EP1462885A1 - Driftkompensationsverfahren für eine Uhr in einem Kraftfahrzeug - Google Patents

Driftkompensationsverfahren für eine Uhr in einem Kraftfahrzeug Download PDF

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Publication number
EP1462885A1
EP1462885A1 EP04290549A EP04290549A EP1462885A1 EP 1462885 A1 EP1462885 A1 EP 1462885A1 EP 04290549 A EP04290549 A EP 04290549A EP 04290549 A EP04290549 A EP 04290549A EP 1462885 A1 EP1462885 A1 EP 1462885A1
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EP
European Patent Office
Prior art keywords
frequency
clock
receiver
oscillator
temperature
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04290549A
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English (en)
French (fr)
Inventor
Alexandre Fromion
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PSA Automobiles SA
Original Assignee
Peugeot Citroen Automobiles SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peugeot Citroen Automobiles SA filed Critical Peugeot Citroen Automobiles SA
Publication of EP1462885A1 publication Critical patent/EP1462885A1/de
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G04—HOROLOGY
    • G04G—ELECTRONIC TIME-PIECES
    • G04G3/00—Producing timing pulses
    • G04G3/02—Circuits for deriving low frequency timing pulses from pulses of higher frequency

Definitions

  • the present invention relates to a drift compensation system of a clock of an oscillator clock system for a motor vehicle.
  • a clock of a motor vehicle is regularly updated on the basis of oscillations of an oscillator system of the type quartz oscillator.
  • the frequency of such oscillators is subject to variations. which depend on the operating conditions of the oscillator, such as temperature variations, wear or vibrations to which this oscillator.
  • the clock of the motor vehicle also shifts, no longer presenting precise time information.
  • a known method is to select for the clock system of the motor vehicle, a quartz oscillator which is characterized by a curve frequency drift in temperature in the form of an "S", which allows a relative compensation for temperature drift with a rotation point (change in sign of quartz frequency drift) calibrated at a temperature between + 25 ° C and + 30 ° C. This compensates on average positive and negative frequency drifts. It results from this type of correction significant energy consumption, especially when the vehicle is stop and off, and despite everything a significant drift of the time depending on the stable climatic conditions.
  • quartz oscillator device compensated for temperature by numerical control like that marketed under the name “DS4000” from the company “Maxim Integrated Product Inc.” based in Sunnyvalley, California, USA.
  • This device comprises a quartz oscillator whose drifts in frequency are corrected on the basis of temperature measurements by a digital temperature sensor and a frequency drift model in factory calibrated temperature.
  • Such a device does not correct errors due to variation parameters of the frequency drift model of the temperature oscillator during the life cycle of this oscillator since the parameters are calibrated only once at the start of using it. Clock drift can then appear and cannot be corrected automatically.
  • the object of the present invention is to solve the above-mentioned problems.
  • the compensation system according to the invention is characterized in that the registration means are suitable for regularly reset the clock based on the time reference signal when the receiver of the global positioning system by satellites is active.
  • the compensation system according to the invention is characterized in that the registration means are adapted to calculate at a given first frequency 1 / T e , when the receiver of the global positioning system by satellite is inactive, a number of time units to add to a time unit counter, based on the estimated frequency drift of the quartz oscillator.
  • the compensation system according to the invention is characterized in that when the receiver of the positioning system global by satellites is inactive, the registration means are adapted to periodically reset, at a given second frequency, the clock by adding the value of the time units counter to the clock.
  • the compensation system according to the invention is characterized in that the time unit counter includes a positioning system receiver clock system pulse counter global by satellites.
