CN102520608A - Method and device for automatically correcting automobile vehicle-mounted clock - Google Patents
Method and device for automatically correcting automobile vehicle-mounted clock Download PDFInfo
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Abstract
The invention relates to a method for automatically correcting an automobile vehicle-mounted clock. The method comprises the following steps of: obtaining a current time deviation value of the vehicle-mounted clock within unit time; accumulating the time deviation value with a value in a specified register, and storing the accumulation result in the register; judging whether the numerical value stored in the register reaches a first set time value, if so, executing the next step, otherwise, returning back to the first step; acquiring the current time of the clock, interpolating the first set time value on the time, and then, returning back the value to the clock; subtracting the first set time value from the value in the specified register, and storing the result in the specified register and returning back to the first step. The invention further relates to a device for realizing the method. The implementation of the method and the device for automatically correcting the automobile vehicle-mounted clock of the invention causes the following the benefits of: avoiding or reducing manual regulation on the clock, and making the clock to be more convenient to use.
Description
Technical field
The present invention relates to vehicle electric field, more particularly, relate to a kind of method and device that shows from the automobile mounted clock of NMO correction.
Background technology
Along with economical and technological development; Electronic product obtains using comparatively widely on auto industry, wherein, and in general; In the automotive electronics except the instrument display device of parameter, state and the multifunctional and multipurpose of representing various automobiles; All also be provided with a kind of electronic clock, it is that numeral is presented on the display screen with time representation, supplies the user to use.Traditional auto clock display screen, the composition of its internal circuit is comparatively fixing, all clock oscillator must be arranged; This oscillator produces the standard of pulse as timing; To its step-by-step counting, and obtain representing the numeral of current time through processor, and then should numeral on display screen, show.What these clock oscillators were common is crystal oscillator.Because the inherent characteristic of crystal in the crystal oscillator, be-0.04 * 10 in the error of high and low temperature state
-6/ ℃
2, can not satisfy the degree of accuracy of clock timing, the performance plot of crystal oscillator (seeing also Fig. 1).Like this, owing to the difference of temperature causes the pulse change of crystal oscillator, possibly occur in some cases that the timing of every day is slack-off to surpass 10 seconds, timing in every month is slack-off surpasses 5 minutes for accumulative total.Like this, in order to guarantee the accuracy of clock timing, just must readjust clock and show through manual work.This has brought bigger inconvenience to the user.
Summary of the invention
The technical matters that the present invention will solve is; To prior art above-mentioned since Influence of Temperature make clock become inaccurate, to the defective that the user makes troubles, provide a kind of and can eliminate automatically because method and the device that the clock that temperature variation is brought is inaccurate, the user is easy to use shows from the automobile mounted clock of NMO correction.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of method from the automobile mounted clock of NMO correction, comprise the steps:
A) ambient temperature value that obtains current vehicle-mounted clock place in the unit interval is also according to said ambient temperature value, and the crystal oscillation frequency of searching and obtaining in its corresponding unit interval changes the time deviation value that brings;
B) with said time deviation value with specify value in the register to add up and be stored in this register;
Whether the numerical value of C) judging said appointment register-stored reaches first time value set, in this way, carries out next step, otherwise returns steps A);
D) obtain the present clock time, and after said first time value set of interpolation on this time, this value is returned clock;
E) value in the said appointment register deducts said first time value set, stores in the said appointment register; Return steps A).
Of the present invention in the method for the automobile mounted clock of NMO correction, said steps A) in further comprise:
A1) in the unit interval, obtain the magnitude of voltage of representing environment temperature according to the SF of setting;
A2) the said magnitude of voltage of obtaining of foundation is tabled look-up and is obtained the ambient temperature value of its representative;
A3) the said ambient temperature value that obtains of foundation is tabled look-up and is obtained the time deviation value in this following unit interval of temperature.
