CN109946510A - The method and battery sensor of load current for identification - Google Patents
The method and battery sensor of load current for identification Download PDFInfo
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- CN109946510A CN109946510A CN201811529077.2A CN201811529077A CN109946510A CN 109946510 A CN109946510 A CN 109946510A CN 201811529077 A CN201811529077 A CN 201811529077A CN 109946510 A CN109946510 A CN 109946510A
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- voltage drop
- temperature
- correction factor
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- 238000000034 method Methods 0.000 title claims description 33
- 238000012937 correction Methods 0.000 claims abstract description 102
- 238000001514 detection method Methods 0.000 claims abstract description 25
- 238000005259 measurement Methods 0.000 claims description 8
- 230000005611 electricity Effects 0.000 description 14
- 230000032683 aging Effects 0.000 description 4
- 230000003862 health status Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011144 upstream manufacturing Methods 0.000 description 2
- 238000011000 absolute method Methods 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010187 selection method Methods 0.000 description 1
- 238000011282 treatment Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/374—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] with means for correcting the measurement for temperature or ageing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
- G01R15/146—Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/32—Compensating for temperature change
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/20—Modifications of basic electric elements for use in electric measuring instruments; Structural combinations of such elements with such instruments
- G01R1/203—Resistors used for electric measuring, e.g. decade resistors standards, resistors for comparators, series resistors, shunts
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/14—Measuring resistance by measuring current or voltage obtained from a reference source
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/364—Battery terminal connectors with integrated measuring arrangements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Secondary Cells (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
Determine the battery sensor of battery load current, it has an at least measuring resistor, and be designed to detect at least measuring resistor both end voltage drop and identify load current according to voltage drop, battery sensor has at least two detection devices of a detection at least battery parameter and identifies the assessment device of an at least correction factor according to an at least battery parameter.Load current is identified by following steps: a) detecting at least two battery parameters and its time graph using at least two detection devices, b) an at least time graph of one of at least parameter in battery parameter and/or battery parameter is determined according to the time graph of detected battery parameter and/or detected battery parameter, to determine correction factor, c) an at least correction factor is identified using at least time graph of battery parameter selected by one and/or at least battery parameter selected by one, d) according to the voltage drop at least detected at measuring resistor both ends and at least, a correction factor determines load current.
Description
Technical field
The present invention relates to a kind of methods for identifying the load current of battery using battery sensor, wherein the electricity
Pond sensor has at least one measuring resistor, and is designed to detect the voltage at least one measuring resistor both ends
It drops and load current is identified according to the voltage drop.In addition, the present invention relates to this battery sensors.
Background technique
Battery sensor for detecting the battery current of Vehicular battery in the car, so as to make the electricity about battery
The explanation of amount state or health status.Battery sensor be typically arranged at battery electrode and have for example for vehicle electrical
The battery terminal of pond contact.In addition, battery sensor usually has the measurement resistance in the current path for being arranged in load current
Device and voltage check device, the voltage check device can detecte the electric current (for example, load current) for flowing through measuring resistor
Voltage drop.When the resistance of known measuring resistor, Ohm's law being detected according to measuring resistor both ends can be used
To voltage drop identify the electric current for flowing through measuring resistor, that is, load current.
However, the resistance of measuring resistor depends on many factors, and can also be sensed during operation or in battery
Variation in the service life of device.For example, resistance can be influenced environment or since aging effect is in a manner of depending on temperature
And change.
In addition, the analog-digital converter or signal amplifier for signal processing may have the error of absolute method of measurement, that is, so-called
Offset, this may cause the additional inaccuracy of measurement result.
Become known for the various methods of calibration battery sensor from the prior art.For example, identification is detected for adjusting
At least one correction factor of the voltage drop and/or resistance arrived, therefore to improve the accuracy of current measurement.It is well known, however, that
Method respectively have the disadvantage or all modes of operation that cannot occur during vehicle operation in all use.
For example, can detecte the temperature of battery or the temperature of battery sensor, preferably measuring resistor.Identify in advance
Correlation and, for example, temperature/correction factor characteristic curve between temperature and correction factor.It is and described when known to temperature
The corresponding correction factor of temperature or corresponding resistance can obtain according to characteristic curve and for accurately calculating resistance simultaneously
And therefore calculating current.However, the change relevant to temperature of resistance is only accounted for this identification of correction factor by temperature
Change.Other variations for not considering resistance or the other influences to resistance, such as ageing-related changes or since environment influences
Caused variation.In addition, the method depends on the accuracy of temperature measurement.