  • the compensation system according to the invention is characterized in that when the receiver of the positioning system global by satellites is inactive, the registration means are adapted to reset the clock when the positioning system receiver is activated global by satellites by adding the value of the time units counter to the clock.
  • the compensation system according to the invention is characterized in that the time unit counter includes a drift accumulator.
  • the compensation system is characterized in that the information processing means are trained by the positioning system receiver processing processor global by satellites.
  • a motor vehicle 1 is shown diagrammatically which is provided a clock system comprising a clock 2 and a receiver 3 of a system positioning by conventional type satellites.
  • the oscillator of the clock system of the motor vehicle is that of receiver 3 of the global positioning system by satellites (GPS receiver in the following description) which allows you to do the economy of a specific oscillator for the clock system.
  • phase during which the GPS receiver 3 is active i.e. able to receive and process at least one signal GPS 5a of at least one satellite 5 of the global positioning system by satellites and deliver to the rest of the system a signal 6 corresponding to a reference time
  • phase during which the GPS receiver 3 is inactive i.e. able to receive and process at least one signal GPS 5a of at least one satellite 5 of the global positioning system by satellites and deliver to the rest of the system a signal 6 corresponding to a reference time
  • the 3 GPS receiver When the 3 GPS receiver is active, it receives at least one satellite 5 of the global positioning system by satellites, a GPS signal 5a to one pulse per second. This GPS signal 5a with a period of 1 second is then processed and delivered in the form of the time reference signal 6 by means 7 transmission to an information processing unit 8 responsible for updating the clock 2 of the clock system thanks to a unit 9 for resetting the clock 2 which uses this signal 6 delivered by the GPS receiver 3 to update the clock 2 every second.
  • an information processing unit 8 responsible for updating the clock 2 of the clock system thanks to a unit 9 for resetting the clock 2 which uses this signal 6 delivered by the GPS receiver 3 to update the clock 2 every second.
  • the signal 6 is also used as a time reference period of 1 second by means 10 for determining the frequency drift function in temperature of the quartz oscillator 4.
  • These means 10 determine the set of parameters a, b, c of the function described in equation (2) and therefore the set of parameters ⁇ 0 , T 0 and K of the function described in equation (1).
  • the determination means 10 use a discrete digital algorithm (that is to say sampled in time) of iterative estimation, operating at a period T r which may correspond to that of the time reference.
  • the choice of the period T r depends on the calculation capacity of the circuit implementing the invention. It is possible, from the time reference signal, to obtain signals of frequency less than 1 Hz by the use, for example, of a frequency divider.
  • This algorithm implements two stages, namely a first step corresponding to a step called “innovation” to calculate an error estimation and a second step corresponding to a step called “estimation To update estimated parameters.
  • the estimation error corresponds to the error that exists between the measurement of the frequency of the quartz oscillator 4 and the estimation of this same frequency on the basis of the measurement of the temperature and the value of the estimated parameters.
  • the measurement y (kT r ) is carried out by the means 12 for measuring the frequency, for example, counting on the time interval defined by two successive pulses of the time reference signal 6, that is to say between the sampling instants ( k - 1) T r and kT r , the number of pulses delivered by the quartz oscillator 4 which thus makes it possible to deduce its frequency.
  • ⁇ it can be for example a value initially determined in the factory.
  • the value of ⁇ and stored in the storage means 13 can be used as the initial value.
  • the second operating phase of the system according to the invention is the phase during which the GPS receiver 3 is inactive.