Of the present invention in the method for the automobile mounted clock of NMO correction, said steps A 3) in further comprise:
A31) table look-up according to the said ambient temperature value that obtains and obtain under this temperature the deviation value of crystal oscillation frequency under the crystal oscillation frequency and standard temperature;
A32) said frequencies deviation value and unit interval multiply each other and obtain the time deviation value in the said following unit interval of temperature.
In the method for the automobile mounted clock of NMO correction, said first time value set is 1 second, said step C of the present invention) in judge in the said appointment register that whether time value totally is greater than 1 second.
Of the present invention in the method for the automobile mounted clock of NMO correction, said step D) in, further comprise the steps:
D1) obtain the current time value of clock;
D2) on the current time value, directly increase by first time value set;
D3) time value after will regulating is returned clock as the current time value and is shown.
Of the present invention in the method for the automobile mounted clock of NMO correction, said step e) in, further comprise the steps:
E1) obtain the absolute value of numerical value in the said appointment register;
E2) in the said absolute value of obtaining, deduct first time value set and the surplus value that obtains returned said appointment register as absolute value.
The invention still further relates to a kind of device of realizing said method, comprising:
The time deviation value is obtained the unit: be used to obtain the ambient temperature value at current vehicle-mounted clock place in the unit interval and according to said ambient temperature value, search and obtain the time deviation value that the crystal oscillation frequency variation in its corresponding unit interval brings;
Time deviation value accumulative total unit: be used for said time deviation value with specify value in the register to add up and be stored in this register;
Time deviation value judging unit: be used to judge whether the numerical value of said appointment register-stored reaches first time value set;
Present clock is obtained and regulon: be used to obtain the present clock time, and after said first time value set of interpolation on this time, this value returned clock;
The time deviation value is removed the unit: the value that is used for said appointment register deducts said first time value set, stores in the said appointment register.
In device of the present invention, said time deviation value is obtained the unit and is further comprised:
Magnitude of voltage is obtained module: be used in the unit interval, obtaining the magnitude of voltage of representing environment temperature according to the SF of setting;
Ambient temperature value obtains module: be used for tabling look-up and obtaining the ambient temperature value of its representative according to the said magnitude of voltage of obtaining;
The time deviation value is obtained module: be used for tabling look-up and obtaining the time deviation value in this following unit interval of temperature according to the said ambient temperature value that obtains.
In device of the present invention, said time deviation value is obtained module and is further comprised:
The oscillation frequency deviation value is obtained submodule: being used for tabling look-up according to the said ambient temperature value that obtains obtains under this temperature the deviation value of crystal oscillation frequency under the crystal oscillation frequency and standard temperature;
The time deviation value is obtained submodule: being used for multiplying each other according to said frequencies deviation value and unit interval obtains the time deviation value in the following unit interval of said temperature.
In device of the present invention, said present clock is obtained and regulon further comprises:
Current time is obtained module: the current time value that is used to obtain clock;
Current time adjustment module: on the current time value, directly increase by first time value set;
Current time is returned module: be used for the time value after regulating is returned clock and demonstration as the current time value.
The method and the device from the automobile mounted clock demonstration of NMO correction of embodiment of the present invention; Has following beneficial effect: owing to the oscillation frequency error that obtains crystal oscillator in the unit interval through detection to environment temperature; Then obtain the time deviation value of clock timing under this frequency, and the clock demonstration is regulated and returned to the time value that when above-mentioned time deviation value is accumulated to first time value set, directly clock is shown.Depart from so it can regulate the time that brings owing to the temperature difference automatically, comparatively exactly, thereby use no or little the manual shift clock, it is comparatively convenient to use.
Description of drawings
Fig. 1 is the synoptic diagram of the oscillation frequency of crystal oscillator with its variation of ambient temperature;
Fig. 2 is the present invention in method that the automobile mounted clock of NMO correction shows and device embodiment from the automobile mounted clock display packing of NMO correction process flow diagram;
Fig. 3 be among the said embodiment time deviation value obtain process flow diagram;
Fig. 4 is the process flow diagram of obtaining the current time among the said embodiment and regulating;
Fig. 5 is the structural representation that installs among the said embodiment;
Fig. 6 is the hardware configuration synoptic diagram among the said embodiment.