As an alternative, it is known that will be known or measure the limit of very levels of precision during the operation of battery sensor
Determine reference current and be applied at least one measuring resistor, and identifies caused additional in measuring resistor by reference current
Voltage drop.The precise resistances of measuring resistor can be identified according to the voltage drop and known reference electric current or for adjusting electricity
The correction factor of resistance.However, the method is not for example when being related to the quick variation and thus caused resistance variations of temperature
Applicable.
Summary of the invention
The object of the present invention is to provide reliably determine battery current under all modes of operation that can occur in the car
Method and battery sensor.
In order to realize the purpose, it provides a kind of for identifying the side of the battery current of battery using battery sensor
Method, wherein battery sensor has at least one measuring resistor, and is designed to detect at least one measuring resistor
The voltage drop at both ends simultaneously identifies battery current according to voltage drop.The battery sensor have for detect in each case to
At least two detection devices of a few battery parameter.This method has follow steps:
A) at least two battery parameter and these are detected using at least two detection device (26,26a, 26b, 34)
The time graph of battery parameter,
B) these batteries are determined according to institute's detection time curve of detected battery parameter and/or detected battery parameter
At least one time graph of at least one parameter and/or one of these battery parameters in parameter, to determine correction factor,
C) using this battery parameter selected by least one and/or this at least one selected by the time graph of battery parameter know
At least one other correction factor,
D) according at least the voltage drop of measuring resistor (24,24a, 24b) both ends detection and this at least one correction because
Son determines battery current (18).
Therefore the value and time graph of at least two battery parameters are considered, so as to bent for the time in each case
Line options can be used at least one correction factor that at least one parameter in the battery parameter determines and for using
The method that one of described battery parameter determines correction factor, the correction factor and method allow to determine electricity as accurately as possible
Pond electric current determines at least one correction factor as accurately as possible.For example, considering the value and/or battery of battery parameter here
The change rate of parameter.In this case, change rate can be the variation for example depending on the battery parameter of time, or take
Certainly in the pace of change of the battery parameter of time.
Correction factor can be subsequently used for the resistance or the more accurate value of resistance for identification of correction measuring resistor.So
And correction factor can also be after the voltage drop at detection measuring resistor both ends for adjusting the voltage identified according to voltage drop
Signal.
Therefore, on the one hand, selection method and battery parameter can be distinguished, it in this way, can be in battery parameter
Correction factor or battery current are identified in a manner of most accurate in institute's recognition time curve.On the other hand, battery sensor can be with
With simpler design.Due to determining at least one correction factor according only to a battery parameter in each case,
All signals detected using detection device need not be handled simultaneously.For example, the Combined Treatments such as analog-digital converter or amplifier
Device can be accordingly used in detection device.According to institute's choosing method and selected battery parameter, the processing unit property of can choose it is used for
Handle corresponding battery parameter or for identification battery current.
This method can be used for determining any method of correction factor and execute.Only needing can be in different operation
Correction factor is determined using this method (that is, utilizing the different value and curve of battery parameter) under state.
For example, at least one battery parameter may include the temperature of battery and/or the temperature of battery sensor, wherein can
To identify correction factor according to temperature, to compensate the variation relevant to temperature of resistance.Battery parameter is preferably this extremely
The temperature of a few measuring resistor.
Identified using at least one temperature at least one correction factor include for example according to be previously identified, temperature with extremely
Correlation between a few correction factor, selects correction factor in particular according to temperature/correction factor characteristic curve.Therefore,
Such as resistance for certain temperature or temperature curve is predefined on testboard, and for example by it with characteristic shape
Formula stores.As an alternative, at least one correction factor for depending on temperature is identified and stored.If identifying temperature,
The then accessible pre-stored data, and corresponding correction factor can be used to identify the electricity of measuring resistor
Resistance.This allow to simply and quickly identify the correction of the resistance or the resistance for measuring resistor of measuring resistor because
Son.
At least one battery parameter can be the voltage drop at least one measuring resistor both ends.In this case, it examines
It surveys device and preferably includes voltage check device.Detection device is for example formed by voltage check device, so that not needing individually
Detection device.
