CN107356799A - A kind of electric current delay method of sampling - Google Patents
A kind of electric current delay method of sampling Download PDFInfo
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- CN107356799A CN107356799A CN201710417486.2A CN201710417486A CN107356799A CN 107356799 A CN107356799 A CN 107356799A CN 201710417486 A CN201710417486 A CN 201710417486A CN 107356799 A CN107356799 A CN 107356799A
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- current
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- delay
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- 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
- G01R19/003—Measuring mean values of current or voltage during a given time interval
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- 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
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- General Physics & Mathematics (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
A kind of electric current delay method of sampling, comprises the following steps：S01, the cycle T for obtaining current signal to be sampled；S02, sampling number N of the battery management system in cycle T is set；S03, computation delay duration Tdelay=cycle T/sampling number N, battery management system treat sampled current signals and carry out periodically delay sampling, obtain N number of current sample point A1、A2、A3、……、An；S04, utilize mean filter method calculating current average value Iavg.This technical scheme utilizes simple delay calculating method, the high-precision of limited battery management system resource property performance period can be made to sample current signal, it is not necessary to increase extra hardware circuit and make it that current sample is more accurate.
Description
Technical field
The present invention relates to current sample field, more particularly to a kind of electric current delay method of sampling.
Background technology
In the course of the work, the actual operating current waveform of inverter is mechanical periodicity to existing family's energy storage device,
For battery management system, inverter can produce ripple to the power supply circuit of battery management system, may result in cell tube
In collecting work current waveform, the operating current of battery management system collection can be compared reason system with the actual value of operating current
Produce certain error.
Traditional battery management system, using the method for mean filter, original is replaced with average after operating current has been gathered
Each current sampling data at time point.For example, battery management system gathers N number of current sample point A in operating current cycle T1、
A2、A3、……、An, mean filter calculates the average current value I in cycle Tavg=(A1+A2+A3+……+An)/N, average electricity
Flow valuve I is the current value in period T.But mean filter method still has the defects of certain, mean filter is to utilize week
The current sample point of collection calculates average current value I in phase T, because the acquisition rate of battery management system is limited, if electric
For the current sample point of pond management system collection less than a cycle T, the current average I that mean filter calculates there is mistake
Difference.When situation is serious, current average IavgWith electric current actual value IrealExisting error will be very big, result in battery management
System can not estimate the current average I in recognition cycle Tavg, have impact on the unstability of battery management system.
The content of the invention
The purpose of the present invention is to overcome weak point of the prior art, there is provided a kind of electric current delay method of sampling.
The purpose of the present invention is achieved through the following technical solutions：
A kind of electric current delay method of sampling, comprises the following steps：
S01, the cycle T for obtaining current signal to be sampled；
S02, sampling number N of the battery management system in cycle T is set；
S03, computation delay duration Tdelay=cycle T/sampling number N, battery management system are treated sampled current signals and entered
Row periodically delay sampling, obtains N number of current sample point A1、A2、A3、……、An；
S04, utilize mean filter method calculating current average value Iavg。
In one of the embodiments, current average I in the step S04avg=(A1+A2+A3+……+An)/N。
In one of the embodiments, the step S04 is specially：
Obtain the maximum current sampled point I in N number of current sample pointmaxWith minimum current sampled point Imin, calculating current puts down
Average Iavg=(A1+A2+A3+……+An-Amax-Amin)/(N-2)。
In one of the embodiments, the step S01 is specially：
Current signal to be sampled is inputted to oscillograph, the cycle T of current signal to be sampled is obtained using oscillograph.
This technical scheme has following beneficial effect compared to prior art：
Using simple delay calculating method, the high accuracy of limited battery management system resource property performance period can be made
To current signal sample, it is not necessary to increase extra hardware circuit and make it that current sample is more accurate.
Brief description of the drawings
Fig. 1 is the electric current delay method of sampling schematic flow sheet in the present embodiment；
Fig. 2 is the oscillogram of the oscillograph in the present embodiment.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give the better embodiment of the present invention.But the present invention can realize in many different forms, however it is not limited to herein
Described embodiment.On the contrary, the purpose for providing these embodiments is to make to understand more the disclosure
Add thorough and comprehensive.
It should be noted that when element is referred to as " being fixed on " another element, it can be directly on another element
Or there may also be element placed in the middle.When an element is considered as " connection " another element, it can be directly connected to
To another element or it may be simultaneously present centering elements.Term as used herein " vertical ", " horizontal ", " left side ",
For illustrative purposes only, it is unique embodiment to be not offered as " right side " and similar statement.
Unless otherwise defined, all of technologies and scientific terms used here by the article is with belonging to technical field of the invention
The implication that technical staff is generally understood that is identical.Term used in the description of the invention herein is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " and/or " include one or more
The arbitrary and all combination of related Listed Items.