Embodiment
To combine accompanying drawing that the embodiment of the invention is described further below.
As shown in Figure 2, in method and device embodiment that the automobile mounted clock of NMO correction shows, its method that realizes that the automobile mounted clock of automatic correction shows comprises the steps: in the present invention
Step S11 obtains in the unit interval and changes the time deviation value of bringing owing to temperature variation causes crystal oscillator frequency: as previously mentioned; The variation of environment temperature can cause changing as the oscillation frequency of the crystal oscillator of timing signal of clock, and then causes the time of clock deviation to occur.In this step, with the unit interval be a time period, obtain under Current Temperatures the deviate that occurs in this internal clock time time period.In the present embodiment, the above-mentioned unit interval is 60 seconds.
Step S12 is the above-mentioned time deviation value of accumulative total in specifying register: in this step; The time deviation value that above-mentioned steps is obtained adds up in specifying register; That is to say; The digital addition of the deviate that occurs in a period of time originally in specifying register, to exist, and store into once more in this appointment register.Certainly, when bringing into operation in system, this appointment register will carry out zero clearing in initialization procedure; In addition, the numerical value in this appointment register can be by zero clearing.
Is the time deviation value of step S13 accumulative total greater than first time value set? Carry out next step in this way, otherwise, step S11 returned; In this step, if the time deviation of specifying accumulative total in the register greater than first time value set, execution in step S14 then; Otherwise, be judged as also and need do not regulate clock time, jump to step S11, continue to obtain time deviation and continue this deviation of accumulative total.In the present embodiment, above-mentioned first time value set is 1 second, and this is the minimum scalable unit of clock time, the adjusted accurate maintenance that helps the time.
Step S14 obtains the current time; And after directly regulating first time value set on the current time, return clock and be worth: in this step as the current time; Obtain the current time value of clock, and this current time value is regulated first time value set, afterwards; Time value after regulating is returned clock as the current time value, make clock on the time value after the adjusting, show and continue timing.What deserves to be mentioned is, in this step, be directly in the current time adjusted that obtains, and just directly will add one second the current time.
Step S15 deducts first time value set and surplus value is returned the appointment register in above-mentioned appointment register: in this step; Because above-mentioned steps S14 has regulated one first setting-up time to the present clock time, that is to say, in the time deviation that in specifying register, adds up; There has been one first setting-up time to be conditioned; So, in this step, need to specify the accumulated time deviation in the register to deduct one first time value set; And deposit remaining time deviation in above-mentioned appointment register again, add time deviation accumulative total next time.
As shown in Figure 3, in above-mentioned steps, step S11 has further comprised:
Step S21 obtains the magnitude of voltage of a plurality of expression current environmental temperature according to the frequency of setting in the unit interval; And obtain its mean value: in this step; Microprocessor was sampled to the magnitude of voltage of its external temperature sensor output according to the SF of setting in the unit interval; Obtain a plurality of sampled values, after the above-mentioned unit interval reaches, above-mentioned a plurality of sampled values are averaged; Obtain the temperature sensor output voltage values in the unit interval, this value representation the environment temperature in the unit interval.In the present embodiment, the above-mentioned unit interval is 60 seconds, and in these 60 seconds, microprocessor may be obtained the different voltages with different value, and it is averaged can reflect the environment temperature in this unit interval comparatively exactly.
Step S22 tables look-up according to said mean value and obtains the temperature value of its representative: in this step, according to above-mentioned magnitude of voltage, table look-up, obtain the corresponding ambient temperature value of this value.
Step S13 tables look-up and obtains the deviation value of the oscillation frequency under the oscillation frequency and standard temperature under the said temperature value: in this step; Owing to learnt current environment temperature, thus can table look-up obtain under this temperature oscillator oscillation frequency with as standard value+25 the deviates (seeing also Fig. 1) of oscillation frequency under spending.