Identified by the voltage drop at least one measuring resistor both ends at least one correction factor preferably include with
Lower step:
The reference current of restriction is applied at least one measuring resistor,
Identify voltage drop of the reference current at least one measuring resistor,
Correction factor is identified according to voltage drop of the reference current at least one measuring resistor.
With continually changing load current during vehicle operation on the contrary, reference current is known.For example, reference current
It is provided by point-device reference current source and/or point-device degree is identified to by reference to current measuring device.It can
The resistance of measuring resistor is identified according to the voltage drop due to caused by reference current in measuring resistor by Ohm's law
Or the correction factor of the resistance for measuring resistor.It, can be with using the identified resistance or the correction factor identified
Load current is determined using the voltage drop of load current.
Preferably, load current is applied at least one measuring resistor, and identifies load current and reference electricity
Flow the voltage drop at least one measuring resistor.Therefore, correction factor can be determined during the operation of battery sensor.
For determining at least one correction factor by measurement voltage drop due to caused by reference current, it is only necessary to can be with
It is distinguished between voltage drop and the voltage drop due to caused by load current due to caused by reference current, so as to according to
The voltage drop of reference current determines at least one correction factor.
The quick variation of temperature may cause the resistance variations of measuring resistor, and voltage drop detected is therefore caused to become
Change, this has an impact to detection voltage drop due to caused by reference current.Cause in the measuring resistor due to caused by load current
Voltage drop variation fast-changing load current may similarly make it difficult in the voltage drop due to caused by reference current
It is distinguished between the voltage drop due to caused by load current.In addition, higher compared with reference current and lead to larger electricity
The load current of pressure drop may make it difficult to determine voltage drop relatively low due to caused by reference current.
Therefore, when there is following situations, at least one voltage is preferably chosen as determining the electricity of correction factor
Pond parameter:
Threshold value according to the change rate of the time graph of at least one temperature identification lower than restriction,
According to the change rate of the time graph of at least one voltage identification lower than the threshold value limited, and
Load current is lower than the threshold value limited.
When selecting the above method for determining at least one correction factor, the temperature of battery can also be preferably identified
The temperature of degree and/or battery sensor, preferably at least one measuring resistor, and use identified temperature and Dang Wen
Being somebody's turn to do used as the voltage identification of battery parameter when the change rate of degree is lower than limiting value (that is, very low) and/or constant temperature
At least one correction factor adjusts the correlation between be previously identified, temperature and correction factor, especially adjusting temperature/correction
Property curve.
If temperature is constant or only very slowly changes, the uniform temperature distribution in measuring resistor assume that,
And it is therefore assumed that can highly precisely determine correction factor according to the voltage drop due to caused by reference current.It therefore, can be with
The resistance of measuring resistor is determined to point-device degree.Due to temperature it is also known that very accurate, these values can be with
For correcting or calibrating the correlation between temperature and correction factor, for example, so as to for measuring resistor resistance with it is old
Change related or variation with environmental correclation to adjust the correction factor depending on temperature.
When there is following situations, at least one temperature is preferably chosen as determining that the battery of correction factor is joined
Number:
Threshold value according to the change rate of the time graph of at least one temperature identification not less than restriction,
According to the change rate of the time graph of at least one voltage identification not less than the threshold value limited, and
Load current is not less than the threshold value limited.
That is, for example for the above reasons, when identifying at least one correction factor not by voltage or voltage drop
When being suitable as battery parameter, at least one temperature is used as battery parameter to determine at least one correction factor.
In addition, in order to realize the purpose, providing a kind of for determining the battery sensor of the load current of battery, the electricity
Pond sensor has at least one measuring resistor and is designed to detect the voltage at least one measuring resistor both ends
Drop, and battery current is identified according to voltage drop.The battery sensor has for detecting at least one in each case
At least two detection devices of battery parameter and for identifying at least one correction factor according at least one battery parameter
Assess device.Specifically, load current is identified using method as described above.
At least one detection device can have temperature sensor, the temperature sensor be used for detect battery temperature and/
Or the temperature of battery sensor, especially at least one measuring resistor.
In addition, at least one detection device may include the voltage drop for detecting at least one measuring resistor both ends
Voltage check device.
In the embodiment finally referred to, battery sensor preferably have for by the reference current of restriction be applied to
The reference current source of a few measuring resistor.