  • this one When this one is inactive, it no longer processes a signal from at least one satellite in the system of global positioning by satellites and the clock 2 is updated so classic thanks to the quartz oscillator 4 and is therefore subject to an offset due to the frequency drift of the quartz oscillator 4 due to variations of temperature.
  • the value of ⁇ and stored in the storage means 13 is then used by means 14 for estimating the frequency drift of the oscillator to estimate the value of the frequency drift in temperature of the oscillator at quartz 4 which is subsequently used to compensate for the drift of clock 2 induced by said estimated frequency drift.
  • adding a number of pulses to the clock means adding a number of positive or negative pulses to the clock since ⁇ I can be positive if the estimated frequency of the quartz oscillator 4 is less than the nominal frequency and negative if the estimated frequency of the quartz oscillator 4 is greater than the nominal frequency and a pulse corresponds to 1 / f n second.
  • This compensation is obtained by using a counter 15 pulses whose operation is described below.
  • the first operating mode is described by the flowchart of FIG. 2, and consists in recovering every T e seconds at a block 20 the value of ⁇ and ( T ( kT e )) calculated by the estimation means 14.
  • the value of the clock drift ⁇ H corresponding to the value of f and (T (kT e )) and the number of associated clock pulses ⁇ I are then calculated, which is then added to the 15 pulse counter.
  • a test is carried out to find out whether the value of a counter C of the information processing unit 8 is equal to a predetermined value T d , for example 60, which corresponds to one minute for T e equal to one second.
  • T d 1, which means that the compensation for clock drift is carried out every T e seconds.
  • the clock system of the GPS receiver 3 contains in a conventional manner a pulse counter connected to the quartz oscillator 4 which it is possible to choose as the pulse counter 15 of the present invention in this first mode of operation.
  • the second mode of operation of the registration means 9 during the standby phase of the GPS receiver 3 is described by the flowchart of FIG. 3 and consists in recovering every T th seconds at a block 30 the value of ⁇ and ( T ( kT e )) calculated by the estimation means 14.
  • the value of the clock drift ⁇ H corresponding to this value is then calculated and the associated number of pulses ⁇ I which are added to the counter 15 of pulses.
  • a test is carried out to find out whether the GPS receiver 3 has been activated. If this result is positive, in a block 33, the number of pulses to the clock corresponding to the value of the counter of pulses 15 is added.
  • the pulse counter 15 is reset and we go to active phase of operation of the clock system according to the invention. If the result of the test is negative, we then return to block 30.
  • the pulse counter 15 used in this second mode of operation then has the function of drift accumulator and is suitable for store the total clock drift during the phase during which the receiver 3 GPS is inactive.
  • the registration means 9 can be produced by a wired circuit which receives the number of pulses to be added per minute to the clock, and distributes them over a minute or by a processing processor like that of GPS or whatever other.
  • This invention makes it possible to use widely used components such as quartz oscillators with parabolic frequency drift functions. Furthermore the automatic compensation for motor vehicle clock drifts allows increase the tolerances on the oscillator quartz and allows to maintain high accuracy even after a long period of inactivity and variation parameters of the frequency drift function of the oscillator. Through elsewhere, this compensation system has an electrical consumption reduced and the required calculations consume little computing power which easily allows the means of the invention to be integrated into the processor GPS receiver management. Finally, the means of the invention can be integrated in whole or in part to the component which performs the real-time clock function of the GPS receiver.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Electric Clocks (AREA)
EP04290549A 2003-03-25 2004-03-01 Driftkompensationsverfahren für eine Uhr in einem Kraftfahrzeug Withdrawn EP1462885A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0303653 2003-03-25
FR0303653A FR2853093B1 (fr) 2003-03-25 2003-03-25 Systeme de compensation des derives d'une horloge pour vehicule automobile