Step S24 calculates the time deviation value in the unit interval according to the deviation value of above-mentioned oscillation frequency: in above-mentioned steps; Obtained the exemplary frequency deviation values under this temperature; The inverse and the unit interval of this exemplary frequency deviation values are multiplied each other; Just obtain in the unit interval time deviation value of clock time.
In addition, as shown in Figure 4, in step S14, further comprised following steps:
Step S31 obtains its current time value by clock: in this step, obtain current clock time by clock (clock circuit), this time is exactly that clock is presented at the numerical value on the display screen.
Step S32 increases by first time value set on above-mentioned current time value: in this step; The above-mentioned current time of obtaining is directly regulated one first setting-up time; This first setting-up time is 1 second in the present embodiment, and this also is the minimum scalable unit of clock time.Usually, above-mentioned clock time all is that the correct time of reality is slow, so generally be on the present clock time value, to increase by first time value set;
Step S33 returns amended time value to clock as the current time value: in this step, the time value after the above-mentioned adjusting is returned clock as the current time value, and on clock, show.
In the present embodiment, also disclosed a kind of device of realizing said method, its structure is as shown in Figure 5.This device has comprised that the time deviation value is obtained unit 1, time deviation value accumulative total unit 2, time deviation value judging unit 3, present clock is obtained and regulon 4 and time deviation value are removed unit 5; Wherein, the time deviation value is obtained ambient temperature value and the said ambient temperature value of foundation that unit 1 is used to obtain current vehicle-mounted clock place in the unit interval, and the crystal oscillation frequency of searching and obtaining in its corresponding unit interval changes the time deviation value that brings; Time deviation value accumulative total unit 2 be used for said time deviation value with specify value in the register to add up and be stored in this register; Time deviation value judging unit 3 is used to judge whether the numerical value of said appointment register-stored reaches first time value set; Present clock is obtained and regulon 4 is used to obtain the present clock time, and after said first time value set of interpolation on this time, this value is returned clock;
The time deviation value is removed the value that unit 5 is used for said appointment register and is deducted said first time value set, stores in the said appointment register.
In the present embodiment, the time deviation value is obtained unit 1 and further comprised: the magnitude of voltage that is used in the unit interval obtaining according to the SF of setting the magnitude of voltage of expression environment temperature is obtained module 11; Be used for obtaining module 12 according to the table look-up ambient temperature value of the ambient temperature value that obtains its representative of the said magnitude of voltage of obtaining; Be used for obtaining module 13 according to the said ambient temperature value that the obtains time deviation value that obtains the time deviation value in this following unit interval of temperature of tabling look-up.And the time deviation value is obtained module 13 and comprised: being used for tabling look-up according to the said ambient temperature value that obtains obtains under this temperature under the crystal oscillation frequency and standard temperature the oscillation frequency deviation value of the deviation value of crystal oscillation frequency and obtains submodule 131 and be used for obtaining submodule 132 according to said frequencies deviation value and the unit interval time deviation value that obtains the time deviation value in the following unit interval of said temperature that multiplies each other.
In addition, in the present embodiment, above-mentioned present clock is obtained and regulon 4 further comprises: the current time that is used to obtain the current time value of clock is obtained module 41; Be used on the current time value, directly increasing the current time adjustment module 42 of first time value set; The current time that time value after being used for regulating is returned clock and demonstration as the current time value is returned module 43.