Detailed description of the invention
Other advantage and feature are generated according in conjunction with being described below for attached drawing, in the accompanying drawings:
Fig. 1 shows the first embodiment of battery sensor, and
Fig. 2 shows the second embodiments of battery sensor.
Specific embodiment
Fig. 1 shows the battery sensor 10 for measuring the battery current of battery in vehicle.Battery sensor 10 has the
A connection piece 12 and the second connector 14, and be arranged in the load current path 16 of vehicle, so that the load current of vehicle
18 flow through battery sensor 10.
Battery sensor 10 can detecte at least two battery parameters, be in an illustrated embodiment the temperature of measuring resistor
Degree, cell voltage and load current, to make the explanation of state of charge and health status about battery.
For this purpose, battery sensor 10 has voltage measuring apparatus 20, which is connected to the first connection
Part 12 is to detect cell voltage.Further it is provided that current measuring device 22 is to determine load current 18.Further it is provided that temperature is surveyed
Device 23 is measured to determine the temperature of battery or the temperature of battery sensor.
Current measuring device 22 has measuring resistor 24 and voltage check device 26, which is arranged in load
In current path and load current flows through the measuring resistor, and input terminal 28a, 28b of the voltage check device are connected
To correspondence contact point 30a, 30b of the upstream and downstream in measuring resistor 24.The detection of voltage check device 26 contact point 30a,
Voltage drop between 30b, that is, the voltage drop at 24 both ends of measuring resistor.Voltage check device 26 can have amplifier and/or
Analog-digital converter.
When known to the resistance of measuring resistor 24, the detected voltage drop at 24 both ends of measuring resistor can be used for basis
Ohm's law (I=U/R) determines load current 18.
However, the resistance of measuring resistor 24 may due to such as various factors such as temperature of measuring resistor 24, due to
Aging and/or due to environment influence and change.Therefore, it is necessary to before the operation of battery sensor 10 and during operation as far as possible
The resistance of measuring resistor 24, or identification are accurately determined for adjusting measured voltage drop and/or the correction of identified electric current
The factor.
For this purpose, battery sensor 10 is designed to detect battery parameter and thereby determines that at least one correction factor, it should
Correction factor can be used for correcting or adjusting the resistance of measuring resistor 24 and/or the output signal of voltage check device 26.
First battery parameter is the temperature of measuring resistor 24 or the temperature signal 32 that is detected using temperature-measuring module 34.
Temperature-measuring module 34 is connected to two temperature sensors 36a, 36b, the two temperature sensors are each measuring resistor 24
The temperature of measuring resistor 24 is detected at a position, and the temperature is output to temperature-measuring module 34.Temperature measures mould
Block 34 identifies temperature signal 32 according to each temperature of temperature sensor 36a, 36b, according to the temperature signal, in assessment unit
At least one of voltage drop of the identification for the resistance of measuring resistor 24 or for being detected using voltage check device 26 in 37
Correction factor.
Measuring resistor 24 or the resistance and measuring resistor of at least one correction factor have been identified and stored in advance
Ratio between 24 temperature.For example, identified in assessment unit 37 and to store temperature/correction factor characteristic bent
Line.When known or identified temperature, corresponding correction factor can be identified according to institute's storing data.
Instead of the two temperature sensors 36a, 36b shown here, an individual temperature sensor also can be used
Or multiple temperature sensors are used, the average temperature of measuring resistor 24 is identified according to the measured temperature of these temperature sensors
Degree or Temperature Distribution, corresponding temperature/correction factor characteristic curve about the mean temperature or Temperature Distribution be stored in and commented
Estimate in unit 37.
Second battery parameter is the voltage drop identified using voltage check device 26.In order to be determined according to voltage drop
The resistance or correction factor of measuring resistor 24, additionally provide reference current circuit 38.Reference current circuit 38 can be with accurate
Reference current 40 is applied to measuring resistor 24 by known current strength.Voltage check device 26 can be used determine due to
The voltage drop at 24 both ends of measuring resistor caused by reference current 40, and can be according to the voltage drop and reference current 40
Current known intensity determines the precise resistances of measuring resistor 24.