Publications (1)

Publication Number Publication Date
EP1462885A1 true EP1462885A1 (de) 2004-09-29

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ID=32799741

Family Applications (1)

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EP04290549A Withdrawn EP1462885A1 (de) 2003-03-25 2004-03-01 Driftkompensationsverfahren für eine Uhr in einem Kraftfahrzeug

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EP (1) EP1462885A1 (de)
FR (1) FR2853093B1 (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2469192A (en) * 2009-03-27 2010-10-06 Sirf Tech Inc Managing power consumption in devices incorporating GPS receivers
EP2120343A3 (de) * 2008-04-14 2010-12-15 PGS Onshore, Inc. Dithering-Steuerung einer Oszillatorfrequenz zur Verringerung kumulativer Taktfehler bei einem Taktgeber
US8185083B2 (en) 2009-03-30 2012-05-22 Csr Technology Inc. Systems and methods for managing power consumption
US9322925B2 (en) 2009-03-27 2016-04-26 Qualcomm Technologies International, Ltd. Systems and methods for managing power consumption
WO2018184640A1 (de) * 2017-04-05 2018-10-11 Continental Teves Ag & Co. Ohg Verfahren zum betreiben eines unfalldatenspeichers für ein kraftfahrzeug und unfalldatenspeicheranordnung
EP3611577A1 (de) * 2018-08-17 2020-02-19 Continental Automotive GmbH Tachograph und verfahren zum regeln einer internen zeit des tachographen
CN113630115A (zh) * 2021-08-06 2021-11-09 硅谷数模(苏州)半导体有限公司 时钟频率的校准方法、校准装置和时钟频率校正系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4448543A (en) * 1983-01-17 1984-05-15 Rockwell International Corporation Time-of-day clock having a temperature compensated low power frequency source
US5848355A (en) * 1993-07-07 1998-12-08 Motorola, Inc. Frequency synthesizer correction using a temperature responsive divisor control
US5940027A (en) * 1997-09-30 1999-08-17 Rockwell International Corporation High accuracy low power GPS time source
US6081163A (en) * 1999-01-22 2000-06-27 Advantest Corp. Standard frequency and timing generator and generation method thereof
WO2001088635A2 (en) * 2000-05-16 2001-11-22 Ericsson Inc Methods, systems, wireless terminals, and computer program products for calibrating an electronic clock using a base reference signal and a non-continuous calibration reference signal having greater accuracy than the base reference signal

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4448543A (en) * 1983-01-17 1984-05-15 Rockwell International Corporation Time-of-day clock having a temperature compensated low power frequency source
US5848355A (en) * 1993-07-07 1998-12-08 Motorola, Inc. Frequency synthesizer correction using a temperature responsive divisor control
US5940027A (en) * 1997-09-30 1999-08-17 Rockwell International Corporation High accuracy low power GPS time source
US6081163A (en) * 1999-01-22 2000-06-27 Advantest Corp. Standard frequency and timing generator and generation method thereof
WO2001088635A2 (en) * 2000-05-16 2001-11-22 Ericsson Inc Methods, systems, wireless terminals, and computer program products for calibrating an electronic clock using a base reference signal and a non-continuous calibration reference signal having greater accuracy than the base reference signal

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2120343A3 (de) * 2008-04-14 2010-12-15 PGS Onshore, Inc. Dithering-Steuerung einer Oszillatorfrequenz zur Verringerung kumulativer Taktfehler bei einem Taktgeber
GB2469192A (en) * 2009-03-27 2010-10-06 Sirf Tech Inc Managing power consumption in devices incorporating GPS receivers
GB2469192B (en) * 2009-03-27 2013-08-28 Sirf Tech Inc Systems and methods for managing power consumption
US9322925B2 (en) 2009-03-27 2016-04-26 Qualcomm Technologies International, Ltd. Systems and methods for managing power consumption
US8185083B2 (en) 2009-03-30 2012-05-22 Csr Technology Inc. Systems and methods for managing power consumption
US9176234B2 (en) 2009-03-30 2015-11-03 Qualcomm Technologies International, Ltd. Systems and methods for managing power consumption
WO2018184640A1 (de) * 2017-04-05 2018-10-11 Continental Teves Ag & Co. Ohg Verfahren zum betreiben eines unfalldatenspeichers für ein kraftfahrzeug und unfalldatenspeicheranordnung
DE102017205793A1 (de) * 2017-04-05 2018-10-11 Continental Teves Ag & Co. Ohg Verfahren zum Betreiben eines Unfalldatenspeichers für ein Kraftfahrzeug und Unfalldatenspeicheranordnung
US11636718B2 (en) 2017-04-05 2023-04-25 Continental Teves Ag & Co. Ohg Method for operating a motor vehicle accident data memory and accident data memory system
EP3611577A1 (de) * 2018-08-17 2020-02-19 Continental Automotive GmbH Tachograph und verfahren zum regeln einer internen zeit des tachographen
CN113630115A (zh) * 2021-08-06 2021-11-09 硅谷数模(苏州)半导体有限公司 时钟频率的校准方法、校准装置和时钟频率校正系统
CN113630115B (zh) * 2021-08-06 2024-03-29 硅谷数模(苏州)半导体股份有限公司 时钟频率的校准方法、校准装置和时钟频率校正系统

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Publication number Publication date
FR2853093A1 (fr) 2004-10-01
FR2853093B1 (fr) 2005-09-30

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