Above-mentioned each unit, module are and realize in the present embodiment software function module of each corresponding steps in the vehicle-mounted clock method of displaying time of NMO correction; By hardware aspect; Comprised the MCU microprocessor; Be used to the Low-Power CMOS band RTC real-time clock treatment circuit that clock processing information is provided and is controlled by said MCU microprocessor; Be used for the real-time detection variation of ambient temperature and give the temperature sensing circuit of said MCU microprocessor input monitoring information, be used to show the LCD LCDs circuit of said clock information.Microprocessor is at first provided on the sensor (adopting thermistor RT1 in the present embodiment) that can real-time detect variation of ambient temperature by the outside and obtains its magnitude of voltage with variation of ambient temperature; (be divided into is 23 grades from-30 ℃ to+80 ℃ when environment temperature; 5 ℃ every grade warm rank variations) under the different condition; Thermistor RT1 under the different temperatures environment, resistive impedance by 898.5K Ω to 5.5K Ω change (standard value be
+25 47K Ω when spending); When constant voltage (with 3.3V voltage as standard) through resistance and thermistor RT1 dividing potential drop, after the capacitor filtering shaping, the magnitude of voltage 3.22V to 0.66V that obtains changing; Be input to PIN97 (the I/O port of said MCU microprocessor; Be set to input end), microprocessor is according to fixed sample period (with the magnitude of voltage of 60 seconds 1 periodic sampling RTC crystal oscillators thermistor on every side), by the mean value calculation RTC crystal oscillator environment temperature of the magnitude of voltage that obtains in the sampling period; Look into the corresponding temperature of temperature characteristics of crystal oscillator; According to the temperature characterisitic deviate (deviate of the oscillation frequency when promptly oscillation frequency and+25 is spent under this temperature) of crystal oscillator, and calculate the time deviation value that this oscillation frequency is brought in 60 seconds, continuous above-mentioned time deviation value.After its value reached 1S, said MCU microprocessor to CMOS band RTC real-time clock treatment circuit, sent interpolation clock information (be equivalent to obtain present clock, regulate clock and return) through resistance; Simultaneously, microprocessor internal, the error amount that adds up is deducted the 1S of interpolation after, repeat again next cycle sampling, accumulative total computing, the work that so goes round and begins again.RTC real-time clock treatment circuit; Will be on the original clock basis, the 1 second clock information that is sent by microprocessor in the interpolation is connected with PIN22, the PIN23 of said microprocessor through resistance; The clock information that upgrades, be transferred to microprocessor and carry out the clock data renewal; Microprocessor is the display message of the clock data that upgrades.The transmission of the communication data line of the PIN71～PIN81 through said MCU microprocessor, to the PIN18～PIN30 of LCD display circuit, the driving circuit of control LCD display upgrades accurately clock information and shows.Briefly, be through temperature sensor, current which type of environment that is in of real-time detection auto clock display screen system; Be 1 sampling period through microprocessor with 60 seconds again; Detection according to the temperature characterisitic PPM value of crystal oscillator, constantly adds up computing from the change in voltage of temperature sensing circuit.After error amount reaches 1S, send 1 second clock information of interpolation and give the clock processing circuit, adjust clock (being equivalent to manual calibration clock) accurately.Compensation is because the slack-off amount of timing every day of ambient temperature effect clock crystal oscillator, guarantees that clock accuracy was less than 1 second/day purpose.
The above embodiment has only expressed several kinds of embodiments of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to claim of the present invention.Should be pointed out that for the person of ordinary skill of the art under the prerequisite that does not break away from the present invention's design, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with accompanying claims.
Claims (10)
1. the method from the automobile mounted clock of NMO correction is characterized in that, comprises the steps:
A) ambient temperature value that obtains current vehicle-mounted clock place in the unit interval is also according to said ambient temperature value, and the crystal oscillation frequency of searching and obtaining in its corresponding unit interval changes the time deviation value that brings;
B) with said time deviation value with specify value in the register to add up and be stored in this register;
Whether the numerical value of C) judging said appointment register-stored reaches first time value set, in this way, carries out next step, otherwise returns steps A);
D) obtain the present clock time, and after said first time value set of interpolation on this time, this value is returned clock;
E) value in the said appointment register deducts said first time value set, stores in the said appointment register; Return steps A).
