CN102039841A - Method for adjusting display device - Google Patents

Method for adjusting display device Download PDF

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Publication number
CN102039841A
CN102039841A CN2010105441712A CN201010544171A CN102039841A CN 102039841 A CN102039841 A CN 102039841A CN 2010105441712 A CN2010105441712 A CN 2010105441712A CN 201010544171 A CN201010544171 A CN 201010544171A CN 102039841 A CN102039841 A CN 102039841A
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CN
China
Prior art keywords
actuating unit
voltage source
relative
unit
turnon time
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.)
Pending
Application number
CN2010105441712A
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Chinese (zh)
Inventor
A·克雷斯帕赫
S·温克
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.)
Robert Bosch GmbH
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Robert Bosch GmbH
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Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of CN102039841A publication Critical patent/CN102039841A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
    • B60Q3/00—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors
    • B60Q3/10—Arrangement of lighting devices for vehicle interiors; Lighting devices specially adapted for vehicle interiors for dashboards
    • B60Q3/16—Circuits; Control arrangements
    • B60Q3/18—Circuits; Control arrangements for varying the light intensity
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
    • H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
    • H05B45/56—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits involving measures to prevent abnormal temperature of the LEDs
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
    • Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]

Abstract

The present invention relates to a method for adjusting a display device. The invention provides a method for protecting the display device with a plurality of actuating mechanisms, namely a combined instrument in a motor vehicle, wherein, in a first step of the method, a plurality of measurement parameters are read, and relatively switching-on time (darkening) used for the actuating mechanisms is calculated according to the measurement parameters. Furthermore in the step, the actuating mechanisms are supplied through a voltage source and are triggered with the calculated relative switching-on time, wherein, a loading state of the voltage source is determined and compared with a preset threshold parameter. Furthermore, when the loading state exceeds the threshold parameter, the relative switching-on time of one actuating mechanism selected from the actuating mechanisms which are configured to the voltage source is changed.

