving field and multi-core division strategy thereof |
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| CN111142359A (en) * | 2020-01-20 | 2020-05-12 | 许昌中科森尼瑞技术有限公司 | Method for realizing 5ms error time synchronization of electric power secondary equipment through communication |
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| CN111669245A (en) * | 2020-05-29 | 2020-09-15 | 北京百度网讯科技有限公司 | Time synchronization method, device and equipment of vehicle and storage medium |
| CN112468172A (en) * | 2020-11-17 | 2021-03-09 | 常州仁千电气科技股份有限公司 | Vehicle-mounted network terminal TBOX |
| CN112769517A (en) * | 2021-01-14 | 2021-05-07 | 武汉光庭信息技术股份有限公司 | T-BOX time synchronization method and device |
| CN112769517B (en) * | 2021-01-14 | 2024-01-12 | 武汉光庭信息技术股份有限公司 | T-BOX time synchronization method and device |
| CN112394634A (en) * | 2021-01-21 | 2021-02-23 | 国汽智控(北京)科技有限公司 | Time service method, device, equipment and storage medium for vehicle-mounted computing platform |
| CN113890663A (en) * | 2021-09-24 | 2022-01-04 | 重庆长安新能源汽车科技有限公司 | Domain controller time synchronization management method and system and vehicle |
| CN113904748A (en) * | 2021-09-24 | 2022-01-07 | 济南浪潮数据技术有限公司 | Clock synchronization method, system, device and medium |
| CN113890784A (en) * | 2021-09-30 | 2022-01-04 | 重庆长安新能源汽车科技有限公司 | Clock display method and system for vehicle-mounted combination instrument assembly |
| CN114840335A (en) * | 2022-04-22 | 2022-08-02 | 北京斯年智驾科技有限公司 | Intelligent gateway controller in automatic driving field and multi-core division strategy thereof |
| CN114840335B (en) * | 2022-04-22 | 2023-10-27 | 北京斯年智驾科技有限公司 | Intelligent gateway controller in automatic driving field and multi-core division strategy thereof |
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