It is as shown in Figure 1 electric current delay method of sampling schematic flow sheet, comprises the following steps：
S01, the cycle T for obtaining current signal to be sampled；
S02, sampling number N of the battery management system in cycle T is set；
S03, computation delay duration Tdelay=cycle T/sampling number N, battery management system are treated sampled current signals and entered
Row periodically delay sampling, obtains N number of current sample point A1、A2、A3、……、An；
S04, utilize mean filter method calculating current average value Iavg。
Further, current average I described in the step S04avg=(A1+A2+A3+……+An)/N。
Further, the step S04 is specially：
Obtain the maximum current sampled point I in N number of current sample pointmaxWith minimum current sampled point Imin, calculating current puts down
Average Iavg=(A1+A2+A3+……+An-Amax-Amin)/(N-2)。
Further, the step S01 is specially：
Current signal to be sampled is inputted to oscillograph, the cycle T of current signal to be sampled is obtained using oscillograph.
Embodiment：
Current signal to be sampled is inputted to oscillograph, the cycle T of current signal to be sampled is obtained using oscillograph, is set
Battery management system the sampling number N in cycle T, computation delay duration Tdelay=cycle T/sampling number N, battery management system
System treats sampled current signals and carries out periodically delay sampling, obtains N number of current sample point A1、A2、A3、……、An, specific stream
Journey is that battery management system gathers first current acquisition point A in current signal a cycle T to be sampled1Afterwards, delay duration
TdelayGather second current acquisition point A again afterwards2, by that analogy, N number of current acquisition point is obtained, is delayed what is sampled using electric current
Mode, N number of current acquisition point can be caused to entirely fall in a cycle T of current signal to be sampled.
It should be noted that the sampled point according to the cycle T of current signal to be sampled and battery management system in cycle T
Number N computation delay durations Tdelay.Purpose is that in the sampling process of reality, the ability in sampling of battery management system is limited
, in the case where not increasing extra hardware Acquisition Circuit, if the current sample point in cycle T can not entirely fall in
In a cycle T, then it will cause the current average I in battery management system estimation cycle TavgInaccuracy, so as to influence electricity
The stability of pond management system.
As shown in Fig. 2 curve A is being adopted in no any filtering method of application in battery management system practical work process
The current signal waveform figure to be sampled collected, line segment D are the electric current to be sampled that ideally battery management system collects
The oscillogram of signal, line segment B are that battery management system handles to obtain current signal to be sampled using traditional mean filter method
Obtained oscillogram, line segment C are the current signal to be sampled that battery management system handles to obtain using this technical scheme.Can be with
Find out, the current waveform figure to be sampled more close electricity to be sampled ideally obtained using the method for this technical scheme
Flow signal waveforms.
It is emphasized that to obtain more accurate current signal waveform figure to be sampled, sample rate current can treated
After signal enters line delay sampling, N number of current sample point is handled using the method for smooth median filter, i.e., in N number of current sample point
In, find the maximum current sample point I in N number of current sample pointmaxWith minimum current sampled point Imin, remove maximum current and adopt
Sampling point ImaxWith minimum current sampled point Imin, calculating current average value Iavg=(A1+A2+A3+……+An-Amax-Amin)/(N-
2)。
Embodiment described above only expresses the several embodiments of the present invention, and its description is more specific and detailed, but simultaneously
Can not therefore it be construed as limiting the scope of the patent.It should be pointed out that come for one of ordinary skill in the art
Say, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the protection of the present invention
Scope.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (4)
- The method of sampling 1. a kind of electric current is delayed, it is characterised in that comprise the following steps：S01, the cycle T for obtaining current signal to be sampled；S02, sampling number N of the battery management system in cycle T is set；S03, computation delay duration Tdelay=cycle T/sampling number N, battery management system treat sampled current signals and carry out week The delay sampling of phase property, obtains N number of current sample point A1、A2、A3、……、An；S04, utilize mean filter method calculating current average value Iavg。
- The method of sampling 2. electric current according to claim 1 is delayed, it is characterised in that electric current is put down described in the step S04 Average Iavg=(A1+A2+A3+……+An)/N。
- The method of sampling 3. electric current according to claim 1 is delayed, it is characterised in that the step S04 is specially：Obtain the maximum current sampled point I in N number of current sample pointmaxWith minimum current sampled point Imin, calculating current average value Iavg=(A1+A2+A3+……+An-Amax-Amin)/(N-2)。
- The method of sampling 4. electric current according to claim 1 is delayed, it is characterised in that the step S01 is specially：Current signal to be sampled is inputted to oscillograph, the cycle T of current signal to be sampled is obtained using oscillograph.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108896927A (en) * | 2018-07-20 | 2018-11-27 | 深圳市道通智能航空技术有限公司 | Evaluation method, device, battery and the aircraft of aircraft residual non-uniformity |
| CN111610359A (en) * | 2020-05-29 | 2020-09-01 | 上海挚达科技发展有限公司 | Filtering method for controlling voltage acquisition of guide circuit by charging pile |
| WO2024011709A1 (en) * | 2022-07-14 | 2024-01-18 | 广州地铁集团有限公司 | Motor current sampling method, frequency converter, terminal device, and storage medium |
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| CN108896927A (en) * | 2018-07-20 | 2018-11-27 | 深圳市道通智能航空技术有限公司 | Evaluation method, device, battery and the aircraft of aircraft residual non-uniformity |
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Application publication date: 20171117 |