Description

Be used to regulate the method for read out instrument
Technical field
The present invention relates to a kind of method that is used to regulate the read out instrument with a plurality of actuating units, this device is used in particular in the self-propelled vehicle as combination instrument.This combination instrument comprises several actuating units, and described actuating unit is particularly useful for illustrating the different parameters of self-propelled vehicle.By voltage source is that actuating unit is supplied with.By reading a plurality of measurement parameters, calculate relative turnon time (deepening), described actuating unit is with described relative turnon time operation.In addition, the present invention relates to a kind of control setup, this control setup is particularly suitable for carrying out the method.
Background technology
The voltage of combination instrument is supplied with design like this, thereby it can guarantee the operation of described device in each case.In this respect, especially meaningfully illustrate, for example conclusively show fault by warning light to the operation important parameters.At this, make have the number of the combination of examine to increase with each additional actuating unit that is installed in the combination instrument, these combinations must be covered reliably by voltage source.
But identifiability not only is subjected to the influence of the cover plate of possible combination lighting device, and is subjected to external action, just is subjected to the influence of environmental parameters.For example, the light situation around read out instrument has decisive meaning for the identifiability of the running state that illustrates.The voltage of device is supplied with so design, even make under strong solar light irradiation, also can read actuating unit.The Functional Capability of voltage source additionally depends on ambient temperature, and the maximum thus power that provides also is the variable that will pay close attention to for illumination Design.
Owing to use light-emitting diode as light source more and more, also must consider its temperature susceptibility.Low running temperature has improved the light radiation of LED, and light radiation reduces when heating gradually.
For the light radiation of LED being kept constant when the temperature traverse, for example DE 102004987A1 has described a kind of control that is used as the LED of light source in self-propelled vehicle, wherein measures external temperature and according to the electric current of the temperature control input LED that measures.The intensity of variation of the electric current of input LED is determined with respect to the temperature-light intensity-characteristic curve of the storage of LED by computing machine.
Disclose a kind of LED matrix by DE 10102352A1, wherein adjusted by the default current-voltage characteristic curve of the control monitor unit of LED matrix.For this reason, the analytical equipment in parallel with LED matrix detects the running voltage of LED matrix and according to this running voltage master cock element.The load current and the LED current summation that are produced by the trigger switch element become current value, this current value in current-voltage-characteristic curve corresponding to running voltage.
To consider the different brilliance grade of mounted LEDs equally.DE 10146094A1 has described a kind of trigger element that is used for illumination equipment for this reason, is identified for the trigger value of the brilliance grade that depends on mounted LEDs of voltage supply in this trigger element.Described trigger value has been set the pulse width of the service voltage of regulating by pulse width modulation.
Except the exemplary factor of mentioning, the influence of the optimal illumination of device factor that also be subjected to other certainly, that herein can not totally list.At this, can realize so that fully promptly in the effect that will pay close attention to some are compensated, the LED that for example will have poor brilliance grade is applied to have in the modification of adaptation various places of combination instrument of a small amount of warning light.But, must be noted that the worst case scene of all possible factor for the design of read out instrument.Along with the increase of number of parameters and the increase of parameter branch, worst case solution and best solution depart from more and more far away.
The objective of the invention is to, propose a kind of method that is used to protect read out instrument, wherein improve the utilization of employed element, and prevent the voltage source overload reliably.
Summary of the invention
Propose in order to solve this purpose, determine voltage source loading condition and with default absolute rating relatively.If the parameter of overstepping the extreme limit is then regulated the relative turnon time attach troops to a unit in one of actuating unit of voltage source.The direction of regulating depends on the function of actuating unit and the type of adjustable parameter at this.
Actuating unit can be such load, and its deepening impels the absolute rating that is lower than selected adjustable parameter.For example, the deepening of LED reduces to supply with the load that will bear by actuating unit by means of pulse width modulation.Under overload situations, what one or more was such attaches troops to a unit in the further deepening of the actuating unit of voltage source, may be up to cutting off fully.Under limiting case, deepening is carried out towards zero, can realize total cut-out of read out instrument equally.
On the contrary, if actuating unit is such load, its deepening impels the absolute rating that further surpasses selected adjustable parameter, and actuating unit is just oppositely regulated so.For example, when surpassing the temperature that is provided with as absolute rating, improve the rotating speed that is installed in the ventilator in the read out instrument.Preferably, in this case, two absolute ratings are set.When surpassing first absolute rating, improve the load on the relevant actuating unit, and when surpassing second absolute rating, make its deepening impel the actuating unit deepening of the absolute rating that is lower than selected adjustable parameter.For ventilator, second absolute rating for example is its maximum speed.After reaching this rotating speed, rise for example one or more LED deepenings of other actuating unit of read out instrument for preventing further temperature.
Pass through the adjusting that proposed, all combinations of safety employed element of interception and voltage source, and prevent possible overload thus.Adjusting of the present invention has realized the enough optimization of employed circuit elements design thus.The direction of worst case scene is no longer necessary.This method allows particularly to suffer in self-propelled vehicle in the combination instrument of a lot of external actions read out instrument to be optimized thus.
In addition, realized being the more favourable element of read out instrument alternative costs equally by method of the present invention.Loading on here of strengthening when being used for the absolute rating of design element and reaching capacity parameter by element determined by the designer.Therefore, in the design of read out instrument, no longer require size according to worst case scene design element.Thus, allow to select inexpensive assembly by method of the present invention.In addition, this makes that also design obtains the failure-free guarantee, because can not occur overload again.
Except the protection voltage source, preferably also can be used to ensure the safety of each actuating unit by method of the present invention.If the step-less adjustment of actuating unit allows, when being reached for the default limit of actuating unit, reduce its relative turnon time so.If actuating unit can not deepening, its relative turnon time can be set to zero so, just impels actuating unit to cut off.Actuating unit on the application's meaning is interpreted as any lossy element of read out instrument.
The load of each voltage source is meant its current draw especially.Like this, at the current draw of the corresponding permission that surpasses read out instrument or also can when surpassing the total current drain that allows, regulate.Other possible loading condition is consumption of power and/or voltage and/or temperature.Adjustable parameter can be respectively actuating unit and/or voltage source or read out instrument and determine.