Reference current circuit 38 has to be connected by the first connector 12 of dropping resistor 44 and battery sensor
The first contact 42, be arranged in measuring resistor 24 upstream the second connector 46 and be arranged in measuring resistor 24
Downstream third connector 48.In addition, reference current circuit 38 have be arranged in the first contact 42 and third contact it
Between reference current resistor 50 and switch for being electrically connected between the first contact 42 and the second contact 46
52.Reference current resistor 50 is preferably the resistor of high precision, very accurate known to the resistance of the resistor, and should
The resistance of resistor is only subjected to very small variation due to aging, temperature, environment influence or other factors.
Further it is provided that second voltage detection device 54 is to detect the voltage drop at 50 both ends of reference current resistor.It will be surveyed
Amount voltage drop is transferred to circuit 56, is also transferred to the voltage drop at 24 both ends of measuring resistor detected by voltage check device 26
The circuit, and each voltage drop can be separated from each other by the circuit.Filter 57 is provided in the downstream of circuit 56 to reduce letter
Number noise.
In addition, circuit 56 can identify at least one school according to the voltage drop of the reference current at 24 both ends of measuring resistor
Positive divisor.
In order to determine the resistance of measuring resistor 24, during the routine operation of battery sensor 10, switch 52 is closed,
And reference current 40 is therefore applied to measuring resistor 24.Therefore, the detection of voltage check device 26 is drawn by reference current 40
The voltage drop in measuring resistor 24 risen.In this case, whether load current 18 is applied to 24 base of measuring resistor
It is inessential on this.The voltage drop of reference current 40 is detected using second voltage detection device 54 and is transferred to circuit
56, which also detects the voltage drop at 24 both ends of measuring resistor, and the voltage drop at the measuring resistor both ends is by due to reference electricity
The voltage drop of voltage drop caused by stream 40 and optionally load current 18 is constituted.
The voltage drop can be separated from each other by circuit 56, and can be according to the voltage due to caused by reference current 40
Drop is to identify the measured voltage drop for the resistance of measuring resistor or for load current on measuring resistor element 24
At least one correction factor.
The correction factor identified respectively is output to switch 58, which depends on the position of the switch and will identify according to temperature
At least one correction factor or according to voltage drop identify at least one correction factor be output to assessment device 60, in the assessment
In device, according to the correction factor of the voltage drop, output detected by voltage check device 26 and the resistance of measuring resistor 24 come
Identify the current strength of load current 18.
In order to select respectively more favorable battery parameter provided with identifying at least one correction factor with multiple ratios
Compared with the circuit of circuit 62a, 62b, 62c, 62d, 62e.
First comparison circuit 62a has the voltage drop detected by voltage check device 26 as input signal and first threshold
64a, the first threshold indicate the limiting value of the magnitude of voltage drop.
In the first comparison circuit 62a, the voltage drop for using voltage check device 26 to detect and first threshold 64a are carried out
Compare, and only exports a signal when voltage is lower than first threshold 64a.
Second comparison circuit 62b have the change rate of the voltage drop detected by voltage check device 26 as input signal with
Second threshold 64b, the change rate are identified by circuit 65b, and the second threshold indicates the limiting value of the change rate of voltage drop.
The time graph of voltage drop or change rate are compared with second threshold 64b, and work as the change rate of voltage drop
When lower than second threshold 64b (that is, occurring slower than the pace of change specified by second threshold 64b), a letter is only exported
Number.
Third comparison circuit 62a has the change rate of temperature as input signal and third threshold value 64c, and the change rate is by electricity
Road 65c is identified according to the temperature signal 32 for using temperature-measuring module 34 to identify, and the change of the third threshold value table temperature displaying function
The limiting value of rate.
Third comparison circuit 62c is checked to determine whether the change rate of temperature variation over time or temperature is lower than and make
The pace of change limited with third threshold value 64c, and a signal is only exported when pace of change is lower than third threshold value 64c.
The signal of the signal of first comparison circuit 62a and the second comparison circuit 62b is output to the 4th comparison circuit 62d,
When the first comparison circuit 62a signal and the second comparison circuit 62b signal both in the presence of, the 4th comparison circuit is only defeated
A signal out.
The signal of the signal of third comparison circuit 62c and the 4th comparison circuit 62d is output to the 5th comparison circuit 62e,
When the two signals all in the presence of, the 5th comparison circuit only exports a signal.
The signal of 5th comparison circuit 62e is output to switch 58 as switching signal.
