CN112763781A - Current sampling method for new energy automobile - Google Patents
Current sampling method for new energy automobile Download PDFInfo
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- CN112763781A CN112763781A CN202011503669.4A CN202011503669A CN112763781A CN 112763781 A CN112763781 A CN 112763781A CN 202011503669 A CN202011503669 A CN 202011503669A CN 112763781 A CN112763781 A CN 112763781A
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- 238000005070 sampling Methods 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 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
- G01R15/20—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices
- G01R15/202—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks using galvano-magnetic devices, e.g. Hall-effect devices, i.e. measuring a magnetic field via the interaction between a current and a magnetic field, e.g. magneto resistive or Hall effect devices using Hall-effect devices
-
- 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
- G01R19/25—Arrangements for measuring currents or voltages or for indicating presence or sign thereof using digital measurement techniques
Abstract
The invention relates to a new energy automobile current sampling method, which comprises the following steps: step 1: placing the Hall at the positive end of the battery, and providing power supply by 5744P, and step 2: the shunt is connected in series at the negative end of the battery, and the step 3: considering that both the hall and the shunt have errors, when comparing the current collected by the hall and the current collected by the shunt, the respective errors need to be included, and step 4: obtaining an initial Kalman coefficient K; and 5: the variance P and the coefficient K are updated.
Description
Technical Field
The invention relates to a sampling method, in particular to a new energy automobile current sampling method, and belongs to the technical field of function safety detection of new energy automobiles.
Background
Current new energy automobile all has the function of current sampling. Current is typically collected using a hall current sensor or shunt. The Hall current sensor scheme is as follows: a high-voltage wire of the battery penetrates through the middle of a hole of the Hall current sensor, a voltage value is output through the Hall principle, a formula of the voltage value and a passing current value is obtained by inquiring a Hall sensor manual, and the passing current value is obtained through calculation. The scheme of the flow divider is as follows: and connecting the shunt in series to a high-voltage loop of the battery, collecting voltage values passing through two ends of the shunt, and removing the resistance value of the shunt by using the obtained voltage difference value to obtain a passing current value. In any way, the precision of the collected current is limited; in addition, due to the popularization of functional safety, clear requirements are provided for overcurrent faults in the charging and discharging processes of the new energy automobile at the present stage, and the traditional current sampling function cannot meet the functional safety requirements; in order to solve the problems, a novel current sampling method is provided, and the method not only meets the international safety standard: ISO 26262, and obtaining the optimal current through data processing.
Disclosure of Invention
The invention provides a new energy automobile current sampling method aiming at the problems in the prior art, and the technical scheme meets the requirement of functional safety on current sampling and provides the optimal current for calculating the SOC and the SOP.
In order to achieve the purpose, the technical scheme of the invention is that the current sampling method of the new energy automobile comprises the following steps:
step 1: placing a Hall at the positive electrode end of a battery, supplying power by 5744P, when current passes through the Hall, the Hall can generate a voltage value which is acquired by an AD port of 5744P, and obtaining a calculation formula of a current value by inquiring a product manual of the Hall, so that a passing current value is obtained, wherein the sampling error of the Hall is u 1;
step 2: the shunt is connected in series at the negative electrode end of the battery, when current passes through the shunt, a voltage value is generated at the front end and the rear end of the shunt respectively, the two voltage values are acquired by the AD port of 5744P, a calculation formula of the current value is obtained by inquiring a product manual of the shunt, and therefore the passing current value is obtained, and the sampling error of the shunt is u 2;
and step 3: considering that both the Hall and the shunt have errors, the respective errors need to be included when the current collected by the Hall and the current collected by the shunt are compared, and when the error values of the two currents have intersection, the current values collected by the Hall and the shunt are considered to be effective values;
and 4, step 4: obtaining an initial Kalman coefficient K;
the variance of the Hall sampling error is P ═ u1^2, the variance of the shunt sampling error is R ═ u2^2, the initial Kalman coefficient is obtained and is K ═ P/(P + R) ═ u2^2/(u1^2+ u2^2), and the non-0 current value collected for the first time is assumed to be: detecting a current value Ia by the Hall and detecting a current value Ib by the shunt; thus, the current value I after the primary processing is obtained as Ib + K (u1-u 2); storing K1 ═ R/(P + R) ═ u1^2/(u1^2+ u2^2), and performing step 5 by using a Hall after the shunt fails;
and 5: p1 at the next time point obtains updated P1 ═ P (1-K) ×, and K1 at the next time point also obtains updated K1 ═ P1/(P1+ R), and assuming that the diverter detection current value I2b at this time point obtains a processed current value I2 ═ I2b + K1 ═ u1-u 2;
step 6: recursion is achieved by the above.
Compared with the prior art, the invention has the following advantages: 1) due to the existence of the Hall and the shunt, the combined sampling scheme can meet the functional safety requirement; 2) in the scheme, a Kalman filtering algorithm is used, and the obtained current is also an optimal value; 3) the algorithm only needs to acquire data currently, the requirement on storage is not large, the algorithm can recur, and the implementation is simple; 4) the circuit and the tool which need to be built in the implementation scheme are very simple and easy to operate.