2. the method from the automobile mounted clock of NMO correction according to claim 1 is characterized in that, said steps A) in further comprise:
A1) in the unit interval, obtain the magnitude of voltage of representing environment temperature according to the SF of setting;
A2) the said magnitude of voltage of obtaining of foundation is tabled look-up and is obtained the ambient temperature value of its representative;
A3) the said ambient temperature value that obtains of foundation is tabled look-up and is obtained the time deviation value in this following unit interval of temperature.
3. the method from the automobile mounted clock of NMO correction according to claim 2 is characterized in that, said steps A 3) in further comprise:
A31) table look-up according to the said ambient temperature value that obtains and obtain under this temperature the deviation value of crystal oscillation frequency under the crystal oscillation frequency and standard temperature;
A32) said frequencies deviation value and unit interval multiply each other and obtain the time deviation value in the said following unit interval of temperature.
4. the method from the automobile mounted clock of NMO correction according to claim 3 is characterized in that, said first time value set is 1 second, said step C) in judge in the said appointment register that whether time value totally is greater than 1 second.
5. the method from the automobile mounted clock of NMO correction according to claim 4 is characterized in that, said step D) in, further comprise the steps:
D1) obtain the current time value of clock;
D2) on the current time value, directly increase by first time value set;
D3) time value after will regulating is returned clock as the current time value and is shown.
6. the method from the automobile mounted clock of NMO correction according to claim 5 is characterized in that, said step e) in, further comprise the steps:
E1) obtain the absolute value of numerical value in the said appointment register;
E2) in the said absolute value of obtaining, deduct first time value set and the surplus value that obtains returned said appointment register as absolute value.
7. a realization is characterized in that according to claim 1 from the device of the automobile mounted clock method of NMO correction, comprising:
The time deviation value is obtained the unit: be used to obtain the ambient temperature value at current vehicle-mounted clock place in the unit interval and according to said ambient temperature value, search and obtain the time deviation value that the crystal oscillation frequency variation in its corresponding unit interval brings;
Time deviation value accumulative total unit: be used for said time deviation value with specify value in the register to add up and be stored in this register;
Time deviation value judging unit: be used to judge whether the numerical value of said appointment register-stored reaches first time value set;
Present clock is obtained and regulon: be used to obtain the present clock time, and after said first time value set of interpolation on this time, this value returned clock;
The time deviation value is removed the unit: the value that is used for said appointment register deducts said first time value set, stores in the said appointment register.
8. device according to claim 7 is characterized in that, said time deviation value is obtained the unit and further comprised:
Magnitude of voltage is obtained module: be used in the unit interval, obtaining the magnitude of voltage of representing environment temperature according to the SF of setting;
Ambient temperature value obtains module: be used for tabling look-up and obtaining the ambient temperature value of its representative according to the said magnitude of voltage of obtaining;
The time deviation value is obtained module: be used for tabling look-up and obtaining the time deviation value in this following unit interval of temperature according to the said ambient temperature value that obtains.
9. device according to claim 8 is characterized in that, said time deviation value is obtained module and further comprised:
The oscillation frequency deviation value is obtained submodule: being used for tabling look-up according to the said ambient temperature value that obtains obtains under this temperature the deviation value of crystal oscillation frequency under the crystal oscillation frequency and standard temperature;
The time deviation value is obtained submodule: being used for multiplying each other according to said frequencies deviation value and unit interval obtains the time deviation value in the following unit interval of said temperature.
10. device according to claim 9 is characterized in that, said present clock is obtained and regulon further comprises:
Current time is obtained module: the current time value that is used to obtain clock;
Current time adjustment module: on the current time value, directly increase by first time value set;
Current time is returned module: be used for the time value after regulating is returned clock and demonstration as the current time value.
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| CN110456628A (en) * | 2019-09-12 | 2019-11-15 | 珠海格力电器股份有限公司 | Method and device for automatically calibrating time of display screen, display screen and electric equipment |
| TWI697877B (en) * | 2019-03-15 | 2020-07-01 | 瑞鼎科技股份有限公司 | Calibration method for display clock and apparatus thereof |
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