If at switch 58 be not present switching signal, switch switch so that by identified according to temperature at least one
Correction factor is output to assessment device 60, that is to say, that identifies correction factor using the temperature of measuring resistor.
If there are switching signals at switch 58, switch switch so that will be when applying reference current 40 according to electricity
Pressure or at least one correction factor of voltage curve identification are output to assessment unit 60.
Therefore, when there is following situations, Jin Shiyong is identified when applying reference current 40 according to voltage or voltage curve
At least one correction factor identify load current:
Voltage drop is lower than first threshold, that is to say, that there is no excessively high voltage drops, and therefore also there is no excessively high
Load current,
The change rate of voltage drop is lower than second threshold, that is to say, that voltage drop only occurs slowly to become over time
Change, and
The change rate of temperature is lower than third threshold value, that is to say, that slowly occurs.
Excessively high load current or since the voltage drop excessively high caused by measuring resistor 24 of load current 18 will be led
Cause the voltage drop due to caused by reference current 40, the reference current is very low compared with load current, cannot highly precisely by
It determines.
In addition, the quick and biggish variation of load current 18 may make it difficult to be accurately determined due to reference current 40
Caused voltage drop.
The quick variation of the temperature of measuring resistor 24 may cause the resistance variations of measuring resistor, this may equally make
It must be difficult to be accurately determined the voltage drop due to caused by reference current.
Therefore, if there is one of these factors, then load current is identified by depending on the correction factor of temperature.
If meeting these three above-mentioned requirements, can be determined with enough accuracy due to reference current 40
Caused voltage drop, and at least one correction factor can be used to identify load current, at least one correction factor is
Through according to the detected voltage drop in measuring resistor 24 or since reference current 40 is known caused by measuring resistor 24
Other voltage drop identifies.
Therefore, according to the magnitude of load current 18 and its time graph and the temperature of measuring resistor 24, according to applicable
In the correspondence battery parameter of these boundary conditions --- in the present embodiment, according to temperature or voltage drop and use temperature or electricity
At least one correction factor of pressure drop identification --- to select to be better adapted to identify the correspondence of one or more correction factors
Battery parameter.
If there is these three above-mentioned conditions and if according in measuring resistor 24 voltage or voltage drop
It identifies correction factor, is then also closed second switch 66, in this way, it is single that the correction factor of output is output to assessment
Member 37.Therefore, existing temperature or Temperature Distribution or temperature/correction while adjustable or calibration is for measuring resistor 24
The stored correction factor of property curve, such as so as to for due to measuring resistance caused by aging or the influence of other environment
The resistance variations of device 24 adjust stored correction factor.Therefore, the identification of the correction factor carried out subsequently through temperature is with bright
Aobvious more accurate mode carries out.
Battery sensor shown in Fig. 2 and above-mentioned battery sensor the difference is that, provide two measurement resistance
Device 24a, 24b and with the two measuring resistors associated corresponding voltage check device 26a, 26b.
Corresponding each measuring resistor 24a, 24b of temperature sensor 36a, 36b is associated, the connection of these temperature sensors
To public temperature-measuring module 34.
The voltage drop for using voltage check device 26a, 26b to detect is added in circuit 68 and is output to first and is compared
Circuit 62a, the second comparison circuit 62b and assessment device 60.Therefore, using according to each electricity at measuring resistor 24a, 24b
The total voltage of pressure drop identification drops to carry out compared with first threshold 64a and second threshold 64b.
In addition, in other circuit 70, the difference that is formed between detected voltage drop is simultaneously output to circuit 56.
It is also bent by the voltage drop in measuring resistor 24a, 24b, its time in the case where battery sensor 10
Line and temperature select battery parameter compared with corresponding threshold value 64a, 64b, 64c, are used for by the battery parameter to identify
The correction factor of load current identification.
It can also identify multiple correction factors, according to battery parameter to improve the accurate of the identification to load current 18
Degree.
Further, it is also possible to specifically also pass through determination using the other methods of one or more correction factors for identification
Other battery parameters.
Which only need to predefine using which of the battery parameter that can be detected by battery sensor, and want at
It asks down and allows to more accurately identify at least one correction factor or more accurately identify load current.Depending on being respectively present
Battery parameter or its value and time graph, can choose the correspondence battery parameter for determining at least one correction factor, should
At least one correction factor is for allowing to most be accurately determined load current 18.