Preferably, analyze more than one adjustable parameter, thus at the protection of all contingent situations realizations to read out instrument.Also prevented the fire that the overload by element or voltage source causes by this way reliably by the use of method of the present invention.
In principle, regulate absolute rating and the existing condition effect of passing through more corresponding adjustable parameter.For example, this realizes divided by actual value by absolute rating.For the normalisation of setting range, the merchant's who obtains value is preferably limited in the scope between 0 and 1.Like this, regulon abandons all and surpasses 1 value.Adjusting is along with the parameter that reaches capacity begins.
Absolute rating can form by limit, and this limit begins to enter the overload of corresponding element, voltage source or read out instrument certainly.In the case, regulate along with the value of reaching capacity effect.
Scheme as an alternative, absolute rating also can be arranged on the anterior area of limit, to above-mentioned example, just in merchant's value greater than 1 o'clock.In the case, because along with the parameter that reaches capacity begins to regulate, so prevent to surpass described limit.In preferred embodiment, in the scope that is between absolute rating and the limit, regulate with form buffering, that preferably rise and carry out towards limit.Regulate avoid that actuating unit triggers strong and to the astonishing variation of the user of read out instrument by soft the beginning.
By means of by method of the present invention, also can implement fault recognition.Be adjusted to each actuating unit and calculate relative turnon time, by be applied to current value and the magnitude of voltage on the actuating unit in this process, it obtains the loss power that produces on actuating unit.All are attached troops to a unit in the data addition of the actuating unit of voltage source and determine the electric current and the power of voltage source thus.If can determine inconsistent with measured value at this, this just means in read out instrument in-to-in fault so.
In a kind of simple embodiment, the adjustable parameter that will determine by means of sensor measurement.In the case, allow sensor is carried out the confidence level test by method of the present invention.Output valve with sensor compares with the value that exists after regulating for this reason.Temperature sensor in the read out instrument for example shows the temperature of the parameter that oversteps the extreme limit.Although if the intervention of regulating, temperature does not also descend, this is the obvious sign of defective so.
Particularly advantageous is the alerting ability of regulating.It allows a large amount of possible adjusting interventions, and it may be differently malfunctioning according to the height that surpasses set absolute rating.Parameter is very little if overstep the extreme limit, and it is just enough so only to regulate an actuating unit.For example, if surpass the temperature that is set to the limit slightly, so, only the rotating speed of LED of deepening strongly or raising ventilator is just enough.If difference is bigger, adjusting may relate to a plurality of actuating units so, can be a plurality of LED of further deepening and ventilators that will improve rotating speed wanted to this.
The preferred loading condition that calculates actuating unit or voltage source at least in part is for example by using corresponding characteristic curve.In the case, the input value of characteristic curve is the eigenwert of actuating unit or voltage source, and output valve is the sizeable absolute rating of the difference of actuating unit.Eigenwert is current draw, voltage or the temperature measured and/or that calculated of actuating unit.Measure by abandoning at least in part, avoid in combination instrument, being used for otherwise the extra cost of necessary measurement mechanism.Can bring necessary for this reason horsepower rating by regulon, thereby not need extra computing machine.
In a kind of particularly preferred embodiment, the loading condition by voltage source calculates its current temperature and uses as adjustable parameter.In the case, with direct mode detect voltage source face overheated, it has realized regulating immediately intervention.
In preferred embodiment, determine the LED brilliance grade of institute's mounted LEDs.Measure the different series resistances of mounted LEDs on the A/D passage for this reason.Scheme encodes in EEPROM the modification of the adaptation various places of combination instrument as an alternative, and it allows the anti-institute's mounted LEDs of releasing.Institute's mounted LEDs brilliance grade directly can be stored among the EEPROM equally.
In addition, proposed a kind of control setup, it is particularly suitable for carrying out described method.Be used to carry out above-mentioned adjusting for having set calculating unit by the control unit that is used for read out instrument of the present invention.
Description of drawings
Below, explain the present invention in more detail according to schematic figures.Wherein:
Accompanying drawing 1 is according to the embodiment of the control of the combination instrument of known systems;
The embodiment that has replenished adjusting of the present invention of accompanying drawing 2 accompanying drawings 1.
The specific embodiment
Accompanying drawing 1 illustrates the schematic circuit diagram according to the control of the combination instrument of known systems.Described combination instrument has the actuating unit of some n, has three actuating unit 1-3 in the present embodiment.Described actuating unit 1-3 for example LED or ventilator is supplied with by voltage source 4.The sensor of some m is the input parameter that three sensor 5-7 measure control here.For example, sensor 5 measure ambient light, sensor 6 is measured temperature, and sensor 7 is measured the setting of adjusting knurl of the manual deepening of the illumination that is used for combination instrument.
Under the situation of the input feature vector curve 8-10 that pays close attention to each sensor 5-7, handle measured input parameter by control unit 11.As a result of, be identified for the deepening request 12 between 0% and 100% of being in of combination instrument.Deepening request 12 passage period filters 13 and under the situation of the corresponding output characteristic curve 14-16 that pays close attention to described actuating unit by being used for the pulse width modulation (PWM) of described actuating unit 1-3 1To PWM 3Realize.Characteristic curve shown in each also can replace by algorithm.
Accompanying drawing 2 show accompanying drawing 1 expansion by the schematic circuit diagram of adjusting of the present invention.Adjustable parameter is the current draw by the actuating unit 1-3 of voltage source 4 supplies in this example.In this example, the current current draw of actuating unit 1-3 by with pulse width modulation (PWM) separately 1To PWM 3The calculating of multiplying each other of switch time length.The summation 17 of the current draw of the actuating unit that all link to each other with voltage source 5 has obtained total current drain I IstScheme for example when the accurate number of actuating unit is unknown, replaces the known number n of actuating unit as an alternative, can be from the equipment e of maximum possible.In the case, promptly be labeled as 18 I here as single numerical value 1* PWM 1To the I that is labeled as 19 here e* PWM eSummation calculate I IstI 1To I eThe current draw of actuating unit when this is illustrated in 100% triggering.
In the example of simplifying, set the absolute rating 20-22 of common adjustable parameter respectively for actuating unit 1-3.Adjustable parameter does not allow to surpass the maximum current consumption of determining for each single actuating unit 1-3, and it is used to avoid actuating unit to supply with 4 overload.At this, select the corresponding value V of actuating unit 1-3 as eigenwert 23-25 InThe input value that eigenwert 23-25 can be used as corresponding characteristic curve 26-28 receives.The absolute rating 20-22 that its output valve is fit to for the difference size.Thus, determine the current draw of the maximum of actuating unit, and addition obtains maximum total current drain I in step 29 by characteristic curve 26-28 MaxScheme also can be used as the absolute rating of default each actuating unit of fixed value or the value of maximum load state as an alternative.In step 30, compare I MaxAnd I IstBe the standardized value scope, in step 31, will abandon greater than 1 quotient.In step 32, result and original deepening request 12 couplings, and closed regulating loop.