Drawings
FIG. 1 is a block diagram of the system of the present invention;
FIG. 2 is a flow chart of the present invention.
The specific implementation mode is as follows:
for the purpose of enhancing an understanding of the present invention, the present embodiment will be described in detail below with reference to the accompanying drawings.
Example 1: referring to fig. 1, a new energy automobile current sampling method includes the following steps:
step 1: placing a Hall at the positive electrode end of a battery, supplying power by 5744P, when current passes through the Hall, the Hall can generate a voltage value which is acquired by an AD port of 5744P, and obtaining a calculation formula of a current value by inquiring a product manual of the Hall, so that a passing current value is obtained, wherein the sampling error of the Hall is u 1;
step 2: the shunt is connected in series at the negative electrode end of the battery, when current passes through the shunt, a voltage value is generated at the front end and the rear end of the shunt respectively, the two voltage values are acquired by the AD port of 5744P, a calculation formula of the current value is obtained by inquiring a product manual of the shunt, and therefore the passing current value is obtained, and the sampling error of the shunt is u 2;
and step 3: considering that both the Hall and the shunt have errors, the respective errors need to be included when the current collected by the Hall and the current collected by the shunt are compared, and when the error values of the two currents have intersection, the current values collected by the Hall and the shunt are considered to be effective values;
and 4, step 4: obtaining an initial Kalman coefficient K;
the variance of the Hall sampling error is P ═ u1^2, the variance of the shunt sampling error is R ═ u2^2, the initial Kalman coefficient is obtained and is K ═ P/(P + R) ═ u2^2/(u1^2+ u2^2), and the non-0 current value collected for the first time is assumed to be: detecting a current value Ia by the Hall and detecting a current value Ib by the shunt; thus, the current value I after the primary processing is obtained as Ib + K (u1-u 2); storing K1 ═ R/(P + R) ═ u1^2/(u1^2+ u2^2), and performing step 5 by using a Hall after the shunt fails;
and 5: p1 at the next time point obtains updated P1 ═ P (1-K) ×, and K1 at the next time point also obtains updated K1 ═ P1/(P1+ R), and assuming that the diverter detection current value I2b at this time point obtains a processed current value I2 ═ I2b + K1 ═ u1-u 2;
step 6: recursion is achieved by the above.
It should be noted that the above-mentioned embodiments are not intended to limit the scope of the present invention, and all equivalent modifications and substitutions based on the above-mentioned technical solutions are within the scope of the present invention as defined in the claims.
Claims (3)
1. The new energy automobile current sampling method is characterized by comprising the following steps:
step 1: acquiring a sampling error u1 of the Hall;
step 2: acquiring the sampling error of the flow divider as u 2;
and step 3: considering that both the Hall and the shunt have errors, the respective errors need to be included when the current collected by the Hall and the current collected by the shunt are compared, and when the error values of the two currents have intersection, the current values collected by the Hall and the shunt are considered to be effective values;
and 4, step 4: obtaining an initial Kalman coefficient K, specifically:
the variance of the Hall sampling error is P ═ u1^2, the variance of the shunt sampling error is R ═ u2^2, the initial Kalman coefficient is obtained and is K ═ P/(P + R) ═ u2^2/(u1^2+ u2^2), and the non-0 current value collected for the first time is assumed to be: detecting a current value Ia by the Hall and detecting a current value Ib by the shunt; thus, the current value I after the primary processing is obtained as Ib + K (u1-u 2); storing K1 ═ R/(P + R) ═ u1^2/(u1^2+ u2^2), and performing step 5 by using a Hall after the shunt fails;
and 5: p1 at the next time point obtains updated P1 ═ P (1-K) ×, and K1 at the next time point also obtains updated K1 ═ P1/(P1+ R), and assuming that the diverter detection current value I2b at this time point obtains a processed current value I2 ═ I2b + K1 ═ u1-u 2;
step 6: recursion is achieved by the above.
2. The new energy automobile current sampling method according to claim 1, wherein the step 1: acquiring a sampling error u1 of the Hall; specifically, the Hall is placed at the positive electrode end of the battery, a power supply is provided by 5744P, when current passes through the Hall, the Hall can generate a voltage value, the voltage value is collected by an AD port of 5744P, a calculation formula of a current value is obtained by inquiring a product manual of the Hall, so that a passing current value is obtained, and the sampling error of the Hall is u 1.
3. The new energy automobile current sampling method according to claim 1, wherein the step 2: acquiring the sampling error of the flow divider as u 2; specifically, the shunt is connected in series at the negative electrode end of the battery, when current passes through the shunt, the front end and the rear end of the shunt respectively generate a voltage value, the two voltage values are acquired by the AD port of 5744P, a calculation formula of a current value is obtained by inquiring a product manual of the shunt, and therefore the passing current value is obtained, and the sampling error of the shunt is u 2.
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|---|---|---|---|
| CN202011503669.4A CN112763781A (en) | 2020-12-17 | 2020-12-17 | Current sampling method for new energy automobile |
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| CN202011503669.4A CN112763781A (en) | 2020-12-17 | 2020-12-17 | Current sampling method for new energy automobile |
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|---|---|---|---|---|
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2020
- 2020-12-17 CN CN202011503669.4A patent/CN112763781A/en active Pending
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