Claims (16)
1. the method for load current (18) of the one kind for identifying battery using battery sensor (10), wherein the battery passes
Sensor has at least one measuring resistor (24,24a, 24b), and is designed to detect at least one measuring resistor
The voltage drop at the both ends (24,24a, 24b) simultaneously identifies the load current (18) according to the voltage drop, wherein the battery sensor
(10) have for detect in each case at least one battery parameter at least two detection devices (26,26a, 26b,
34), this method has follow steps:
A) at least two battery parameter and these batteries are detected using at least two detection device (26,26a, 26b, 34)
The time graph of parameter,
B) it is determined according to the detected time graph of detected battery parameter and/or detected battery parameter
At least one time graph of at least one parameter and/or one of these battery parameters in these battery parameters, to determine
Correction factor,
C) using this battery parameter selected by least one and/or this at least one selected by battery parameter time graph come identify to
A few correction factor,
D) according to the voltage drop and at least one correction factor at least detected at the both ends measuring resistor (24,24a, 24b)
To determine the load current (18).
2. the method as described in claim 1, which is characterized in that at least one battery parameter include the battery temperature and/or
The temperature of the battery sensor (10), especially at least one measuring resistor (24,24a, 24b).
3. method according to claim 2, which is characterized in that identify at least one correction factor using at least one temperature
Correlation between be previously identified including basis, temperature and the correction factor, in particular according to temperature/correction factor characteristic curve
To select correction factor.
4. the method as described in one of above claim, which is characterized in that at least one battery parameter is at least one survey
Measure the voltage drop at the both ends resistor (24,24a, 24b).
5. method as claimed in claim 4, which is characterized in that the identification at least one of includes the following steps:
The reference current (40) of restriction is applied at least one measuring resistor (24,24a, 24b),
Identify voltage drop of the reference current (40) at least one measuring resistor (24,24a, 24b),
The school is identified according to voltage drop of the reference current (40) at least one measuring resistor (24,24a, 24b)
Positive divisor.
6. method as claimed in claim 5, which is characterized in that load current (18) is applied at least one the measurement resistance
Device (24,24a, 24b), and identify the load current (18) and the reference current (40) at least one measuring resistor
Voltage drop on (24,24a, 24b).
7. method as claimed in claim 4, which is characterized in that when there is following situations, select the measuring resistor (24,
24a, 24b) both ends at least one voltage drop as determining the battery parameter of the correction factor:
Threshold value (64c) according to the change rate of the time graph of at least one temperature identification lower than restriction,
The change rate identified according to the time graph of at least one voltage drop at the both ends measuring resistor (24,24a, 24b) is low
In the threshold value (64b) of restriction, and
The voltage drop at least one both ends measuring resistor (24,24a, 24b) is lower than the threshold value (64a) limited.
8. method as claimed in claim 5, which is characterized in that when there is following situations, select the measuring resistor (24,
24a, 24b) both ends at least one voltage drop as determining the battery parameter of the correction factor:
Threshold value (64c) according to the change rate of the time graph of at least one temperature identification lower than restriction,
The change rate identified according to the time graph of at least one voltage drop at the both ends measuring resistor (24,24a, 24b) is low
In the threshold value (64b) of restriction, and
The voltage drop at least one both ends measuring resistor (24,24a, 24b) is lower than the threshold value (64a) limited.
9. method as claimed in claim 6, which is characterized in that when there is following situations, select the measuring resistor (24,
24a, 24b) both ends at least one voltage drop as determining the battery parameter of the correction factor:
Threshold value (64c) according to the change rate of the time graph of at least one temperature identification lower than restriction,
The change rate identified according to the time graph of at least one voltage drop at the both ends measuring resistor (24,24a, 24b) is low
In the threshold value (64b) of restriction, and
The voltage drop at least one both ends measuring resistor (24,24a, 24b) is lower than the threshold value (64a) limited.
10. the method as described in one of claim 7 to 9, which is characterized in that identify that the temperature of the battery and/or the battery pass
The temperature of sensor (10), especially at least one measuring resistor (24,24a, 24b), and use identified temperature and work as
According at least one measurement as battery parameter when the change rate of the temperature is lower than the limiting value and/or the constant temperature limited
The both ends resistor (24,24a, 24b) voltage drop identification at least one correction factor come adjust this is previously identified, temperature with
Correlation between at least one correction factor especially adjusts the temperature/correction factor characteristic curve.