Claims (10)

1. be used to protect read out instrument with a plurality of actuating units; the method of the combination instrument in self-propelled vehicle particularly; wherein; in first method step; read a plurality of measurement parameters; according to the relative turnon time (deepening) of the described actuating unit of described measurement Parameters Calculation; and wherein; described actuating unit is supplied with by voltage source and is triggered with the relative turnon time of calculating; it is characterized in that; determine voltage source loading condition and with default absolute rating relatively; and when overstepping the extreme limit parameter, change was attached troops to a unit in the relative turnon time of one of actuating unit of voltage source.
2. the method for claim 1 is characterized in that, be to determine the loading condition of voltage source, measures or calculate at least in part at least one characteristic parameter of attaching troops to a unit in the actuating unit of described voltage source.
3. as the described method in one of claim 1 or 2, it is characterized in that, determine the total current drain of described actuating unit and/or affiliated voltage source and/or consumption of power and/or temperature and with default absolute rating relatively, and when surpassing described absolute rating, change the relative turnon time of at least one actuating unit.
4. as the described method of one of above-mentioned claim, it is characterized in that the loading condition of the voltage source of actuating unit being supplied with by the eigenvalue calculation of at least one actuating unit.
5. as one of above-mentioned claim described method; it is characterized in that; the limit that the voltage that described default absolute rating is actuating unit described actuating unit or described or other element that will protect is supplied with for the reliability service of described read out instrument, does not allow to surpass this limit.
6. as one of above-mentioned claim described method, it is characterized in that the absolute rating of described actuating unit and/or described voltage source overlaps with the limit of presetting, and begins to enter the overload of corresponding actuating unit and/or voltage source from described limit.
7. as one of above-mentioned claim 1 to 5 described method, it is characterized in that, described absolute rating is set, thereby before reaching default limit, begins to change relative turnon time, begin to enter the overload of respective execution mechanisms and/or voltage source from described limit.
8. as one of above-mentioned claim described method, it is characterized in that the intensity of the change of described relative turnon time and/or the number of the relative turnon time of change join with the height correlation of the parameter that oversteps the extreme limit.
9. as one of above-mentioned claim described method, it is characterized in that, when surpassing described absolute rating, improve and attach troops to a unit in relative turnon time of one of actuating unit of voltage source and when reaching maximum turnon time of actuating unit, reduce the relative turnon time of other actuating unit.
10. the control setup that is used for display unit, especially for implementing by the described method of one of aforesaid right requirement, described control setup comprises and is used to illustrate the interface of the actuating unit of running state, wherein, described actuating unit is supplied with by voltage source, described control setup also comprises control unit, be used to calculate the relative turnon time of described actuating unit, described control setup also comprises the interface with sensor, described sensor provides important measurement parameter for the relative turnon time of determining described actuating unit, it is characterized in that, described control setup has the interface with calculating unit, wherein, described calculating unit is used for determining the loading condition of described voltage source and/or the total current drain of described read out instrument.
CN2010105441712A 2009-10-14 2010-10-13 Method for adjusting display device Pending CN102039841A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009045650.3 2009-10-14
DE102009045650.3A DE102009045650B4 (en) 2009-10-14 2009-10-14 Method for controlling a display device

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DE102012016290B4 (en) * 2012-08-16 2023-11-23 Volkswagen Aktiengesellschaft Method, operating device and system for adjusting the brightness of a display for a vehicle
DE102017131074A1 (en) * 2017-12-22 2019-06-27 HELLA GmbH & Co. KGaA Lighting device for vehicles and control methods

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Application publication date: 20110504