11. method as claimed in claim 10, which is characterized in that
When there is following situations, select at least one temperature as determining the battery parameter of the correction factor:
Threshold value (64c) according to the change rate of the time graph of at least one temperature identification not less than restriction,
Not according to the change rate of the time graph of at least one voltage drop at the both ends measuring resistor (24,24a, 24b) identification
Lower than the threshold value (64b) of restriction, or
The voltage drop at least one both ends measuring resistor (24,24a, 24b) is not less than the threshold value (64a) limited.
12. a kind of battery sensor (10) of the load current (18) for determining battery, wherein the battery sensor has extremely
A few measuring resistor (24,24a, 24b), and be designed to detect at least one measuring resistor (24,24a, 24b)
The voltage drop at both ends simultaneously identifies load current (18) according to the voltage drop, wherein the battery sensor (10) have for
At least two detection devices (26,26a, 26b, 34) of at least one battery parameter are detected in respective situation and for according to extremely
A few battery parameter identifies the assessment device of at least one correction factor, wherein especially using as the above claim it
Method described in one identifies the load current (18).
13. battery sensor as claimed in claim 12, which is characterized in that at least one detection device has temperature sensor
(36a, 36b), the temperature sensor be used for detect the battery temperature and/or the battery sensor (10), especially this at least one
The temperature of a measuring resistor (24,24a, 24b).
14. the battery sensor as described in any one of claim 12 and 13, which is characterized in that at least one detection device packet
Include the voltage drop for detecting at least one both ends measuring resistor (24,24a, 24b) voltage check device (26,26a,
26b)。
15. the battery sensor as described in any one of claim 12 and 13, which is characterized in that provide reference current circuit
(38) the reference current (40) limited is applied at least one measuring resistor (24,24a, 24b).
16. battery sensor as claimed in claim 14, which is characterized in that provide reference current circuit (38) to limit
Reference current (40) is applied at least one measuring resistor (24,24a, 24b).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102017223535.7 | 2017-12-21 | ||
| DE102017223535.7A DE102017223535A1 (en) | 2017-12-21 | 2017-12-21 | Method and battery sensor for determining a load current |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109946510A true CN109946510A (en) | 2019-06-28 |
| CN109946510B CN109946510B (en) | 2022-04-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811529077.2A Active CN109946510B (en) | 2017-12-21 | 2018-12-13 | Method for detecting load current and battery sensor |
Country Status (3)
| Country | Link |
|---|---|
| KR (1) | KR102579521B1 (en) |
| CN (1) | CN109946510B (en) |
| DE (1) | DE102017223535A1 (en) |
Cited By (3)
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|---|---|---|---|---|
| CN112834974A (en) * | 2019-11-22 | 2021-05-25 | 大陆汽车有限公司 | Method for testing a battery sensor, and battery sensor |
| CN112955763A (en) * | 2020-01-15 | 2021-06-11 | 深圳市大疆创新科技有限公司 | Battery parameter determination method, device and storage medium |
| CN116018505A (en) * | 2020-08-26 | 2023-04-25 | 西门子股份公司 | Method for determining cooling body contamination with the aid of artificial intelligence |
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| DE102018217625A1 (en) * | 2018-10-15 | 2020-04-16 | Continental Automotive Gmbh | Method for operating a battery sensor and battery sensor |
| DE102019213885A1 (en) * | 2019-09-11 | 2021-03-11 | Continental Automotive Gmbh | Battery sensor |
| DE102019218823A1 (en) * | 2019-12-04 | 2021-06-10 | Robert Bosch Gmbh | Method and device for checking the functionality of a resistor of a battery system serving as a system resistor |
| DE102023101216A1 (en) * | 2023-01-19 | 2024-07-25 | Bayerische Motoren Werke Aktiengesellschaft | Measuring chip for temperature-dependent voltage value correction for a current measurement as well as appropriately configured measuring device, battery and motor vehicle |
| DE102023129199B3 (en) | 2023-10-24 | 2025-02-20 | Isabellenhütte Heusler Gmbh & Co. Kg | current measuring device and associated operating procedure |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR102579521B1 (en) | 2023-09-15 |
| DE102017223535A1 (en) | 2019-06-27 |
| CN109946510B (en) | 2022-04-12 |
| KR20190075812A (en) | 2019-07-01 |
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